CN103223423B - Control method for walking-stopping type high-side-pressure sizing press - Google Patents
Control method for walking-stopping type high-side-pressure sizing press Download PDFInfo
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Abstract
The invention relates to a control method for a walking-stopping type high-side-pressure sizing press. The control method is applied to a control system of a Shougang Jingtang 1580 hot rolling sizing press. The control method comprises the following steps: controlling the speed of a slab subjected to horizontal centering when the plate blank passes through an extrusion chamber of the sizing press to be oblique triangle waveform; switching position control and pressure control of an inlet guide roller and an outlet guide roller of the sizing press by a control window; sending out a starting signal of each roller way when a main motor of the sizing press departs from a stretching angle only with 2-degree superposition; tracking the heat part and the tail part of the slab respectively; when realizing pressure control by utilizing a proportion-integration-differentiation (PID) controller of an integer parameter of a PAC controller of the GE Company, dividing a control factor (actually adopting the integer 10) from the output value of the controller and setting the PID parameter, so that the control precision of the controller is improved. By the control method, the rolling rhythm and the control precision are improved. A good effect is achieved when the control method is applied to control of the Shougang Jingtang 1580 hot rolling sizing press.
Description
Technical field
The invention belongs to the control technology field of large lateral pressure constant width machine in hot continuous rolling production process, be specifically related to a kind of control method walking to stop formula large lateral pressure constant width machine.
Background technology
Slab sizing press (Slab Sizing Press, English abbreviation SSP, Chinese is called for short constant width machine) as the wide equipment of tune of hot rolling large lateral pressure, under as-forged, large width of plate slab rolling is carried out to slab total length, by a time side pressure, Breadth Maximum drafts can reach 350mm; And vertical miller is rolled slab under the state of rolling, through the rolling of 1 ~ 5 passage, lateral pressure amount is maximum is no more than 100mm.Can only side pressure by a small margin and realize width and automatically control (AWC) as attached edger before horizontal mill, adopt the higher constant width machine of efficiency to realize depressing without level width.
Because constant width machine is rolled under as-forged slab, deformation state and the vertical miller of its metal are completely different, therefore before and after the blank that shuts out of constant width machine, cutting head cutting tail loss is little, namely reduces to 0.2% ~ 0.3% by 0.6% ~ 0.7% of the past, substantially increases the recovery rate (reference paper 1: Han Chunying of steel by reducing fish tail, Zhao Wei, Su Zhaofa, Lei Zhiying, the performance characteristics of fixed-width pressure machine " in the hot continuous rolling process ", Anshan iron and steel plant technology, 2000.7).In addition, because the width adjusting amount of constant width machine is wide greatly, this not only adds slab caster on average to cast width, and be increased to 200mm by 50mm for the casting width of slab caster, decrease the kind of continuous casting steel billet width specifications, substantially increase production capacity and the effect of slab caster, absolute effect is served to the stable operation of slab caster simultaneously.
Shoudu Iron and Steel Co capital Tang 1580 Hot Line includes roughing mill R1, R2, and with the vertical miller E1 that roughing mill is supporting, E2, heating furnace, constant width machine (SSP), De-scaling box (HSB) etc. after stove, Fig. 1 is the part layout drawing of Shoudu Iron and Steel Co capital Tang 1580 Hot Line.D1 and D2 is the inlet/outlet roller-way of constant width machine SSP, and D3, D4, D5, G1, G2 and G3 are the inlet/outlet roller-way of roughing mill R1.
As shown in Figure 1, constant width machine is between De-scaling box and roughing mill R1.The slab after de-scaling that heating furnace is sent, is transported to constant width machine front-side guide plate by constant width machine inlet roller way; Then horizontal centring is completed by constant width machine front-side guide plate; Transmit slab by constant width machine inlet roller way motor, entrance and exit pinch roll and entrance and exit deflector roll again to enter and by extrusion chamber, the slab finally having extruded fixed width transmits to downstream via roller-way after constant width machine.At slab in the process of extrusion chamber, the side pressure of large lateral pressure constant width machine to slab be by the tup module of two symmetric motions to the continuous side pressure of slab, realize the wide and slab profile regulation end to end of the tune of slab.The contact surface of tup module and slab is plane, and this is just equivalent to roller footpath is that infinitely-great edger roll carries out side pressure to slab.
The fixed width mode of constant width machine refers to that the inlet roller way of constant width machine and outlet roller-way and entrance pinch roll and outlet pinch roll pinch the extrusion chamber of slab by constant width machine with the motion mode of stepping, and the tup that slab drives through mair motor in extrusion chamber extrudes.In squeeze mode, according to entrance pinch roll and outlet pinch roll stop time, pressure motor stroke whether change and be divided into short stroke pattern and etc. wide mode.Short stroke pattern refers to that slab head is progressively reduced by the stroke depressing motor during tup, and when slab afterbody passes through tup, the stroke of side pressure motor progressively increases; Refer to that slab remains constant by the stroke depressing motor during tup Deng wide mode.
When constant width machine is operated in squeeze mode, slab is fixed width speed by the speed of extrusion chamber, and the waveform of fixed width speed is the isoceles triangle waveform in cycle, and rolling rhythm is certain, can not increase.The inlet roller way of constant width machine, entrance pinch roll, constant width machine export pinch roll and constant width machine outlet roller-way, according to the setting of single step step pitch parameter, according to the code-disc on constant width machine entrance bottom pinch roll or outlet bottom pinch roll power transmission shaft to the accurate tracking of blank, rotarily drive eccentric wheel at constant width machine mair motor and rotate and be in (between 20 ° and 240 °) in idle angular range and complete the accurate conveying of step pitch band steel and the side pressure of presetting position.
Summary of the invention
The present invention is directed to precision controlling and the rolling rhythm control problem of existing constant width machine, propose a kind of control method walking to stop formula large lateral pressure constant width machine.
Walk to stop a control method for formula large lateral pressure constant width machine, be applied in Shoudu Iron and Steel Co capital Tang 1580 hot rolling constant width machine control system, comprise the steps:
Step 1, the slab having controlled horizontal centring is oblique triangle waveform by speed during constant width machine extrusion chamber; Specifically, control the inlet roller way of constant width machine, entrance pinch roll, outlet pinch roll and outlet roller-way, in boosting velocity procedure, adopt the limit acceleration raising speed of transmission device to the fixed width target velocity of setting, when slowing down, decelerate to 0 speed according to the requirement of Stepping positioning with the slope calculated, realize slab sizing when 0 speed;
Step 2, by controlling position control and the Stress control of windows exchange constant width machine entrance deflector roll and outlet deflector roll; Specifically, follow the tracks of for position and control window is provided, utilize the control window of slab head tracking, examine to obtain signal and the time delay of inspection inactivating signal by entrance pinch roll pressure, switch position control and the Stress control of constant width machine entrance deflector roll, afterwards, utilize the control window that slab afterbody is followed the tracks of, by outlet Withdrawal roll pressure examine with the time delay of inspection inactivating signal, switch the outlet position control of deflector roll and Stress control, make to switch more reliable into the position of, outlet deflector roll and Stress control;
Step 3, the mair motor of constant width machine differ from 2 degree leave stretching angle time, send the enabling signal of each roller-way;
Step 4, follows the tracks of respectively to the head of slab and afterbody, and the fixed width of carrying out short stroke pattern controls;
Step 5, utilizing the PID(proportional-integral-differential of the argument of type integer in GE company PAC controller) controller is when realizing Stress control, adopt first to the output valve of controller divided by controlling elements, and then PID, improves the control accuracy of controller.Controlling elements actual employing integer 10.
The control method walking to stop formula large lateral pressure constant width machine provided by the invention, by being oblique triangle Waveform Control by fixed width speed improvement, improves rolling rhythm; Follow the tracks of respectively the head of slab and afterbody, have good control accuracy, the fixed width achieving the exact position of short stroke end to end controls; Before the integer PID controller of adjusting in PAC controller, first to controller output valve divided by controlling elements, then PID, improves control accuracy.The inventive method is applied in the control of Shoudu Iron and Steel Co capital Tang 1580 hot rolling constant width machine can obtain good effect.
Accompanying drawing explanation
Fig. 1 is the part layout drawing of Shoudu Iron and Steel Co capital Tang 1580 Hot Line;
Fig. 2 is the flow chart walking to stop the control method of formula large lateral pressure constant width machine of the present invention;
Fig. 3 is the schematic diagram of the mair motor rotary motion of constant width machine in control method of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Shoudu Iron and Steel Co capital Tang 1580 hot rolling constant width machine control system adopts GE company PAC controller RX7i CPE040 CPU, and main cabinet frame work analog quantity functional module adopts the MEN company third party template based on VME bus, and digital quantity template adopts GE company PAC RX7i's; Long-range cabinet adopts GE company VersaMax I/O station system.The process function that Shoudu Iron and Steel Co capital Tang 1580 hot rolling constant width machine control system mainly completes have the de-scaling of water under high pressure blank, slab conveying and pinch, slab centering, the pressure balance of slab sizing device, tup change and fresh water (FW) cooling etc.
Hardware component involved by constant width machine control system, according to the arrangement of rolling line upstream and downstream order, includes: inlet roller way, entrance deflector roll, entrance pinch roll, extrusion chamber, outlet roller-way, outlet deflector roll and outlet pinch roll.
The slab after de-scaling that heating furnace is sent by the inlet roller way of constant width machine, is transported to constant width machine front-side guide plate; The entrance deflector roll of constant width machine and outlet deflector roll, and entrance pinch roll and outlet pinch roll coordinate and are used for accurately transmitting slab and enter and by the extrusion chamber of constant width machine, in the extrusion chamber of constant width machine, realize the extruding fixed width piecemeal to slab by tup.The slab having extruded fixed width transmits to downstream by the outlet roller-way of constant width machine.
A kind of control method walking to stop formula large lateral pressure constant width machine provided by the invention, improve existing control method, as shown in Figure 2, concrete steps are as follows:
Step 1: the slab having controlled horizontal centring is oblique triangle waveform by speed during constant width machine extrusion chamber.Be that isosceles triangle waveform controls by fixed width speed in existing control method, be improved to oblique triangle Waveform Control.
The implementation that existing isosceles triangle waveform controls fixed width speed is: arranging the inlet roller way of constant width machine, entrance pinch roll, outlet pinch roll and the outlet roller-way acceleration when raising speed identical with the control mode of the acceleration when slowing down, all adopting the acceleration of change according to slab stepping-in amount.
The mode that the present invention adopts oblique triangular waveform to control fixed width speed is: control the inlet roller way of constant width machine, entrance pinch roll, outlet pinch roll and outlet roller-way, in boosting velocity procedure, adopt the limit acceleration of transmission device that the fixed width target velocity of raising speed to setting is set, optimum acceleration time the limit acceleration of transmission device is exactly raising speed, acceleration when arranging raising speed in the embodiment of the present invention is 2.2m/s
2.When slowing down, control the inlet roller way of constant width machine, entrance pinch roll, outlet pinch roll and outlet roller-way, adopt the acceleration of change according to slab stepping-in amount, decelerate to 0 speed according to the requirement of Stepping positioning with the slope calculated, thus realize slab sizing when 0 speed.The inventive method adopts oblique triangular waveform to control fixed width speed, can improve rolling rhythm.
Step 2: by controlling position control and the Stress control of windows exchange constant width machine entrance deflector roll and outlet deflector roll.
In existing control method, the entrance deflector roll of constant width machine and the position control of outlet deflector roll and pressure controlled switching, the exact position of single dependence slab is followed the tracks of and is realized.
Follow the tracks of for position in the inventive method and control window is provided, utilizing the control window of slab head tracking, utilize entrance pinch roll pressure to examine signal and inspection inactivating signal time delay, realize the position control of constant width machine entrance deflector roll and pressure controlled switching, at the control window that slab afterbody is followed the tracks of, utilize outlet Withdrawal roll pressure to examine with the time delay of inspection inactivating signal, realize the outlet position control of deflector roll and pressure controlled switching.Described control window refers to that slab head or afterbody trace in certain coordinates regional of rolling line.This step, by controlling position control and the Stress control of windows exchange constant width machine entrance deflector roll and outlet deflector roll, makes control accuracy more accurate.
Step 3: the control of the mair motor of constant width machine, according to the response characteristic of the inlet roller way of constant width machine, entrance pinch roll, outlet roller-way and outlet pinch roll transmission device, constant width machine mair motor differ from 2 degree leave stretching angle time, just send the enabling signal of each roller-way (comprising inlet roller way, entrance pinch roll, outlet roller-way and outlet pinch roll etc.) in advance, thus utilize the stepping ability of transmission device fully.
As shown in Figure 3, the schematic diagram that the mair motor eccentric shaft for constant width machine moves, 0 ° ~ 20 ° is stretching angular region, and 20 ° ~ 240 ° is idle angular region, is moved forward once by position control at this scope slab.240 ° ~ 248.6 ° is safety angle scope, in this wide device safety, can cushion.248.6 ° ~ 360 ° is extruding angular region, and in this scope, tup impact slab completes fixed width.
Step 4: follow the tracks of respectively the head of slab and afterbody, the fixed width of carrying out the exact position of short stroke end to end controls.
Due to the impact that slab sizing stretches naturally, adopt the slab tracking method of logical plate in existing control method, have impact on slab head tracking, the precision of particularly afterbody tracking.
The present invention adopts the control method of following the tracks of respectively end to end, reduces because slab sizing stretches impact on slab tracking naturally, thus improves head tracking, particularly the afterbody precision of following the tracks of, and the fixed width achieving the exact position of short stroke end to end controls.
Step 5: by the output valve of the PID controller in PAC controller divided by controlling elements, and then PID.
Output due to the proportional gain parameter of the PID controller in the PAC controller of GE company, storage gain parameter, differential gain parameter, the time of integration and derivative time and PID controller is the integer data of 16, if the PID controller utilizing GE PAC controller to carry carries out real process closed-loop control, exporting in control accuracy and will there is larger deviation.
The output valve of the PID controller in PAC controller divided by controlling elements 10, is improved control accuracy by the present invention.For the PID controller parameter data type in the PAC controller of GE company, increase the significant digits of parameter, improve control accuracy, accurate PID controls to apply in Stress control.
Control method of the present invention tested at Shoudu Iron and Steel Co capital Tang 1580 hot rolling constant width machine, result proves, the inventive method improves rolling rhythm, has good control accuracy, obtains good actual effect.
Claims (1)
1. walk to stop a control method for formula large lateral pressure constant width machine, be applied in Shoudu Iron and Steel Co capital Tang 1580 hot rolling constant width machine control system, it is characterized in that, comprise the steps:
Step 1, the slab having controlled horizontal centring is oblique triangle waveform by speed during constant width machine extrusion chamber; Specifically, control the inlet roller way of constant width machine, entrance pinch roll, outlet pinch roll and outlet roller-way, in boosting velocity procedure, adopt the limit acceleration raising speed of transmission device to the fixed width target velocity of setting, when slowing down, adopt the acceleration of change, decelerate to 0 speed according to the requirement of Stepping positioning with the slope calculated, realize slab sizing when 0 speed;
Step 2, by controlling position control and the Stress control of windows exchange constant width machine entrance deflector roll and outlet deflector roll; Specifically, follow the tracks of for position and control window is provided, utilize the control window of slab head tracking, signal and the time delay examining inactivating signal is examined to obtain by entrance pinch roll pressure, switch position control and the Stress control of constant width machine entrance deflector roll, afterwards, utilize the control window that slab afterbody is followed the tracks of, by outlet Withdrawal roll pressure examine with the time delay of inspection inactivating signal, switch the outlet position control of deflector roll and Stress control; Described control window refers to that slab head or afterbody trace in certain coordinates regional of rolling line;
Step 3, the mair motor of constant width machine differ from 2 degree leave stretching angle time, send the enabling signal of each roller-way;
Step 4, follows the tracks of respectively to the head of slab and afterbody, and the fixed width of carrying out short stroke pattern controls;
Step 5, when utilizing PID (proportional-integral-differential) controller of the argument of type integer in GE company PAC controller to realize Stress control, adopt first to the output valve of controller divided by controlling elements, and then PID, controlling elements adopt integer 10.
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| CN201310136387.9A CN103223423B (en) | 2013-04-18 | 2013-04-18 | Control method for walking-stopping type high-side-pressure sizing press |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103722015A (en) * | 2013-12-31 | 2014-04-16 | 一重集团大连设计研究院有限公司 | On-line width adjusting device of hot rolled strip steel production line |
| CN104772344B (en) * | 2014-01-10 | 2016-10-05 | 宝山钢铁股份有限公司 | Hot rolling synchronous mode heavy side press tracking |
| CN105983583B (en) * | 2016-06-28 | 2017-11-28 | 首钢京唐钢铁联合有限责任公司 | A kind of throwing steel method of constant width machine outlet pinch roll |
| CN110508626B (en) * | 2019-07-23 | 2021-07-27 | 北京首钢股份有限公司 | Side press plate blank extrusion control method |
| CN114669599A (en) * | 2022-02-28 | 2022-06-28 | 首钢京唐钢铁联合有限责任公司 | Method for prolonging on-machine time of hammerhead of hot-rolling width-fixing press |
| CN114558897B (en) * | 2022-02-28 | 2024-03-19 | 首钢京唐钢铁联合有限责任公司 | Rhythm control method of width-fixing machine |
| CN114618891B (en) * | 2022-04-06 | 2023-08-18 | 山东钢铁集团日照有限公司 | Control method for solving problem of area blockage of slab width-fixing machine |
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