Manufacturing method of helical spring by winding, and spring-winding machine

FIELD: machine building.

SUBSTANCE: method involves supply of wire and its shaping by means of forming mechanism tools. The required nominal geometrical parameters of helical spring are specified. Actual position of the chosen element of helical spring structure relative to reference element is measured at least at one instant of time between beginning and end of helical spring production process in measurement zone that is located at final distance from forming mechanism as to length of helical spring. The above distance is shorter than total length of finished helical spring. The measured actual position of the structure element is compared by means of CNC programme to its nominal position for the specified instant of time in order to determine the current difference of positions, which represents difference between actual position and nominal position at instant of time when the measurement was made. Depending on difference of positions, control of tool (130) of step mechanism included in the forming mechanism is performed.

EFFECT: manufacture of a series of long helical springs with inconsiderable variation of total length.

15 cl, 6 dwg

 

The technical field to which the invention relates.

The present invention relates to a method of manufacturing helical springs by spring winding through a spring-coiling machines with numerical control (CNC), the appropriate restrictive part of claim 1 of the claims, and spring-coiling machine, which is suitable for implementing this method.

The level of technology

The coil springs are machine elements that are required in large quantities and various forms for use in numerous fields. Helical springs, which are also referred to as coil springs torsion, usually made of spring wire and are in the form of tension springs or compression springs, depending on the load applied thereto during use. Compression spring, in particular the supporting springs are required in large quantities for vehicle Assembly. The characteristics of springs among other things can be affected areas with different angles of turns (step) or with different profile rise. For example, in the case of spring compression on the spring has a middle portion of greater or lesser length with a constant angle (the section with constant pitch), to which both ends of the spring abut the contact points with the elevation angle, which decreases towards the ends. In the case of cylindric the ski coil springs spring diameter is kept constant along the length of the spring, but it can also vary in length, for example in the case of conical or barrel-shaped coil springs. In addition, the total length (unloaded) of the spring may be varied within wide limits depending on the purpose of the spring.

Currently, the coil springs are made usually wound on a spring-coiling machines (machines with CNC. In this case, by feeding mechanism under control of the program numerical control is the feed wire (spring wire) forming mechanism spring-coiling machine and forming tools forming mechanism to receive the coil springs. These tools typically include one or more fingers winding of the changed situation, to be able to fix the diameter of the coils of the spring to vary the diameter of the coils, and one or more instruments stepper mechanism that provides local step of the coils of the spring at each stage of the manufacturing process.

Spring-coiling machine, as a rule, rely on high-performance production of large quantities of springs with a specific geometry (nominal geometry) and a very narrow tolerance. Functionally important geometrical parameters, inter alia, include the total length of the finished coil spring in the unloaded state the AI. Total length, among other things, defines the installation size of the spring and the spring force.

In practice, to meet the stringent quality requirements, for example, in the automotive industry, usually measured specific geometric dimensions of the spring, such as diameter, length, and/or step or profile of the step spring after it was made, and depending on the measurement results are automatically sorted ready for the spring to fit (dimensions are in tolerance) and bad (dimensions do not fall within the tolerance), and possibly even on additional categories. This procedure is very inefficient, especially in the case of long springs, as in the case of long springs on each of them consumes a relatively large piece of wire, which is necessary to remove waste, if it is determined that the finished spring does not fit in the tolerance.

It was also suggested by means of suitable measuring instruments during manufacture to control the diameter, length and pitch of the spring and in the event of any deviations from acceptable limits to change the parameters of production, so that the geometry of the spring remained within the tolerance.

In German patent 10345445 B4 disclosed spring-coiling machine, which has a built-in measuring system with a video camera aimed at the area of spring-coiling machine, where achinese the formation of springs. The image processing system, which is connected with a video camera and contains appropriate analysis algorithms, allows during the manufacture of the spring to check its length, diameter and pitch, and is configured to change the geometric parameters of the spring due to feedback from a technological tool that can be rebuilt through the engine during the manufacture of the spring. The patent described the analysis algorithm to determine the current diameter of the spring.

Disclosure of inventions

The invention arose from the problem of optimizing method and machine, typical for solving problems of the type that in the manufacture of relatively long coil springs these springs can be had with high reliability to perform under strict geometrical tolerances of the wire materials of different quality. In particular, one task is to make possible the production of a long coil springs with low variation in total length and low frequency rejection.

These problems are solved by the method of manufacturing helical springs by spring winding, characterized in claim 1 of the claims, and spring-coiling machine, characterized in item 12 of the claims. Preferred embodiments of the method and machine described in the dependent claims of the Britania. The wording of all claims through links included in the content of the present description.

According to the method, first determine the required nominal geometrical parameters to be manufacturing the coil spring and the program of the numerical control, which is suitable for receiving data nominal geometrical parameters. Thus define the sequence of coordinated operational movements relative to the axis spring-coiling machine, which must be performed during manufacture of the spring.

During manufacture of the coil springs measure the actual position of the selected element of the structure of the spring with respect to some reference (reference) element. This measurement allows you to determine the actual distance between the selected structure element and the reference element.

The measurement is performed in the time between the beginning and the end of the manufacture of the coil spring, i.e. during the working movements of the spring-coiling machine, intended for the manufacture of springs. That is, at the time when the measurement made is only part of the spring. In this case, the selected structure element is in the measurement area, which in turn is located at a definite distance from the molding IU is aNISM in the direction of the length of the coil spring. This distance is less than the total length of the finished helical springs, more precisely, it is less than the total length, which follows from the nominal geometry data. The current difference of the provisions, which represents the difference between the actual position and the nominal position of the element patterns in the time dimension, determined by comparing the actual position of the structure element from its nominal position at the time of measurement. Then, depending on the difference of the provisions govern the position of the at least one instrument affecting step helical springs, in order to bring the actual to the nominal position.

If the actual position corresponds to the nominal, no control actions do not. On the contrary, if there is a significant mismatch (difference of provisions), then produce a change step of manufactured springs at the time of its formation by changing the tool position of the stepping mechanism and/or other instrument, which affects the step (for example, winding finger, which can be rotated and/or tilted in a controlled way), so that the next measurement it was possible to expect the reduction step of the spring. Thus, on the basis of these measurements, operate the instant value of the step spring. Setoy purpose it is preferable to control only a stepping mechanism with open or closed loop feedback.

Because the measurement is at a definite distance from the place of formation of the spring forming mechanism, this measurement allows to determine the accumulated error of the length of the spring between the forming mechanism and area measurements. Since, in addition, the distance between the measurement area and the molding mechanism is less than the total length of the finished helical springs, the measurement can be performed early enough in comparison with the total production time of the coil spring, so that the control action, which can be made on the basis of the measurement data, can be used to correct any incorrect settings during the process of forming the spring, so that upon completion of the manufacturing process, the total length of the coil spring was found to be within tolerance.

The distance between the measurement area and the molding mechanism it is desirable to align with the overall length of the finished helical spring, so that the specified distance was 5-70% of the total length, in particular 10-50% of the total length. If you choose a distance corresponding to the minimum limit specified interval of preferred values, in the case of non-ideal conditions forming at the site of the spring can manage to accumulate length error, which is quite large compared to the measurement error of measure is measuring systems, to give a meaningful measurement results. If you choose a distance corresponding to the upper limit of the specified interval preferred values, it is still usually going to be enough time to for the account of one or more control actions to manage to manufacture a coil spring, which in the end will have a total length required.

Preferably, within the specified distances were one or more coils of the spring, whereby the measurement can be, for example, two, three, four, five, six or more coils from the place of formation of springs or from the location of the molding mechanism. Correct results can often be obtained at a distance of two or three turns, depending on the step.

In a preferred embodiment of the method the actual position is measured relative to the reference element fixedly mounted on the machine. Fiducial element fixedly mounted on the machine, is the element whose coordinates are known or can be determined relative to a fixed coordinate system of the machine. Because in this case, the reference element has coordinates that are defined in the coordinate system of the spring-coiling machine, this measurement is an absolute measurement. This allows, in particular, will perform the measurement with high accuracy.

On the other hand, the reference element can also serve as an element of the structure of the coil spring, in particular a section of a coil located relatively close to the forming mechanism, or contour plot turn. In this case, there is a relative measurement. To the area between the structural element that is selected for measurement, and the reference element had time to accumulate the error length is large enough to provide reliable measurements between these elements should be in a few turns, for example, two, three, four, five or more coils of the spring.

Measurements should preferably be in a contactless manner, in particular by optical means. For example, for this purpose you can use a measuring system based on the laser. For measurements it is preferable to use the camera with two-dimensional field of view (scope sight, grip area), and in the field of view of the camera to provide a measurement. Measuring system based on video cameras with powerful hardware and software image processing are produced industrially and can be used for this purpose. The camera should be mounted on the valve with the lowest possible vibration, while during operation of the fittings must be rigidly mounted on the frame spring-coiling machine. is the Amer preferably placed next to the guide or on the guide which are oriented along the spring, which allows to fix the camera at different distances from the forming mechanism, in order for springs with different geometry to set the camera at an optimal distance. It is possible to provide for the adjustment of the installation position vertical, so that, for example, it was possible to find the position of the camera in accordance with the diameter of the spring. The adjustment mechanism should also ensure that the slant of the camera relative to the spring axis, if required.

In some embodiments of the method, the reference point for measurements is on the edge of, for example, rectangular field of view of the camera, the coordinates in the coordinate system of the machine is known. In this case, the edge of the field of view forms a virtual fiducial element, moreover, it is preferable that this was a side edge of the field closest to the forming device. Then measure the actual position of the structure elements of the spring can be reduced to a simple measurement of distances in the field of view of the camera.

In another embodiment, a method that can be used by itself or in addition, provide physical reference element (reference body), which is fixedly mounted on the machine and is located in the field of view of the camera at some distance from the zone of measurement, while the quality is TBE point of reference when measuring the use of any element of the physical structure of the fixed element, for example a straight edge. Under this option, the way no vibration of the camera during the measurement may not affect the measurement accuracy, since vibration may not affect the apparent field of view of the camera the distance between the measured element patterns coil spring and a reference point on the physical reference element.

Found that when used for measurements of the 2D camera is particularly advantageous as measured element patterns coil spring to select a portion of the path of a coil spring which is in the field of view of the camera is present in the form of a more or less straight line and passes in a transverse direction relative to the spring axis, in particular at an angle of approximately 45° to 90° relative to the axis of the coil spring. This allows using simple algorithms for detecting the contour of the imaging system to accurately determine the actual position of the element patterns in the direction of the length of the spring. On the other hand, for example, you can have a measurement in place the outer edge of the coil springs, to determine the coordinate of the maximum distance (maximum coordinate) of this section coil axis of the coil spring and to determine the distance between a specified maximum coordinate and the reference element.

To target a way to manage the process of manufacturing springs nominal position of the element patterns of the spring in time, when the measurement must be known as accurately as possible. Preferably, the nominal position of the element patterns was known for each point in time of the manufacturing process of the spring, so that the nominal position at the moment of time, when measured, can be obtained directly from the appropriate program-time function. In the manufacture of coil springs, which have an area of constant pitch greater or lesser length, the measurement should preferably be started only when through the measurement area will be the area with the changing step that can be present in the spring. When performing measurements on the plot with spaced turns, you can use the fact that the nominal position of the selected element of the structure remains constant over a relatively long time, which implies the comparative ease of obtaining measured values and their analysis. In principle it is also possible measurements on the parts of the spring with the changing step. This usually leads to a situation where nominal position vary, i.e. time-shifted and then used as a baseline for comparison with the nominal value, which refers to the point in time when a reading is taken.

Typically, a fo the ATA nominal position of the element patterns in time, when measured, is obtained from the program-time function, which is determined prior to measurement for coordinates of the nominal position of the element patterns. Then for each time of measurement may be the only way determined the correct nominal value. Software-time function for the coordinates of the nominal position can be obtained by computer simulation. However, in General, it is possible and appropriate for the experimental determination of the coordinates for a relatively short time. In some embodiments, the method programmatically-time function for the coordinates of the nominal position of the element patterns are derived, so to speak, experimental trial manufacturing at least one control coil spring.

The phrase "program-temporary" function in this case is a function that correlates with a specific point of a program of numerical control. In this case, the achievement of a specific set of instructions numerical control (NC) corresponds to a specific software time or time within a sequence of program instructions. In this degree program times corresponds to the position in the sequence of instructions during the sequential steps of the program in% the SSE program execution. If, for example, to control the image recorded by the camera in a particular phase of the program execution requires a start signal, then this signal start may be initiated by a line of the program before a relevant point. Such signals directly tied in to the program to certain provisions of machine axes, such as machine axis wire feeder and/or machine axis position of the stepping mechanism. Time in program-time function corresponds to the position on the curve move one or more machine axes. Programmatically-time function gives the time (program time) within a program of numerical control, which is synchronous with the progress of manufacture of the spring. In this degree program-time function is a function of movement relative to the movements of the machine axes. In particular, program-temporary function also corresponds to a function of movement of the wire feeder.

In some processes, for example in the case of relatively short coil springs, can be quite a single measurement and a single control actions performed as follows after a specified dimension for receiving the coil spring with a sufficiently small error in length. In the case of relatively long coil springs during the manufacture of the spring smartiepants repeatedly in successive moments of time and with intervals between measurements, that gives the opportunity to observe the rate of change of geometrical parameters of the spring during its manufacture and, if necessary, to repeatedly perform control actions.

The number of measurements per unit of time is theoretically limited by the performance measurement systems for image capture and analysis. However, it is found that high frequency measurements, as a rule, not necessary and not advisable. In preferred embodiments of the method the time interval between adjacent successive moments of time when performed measurements agree with the wire feed speed so that the time interval between adjacent consecutive measurements was forming at least one coil spring, and preferably from one to two turns. This gives the opportunity to ensure that the accumulated error length is large enough to ensure reliable detection within the accuracy of the measuring system. This improves the reliability of the results of measurement and process control becomes more stable.

In the manufacture of plot coil spring with a constant step, it is preferable to perform multiple measurements. Under these conditions, the observed structure element springs within a certain time does not have to change their situation. During this time the nominal value used for comparison, remains constant.

If in the process of manufacturing area with constant step structure element is shifted to the molding mechanism, this indicates that the step of forming the spring is too small and can be properly adjusted. Conversely, the offset of the element patterns in the direction from the forming mechanism can be compensated by a reduction step.

In some embodiments, the method for the actual values to determine a moving average of the data set of consecutive measurements after a given number of measurements, in particular after each measurement. Based on the moving average value may be received accurate information regarding the effectiveness of the control actions. Course changes a moving average over time, it is preferable to display on the display device spring-coiling machine. From this, the operator can directly see whether the setpoint entered into the control device adequate for the effective management, so in the end stage of manufacture to receive the coil spring to the desired total length.

Can be done in various principles and control algorithms. In some embodiments, for each set of difference provisions op edalat weighted value difference and on the basis of the weighted difference change the position of the tool. In particular, it is possible to determine the weighted value of the difference, which is proportional to the difference of provisions, while it is preferable that the coefficient of proportionality could set the operator and modify as required. Under this option, any misalignment with a nominal value detected during the measurement can cause a control action that allows you to quickly respond to the error. You can also adjust the position of the tool only when the difference of the provisions of or derived from it the value of the measured difference exceeds a certain threshold value.

To avoid having a permanent error control, error signals are preferably integrated in time by means of the integral controller (I-controller) and use a common control characteristic corresponding to the proportional-integral control (PI controller).

In order to implement the method of measuring the position of the selected structure element initiate in different ways. For example, can be initiated by a start signal to start measurement by software line, which is present in the proper place program numerical control. This provides automatic synchronization software-time function. In this case, the typical accuracy defined by the I time for the measurement is of the order cycle time of the control system, which, for example, may be of the order of one or a few milliseconds. In particular, for measurements performed during fabrication of the section of the spring constant pitch, the precision is enough, because the sampled plot structure actually remains stationary. In other embodiments, the method for determining the time measurement using a timer, regardless of the program numerical control, which is made with the possibility of synchronization with the control time via the numeric control. For example, the timer of this type may be provided in the form of additional charges in the control unit. This allows to obtain a high accuracy of time measurements, regardless of the cycle time of the control system. In some embodiments, the time measurement is determined relative to a control time software-time function with an error of 100 μs or less. As a result, it becomes possible to conduct a reasonably accurate measurements even in those areas of the springs, where the step of winding changes. In such situations, as a rule, there will be a nominal position, which varies in time, i.e. shifting the nominal position, which is the basis of the comparison operation. Therefore, it is impossible accurately determined is whether the time measurement, in order to accurately determine the nominal position of the observed structure element of the spring, which is associated with the specified point in time.

In particular, when carrying out measurements on the parts of the spring with variable pitch may also be useful to conduct repeated measurements in different areas of measurement and using the results of measurements when the system is closed loop feedback. In some embodiments, the implementation of the first measurement performed in the first measurement area, in the first time, with the first measurement area is located at the first distance from the forming mechanism, the second measurement is performed in the following second time in the second measurement area, which is offset from the first zone of measurement and the second measurement area is located at the second distance from the forming mechanism and the second distance greater than the first distance. If the results of two or more dimensions in a physically offset from each other in the areas of measurement shifted relative to each other moments of time to process together, we can get an accurate description of the process of winding the spring in time and trends in case of disagreement with the nominal values. This allows for more precise control of the winding process of the coil springs.

Us is Aasee the invention also relates to spring-coiling machines with numerical control, made with the possibility of implementation of the method described above. The machine includes a feeding mechanism for feeding wire to the forming mechanism containing at least one winding finger, which essentially determines the diameter of the coil springs in the set position, and at least one stepper mechanism whose effect on the emerging spring defines a local step coil spring.

In the preferred embodiment, spring-coiling machine contains the first video camera placed so that the measurement field of view of the first camera writes the image slice plot of the spring at a definite distance from the instruments forming mechanism. Preferably, the distance between the measurement area and the molding mechanism was consistent with the overall length of the finished coil spring so that the specified distance was 5-70%, in particular 10 to 50% of the total length, and/or to within a specified distance fit one or more coils of the spring, for example at least two or three coils. In addition, there may be provided a second camera, which is located at a distance from the first camera, so that in the final phase of manufacturing helical springs area of the free end of the spring included in the capture zone of the second chamber. When using the ameres with a sufficiently wide field of view may be enough for one camera to capture the measurement zones, which is located at a definite distance from the instruments forming mechanism, and area measurements for the detection end portion of the spring.

In some modern spring-coiling machine, CNC that already have suitable measuring system with camera, the invention can be implemented with existing structural conditions. The invention in its embodiments can be implemented in the form of additional parts of the program or software modules or by making changes in the control software of computer control devices.

In its another aspect, the present invention relates to a computer program product that is stored, in particular in a medium readable by a computer, or it exists in the form of the signal when the specified computer program product ensures the implementation of the computer method corresponding to the present invention or a variant implementation, when the specified computer program product is loaded into the memory of a suitable computer and the program runs.

The above and other features of the invention are disclosed not only in the claims but also in the present description and the accompanying drawings for carrying out the invention a separate otlicials the e signs in each case can be implemented by themselves or in groups of two or more signs in combined form, and implemented in other areas, and can be a useful solution, may be the subject of protection.

Brief description of drawings

Figure 1 is a schematic General view of a variant of implementation of the spring-coiling machine with elements of the feeding mechanism and the molding mechanism,

2 is a perspective projection depicts accessories spring-coiling machine 1, including two cameras optical measuring system for non-contact recording real-time data relating to the geometric parameters of the spring, which manufacturing takes place in current time, and a guiding device for the spring

figure 3 depicts created moulder plot springs, which manufacturing takes place in current time, and the image corresponds to the observation in the feed direction of the wire and parallel to the optical axis of the lens of the first camera in the measurement area, which is located within the field of view of the camera, is the area of one turn of the spring,

figure 4 depicts a graph of the time variation of the moving average of the actual values defined in the series of individual measurements during the manufacture of springs, figa shows the change over time without the implementation of the Board and figv shows the change in time with the active control,

figure 5 depicts histograms and charts relating to the variation of the actual values in the series of individual measurements during the manufacture of springs, figa shows the actual values without management, and figv shows the actual values obtained with the active control,

6 depicts a rectangular field of view of the first chamber, and the field of view can be seen to be measuring the area of the spring and the image of the reference element, which is a fixed image is fixed on the machine.

The implementation of the invention

Figure 1 schematically shows the main elements of the spring-coiling machine 100 CNC, the construction of which is as such known. Spring-coiling machine 100 includes an input mechanism 110, which is equipped with feed rollers 112 and executed with the capability to sequentially feed the wire segments 115, which comes from the drive and passes through a guide node feed speed determined by the program area forming mechanism 120. In the molding mechanism is formed of a wire using a programmable instruments to obtain a coil spring. The tools include two winding finger 122, 124, which are mounted radially who otnositelno Central axis 118 (corresponding to the desired position on the axis of the spring), displaced relative to each other at a 90° angle and according to its purpose should determine the diameter of the coil spring. In order to adjust the machine for different diameters of the springs to the original installation of the diameter of the spring in the configuration process, winding fingers can be moved along the lines of movements shown shtrihpunktirnymi lines, and also in the horizontal direction (parallel to the direction of wire feed rollers 112). These moves can be done by using appropriate electrical actuators, controlled by CNC system.

The tool 130 stepper mechanism includes a handpiece, which is essentially at right angles to the spring axis, and comes in contact with the emerging spring in her coils. The tool of the stepping mechanism can be moved by means of drive CNC that caters to the axis of the machine, parallel to the axis 118 of the emerging spring (i.e. perpendicular to the plane of the drawing). The wire which is fed forward in the process of manufacture of the spring, using stepper mechanism is subjected to forced deviation in the direction parallel to the axis of the spring in accordance with the position of the tool, the local step of the springs on the corresponding area is determined by the position of the specified tool. The changing step is carried out by moving the instrument of the stepper mechanism parallel to the specified axis during the manufacture of springs.

The composition of the molding mechanism is an additional tool 140 of the stepping mechanism, which can be introduced vertically from the bottom and contains a wedge-shaped tip, which is injected between adjacent coils when using this tool. When adjusting the tool stepper mechanism does move at right angles to the axis 118. In the form shown in the drawing, the process of manufacturing springs this tool stepper mechanism is not used.

Above the axis of the spring has a cutting mechanism 150 CNC made with the possibility of separation obtained the coil springs from the supplied wire after forming operations, this segment is vertical the labor movement. Figure 1 is supplied wire shows the situation immediately after it has been cut the previous finished coil spring. In this position, half round wire is already formed, and the end of the wire, forming the beginning of spring, 0.3 coil does not reach the position of the tool 130 stepper mechanism.

Axis control spring-coiling machine, CNC that match the specified mechanisms, provides the controller 180 of numerical control, which contains a memory device in which is stored the control program that contains, among other things, the program number of the new control for the labour movement mechanisms on the working axis.

To manufacture coil spring, starting from the position shown "the end of the previous spring, with the help of the feeding mechanism 110 is made of a wire in the winding direction of the fingers 122, 124, which rejects the wire at the required diameter, forming a curved section in the form of an arc of a circle, while the free end of the wire reaches the tool 130 stepper mechanism. When the wire feed continues, the axial position of the tool 130 will determine the current local step of forming helical springs. When you want to change the step in the process of winding the spring, then you are moving the tool 130 of the stepping mechanism in the axial direction under program control numeric control. The actual movement of the stepper mechanism essentially determines the profile of the step along the length of the coil spring.

When configuring a spring-coiling machine make installation tools forming mechanism in their respective original positions. In addition, create or load a program numerical control that controls the working movements of the instruments in the process of manufacturing springs. The input geometric data in a spring-coiling machine produces the operator with unit 170 of the display and control, which is connected with the control device 180.

Further, according to the SNO 2 will be described a number of auxiliary devices, useful for implementation of the method of manufacturing the coil springs in a spring-coiling machine, presented in figure 1. The elements which are already known from figure 1, are denoted by the same numbers as in figure 1. Figure 2 shows a spring-coiling machine in the manufacturing process is relatively long cylindrical coil spring 200, of which approximately 20 turns already made at the time shown in the drawing. It's a long spring with respect to the total length L of the finished spring to its diameter D (L/D) greater than 10. So as spring growth with continued feeding of the wire spring is straight and its free end was not Athabasca down, provided a guiding device 210. A guiding device contains gon 212 that its horizontal longitudinal axis attached to the frame spring-coiling machine, and has a V-shaped profile. Converging down flat sloping surface of a square support spring on the bottom and the side, so that the longitudinal (Central) axis of the forming of the spring coincides with the above axis 118. Gon is attached to the frame of the machine by means of a holder (not shown), which can be adjusted in height and in the transverse direction to the desired direction coinciding with the Central axis 118 of the spring, for springs of different diameters. At the end of the process from which otopleniya spring gon can be automatically deployed downwards by means of a hydraulic actuator rotation, to enable ready spring to slide in the container.

The end of a square, which is directed to the forming mechanism, located at a distance of several centimeters from the last, so that between the instruments forming mechanism and the edge of the square, facing the machine, remains free-hanging section 202 of the spring. The length of a square is selected in accordance with the overall length of the finished coil spring so that the end section of the spring, which made the first, in the final phase of manufacturing freely advocated far from the car to the edge of the straightedge. Thus, the middle to car free-hanging section 202 of the spring and far from the car the tail section 204 of the spring are available for optical measurements with the direction of sight at right angles to the longitudinal axis of the coil spring.

Spring-coiling machine is equipped with an optical measuring system based on video cameras for contactless reception of real-time data relating to the geometric parameters of the spring, which manufacturing takes place in current time. The measuring system contains two identical CCD camera 250, 260, which have a resolution of, for example, 1024×768 pixels (picture elements), can generate up to 100 images per second (frames per seconds is) and via the interface to transmit them to the image processing system, which is connected with cameras. The recording of the individual images is triggered every time a trigger signal from the control system. This determines the points in time of the measurement. The image processing program housed in a software module that communicates with the control device 180 spring-coiling machine or integrated in the control device.

Both cameras are mounted on a mounting rail 255, durable against twisting, which one side is attached to the frame spring-coiling machine next to the guiding device of the springs in the area of the guide rollers of the feeding mechanism, so that the longitudinal axis of the mounting rail runs parallel to the axis 118 of the machine. The measuring chamber can be moved in the longitudinal direction of the mounting rail and fixed in any selected position along the length of the rail.

The first camera 250, nearest to the frame, is installed so that its rectangular box 252 of view (image area) captures the part of the free-hanging section 202 of the spring at some distance from the forming mechanism (figure 3). The optical axis of the camera lens in this case is approximately on the same level as the Central axis of the coil spring (i.e. at the level of the axis 118), and runs at right angles to the said axis. Inside the rectangular field 252 of view to the measures visible rectangular area 254 dimensions smaller through which the inclined top left and bottom right is a part of the coil spring facing the camera. The image of this site loop (which moves in the longitudinal direction in the manufacturing process of a spring) or its path, far from the bed, is used as a structure element for measuring length.

The second camera 260 is designed to record images free end 204 of the spring and, hence, is located on the mounting rail so that the free end of the spring got into the field of view of the second camera in the final phase of manufacturing helical springs.

At the height of the axis 118 diametrically opposite the camera is in the illuminator, which in response to trigger signals from the control unit produces light in the form of flash in moments of run-time measurement, defined by the management system that enables the measurement of transmitted light. Aside from the cameras can be provided by the device front lighting to improve visibility of the interesting parts of the spring to measure.

Figure 3 presents the situation discussed in figure 2, which can be observed in the direction parallel to the feed direction of the wire (in the direction of the axis With spring-coiling machine), or in the direction of the optical axis of the lens of the first camera. Left in the to do section of wire 115, fed in the feed direction (at right angles to the plane of the drawing) on a curved inclined surface of the lower winding of the finger 124. Winding finger directs the wire up trajectory, which represents a curve of a circle, in the direction of the upper winding of the finger, and in the process there is a continuous forming wire. Over winding finger, you can see the tip of the tool 130 stepper mechanism, the side working surface of the winding finger lies on the emerging stage. The stepping mechanism may, by the CNC using the actuator of the corresponding machine axis to move parallel to the axis 118 of the spring (in the direction of the arrow), while the position of the tool stepper mechanism sets the local step of the springs in the place of its formation.

Figure 3 shows the situation of the initial phase of manufacturing a cylindrical coil spring 200, which has a contact area 206, which is already formed on the end of the spring and has a continuously increasing step, followed by section 208 of the fixed step and the opposite contact area with decreasing step, which is not yet formed at that point in time, which corresponds to the drawing. At that point in time, which corresponds to the drawing, the manufacturing process has already advanced to such an extent that when the free end of the spring contact area is area 254 measurement and has already reached a straightedge guide device, while freely hanging end 202 of the spring constant pitch occupied a stable position and its axis coincides with the axis 118.

The first camera 250 is exposed so that the zone 254 of the measurements is at a relatively great distance 210 from the tools 122 and 130 forming mechanism, when viewed in the axial direction of the coil spring. In this case, the specified distance captures approximately four spiral coil spring. In this example, the specified distance is approximately 10-20% of the total length of the finished spring, and in particular, in the case of short springs this distance can reach 30%, 40% or 50% of the total length.

For mass production of coil springs with this spring-coiling machine can be adopted the following procedure. First of all, at block 170, the display and control enter the required nominal geometrical parameters of the coil springs or from memory spring-coiling machine loads the appropriate existing geometric data, for example, by entering the number of the spring. The so-called generator commands the CNC uses these geometric data as the basis for calculation program numerical control individual units and their sequence during the further manufacturing process of the springs operate in a coordinated manner the workers moved the of bodies and tools spring-coiling machine.

After setting up the instruments forming mechanism during the first trial (control) manufacturing produce the first coil spring, not including the work management system, equipped with a measuring system. In this case, the first camera 250 in area 254 measurements writes the selected structure element of the spring, in this example plot of a coil that passes through the measurement area, sloping top left and bottom right. On the camera image, this site looks dark, clearly standing out against the bright background in the form of straight lines of the contour of the transition from light to dark. To improve the ability to distinguish contours, the coil spring can be lit from the side of the camera and/or to illuminate the inner space in the measurement area. Emerging in the field of view far from the bed boundary (edge of the given area of the coil) is used to determine the actual position of the element patterns of the spring. For example, in this case, the image processing system may determine the coordinates of the top point 256-1 crossing and the lower point 256-2 crossing the transition zone "light/dark", respectively with the upper and lower boundaries of the zone of measurement, determination of the coordinates of points of a straight line lying between these points 256-1 and 256-2, manufactured by interpolation. Then, by means of the tool R is sloani" program image processing to determine the distance (distance counts parallel to the axis) from the reference point 270, located in the middle between the upper and lower points of intersection, to some remote from the frame reference (reference) point to obtain a first actual position value of the element patterns. In the example shown in figure 3, the closest to traverse straight left boundary field 252 of view is used as a virtual reference element or as a "fixed focus" for dimensions. The distance, measured parallel to the axis (axis 118) between the reference point 270 on the selected structure element and the reference element, the control system then takes as a first nominal value by further manufacture of springs.

Then independently measure the overall length of the finished spring. If the total length is within tolerance, then assume that the measured first nominal value can be taken as initial values for the subsequent mass production of springs. On the other hand, if the total length does not fit in the tolerance, then make changes to the settings of the manufacturing process, in order to make appropriate the following control measurement for the next spring. Such individual control measurement, repeat steps until made spring will not be within the tolerance parameter total length wintopo the spring. The nominal value for the element patterns, which will be determined during the manufacture of such a "satisfactory" springs, then take for the mass production of springs.

For example, in this case, you must take steps to ensure that the definition of the specified nominal values occurred at a time when section 208 of the spring constant pitch is already in the zone 254 measurements. Under these conditions, the absolute value of nominal size remains constant for a relatively long period of time, resulting in the ideal case, no change of the image forming springs, which is recorded by the camera, while the turns of the plot, with constant step move in the field of view of the camera.

Can then be set up and entered into the work management system to perform the following spring party. In this case, the measurements should begin only when the contact area, which can be coils with increasing step, already pass through the measurement area, and area measurements will be part of a spring with a constant step. Then begins the cycle of control. The cycle begins with the first measurement of the actual distance between the selected plot structure and specific reference element (edge of field of view). Then, through analysis yuusha program compares the measured actual position or actual measured distance with the previous measured nominal position or a nominal distance of the element patterns. This calculation comparison gives the value of the current difference of the provisions, which represents the difference between the actual position and the nominal position at the time of measurement. The following example will be given numerical values for each case, for clarity, without specifying dimensions, although for example it can be dimensions in millimeters.

If, for example, the nominal value of 10.5, and the actual value is equal to 10.7, then the difference of the provisions of the equal -0,2. Based on this difference of provisions determines the weighted difference. To this end, in this case, use a weighing parameter (weighting factor), which can be set by the operator and is called the "step control". The weighting factor is determined as a percentage and applied to the measured difference of the provisions. For example, if you specify a control step equal to 50%, then the difference of the provisions -0,2 gives the weighted difference -0,1. This value, which is obtained after weighting, is now added to the original value of an amendment to get a new (modified) the adjustment value. The source, for example, the correction rate can be estimated to be equal to 0 (zero) and then may be its step-by-step change management process. In this example (initial correction rate is equal to 0) calculates a new correction rate 0+(-0,1)=(-0,1), which is may be passed as amendments to the control system of spring-coiling machine.

At certain points program management preparation program of numerical control, so that the programmable logic controller (PLC) program numerical control can instantly change the settings according to the magnitude of the amendment. This change directly (in real time) affects the position of the tool 130 stepper mechanism to reduce the difference of the provisions.

During the next second, measuring, for example, defined actual position with a value of 10.6. At nominal value, equal to 10.5 (which is still valid), it gives the difference of the provisions of the equal -0,1. At a constant weighting factor (step 50%) this gives the value of the weighted difference be-0.05, therefore, the adjustment value: (-0,1)+(-0,05)=-0,15. It is seen that the updated amendment does not apply to the initial value amendments (=0), and to the magnitude of the amendments (-0,1), which was derived from data of the previous measurement. After the second measurement correction rate is 0.15 and, therefore, is passed as an amendment to the control system, where it is processed in the manner described above to make immediate changes in the program of the numerical control.

Described above on the example of processing of the measurement data corresponds to a proportional-int is the integral control (PI controller) with a variable proportional component and the effect of integration of the integral component.

In the process of building plot with constant pitch helical springs these steps produce a frequency measurement, thereby or giving the opportunity to perform many acts of management. During the measurement, the wire is continuously and stop filing is not required. The time interval between consecutive measurements in this embodiment of the method will coordinate with wire feed speed so that between two adjacent consecutive measurements was approximately 1.4 coil springs. In such measurements, a relatively rare compared with possible frame rate of the camera, in the case of non-ideal conditions forming in the spring between the individual measurements can manage to accumulate the error length is sufficiently large compared to the measurement error of the measuring system to provide meaningful measurements that will allow you to initiate amendments to the proper value, the current in the proper direction.

The effect of management procedures, providing increased accuracy can be illustrated by figa, 4B and 5A, 5B. In these figures shows the results of measurements that were obtained during the manufacture of the damping spring clutch, consisting of 47 turns of spring wire diameter is m 3,8 mm Springs have a diameter of about 27 mm and a total length of about 350 mm Each graph figa, 4B represents the scan time of the moving average values to the actual values obtained in the individual measurements during the manufacture of the spring. On the x-axis in each case the deferred appropriate measurements, evenly spaced dimensionless number, and thus, the abscissa represents the time axis. The ordinate in each case show the values of the moving average of the actual values in comparison with the nominal value 10,55 mm, which is represented by a thicker line. On figa shows a typical graph of the measurements for the traditional manufacturing process without management. The making of a new coil spring starts at the time indicated by the number 351. The final phase of production of the previous spring depicted to the left of this point, ending too low average value (approximately 10,48 mm), resulting in overall length made of spring is insufficient. The actual values for the new coil spring is initially too high, the moving average first coming to the nominal value, then, however, falls below the nominal, and the decline increases with distance, resulting in this screw is the first spring after the manufacturing is also too short.

Figv illustrates the manufacture of springs when the control system. Making the previous spring ends at time 405 on average, very close to the nominal value, resulting in the total length of the spring is very close to the value of the nominal length. In the manufacturing process following the coil springs of the actual values initially are lower rated. However, the control action leads to the fact that the moving average approaches the rated value (10,55 mm) after the third dimension, with the end of the manufacturing process moving average asymptotically approaches the nominal value and at the end of the manufacture of the spring value of the moving average is almost exactly the same as the nominal value.

Figa, 5B are another illustration of the effect of the operation of the control system. On figa presents the results without the participation of the management system, and FIGU - results-enabled control system. The graphs on the right, again in each case, on the x-axis is an arbitrary number, corresponding to the points of measurement, and the ordinate axis corresponding values of the difference of the provisions is the difference between the actual and nominal values. Thick lines at the top and bottom, parallel to the zero line represents the t of a tolerance for the manufacture of springs. The results of the measurements are presented in the form of histograms in the left part of the figures.

In the manufacturing process of the springs without the participation of the management system, which is shown in figa, the actual values have a wide range on either side of the nominal value, although all values are within the tolerance limits. When enabled management system (pigv), the resulting variation around the nominal value is much less than that ensures that all of the coil springs, made with the participation of management systems, have a common length, very close to the nominal value of the total length.

The first camera 250 is placed on the installation rail 255 relatively close to the forming mechanism, allowing any fluctuations in the place of installation of the first chamber will occur only with small amplitude, which is unlikely to some extent adversely affect measurement accuracy. However, the offset of the camera on the accuracy of the measurements can have a negative impact. 6 explains one of the possible ways to make the measurement independent of camera shake, and thus improve the accuracy of the measurements. Figure 6 shows a rectangular box 652 view of the first camera. Rectangular area 654 dimensions smaller comprises passing virtually vertically from top to bottom contour plot of a coil, which is located in the focus of the camera to face the camera. The coordinates of the actual position of the observed structure element springs are determined by interpolation between the intersections of the contour of the transition "light/dark" with the upper and lower boundaries of the zone of measurement. In addition, in the field of view you can see the image of the reference element 680 formed by a vertical bolt rigidly attached to the frame of the machine. In the field of view of the bolt is on the bottom and in the zone focus camera creates a sharp image of the vertical contour with the transition "light/dark". Next, in the measurement process to determine the distance between the element patterns of the spring and the edge of the reference element 680, facing the element patterns, and use the specified distance for analysis as the actual size. This measured distance is not dependent on the fluctuations of the camera and related any displacement of the field of view relative to the observed spring. Thus, any displacement of the camera are excluded from measurement error.

Measure the distance between the element structure of the coil spring (for example, a contour plot of a coil) and a virtual or physical control element can be performed, as mentioned, in the direction parallel to the axis 118 or inclined to the axis in other suitable directions.

In detail, the above-described embodiments of the invention have treated the problem made the program a long spring with more than 30 turns. In the process of testing (the results of which in the figures are not shown) were made of a spring with a length of about 65 mm, containing only 7 turns. Measurement in the manufacturing process was performed only twice with the introduction of the relevant amendments. It was possible to reduce the variation of the total length of approximately 0.3 mm (without control) to about 0.15 mm (with management).

Alternatively or as a complement to the above measurement is relatively fixed on a physical machine control element, and in some cases can be measured relative to the reference element, formed part of the spring. For example, if the field 252 of view, as shown in figure 3, is sufficiently broad to capture more turns in the direction of the length of the spring, then be measured and used as reference value for process control could be the interval between the reference point 270 on the loop coil located in the zone 254 of the dimensions and contour of the respective coils, located on 3-4 step closer to the forming mechanism. For example, the first full stage 214 or its outline, far from the bed, could thus be used as a reference element.

1. A method of manufacturing helical springs by spring winding with the aid of spring-coiling machine, CNC, in which by means of the feeding mechanism, the input is the future in the composition of the molding mechanism spring-coiling machine, using CNC program submit the wire and forming tools forming mechanism to form a coil spring, characterized in that it comprises the stages on which
specify the required nominal geometrical parameters of the coil spring,
measure the actual position of the selected structure element coil spring relative to the reference element at least at one point of time between the beginning and end of manufacturing helical springs, in the measurement area, which is located at a definite distance from the forming mechanism in the direction of the length of the coil spring, and a specified distance less than the overall length of the finished helical springs,
compare the actual position of the element structure from its nominal position by means of a CNC program for a specified time to determine the current difference of the provisions, which represents the difference between the actual position and the nominal position at the time when the measurement was made, and
depending on the difference of the provisions of the operate position by means of at least one molding tool mechanism, which sets the step coil spring.

2. The method according to claim 1, characterized in that the distance between the measurement area, and fo is Molochny mechanism will agree with the total length of the finished helical spring to the specified distance was 5-70%, in particular 10 to 50% of the total length, and/or to within a specified distance were placed one or more coils of the spring.

3. The method according to claim 1, characterized in that for measurements using the camera with two-dimensional field of view, with a measurement feature in the field of view specified camera.

4. The method according to claim 1, characterized in that the actual position is measured relative to the reference element fixedly mounted on the machine.

5. The method according to claim 4, characterized in that use virtual fiducial element formed by the edge of the field of view of the camera, preferably the edge of the field of view closest to the forming mechanism, or provide physical fiducial body fixedly mounted on the machine, which have a distance from the zone of measurement in the field of view of the camera, with one element of the reference body, in particular straight edge, used as a measurement reference element.

6. The method according to claim 1, characterized in that the selected structure element coil spring, which is used for measurements is a contour plot of a coil, which is in the form of a straight line appears in the field of view of the camera and passes across the axis of the helical spring, in particular at an angle of approximately 45° to 90° to the direction of the axis.

7. The method according to claim 1, distinguishing the I, what are the coordinates of the nominal position of the element patterns during measurement is obtained from the program-time function, which is determined prior to measurement for coordinates of the nominal position of the element structure when the specified program-temporary function to coordinate the nominal position of the element structure is preferably determined on the basis of experimental results in at least one trial production control coil spring.

8. The method according to claim 1, characterized in that in the manufacturing process of the coil springs perform multiple measurements at successive time intervals between them, and the time interval between measurements preferably agree with the wire feed speed so that the time interval between adjacent consecutive measurements were obtained at least one coil, more preferably, within a given interval of time was from one to two turns.

9. The method according to claim 1, characterized in that in the manufacture of the plot springs with constant step perform multiple measurements on the basis of actual values of the results of repeated measurements after a certain number of measurements, in particular after each measurement, determine a moving average of the actual values of the s, at the same time on the display device spring-coiling machine in the preferred embodiment, showing the change in the value of the moving average in time.

10. The method according to claim 1, characterized in that for each set of difference provisions determine the weighted value of the difference, which is proportional to the specified difference provisions, while, on the basis of the weighted difference, change the position of a particular instrument.

11. The method according to claim 1, characterized in that measurements plots of the spring with the changing step first measurement performed in the first measurement area, in the first time, with the first measurement area is located at the first distance from the forming mechanism, the second measurement is performed in the following second time in the second measurement area, which is offset from the first zone measurement and the second measurement area is located at the second distance from the forming mechanism, and a second distance greater than the first distance, and the results of the first measurement and the second measurement process together.

12. Spring-coiling machine (100) CNC machine for making coil springs (200) by the winding method according to one of claims 1 to 11, containing a feeding mechanism (110) for wire feed (115) to the forming mechanism (120)containing at least one winding finger (122, 124), to the which essentially determines the diameter of the coil spring at the specified location, and at least one tool (130) of the stepping mechanism, the impact of which on the emerging spring defines a local step coil spring.

13. Machine 12, characterized in that it contains the first chamber (250), placed in such a way that the zone (254) measurements in the field (252) of the first view camera writes the image slice plot of the spring on the target distance (210) from the tools forming mechanism (120), the distance (210) is preferably aligned with the overall length of the finished coil spring so that a specified distance is 5-70%, in particular 10 to 50% of the total length, and/or so that within a specified distance of the falls one or more coils of the spring.

14. Machine according to item 12 or 13, characterized in that it contains a second camera (260), which is located at a distance from the first camera (250) so that in the final phase of manufacturing the coil spring section (204) of the free end of the spring enters the capture zone of the second chamber.

15. The computer-readable storage medium with stored computer software product, in particular in the form of the signal when the specified computer program product ensures the implementation of the computer method according to any one of claims 1 to 11 when loading the specified product in the computer memory.



 

Same patents:

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used in devices intended for increasing spring capacity and working performances. Proposed device comprises barrel to receive inserts and spring to be tested arranged there between. Barrel ID varies from compressed spring diameter to that of coiled spring. Punch with ball surface stays in contact with ball surface of top insert attached to said punch by screw with washer to rotate and displace relative to barrel axis and allow its axis to deflect from punch axis. Spline grooves are made on punch screw and top insert central bore to arrange spring-loaded alternating friction discs jointed by splines with punch screw spline grooves and top insert spline grooves. Insert end faces are provided with surfaces with thrust that features depth making, at least spring coil height to follow profile of the spring extreme coil end faces. Overrunning coupling with screw surface is fitted inside bottom insert to interact with screw surface of the rod coupled with press bottom cylinder ejector. Rod cylindrical section has alpines or spline groove to interact with mate splines or keys of the device bottom plate.

EFFECT: possibility of use in quantity production, ruled out hand work.

2 cl, 1 dwg

FIELD: process engineering.

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FIELD: machine building.

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EFFECT: targeted action at an inner surface of spring turns by means of plastic deformation.

3 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used for spring reconditioning at automotive machinery repair fabrics. Proposed method comprises stretching, heating and holding the spring as-stretched unless cooling-down. The spring is stretched on mandrel with coil pitch exceeding that of finished spring, heated to tempering temperature of 400-420°C and tempered as-stretched. Then, shot-blast cold-hardening is carried out for re-tempering at 230-250°C and pressing by axial load making (10÷300)F3, where F3 is spring force at maximum strain.

EFFECT: longer life, expanded performances.

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used for spring reconditioning at repair fabrics. Proposed device comprises bed, rest bolted thereto and provided with support rollers to support screw mandrel. Mandrel end has groove corresponding to stretched spring ID. Device head with built-in roller has groove made on its outer radius to correspond to stretched spring coil radius. Threaded strut accommodates pressure screw to transfer motion to head roller. Another strut accommodates screw mandrel wherein clamp with hole is fitted to fix stretched spring first coil. Screw mandrel consists of cylindrical and threaded sections, made separate to allow their replacement. Screw mandrel cylindrical section is fitted in hole made in threaded section and clamp therein to fix first coil of stretched spring in screw mandrel. Device elements ensure tight contact between roller and stretched spring coil.

EFFECT: longer life, lower reconditioning costs.

3 cl, 5 dwg

FIELD: process engineering.

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2 dwg

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EFFECT: expanded performances, lower costs.

4 cl, 6 dwg

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2 cl, 1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used in repair of whatever machinery. Proposed method comprises expanding, heating and holding stretched spring till cooling. Spring heated to tempering temperature is expanded to coil pitch exceeding that of finished spring and tempered as-expanded till cooling. Then, spring is peen hardened and pressed by axial load making 10…300 F3, where F3 is spring force at maximum strain.

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4 cl

FIELD: process engineering.

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2 cl, 1 dwg

FIELD: turn formers used in high-speed mills for rolling wire in order to impart coil shape to rods.

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EFFECT: lowered slippage and vibration caused by gaps in front bearing assembly of turn former.

9 cl, 4 dwg

The invention relates to the processing of metals by pressure, in particular to the manufacture of wire products

FIELD: turn formers used in high-speed mills for rolling wire in order to impart coil shape to rods.

SUBSTANCE: bearing assembly for mounting rotating hollow shaft in casing of turn former of rod rolling mill includes first and second roller bearing units mutually spaced in axial direction and arranged between hollow shaft and casing; mechanism for applying radial preliminary- interference effort to first bearing unit in first zone on its peripheral surface and causing counter-acting reaction effort in second zone of second bearing unit in its peripheral surface spaced by 180° from first zone. Each roller bearing unit includes roller members between round inner and outer races. Inner races are fixed relative to hollow shaft. Outer races are fixed relative to casing. Mechanism for applying effort rests upon casing and it is mounted with possibility of acting upon outer race of first bearing unit. Reaction force is applied by casing acting upon outer race of second bearing unit. Method for reducing gaps between constructional members of bearing assembly comprises steps of dividing bearing assembly by roller bearing units mutually spaced in axial direction; applying preliminary-interference effort to one bearing unit in first zone on its peripheral surface and creating counter-action due to providing reaction force acting upon other bearing unit in some zone on its peripheral surface spaced by 180° from first zone.

EFFECT: lowered slippage and vibration caused by gaps in front bearing assembly of turn former.

9 cl, 4 dwg

FIELD: machine building.

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15 cl, 6 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used for making high-loaded helical springs subjected to both axial and radial forces. Proposed method comprises spring coiling, thermal treatment, preparing thrust coils, cold upsetting, and shot-blast cold-hardening of spring outer surface section. Length of said section makes one fourth of spring turn circumference to half the circumference. Preset spring outer surface section is subjected to ordered shot-blast cold-hardening.

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4 dwg

FIELD: process engineering.

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EFFECT: higher quality of springs.

2 cl, 2 dwg

FIELD: medical technique.

SUBSTANCE: apparatus includes base supporting guides and carriage mounted with possibility of motion along guides. Rotary platform is mounted on base behind horizontal guides of carriage. On one edge of platform there is opening in which vertical shaping pin is arranged. Said pin is secured to base. On other edge of platform there is indicator of platform rotation angle. Guiding tube is mounted between said edges and pressing spring if arranged in parallel relative to said tube with possibility of axial motion. Adjusting and pressing screws are mounted respectively at both ends of said spring. Carriage includes clamping mechanism and handle moving carriage on guides. Member for controlled limitation of horizontal motion of carriage is mounted on base between horizontal guides of carriage.

EFFECT: possibility for simplified forming of curvilinear profile of distal part of bowden.

1 dwg

FIELD: manufacture of springs, possibly for furniture, particularly manufacture of springy mattresses for soft furniture.

SUBSTANCE: method comprises steps of feeding round cross section wire; forming and binding knots on supporting turns due to twisting wire end under predetermined pressure around supporting turn; before forming spring blank, imparting to wire out-off-round cross section or making spring blank from wire having out-off-round cross section. When wire end portion is twisted around supporting turn in contact zone of twisted wire and wire of supporting turn recesses are formed on portions of supporting turn wire having positive deflection from out-off-roundness due to creation of pressure exceeding preset value. Twisted wire is pressed-in to said recesses.

EFFECT: enhanced strength of knots, increased useful time period of spring, operational reliability of articles.

2 cl

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