Shears for sheet material

FIELD: plastic working of metals, possibly in rolling mill lines for cross cutting of metallic sheets.

SUBSTANCE: shears include mounted in housing lower support in which stationary straight cutter is arranged; drive upper support; cylinder whose body is secured to lateral surface of housing; control system. Shears are provided with additional cylinder whose body is jointly secured to opposite lateral surface of housing. Rods of said cylinder and of additional cylinder are jointly coupled with upper support. Motion drive of upper support is in the form at least of two hydraulic cylinders jointly coupled with upper part of housing and having rods jointly secured to upper support. Control system includes units providing movement of rods of all said cylinders for creating possibility for moving upper support according to preset law.

EFFECT: increased efficiency of shears at simultaneous simplification of their structure.

4 dwg

 

The invention relates to the processing of metals by pressure and can be used in the lines of rolling mills for the transverse separation of the metal sheets.

Known shears for cutting sheet material according to French patent No. 2521469, 23D 15/08, 15/14.

In the frame of the shears are driving the upper support plate carrying the arcuate upper knife and a stationary lower support plate fixed it straight bottom with a knife. Drive the upper caliper made in the form of hydraulic system comprising two hydraulic cylinders intended for messages arcuate knife vibrational motions.

At the free ends of cylinders placed rollers, mounted in the slots of the upper support plate. Both hydraulic cylinders are connected by system management software, which is designed to ensure overlap of the cutting edge of the rolling curved knife on an imaginary plane located at a distance of overlap Δ from the cutting edge of the fixed knife. In the case of positive values overlap Δ imaginary plane will be below the cutting edge of the fixed knife, and in the case of negative values overlap Δ imaginary plane will be above the cutting edge of the fixed knife. The magnitude and sign of the overlap of temperature-dependent mechanical properties and thickness of the metal, which is the first to be cut.

Work with scissors in the following way.

Before performing cutting configure scissors depending on the thickness of the sheet, the lower linear knife is always at a distance of about 1-2 mm below the level of transportation of the sheet, the upper arcuate knife set at a desired upper position by means of a hydraulic actuator upper caliper. The control system of hydraulic cylinders, coordinating oscillatory movement of the upper support plate allows you to install curved knife in such a way that its one end is located with a minimum clearance relative to the upper level of the sheet, and the second is remote from the sheet at a greater distance. Arcuate knife set so that the minimum clearance does not obstruct free placement of the sheet to be cut.

The vehicle, for example, move the sheet metal in the area of cutting shears and stop it after placing between arched and straight knife. Next, the command control system to move the cylinders of the upper support plate so that as a result of their movement made possible the implementation of a rolling cut the curved top of the knife relative to the lower straight knife. However, starting the cut metal on one side of the sheet and rolling on a set of Trac the Oria, arcuate knife sequentially cuts the sheet across its width.

At the completion of cutting of the sheet lower linear knife is in contact with the second end of the arcuate upper knife that cut was more remote from the surface of the sheet. When performing the cut sheet referred scissors rollers placed at the ends of the moving cylinder, move freely in the respective grooves of the upper support plate carrying a curved knife.

Under the influence of the horizontal component of the cutting forces arcuate upper knife moves in a direction not coinciding with the direction of the cut, causing the slippage of the cutting edge curved knife on cut sheet, which causes additional wear on the knife, reduces its longevity and durability of the scissors as a whole.

Thus, the disadvantage of the described construction of the scissors is unsatisfactory durability.

Known also design shears for cutting sheet material in English patent No. 1067920, 23D, figures 9, 10, closer to the claimed solution and adopted as a prototype.

The scissors include a frame placed in her bottom and the top of the calipers. In the lower support plate fixedly mounted straight bottom knife, and drive the upper caliper fixed pobrany upper knife. To the side surfaces of the upper support rollers attached. On the side walls of the bed are copiers. Working surfaces of each of the copiers is made curved, the shape of the curve follows the curvature of the trajectory, which describes each point of the knife during its movement when cutting sheet. In this case, the shape of this curve is part of the cycloid. Each of the copiers installed with the opportunity to interact with the rollers of the upper support plate. One of the copiers is rigidly attached to the frame, and the second attached to it hinged at one end and the other articulated with the rod of the cylinder is placed in the frame.

The drive of the upper support plate is made of Electromechanical, and connecting rods articulated to the upper caliper. The drives scissors coordinates the system management software. Scissors are equipped with a mechanism for vertical movement of the upper frame in conjunction with an Electromechanical drive.

Scissors work the same way as described above. Before cutting, depending on the thickness of the upper arcuate knife set with respect to the lower knife, placed 1-2 mm below the level of transportation of the sheet with the gap, providing him a free pass. After placing the sheet in the cut zone at the command of the control system drives scissors Electromechanical PR is Bodom move the upper support plate with a curved knife, the upper knife, effecting swinging movement in a predetermined path, together with the lower knife cuts the sheet. During Reza simultaneously with the movement of the upper support its rollers roll on the working surface of the copier, with the hinge attached to the copier upper carriage rollers tightened to a working surface of a copier, fixedly mounted in the frame, in the direction of the horizontal component of the cutting forces. This prevents unwanted movement of the upper arcuate knife on cut sheet, which eliminates slippage, reduces wear and increases the durability of the knife and the durability of the scissors as a whole.

When cut another sheet thickness mechanism for moving the upper caliper reset to its original position, at which the minimum clearance between the arcuate knife and rollers of the transport roller provides free placement of the sheet for cutting.

Compared to similar this design shear provides cutting sheet material without slipping the top of the knife relative to the workpiece surface, thereby increasing the durability of the arcuate knife and increasing the durability of the scissors as a whole.

However, this design Noni which allows to cut sheet metal from one of the original positions of the upper arcuate knife. So after every cut you need to use rods Electromechanical actuator to move the arcuate upper knife to its original position, taking the time for this operation, and then perform the next cut.

The time required for removing the top of the knife to its original position, increases the set-up component time, which is the sum over time of a cut is the total time of the process cycle, which leads to poor performance shears for cutting sheet material. The presence in the Electromechanical drive a significant number of nodes, connections between them (motor, gearbox, couplings, rods, copiers, etc.) complicates the design of the scissors. In addition, difficult to manufacture and curved working surface of the copier, which also complicates the design of the scissors.

Thus, the lack of scissors, taken as a prototype, is the low productivity in increased design complexity.

The basis of the invention the task performance shears for cutting sheet material with simultaneous simplification of the structure.

This task is solved by the technical result, which consists in reducing the time of preparation of scissors to perform the cut.

To achieve the specified technology is centred on the scissors for cutting sheet material, includes installed in the frame bottom support plate with fastened it fixed straight knife, drive the upper support plate, a cylinder housing which is attached to the side surface of the frame, and a control system according to the invention is provided with an additional cylinder, the body of which is pivotally attached to the opposite side surface of the frame, while stocks mentioned cylinder and the additional cylinder is articulated with the upper support plate and the actuator moving the upper caliper made in the form of at least two articulated to the upper part of the base of the cylinders, the piston rods are pivotally connected with the upper support plate, with the control system includes means providing dependent movement of the rods all mentioned cylinder to allow movement of the upper support plate according to a given law.

In the comparative analysis of the proposed technical solution and prototype established that they have the following common features:

- base;

- accommodation in the frame of the bottom of the caliper with the installed fixed straight knife;

- accommodation in the frame of the drive of the upper support plate fixed therein arcuate knife;

the cylinder housing which is attached to the side surface of the base;

- the system is driven by the I;

and distinguishing features:

- supply of scissors additional cylinder, the body of which is pivotally attached opposite the first cylinder to the side surface of the base;

- articulation of the cylinder attached to the side surfaces of the frame with the upper caliper;

- execution of the drive movement of the upper support plate in the form of at least two articulated to the upper part of the base of the cylinders, the rods of which are connected with the upper caliper;

- the inclusion in the system management tools that provide dependent movement of the rods all mentioned cylinder to allow movement of the upper support plate according to a given law.

Thus, shears for cutting sheet material have new nodes, new forms of execution nodes, new links between nodes and components.

Between the features and achievable technical result there is a causal relationship.

Due to the fact that the shears for cutting sheet material provided with an additional cylinder attached to the side surface of the frame, and also due to the fact that the cylinder rods attached to the side surfaces of the frame, articulated with the upper support plate and the actuator moving the upper caliper made in the form of at least two pivotally attached to the top of the it part of the base of the cylinders, the rods are articulated to the upper support plate, and also due to the fact that the control system includes means providing dependent movement of the rods all mentioned cylinder to allow movement of the upper support plate according to a given law, it has become possible, providing retention of the upper curved knife from displacement under the influence of the horizontal component of the forces during cutting to perform cutting on either side of the knife (i.e. after completion of the cut, you only need to move the caliper with a curved knife vertically, creating the minimum required clearance for the passage of the sheet, and start a new cut from the knife, which was completed the previous operation cutting of the workpiece), which allows to reduce the number of preparatory operations associated with the return of upper caliper scissors after cutting to its original position, to reduce set-up time of the technological cycle, which leads to improved performance of scissors while simplifying the design by reducing the total number of nodes and components in comparison with the prototype, included with scissors.

The exception to the above combination of distinctive features of at least one does not ensure the achievement of technicalagricultural.

The claimed technical solution is not known from the prior art, because it is new.

The proposed solution involves an inventive step, because for the specialist, it does not follow from the prior art.

The claimed technical solution is industrially applicable because of its technical and technological performance, e.g., NKMZ is not difficult.

Using the inventive design of the scissors made technical project for OOO Stahlservice-TL", Togliatti.

Thus, the claimed technical solution may be represented by legal protection, because it is new, involves an inventive step and is industrially applicable, i.e. meets all the criteria of the invention.

The claimed technical solution is illustrated by drawings, which depict the following:

figure 1 - scissors for cutting sheet material;

figure 2 - section a-a of figure 1;

figure 3 - scissors for cutting sheet material with a variant of the hinge fixing cylinders on the sides of the bed;

figure 4 - hydraulic control system the hydraulic cylinders of scissors.

Scissors for cutting sheet material includes a frame 1 mounted therein a stationary lower support plate 2 and a movable upper support plate 3. On the upper crossbar of the frame 1 hinge set hydroc Landry 4 and 5, the rods which are connected with the upper support plate 3. On opposite side surfaces of the base 1 set 6 cylinder and the additional cylinder 7, the rods are articulated to the upper support plate 3, for example, with its lateral surfaces. On the stationary lower support plate 2 is fixed straight knife 8, and the movable support plate 3 is fixed arcuate knife 9. The composition of scissors includes a control system that includes the following elements: serverspecific 10 and 11, connected to the hydraulic cylinders 4 and 5, respectively, the linear displacement sensors 12 and 13 for controlling the current provisions of the rods 14 and 15 of the hydraulic cylinders 4 and 5 and installed on them. Serverspecific 10 and 11 are designed to control the movement of the rods 14 and 15 of the hydraulic cylinders 4 and 5 depending on the valve position corresponding servers.properties 10 or 11. The cylinders 6 and 7 are connected with servers.properties 16 through the pipe system 17, containing the valves 18, 19, 20, 21 having, for example, electromagnetic control. To control the current position of the rods 22 and 23 of the cylinders 6 and 7 are the linear displacement sensors 24 and 25 mounted on the cylinders 6 and 7, respectively. Serverserial 16 and valves 18, 19, 20, 21 are designed to control the movement of one of the rods 22 or 23 of the cylinder 6 or 7, while the second is C-mentioned rod is connected to the discharge line of the pump station 26.

The rods 22 and 23 of the cylinders 6 and 7 can be coupled to the upper support plate 3, for example, hinge, as shown in figure 1, in this case referred to the cylinders 6 and 7 is also pivotally attached to opposite side surfaces of the base 1. In addition, a possible variant, in which the free ends of the rods 22 and 23 are equipped with rollers that are designed for contact with the side surfaces of the upper support plate 3 and the cylinder housing 6 and 7 are rigidly secured to opposite side surfaces of the base 1 (variant shown in figure 3). Type of coupling rods 22 and 23 with the upper support plate 3 a significant value for the task is not, therefore, the claims are not made.

Work with scissors for cutting sheet material as follows.

Initially, the upper support plate 3 is in the position corresponding to the maximum disclosure of the knives 8 and 9 to accommodate the maximum sheet thickness, with the upper arcuate knife 9 is set so that the clearance between its edges and the roller guide roller are the same (figure 4). After entering in the system management data about the thickness of the sheet material to be cross-cutting, all the cylinders of the scissors are driven, in which the upper support plate 3 with curved top with a knife 9 is set in a position in which, for example, the R, the gap between the left edge of the upper curved knife 9 and the lower straight knife 8 is the minimum for the free accommodation of the sheet material. While the gap between the right edge of the upper knife 9 and the rollers of the roller conveyor will be greater than the gap at the left end. When this command from the system control serverspecific 10, 11 control the movement of the rods 14, 15 of the hydraulic cylinders 4 and 5, respectively, and serverserial 16 controls the movement of the rod 2 of the cylinder 6 by the given law. To implement the desired motion of the valves 18 and 19 connect the cylinder 6 with servers.properties 16, the valves 20 and 21 connect the cylinder 7 to the discharge line of the pump station 26.

The algorithm that determines the position of the hinge joints of the rods 14, 22 with the upper support plate 3 (point a on figure 4), as follows:

where R is the radius of the upper knife;

r is the radius of the point A;

r1is the radius of the point In;

ϕ - the current value of the rotation angle of the upper caliper;

ϕ0- the initial corner point A;

- the initial corner point of the Century

The formula for determining the positions of the connection points of the rods 15, 23 to the upper support plate 3 are views, similar to the following system of equations taking into account marks before φ0.

But the instructor is ready to perform the cut. The rollers of the roller conveyor to transport the sheet metal in the area of scissors and stop it in the cutting zone between the upper arcuate knife 9 and the lower straight knife 8. Of the control system receives a command to move according to the law of all cylinders of scissors, and happen activate the devices in the sequence, similar to that described above. In this control system, coordinating the movement of the rods 14, 15 of the hydraulic cylinders 4, 5 and rods 22, 23 of the cylinders 6, 7, leads them to a consistent movement, providing the movement of the upper support plate 3 with the knife 9 according to a given law, when cutting the workpiece by cutting in sheet metal upper knife 9, starting from its left edge to the right, overlapping Δ they lower knife 8 after completion of the cut in each section. The amount of overlap Δ depends on the thickness of the material being cut. Move the rod of the cylinder scissors agreed by the control system so that the cut sheet was rolling cut without slipping the upper arcuate knife 9 on the cut sheet. That is, each movement of the rods 14, 15 of the hydraulic cylinders 4, 5 is accompanied by a corresponding movement of one of the rods 22 or 23 of the respective cylinders when the preload piston rod of the second cylinder, PR is fastened to the opposite side of the base 1 with the aim of sampling gaps between the rods 22, 23 and the side surfaces of the upper support plate 3. This will prevent displacement of the arcuate cutting edge of the upper knife 9 relative to the material being cut under the action of the horizontal component of the cutting forces in a direction not coinciding with the direction of the cut, i.e. eliminate slippage of the upper knife for the entire period rolling cut-to complete the cutting of the sheet. At the end of the cutting gap between the left edge of the upper curved knife 9 and the lower straight knife 8 exceeds the gap at the right edge of the knife 9. After cutting at the command of the control system by performing the previously described operations of the upper support plate 3 is lifted up to create a minimal gap between the right edge of the knife 9 and the rollers of the roller conveyor to skip the next section of the list to be cut. After the filing of the sheet in the area of new knives cut starts with the right edge of the upper knife 9, i.e. from the end position of the upper knife 9, you can start the next cut, thus eliminating the operation to return the knife to its original position cut, as the cut is performed with the right edge of the upper knife 9 and the left edge.

The cutting process is repeated as described achiev with the left edge of the knife.

From the foregoing it is seen that the performance of scissors for cutting sheet material in accordance with the formula izopet the deposits reduces the number of preparatory operations, associated with the configuration of scissors to reduce set-up component time process cycle, thereby increasing the performance of scissors while simplifying their design.

Scissors for cutting sheet material including mounted in the frame bottom support plate with fastened it fixed straight knife, drive the upper caliper, hydraulic cylinder, the body of which is attached to the side surface of the frame, and the control system, characterized in that they are equipped with an additional hydraulic cylinder, the body of which is pivotally attached to the opposite side surface of the frame, while stocks mentioned hydraulic cylinders pivotally coupled to the upper support plate and the actuator moving the upper caliper made in the form of at least two articulated to the upper part of the base of the cylinders, the piston rods are pivotally connected with the upper support plate, with the control system includes a means of providing dependent movement of the rods of all the above-mentioned hydraulic cylinders for movement of the upper support plate according to a given law.



 

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The invention relates to the cutting of sheet material and can be used in the procurement departments of engineering companies

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FIELD: plastic working of metals, possibly in rolling mill lines for cross cutting of metallic sheets.

SUBSTANCE: shears include mounted in housing lower support in which stationary straight cutter is arranged; drive upper support; cylinder whose body is secured to lateral surface of housing; control system. Shears are provided with additional cylinder whose body is jointly secured to opposite lateral surface of housing. Rods of said cylinder and of additional cylinder are jointly coupled with upper support. Motion drive of upper support is in the form at least of two hydraulic cylinders jointly coupled with upper part of housing and having rods jointly secured to upper support. Control system includes units providing movement of rods of all said cylinders for creating possibility for moving upper support according to preset law.

EFFECT: increased efficiency of shears at simultaneous simplification of their structure.

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