CN102632086A - Method for controlling side waves of hot rolling strip steel - Google Patents

Method for controlling side waves of hot rolling strip steel Download PDF

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Publication number
CN102632086A
CN102632086A CN2012100486877A CN201210048687A CN102632086A CN 102632086 A CN102632086 A CN 102632086A CN 2012100486877 A CN2012100486877 A CN 2012100486877A CN 201210048687 A CN201210048687 A CN 201210048687A CN 102632086 A CN102632086 A CN 102632086A
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roll
hot
working roll
side wave
shape
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CN102632086B (en
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张国民
焦四海
王全胜
陈龙夫
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Abstract

The invention relates to a method for controlling side waves of hot rolling strip steel, which is realized by means of correcting a grinding roll-shaped curve of a working roll of a hot rolling mill. The method is characterized by comprising following steps: (S), determining the region of the side waves of the hot rolling strip steel; (S2) determining the correction amount of the shape of the working roll; (S3) correcting the grinding roll-shaped curve of the working roll; and (S4) grinding the working roll according to the corrected working roll grinding roll-shaped curve obtained from the step (S3), obtaining the shape of the corrected working roll, and accordingly controlling the side waves of the hot rolling strip steel. The method overcomes the shortcoming of side waves of strip steel products by means of improving the initial shape of the working roll of the hot rolling mill, and increases the quality of straightness of the strip steel products.

Description

A kind of hot-strip side wave control method
Technical field
The invention belongs to the hot-strip production technical field, particularly, relate to a kind of hot-strip side wave control method, be applicable to the flatness control of hot-strip product.
Background technology
Glacing flatness is an important quality index of hot-strip product.So-called glacing flatness (claiming flatness again) is be consistent with the horizontal plane measurement index of degree of steel plate.Usually weigh with the unevenness index, it be meant surface of steel plate and horizontal plane the maximum deviation distance.The wave or the wooden dipper that are meant the band steel in appearance are bent.Common flatness defects comprised middle wave, bilateral wave, monolateral wave, side wave (claiming rib wave or 1/4 wave again) and camber etc. during hot rolling was produced.
In order effectively to control the hot-strip glacing flatness; Since the seventies in 20th century; People are carrying out a large amount of research aspect plate shape basic theory and the control technology; Developed many plate shape equipment, technology, Detection & Controling technology, obtained remarkable result, many technology have also got into the commercial Application stage.
Basically all disposed complete plat control system on the modern hot strip rolling mill, like hydraulic bending roll, roll shifting, intersection roller, online grinding roller technology etc.Because wave and bilateral wave during the flatness defect in the hot-strip production shows as usually, therefore existing hot-rolling mill plate shape control device also mainly is to middle wave and bilateral wave, considers not enough for the high order shape wave of side wave etc.But under some special producing conditions, like stainless steel hot-rolling, because rolling temperature is high, thermal expansion of rollers is bigger with wearing and tearing, and roll gap shape is complicated, the complicated shape wave of side wave (as shown in Figure 1) etc. may occur.The unrestrained defective of side uses (as cold rolling) totally unfavorable for rolling stability or following process, and side wave defective uses (as cold rolling) totally unfavorable for hot rolling stability or following process, causes problems such as rolling brokenly, batch contusion, surface wiping scuffing easily.
In order to control the complicated shape wave in the production of band steel, (patent families EP1118395, FR2803548 DE60111875T) disclose a kind of milling train hot-rolling shape control method to patent US20010007200A1.Promptly control along body of roll direction distributed nozzle flow and pressure, dynamically adjust the thermal expansion curve of roll in the operation of rolling, thereby the shape wave of strip width direction diverse location is controlled through segmentation.This method is widely used in cold rolled strip steel production, the meticulous cooling technology of promptly so-called roll segmentation.In hot rolling is produced, application is not arranged.
Summary of the invention
For solving the problem of above-mentioned existence, the object of the present invention is to provide a kind of hot-strip side wave control method, through improving the initial roll forming of operation roll of mill,, improve belt steel product glacing flatness quality to improve the side wave defective of belt steel product.
For achieving the above object, the present invention adopts following technical scheme:
A kind of hot-strip side wave control method, said method is characterized in that through hot-rolling mill working roll grinding roll shape curve is revised realization, comprises the steps:
(S1), confirm said hot-strip side wave zone
The zone of confirming the side wave is the said hot-strip of distance center x 1To x 2Scope in, said x 1Scope be 100～200mm, said x 2Scope be 400～600mm;
(S2), the shape of working roll correction confirms
Size according to the definite hot-strip side wave zone of step (S1) obtains shape of working roll maximum modified amount c through trial and error method or off-line simulation analysis tool x
(S3), the correction of working roll grinding roll shape curve
The hot-strip side wave zone definite, i.e. [x to step (S1) 1, x 2] corresponding shape of working roll revises through sinusoidal form
The initial grinding roll shape curve of working roll is:
y = c × sin [ π 2 ( L - x L ) ] , 0 ≤ x ≤ x 1 , x 2 ≤ x ≤ L / 2 - - - ( 1 )
Working roll grinding roll forming local correction curve is:
y c = A · { sin [ 1 - 3 B ( 2 x - C ) ] · π 2 - 2 2 } - - - ( 2 )
So revised working roll grinding roll shape curve is:
y = c × sin [ π 2 ( L - x L ) ] - y c , x 1 ≤ x ≤ x 2 - - - ( 3 )
L is long for the working roll body of roll in the following formula, the mm of unit, c xBe the maximum modified amount of confirming in the step (S2), x is a body of roll centre distance, and c is a work roll crown, in the following formula,
A = 2 c x 2 + 2 - - - ( 4 )
B＝x 2-x 1 (5)
C＝x 1+x 2 (6)
(S4), working roll is carried out grinding, obtain revised shape of working roll, thereby realize control said hot-strip side wave according to the revised working roll grinding roll shape curve that obtains in the step (S3).
According to a kind of hot-strip side wave control method provided by the present invention, employing be that said barrel length L is 900～2300mm.
According to a kind of hot-strip side wave control method provided by the present invention, employing be that said work roll crown c is-0.2～0.2mm.
According to a kind of hot-strip side wave control method provided by the present invention, employing be in the said step (S2), to obtain shape of working roll maximum modified amount c through the off-line simulation analysis tool x
According to a kind of hot-strip side wave control method provided by the present invention, employing be said c xScope be 8～15 μ m.
According to a kind of hot-strip side wave control method provided by the present invention, employing be that said hot-strip side wave scope is 1.6%～2.8%.
According to a kind of hot-strip side wave control method provided by the present invention, employing be in the step (S4), to adopt the CNC Digit Control Machine Tool that shape of working roll is carried out grinding.
The beneficial effect of a kind of hot-strip side wave control method provided by the present invention is: through the initial grinding roll shape curve of working roll is carried out local correction; And then shape of working roll revised; Thereby improved the side wave defective of belt steel product, improved belt steel product glacing flatness quality.
Description of drawings
Fig. 1 is a hot-strip side wave sketch map.
Fig. 2 is the operation roll of mill structural representation.
Fig. 3 is a working roll grinding roll shape curve sketch map.
Fig. 4 is a hot-strip side wave area schematic.
Fig. 5 is an original working roll grinding roll shape curve and correction back working roll grinding roll shape curve contrast sketch map among the embodiment one.
Fig. 6 is an original working roll grinding roll shape curve and correction back working roll grinding roll shape curve contrast sketch map among the embodiment two.
Fig. 7 is an original working roll grinding roll shape curve and correction back working roll grinding roll shape curve contrast sketch map among the embodiment three.
Among Fig. 4, S representes the width of hot-strip.
The specific embodiment
Below in conjunction with accompanying drawing a kind of hot-strip side wave control method provided by the present invention is further explained.
Roll (being working roll) is the vitals (as shown in Figure 2) of rolling mill for hot rolled planks and strips.In the operation of rolling, roller surface can produce wearing and tearing.For plate shape (comprising convexity and glacing flatness) and the surface quality that guarantees belt steel product, behind rolling certain milimeter number, roll need unload and utilize grinding machine grinding again.Because expanded by heating in rolling, roll can produce certain thermal expansion roll forming.For the effectively convexity and the glacing flatness of control belt steel product, usually the body of roll is ground to certain roll forming during grinding, to compensate the thermal expansion in rolling.The roll shape curve that the hot-rolling mill working roll is commonly used is mainly second-degree parabola and sine curve.Shown in Figure 3 is the initial grinding roll shape curve of a sinusoidal working roll; Wherein the long L of the working roll body of roll is 900～2300mm; Working roll roll crown c is-0.2～0.2mm; Confirming of barrel length and work roll crown scope all confirmed according to width, length and the gauge of hot-strip here.
The roll grinder that adopts among the present invention is advanced CNC Digit Control Machine Tool, has precision, reliable, stable characteristics, can carry out Precise Grinding according to the roll shape curve that operating personnel set, and technology acuracy can reach micron order.
The concrete steps of a kind of hot-strip side wave control method provided by the present invention are following:
(S1), confirm said hot-strip side wave zone
As shown in Figure 4, hot-strip side wave is between strip edge portion and center in certain zone.According to online or offline inspection result, can confirm side wave position, confirm that the zone of side wave is the said hot-strip of distance center x 1To x 2Scope in, said x 1Scope be 100～200mm, said x 2Scope be 400～600mm.Confirming of the scope of x1 and x2 confirmed according to width, length and the gauge of hot-strip here.
Wherein, the unrestrained area relative working roll of said hot-strip side body of roll position is and need carries out improved zone to shape of working roll.
(S2), the shape of working roll correction confirms
Size according to the definite hot-strip side wave zone of step (S1) obtains shape of working roll maximum modified amount c through trial and error method or off-line simulation analysis tool x
In order to control the side wave, need carry out local correction to the shape of working roll of relevant position.Roll forming maximum modified amount c xConfirm to consider in a rolling cycle, can adapt to the needs of all production board shapes controls, can improve the side wave defective of portioned product after promptly revising, be unlikely to again to bring plate shape problem to other products.
In order rationally to confirm correction, method is to obtain through trial and error repeatedly.This method shortcoming is the correction that needs in order to obtain, and needs test of many times, and the time is longer.
Another is to utilize the off-line simulation analysis tool to calculate.Aspect the board rolling simulation, some ripe practical methods are arranged, cut apart beam model or beam on elastic foundation model analysis roll elastic deformation like employing, adopt energy method or analysis of finite element method rolled piece metal plastic deformation.
(S3), the correction of working roll grinding roll shape curve
The hot-strip side wave zone definite, i.e. [x to step (S1) 1, x 2] corresponding shape of working roll revises through sinusoidal form,
The initial grinding roll shape curve of working roll is:
y = c × sin [ π 2 ( L - x L ) ] , 0 ≤ x ≤ x 1 , x 2 ≤ x ≤ L / 2 - - - ( 1 )
Working roll grinding roll forming local correction curve is:
y c = A · { sin [ 1 - 3 B ( 2 x - C ) ] · π 2 - 2 2 } - - - ( 2 )
So revised working roll grinding roll shape curve is:
y = c × sin [ π 2 ( L - x L ) ] - y c , x 1 ≤ x ≤ x 2 - - - ( 3 )
L is long for the working roll body of roll in the following formula, the mm of unit, c xBe the maximum modified amount of confirming in the step (S2), x is a body of roll centre distance, and c is a work roll crown, in the following formula,
A = 2 c x 2 + 2 - - - ( 4 )
B＝x 2-x 1 (5)
C＝x 1+x 2 (6)
(S4), working roll is carried out grinding, obtain revised shape of working roll, thereby realize control said hot-strip side wave according to the revised working roll grinding roll shape curve that obtains in the step (S3).
Said c xScope be 8～15 μ m.The foundation of confirming this scope is confirmed the maximum modified amount in this scope for according to production practices, can effectively control hot-strip side wave generation of defects.
Wherein, side wave scope is 1.6%～2.8%.Be used to represent side wave shape wave defect size.
Provide the specific embodiment of a kind of hot-strip side wave control method provided by the present invention below.
Embodiment one:
Original working roll grinding roll shape curve is a sine curve, and convexity is-0.1mm that the body of roll is long to be 1780mm.According to the offline inspection result, confirm that side wave position is that distance is with steel center 200mm in the 400mm scope, i.e. x 1Be 200mm, x 2Be 400mm, hot-strip side wave is 1.6% (wave height/wavelength).Adopt the off-line simulation instrument to confirm the required roll forming maximum modified amount c of control side wave xBe 8 μ m.According to formula (1)～(6), draw:
The initial grinding roll shape curve of working roll is:
y = - 0.1 × sin [ π 2 ( 1780 - x 1780 ) ] , 0 ≤ x ≤ 200,400 ≤ x ≤ 890
Working roll grinding roll forming local correction curve is:
y c = 0.004686 · { sin [ 1 - 3 200 ( 2 x - 600 ) ] · π 2 - 0.7071 }
So revised working roll grinding roll shape curve is:
y = - 0.1 × sin [ π 2 ( 1780 - x 1780 ) ] - y c , 200 ≤ x ≤ 400
Shown in Figure 5ly be original working roll grinding roll shape curve and revise the contrast of back working roll grinding roll shape curve.
Adopt the CNC Digit Control Machine Tool that working roll is carried out grinding according to revised working roll grinding roll shape curve, obtain revised shape of working roll, thereby realize control said hot-strip side wave.
Embodiment two:
Original working roll grinding roll shape curve is a sine curve, and work roll crown is 0.1mm, and the body of roll is long to be 2000mm.According to the offline inspection result, confirm that side wave position is that distance is with steel center 100mm in the 500mm scope, i.e. x 1Be 100mm, x 2Be 500mm, hot-strip side wave is 2.2% (wave height/wavelength).Adopt the off-line simulation instrument to confirm the required roll forming maximum modified amount c of control side wave xBe 12 μ m.
According to formula (1)～(6), draw:
The initial grinding roll shape curve of working roll is:
y = 0.1 × sin [ π 2 ( 2000 - x 2000 ) ] , 0 ≤ x ≤ 100,500 ≤ x ≤ 1000
Working roll grinding roll forming local correction curve is:
y c = 0.007029 · { sin [ 1 - 3 400 ( 2 x - 600 ) ] · π 2 - 0.7071 }
So revised working roll grinding roll shape curve is:
y = 0.1 × sin [ π 2 ( 2000 - x 2000 ) ] - y c , 100 ≤ x ≤ 500
Shown in Figure 6ly be original working roll grinding roll shape curve and revise the contrast of back working roll grinding roll shape curve.
Adopt the CNC Digit Control Machine Tool that working roll is carried out grinding according to revised working roll grinding roll shape curve, obtain revised shape of working roll, thereby realize control said hot-strip side wave.
Embodiment three:
Original working roll grinding roll shape curve is a sine curve, and convexity is-0.15m that the body of roll is long to be 1500mm.According to the offline inspection result, confirm that side wave position is that distance is with steel center 200mm in the 600mm scope, i.e. x 1Be 200mm, x 2Be 600mm, the side wave is 2.8% (wave height/wavelength).Adopt the off-line simulation instrument to confirm the required roll forming correction c of control side wave xBe 15 μ m.
According to formula (1)～(6), draw:
The initial grinding roll shape curve of working roll is:
y = - 0.15 × sin [ π 2 ( 1500 - x 1500 ) ] , 0 ≤ x ≤ 200 , 400 ≤ x ≤ 750
Working roll grinding roll forming local correction curve is:
y c = 0.008787 · { sin [ 1 - 3 400 ( 2 x - 800 ) ] · π 2 - 0.7071 }
So revised working roll grinding roll shape curve is:
y = - 0.15 × sin [ π 2 ( 1500 - x 1500 ) ] - y c , 200 ≤ x ≤ 600
Shown in Figure 7ly be original working roll grinding roll shape curve and revise the contrast of back working roll grinding roll shape curve.
Adopt the CNC Digit Control Machine Tool that shape of working roll is carried out grinding according to revised working roll grinding roll shape curve, obtain revised shape of working roll, thereby realize control said hot-strip side wave.

Claims (7)

1. hot-strip side wave control method, said method is characterized in that through hot-rolling mill working roll grinding roll shape curve is revised realization, comprises the steps:
(S1), confirm said hot-strip side wave zone
The zone of confirming the side wave is the said hot-strip of distance center x 1To x 2Scope in, said x 1Scope be 100～200mm, said x 2Scope be 400～600mm;
(S2), the shape of working roll correction confirms
Size according to the definite hot-strip side wave zone of step (S1) obtains shape of working roll maximum modified amount c through trial and error method or off-line simulation analysis tool x
(S3), the correction of working roll grinding roll shape curve
The hot-strip side wave zone definite, i.e. [x to step (S1) 1, x 2] corresponding shape of working roll revises through sinusoidal form
The initial grinding roll shape curve of working roll is:
y = c × sin [ π 2 ( L - x L ) ] , 0 ≤ x ≤ x 1 , x 2 ≤ x ≤ L - - - ( 1 )
Working roll grinding roll forming local correction curve is:
y c = A · { sin [ 1 - 3 B ( 2 x - C ) ] · π 2 - 2 2 } - - - ( 2 )
So revised working roll grinding roll shape curve is:
y = c × sin [ π 2 ( L - x L ) ] - y c , x 1 ≤ x ≤ x 2 - - - ( 3 )
L is long for the working roll body of roll in the following formula, the mm of unit, c xBe the maximum modified amount of confirming in the step (S2), x is a body of roll centre distance, and c is a work roll crown, in the following formula,
A = 2 c x 2 + 2 - - - ( 4 )
B＝x 2-x 1 (5)
C＝x 1+x 2 (6)
(S4), working roll is carried out grinding, obtain revised shape of working roll, thereby realize control said hot-strip side wave according to the revised working roll grinding roll shape curve that obtains in the step (S3).
2. a kind of hot-strip side wave control method according to claim 1, it is characterized in that: said barrel length L is 900～2300mm.
3. a kind of hot-strip side wave control method according to claim 1, it is characterized in that: said work roll crown c is-0.2～0.2mm.
4. a kind of hot-strip side wave control method according to claim 1 is characterized in that: in the said step (S2), obtain shape of working roll maximum modified amount c through the off-line simulation analysis tool x
5. according to claim 1 or 4 described a kind of hot-strip side wave control methods, it is characterized in that: said c xScope be 8～15 μ m.
6. a kind of hot-strip side wave control method according to claim 1 is characterized in that: said hot-strip side wave scope is 1.6%～2.8%.
7. a kind of hot-strip side wave control method according to claim 1 is characterized in that: in the step (S4), adopt the CNC Digit Control Machine Tool that shape of working roll is carried out grinding.
CN201210048687.7A 2012-02-28 2012-02-28 Method for controlling side waves of hot rolling strip steel Active CN102632086B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104259210A (en) * 2014-09-25 2015-01-07 北京科技大学 Strip rolling variable crown roll having local edge wave control capability
CN104707870A (en) * 2015-01-09 2015-06-17 北京科技大学 Hot rolling flattening machine working roll forming design method based on multi-segment roll forming curve fitting
CN104923573B (en) * 2015-05-18 2017-01-04 北京科技大学 A kind of Forecasting Methodology of cold-rolled thin steel strip width waviness form
CN113102507A (en) * 2021-04-01 2021-07-13 北京首钢股份有限公司 Silicon steel rolling system
CN113798928A (en) * 2020-06-16 2021-12-17 上海梅山钢铁股份有限公司 Working roller grinding method for preventing four-roller roughing mill from slipping
CN114147558A (en) * 2021-11-04 2022-03-08 北京科技大学 Method for determining grinding roll shape of strip steel hot continuous rolling working roll

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CN101214501A (en) * 2007-12-27 2008-07-09 武汉钢铁(集团)公司 Working roll consideration to strip steel convexity, edge drop control and abrasion control and using method
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104259210A (en) * 2014-09-25 2015-01-07 北京科技大学 Strip rolling variable crown roll having local edge wave control capability
CN104707870A (en) * 2015-01-09 2015-06-17 北京科技大学 Hot rolling flattening machine working roll forming design method based on multi-segment roll forming curve fitting
CN104707870B (en) * 2015-01-09 2016-08-24 北京科技大学 Hot rolling and leveling machine shape of working roll method for designing based on multistage roll shape curve matching
CN104923573B (en) * 2015-05-18 2017-01-04 北京科技大学 A kind of Forecasting Methodology of cold-rolled thin steel strip width waviness form
CN113798928A (en) * 2020-06-16 2021-12-17 上海梅山钢铁股份有限公司 Working roller grinding method for preventing four-roller roughing mill from slipping
CN113102507A (en) * 2021-04-01 2021-07-13 北京首钢股份有限公司 Silicon steel rolling system
CN114147558A (en) * 2021-11-04 2022-03-08 北京科技大学 Method for determining grinding roll shape of strip steel hot continuous rolling working roll

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