CN113083910B - Method for controlling deviation and tearing of steel strip by stopping, re-producing and starting 5-stand cold rolling mill - Google Patents
Method for controlling deviation and tearing of steel strip by stopping, re-producing and starting 5-stand cold rolling mill Download PDFInfo
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- CN113083910B CN113083910B CN202110255373.3A CN202110255373A CN113083910B CN 113083910 B CN113083910 B CN 113083910B CN 202110255373 A CN202110255373 A CN 202110255373A CN 113083910 B CN113083910 B CN 113083910B
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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
- B21B37/48—Tension control; Compression control
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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
- B21B37/58—Roll-force control; Roll-gap control
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Abstract
The invention relates to a method for controlling deviation and tearing of a steel belt by stopping, re-producing and starting a 5-stand cold rolling mill, belonging to the technical field of metallurgical plate production methods. The technical scheme of the invention is as follows: (1) grouping and optimizing the cold rolling hardening data range; (2) improving the roughness of the working rolls of the S1 frame and the S2 frame; (3) stopping the machine and opening a roll gap; (4) and (5) starting to adjust the rolling force and the tension during the re-production. The invention has the beneficial effects that: the method ensures that the steel strip is not deviated and torn when the cold rolling mill is started for the repeated production, reduces rolling waste products, reduces the reactive loss of the roller, improves the production efficiency of the rolling mill, saves the cost of the cold rolling process, and creates considerable benefits for enterprises.
Description
Technical Field
The invention relates to a method for controlling deviation and tearing of a steel belt by stopping, reproducing and starting a 5-stand cold rolling mill, belonging to the technical field of production methods of metallurgical plates.
Background
The stop and recovery start of the cold rolling mill is a necessary stage of the rolling process and is a necessary link after the completion of the operation procedures of roll change, accident treatment, planned inspection and stop and the like of the rolling mill. The rolling start of the cold rolling mill is a complex rolling deformation process, and is closely related to factors such as the rolling reduction, the roughness of the roller, the hardness of the roller, the concentration of emulsion, the components of the emulsion, the flow of the emulsion and the like of each rack, so that the steel strip between the racks is easy to deflect and tear in the start process, parking accidents are formed, the labor intensity of workers is increased, the production rhythm of the rolling mill is influenced, the output of the rolling mill is reduced, rolling grinding and rolling waste products are replaced, and the process cost consumption is increased.
Disclosure of Invention
The invention aims to provide a method for controlling steel strip deviation and tearing during stop and reprint starting of a 5-stand cold rolling mill, which ensures that the steel strip deviation and tearing do not occur during the reprint starting of the cold rolling mill, reduces rolling waste products, reduces the reactive loss of the rolls, improves the production efficiency of the rolling mill, saves the cost of a cold rolling process and creates considerable benefits for enterprises by optimizing cold rolling hardening data in groups and adjusting the surface roughness of the rolls, the stop roll gap state and the starting rolling force tension; in the production method, no equipment or auxiliary materials are added during various adjustments, so that the production cost is not increased; the adjustment is convenient and quick, the response can be quick, and the reproduction starting time is reduced; the thickness of the rolled finished product is not particularly limited when the rolling mill is stopped, the application capability is strong, and the problems in the background technology are effectively solved.
The technical scheme of the invention is as follows: a method for controlling steel belt deviation and tearing by stopping, reproducing and starting a 5-stand cold rolling mill comprises the following steps: (1) grouping and optimizing the cold rolling hardening data range; (2) improving the roughness of the working rolls of the S1 frame and the S2 frame; (3) stopping and opening the roll gap; (4) and (5) starting to adjust the rolling force and the tension during the re-production.
In the step (1), the two-stage mathematical model strength data of the cold rolling material hardening are grouped into 5 stages, including 350-370 MPa, 440-490 MPa, 500-560 MPa, 620-650 MPa and 740-800 MPa.
In the step (2), the roughness of the working roll of the S1 frame is improved to 1.0-1.5um, and the roughness of the working roll of the S2 frame is improved to 0.8-1.0 um.
In the step (3), firstly pressing down the S1 rack inlet clamping device; when the thickness of the finished strip steel is more than or equal to 0.8mm, the roll gaps of the S1-S5 frames are kept in a rolling state and are not opened; the thickness of the finished strip steel is less than 0.8mm, roll gaps of an S3 machine frame, an S4 machine frame and an S5 machine frame are opened, and the roll gaps of an S1 machine frame and an S2 machine frame are kept in a rolling state and are not opened.
In the step (4), the inlet tension of the rolling mill is adjusted to 240-260kN, reducing the rolling force of the S1 stand and the S2 stand by 10-15%, reducing the rolling force of the S3 stand and the S4 stand by 15-20%, and setting the S5 to be in a rolling mode; if the thickness of the finished strip steel is less than or equal to 0.4mm, the tension between the S3 stand and the S4 stand is further adjusted to 130-2The tension between the S4 frame and the S5 frame is 140-2。
The invention has the beneficial effects that: by grouping and optimizing cold rolling hardening data, the surface roughness of the roller, the parking roll gap state and the starting rolling force tension are adjusted, the situation that steel strips are deviated and torn when the cold rolling mill is started for repeated production is ensured, rolling waste products are reduced, the reactive loss of the roller is reduced, the production efficiency of the rolling mill is improved, the cold rolling process cost is saved, and considerable benefits are created for enterprises; in the production method, no equipment and auxiliary materials are added for various adjustments, so that the production cost is not increased; the adjustment is convenient and quick, the response can be fast, and the reproduction starting time is reduced; the thickness of the rolled finished product is not particularly limited when the rolling mill is stopped, and the application capability is strong.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the following describes technical solutions of the embodiments of the present invention clearly, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
A method for controlling deviation and tearing of a steel belt by stopping, re-producing and starting a 5-frame cold rolling mill comprises the following steps: (1) grouping and optimizing the cold rolling hardening data range; (2) improving the roughness of the working rolls of the S1 frame and the S2 frame; (3) stopping the machine and opening a roll gap; (4) and (5) starting to adjust the rolling force and the tension during the re-production.
In the step (1), the two-stage mathematical model strength data of the cold rolling material hardening are grouped into 5 stages, including 350-370 MPa, 440-490 MPa, 500-560 MPa, 620-650 MPa and 740-800 MPa.
And (3) in the step (2), the roughness of the working roll of the S1 machine frame is improved to 1.0-1.5um, and the roughness of the working roll of the S2 machine frame is improved to 0.8-1.0 um.
In the step (3), firstly pressing down the S1 rack inlet clamping device; when the thickness of the finished strip steel is more than or equal to 0.8mm, the roll gaps of the S1-S5 frames are kept in a rolling state and are not opened; the thickness of the finished strip steel is less than 0.8mm, roll gaps of an S3 frame, an S4 frame and an S5 frame are opened, and roll gaps of an S1 frame and an S2 frame are kept in a rolling state and are not opened.
In the step (4), the inlet tension of the rolling mill is adjusted to 240-260kN, the rolling force of the S1 stand and the S2 stand is reduced by 10-15%, the rolling force of the S3 stand and the S4 stand is reduced by 15-20%, and S5 is set to be in a rolling mode; if the thickness of the finished strip steel is less than or equal to 0.4mm, the tension between the S3 stand and the S4 stand is further adjusted to 130-140N/mm2The tension between the S4 frame and the S5 frame is 140-150N/mm2。
The main improvement of the invention is embodied in the following four aspects:
1. and (3) performing grouping optimization on the data range of the cold rolling hardening mathematical model, and grouping the strength data of the cold rolling material hardening secondary mathematical model into 5 levels, wherein the data levels comprise 350-370 MPa, 440-490 MPa, 500-560 MPa, 620-650 MPa and 740-800 MPa. After optimization, the rolling force setting is reduced by about 15%, and the rolling force calculation precision is improved by about 15%.
2. Aiming at the characteristic that S1 and S2 frames bear larger reduction load in the rolling process, the roughness of the working roll of the S1 frame is improved to 1.0-1.5um, the roughness of the working roll of the S2 frame is improved to 0.8-1.0um, the phenomenon of frame slipping is easy to roll in a deformation area and control, and the rolling stability of the frame is improved.
3. A roll gap opening strategy is set for the adverse effect of long-time roll gap state maintenance on a steel strip deformation zone after the stop of the manufacturing process, and comprises the following steps: the rack entry clamp device is first pressed down S1. When the thickness of the finished strip steel is more than or equal to 0.8mm, the roll gaps of the S1-S5 frames are kept in a rolling state and are not opened; the thickness of the finished strip steel is less than 0.8mm, roll gaps of S3, S4 and S5 frames are opened, and roll gaps of S1 and S2 frames are kept in a rolling state and are not opened. The stability of the deformation zone in the starting rolling process can be effectively controlled.
4. One of the key factors for the stability of cold continuous rolling is tension. The method is used for adjusting the related frame in a targeted mannerComprising: the inlet tension of the rolling mill is adjusted to 240-260kN, the rolling force of the stands S1 and S2 is reduced by 10-15%, the rolling force of the stands S3 and S4 is reduced by 15-20%, and S5 is set to be in a rolling mode. If the thickness of the finished strip steel is less than or equal to 0.4mm, the tension between S3/S4 racks is further adjusted to 130-2S4/S5 tension between racks 140 and 150N/mm2. The unstable state of starting rolling tends to a stable state with lower tension, and stable rolling is realized.
Claims (1)
1. A method for controlling steel belt deviation and tearing by stopping, reproducing and starting a 5-stand cold rolling mill is characterized by comprising the following steps of: (1) grouping and optimizing the cold rolling hardening data range; (2) improving the roughness of the working rolls of the S1 frame and the S2 frame; (3) stopping and opening the roll gap; (4) the rolling force and the tension are adjusted by the re-production starting;
in the step (1), the strength data of the secondary mathematical model of the cold rolling material hardening are grouped into 5 levels, including 350-370 MPa, 440-490 MPa, 500-560 MPa, 620-650 MPa and 740-800 MPa;
in the step (2), the roughness of the working roll of the S1 frame is improved to 1.0-1.5um, and the roughness of the working roll of the S2 frame is improved to 0.8-1.0 um;
In the step (3), firstly pressing down the S1 rack inlet clamping device; when the thickness of the finished strip steel is more than or equal to 0.8mm, the roll gaps of the S1-S5 frames are kept in a rolling state and are not opened; the thickness of the finished strip steel is less than 0.8mm, roll gaps of an S3 rack, an S4 rack and an S5 rack are opened, and roll gaps of an S1 rack and an S2 rack are kept in a rolling state and are not opened;
in the step (4), the inlet tension of the rolling mill is adjusted to 240-260kN, the rolling force of the S1 stand and the S2 stand is reduced by 10-15%, the rolling force of the S3 stand and the S4 stand is reduced by 15-20%, and S5 is set to be in a rolling mode; if the thickness of the finished strip steel is less than or equal to 0.4mm, the tension between the S3 stand and the S4 stand is further adjusted to 130-140N/mm2The tension between the S4 frame and the S5 frame is 140-2。
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| CN202110255373.3A CN113083910B (en) | 2021-03-09 | 2021-03-09 | Method for controlling deviation and tearing of steel strip by stopping, re-producing and starting 5-stand cold rolling mill |
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| CN202110255373.3A CN113083910B (en) | 2021-03-09 | 2021-03-09 | Method for controlling deviation and tearing of steel strip by stopping, re-producing and starting 5-stand cold rolling mill |
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| CN113083910A CN113083910A (en) | 2021-07-09 |
| CN113083910B true CN113083910B (en) | 2022-06-28 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047230A (en) * | 1990-07-12 | 1990-11-28 | 西南计算中心 | Automatic control system for single steel plate cold rolling process |
| JP2001321809A (en) * | 2000-05-19 | 2001-11-20 | Nkk Corp | Method for cold-rolling steel strip |
| JP2003136105A (en) * | 2001-10-25 | 2003-05-14 | Nkk Corp | Method for manufacturing cold rolled steel plate |
| CN101607265A (en) * | 2009-06-11 | 2009-12-23 | 常熟华冶薄板有限公司 | The method of milling thin plate by four-high reversing cold mill |
| CN102341519A (en) * | 2009-03-05 | 2012-02-01 | 杰富意钢铁株式会社 | Cold-rolled steel sheet having excellent bendability, method for producing same, and member employing same |
| CN103191917A (en) * | 2012-01-05 | 2013-07-10 | 鞍钢股份有限公司 | Rolling process of high-strength cold-rolled strip steel |
| CN103785694A (en) * | 2013-11-22 | 2014-05-14 | 首钢总公司 | Method for preventing strip breakage on startup |
| CN105478473A (en) * | 2015-12-25 | 2016-04-13 | 中冶南方工程技术有限公司 | First-pass closed roll gap tail-swing rolling method for reversible cold rolling mill |
| CN105728473A (en) * | 2016-04-25 | 2016-07-06 | 中冶南方工程技术有限公司 | Control method for preventing deviation of band steel in first-pass rolling procedures |
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- 2021-03-09 CN CN202110255373.3A patent/CN113083910B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047230A (en) * | 1990-07-12 | 1990-11-28 | 西南计算中心 | Automatic control system for single steel plate cold rolling process |
| JP2001321809A (en) * | 2000-05-19 | 2001-11-20 | Nkk Corp | Method for cold-rolling steel strip |
| JP2003136105A (en) * | 2001-10-25 | 2003-05-14 | Nkk Corp | Method for manufacturing cold rolled steel plate |
| CN102341519A (en) * | 2009-03-05 | 2012-02-01 | 杰富意钢铁株式会社 | Cold-rolled steel sheet having excellent bendability, method for producing same, and member employing same |
| CN101607265A (en) * | 2009-06-11 | 2009-12-23 | 常熟华冶薄板有限公司 | The method of milling thin plate by four-high reversing cold mill |
| CN103191917A (en) * | 2012-01-05 | 2013-07-10 | 鞍钢股份有限公司 | Rolling process of high-strength cold-rolled strip steel |
| CN103785694A (en) * | 2013-11-22 | 2014-05-14 | 首钢总公司 | Method for preventing strip breakage on startup |
| CN105478473A (en) * | 2015-12-25 | 2016-04-13 | 中冶南方工程技术有限公司 | First-pass closed roll gap tail-swing rolling method for reversible cold rolling mill |
| CN105728473A (en) * | 2016-04-25 | 2016-07-06 | 中冶南方工程技术有限公司 | Control method for preventing deviation of band steel in first-pass rolling procedures |
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