The method of measuring the geometric parameters of the surfaces slozhnoprofilnyh objects and device for its implementation

 

The method of measuring the geometric parameters of the surfaces slozhnoprofilnyh objects and device for its implementation. The method includes the direction in controlled surface of a narrow laser beam, receiving from the other angular direction of the reflected laser beam on the integral multiple of photolyase, video processing, which determine the range to each point of the test surface along the Z axis, the movement of the controlled object on the X-axis and/or Y, simultaneous automatic fixation coordinates of each point of the test surface in the PC to determine the actual profile of the test surface. Additionally admit beam transmitted through controlled surface, record the coordinates of the points of the beginning and end of the through passage of the beam corresponding to the edge surface or the edge of the hole it in the computer memory to determine the coordinates and configuration of holes on the surface. The technical result - the control of geometrical parameters slozhnoprofilnyh objects, provided with perforations and/or fins. 2 ad and 3 C.p. f-crystals, 1 Il.

Known presently used method for measuring geometrical parameters of GTE blades using opto-mechanical device for controlling blades [1]. The apparatus consists of a table with a fixed base and movable in one dimension the horizontal plane (X) the upper part. On the table still set the reference blade, pen along which moves a contact block provided with a pin cylinders, pressed against the reference surface of the scapula. Using the optical system, the profile of the ends of the cylinders with the increase projected on the matte screen. The length of contact of the cylinders selected by reference to the blade so that the ends of the cylinders was a straight line. When measuring the controlled blade controller visually by comparing determines lies whether the profile of the measured blade in said tolerance zone on the screen.

This method has the following disadvantages. The measurement process is long and laborious. It is inaccurate because of the large hardware imprecision and subjectivity of information retrieval. The way AOI (less than 10 - 12), and the minimum step between points is 5 mm, It requires special education, training and experience of the operating staff. Using this method would not be economically viable due to the need of production for each size of the reference blade and a set of contact of the cylinders. Also, the known method has a limited scope due to the fact that reading of data is carried out by contact method.

Some of these drawbacks are eliminated in the Method of measurement using coordinate measuring machines (CMM) for dimensional control of parts of complex shape, for example, manufactured by DEA IT [2]. These machines represent the horizontal stationary table for mounting and positioning of the measured product, movable relative to the table sensing element for information retrieval, in the form of the probe, which is connected through an electronic processing unit with the computer, providing the analysis and display of information.

The disadvantage of this method is the contact method of information retrieval, which dramatically reduces its performance, functionality and accuracy. Indeed, the contact method assumes sufficient, when point-by-point scanning surface, the scanning step is limited by the size and area of the contact surface of the probe. Mechanical contact of the probe with the surface of the test object imposes restrictions on the abrasive and the surface roughness and its strength properties, in particular hardness, and limits the service life of the probe.

The closest in technical essence and the achieved result is a Way of measuring pen blades, described in [3]. This method is chosen for the prototype.

The way the prototype is in the direction of the controlled surface of a narrow laser beam, receiving from the other angular direction of diffusely reflected (scattered) of the laser beam on the integral multiple of photometric, the video processing for highlighting information about the position of the center spot, which determine the range to each point of the test surface along the Z axis, the movement of the controlled object on the X-axis and (or) The simultaneous automatic fixation coordinates of each point of the test surface in the computer memory to determine its actual profile.

The system prototype contains the location for installation of the measured blade, bone and equipped with sensors, linear displacement, tool for information retrieval made in the form of optoelectronic head mounted on a vertical bracket rigidly connected to the fixed base table comprising a source of a narrow light beam, such as laser, optically coupled between a lens and an integral multiple of photometric, the output of which is connected to the first input of the electronic unit of the primary signal processing, second and third inputs of which are connected with the linear displacement sensors, and the output from the means for processing, recording and display of information, which used a computer.

Method and device-the prototype can measure with a high degree of accuracy of the surface profile, however, when approaching its edges is the ambiguity of recognition received image, due to the peculiarities of the triangulation method. In addition, the prototype method is suitable for cases of edges only on the geometric perimeter of the controlled object. However, in practice there are slozhnoprofilnyh objects, is provided on the entire surface of the macro - or micro-perforation and fins. This object is, for example, melted terminal length width height which has its edges, also required measurements.

The challenge which seeks the invention is to remedy these disadvantages, namely the creation of a method of measuring the geometrical parameters slozhnoprofilnyh objects, provided with perforations and/ or fins, and device for its implementation.

The problem is solved in that in the method of measuring the geometric parameters of the surfaces slozhnoprofilnyh objects, including direction on the controlled surface of a narrow light beam, receiving from the other angular direction diffusestrength light beam at an integral multiple of photometric, the video processing for highlighting information about the position of the center of the light spot, which determine the range to each point of the test surface along the Z axis, the movement of the controlled object on the X-axis and/or Y simultaneous automatic fixation coordinates of each point of the test surface in the PC to determine the actual profile of the test surface, unlike the prototype additionally carry out a reception beam, held through a controlled surface, record the coordinates of the start points and end is mate PC for positioning and configuration of holes on the surface.

In addition, the problem is solved in that in order to increase the measurement accuracy by eliminating “dead zones” near edges and ribbed sections of the controlled object is set in a different angular position about the horizontal axis.

The problem is solved by a device for measuring the geometric parameters of the surfaces slozhnoprofilnyh object contains a table consisting of a movable in a horizontal plane along the axes X and Y of the carriage, the actuator is equipped with sensors, linear displacement and the fixed base, which is rigidly connected vertical bracket, which is fixed to the optoelectronic cylinder, comprising a source of a narrow light beam, such as laser, optically coupled between a lens and an integrated photometric, the output of which is connected to the first input of the electronic unit of the primary signal processing, second and third inputs of which are connected with sensors linear displacement of a movable carriage, and the output to the input means of processing, recording and display of information, which used the PC, and on a movable table-top hard-coded means of reinforcing measured him space, at the bottom of which has a photodetector, the output of which is connected to the fourth input of the electronic unit of the primary processing of signals, and means for fastening the measured product is made in the form of a turntable, equipped with electric and an angle sensor connected to the PC.

The drawing shows a functional diagram of the inventive device.

The proposed device for measuring surfaces slozhnoprofilnyh object contains a table consisting of a movable carriage 1 and the fixed base 2. Movable carriage 1 is arranged to move along the axes X and Y horizontal plane, which has two actuators 3 and 4 and the two linear displacement sensors 5 and 6. With a fixed base table 2 is rigidly connected to the bracket 7, which is fixed to the optoelectronic head 8 includes a laser light source 9, a lens 10 and the integral photometric 11, the output of which is connected to the first input of the electronic unit of the primary signal processing 12. On the movable carriage rigidly mounted means for fastening of the object measured is made in the form of a rotary table 13, is supplied by a motor 14. The angle of rotation of the rotary table 13 with sacripanti movable carriage 1 has a groove 17, corresponding to its working space at the bottom of which has a photodetector 18, the output of which is connected to the fourth input of the electronic unit of the primary signal processing 12. The turntable 13 can be further provided with a snap that before fixing the set of measured product taking into account its geometry and strength characteristics (not shown). The electronic unit of the primary signal processing 12 is implemented similar to the prototype, and its output is connected to the PC 19.

The inventive method is carried out as follows. Controlled object, such as a blade, is mounted in the rotary table 13 directly or via an optional mount. The pen blade is directed narrow beam from the laser light source 9. The image of the laser spot formed on the diffuse component of the reflected laser beam is projected through the lens 10 on an integrated photometric 11. The electronic unit of the primary signal processing 12 provides the sweep of photometric 11 and the corresponding video processing for highlighting information about the position of the projection center spot in the required dynamic range of intensity changes. Centre code provisions spots t change his profile proportionally varies the position of the projection spot on integrated photometric 11. Moving the test object 15 with the movable carriage 1 with simultaneous automatic latching coordinate table and the distance from photometric 11 to the test surface, in the memory of the personal computer 19 receives information to restore the profile of the test surface.

In the process of moving the movable carriage 1 there is a situation, when the beam from the laser light source 9 is not reflected and passes through and is received by the photodetector 18. This happens in two cases. First, when the beam crosses the edge of the measured object 15, and secondly, when the surface of the measured object has a hole (perforation or Microperforation) and the beam crosses the edge of the beginning of the hole. When crossing the edge of the end openings of the beam is again reflected from the surface, and the signal at the photodetector 18 is missing. Thus, the fixing holes and their sizes on the surface of the measured object. When the object provided not only holes but fins, when measured in the same angular position of the object 15 are so-called “dead zones”, i.e. the zone “not visible” DL is hacivat in another angular position and measured again. Such provisions can be arbitrarily long, depending on the configuration of the measured object.

Thus, in the present method of control implemented at the same time the shadow and triangulation methods of obtaining information about the geometry of the object. This in turn allows full control of surface parameters of the controlled object, and parameters perforations and beading on it. The ability to rotate the test object at any angle from 0 to 360°) allows not only to eliminate “dead zones” in the control, but to produce a measurement of the controlled object is round, such as “back” and “ trough” of the scapula. For this control does not require any mechanical reinstalling the controlled object in the snap, which significantly reduces hardware error of measurement, i.e., increases its accuracy.

The combination of the two methods of control also allows you to significantly reduce the testing time. There is no need for any contact templates, reference objects, and so on, which reduces the complexity and cost of control operations in the overall process. This method and device for its implementation allow the et to implement a method of selective Assembly and to reduce losses to the marriage.

Sources of information

1. Passport and technical description of the instrument opto-mechanical control blades POLL - 4, factory - VPO “Techniques”, Vladimir, 1986

2. Brochure of the firm's DEA, Italy, 1995

3. Certificate of utility model No. 4601, publ. 16.07.97, prototype.

Claims

1. The method of measuring the geometric parameters of the surfaces slozhnoprofilnyh objects, including direction on the controlled surface of a narrow laser beam, receiving from the other angular direction of the reflected laser beam on the integral multiple of photolyase, the video processing for highlighting information about the position of the center spot, which determine the range to each point of the test surface along the Z axis, the movement of the controlled object on the X-axis and/or Y, simultaneous automatic fixation coordinates of each point of the test surface in the PC to determine the actual profile of the test surface, characterized in that it further perform receiving the beam transmitted through controlled surface, record the coordinates of the points of the beginning and end of the pass-through beam, sootvetst and configuration of holes on the surface.

2. The method according to p. 1, characterized in that the controlled object is set in a different angular position about the horizontal axis.

3. The method according to p. 1, characterized in that the controlled object is set in a different angular position relative to the vertical axis.

4. Device for measuring the geometric parameters of the surfaces slozhnoprofilnyh objects containing buffet, consisting of a movable in a horizontal plane along the axes X and Y of the carriage, the actuator is equipped with sensors, linear displacement and the fixed base, which is rigidly connected vertical bracket, which is fixed to the optoelectronic head comprising a laser, optically coupled between a lens and an integrated photometric, the output of which is connected to the first input of the electronic unit of the primary signal processing, second and third inputs of which are connected with sensors, linear displacement of the movable carriage and the output to the input means of processing, recording and display of information which used PC, and mobile top rigidly mounted means for fastening the measured product, characterized in that in the center of the movable carriage on is connected to the fourth input of the electronic unit of the primary signal processing, and means for fastening the measured product is equipped with a rotary motor and the angle sensor, the output of which is connected to the PC.

5. The device according to p. 3, characterized in that the means for fastening the measured product is made in the form of a rotary table with angle sensor, the output of which is connected to the PC.



 

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