CN104492821A - Control method for cold-rolling widthof ferrite stainless steel - Google Patents
Control method for cold-rolling widthof ferrite stainless steel Download PDFInfo
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- CN104492821A CN104492821A CN201410743685.9A CN201410743685A CN104492821A CN 104492821 A CN104492821 A CN 104492821A CN 201410743685 A CN201410743685 A CN 201410743685A CN 104492821 A CN104492821 A CN 104492821A
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- tapering
- intermediate roll
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/22—Lateral spread control; Width control, e.g. by edge rolling
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Abstract
The invention provides a control method for the cold-rolling widthof ferrite stainless steel. The control method comprises the following steps: performing edge plate shape control by a pair of first middle rolls and a working roll between the pair of first middle rolls, wherein only one end of each first middle roll in the pair of first middle rolls is tapered and forms a taper end; taking the roll change critical value w as a distinguishing point, and for a steel plate with the rolling width of not smaller than w, adopting first taper length and first taper at the taper end of the first middle roll; for a steel plate with the rolling width of smaller than w, adopting second taper length and second taper at the taper end of the first middle roll. According to the control method, the production performance of 400 series stainless steel can be remarkably improved, the casting yield and the quality are normal, and no other accidents such as belt breaking and edge cracking are caused.
Description
Technical field
The present invention relates to field of metallurgy, be specifically related to the cold rolling process of steel plate, be i.e. the cold rolling width control method of a kind of ferritic stainless steel.
Background technology
In existing stainless-steel cold-rolling technology, two that milling train first intermediate roll has is all with tapering.But this roller just has no idea to adjust steel edge portion, and often kind of width all obtains the long intermediate calender rolls of corresponding different tapering difference cone.In order to address this problem, sendzimir mill provides an a kind of moveable intermediate calender rolls.This roller is all generally the Front-end Design tapering at a upper intermediate calender rolls, the rear end design tapering of next intermediate calender rolls.In 20 roller mills, an intermediate calender rolls be all one end with tapering, and two rollers move simultaneously above, below two rollers be also like this.By moving in an intermediate calender rolls, edge roll gap reduces, and is used for correcting limit wave.
But first intermediate roll adjustment difficulty during ferritic stainless steel (400 is steel grade ultra-wide volume) rolling, the upper limit of traversing amount under exceeding this tapering, rear a few passage loses plate form control ability substantially, the production accident such as flanging, broken belt is easily there is during operation, and operation of cannot raising speed, affect productivity, the moderate rate of hourly output is all about 60%.Rolling (400 is normal volume) is if employing portion suitably bores the first intermediate roll of long tapering, and band steel just easily edge overvoltage occurs, middle waviness, carries out plate form control have very large obstruction for doing industry, and also very likely flange during production, causes broken belt accident.
In sum, in prior art, there is following problem: cold rolling for the ferritic stainless steel (such as 400 is steel grade) under different in width, easily occur flanging, broken belt problem.
Summary of the invention
The invention provides the cold rolling width control method of a kind of ferritic stainless steel, to solve the cold rolling of ferritic stainless steel (such as 400 is steel grade) under different in width, easily occur flanging, broken belt problem.
For this reason, the present invention proposes the cold rolling width control method of a kind of ferritic stainless steel, and the cold rolling width control method of described ferritic stainless steel comprises:
A pair first intermediate roll and the working roll between described a pair first intermediate roll is adopted to carry out edge plate profile control;
Each first intermediate roll in described a pair first intermediate roll only has one end with tapering, and each first intermediate roll forms tapering end at this end; Described tapering end comprises: the outer cone section being positioned at the outermost end of described first intermediate roll, and the tapering of described outer cone section is definite value;
The cold rolling width control method of described ferritic stainless steel for w is for diacritical point, is more than or equal to the steel plate of w with steel plate rolling width for rolling width, the outer cone section of the tapering end of described first intermediate roll adopts the first cone length and the first tapering; Rolling width is less than to the steel plate of w, the outer cone section of the tapering end of described first intermediate roll adopts the second cone length and the second tapering.
Further, the steel grade of described ferritic stainless steel is 400 is steel grade, w=1275mm, and the first cone is long is 350mm, and the first tapering is the 0.875, the second cone length is 390mm, and the second tapering is 0.975.
Further, in the operation of rolling, comparatively odd-numbered pass is low for even-numbered pass operation hourly velocity.
Further, when steel plate rolling width is 1260mm, first intermediate roll stroke is 220mm, and the traversing amount of first intermediate roll is: lap=220/2+390-(948-630)=182mm during first intermediate roll stroke/2+ centre position.
Further, when steel plate rolling width is 1290mm, the traversing amount of first intermediate roll is: lap=220/2+350-(948-645)=157mm during first intermediate roll stroke/2+ centre position.
The object of the present invention is to provide a kind of milling method of the ferritic stainless steel (400 is steel grade) that can improve under different in width.Plate form control is carried out respectively by the first intermediate roll adopting difference to bore length and tapering to steel plate or the band steel of different in width, the traversing amount of effective control or adjustment first intermediate roll, thus control or adjust the lap of first intermediate roll and steel plate or steel edge portion, overcome the flanging, the broken belt problem that adopt the steel plate of the first intermediate roll rolling different in width of single cone length and tapering or band steel to bring, mill speed can be improved, increase productivity and improve output, realize the maximum gain that 400 are steel grade.
Further, the present invention take w as separation or the diacritical point of the width of steel plate or band steel, rolling width is more than or equal to the steel plate of w, and the outer cone section of the tapering end of described first intermediate roll adopts the first cone length and the first tapering; Rolling width is less than to the steel plate of w, by roll change, the outer cone section of the tapering end of described first intermediate roll adopts the second cone length and the second tapering, like this, simplify cone length and the mould taper control model of first intermediate roll in steel plate or the production of band steel, facilitate roll change and operation.
And then the present invention carries out interval division so that 1275mm is wide for separation, this is the ideal selection that the actual features of steel grade rolling and working condition are made according to 400.Like this, can rolling ferritic stainless steel (400 is steel grade) smoothly, and avoid flanging, the generation of the production accident such as limit is split, broken belt, and under the optimization of other parameters, improve mill speed, increase productivity and improve output, realize the maximum gain that 400 are steel grade.
Accompanying drawing explanation
Fig. 1 is the structural representation of first intermediate roll of the present invention;
Fig. 2 is operation principle schematic diagram of the present invention, wherein, clear in order to show, and eliminates working roll, only display first intermediate roll and steel plate.
Drawing reference numeral illustrates: working roll 5 steel plate of working roll 4 bottom on first intermediate roll 3 top of first intermediate roll 2 bottom on 1 top or band steel 11 tapering end 50 rolling centerline
Detailed description of the invention
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the present invention is described.
As shown in Figure 1, the present invention proposes the cold rolling width control method of a kind of ferritic stainless steel, and for rolled plate 5, the cold rolling width control method of described ferritic stainless steel comprises:
A pair first intermediate roll (comprising: the first intermediate roll 1 on top and the first intermediate roll 2 of bottom) and the working roll between described a pair first intermediate roll (comprising: the working roll 3 on top and the working roll 4 of bottom) is adopted to carry out edge plate profile control;
Each first intermediate roll in described a pair first intermediate roll only has one end with tapering, and each first intermediate roll forms tapering end 11 at this end; Such as, the structure of the first intermediate roll 1 on top and the first intermediate roll 2 of bottom and measure-alike, the tapering end 11 of the first intermediate roll 1 on top and the first intermediate roll 2 of bottom lays respectively at the both sides of steel plate; Described tapering end comprises: the outer cone section being positioned at the outermost end of described first intermediate roll, and the tapering of described outer cone section is definite value; In addition, described tapering end can also comprise: therefore ecto-entad is connected to middle cone section and the inner cone section of outer cone section the inner; To realize more complete and to control template accurately; Such as, the cone length of middle cone section and tapering are 165 and 0.18, the cone length of inner cone section and tapering are 350 and 0.875, the tapering of described middle cone section and inner cone section reduces gradually, for different first intermediate rolls, the cone of the outer cone section of each roller is long and tapering difference is comparatively obvious, and the middle cone section of each roller and the cone of inner cone section are grown can be identical or numerical approximation is equal with tapering;
The cold rolling width control method of described ferritic stainless steel for diacritical point, is more than or equal to the steel plate of w with roll change critical value w for rolling width, the tapering end of described first intermediate roll adopts the first cone length and the first tapering; Rolling width is less than to the steel plate of w, the tapering end of described first intermediate roll adopts the second cone length and the second tapering, and the effective width (effectiveflat) of steel plate is E.
The present invention and the main distinction of prior art are the steel plate of different in width or are with steel to adopt differently to bore first intermediate roll (outer cone section) that is long and tapering and carry out plate form control respectively, to adjust the lap of first intermediate roll and steel plate or steel edge portion, with roll change critical value w for diacritical point, steel plate or the band steel of rolling different in width adopt different first intermediate rolls, or when the steel plate of rolling different in width or band steel, the first intermediate roll of different cone length and tapering be used instead.Main change of the present invention occurs in the adjustment of first intermediate roll and other relevant parameters, and such as, the difference of different first intermediate rolls is cone length and tapering, in addition, can also have the difference of other parameters such as working roll roughness.In the present invention, other rolling parameters do not mentioned and overall milling method can adopt technology same as the prior art.
Further, the steel grade of described ferritic stainless steel is 400 is steel grade, w=1275mm, and the first cone is long is 350mm, and the first tapering is the 0.875, the second cone length is 390mm, and the second tapering is 0.975.Like this, be that the modelling made according to actual rolling situation is selected, tackle different situations in time when to be convenient to operation 400 be steel grade, correctly rolling 400 is steel grade safely.
For 1275mm width distinguishing: because design slope is fixed, the design of tapering size grows up to direct ratio with cone, the long effective section length obtained of corresponding different cones is different, and slope is fixed, and bore longer, maximum effective section length is longer, therefore table 1 is pressed in design:
Whether the milling method of ferritic stainless steel of the present invention, comprises material preparation, uncoiling, welding, rolling, roll change, in described material preparation step, checks material surface condition, is confirmed whether super thick, ultra-wide, carries out interval division so that 1275mm is wide for intermediate point.
Further, in the operation of rolling, comparatively odd-numbered pass is low for even-numbered pass operation hourly velocity.Adopt even-numbered pass drafts suitably to increase, increase even-numbered pass roll-force, reduce and skid; Prevent skidding from suitably can increase total, front and back poor (toe-out-posttension=2 ton (Ton) → toe-out-posttension=3 ton (Ton)), roller system parameter carries out according to table 2, and packing paper uses and carries out according to table 3; Plate shape roller, turning roll surface must be polished inspection, roller surface inspection, confirm foreign.The roll change cycle carries out according to table 4;
Table 2: roller system parameter table
1
stiMR: first intermediate roll
2
ndiMR: the second intermediate calender rolls
Table 3: packing paper uses table
Table 4: roll change periodic table
When steel plate or strip width < 1275mm: the first intermediate roll adopting cone length=390mm, tapering=0.975.First intermediate roll design conditions is as follows: with 1260mm width for benchmark is mainly 409L/410L/430 (400 owners want steel grade), as shown in Figure 2, long m=390mm tapering=0.975 of cone of first intermediate roll, with rolling centerline 50 for benchmark, the overall length k of first intermediate roll is 948mm, wherein, the distance of the tapering end distance rolling centerline 50 of first intermediate roll is k/2, the distance of the non-tapering end distance rolling centerline 50 of first intermediate roll is k/2, the distance of edges of plate, every side distance rolling centerline 50 is w/2, now the traversing amount of first intermediate roll is: lap=220/2+390-(948-630)=182 during first intermediate roll stroke/2+ centre position, (948 is k/2, refer to the mathematics length algorithm of utilization when calculating overlapping), during operation 1260mm width coil of strip, the traversing amount of boring the first intermediate roll of long 390mm* tapering 0.975 is: 0-182 (full stroke 220, 220 is hydraulic cylinder travels), when namely first intermediate roll stroke is more than 182 just there is not lap in steel edge portion, productivity promotes obviously, casting yield is normal, quality is normal, other accidents such as to split without broken belt limit.
When steel plate or strip width >=1275mm: first intermediate roll adopts cone length=350mm, tapering=0.875.First intermediate roll design conditions is as follows: with 1290mm width for benchmark, steel grade is mainly 409L, 430L (400 owners want steel grade), cone length=350mm tapering=0.875, now the traversing amount of first intermediate roll is: lap=220/2+350-(948-645)=157 during first intermediate roll stroke/2+ centre position, during operation 1290mm width coil of strip, the traversing amount of boring the first intermediate roll of long 350mm*0.875 is: 0-157 (full stroke 220), when namely first intermediate roll stroke is more than 157 just there is not lap in steel edge portion, now adjust the traversing amount DeGrain of first intermediate roll.Sum up: in this situation, first intermediate roll regulated quantity is sufficient.
Stainless-steel cold-rolling method of the present invention, 400 can be made to be that productivity promotes obviously, and casting yield is normal, and quality is normal, without broken belt, while other accidents such as to split.
The foregoing is only the schematic detailed description of the invention of the present invention, and be not used to limit scope of the present invention.For each part of the present invention can mutually combine under the condition of not conflicting, any those skilled in the art, equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.
Claims (6)
1. the cold rolling width control method of ferritic stainless steel, is characterized in that, the cold rolling width control method of described ferritic stainless steel comprises:
A pair first intermediate roll and the working roll between described a pair first intermediate roll is adopted to carry out edge plate profile control;
Each first intermediate roll in described a pair first intermediate roll only has one end with tapering, and each first intermediate roll forms tapering end at this end; Described tapering end comprises: the outer cone section being positioned at the outermost end of described first intermediate roll, and the tapering of described outer cone section is definite value;
The cold rolling width control method of described ferritic stainless steel is with roll change critical value w for diacritical point, and W is more than or equal to 800mm, rolling width is more than or equal to the steel plate of w, and the outer cone section of the tapering end of described first intermediate roll adopts the first cone length and the first tapering; Rolling width is less than to the steel plate of w, the outer cone section of the tapering end of described first intermediate roll adopts the second cone length and the second tapering.
2. the cold rolling width control method of ferritic stainless steel as claimed in claim 1, it is characterized in that, the steel grade of described ferritic stainless steel is 400 is steel grade, w=1275mm, the first cone is long is 350mm, and the first tapering is 0.875, second cone is long is 390mm, and the second tapering is 0.975.
3. the cold rolling width control method of ferritic stainless steel as claimed in claim 2, it is characterized in that, in the operation of rolling, during even-numbered pass operation, comparatively odd-numbered pass is low for mill speed.
4. the cold rolling width control method of ferritic stainless steel as claimed in claim 2, it is characterized in that, when steel plate rolling width is 1260mm, first intermediate roll stroke is 220mm, and the traversing amount of first intermediate roll is: lap=220/2+390-(948-630)=182mm during first intermediate roll stroke/2+ centre position.
5. the cold rolling width control method of ferritic stainless steel as claimed in claim 2, it is characterized in that, when steel plate rolling width is 1290mm, the traversing amount of first intermediate roll is: lap=220/2+350-(948-645)=157mm during first intermediate roll stroke/2+ centre position.
6. the cold rolling width control method of ferritic stainless steel as claimed in claim 1, it is characterized in that, described tapering end also comprises: therefore ecto-entad is connected to middle cone section and the inner cone section of outer cone section the inner, and the tapering of described middle cone section and inner cone section reduces gradually.
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| JPH08117829A (en) * | 1994-10-18 | 1996-05-14 | Kawasaki Steel Corp | Cold rolling method for steel sheet |
| CN1974036A (en) * | 2005-11-29 | 2007-06-06 | 株式会社日立制作所 | Multiple rolling machine and its control method |
| CN101259485A (en) * | 2008-02-18 | 2008-09-10 | 宁波永正精密不锈钢有限公司 | 20 high mill intermediate roller cone |
| CN201271651Y (en) * | 2008-08-14 | 2009-07-15 | 浙江甬金不锈钢集团有限公司 | Intermediate roll |
| CN101690940A (en) * | 2008-12-25 | 2010-04-07 | 山西太钢不锈钢股份有限公司 | Method for rolling precision stainless steel strips with Sendzimir rolling mill |
| CN201537623U (en) * | 2009-09-21 | 2010-08-04 | 安徽鑫科新材料股份有限公司 | Tower-shaped roll system structure of multi-roll mill |
| CN102151700A (en) * | 2010-12-01 | 2011-08-17 | 山西太钢不锈钢股份有限公司 | Method for improving cold rolling straightness of cold-rolled strip steel |
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2014
- 2014-12-08 CN CN201410743685.9A patent/CN104492821B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08117829A (en) * | 1994-10-18 | 1996-05-14 | Kawasaki Steel Corp | Cold rolling method for steel sheet |
| CN1974036A (en) * | 2005-11-29 | 2007-06-06 | 株式会社日立制作所 | Multiple rolling machine and its control method |
| CN101259485A (en) * | 2008-02-18 | 2008-09-10 | 宁波永正精密不锈钢有限公司 | 20 high mill intermediate roller cone |
| CN201271651Y (en) * | 2008-08-14 | 2009-07-15 | 浙江甬金不锈钢集团有限公司 | Intermediate roll |
| CN101690940A (en) * | 2008-12-25 | 2010-04-07 | 山西太钢不锈钢股份有限公司 | Method for rolling precision stainless steel strips with Sendzimir rolling mill |
| CN201537623U (en) * | 2009-09-21 | 2010-08-04 | 安徽鑫科新材料股份有限公司 | Tower-shaped roll system structure of multi-roll mill |
| CN102151700A (en) * | 2010-12-01 | 2011-08-17 | 山西太钢不锈钢股份有限公司 | Method for improving cold rolling straightness of cold-rolled strip steel |
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Address after: 215625 Yangtze River Metallurgical Industrial Park, Zhangjiagang City, Jiangsu Province Patentee after: Puxiang (Zhangjiagang) Stainless Steel Co., Ltd. Address before: 215625 Yangtze River Metallurgical Industrial Park, Zhangjiagang City, Jiangsu Province Patentee before: Puxiang Stainless Steel Co Ltd, Shangjiagang |
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