CN103008361B - Method for controlling bending of steel plate head - Google Patents

Method for controlling bending of steel plate head Download PDF

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Publication number
CN103008361B
CN103008361B CN201210569790.6A CN201210569790A CN103008361B CN 103008361 B CN103008361 B CN 103008361B CN 201210569790 A CN201210569790 A CN 201210569790A CN 103008361 B CN103008361 B CN 103008361B
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China
Prior art keywords
steel plate
nipping
speed
steel
rolling
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Withdrawn - After Issue
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CN201210569790.6A
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Chinese (zh)
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CN103008361A (en
Inventor
刘泽田
董瑞峰
张大治
刘海涛
柳志钢
张晓燕
刘哲
杨永鹏
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Baotou Iron and Steel Group Co Ltd
Inner Mongolia Baotou Steel Union Co Ltd
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Baotou Iron and Steel Group Co Ltd
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Priority to CN201210569790.6A priority Critical patent/CN103008361B/en
Publication of CN103008361A publication Critical patent/CN103008361A/en
Application granted granted Critical
Publication of CN103008361B publication Critical patent/CN103008361B/en
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Abstract

The invention discloses a method for controlling the bending of a steel plate head. According to the method, by regulating and optimizing the nipping length and the nipping speed of a steel plate during a rolling process, the bending extent and the bending shape of the steel plate head are controlled. The nipping steel parameters include: the nipping speed and nipping length. The bending extend of the steel plate and the shape of the low temperature zone of the steel plate head after rolling are controlled by adjusting and optimizing the nipping speed and the nipping length of the steel plate. A strategy of nipping steel at low speed and rolling at high speed is adopted for steel rolling, namely the nipping steel at the low speed is carried out in a set nipping length range, and when the rolling length exceeds the nipping speed, the rolling is carried out at a raised speed. By the adoption of the method, part of defects in a traditional control method are made up, the manufactured steel plate head has an excellent shape, which is straight or slightly bends upwards, and the cutting damage caused by the bending in the head and a poor shape is reduced.

Description

A kind of method controlling Front End Bending of Plate
Technical field
The invention belongs to hot rolled heavy plate technical field, specifically, relate to a kind of method controlling Front End Bending of Plate.
Background technology
Cut deal is after rolling, desirable plate shape is that head is straight, but presents buckling phenomenon in various degree at actual production process light plate head, is divided into and is bent downwardly " nose " and is bent upwards " discount ", (referring to Fig. 1), the bending status of operation of rolling steel plate as shown in Figure 2.Usually, cause Front End Bending of Plate because have: steel billet upper and lower surface temperature inequality, milling train upper and lower working roll rotating speed difference, the upper and lower work roll diameter difference of milling train, single pass reduction ratio etc.
Number of patent application is 03113203.0, and name is called " rolled member head shape controlling method ", provides a kind of method improving head-bent by changing upper working rolls and lower working rolls rotating speed; Number of patent application is 201010351038.0, name is called " a kind of novel board-shape control method of heavy and medium plate mill ", by last passage in the operation of rolling is set as planishing pass, and set the solution head-bent phenomenons such as suitable mill speed, gap values between rollers, roll-force.
In prior art, controlled by constantly studying steel plate head buckling phenomenon, although often the degree of crook of steel plate head is controlled, steel plate head shape also has elbow phenomenon to exist, and bad plate shape as shown in Figure 3.
Summary of the invention
Technical problem solved by the invention is to provide a kind of method controlling Front End Bending of Plate, makes to roll rear steel plate head straight or micro-ly to stick up, and then improves lumber recovery.
Technical scheme is as follows:
Control a method for Front End Bending of Plate, come the degree of crook of steel plate and the shape of steel plate head low-temperature space after controlled rolling by adjustment, the steel parameter of stinging of optimizing steel plate; Described steel parameter of stinging comprises biting speed and length of nipping, and adjust described biting speed according to Front End Bending of Plate degree and low-temperature space curved shape, guarantee that steel plate head is good, the scope of described biting speed is between 1.0m/s-2.0m/s; To nip length according to Front End Bending of Plate degree and the adjustment of low-temperature space curved shape, guarantee that steel plate head is good, described in nip the scope of length between 0.2m-1.0m; Steel rolling adopts low speed to sting the strategy of steel high-speed rolling, namely carries out low speed at the length of interval of nipping set and stings steel, just start increasing speed rolling when mill length exceedes and nips length.
Further: in the operation of rolling according to Front End Bending of Plate degree and low-temperature space curved shape, continue to optimize each passage steel plate biting speed and length of nipping, guarantee that steel plate head shape is good.
Technique effect of the present invention comprises:
1, the present invention is from the biting speed of steel plate and length angle of nipping when optimizing steel rolling; provide a kind of method of simple and effective control Front End Bending of Plate phenomenon; make to roll rear steel plate head straight or micro-ly to stick up, to proterctive equipment, improve plate shape and then improve lumber recovery and have important meaning.
2, adopt the inventive method to compensate for the segmental defect of traditional control method, the steel plate head shape of output is good, in straight or micro-ly stick up shape, decrease cause because of head-bent and shape defect cut damage.
Accompanying drawing explanation
Fig. 1 is that prior art light plate rolls rear steel plate head bending schematic diagram up and down;
Fig. 2 is prior art light plate head-bent schematic diagram in the operation of rolling;
Fig. 3 is to Front End Bending of Plate bad plate shape schematic diagram Ex post in prior art;
Fig. 4 is the speed time curve figure in the light plate operation of rolling of the present invention;
Fig. 5 is the temperature profile of operation of rolling light plate in the present invention;
Fig. 6 is the schematic diagram that light plate head plate shape of the present invention is good.
Detailed description of the invention
This patent is studied from the control of another angle to Front End Bending of Plate phenomenon, by the biting speed of control steel plate and the head-bent of nip length and then control steel plate, avoid steel plate head to occur bad plate shape shown in bending and Fig. 3, be specially adapted to 550MPa and the control of above high strength steel plate head-bent.The inventive method controls Front End Bending of Plate degree and curved shape by nip length and the biting speed of adjusting and optimizing operation of rolling light plate, can according to actual conditions simultaneously or select wherein a certain item parameter to adjust in practical operation.
In the present invention, Plate Rolling Process adopts low speed to sting the strategy of steel, increasing speed rolling, low speed throwing steel, and the rate curve of its operation of rolling is shown in Fig. 4.
Cut deal in rolling, treat the uneven heat radiation of plate body in warm process, at de-scaling water, frame cooling water, roller-way cooling water and with under the factor effects such as the heat exchange of surrounding environment, steel plate body periphery dispels the heat and comparatively wants fast in the middle part of plate body, therefore steel plate body peripheral temperature low (steel plate integral slab body Temperature Distribution is see Fig. 5).And to prolong width, thickness direction and length direction each several part temperature at low-temperature space be also uneven, when this part is out of shape, degree of irregularity is serious, exacerbates the tendency producing bad plate shape.Feature of the present invention is that setting rational biting speed stings steel parameter with length etc. of nipping, good to guarantee the steel plate head after rolling.
Rolled piece roll driving motor after milling train of nipping bears load, and therefore decline to a certain degree can occur motor speed, and then roll rotational speed is declined.When milling train is unloaded, top and bottom rolls rotating speed is consistent, and after stinging steel, decline in various degree occurs top and bottom rolls rotating speed, such that steel plate head upper and lower surface deformation velocity is inconsistent and then bending phenomenon occurs.Therefore need to set rational biting speed, when milling train bearing load, the decline of top and bottom rolls rotating speed is unlikely to the uniformity obviously having influence on the distortion of steel plate upper and lower surface, generally according to the difference of steel grade, specification, biting speed is set as 1.0m/s-2.0m/s.
Mentioning steel rolling above adopts low speed to sting the strategy of steel high-speed rolling, namely carries out low speed at the length of interval of nipping set and stings steel, just start increasing speed rolling when mill length exceedes and nips length.When length of nipping is shorter, the length of nipping of steel plate is less than cerebral cryotherapy segment length, such steel plate is stung after steel through low speed and is just started increasing speed rolling at low-temperature space, the phenomenon making top and bottom rolls that rotating speed occur because bearing different loads to decline in various degree, thus has influence on steel plate head shape.When length of nipping is longer, although be unlikely to occur in the phenomenon of low-temperature zone just increasing speed rolling, say that oversize length of nipping also is irrational from the angle of enhancing productivity.Be generally 0.2m-1.0m according to the difference of steel grade, specification length setting of nipping.
The present invention is from the biting speed of steel plate when optimizing steel rolling and nip length angle; provide a kind of method of simple and effective control Front End Bending of Plate phenomenon; make to roll rear steel plate head straight or micro-ly to stick up; to proterctive equipment, improve plate shape so that improve lumber recovery have important meaning, good steel plate head is as shown in Figure 6.
Below embody rule of the present invention is elaborated.
Application 1:
Control a method for Warping Phenomenon in Plate Rolling Process, namely on the basis of traditional control method by adjustment steel plate biting speed, length of nipping and then make steel plate head straight or micro-ly to stick up.For rolling 20mm Q550D, length setting of nipping is 0.7m, biting speed is set as 1.5m/s, it is good that steel plate rolls rear glacing flatness, head " does not upwarp " or " lower button " largely, as shown in Figure 6, meanwhile, there is not the bad shape shown in Fig. 3 in cerebral cryotherapy district in true form yet.
Application 2:
Control a method for Warping Phenomenon in Plate Rolling Process, namely on the basis of traditional control method by adjustment steel plate biting speed, length of nipping and then make steel plate head straight or micro-ly to stick up.For rolling 30mm Q690D, length setting of nipping is 0.6m, biting speed is set as 1.65m/s, it is good that steel plate rolls rear glacing flatness, head " does not upwarp " or " lower button " largely, as shown in Figure 6, meanwhile, there is not the bad shape shown in Fig. 3 in cerebral cryotherapy district in true form yet.

Claims (2)

1. control a method for Front End Bending of Plate, it is characterized in that: come the degree of crook of steel plate and the shape of steel plate head low-temperature space after controlled rolling by adjustment, the steel parameter of stinging of optimizing steel plate; Described steel parameter of stinging comprises biting speed and length of nipping, and adjust described biting speed according to Front End Bending of Plate degree and low-temperature space curved shape, guarantee that steel plate head is good, the scope of described biting speed is between 1.0m/s-2.0m/s; To nip length according to Front End Bending of Plate degree and the adjustment of low-temperature space curved shape, guarantee that steel plate head is good, described in nip the scope of length between 0.2m-1.0m; Steel rolling adopts low speed to sting the strategy of steel high-speed rolling, namely carries out low speed at the length of interval of nipping set and stings steel, just start increasing speed rolling when mill length exceedes and nips length.
2. the method controlling Front End Bending of Plate as claimed in claim 1, it is characterized in that: in the operation of rolling according to Front End Bending of Plate degree and low-temperature space curved shape, continue to optimize each passage steel plate biting speed and length of nipping, guarantee that steel plate head shape is good.
CN201210569790.6A 2012-12-25 2012-12-25 Method for controlling bending of steel plate head Withdrawn - After Issue CN103008361B (en)

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Application Number Priority Date Filing Date Title
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Publication number Priority date Publication date Assignee Title
CN103230943B (en) * 2013-04-28 2016-04-20 内蒙古包钢钢联股份有限公司 Improve the method for Warping Phenomenon in Plate Rolling Process
CN103302106B (en) * 2013-07-09 2015-04-08 济钢集团有限公司 Thick steel plate straightness improvement method and control method thereof in rolling process
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
CN112718873B (en) * 2020-12-14 2022-07-12 攀钢集团攀枝花钢钒有限公司 Method for improving straightness of front end part of steel rail
CN113333479B (en) * 2021-06-08 2022-04-12 大力神铝业股份有限公司 Method for head upturned deformation in aluminum alloy plate rolling process

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JPH01241314A (en) * 1988-03-24 1989-09-26 Sumitomo Metal Ind Ltd Method for controlling plate camber in hot rolling mill
JP4089658B2 (en) * 2004-06-29 2008-05-28 住友金属工業株式会社 Steel plate manufacturing method
CN102527735A (en) * 2011-12-23 2012-07-04 秦皇岛首秦金属材料有限公司 Method for controlling even deformation of edge portion in medium-thick board rolling

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