CN104209344B - Hot tandem rolling special steel dynamic self-adapting pressing control method - Google Patents
Hot tandem rolling special steel dynamic self-adapting pressing control method Download PDFInfo
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- CN104209344B CN104209344B CN201410443492.1A CN201410443492A CN104209344B CN 104209344 B CN104209344 B CN 104209344B CN 201410443492 A CN201410443492 A CN 201410443492A CN 104209344 B CN104209344 B CN 104209344B
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Abstract
Hot tandem rolling special steel dynamic self-adapting pressing control method, belongs to metallurgical steel rolling field, namely during steel 0-2 second stung by mm finishing mill unit each frame band steel, carries out Correction and Control to frame screwdown gear; Namely milling train correction pressure Bounce distance △ h is adopted
'= K
* △ h =K
* f (△ P, M, B) controls, and in formula, △ h is conventional rolling mill pressure Bounce distance, and M is mill modulus, and B is strip width, and △ P is that draught pressure is poor, K
for coefficient, △ h= f (△ P, M, B), △ P=ABS(survey draught pressure-setting pressure),
, 0 <
≤ 1.The present invention can make hot-strip effectively solve the significantly action of finish rolling pressure, reduces the remarkable action of kink.By pressure dynamic self-adapting control algolithm, ensure that rolling is stablized, improve product thickness qualification rate, greatly reduce finish rolling Rolling failure and equipment fault.
Description
Technical field
The invention belongs to metallurgical steel rolling field, the pressure being specially hot-continuous-rolling strip steel finishing mill controls automatically.
Background technology
Hot tandem generally has 7 frames, and each frame respectively has holding-down device of hydraulic, and hydraulic pressing is servo-drive system, and response action is fast.Due to the equal factor of the kind material of special steel, temperature, when causing mm finishing mill unit band steel threading draught pressure change greatly with kink abnormal operation, cause finish rolling rolling instability that steel scrap, damage plant equipment even occur.Press control is set up based on frame spring equation, and milling train is after spring variable quantity compensates, and band steel shuts out thickness and changes.Therefore, the principal element of influence zone steel exports thickness is milling train elastic deformation amount.
Summary of the invention
The present invention to deal with problems into:
(1) during solution special steel threading, finish rolling pressure roll-force changes the rolling abnormal problem caused greatly.
(2) problem of finishing stand kink abnormal operation when solving hot tandem rolling special steel threading.
(3) solve the stability contorting of mm finishing mill unit, effectively improve the thickness and precision of band steel.
Technical scheme of the present invention:
Special steel kind of the present invention has nickel and stainless steel, high-strength steel, silicon steel.
Hot tandem rolling special steel dynamic self-adapting pressing control method, namely controls frame screwdown gear during steel 0-2 second stung by mm finishing mill unit each frame band steel; Rolling mill screwdown Bounce distance △ h '=K
a* f (△ P, M, B), M is mill modulus, and B is strip width, and △ P is draught pressure difference (taking absolute value), K
afor coefficient, K
a=a
Δ P ÷ 100(0 < a≤1), △ P=ABS (actual measurement draught pressure-setting pressure), a: steel grade coefficient;
Computer for controlling is according to sending the difference of stinging steel grade under different frame, and steel grade coefficient a value is different, to change control characteristic, because belt steel rolling fluctuation is to the effect of mill spring amount when effectively weakening threading, reduces the impact of pressure on kink between frame and plate shape.Occurrence needs bonding apparatus process debugging to determine.
Steel grade coefficient and actuation time choose table:
The present invention is completed by Siemens's TDC controller, CPU model: CPU550; Control signal passage: SM500; Have employed Rexroth servo valve, servo valve is connected by pipeline with hydraulic cylinder, Driven by Hydraulic Cylinder hydraulic pressing device action.
The present invention can make hot-strip effectively solve the significantly action of finish rolling pressure, reduces the remarkable action of kink.By pressure dynamic self-adapting control algolithm, ensure that rolling is stablized, improve product thickness qualification rate, greatly reduce finish rolling Rolling failure and equipment fault.
After Taiyuan Iron and Steel Co. hot continuous rolling factory finishing mill press down system uses this technical scheme, effect is as follows:
(1) because belt steel rolling fluctuation is to the effect of mill spring amount when effectively weakening threading, ensure that rolling is stablized.
(2) decrease the impact of pressure on kink, ensure that the action of kink is normal, greatly reduce finish rolling Rolling failure and equipment fault.
(3) annual about 5,310,000 yuan of the direct economic benefit obtained.
Accompanying drawing explanation
Fig. 1 is rolling mill screwdown Bounce distance exponential function schematic diagram of the present invention.
Detailed description of the invention
Embodiment 1:
Hot tandem generally has 7 frames, and each frame respectively has holding-down device of hydraulic, and hydraulic pressing is servo-drive system, and response action is fast.Due to factors such as silicon steel kind material, phase transformations, when causing mm finishing mill unit band steel threading, draught pressure change causes greatly kink abnormal operation, causes finish rolling rolling unstable.In order to reduce draught pressure change greatly on the impact of hydraulic pressing action, according to Taiyuan Iron and Steel Co. hot continuous rolling factory actual conditions, application hot tandem rolling special steel dynamic self-adapting pressing control method carries out correction to the rolling mill screwdown Bounce distance △ h that normal equation calculates and becomes △ h ', i.e. rolling mill screwdown Bounce distance △ h '=K
a* △ h=K
a* f (△ P, M, B), M is mill modulus, and B is strip width, and △ P is that draught pressure is poor, K
afor coefficient, K
a=a
Δ P ÷ 100(0 < a≤1), △ P=ABS (actual measurement draught pressure-setting pressure).
For F0 frame rolling silicon steel 29 specification 2.6*1250: setting pressure is 2500 tons, stinging steel actual measurement draught pressure is 3000 tons, draught pressure difference △ P=ABS (3000-2500)=500 ton, conveniently equation rolling mill screwdown Bounce distance calculates △ h=0.78, be 0.8 according to above-mentioned parameter table F0 steel grade coefficient a, obtain △ h ' ≈ 0.257; When draught pressure difference △ P is 300 ton hours, obtain △ h ' ≈ 0.4, show that draught pressure difference is larger, dynamic rolling mill screwdown Bounce distance △ h ' is less, and hydraulic pressing actuating quantity is relatively just little, and rolling is just stable.
Embodiment 2:
Hot tandem generally has 7 frames, and each frame respectively has holding-down device of hydraulic, and hydraulic pressing is servo-drive system, and response action is fast.Due to factors such as silicon steel kind material, phase transformations, when causing mm finishing mill unit band steel threading, draught pressure change causes greatly kink abnormal operation, causes finish rolling rolling unstable.In order to reduce draught pressure change greatly on the impact of hydraulic pressing action, according to Taiyuan Iron and Steel Co. hot continuous rolling factory actual conditions, application hot tandem rolling special steel dynamic self-adapting pressing control method carries out correction to the rolling mill screwdown Bounce distance △ h that normal equation calculates and becomes △ h ', i.e. rolling mill screwdown Bounce distance △ h '=K
a* △ h=K
a* f (△ P, M, B), M is mill modulus, and B is strip width, and △ P is that draught pressure is poor, K
afor coefficient, K
a=a
Δ P ÷ 100(0 < a≤1), △ P=ABS (actual measurement draught pressure-setting pressure).
For F6 frame rolling nickel 3.0*1240 stainless steel: setting pressure is 1500 tons, stinging steel actual measurement draught pressure is 1800 tons, draught pressure difference △ P=ABS (1800-1500)=300 ton, conveniently equation rolling mill screwdown Bounce distance calculates △ h=0.38, be 0.8 according to above-mentioned parameter table F6 steel grade coefficient a, obtain △ h ' ≈ 0.2; When draught pressure difference △ P is 100 ton hours, obtain △ h ' ≈ 0.3, show that draught pressure difference is larger, dynamic rolling mill screwdown Bounce distance △ h ' is less, and hydraulic pressing actuating quantity is relatively just little, and rolling is just stable.
Claims (1)
1. hot tandem rolling special steel dynamic self-adapting pressing control method, namely during steel 0-2 second stung by mm finishing mill unit each frame band steel, carries out Correction and Control to frame screwdown gear; Namely milling train correction pressure Bounce distance △ h '=K is adopted
a* △ h=K
a* f (△ P, M, B) controls, and in formula, △ h is conventional rolling mill pressure Bounce distance, and M is mill modulus, and B is strip width, and △ P is that draught pressure is poor, K
afor coefficient, △ h=f (△ P, M, B) is normal equation, △ P=ABS (actual measurement draught pressure-setting pressure), K
a=a
Δ P ÷ 100, 0 < a≤1; A is steel grade coefficient; Described steel grade coefficient a and band steel are stung the steel time and are respectively:
It is 0.95, F1 frame be 0.95, F2 frame be 0.95, F3 frame be 0.85, F4 frame be 0.85, F5 frame be 0.8, F6 frame is 0.8 that the steel grade coefficient a of high-strength steel is respectively F0 frame; The band steel of high-strength steel is stung the steel time and is 0.5 second;
It is 0.8, F1 frame be 0.8, F2 frame be 0.8, F3 frame be 0.75, F4 frame be 0.75, F5 frame be 0.7, F6 frame is 0.7 that the steel grade coefficient a of silicon steel is respectively F0 frame; The band steel of silicon steel is stung the steel time and is 2 seconds;
It is 0.9, F1 frame be 0.9, F2 frame be 0.9, F3 frame be 0.8, F4 frame be 0.8, F5 frame be 0.8, F6 frame is 0.8 that the steel grade coefficient a of nickel and stainless steel is respectively F0 frame; The steel time stung by the band steel of nickel and stainless steel be F0 ~ F2 frame is 1.5 seconds, and F3 ~ F6 frame is all 1.0 seconds.
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| CN104209344B true CN104209344B (en) | 2016-03-09 |
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| CN105032948A (en) * | 2015-08-25 | 2015-11-11 | 首钢京唐钢铁联合有限责任公司 | Control method for improving rough rolling camber |
| CN106345818B (en) * | 2016-11-09 | 2018-03-13 | 北京金自天正智能控制股份有限公司 | A kind of board-shape control method of steel for special purposes |
| CN109277414B (en) * | 2018-10-25 | 2020-11-03 | 山西太钢不锈钢股份有限公司 | Rolling control method for hot continuous rolling finishing mill group |
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