SU1705072A1 - Apparatus for automatic control of strip shape parameter - Google Patents

Abstract

The invention relates to the metallurgical industry and can be used to automate sheet rolling mills, in particular for adjusting the shape of the strip. The purpose of the invention is to stabilize the rolling process, improve the quality of the resulting strip and increase the yield. This goal is achieved by the fact that the device for automatic adjustment of the strip shape contains a unit for calculating the differences between the values of machine sweeps, forces and rolling speeds in the j-th (j 1, ..., p-1) and last (n-th ) Mill cages and a unit for calculating the adjustment settings for hydro-bending and supplying coolant to the j-mill. At the same time, when adjusting the flatness in the first (p-1) cells, the change in the hardness of the metal, which changes as the strip passes along the mill line, and the technological basis and the state of all the cages are taken into account. 3 il. SB with vj about eaten o

Description

The invention relates to the metallurgical industry and may not be used to automate thin-sheet reading mills, in particular for adjusting the shape of the strip.

The purpose of the invention is to stabilize the rolling process, improve the quality of the resulting strip and increase the yield to full.

; Figure 1 shows a diagram of the connections of the proposed device with the remaining elements of the rolling mill systems.

The device for automatically adjusting the shape of the strip contains force meters 1 and rolling speeds 2, the outputs of which are connected to inputs 3.1, 3.2, 3.3, 3.4 of the first arithmetic unit 3, the output of which is connected to input 4.1 of the second arithmetic unit 4, inputs 4.2, 4 .3 of which connected to the outputs of the unit 5 forming the settings of the bending and cooling of the rolls in the last stand. The output of the flatness meter 6 is connected to the input of the unit 5 and the input 4.4 of the second arithmetic unit 4, the output of which is connected to the input of the technological automation unit 7, which controls the hydraulic bend system 8 and the cooling system 9 of the rolls of the jth stand of the mill, and the video device 10.

. Inputs 3.5, 3.6, 3.Л 3.8, 3.9 of the first arithmetic unit 3 and 4.5, 4.6, 1.7, 4.8, 4.9, 4.10. 4.11, -4.12 4.13 of the second arithmetic unit 4 are connected to the interface of the computing means. Technological automation.

Figure 2 shows the block diagram of the first arithmetic unit for calculating the differences between the values of machine profiles, forces and rolling speeds j-rt and the n-th mill stands. Force meters (Pj, RP and rolling speeds (Vj, yn) for the jth and nth stands are presented in the form of sensors 3.1-3.4). The outputs of sensors 3.3-3.4 are connected to the inputs of inverters 12 and 13, the outputs of which are connected to The first inputs of adders 2P and 21, the second inputs of which are connected to the outputs of the sensor 3.1-3.-. The input of the inverter.-) 11 is connected to the interface channel, which gives signals about the values of machine profiles

five

0

five

0

five

0

five

0

five

of the nth stand work rolls (((.,). The output of the inverter 11 is connected to the first input of the adder 14, the second input of which is connected to the interface channel, which gives signals about the values of machine profiles of the jth stand work rolls (P.1 The outputs of the adders 19 and 21 are connected to the first 7-1 and the inputs of the multipliers 14, 15, 16. The second inputs are connected to the interface channels, which give signals about the values of the transmission coefficients from the effects of machine profiling (Cd) ) and speed (Ku) of the j-th rolling stand on the tension unevenness and shape The outputs of the multipliers 15 and 16 are connected to the inputs of inverters 17 and 18, the outputs of which are connected to the first inputs of adders 22 and 23, where the second input of the adder 22 is connected to the output of the multiplier 14, and the second input of the adder 23 is connected to the output of the adder 22. Output the channel of the first arithmetic unit is the output of the adder 23.

FIG. 3 shows a block diagram of the second arithmetic unit for calculating the adjustment settings for water bending and coolant supply for the jth mill stand.

The output of the first arithmetic unit is connected to the input of the inverter 30, the output of which is connected to the first input of the adder 36, the second input of which is connected to the sensor 1 for measuring the nonuniformity of tension across the strip width (o (Hn) installed at the output of the last mill stand). divider 29 is connected to the first input, the second input of which is connected to the interface channel, which gives signals about the value of the transmission coefficient from hydronz-flex (Kp :), the j-roll roller system, non-uniformity of the substrate and the strip shape.The first interface of the divider 26 and the first input of the divider 28 are connected by the same interface channel. The second input of the divider 26 is connected to the output of the adder 35, the first pass of the horn is connected to the interface channel, which gives signals about the value of non-uniformity of tension across the bandwidth in the j-th mill stand (tfGp., j). The second pass of the slider 35 is connected to the inverter 27, the input of which is connected to the interface channel, which is received; signals about the irregularity value

suppurations across the width of the strip in the n-th mill stand (ЈG, qn). The second input of the delimiter 28 is connected with the interface channel, which gives a signal about the value of the transmission coefficient from the effects of cooling () of the roll system of the jth stand on the unevenness of the npt and the shape of the strip. The first entrance is a clever tenant. 25 is connected to the first output of the unit for forming the settings of the hydrobeat (RP1) and cooling (OHP) of the shaft in the n-th stand, which generates a signal. The second input of the multiplier 25 is connected to the output of the divider 2, the inputs of which are connected to the interface channels and which give signals about the values of the transmission coefficients. from the effects of cooling () and water bending (CRP) of the roll system of the nth stand on the unevenness of the tension and the shape of the strip. The outputs of the multiplier 25 and dividers 26, 29 are connected to the first inputs of the adders 37 38, 39. The second input of the adder 37 is connected to the second output of the unit for forming the settings of the bending and cooling rolls in the n-th stand, which gives the signal F, -. The output of the adder 37 is connected to the second input of the adder 39i, the output of which is connected to the first input of the divider 31, the second input of which is connected to the interface channel, which gives a signal about the change in band stiffness beyond the j-th stand (qj). The output of the divider 31 is connected to the first input of the multiplier 32 and to the first input of the multiplier 33, the second input of which is connected to the output of the multiplier 3 whose first input is connected to the output of the divider .8. The second inputs of multipliers 32 and 28 are connected to the interface channels, which will give signals about the values of the weighting coefficients of the settings of the water bend (K,) and roll cooling (Kg) in the j-th stand. The outputs of the multipliers 32 and 33 are the outputs of the second arithmetic unit and are connected to the inputs of the technological automation unit.

The current values of the control channels for stabilizing the rolling process and adjusting the shape of the strip from the output of multipliers 32, 33 are expressed as a percentage of their maximum values, and the distribution of stresses across the width of the strip is described by a parabola.

and for simplicity, are specified by ncrp numbering.

cC1; SSHS

R

 one

where is C1

1, ..., n, (1)

Pj j

- specific tensions at the edge and in the middle of the strip

(In practice, the distribution of tension across the width of the strip is of the most diverse nature and can be specified either in a tabular form or by polynomials of various orders).

The weighting factors K (and K are related by

TO

1 TO

2 i

(2)

KFJ. KUJ- KtV KFn bone strip ugj

KV

and the transfer coefficients KD |, “p, -,

 gestural changes are calculated by a known technique.

The device for automatically adjusting the shape of the strip operates as follows.

The current values of force and speed of rolling, measured in the last (nth) mill stand by sensors 3.2 and 3. (Fig. 2), are fed to the inputs of inverters 12 and 13, respectively, of the first arithmetic unit. The input to the inverter 11 is supplied with a signal corresponding to the specified value of the machine profiling of the work rolls and the last mill stand, which is summed in the adder 19 with a signal corresponding to the specified value of the machine profiling of the working rolls of the controlled (jth) mill stand. The current values of force and speed of rolling, measured in a controlled stand by sensors 3.1 and 3.3, are summed with the output signals of inverters 12 and 13, respectively. The signals from the outputs of the adders 19, 20 and 21 are fed to the first inputs of the multipliers I, 15 and 16, to the second inputs of which signals are given corresponding to the specified values of the coefficients

five

transfer K,

TO,

Kyj at non-uniform 4Dj Pj vj tension in a controlled stand

before machine profiling, force and speed of rolling. . For the cold rolling mill 2030 NLMK, the empirical dependences of the transfer coefficients were obtained:

Kjjj 120hj + 0.000182 B Kpj 0.09- 0.005-15 lij - 0.0000273 H j 1, ..., n (3) Kv- 0.05 - 0.00364.hj - 0.0000182 V

where hj, B is the total value and width of the strip at the exit of the J-th stand, mm. Multiplied signal Kr., And with the output of the adder in the multiplier K y. and from the output of the adder and the multiplier are inverted in the inverters. In the adder, the signals from the multiplier output and the inverter output are added and the resulting signal is fed to the input of the adder, where it is summed with the signal from the Inventor and the resulting signal from the adder output is fed to the inverter input of the second arithmetic unit. The current values of the band irregularity measured by the sensor at the exit of the mill in different parts of the strip width, either at fixed intervals of time or at a fixed number of revolutions of the measuring roller (for example, using a stressometric roller), are fed to the input of the adder, where they are added to the output inverter signal. The resulting signal from the inverter is fed to the input divider, where the response is to the specified signal, corresponding to the transfer coefficient Kpj, to: uneven tension in the control in my stand from the action (. Placium CO) K, and to the divider divided by it the resulting signal from the output of the adder, to the inputs of which a signal is given about the set value of tension non-uniformity across the width of the band ASCh1 in the controlled stand and the signal about the set value of the tension unevenness across the width of the band $ inverted into the inverter .

LL cold rolling mill 2030 NLMK were obtained empirical dependence of the coefficients in front

KQ KF; :

KQ 0.073 hj + 0.00011 iB

, 236hj + 0, OCClЈ2 V

j 1, ..., n. (A)

The signals on the set values of the transfer coefficients nl tension in the n-th stand from the effort of hydraulic pressure-OO CGP, from e

JO

15

20

thirty

- $$ l

/ 050728

The coolant is transferred to the splitter's output, from whose output the signal KQ () / | (: gets to the first input of the multiplier, the second input of which for the last stand of the mill and the cooling rolls for the last stand of the mill is signaled COW nn consumption in the last stand of the mill. The output from the multiplier is fed to the input of the adder, where it is summed up with the output signal of the force of the bending force in the last stand: EG from the forming unit of the settings of the bending and cooling of the rolls. The resulting signal from the output of the adder is summed with the output signal of the divider in the adder, from the output of which the resultant signal is summed in the adder with the output signal of the divider. The resulting signal from the output of the adder is fed to the input of the divider, which is divided by the signal about the change value (or calculated (3)) the stiffness of the strip at the output of the controlled stand. The signal from the output of the divider is given to the input of the multiplier, where it is multiplied with the signal about the specified value of the weight coefficient K. From the output of the multiplier and the output of the divider, signals are sent to the input s multiplier. Simultaneously, from the output of the divider, the signal is fed to the input of the multiplier and multiplied with the signal of the set value of the weight coefficient K. The resulting adjustment signals from the outputs of the multipliers are fed to the input of the technological automation unit, which in turn outputs control signals Frj and $ 0 to the control actuators by the systems hydraulic bending and coolant supply, in the j-th stand. When choosing values

The settings of the individual adjustment channels primarily use a roll cooling system; bending is used to quickly adjust the shape of the strip in the event of an abrupt change in the nature of the distribution of tension across the strip width (change of size, change of rolling mode, etc.) and is minimized stabilization of the thermal profile of rolls. Such an alternative is achieved by using its own coefficients K and Cl, which are related by dependence (1), which can take

40

50

values with a range. C-1, thereby changing the weight of the per perusion channel (iV. and iv () J, respectively) in the overall control system.

The use of the proposed device allows to stabilize the rolling process for preliminary estimates of the edges of the strip and the first cells of the mill, taking into account the change in its rigidity at each stage of reduction, to increase the yield that is acceptable due to the reduced probability

The tracking system for the pumping process, about iiee, so that, in order to stabilize the rolling process, improve the quality of the half-rolled strip and increase the yield, it is equipped with a unit for adjusting the water bending and cooling lubricant for the j-th stand and the unit for calculating the differences between the values of machine profiles, forces and rolling speeds of the j-th and last (p-th) mill stands, the first and second inputs

interconnections due to the)) 5 which are connected to the outputs measuring force and speed of rolling in the j-th stand, the third and fourth inputs are connected to the outputs of measuring force and speed of rolling in the n-th stand, the first input, the unit for calculating the adjusting settings of the hydrobend and supply of coolant for the jth stand of the mill is connected to the output of the unit for calculating the difference between the edges of the mill on its edges, to improve the geometric characteristics of the rolled stock for estimates of rational use of shape control systems

Claims (1)

bands.20 Claims of invention force and speed of rolling in the j-th stand, the third and fourth input are connected to the outputs of the force and speed measuring meters in the p-th stand, the first entrance, the block for calculating the adjustment settings of the hydraulic bend and the supply of coolant for the j-th stand connected to the output of the unit for calculating differences A device for automatic adjustment of the strip shape on a n-type rolling mill, containing a block of 25 DM with machine tools for profiling-process automation, measurements, forces and rolling speeds The jth and last (pth) stands of the mill are the second and third entrances - with the outputs of the block forming the settings of the water bending and cooling of the rolls in the stand after it, the fourth input - with the output of the flatness gauge, and the output with the inputs of the technological automation unit and video device rolling process tracking systems. forces and speeds of rolling, block forming the settings of the water bending and cooling rolls of the last mill stand, the entrance of which is connected to the output of the flatness meter installed behind the last stand, water bending and cooling of the rolling rolls connected to the technological unit of the jth (j 1, ..., p-1) mill stands, videoustjjA A 3-6 45 the tele-force and rolling speed in the j-th stand, the third and fourth inputs are connected to the outputs of the force and speed measuring meters in the p-th stand, the first input, the block for calculating the adjustment settings of the hydraulic bend and the supply of coolant for the j-th stand of the mill with the output of the unit for calculating the differences between the internal doors and the widths of the machine profiles, forces and rolling speeds Remote control of machine profiles, forces and rolling speeds j-th and last (p-th) mill stand, the second and third entrances - with the outputs of the unit for forming the water bending and cooling rolls in the last stand, the fourth input - with the output of the flatness gauge, and the output - with the inputs of the technological automation unit and video system tracking the rolling process. I ha 4.6 474.8 4-9 4. Iff FIG. one 3.6 3.5 1705072