CN103801565A - Gauge control technique for top and tail of hot rolled strip steel of Steckel mill - Google Patents
Gauge control technique for top and tail of hot rolled strip steel of Steckel mill Download PDFInfo
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- CN103801565A CN103801565A CN201310617208.3A CN201310617208A CN103801565A CN 103801565 A CN103801565 A CN 103801565A CN 201310617208 A CN201310617208 A CN 201310617208A CN 103801565 A CN103801565 A CN 103801565A
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Abstract
The invention discloses a gauge control technique for top and tail of strip steel, and overpressure protection rolls which is located in a high pressure area of top and tail and is protected from being damaged. The gauge control technique comprises steps as follows: during a strip steel rolling process, the end of the strip steel firstly entering the mill is the top, the end later entering the mill is the tail, a high pressure area is set at the top and tail of the strip steel during calendaring, the length of the high pressure area is 0-30 m, and the actual roll gap is S-(S minus 2.5) mm; high rolling reduction of the top is reduced during the last rolling process of the strip steel; during rolling of the tail, when 10-18 m of the tail length remains, the actual roll gap is adjusted gradually to S plus 0.5 mm-S plus 1.5 mm, S represents a target roll gap which refers to a roll gap set between upper and lower work rolls of the mill according to a calculation instruction. The gauge control technique has the advantages that high rolling reduction is performed on the top and tail of the strip steel, so that not only is thickness tolerance of the top and tail of the strip steel reduced and the rolling yield improved, but also roll damage accidents due to strip steel clamp by the rolls are avoided.
Description
Technical field
The present invention relates to a kind of THICKNESS CONTROL technique of volume stove milling train hot-strip head-tail.
Background technology
Single chassis volume stove milling train is to enter, export both sides, the reciprocal rolling of realization with steel by possess to batch with the volume stove of heating function is arranged on finishing mill simultaneously.The major function of volume stove is to guarantee band steel temperature in the operation of rolling, band steel in reciprocal multi-pass rolling process due to threading repeatedly, band steel toe tail with extraneous time of contact long thermal loss large.In addition,, owing to directly contacting and also can cause certain thermal loss, these thermal loss to aggravate the temperature difference with head-tail with steel middle part with steel toe tail and the rolling drum in volume stove, cause being with steel toe afterbody plasticity variation THICKNESS CONTROL difficulty.Head-tail also can aggravate the super thick situation of afterbody in the situation that losing tension force simultaneously.Thickness exceedes the tolerance upper limit and needs excision end to end, affects casting yield.
It is to carrying out continuous measurement or estimation with the actual thickness that shuts out of steel by calibrator or sensor that thickness is controlled (Automatic gauge Control) automatically, and according to the deviation signal of measured value and set-point, by means of control loop and control device, by change depressing position, mill speed etc. THICKNESS CONTROL the method in the deviation range allowing.The system that the thickness of rolled piece is controlled within the specific limits is automatically called automatic gauge control system (being called for short AGC).
At present main AGC control method comprises: pressure AGC (BISRA AGC), monitoring AGC(MONITOR AGC), feed-forward AGC (FF AGC), acceleration and deceleration AGC(ACC and DEC AGC), end-compensated AGC(TOP and TAIL Edge Compensation end to end).Actual production is to steel toe tail, super thick that work is mainly end-compensated AGC(TOP and TAIL Edge Compensation end to end).
End-compensated AGC(TOP and TAIL Edge Compensation end to end), be mainly to take the control strategy of taper under suppressing with steel end certain length, drafts and depress length by Secondary computer control system.
Summary of the invention
Technical problem to be solved by this invention is: the feature that provides a kind of poor roll-force of head-tail temperature inductile of considering to roll up stove rolling mill strip steel greatly easily to sting steel, and avoid head-tail to suppress the not impaired THICKNESS CONTROL technique with steel toe afterbody of district's overvoltage protection roll simultaneously.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of THICKNESS CONTROL technique of volume stove milling train hot-strip head-tail, comprise the steps, band steel after roughing finishes is sent in finishing mill, band steel just can complete after need to back and forth rolling rolling requirement through mm finishing mill unit N road according to technological requirement, in the operation of rolling, that end that is introduced into milling train with steel is head, after that end of entering be afterbody, when calendering, set one at band steel toe afterbody and suppress district, the length setting of suppressing district is 0～30m, actual intermesh determination is S～S-2.5mm, band steel is in the end in one operation of rolling time, the strong drafts of head reduces, afterbody is in the time of rolling, in the time of tail length remainder 10～18m, actual roll gap is progressively adjusted to S+0.5mm～S+1.5mm, S is target roll gap, target roll gap refers to the roll gap of setting according to computations between milling train upper working rolls and lower working rolls.
Roller-way between roughing and finish rolling is laid stay-warm case.
Finishing mill calendering working roll adopts high-speed steel roll.
Head-tail increases vortex induction heater.
With steel, in the process of whole finish rolling rolling, the temperature of retainer belt steel maintains 1000～1060 ℃.The invention has the beneficial effects as follows: suppress section length and strong drafts by optimal control, final pass afterbody roll gap is suitably opened, super thick the reducing of band steel toe tail thickness that assurance is produced, protects again roll can not damage.Effectively alleviate head and tail temperature difference by volume stove intensification roller-way Insulation, improve the actual 2～3m that reduces of super thick successful end to end.By using the high-speed steel roll of high rigidity, high-speed steel roll non-deformability obviously promotes, and the ability of depressing obtains fine performance, and to improving, super thick effect is remarkable end to end.Actually reduce super thick 5～8m.
The specific embodiment
Describe specific embodiment of the invention scheme below in detail.
A kind of THICKNESS CONTROL technique of volume stove milling train hot-strip head-tail, comprise the steps, band steel after roughing finishes is sent in finishing mill, band steel just can complete after need to back and forth rolling rolling requirement through mm finishing mill unit N road according to technological requirement, in the operation of rolling, that end that is introduced into milling train with steel is head, after that end of entering be afterbody, when calendering, set one at band steel toe afterbody and suppress district, the length setting of suppressing district is 0～30m, actual intermesh determination is S～S-2.5mm, band steel is in the end in one operation of rolling time, the strong drafts of head suitably reduces, afterbody is in the time of rolling, in the time of tail length remainder 10～18m, target roll gap is progressively adjusted to S+0.5mm～S+1.5mm, S is target roll gap, target roll gap refers to the roll gap of setting according to computations between milling train upper working rolls and lower working rolls, sting steel accident to avoid roll overvoltage.
Dwindle slab end to end with the middle temperature difference.For guaranteeing that rolling temperature dwindles head and tail temperature difference, the method for having taked the roller-way between roughing and finish rolling to lay stay-warm case, to improve board briquette, dwindles head and tail temperature poor.After implementing, intermediate blank temperature improves 20 ℃, dwindles 5 ℃ of left and right of the temperature difference (1060～1100 ℃ of supplied materials temperature) at head-tail and middle part.
Improve finishing mill roll rigidity.Finishing mill calendering working roll adopts high-speed steel roll, and the rigidity of the more common unlimited chilled cast iron roll of rigidity of high-speed steel roll is high by 30%, i.e. the ability of high-speed steel roll opposing strain is obviously better than infinitely chilled cast iron roll.Actual effect shows to take high rigidity roll to roll the super thick 5～8m that reduced of identical 4 feet of 3.0mm, improves effect very obvious.
Thermal loss compensation end to end.Take certain mode of heating (eddy-current heating) to compensate temperature loss end to end at preseting length end to end, guarantee the uniformity of material total length temperature.With steel, in the process of whole finish rolling rolling, the temperature of retainer belt steel maintains 1000～1060 ℃.Reduce the temperature loss that strip contacts with rolling drum, take to roll up stove and heat up.Because Steckel Mill needs repeatedly threading, strip needs to be wrapped in rolling drum end to end, if the temperature of rolling drum is lower than belt steel temperature, head and tail temperature loss is serious, and the temperature contrast that this can aggravate with steel head, middle and end, affects THICKNESS CONTROL end to end.Take rising volume furnace temperature, to improving rolling drum temperature (in original stove, 980 ℃ of temperature, now set 1000～1060 ℃), reduce rolling drum and cause the thermal loss with steel toe tail, alleviate the controlled pressure of end-compensated AGC end to end, and then improve super thick raising thickness and precision end to end end to end.
Head-tail increases vortex induction heater, and control head Tail-heating length and increasing extent of temperature are alleviated head and tail temperature difference.
Claims (5)
1. the THICKNESS CONTROL technique of volume stove milling train hot-strip head-tail, it is characterized in that: comprise the steps, band steel after roughing finishes is sent in finishing mill, band steel just can complete after need to back and forth rolling rolling requirement through mm finishing mill unit N road according to technological requirement, in the operation of rolling, that end that is introduced into milling train with steel is head, after that end of entering be afterbody, when calendering, set one at band steel toe afterbody and suppress district, the length setting of suppressing district is 0 ~ 30m, actual intermesh determination is S ~ S-2.5mm, band steel is in the end in one operation of rolling time, the strong drafts of head reduces, afterbody is in the time of rolling, in the time of tail length remainder 10 ~ 18m, actual roll gap is progressively adjusted to S+0.5mm ~ S+1.5mm, S is target roll gap, target roll gap refers to the roll gap of setting according to computations between milling train upper working rolls and lower working rolls.
2. the super thick control technique of thickness of volume stove milling train hot-strip head-tail according to claim 1, is characterized in that: the roller-way between roughing and finish rolling is laid stay-warm case.
3. the super thick control technique of thickness of volume stove milling train hot-strip head-tail according to claim 1, is characterized in that: finishing mill calendering working roll adopts high-speed steel roll.
4. the super thick control technique of thickness of volume stove milling train hot-strip head-tail according to claim 1, is characterized in that: head-tail increases vortex induction heater.
5. the THICKNESS CONTROL technique of volume stove milling train hot-strip head-tail according to claim 1, is characterized in that: with steel, in the process of whole finish rolling rolling, the temperature of retainer belt steel maintains 1000 ~ 1060 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310617208.3A CN103801565B (en) | 2013-11-27 | 2013-11-27 | Roll up the thickness control technique of stove milling train hot-strip head-tail |
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| CN201310617208.3A CN103801565B (en) | 2013-11-27 | 2013-11-27 | Roll up the thickness control technique of stove milling train hot-strip head-tail |
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| CN103801565A true CN103801565A (en) | 2014-05-21 |
| CN103801565B CN103801565B (en) | 2018-01-09 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104384201A (en) * | 2014-10-13 | 2015-03-04 | 南京钢铁股份有限公司 | Method for preventing great under-pressure distribution change in steel rolling process |
| CN105327938A (en) * | 2015-11-11 | 2016-02-17 | 张家港浦项不锈钢有限公司 | Method for using steckel mill for producing stainless steel for producing titanium plate |
| CN107030108A (en) * | 2017-04-21 | 2017-08-11 | 中铝瑞闽股份有限公司 | A kind of rafifinal target heavy reduction rolling method |
| CN107377632A (en) * | 2017-08-11 | 2017-11-24 | 张家港联峰钢铁研究所有限公司 | It is a kind of to reduce reinforcing bar size poor temperature control system and operating method end to end |
| CN109663814A (en) * | 2018-11-19 | 2019-04-23 | 包头钢铁（集团）有限责任公司 | A method of reduce think gauge abrasion-resistant stee steel plate end to end with plate body thickness difference |
| CN111957751A (en) * | 2020-07-10 | 2020-11-20 | 北京科技大学设计研究院有限公司 | Method for controlling head and tail thinning wedge in reversible rolling process of steckel mill |
| CN112692058A (en) * | 2021-01-07 | 2021-04-23 | 唐山燕山钢铁有限公司 | Rolling process for controlling thickness stability of non-oriented silicon steel |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104384201A (en) * | 2014-10-13 | 2015-03-04 | 南京钢铁股份有限公司 | Method for preventing great under-pressure distribution change in steel rolling process |
| CN104384201B (en) * | 2014-10-13 | 2016-04-27 | 南京钢铁股份有限公司 | A kind of rolling process of avoiding depresses the method for distributing and changing greatly |
| CN105327938A (en) * | 2015-11-11 | 2016-02-17 | 张家港浦项不锈钢有限公司 | Method for using steckel mill for producing stainless steel for producing titanium plate |
| CN105327938B (en) * | 2015-11-11 | 2017-12-15 | 张家港浦项不锈钢有限公司 | A kind of stainless steel production steekle mill is used for the method for producing titanium plate |
| CN107030108A (en) * | 2017-04-21 | 2017-08-11 | 中铝瑞闽股份有限公司 | A kind of rafifinal target heavy reduction rolling method |
| CN107377632A (en) * | 2017-08-11 | 2017-11-24 | 张家港联峰钢铁研究所有限公司 | It is a kind of to reduce reinforcing bar size poor temperature control system and operating method end to end |
| CN107377632B (en) * | 2017-08-11 | 2020-03-27 | 张家港联峰钢铁研究所有限公司 | Temperature control system for reducing head-tail size difference of reinforcing steel bars and operation method |
| CN109663814A (en) * | 2018-11-19 | 2019-04-23 | 包头钢铁（集团）有限责任公司 | A method of reduce think gauge abrasion-resistant stee steel plate end to end with plate body thickness difference |
| CN111957751A (en) * | 2020-07-10 | 2020-11-20 | 北京科技大学设计研究院有限公司 | Method for controlling head and tail thinning wedge in reversible rolling process of steckel mill |
| CN112692058A (en) * | 2021-01-07 | 2021-04-23 | 唐山燕山钢铁有限公司 | Rolling process for controlling thickness stability of non-oriented silicon steel |
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| CN103801565B (en) | 2018-01-09 |
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Address after: 215625 Puxiang (Zhangjiagang) Stainless Steel Co., Ltd. on the north side of the Yangtze River Highway, Jinfeng Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: POSCO (ZHANGJIAGANG) STAINLESS STEEL Co.,Ltd. Address before: 215625 Zhangjiagang Puxiang Stainless Steel Co., Ltd., Jinfeng Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee before: ZHANGJIAGANG POHANG STAINLESS STEEL Co.,Ltd. |
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Effective date of registration: 20190326 Address after: 110122 Puxiang (Liaoning) Automobile Parts Manufacturing Co., Ltd. No. 123, Dadong District Construction Road, Shenyang City, Liaoning Province Patentee after: Puxiang (Liaoning) Automotive Parts Manufacturing Co.,Ltd. Address before: 215625 Puxiang (Zhangjiagang) Stainless Steel Co., Ltd. on the north side of the Yangtze River Highway, Jinfeng Town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee before: POSCO (ZHANGJIAGANG) STAINLESS STEEL Co.,Ltd. |