CN111451292A - Method for controlling transverse thickness precision of 1000 MPa-grade cold-rolled dual-phase steel - Google Patents
Method for controlling transverse thickness precision of 1000 MPa-grade cold-rolled dual-phase steel Download PDFInfo
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- CN111451292A CN111451292A CN202010241743.3A CN202010241743A CN111451292A CN 111451292 A CN111451292 A CN 111451292A CN 202010241743 A CN202010241743 A CN 202010241743A CN 111451292 A CN111451292 A CN 111451292A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 229910000885 Dual-phase steel Inorganic materials 0.000 title claims abstract description 24
- 238000005096 rolling process Methods 0.000 claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 238000005097 cold rolling Methods 0.000 claims abstract description 22
- 238000013000 roll bending Methods 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000005098 hot rolling Methods 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 238000009966 trimming Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000013072 incoming material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
Classifications
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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
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a method for controlling the transverse thickness precision of 1000 MPa-grade cold-rolled dual-phase steel, which comprises the following steps of controlling the cross section of a hot-rolled raw material: the convexity of the raw material is controlled to be 40-60um, and the convexity of the wedge is controlled to be within 40 um; the cold rolling reduction ratio is controlled to be 40-60 percent; the roll bending rolling force of the cold continuous rolling 1# -N # working roll is set as follows: 0.5-0.6MN, 2# - (N-1) #: 0.6-0.7MN, N #: 0.7-0.8 MN; the roll bending rolling force of the 1-N # intermediate roll is set as follows: 0.1-0.2MN, 2# - (N-1) #: 0.2-0.3MN, N #: 0.3-0.4 MN; the distance between the position of the middle roller and the edge of the strip steel is 10-20 mm. The method is simple and feasible by combining the actual production condition of the cold rolling unit, and can realize the accurate control of the transverse thickness precision of the 1000 MPa-level cold-rolled dual-phase steel.
Description
Technical Field
The invention relates to a method for controlling the transverse thickness precision of cold-rolled high-strength steel, in particular to a method for controlling the transverse thickness precision of 1000 MPa-level cold-rolled dual-phase steel.
Background
At present, with the acceleration of the lightweight process of automobiles, the demand on 1000MPa cold-rolled dual-phase steel products is increasing day by day, and the requirement on the transverse thickness precision of high-strength steel is higher and reaches within +/-0.06 mm, and the requirement of users on the full-plate-width high-thickness precision can be met only by means of large trimming amount, head and tail cutting, central thickness setting improvement and the like, but the yield of the products is obviously reduced.
The prior published patent document CN201510232762.9, the determination method of the transverse thickness difference of the cold-rolled strip steel, discloses a determination method of the transverse thickness difference of the cold-rolled strip steel, and solves the technical problem of inaccurate transverse thickness difference obtained by the prior technical scheme, the scheme is applied to a cold-rolled silicon steel unit to obtain the rolling width, the target width and the strip steel thickness of the cold-rolled strip steel to be detected, and the rolling width and the target width are used for calculating the single-side trimming magnitude of the cold-rolled strip steel to be detected; judging the nth range interval of the single-side trimming quantity value in the single-side trimming quantity range standard so as to determine the nth judgment basis corresponding to the nth range interval used by the cold-rolled strip steel to be detected; determining a corresponding transverse thickness difference detection value of the cold-rolled strip steel to be detected according to the nth judgment basis; and judging the grading range of the lateral thickness difference detection value in the lateral thickness difference standard so as to determine the first thickness difference grade of the cold-rolled strip steel to be detected, thereby realizing the overall obtaining of the lateral thickness difference level on the whole roll of strip steel.
The patent publication CN200910196646.0, a cold-rolled strip steel lateral thickness difference control method, discloses a cold-rolled strip steel lateral thickness difference control method, which is based on a section instrument configured at the inlet of a No. 1 frame to detect the shape of the section of a hot-rolled incoming material in real time and realize the feed-forward control of the strip steel lateral thickness difference; the method mainly comprises the following steps: (1) a strip steel section shape detector is arranged at the inlet of a No. 1 frame of a cold rolling mill, and the section shape of a hot rolling incoming material is detected in real time; (2) calculating the section characteristic value vector of the strip steel at the inlet of the No. 1 frame by the measured value of the section shape of the hot-rolled incoming material; (3) respectively determining the compensation quantity of a working roll bending roll, a middle roll bending roll, a supporting roll tilting roll, an upper middle roll shifting roll and a lower middle roll shifting roll of the machine frame according to the deviation between the actual value of the characteristic vector of the strip steel section at the inlet of the machine frame No. 1 and the target value of the characteristic vector; (4) and when the lateral thickness difference control output is carried out, the actual distribution of the flatness of the roll gap outlet is taken as a constraint condition. The quality of the cold-rolled finished strip steel can be further improved, and the stability of the cold-rolling production process is ensured.
The disclosed technology is carried out from the perspective of program control, the process is complex and abstract, the theory is feasible, but the actual application effect is limited by the actual production condition and the process structure characteristics of the cold continuous rolling unit of each steel mill.
At present, the transverse thickness precision control of the 1000 MPa-grade cold-rolled dual-phase steel is not realized by a rolling process control means such as controlling the shape of the cross section of a hot-rolled raw material, the process parameters of a cold continuous rolling unit and the like in the prior art.
Disclosure of Invention
The invention aims to provide a method for controlling the transverse thickness precision of 1000MPa grade cold-rolled dual-phase steel, which comprises the steps of hot-rolled cross section shape control, compression ratio control, process parameter control of a cold tandem mill set and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
the method for controlling the transverse thickness precision of the 1000 MPa-grade cold-rolled dual-phase steel comprises the following steps of:
1) controlling the cross section of the hot rolling raw material: controlling the convexity of a hot rolling raw material of 1000MPa cold-rolled dual-phase steel to be 40-60um, and controlling the convexity of a wedge to be within 40 um;
2) and (3) controlling the cold rolling reduction ratio: controlling the rolling reduction ratio of the cold-rolled dual-phase steel of 1000MPa to be 40-60%;
3) setting the roll bending force of each working roll of the cold continuous rolling unit: the roll bending rolling force of the cold continuous rolling 1# -N # working roll is set as follows: 0.5-0.6MN, 2# - (N-1) #: 0.6-0.7MN, N #: 0.7-0.8 MN;
4) setting the roll bending force of the middle roll of each frame of the cold continuous rolling unit: the roll bending rolling force of the 1-N # intermediate roll is set as follows: 0.1-0.2MN, 2# - (N-1) #: 0.2-0.3MN, N #: 0.3-0.4 MN;
5) and (3) controlling the roll shifting of the middle roll of each frame of the cold continuous rolling unit: the distance between the position of the middle roller and the edge of the strip steel is 10-20mm, so that the metal flow at the edge is reduced.
N≥5。
Compared with the prior art, the invention has the beneficial effects that:
a method for controlling the transverse thickness precision of 1000MPa grade cold-rolled dual-phase steel comprises the steps of controlling the shape of a hot-rolled cross section, controlling a compression ratio, controlling technological parameters of a cold tandem mill set and the like, the method is simple and easy to implement by combining the actual production condition of the cold rolling mill set, the precise control of the transverse thickness precision of the 1000MPa grade cold-rolled dual-phase steel can be realized, and before the method is used, the transverse thickness difference of the 1000MPa grade cold-rolled dual-phase steel of the production unit is within +/-0.1 mm; after the method is used, the transverse thickness difference of the 1000MPa grade cold-rolled dual-phase steel is within +/-0.06 mm.
Detailed Description
The following further illustrates embodiments of the invention:
the transverse thickness precision of the cold-rolled strip depends on the shape of the section of a hot-rolled incoming strip and the reduction of the strip edge in the cold-rolling process, wherein the reduction of the strip edge in the cold-rolling process is caused by the elastic flattening of the working rolls of the rolling mill and the transverse metal flow in the strip edge area. In the cold rolling process, the 1000MPa grade cold rolling dual-phase steel has serious work hardening, larger deformation resistance and prominent flattening problem, thus leading to large transverse thickness difference after rolling. Therefore, the invention comprehensively considers the control of the hot rolling section shape, the compression ratio and the cold rolling process, ensures the transverse thickness precision of the 1000MPa cold-rolled dual-phase steel, and provides a method for controlling the transverse thickness precision of the 1000MPa grade cold-rolled dual-phase steel, which comprises the following steps:
1) controlling the cross section of the hot rolling raw material: generally, when the strip steel is kept straight, the larger the convexity and wedge of the hot rolling raw material is, the larger the transverse thickness difference after the corresponding cold rolling is. Therefore, the adoption of the hot rolling raw material with smaller convexity and wedge shape is beneficial to obtaining smaller transverse thickness difference. However, the smaller crown and wedge target increases the difficulty of controlling the shape of the hot rolled strip, resulting in unstable hot rolling production and difficult shape quality. Comprehensively considering the transverse thickness difference control after cold rolling and the stability of hot rolling production and good control conditions of plate shape, controlling the convexity of a hot rolling raw material of 1000MPa cold rolling dual-phase steel to be 40-60um, and controlling the convexity of a wedge to be within 40 um;
2) and (3) controlling the cold rolling reduction ratio: the thickness of the hot rolling raw material is improved, the compression ratio is increased, the influence caused by poor hot rolling section shape can be reduced, but the large compression ratio can cause the difficulty of cold rolling and the increase of roller flattening, the transverse thickness difference and the stability of cold rolling are comprehensively considered, and the compression ratio of the cold rolling of the 1000MPa cold rolling dual-phase steel is controlled to be 40-60 percent;
3) setting the bending force of each frame of working roll of the cold continuous rolling unit: under a certain condition of rolling force, along with the increase of the bending roll of the working roll, the roll gap flattening is reduced, the edge drop can be effectively reduced, but the regulation and control effect on the secondary convexity is gradually reduced, and the shape defect is easily caused, so the bending roll force of the cold continuous rolling 1# -N # working roll is set according to the following conditions by comprehensively considering the cold rolling shape control and the transverse thickness difference after the cold rolling: 0.5-0.6MN, 2# - (N-1) #: 0.6-0.7MN, N #: 0.7-0.8 MN;
4) setting the bending force of each frame of intermediate rolls of the cold continuous rolling unit: under the certain condition of rolling force, along with the increase of the middle roll bending roll, the roll gap is flattened and reduced, the effective convexity of the middle roll is changed, the transverse extension distribution of the rolled band steel is improved, the transverse thickness difference is favorably controlled, the regulation and control effects on the four-time convexity are gradually reduced, the contact pressure between the rolls is also increased and uneven, the shape of the plate is poor, and therefore the 1-N # middle roll bending force is set as follows: 0.1-0.2MN, 2# - (N-1) #: 0.2-0.3MN, N #: 0.3-0.4 MN;
5) and (3) controlling the roll shifting of the middle roll of each frame of the cold continuous rolling unit: along with the increase of the distance between the roll shifting position of the middle roll and the edge of the strip steel, the harmful contact area between the rolls is increased, the transverse rigidity of the roll gap is gradually reduced, and the metal flow at the edge is increased. Therefore, the smaller the position of the intermediate roll shifting amount is from the edge of the strip steel, the better the position is, the contact pressure peak value between the rolls is reduced, the rolling stability is ensured, and the position of the intermediate roll shifting amount is 10-20mm from the edge of the strip steel, so that the metal flow at the edge is reduced.
Examples are shown in Table 1:
table 1 examples 1-4
Claims (2)
1. The method for controlling the transverse thickness precision of the 1000 MPa-grade cold-rolled dual-phase steel is characterized by comprising the following steps of:
1) controlling the cross section of the hot rolling raw material: controlling the convexity of a hot rolling raw material of 1000MPa cold-rolled dual-phase steel to be 40-60um, and controlling the convexity of a wedge to be within 40 um;
2) and (3) controlling the cold rolling reduction ratio: controlling the rolling reduction ratio of the cold-rolled dual-phase steel of 1000MPa to be 40-60%;
3) setting the roll bending force of each working roll of the cold continuous rolling unit: the roll bending force of the cold continuous rolling 1# -N # working roll is set as follows: 0.5-0.6MN, 2# - (N-1) #: 0.6-0.7MN, N #: 0.7-0.8 MN;
4) setting the roll bending force of the middle roll of each frame of the cold continuous rolling unit: the 1-N # intermediate roll bending force is set as follows: 0.1-0.2MN, 2# - (N-1) #: 0.2-0.3MN, N #: 0.3-0.4 MN;
5) and (3) controlling the roll shifting of the middle roll of each frame of the cold continuous rolling unit: the distance between the position of the middle roller and the edge of the strip steel is 10-20mm, so that the metal flow at the edge is reduced.
2. The method for controlling the transverse thickness precision of 1000MPa grade cold rolled dual phase steel according to claim 1, wherein N is not less than 5.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115055522A (en) * | 2022-07-01 | 2022-09-16 | 北京科技大学 | Control method and system for wedge shape of rack outlet of finishing mill group |
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Application publication date: 20200728 |