CN102989787A - Method for controlling head and tail shapes of hot-rolled strip steel - Google Patents

Method for controlling head and tail shapes of hot-rolled strip steel Download PDF

Info

Publication number
CN102989787A
CN102989787A CN2012105604916A CN201210560491A CN102989787A CN 102989787 A CN102989787 A CN 102989787A CN 2012105604916 A CN2012105604916 A CN 2012105604916A CN 201210560491 A CN201210560491 A CN 201210560491A CN 102989787 A CN102989787 A CN 102989787A
Authority
CN
China
Prior art keywords
bending roller
force
roller force
equilibrant
bending
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN2012105604916A
Other languages
Chinese (zh)
Other versions
CN102989787B (en
Inventor
于斌
杨旭
郭宝安
何士国
马荣材
刘金超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Angang Steel Co Ltd
Original Assignee
Angang Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Angang Steel Co Ltd filed Critical Angang Steel Co Ltd
Priority to CN201210560491.6A priority Critical patent/CN102989787B/en
Publication of CN102989787A publication Critical patent/CN102989787A/en
Application granted granted Critical
Publication of CN102989787B publication Critical patent/CN102989787B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

The invention provides a method for controlling the head and tail shapes of hot-rolled strip steel. For the control on the head shape of strip steel, the smooth switching between the balancing and roll bending of a rack is controlled through a steel biting rising edge signal of the rack; and for the control on the tail shape of the strip steel, the smooth switching between the roll bending and balancing of a follow-up rack is controlled through a steel throwing falling edge signal of an upstream rack. According to the invention, through the reasonable design on a hydraulic balancing and roll bending control scheme of a working roll of a rear finishing mill, phenomena such as the head and tail shapes of strip steel are deteriorated due to the instantaneous switching between balancing and roll bending, and the like can be effectively prevented, thereby improving the quality of head and tail shapes of the strip steel, avoiding the occurrence of creasing and strip breakage accidents, and reducing the production cost.

Description

A kind of hot-strip is board-shape control method end to end
Technical field
The invention belongs to the steel rolling field, particularly steadily control the method with steel toe tailgate shape in a kind of hot-rolling finishing mill group.
Background technology
The roller oil cylinder of hot-rolling finishing mill working roll and balancing cylinder are same hydraulic jack, because this hydraulic jack is between upper and lower working roll, stressed in working roll bearing block, therefore, rolling mill hydraulic work roll bending system has the effect of roller and balance simultaneously concurrently.Hydraulic Roll Bending System was in the equilibrant force state when milling train was unloaded, and its Main Function is to support upper roller system weight, realizes setting roll gap, and top working roll and backing roll contacted when assurance was unloaded; Milling train is in the bending roller force state after stinging steel, and its Main Function is to change roll gap shape by roller to improve plate shape.Be in the rolling process, after milling train was stung steel, hydraulic bending roll can switch to the roller state from poised state automatically, and before the throwing steel, hydraulic bending roll then can switch to poised state from the roller state.
The switching controls mode of working roll balance and roller directly affects band steel toe tail strip shape quality.The larger variation of roller is equivalent to the larger variation of roll gap, and when bending roller force and equilibrant force difference were larger, the moment switching often caused the metal flow in the roll gap untimely, causes belt plate shape to worsen, and will occur creasing even belt phenomenon.
Summary of the invention
Purpose of the present invention aims to provide the method for steadily controlling in a kind of hot-rolling finishing mill group with steel toe tailgate shape, when solving that working roll equilibrant force and bending roller force difference are larger in the prior art, balance and roller moment switch and cause the untimely harmful effect that brings of metal flow in the roll gap, thereby avoid being with steel toe tailgate shape to worsen and the phenomenon such as broken belt occurs.
For this reason, the technical solution taked of the present invention is:
A kind of hot-strip is board-shape control method end to end, by this frame sting steel rising edge signal, control the steady switching of this frame balance and roller; By the throwing steel trailing edge signal of upstream frame, control the steady switching of follow-up frame roller and balance; Its concrete control method is:
For the control of band steel head plate shape, the concrete steps that balance and roller are switched are:
A. with four finishing mill F behind the hot continuous rolling unit n-3 , F n-2 , F n-1 , F n Sting steel rising edge signal, correspondence is incorporated into F respectively n-3 , F n-2 , F n-1 , F n In the hydraulic bending roll control interface of frame, as control signal, nBe tandem mill frame sum;
B. according to control signal, according to F n-3 , F n-2 , F n-1 , F n Order, calculate successively and compare | bending roller force setting value-equilibrant force |＞threshold values, if condition is false, time-delay T B3After, equilibrant force is adjusted to the bending roller force setting value.
If condition is set up, time-delay T B1After, equilibrant force is adjusted to bending roller force 1, bending roller force 1Equal equilibrant force ± threshold values, when bending roller force setting value during greater than equilibrant force, be taken as on the occasion of; When bending roller force sets value less than equilibrant force, be taken as negative value; Afterwards, calculate again and compare | bending roller force setting value-bending roller force 1|＞threshold values, if condition is false, time-delay T B3, with bending roller force 1Be adjusted into the bending roller force setting value; If condition is set up, time-delay T B2, with bending roller force 1Be adjusted to bending roller force 2, bending roller force 2Equal bending roller force 1± threshold values is when bending roller force sets value greater than bending roller force 1The time, be taken as on the occasion of; The bending roller force setting value is less than bending roller force 1The time, be taken as negative value; T again delays time B3, with bending roller force 2Be adjusted to the bending roller force setting value.
For the control of band steel afterbody plate shape, the concrete steps that roller and balance are switched are:
A. with hot continuous rolling unit finishing mill F n-4 , F n-3 , F n-2 , F n-1 Load trailing edge signal, the corresponding adjacent F in downstream that is incorporated into respectively n-3 , F n-2 , F n-1 , F n In the hydraulic bending roll control interface of frame, as control signal;
B. according to control signal, successively according to F n-3 , F n-2 , F n-1 , F n Order, calculate and relatively | bending roller force setting value-equilibrant force |＞threshold values, if condition is false, T delays time O3, the bending roller force setting value is adjusted to equilibrant force.
If condition is set up, time-delay T O1, the bending roller force setting value is adjusted to bending roller force 1, bending roller force 1Equal bending roller force setting value ± threshold values, when bending roller force sets value greater than equilibrant force, be taken as negative value; Bending roller force setting value is during less than equilibrant force, be taken as on the occasion of; Afterwards, calculate relatively | bending roller force 1-equilibrant force |＞threshold values, if condition is false, time-delay T O3, with bending roller force 1Be adjusted to equilibrant force; If condition is set up, time-delay T O2, with bending roller force 1Be adjusted to bending roller force 2, bending roller force 2Equal bending roller force 1± threshold values is worked as bending roller force 1Greater than equilibrant force, be taken as negative value, bending roller force 1Less than equilibrant force, be taken as on the occasion of; T again delays time O3After, with bending roller force 2Be adjusted to equilibrant force.
Described band steel head plate shape control delay time T B1, T B2, T B3Be respectively 40-60ms, 40-60ms, 25-35ms.
Described band steel afterbody plate shape control delay time T O1, T O2, T O3Be respectively 40-60ms, 40-60ms, 20-40ms.
Beneficial effect of the present invention is:
The present invention is by the appropriate design to the hydro-cushion of downstream fine operation roll of mill and roller control program, can effectively prevent the phenomenons such as band steel toe tailgate shape deterioration that balance and roller moment switching cause, thereby improve band steel toe tail strip shape quality, avoid occurring pincher, broken belt accident, reduce production costs.
Description of drawings
Fig. 1 SHAPE * MERGEFORMAT be band steel head plate shape control flow chart.
Fig. 2 is band steel afterbody plate shape control flow chart.
The specific embodiment
The present invention mainly be by this frame sting steel rising edge signal, control the steady switching of this frame balance and roller; Be the throwing steel trailing edge signal of last finishing mill by the upstream frame, control roller that follow-up frame is a rear finishing mill and the steady switching of balance, thereby avoid because the hydraulic bending roll adjustment amount is excessive, too fast to the harmful effect with steel toe, tailgate shape.
Because first three frame finishing mill F of continuous hot-rolling mill 1, F 2, F 3Belt steel temperature is high, slab thickness is thicker, and metal fluidity is good, so do not use control method of the present invention.The below is only with the 7th finishing mill F in 1580mm hot continuous rolling seven frames (n=7) 7Be example, the present invention will be further described.Other finishing mills such as F 4, F 5, F 6Calculation and control method and F 7Identical.
Embodiment 1:
Get F 7Equilibrant force is 650KN, stings the front bending roller force of steel and is equal to equilibrant force, and the bending roller force setting value is 1200KN, and threshold values is 250KN.By Fig. 1 SHAPE * MERGEFORMAT band steel head plate shape control flow chart as seen, for the control of band steel head plate shape, balance with the concrete steps of roller switching is:
With F 7Sting steel rising edge signal leading to F 7As control signal, work as F in the hydraulic bending roll control interface of frame 7Frame hydraulic bending roll control signal receives F 7After frame is stung steel rising edge signal, at first calculating and more satisfied | bending roller force setting value-equilibrant force | the condition of＞threshold values, namely | and bending roller force sets value 1200 KN-equilibrant force 650 KN |＞threshold values 250 KN, and condition is set up, time-delay 50ms is adjusted to bending roller force with equilibrant force 1, bending roller force 1Equal equilibrant force ± threshold values, be about to equilibrant force 650 KN and adjust to bending roller force 1650 KN+250 KN=900KN.Afterwards, calculate again and compare | bending roller force setting value-bending roller force 1|＞threshold values, namely | bending roller force sets value 1200 KN-bending roller force 1900 KN |=bending roller force 2300 KN＞threshold values 250 KN, condition is set up, and the 50ms that delays time again is with bending roller force 2Adjust to 1150KN, the time-delay 30ms, again with bending roller force by bending roller force 21150KN adjust to 1200KN.
Embodiment 2:
Get F 7The frame equilibrant force is 650KN, and the bending roller force setting value is 800KN, and threshold values is 250KN.For the control of band steel head plate shape, the concrete steps that balance and roller are switched are:
With F 7Sting steel rising edge signal leading to F 7As control signal, work as F in the hydraulic bending roll control interface of frame 7Frame hydraulic bending roll control signal receives F 7After frame is stung steel rising edge signal, at first calculating and more satisfied | bending roller force setting value-equilibrant force | the condition of＞threshold values, namely | bending roller force sets value 800 KN-equilibrant force 650 KN |＜threshold values 250 KN, namely do not satisfy | bending roller force setting value-equilibrant force | the condition of＞threshold values, behind the time-delay 26ms, equilibrant force 650KN is adjusted to bending roller force setting value 800KN.
Embodiment 3:
Get F 7The frame equilibrant force is 650KN, and the bending roller force setting value is 1000KN, and threshold values is 250KN.By Fig. 2 SHAPE * MERGEFORMAT band steel afterbody plate shape control flow chart as seen, for the control of band steel afterbody plate shape, balance with the concrete steps of roller switching is:
Work as F 7Frame hydraulic bending roll control signal receives F 6After frame is thrown steel trailing edge signal, calculating and more satisfied | bending roller force setting value-equilibrant force | the condition of＞threshold values, namely | and bending roller force sets value 1000 KN-equilibrant force 650 KN |＞threshold values 250 KN, and condition is set up, 45 ms that delay time are adjusted to bending roller force with the bending roller force setting value 1, bending roller force 1Equal bending roller force setting value ± threshold values, because the bending roller force setting value is taken as negative value greater than equilibrant force, therefore adjust bending roller force 1=bending roller force sets value 1000 KN-threshold values 250 KN=750 KN; Afterwards, more whether calculating is satisfied | bending roller force 1-equilibrant force | the condition of＞threshold values, namely | bending roller force 1750 KN-equilibrant force 650 KN |=100 KN＜threshold values 250 KN, condition is false, and 30 ms that delay time are with bending roller force 1Be adjusted to equilibrant force 650 KN by 750 KN.
Embodiment 4:
Get F 7The frame equilibrant force is 650KN, and the bending roller force setting value is 800KN, and threshold values is 250KN.By Fig. 2 SHAPE * MERGEFORMAT band steel afterbody plate shape control flow chart as seen, for the control of band steel afterbody plate shape, balance with the concrete steps of roller switching is:
Work as F 7Frame hydraulic bending roll control signal receives F 6After frame is thrown steel trailing edge signal, calculating and more satisfied | bending roller force setting value-equilibrant force | the condition of＞threshold values, namely | bending roller force sets value 800 KN-equilibrant force 650 KN |＜threshold values 250 KN, condition is false, so the 40ms that delays time, the bending roller force setting value is adjusted to equilibrant force 650KN from 800KN.

Claims (3)

1. hot-strip board-shape control method end to end is characterized in that, by this frame sting steel rising edge signal, control the steady switching of this frame balance and roller; By the throwing steel trailing edge signal of upstream frame, control the steady switching of follow-up frame roller and balance; Its concrete control method is:
For the control of band steel head plate shape, the concrete steps that balance and roller are switched are:
A. with four finishing mill F behind the hot continuous rolling unit n-3 , F n-2 , F n-1 , F n Sting steel rising edge signal, correspondence is incorporated into F respectively n-3 , F n-2 , F n-1 , F n In the hydraulic bending roll control interface of frame, as control signal, nBe tandem mill frame sum;
B. according to control signal, according to F n-3 , F n-2 , F n-1 , F n Order, calculate successively and compare | bending roller force setting value-equilibrant force |＞threshold values, if condition is false, time-delay T B3After, equilibrant force is adjusted to the bending roller force setting value;
If condition is set up, time-delay T B1After, equilibrant force is adjusted to bending roller force 1, bending roller force 1Equal equilibrant force ± threshold values, when bending roller force setting value during greater than equilibrant force, be taken as on the occasion of; When bending roller force sets value less than equilibrant force, be taken as negative value; Afterwards, calculate again and compare | bending roller force setting value-bending roller force 1|＞threshold values, if condition is false, time-delay T B3, with bending roller force 1Be adjusted into the bending roller force setting value; If condition is set up, time-delay T B2, with bending roller force 1Be adjusted to bending roller force 2, bending roller force 2Equal bending roller force 1± threshold values is when bending roller force sets value greater than bending roller force 1The time, be taken as on the occasion of; The bending roller force setting value is less than bending roller force 1The time, be taken as negative value; T again delays time B3, with bending roller force 2Be adjusted to the bending roller force setting value;
For the control of band steel afterbody plate shape, the concrete steps that roller and balance are switched are:
A. with hot continuous rolling unit finishing mill F n-4 , F n-3 , F n-2 , F n-1 Load trailing edge signal, the corresponding adjacent F in downstream that is incorporated into respectively n-3 , F n-2 , F n-1 , F n In the hydraulic bending roll control interface of frame, as control signal;
B. according to control signal, successively according to F n-3 , F n-2 , F n-1 , F n Order, calculate and relatively | bending roller force setting value-equilibrant force |＞threshold values, if condition is false, T delays time O3, the bending roller force setting value is adjusted to equilibrant force;
If condition is set up, time-delay T O1, the bending roller force setting value is adjusted to bending roller force 1, bending roller force 1Equal bending roller force setting value ± threshold values, when bending roller force sets value greater than equilibrant force, be taken as negative value; Bending roller force setting value is during less than equilibrant force, be taken as on the occasion of; Afterwards, calculate relatively | bending roller force 1-equilibrant force |＞threshold values, if condition is false, time-delay T O3, with bending roller force 1Be adjusted to equilibrant force; If condition is set up, time-delay T O2, with bending roller force 1Be adjusted to bending roller force 2, bending roller force 2Equal bending roller force 1± threshold values is worked as bending roller force 1Greater than equilibrant force, be taken as negative value, bending roller force 1Less than equilibrant force, be taken as on the occasion of; T again delays time O3After, with bending roller force 2Be adjusted to equilibrant force.
2. hot-strip according to claim 1 board-shape control method end to end is characterized in that, described band steel head plate shape control delay time T B1, T B2, T B3Be respectively 40-60ms, 40-60ms, 25-35ms.
3. hot-strip according to claim 1 board-shape control method end to end is characterized in that, described band steel afterbody plate shape control delay time T O1, T O2, T O3Be respectively 40-60ms, 40-60ms, 20-40ms.
CN201210560491.6A 2012-12-21 2012-12-21 Method for controlling head and tail shapes of hot-rolled strip steel Active CN102989787B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201210560491.6A CN102989787B (en) 2012-12-21 2012-12-21 Method for controlling head and tail shapes of hot-rolled strip steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201210560491.6A CN102989787B (en) 2012-12-21 2012-12-21 Method for controlling head and tail shapes of hot-rolled strip steel

Publications (2)

Publication Number Publication Date
CN102989787A true CN102989787A (en) 2013-03-27
CN102989787B CN102989787B (en) 2014-09-03

Family

ID=47919192

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201210560491.6A Active CN102989787B (en) 2012-12-21 2012-12-21 Method for controlling head and tail shapes of hot-rolled strip steel

Country Status (1)

Country Link
CN (1) CN102989787B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103624088A (en) * 2013-11-29 2014-03-12 内蒙古包钢钢联股份有限公司 Method for eliminating transverse cracks on steel plate tail
CN104772344A (en) * 2014-01-10 2015-07-15 宝山钢铁股份有限公司 Hot rolling synchronization type sizing press tracking method
CN103639206B (en) * 2013-12-23 2016-04-20 内蒙古包钢钢联股份有限公司 A kind of method reducing the pinch roll afterbody clamping time in high-speed wire rolling
CN105598181A (en) * 2016-01-15 2016-05-25 山西太钢不锈钢股份有限公司 Control method for tail of hot continuous rolling thin gauge finish rolling strip steel to automatically reduce roller bending force
CN106623441A (en) * 2016-12-13 2017-05-10 山东钢铁股份有限公司 Method for controlling finish rolling roll bending force on tail of hot-rolled strip
CN109079378A (en) * 2018-10-09 2018-12-25 北京首钢冷轧薄板有限公司 A kind of control system for preventing tail part of band steel from getting rid of welding machine outlet
CN109604350A (en) * 2018-12-21 2019-04-12 攀钢集团西昌钢钒有限公司 A method of improving hot-strip Quality of Tail
CN109807184A (en) * 2017-11-22 2019-05-28 东芝三菱电机产业系统株式会社 The shape control apparatus of cluster mill
CN113198850A (en) * 2021-03-30 2021-08-03 北京首钢股份有限公司 Control method and control system of hot rolling finishing mill group and industrial control equipment

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55139105A (en) * 1979-04-18 1980-10-30 Nippon Steel Corp Controlling method for end shape of steel shape
JPS5770016A (en) * 1980-10-18 1982-04-30 Kobe Steel Ltd Method for controlling thickness of plate at threading
JPS594910A (en) * 1982-07-01 1984-01-11 Kawasaki Steel Corp Restricting method of crop at front and rear ends of sheet bar
CN1053199A (en) * 1989-11-29 1991-07-24 Aeg西屋工业自动化公司 A kind of rolling method with rolled piece of qualified head and afterbody
CN101623708A (en) * 2009-08-05 2010-01-13 燕山大学 Plate-shape control integrated system and executing method thereof
CN201586664U (en) * 2009-12-31 2010-09-22 秦皇岛首秦金属材料有限公司 Roller-bending control on-line switching device of rolling mill

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55139105A (en) * 1979-04-18 1980-10-30 Nippon Steel Corp Controlling method for end shape of steel shape
JPS5770016A (en) * 1980-10-18 1982-04-30 Kobe Steel Ltd Method for controlling thickness of plate at threading
JPS594910A (en) * 1982-07-01 1984-01-11 Kawasaki Steel Corp Restricting method of crop at front and rear ends of sheet bar
CN1053199A (en) * 1989-11-29 1991-07-24 Aeg西屋工业自动化公司 A kind of rolling method with rolled piece of qualified head and afterbody
CN101623708A (en) * 2009-08-05 2010-01-13 燕山大学 Plate-shape control integrated system and executing method thereof
CN201586664U (en) * 2009-12-31 2010-09-22 秦皇岛首秦金属材料有限公司 Roller-bending control on-line switching device of rolling mill

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103624088A (en) * 2013-11-29 2014-03-12 内蒙古包钢钢联股份有限公司 Method for eliminating transverse cracks on steel plate tail
CN103624088B (en) * 2013-11-29 2015-11-18 内蒙古包钢钢联股份有限公司 Eliminate the method for steel plate tail transverse crack
CN103639206B (en) * 2013-12-23 2016-04-20 内蒙古包钢钢联股份有限公司 A kind of method reducing the pinch roll afterbody clamping time in high-speed wire rolling
CN104772344A (en) * 2014-01-10 2015-07-15 宝山钢铁股份有限公司 Hot rolling synchronization type sizing press tracking method
CN105598181A (en) * 2016-01-15 2016-05-25 山西太钢不锈钢股份有限公司 Control method for tail of hot continuous rolling thin gauge finish rolling strip steel to automatically reduce roller bending force
CN106623441A (en) * 2016-12-13 2017-05-10 山东钢铁股份有限公司 Method for controlling finish rolling roll bending force on tail of hot-rolled strip
CN109807184A (en) * 2017-11-22 2019-05-28 东芝三菱电机产业系统株式会社 The shape control apparatus of cluster mill
CN109079378A (en) * 2018-10-09 2018-12-25 北京首钢冷轧薄板有限公司 A kind of control system for preventing tail part of band steel from getting rid of welding machine outlet
CN109079378B (en) * 2018-10-09 2020-10-23 北京首钢冷轧薄板有限公司 Control system for preventing strip steel tail from throwing over welding machine outlet
CN109604350A (en) * 2018-12-21 2019-04-12 攀钢集团西昌钢钒有限公司 A method of improving hot-strip Quality of Tail
CN109604350B (en) * 2018-12-21 2020-11-17 攀钢集团西昌钢钒有限公司 Method for improving tail quality of hot-rolled strip steel
CN113198850A (en) * 2021-03-30 2021-08-03 北京首钢股份有限公司 Control method and control system of hot rolling finishing mill group and industrial control equipment

Also Published As

Publication number Publication date
CN102989787B (en) 2014-09-03

Similar Documents

Publication Publication Date Title
CN102989787B (en) Method for controlling head and tail shapes of hot-rolled strip steel
CN100411760C (en) Dynamic thickening rolling process of controlling break of cold rolled thin strip steel
CN109570241B (en) Wedge-shaped control method with deviation protection
KR101516910B1 (en) Pre-control method of head and tail shapes of continuous casting slab for reducing the removed amount from the head and tail of hot-rolled intermediate slab
CN104209343B (en) Hot-rolling finishing mill frame compensates the control method of prompt drop
CN102825065B (en) Rolling method for steel plates of wide and thin specifications
CN102527735A (en) Method for controlling even deformation of edge portion in medium-thick board rolling
CN104772339A (en) Method for improving rolling stability in steel plate edge drop control process
CN108906893A (en) A kind of milling method improving aluminothermy finish rolling threading success rate
CN205413921U (en) Novel two slab band cold rolling mills of high accuracy
CN106311762B (en) Improve the load distribution method of hot rolled thin strip rolling stability
CN105057364A (en) Magnesium alloy sheet rolling edge crack pre-judgment and control method
CN103801565A (en) Gauge control technique for top and tail of hot rolled strip steel of Steckel mill
CN102974624A (en) Edge plane shape control method of large-expansion-ratio high strength grade pipeline steel
CN103722009A (en) Bar continuous rolling production line
CN209334440U (en) A kind of thin slab continuous casting and rolling unit
CN108838213B (en) Roughing vertical roll idle-passing method
CN103042043A (en) Method for controlling strip steel head and tail widths through coil box production process
CN101920265A (en) Method for optimizing roll shifting process of middle roll of six-roll cold mill
CN110142298B (en) Production method for reducing narrow gauge at head of non-oriented silicon steel
CN101979167A (en) Method for positioning roll seam of roughly rolling vertical miller
CN202377260U (en) Aluminum plate belt hot continuous rolling machine set
CN104084428A (en) Method for online controlling uneven thickening of seamless steel pipe wall in reducing sizing production
CN103624088A (en) Method for eliminating transverse cracks on steel plate tail
CN102581034B (en) Method for controlling multi-frame back finish-rolling unit

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant