CN111112343A - Secondary cold-rolled plate shape control method of six-roller UCM rolling mill - Google Patents
Secondary cold-rolled plate shape control method of six-roller UCM rolling mill Download PDFInfo
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Abstract
The invention relates to a secondary cold-rolled plate shape control method of a six-roller UCM rolling mill, (1) the roller shapes of one end of an upper middle roller and one end of a lower middle roller of the six-roller UCM rolling mill, which are opposite to the upper middle roller, are optimally designed; (2) determining the axial play of the intermediate roll according to the width information of the strip steel; (3) and controlling the edge waves and the wide and medium waves of the secondary cold-rolled sheet by the matching of the roll shifting amount of the middle roll and the roll bending technology. The invention controls the strip steel plate shape by designing the end roller shape of the middle roller and combining the roller shifting regulation strategy of the middle roller and the roller bending technology, thereby solving the problem of the edge wave and broad-medium wave plate shape defects in the rolling process of the ultrathin strip steel.
Description
Technical Field
The invention relates to the technical field of cold-rolled strip steel plate shape control, in particular to a secondary cold-rolled plate shape control method of a six-roller UCM rolling mill.
Background
The cold-rolled plate strip steel is a main product in the steel industry, the production technical level and the quality precision level of the cold-rolled plate strip steel mark the technical development level of the steel industry of China, and the plate shape quality is an important index for measuring the quality of the cold-rolled plate strip. With the increasingly fierce market competition and the improvement of printing and coating equipment of users, the requirements of users on the shape of the secondary cold-rolled DR material are higher and higher, and how to ensure the shape quality of the extremely thin DR material becomes a key for restricting the further market expansion.
A1220 DCR unit of a certain factory is two UCM rolling mills, and is provided with flat rolls for production, a 1# rack is responsible for rolling, and a 2# rack is responsible for leveling, and at the moment, the two different procedures are different and mainly expressed as follows: the rolling process aspect is as follows: the No. 1 frame plays a role in rolling and bears the main pressing deformation of the strip steel, the No. 2 frame plays a role in leveling, the pressing amount is small, and the rolling force is smaller than that of the No. 1 frame; the DCR unit mainly produces extremely thin DR material products, the thinnest specification of the products reaches 0.1mm, the requirement on the plate shape control precision is high, the strip steel is further thinned through the secondary rolling and pressing process, the material strength is improved, and the DCR unit has wide application in industries such as can making and the like, so that the DCR unit has very wide market prospect. In the actual production process, the unit often has the defects of complex plate shapes, which are mainly represented by edge waves and wide and medium waves, and in the actual production process, although the target curve of the automatic plate shape control system of the 2# rack is set to be in a micro and medium wave mode, the edge waves of the actual plate shape still exist, so that the aim of obtaining good plate shapes must be achieved by reasonably adjusting process parameters.
Disclosure of Invention
The invention aims to provide a secondary cold-rolled strip shape control method of a six-roller UCM rolling mill, which controls the strip steel strip shape by designing the end roller shape of a middle roller and combining a roller shifting regulation strategy and a roller bending technology of the middle roller so as to solve the problem of the defects of edge waves and broad-medium wave shapes in the rolling process of ultrathin strip steel.
In order to achieve the purpose, the scheme of the invention is as follows: a secondary cold-rolled plate shape control method of a six-roller UCM rolling mill is characterized by comprising the following steps:
(1) the method comprises the following steps of optimally designing end roll shapes of one end of an upper middle roll and one end, opposite to the upper middle roll, of a six-roll UCM rolling mill, wherein roll shape curves of the end roll shapes are as follows:
f(x)＝a0+a2x2+a4x4+a6x6(0≤x≤1)
in the formula: x is the normalized end roller shape length; a is1，a2，a3Is a polynomial coefficient, f (x) is an end roll profile value of the intermediate roll;
(2) determining the axial play of the intermediate roll according to the width information of the strip steel;
(3) and controlling the edge waves and the wide and medium waves of the secondary cold-rolled sheet by the matching of the roll shifting amount of the middle roll and the roll bending technology.
Further, in the step (1), the method for optimally designing the end roller shape comprises the following steps:
(1) determining a roller shape design principle according to problems existing in actual production;
(2) determining a target function and a constraint condition of an end roller profile curve according to the roller profile design principle in the step (1);
(3) and optimizing and calculating the roll form coefficient according to the objective function and the constraint condition to obtain the optimal value of the roll form coefficient, and outputting an optimized roll form curve.
Further, in the step (2) in the step (1), the axial play amount of the intermediate roller is as follows:
S＝B/2-300+δ
wherein S is the axial play of the intermediate roll; delta is a corrected value of the intermediate roll shifting position, namely the relative roll shifting amount; b is the width of the strip steel in mm.
Further, the objective function in step (1) is:
wherein n is the number of different strip steel widths in incoming materials;
di-the ratio of the number of strip coils of the ith strip width to the total number of strip coils;
β (i) is the contact pressure distribution unevenness between rolls at the ith strip width;
Kq(i) the transverse rigidity of a roll gap under the width of the ith strip steel is kN/mm/mum;
KBF2(i) the secondary regulation and control effect of the bending roll force under the ith strip steel width is micron/kN;
w1，w2，w3are weighting coefficients.
Further, in step (1), the constraint conditions are:
wherein, CBURThe convexity of the supporting roller;
CWfor working roll crown；
And L is the width range of the roller-shaped curve.
Further, in the step (1), the roller shape of the end part of the transmission side of the upper intermediate roller and the roller shape of the end part of the working side of the lower intermediate roller are optimally designed.
Further, in the step (1), the roller shape of the end part of the working side of the upper intermediate roller and the roller shape of the end part of the transmission side of the lower intermediate roller are optimally designed.
The invention achieves the following beneficial effects: according to the invention, by setting the intermediate roll profile curve and combining the intermediate roll shifting regulation strategy and the roll bending technology, the rolling condition is effectively improved, the rolling mill profile regulation and control performance is improved, the control on the profile defects of edge waves, wide and medium waves and the like is more facilitated, the profile quality qualification rate of the secondary cold rolling extremely-thin DR material is greatly increased, and the quality of the profile material object is obviously improved.
Drawings
FIG. 1 is a middle roll end profile curve;
fig. 2 is a schematic view of an intermediate roll type arrangement.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
According to the invention, the roll shapes of the end parts of the upper and lower middle rolls are designed, so that the trend of reducing the thickness of the edge part of the strip steel is weakened, the edge waves of the strip steel are effectively controlled, and meanwhile, the roll shifting amount is matched according to the actual condition of the plate shape, and the roll bending technology is matched, and the defects of the plate shape are controlled by the middle roll bending roll and the middle roll bending roll.
As shown in fig. 1, the end roll profiles of the drive side (work side) of the upper intermediate roll and the work side (drive side) of the lower intermediate roll of a six-roll UCM rolling mill are designed such that the upper intermediate roll is shifted from the drive side (work side) to the work side (drive side) in the axial direction thereof and the lower intermediate roll is shifted from the work side (drive side) to the drive side (work side) in the axial direction thereof.
The plate shape control method specifically comprises the following steps:
(1) setting the end roller shape of the 1# frame middle roller
The intermediate roll end roll profile adopts a polynomial curve, and the axially movable intermediate roll end roll profile arranged on the No. 1 frame is as follows:
f(x)＝a0+a2x2+a4x4+a6x6(0≤x≤1)
in the formula: x is the normalized end roller shape length, and the roller shape length is normalized, so that the subsequent iterative calculation optimization of changing the roller shape length is facilitated;
a1，a2，a3is a polynomial coefficient;
and f (x) is an end roll profile value.
The transverse moving position of the middle roller of the six-roller mill is closely related to the width of a rolled piece currently rolled and the curve length of a single-side roller profile, the range of the transverse moving amount S of the middle roller is set to be 0-300 mm, the range of the width B of a rolled strip steel is set to be 700-1050 mm, the length L of the roller profile at the end part is determined to be 150-250 mm, and the maximum f (x) value is determined according to the stability of the mill and the like and ranges from 300-800 mu m.
And obtaining an end roller profile curve by solving the optimal solution of the end roller profile curve of the middle roller.
(2) Control of roll shifting amount of 1# frame intermediate roll
The basic principle of the method is that the contact length between a working roll and a supporting roll is adjusted to be equal to the contact length of a rolled piece, and harmful contact parts between the rolls are eliminated, so that the roll shape adjusting range can be enlarged, the efficiency of a roll bending device is increased, the roll gap shape difference between a No. 1 rack and a No. 2 rack caused by different working procedures is reduced, the proportion convexity difference of a rolling mill is reduced, the strip steel shape control stability is good, and the purpose of remarkably improving the strip steel flatness is achieved.
The strip steel width is kept unchanged in the primary rolling process, the strip steel width B information is obtained from the production information of a rolling mill, when the strip steel width is changed, the actual value S of the intermediate roll shifting of the strip steel shape control of a DCR unit is calculated to adapt to the change of the strip steel width, the purpose of controlling the strip shape defects of the strip steel with different widths can be achieved, and the specific calculation process of the actual value S of the intermediate roll shifting is as follows:
S＝B/2-300+δ
wherein delta is a corrected value of the intermediate roll shifting position, namely a relative roll shifting amount, and the set range is 10-80 mm; b is the width of the strip steel in mm.
In production application, the relative roll shifting amount delta of the intermediate roll is firstly determined, and then the absolute roll shifting amount S of the intermediate roll is calculated according to the formula. FIG. 2 is a schematic diagram showing the arrangement of the roll shapes of the intermediate rolls, wherein the relative roll shifting quantity delta is 0 when the position 70mm away from the end part of the intermediate roll is aligned with the edge of the strip steel; the 70mm position of the middle roller edge part enters the strip steel, and the relative roller shifting amount is negative; when the edge part of the middle roll extends out of the edge of the strip steel by 70mm, the relative roll shifting quantity delta is positive.
According to the invention, the roll shapes of the end parts of the upper and lower middle rolls are designed, so that the trend of reducing the thickness of the edge part of the strip steel is weakened, the edge waves of the strip steel are effectively controlled, and meanwhile, the roll shifting amount is matched according to the actual condition of the plate shape, and the roll bending technology is matched, and the defects of the plate shape are controlled by the middle roll bending roll and the middle roll bending roll.
The solving process of the intermediate roll end roll shape by adopting a polynomial curve is as follows:
the determination of the roll profile curves at the ends of the upper and lower intermediate rolls is mainly to determine the coefficient a0～a6The steps of determining the coefficients, i.e. determining the optimized roll profile, are as follows:
1) roll profile curve design principle:
① it can improve the problems of side waves and broad waves of machine set and improve the quality of plate shape.
② when the new roller shape improves the plate shape quality, it ensures the contact pressure peak value between the rollers and the contact stress non-uniformity between the rollers are lower, and does not reduce the adjusting efficiency of the roller bending force.
2) Determining an objective function and constraints
The width specifications of the incoming strip steel on the production site are various, and the control method of the invention ensures that the designed roll shape can give consideration to the strip steel shape control under various strip steel widths as much as possible; in each rolling process, the width of the strip steel is constant, different strip steel widths correspond to different rolling working conditions, and the number of strip steel rolls in the same strip steel width is large.
The objective function is as follows:
in the formula: n is the number of different strip widths in the incoming material;
di-the ratio of the number of strip coils of the ith strip width to the total number of strip coils;
β (i) -unevenness in contact pressure distribution between rolls at the ith strip width;
Kq(i) -transverse roll gap stiffness at the ith strip width, kN/mm/μm;
KBF2(i) the secondary regulation and control effect of the bending roll force under the width of the ith strip steel is micron/kN;
w1，w2，w3are weighting coefficients.
The constraints are as follows:
CBURfor supporting the roller crown, CWThe roll crown is the work roll crown and L is the roll profile curve width range. To ensure a smooth and monotonic increase in the roll profile, the second derivative f "(x) of f (x) is required>0。
3) Determining roll profile curve parameters:
and searching a roller type curve meeting the conditions through the constraint conditions and the objective function. Coefficient of roll form aiThe method is obtained by finite element software calculation, and comprises the following specific steps:
①, the design variable of the optimization calculation is the roller type coefficient aiThe optimized and calculated objective function and the constraint condition are that the roll gap transverse rigidity is maximum; the contact pressure distribution between the rollers is most uniform; the roller bending control effect of the intermediate roller is strongest; the second reciprocal value of the end roll profile f (x) is greater than zero, i.e., f' (x)>0; the length L of the roller is between 150mm and 250 mm; f (x) the maximum value ranges from 300um to 800 um.
② in the optimization calculation iteration, different roll shape curves are obtained by changing the values of the curve variables, the secondary regulation and control effects of the roll gap lateral rigidity and the roll bending force of the rolling mill under the current roll shape curve and the contact pressure unevenness between the rolls are calculated by using a finite element model, then each roll shape curve is evaluated by using an objective function, and the optimal value is found out from the evaluation results, so that the optimized roll shape curve is output.
The roll profile length L was determined to be 200mm and the maximum roll diameter difference was determined to be 500. mu.m.
Polynomial expression of a roller profile curve:
f(x)＝137.3333x2+362.6667x6(0≤x≤1)
in the formula: x is the normalized end roller shape length; and f (x) is the end roll shape value, μm. The roll profile is shown in figure 1.
Example 1
In a 1220DCR unit of a certain factory, industrial tests are carried out, 15 rolls of strip steel with the steel grade of MR DR-8CA, the width B of 934mm and the thickness H of 0.200mm are continuously produced by adopting a small roll production mode, in the production process, a 1# machine frame delta is set to be 25mm, a 2# machine frame delta is set to be 10mm, and the absolute roll shifting amount of a middle roll is determined to be 192mm of a 1# machine frame S and 177mm of a 2# machine frame S according to the formula (1).
Example 2
In a 1220DCR unit of a certain factory, industrial tests are carried out, 12 rolls of strip steel with the steel grade of TH580, the width of 893mm and the thickness of H of 0.201mm are continuously produced by adopting a small roll production mode, in the production process, a 1# machine frame delta is set to be 25mm, a 2# machine frame delta is set to be 10mm, and the absolute roll shifting amount of a middle roll is determined to be 171.5mm according to the formula (1), and the absolute roll shifting amount of the 2# machine frame S is determined to be 156.5 mm.
By adopting the plate shape control method and the device, the secondary cold rolling unit is provided with a unilateral middle roller profile curve through the middle roller, and the roll shifting regulation strategy of the middle roller and the working roller and middle roller bending technology are combined, so that the rolling condition is effectively improved, the plate shape regulation and control performance of the rolling mill is improved, the control on the plate shape defects such as edge waves, wide waves and the like is more facilitated, the plate shape quality qualification rate of the secondary cold rolling extremely-thin DR material is greatly increased, and the quality of the plate shape object is obviously improved.
Claims (7)
1. A secondary cold-rolled plate shape control method of a six-roller UCM rolling mill is characterized by comprising the following steps:
(1) the method comprises the following steps of optimally designing end roll shapes of one end of an upper middle roll and one end, opposite to the upper middle roll, of a six-roll UCM rolling mill, wherein roll shape curves of the end roll shapes are as follows:
f(x)＝a0+a2x2+a4x4+a6x6(0≤x≤1)
in the formula: x is the normalized end roller shape length; a is1，a2，a3Is a polynomial coefficient, f (x) is an end roll profile value of the intermediate roll;
(2) determining the axial play of the intermediate roll according to the width information of the strip steel;
(3) and controlling the edge waves and the wide and medium waves of the secondary cold-rolled sheet by the matching of the roll shifting amount of the middle roll and the roll bending technology.
2. The strip shape control method according to claim 1, wherein in the step (1), the end roll shape is optimally designed by:
(1) determining a roller shape design principle according to problems existing in actual production;
(2) determining a target function and a constraint condition of an end roller profile curve according to the roller profile design principle in the step (1);
(3) and optimizing and calculating the roll form coefficient according to the objective function and the constraint condition to obtain the optimal value of the roll form coefficient, and outputting an optimized roll form curve.
3. A panel shape control method according to claim 1, wherein in the step (2), the amount of play of the intermediate roll in the axial direction is:
S＝B/2-300+δ
wherein S is the axial play of the intermediate roll; delta is a corrected value of the intermediate roll shifting position, namely the relative roll shifting amount; b is the width of the strip steel in mm.
4. A panel shape control method according to claim 2, characterized in that said objective function is:
wherein n is the number of different strip steel widths in incoming materials;
di-the ratio of the number of strip coils of the ith strip width to the total number of strip coils;
β (i) is the contact pressure distribution unevenness between rolls at the ith strip width;
Kq(i) the transverse rigidity of a roll gap under the width of the ith strip steel is kN/mm/mum;
KBF2(i) the secondary regulation and control effect of the bending roll force under the ith strip steel width is micron/kN;
w1，w2，w3are weighting coefficients.
5. The strip shape control method according to claim 2, wherein the constraint condition is:
wherein, CBURThe convexity of the supporting roller;
CWthe convexity of the working roll;
and L is the width range of the roller-shaped curve.
6. A panel shape control method according to claim 1, wherein in the step (1), the roll shape of the end portion of the driving side of the upper intermediate roll and the roll shape of the end portion of the working side of the lower intermediate roll are optimally designed.
7. A panel shape control method according to claim 1, wherein in the step (1), the roll shape of the end roll shape of the working side of the upper intermediate roll and the roll shape of the end roll shape of the driving side of the lower intermediate roll are optimally designed.
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Cited By (2)
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| CN112845615A (en) * | 2020-12-29 | 2021-05-28 | 中铝西南铝板带有限公司 | Method for compensating width of rolled plate shape of aluminum alloy strip |
| CN112974545A (en) * | 2019-12-12 | 2021-06-18 | 上海梅山钢铁股份有限公司 | Method for preventing and controlling S-shaped middle wave defect of extremely-thin T5 material |
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