SU1412836A1 - Apparatus for controlling the process of bending - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in nuclear engineering and boiler making in the production of boiler coils. The goal is to expand the technological capabilities of the device while improving the accuracy of bending. The device contains a bending roller equipped with a drive, a drive and two rollers, one of which is mounted with the possibility of mixing in a plane perpendicular to the direction of movement of the workpieces, and the other on the axis of rotation of the guide roller. The device also contains position sensors of the rollers, the signals of which are fed to the control system of the bending mechanism, which makes it possible to increase the accuracy of bending using the actual current value of the bending radius taking into account the current value of the spring in a continuous bending process. 1 il. e (o

Description

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The invention relates to mechanical engineering, namely, the processing of metals by pressure, and can be used, in particular, in nuclear engineering and boiler construction in the production of boiler coils.

The purpose of the invention is to expand the technological capabilities of the device while simultaneously improving the accuracy of bending. I The drawing shows the functional layout of the device.

The bending process control unit contains a guide roller 1, a bending roller 2 equipped with a drive 3, a control unit 4 |, a bending roller drive, the output KJOToporo is connected to the input control of the drive unit 3, the bending radius setting unit 5 is connected b | y to the first input of the control unit 4, the date of the 6 position of the bending roller. I The device also contains additional 1 | 7, 8 rollers; in this case, roller 7 is mounted with the possibility of mixing in plane 1) and, perpendicular to the direction of movement (e- blanks 9 and guide rail passing through the axis of rotation). Roller 1. I The axes of the rollers 2, 8 are mechanically connected by Llanca 10 with the possibility of free rotation of the rollers around their axes. On the strip 10 perpendicular to the axis of the rollers 8, 12 there are fixed guides 11, 12 with the possibility of free rotation around the axes of the respective rollers . Stems 13, 14 are installed in rails I, 12 with the possibility moving along them. The rod 5 is located in a plane passing through the LH of rotation of the rollers 1.7s with the possibility of movement perpendicular to the axis of the rollers 1, 7. The ends of the rods 13, 14, 15 are mechanically connected with the possibility of free rotation of each of the rods 13, 14 around a common axis parallel to the axis of the directions of the uj.ero roller 1 in the planes perpendicular to this axis. The device contains a sensor: the position 16 of the first additional roller, the measuring elements of which are connected respectively to the guide 11 and the rod 13, keys 17, 18, connecting the exit sensors 6, 16, with the inputs of the control unit 4 with the condition of providing antiphase connection with respect to the first input, the comparison circuit 19, the first input of which is connected to the output of the sensor 16, and the second to the output of the sensor 6, the comparator 20, the first input of which is connected to the output of the comparison circuit 19, and the output to the control input of the switch 18 and, through an inverter 21 to the control input of the switch 17, the presetter 22 whose output is connected to the second input of the KOMPiapaTOpa 20, the drive 23 mechanically connected to the rod 15. The device includes also control unit 24,. the output of which is connected to the input of the actuator 23 of the rod, and the first input-to the setting device 5 of the bend radius, position sensors 25, 26, associated respectively with the rod 15 and the roller 7.

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The outputs of the sensors 25, 26 of the position of the roller of the guide roller and the additional roller are connected to the second and third inputs of the control unit 24 in antiphase relative to the input 1. Through the key 27, the setpoint 28 is connected to the fourth input of the control unit 4. The output of the device is the output of the comparison circuit 19.

The device works as follows.

Pre-position sensors 6, 16, 25, 26 are adjusted so that the output signals of sensors 6, 16, 25 correspond to the distance from the axis of rotation of the rods 13, 14 to the contact points of the bending roller 2, the additional roller 8, the guide roller 1 of the surface the workpiece 9, and the output signal of the sensor 26 is equal to zero when the rollers 1, 7 are closed.

On the setting device 5, the desired radius of the product is established, on the setting device 22 — the maximum springback value (determined experimentally by test bends), on the setting unit 28, the assumed springback value, determined on the basis of previous bends or experimentally.

The device is ready for operation. In the initial state, the output signal of the setting device 5, proportional to a given bending radius, goes to the first input of the control unit 24, the second and third inputs of which receive signals from sensors 25, 26. At the output of the control unit 24, a signal proportional to the deviation of the total signal of the sensors 25, 26 from the output signal of the setter 5. The actuator 23 processes the output signal of the control unit 24. In this case, the end of the rod 15 is set in a position in which the axis of rotation of the rods 13, 14 coincides with the center of the circle, described by a point lying on the surface of the workpiece, bent with the radius specified on the unit 5.

The output signals of the sensors 6, 16 are fed to the inputs of the comparison circuit 19. A signal proportional to the difference in the magnitudes of the signals from the sensors 16 and 6 appears at the output of the comparison circuit 19. The output signal of the comparison circuit 19 arrives at the first input of the comparator 20, the second input of which receives a signal proportional to the maximum springback value from the setting unit 22. Since the initial state of the workpiece 9 is not yet bent, then the output signal of the comparison circuit 19 exceeds the output signal of the setting device 22. At the output of the comparator 20, a high level signal is set. In this case, the keys 18, 27 are opened, and the key 17 is closed. The output signal of the sensor 6 through the public key 18 is fed to the second input of the control unit 4, the fourth input of which receives a signal from the setpoint 28 through

public key 27. In addition, the first input of control unit 4 receives a signal from setpoint 5, proportional to the specified radius of the product. In this case, the output of control unit 4 establishes a signal proportional to the deviation of the sum signal of sensor 6 and setpoint 28 from output signal of setter 5. Drive 3 processes the output signal of control unit 4, while bending roller 2 is set to the point of contact of the bending roller of the workpiece surface is located at a distance from the axis of rotation of the rods 13, 14, which are different for a given radius of the product, reduced by the amount of spring.

When the workpiece 9 moves in the direction from the direction of the roller 1 to the bending roller 2, it bends with a bending radius equal to the specified bending radius of the product, reduced by the amount of springback. After the curved part of the workpiece 9 leaves the bending roller 2, it is partially straightened and its radius increases. When the bent part of the workpiece gets under the roller 8, the difference between the output signals of the sensors 16, 6 becomes equal to the spring value and the output signal of the comparison circuit 19 proportional to this difference will trigger the comparator 20. A low level signal is set at the output of the comparator 20; In this case, the keys 18, 27 are closed, and 17 opens. H and the output signal of the sensor 16 through the public key 17 goes to the third input of the control unit 4. At the output of control unit 4, a signal appears that is proportional to the deviation of the actual radius of the product from the one set at unit 5. Drive 3, working out the output signal of control unit 4, acts on the bending roller 4, ensuring that the actual radius matches the specified one. At the same time, as the workpiece moves, a signal is formed at the output of the comparison circuit 19, which is proportional to the current value of the spring, arriving at the device output. This signal provides information about the non-uniformity of the mechanical properties of the workpiece along its length, and also allows you to determine the amount of springback.

The invention makes it possible to control the process of bending according to the actual current value of the product radius, which increases the accuracy of bending even with non-uniformity of mechanical properties along the length of the workpiece.

Claims (1)

Invention Formula A bending process control unit comprising a bending roller with a drive, the input of which through its control unit is connected to a bending radius setting unit, a bending roller position sensor, a guide 0 S 0 5 0 five 0 five Roller dvg key, characterized in that, in order to expand technological capabilities while improving the accuracy of bending, it is equipped with the first additional roller placed behind the bending roller in the course of the technological process mechanically connected by means of a bar with a bending roller with the possibility of free rotation of the rollers around their axes, the first and second guides placed on the p.; anchor ring - the axis of the rollers with the possibility of free rotation around the axes of the respective rollers, the first and second m rods installed in the respective guides with the possibility of free movement along the guides, the second additional roller mounted to the bending roller in the course of the process in a plane perpendicular to the axis of the workpiece passing through the axis of the guide roller and corresponding to the beginning are flexible with the possibility of movement in this plane, and the axes of all the rollers are parallel, we pull the rod located in the plane passing through the axes of the right and second and second rollers with The possibility of moving in this plane in the direction perpendicular to the axis of the guide roller, the ends of the rods are mechanically connected with the possibility of rotation of the first two rods around an axis parallel to the axis of the guide roller in planes perpendicular to this axis, the device is also equipped with three position sensors of additional rollers and the third rod of the guide roller, the limiters of the maximum and nominal values of the spring, the third key, the inverter, the comparison circuit, the comparator, the drive control unit In this case, the position sensor of the first additional roller is connected via the first key to the second input of the bending roller drive control unit, to the third input of which the output of the bending roller position sensor is connected via the second key, the fourth input through the third key to the setpoint 1 output spring value, the setpoint adjuster of the maximum springback value is connected via a comparator to the control inputs of the second and third keys and through an inverter with a control input. the first key, the second input of the comparator is connected to the output of the comparison circuit, two inputs of which are connected respectively to the outputs of the position sensors of the first bending additional rollers, the output of the bend radius setting device is connected to the first input of the third drive control unit; the current and the second and third inputs are connected to the outputs position sensors of the second additional roller and third third stream.