SU1202655A2 - Device for counterbending rolls - Google Patents

Description

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The invention relates to the field of rolling production, can be used on continuous strip mills and is an improvement of the device according to (main bus no. 768513.

The purpose of the invention is to improve the accuracy and flatness of rolled strips.

The drawing shows a block diagram of the proposed device.

The device contains hydraulic cylinders 1, pillows 2 of the lower work roll 3, plungers 4, pillows 5 of the upper work roll 6, hydraulic circuit 7, Pump 8, fluid pressure regulator 9, transverse thickness gauge 10, pressure correction block P, which is a proportionality block , the sensor 12 of the position of the strip in front of the cells the sensor 13 of the presence of metal in the deformation zone of the stand, the adder 4, the first multiplication unit 15, the second multiplication unit 16, the first memory unit 17, the second memory unit 18, the metal detector 19 in the source deformations previous in the rolling direction of the cage, the sensor 20 of the presence of metal in the deformation zone after the rolling direction of the cage.

The hydraulic cylinders 1 are embedded in the pads 2 of the lower work roll 3. The plungers 4 mate with the pads 5 of the upper work roll b

The hydraulic cylinders 1 are connected by a hydraulic line 7. with a pump B, which is a source of fluid pressure, and with a fluid pressure regulator 9, intended to change the magnitude of the fluid pressure, and hence the anti-bending value of work rolls 3 and 6.

The fluid pressure regulator 9, besides the hydraulic connection with the hydraulic cylinders 1 and the pump 8, is in electrical communication with the transverse thickness gauge 10 and the pressure correction unit 11. In this case, the connection of the second input of the pressure regulator 9 with the output of the pressure correction unit 11 is not performed directly, as in the known device, but through the adder 14, i.e. The second stroke of the pressure regulator 9 is connected to the output of the adder 14, the first input of which is connected to the output of the pressure correction unit 11. Second entrance sum25

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Mat 14 is connected to the output of the first multiplication unit 15, its third input is connected to the output of the second multiplication unit 16. The first input of the first 5 memory block 17 is connected to the strip position sensor 12 in front of the cage, its second input is connected to the metal detector 20 in the deformation zone of the next cage. The first input 10 of the second memory block 18 is connected to the sensor 19 of the presence of metal in the deformation zone of the previous stand, and its second input is connected to the sensor 13 of the presence of metal in the deformation zone of the stand. 15 The output of the first memory block 17 is connected to the input of the first multiplier 15, the output of the second memory block 18 is connected to the input of the second multiplication unit 16,

20 The device operates as follows.

When the strip approaches the rolling stand, position sensor 12 sends a signal to pressure correction unit 11, which generates a signal proportional to the sum of the calculated fluid pressure during rolling of the middle part of the strip and the dynamic bending pressure drop when the strip is caught by the rollers.

From the output of the first memory block 17, a command from sensor 12 to the input of the first multiplication unit 15 receives a signal of a predetermined front line 35 in the gap between the regulating and the subsequent cells. In block 15, the front tension signal is multiplied by a coefficient corresponding to the profile size of the rolled 40 strip. The values of the coefficients for the various strip size profiles are determined experimentally or calculated before rolling. The resulting signal from the output of block 15 arrives at the second input of the adder 14,. where it is added to the signal received at its first input from the output of the correction unit I1. The sum signal from the output of the adder 14 is fed to the 50 second input of the pressure regulator 9. As a result, the regulator 9 increases the pressure in the hydraulic cylinders 1 of the bending from a value equal to the balancing force of the upper work roll 55 of the roll 6 to a value equal to the sum of the calculated pressure of the opposite pressure during rolling the middle part of the strip

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the pressure drop during the seizure of the strip by the rollers and pressure to compensate for the effect of the absence of front tension.

At the moment of the capture of the strip by the rollers of the regulating stand, the stand is elastically stretched by the rolling force, the working volume in the hydraulic cylinders 1 of the bend increases and the pressure of the bend spontaneously decreases to a value equal to the sum of the calculated bend pressure during rolling of the middle part of the strip and compensated by the lack of front tension. At the same time, according to the signal from the sensor 13, the presence of metal in the deformation zone, the pressure correction unit 11 reduces the signal at its output in proportion to the magnitude of the dynamic pressure drop during trapping. As a result, a signal is received from the output of the adder 14 to the input of the pressure regulator 9 equal to the sum of the calculated pressure during rolling the middle part of the strip and pressure to compensate for the absence of front tension, i.e. simultaneously with spontaneous pressure drop in the hydraulic cylinders 1 of the bend when the strip is caught by the rollers, the setpoint of the pressure regulator 9 decreases by the same amount,

During rolling, the front section of the strip without tension in the cylinders 1 of the rolls bending acts a pressure equal to the sum of the calculated pressure during rolling the middle part of the strip and the pressure to compensate for the effect of the absence of front tension. At the moment of the seizure of the strip by the rollers of the next, the stand, the front tension of the strip occurs. The signal of the sensor 20 for the presence of metal in the deformation zone of the subsequent cell stops the front tension signal from the memory block 17 to the multiplication block 15. As a result, the signal at the output of the adder 14 is reduced by the amount of pressure to compensate for the absence of front tension, and the pressure regulator 9 reduces the pressure of the fluid in the hydraulic cylinders 1 of the bend to a value equal to the calculated value when rolling the middle part of the strip.

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The middle part of the strip is rolled at the calculated pressure value of the bend. When a transverse heterogeneity appears above the tolerance by a signal from the transverse heterogeneity measurement unit 10, the regulator 9 changes the calculated bending pressure to the side of the mismatch.

) 0 At the moment when the strip leaves the previous stand, the rear tension of the strip disappears. The signal of the sensor 19 the presence of metal in the deformation zone of the previous stand from the output of the second

15, the memory unit 18, to the input of the second multiplication unit 16, receives a signal proportional to the rear tension, with which the strip has rolled before it leaves the previous stand. AT

2Q in block 16, the rear tension signal is multiplied by a coefficient corresponding to the profiler of the rolled strip, and the resulting signal from the output of block 16 is fed to the third input of adder 14, where it is added to the signal from correction block 11, the total signal from the output of adder 14 is fed to the second input pressure regulator 9. As a result, the regulator 9 increases the pressure in the hydraulic cylinders 1 of the bend by an amount necessary to compensate for the effect of the absence of back tension.

During the rolling process of the back section of the strip without tension, the hydraulic cylinders 1 of the bend act with a pressure equal to the sum of the specified pressure value during the rolling of the middle part of the strip and the pressure to compensate for the effect of the absence of the rear tension. At the moment when the strip leaves the control stand rolls, the signal of the sensor 13 for the presence of metal in the deformation zone of the stand stops the back tension signal from the second memory unit 18 to the second multiplication unit 16, and the pressure correction unit 11 reduces the signal by the specified rolling pressure parts of the strip. As a result, the regulator 9 reduces the bending pressure to the equilibrium value of the upper work roll 6.

When the next band approaches

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sensor 12, the cycle of operation is repeated.

Editor O. Vugir

Compiled by Yu. Rybyev

Tehred T. Tulik Corrector I. Muska

Order 8350/8 Circulation 548 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/3

Branch PPP Patent, Uzhgorod, st. Project, 4

Claims (1)

(57 ^ ROLL BENDING DEVICE according to ed. No. 768513, characterized in that, in order to increase the accuracy and flatness of the rolled strips, it additionally contains an adder, two multiplication units, two memory units, a metal detector in the deformation zone of the previous stand and a sensor for the presence of metal in the deformation zone of the subsequent stand, the output of the pressure correction unit being connected to the first input of the adder, the second and third inputs of which are connected respectively to the outputs of the multiplication units, the first input of the first memory unit is connected to with a strip position indicator in front of the stand, and its second input with a metal presence sensor in the deformation zone of the subsequent stand, the first input of the second memory block is connected to the metal presence sensor in the deformation zone · of the previous stand, and its second input - with the metal presence sensor in the center deformation of the stand, and the outputs of the first and second memory blocks are connected to the inputs of the multiplication blocks, the output of the adder is connected to the second input of the pressure regulator.