SU995948A2 - Apparatus for counterbending of rolls - Google Patents

Description

(54) ROLLER ANTIFICATION DEVICE

The invention relates to rolling production, can be used in strip mills for hot and cold rolling.

According to the main author. St. No. 768513, a roll bending device is known, which includes hydraulic cylinders for spreading work roll cushions, a source of working fluid pressure, a pressure regulator, a correction unit, a transverse thickness gauge, a metal spacing sensor in the deformation zone, and a strip position sensor in front of the cage. At the same time, the output of the transverse gauge gauge and the output of the pressure correction unit are connected respectively to the first and second inputs of the pressure regulator, the output of which and the output of the working fluid pressure source are connected to the hydraulic cylinders of the work roll cushions, and the output of the position sensor the strips in front of the cage are connected respectively to the first and second inputs of the correction unit flj.

In the process of operation of the device, before entering the strip into the stand, the pressure of the bending is set higher than

This is required directly when rolling the strip, by the value of the dynamic pressure drop when the strip is seized by the rollers, which is calculated for each batch of one standard size of the strip, based on the nominal thickness, width, temperature, steel grade of the strip, amount of reduction, rigidity of the stand, and rigidity of the hydraulic cylinders. . However, the calculated value of the dynamic pressure drop when the strip is caught by the rollers, which is calculated for each batch of one strip size, based on the nominal thresh, the width, temperature, steel grade of the strip, the amount of reduction, the rigidity of the stand, the stiffness of the hydraulic cylinders of the thrust cylinders, differs from the actual value pressure drop

20 to 5-20%. The known device does not take into account this deviation. As a result, at the time of strip rolling with a roll, the pressure of the bending does not fall to the value required during rolling.

25, and to a value that differs from it by the deviation of the actual pressure drop from the calculated pressure drop when the strip is seized by the rollers, it increases the transverse thickness difference and non-flatness of the front portion of the strip that rolls during the time interval dg for which the signal The sensor for the presence of metal in the deformation zone; the correction unit changes the setpoint of the pressure regulator, and the regulator changes the pressure to the value required during the strip rolling. The purpose of the invention is to improve the rolling accuracy. The goal is achieved by the addition of a fluid pressure sensor, a memory unit and a reference element to the device, while output;} a fluid pressure sensor is connected to the information input of the memory unit, the first and second control inputs of which are connected respectively to the outputs the position sensor of the strip in front of the stand and the sensor for the presence of metal in the deformation zone, and its first and second outputs are connected respectively to the first and second inputs of the reference element, the output of which is connected to the third input of the correction unit pressure. FIG. 1 shows an embodiment of the device according to the invention; FIG. 2 shows the structure of the pressure correction unit. The hydraulic cylinders 1 are embedded in the cushions 2 of the lower working roll 3. The plungers 4 are mated to the cushions 5 of the upper work roll 6. The hydraulic cylinders 1 are connected by hydraulic actuator 7 to a pump 8, which is a source of fluid pressure and a regulator 9 of liquid pressure, intended for changes in the magnitude of the pressure of the fluid, and consequently, the magnitude of the effort to counter the bending of the rolls 3 and 6.. The fluid pressure regulator 9, besides the hydraulic connection with the hydraulic cylinders 1 and the pump 8, has electrical connections with the transverse thickness gauge 10 and the pressure correction unit 11. The pressure correction unit 11, in turn, is electrically connected by its second inlet to a strip position sensor 12 in front of the stand, designed to detect the presence of a rolled strip in front of the stand, and its first input is connected to the metal presence sensor 13 in the deformation zone. A fluid pressure sensor 14, designed to measure the fluid pressure in the hydraulic cylinders 1 of the bending of rolls 3 and 6, is connected via its output to the information input of the memory unit 15. The first and second control inputs of the memory unit 15 are connected by the Q outputs of the strip position sensor 12 in front of the stand and the metal presence sensor 13 in the deformatski center, respectively. The first and second outputs of the memory unit 15 are connected to the first and second inputs of the comparison element 16, respectively. The output of the comparison element 16 is connected to the third input of the correction unit 11. Block 11 includes a proportional amplifier 17, an adder 18, a counting cell 19, keys 20-23. The device works as follows. When the strip approaches the rolling stand, the strip position sensor 12 in front of the stand commands the pressure correction unit 11, which generates a signal proportional to the sum of the calculated bending pressure during rolling of the strip and the calculated dynamic bending pressure drop at the strip capture by beams coming from the computing device {not shown). Key 20 is closed when there is no signal at its control input and is open when there is a signal. Keys 21 and 22 are open when there is no signal at the control input and are closed when there is a signal. The key 23, when there is no signal at the control Input, is closed for the signal q, (the calculated value of the dynamic pressure drop of the anti-bend when the strip is caught by the rollers), and is open for the signal Pfo, (the actual value of the dynamic pressure drop of the bend by the rolls). When there is a signal at the control input, key 23 is open for the signal qp and closed for the signal q ,,. Before the strip approaches the sensor 12, i.e. Before the signal from sensor 12 arrives, the keys 21 and 22 are open, so only signal q arrives at adder 18 (counterbalancing pressure of the upper work roll). When the first strip of the rolled batch of strips approaches the stand, the strip position sensor 12 in front of the stand sends a signal to the information input of the key 20 and the control input of the key 22 Since the key 20 is closed (there is no signal at its control input), the signal from the sensor 12 through the key 20 enters the control key input 21, closes it. Since, in this case, the key 14 is closed for the J signal qn (there is no signal at its control input), then through the keys 23 and 21, the signal Qp is fed to the input of the adder 18. In addition, when the key 22 arrives at the control input from the sensor 12, the key 22 closes and the signal qpp passes through it to the input of the adder 18 (the calculated value of the anti-bend pressure during strip rolling). In the adder 18

all three quantities are summed, and from its output the signal q −f qp, + q is fed to the input of the proportional amplifier 17, which forms the key signal, where k is the proportionality coefficient.

Thus, from the output of the proportional amplifier 17, which is also the output of the pressure correction unit 11, when the first strip of the rolled batch of strips approaches the stand of the sensor 12, the regulator 9 receives a signal

q-, + qpn).

at the moment when the strip is caught by the rollers, the signal from the sensor 13 of the presence of metal in the deformation zone enters the control inputs of keys 21 and 22 and the counting cell 19. In this case, the key 20 opens, and the signal from sensor 12 does not pass through it to the control input of key 21, Key 21 is disconnected, and the signal goes to adder 18. Therefore, the proportional amplifier 17 from adder 18 receives a signal and Jaur + q pn. As a result, block 11 reduces the setpoint of control of regulator 9 from k (q + + qpj + Qpn) to k ( q ,, p + qp).

When the rear end of the strip leaves the zone of the sensor 12, the key 22 remains closed, since its control input has a signal from the sensor 13. When the rear end of the strip leaves the stand, the signal disappears at the control input of the key 22 and the input of the counter cell 19, which entered from sensor 13. Key 22 opens, and no signal is received to the adder. Thus, when the rear end of the strip leaves the cage, the block 11 again reduces the pressure setting of the regulator 9 by (q, .p + Ipj,) TO values.

In addition, when the rear end of the strip leaves the stand, the counting cell 19 registers the end of the rolling of the first run of the lot, and a signal is generated at its exit that remains when rolling all subsequent lanes of the runs. The signal from the output of counter cell 19 is fed to the control input of the key 23 and translates it into the state in which it is open for the n-g signal. closed for signal.

When approaching the sensor 12 of the second strip of the rolled batch to the adder 18 through the keys 23 and 21, instead of the signal Pr comes from the comparison element 16, the signal f}, as a result, block 11 changes the setpoint of the regulator 9

from to k {n, p +, qpp

When the second strip enters the stand, block 11 works in the same way as when rolling the first strip, i.e. reduces the pressure setpoint of regulator 9 to the value of k (q rp) / e when the rear end of the strip exits the signal of sensor 13 to the value. kqvjp.

When rolling the subsequent lanes, the cycle of operation of block 11 is repeated.

From the output of the correction block 11, the signal enters the regulator 9, which increases the pressure in the hydraulic cylinders 1 of the bending from a value corresponding to the balancing force of the upper work roll b to a value corresponding to the sum of the calculated value of the force of the bending during rolling of the strip and the calculated dynamic drop

5 forces of bending when seizing the strip with rollers.

From the sensor 14, the information input of the memory block 15 receives information about the actual pressure value in the hydraulic cylinders 1. As the first control input of the memory block 15 as the strip approaches the sensor 12, it receives a signal that is a command signal for recording minan, the memory block 15 stores the new steady-state value of the fluid pressure, corresponding to the sum of the calculated value of the rolling pressure of the strip and the calculated value

0 dynamic pressure drop during strip capture. This memorized pressure value from the first output of the memory unit 15 is fed to the first input of the reference element 16.

five

At the moment of the capture of the strip by the rolls, the stand is elastically stretched by the rolling force, the working volume in the hydrocylinders 1 increases, due to which the pressure of the fluid in them

0 is reduced by the magnitude of the dynamic drop. In this case, if the calculated value of the dynamic pressure drop is equal to the actual one, then the new pressure value corresponds to the calculated value of the pressure

5 anti-bend when rolling strip.

Since the actual value of the dynamic pressure drop is, as a rule, not equal to the calculated one, the new steady-state value of pressure

0 differs from the required pressure when rolling the strip. This new pressure value in the hydraulic cylinders 1, according to the signal from the sensor 13, which arrived at the second control input of the unit 15 m3, is stored by the memory unit 15 and from its second output goes to the second input of the comparison element 16, where it is compared with the signal received at his first entry. Signal

0 the difference is equal to the actual value of the dynamic pressure drop of the liquid in the hydraulic cylinders 1 when the strip is caught by the rollers;

At the time of capture of a strip of roll ti

5, the signal from sensor 13 is also supplied.

and in the pressure correction unit 11, which reduces the pressure setting of the regulator 9 to the calculated pressure required for rolling the strip. Over a period of time D t, the fluid pressure in the hydraulic cylinders 1 changes from a value equal to the sum of the calculated rolling pressure and the deviation of the actual value dynamic pressure drop from the calculated value of the dynamic drop to the calculated value of the pressure during rolling of the strip.

When a transverse thickness difference arises according to the signal from the transverse thickness difference measurement unit 10, the regulator 9 changes the calculated bending pressure when the strip is rolled to the side of the mismatch. .

At the time of the exit of the rear end of the strip of rolls from the rolls, the sensor 13 of the presence of metal in the deformation zone sends a signal to the block. 11, which reduces the pressure setting of the fluid pressure regulator 9 to the magnitude of the balancing force of the upper work roll.

When approaching the sensor 12 of the second strip of the rolled batch of strips of this size, the sensor 12 sends a signal to the pressure correction unit 11, which generates a signal proportional to the sum of the calculated value, bending pressure during rolling of the strip and the actual pressure drop when the previous strip is seized by the rolls, i.e. . in this case, the first strip of the batch of lanes, the information about which enters the correction block 11 to its third input from the output of the comparison element 16

The difference between the proposed and the known devices lies in the following.

In the known device, at the approach of both the first and all subsequent strips of a batch of one standard size, the sensor 12 for positioning the strip in front of the cage sends a signal to the pressure correction unit 11, which generates a signal proportional to the sum of the calculated bending pressure of the rolling strip and the calculated dynamic pressure drops of the band's bend bending by the rollers, which are calculated before the start of the batch rolling of the strip of bands by the computing device and entered into the correction unit 11.

In the proposed device, the pressure of the bending in hydraulic cylinders

1 before rolling the first batch of batches is set in the same way as in the known device. However, before rolling the second and all subsequent strips of a batch of one standard size, the pressure in the hydraulic cylinders 1 is set equal to the sum of the calculated value of the anti-bend in the rolling strip and the actual value of the dynamic pressure drop during trapping

strips with rollers, measured when the rollers capture the previous strips with the help of the following elements additionally inserted into the device: a fluid pressure sensor, a memory unit, an element

comparisons and their connections, which allows for the entry of a strip into a cage to obtain such an anti-bend pressure in hydraulic cylinders 1, the value of which does not differ from the anti-bend pressure value required during strip rolling.

The proposed roll bending device can be applied both on the designed and operating mills.

The use of the device on the hot rolling mill 170.0 improves the accuracy of the rolled strips by reducing the transverse thickness variation and the flatness of their front

plots. .

The economic effect is 42,300 rubles.

Claims (1)

Invention Formula Rolls bending device according to auth. St. No. 768513, characterized in that, in order to improve rolling accuracy, a fluid pressure sensor, a memory unit and a ccccib element are additionally introduced, the output of the fluid pressure sensor is connected to the information input of the memory unit, the first and The second control inputs of which are connected to the outputs, respectively, of a strip position sensor in front of the stand and a metal presence sensor in the hearth 50 deformations, and its first and second outputs are connected respectively to the first and second inputs of the reference element, the output of which is connected to the third input of the correction unit 55 pressure. Sources of information taken into account during the examination 1. USSR author's certificate 60 768513, cl. B 21 B 37/08, 1978. From dsgtchika / 3 From item  sixteen FIG. 2