CN113333464B - Method for reducing steel plate shearing buckling incidence rate with thickness of more than 23mm - Google Patents
Method for reducing steel plate shearing buckling incidence rate with thickness of more than 23mm Download PDFInfo
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- CN113333464B CN113333464B CN202110546316.0A CN202110546316A CN113333464B CN 113333464 B CN113333464 B CN 113333464B CN 202110546316 A CN202110546316 A CN 202110546316A CN 113333464 B CN113333464 B CN 113333464B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B43/00—Cooling beds, whether stationary or moving; Means specially associated with cooling beds, e.g. for braking work or for transferring it to or from the bed
- B21B43/04—Cooling beds comprising rolls or worms
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a method for reducing the occurrence rate of buckling of a steel plate with the thickness of more than 23mm, which comprises the following steps of discharging a steel billet out of a furnace, rolling the steel billet by a roughing mill and a finishing mill, straightening by a pre-straightening machine, ultra-fast cooling, straightening by a finishing straightening machine, and then reaching a segmented shear; the segmentation shearing operator clicks a roller bed advancing or retreating button according to the size of the three-level steel plate issued by the MES system and the position of a field scale to convey the steel plate to a corresponding position; starting shearing; the upper blade drops the steel plate from the inner side to the outer side, the steel plate is not sheared after the upper blade drops for 1 second, the table roller way is swung after the shearing is started, and the first daughter board is conveyed to the cooling bed roller way after the steel plate is sheared; lifting the upper blade after the steel plate is sheared; and opening a front shearing roller way, and then conveying the second daughter board steel plate to a cooling bed roller way. The buckling of the steel plate due to the compression of the inner side in the shearing process is reduced.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a method for reducing the occurrence rate of steel plate shearing buckling with the thickness of more than 23 mm.
Background
At present, the curvature of a 2800 medium plate line steel plate is as high as 6%, wherein the shearing buckling incidence rate is about 1.82%, the buckling of the steel plate needs to be carried out by procedures of flattening, cold straightening and the like, the production cost is greatly increased, even the contract exchange rate is influenced, and the buckling problem of the steel plate becomes a big mountain transversely spanned in front of a medium plate factory. The phenomena of transverse pot shape of the head and the tail of the steel plate, longitudinal warping and buckling of the head and the tail, wave bending and the like of the steel plate are basically controlled in a middle plate factory through technical attack. At this stage, the shear buckling type steel plate already accounts for about 50% of the total amount of the buckling plate.
2800, the production line of the plate factory has complicated and varied specifications, including 6-60mm low alloy and part of high strength products, wherein the segmented shearing capacity is weaker, and only steel plates with the thickness of less than 40mm can be sheared, and the steel plates with the thickness of more than 23mm have higher shearing buckling incidence after being sheared, thus seriously affecting the production cost and contract exchange rate. Therefore, the problem of steel plate shear buckling needs to be solved.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides a method for reducing the occurrence rate of steel plate shearing buckling with the thickness of more than 23mm, which comprises the following steps:
s1, discharging the steel billet out of the furnace, rolling the steel billet by a roughing mill and a finishing mill, straightening by a pre-straightening machine, ultra-fast cooling, straightening by a finishing straightening machine, and then reaching a section shear to prepare for shearing and sectioning;
s2, the segmentation shear operator inching a forward or backward roller way button according to the size of the three-level steel plate issued by the MES system and the position of the on-site scale to convey the steel plate to a corresponding position;
s3, pressing a shearing button to start shearing;
s4, the upper blade drops the steel plate from the inner side to the outer side, when the upper blade drops for 1 second, the steel plate is not cut, the table roller way is swung after the cutting, and the first steel plate is conveyed to the cooling bed roller way after the steel plate is cut;
s5, lifting the upper blade after the steel plate is sheared;
and S6, opening a front shearing roller way, and then conveying the second daughter board steel plate to a cooling bed roller way.
The technical scheme of the invention is further defined as follows:
the method for reducing the incidence rate of the steel plate shear buckling with the thickness of more than 23mm is suitable for the steel plate with the thickness of 23-40 mm.
According to the method for reducing the buckling incidence rate of the steel plate with the thickness of more than 23mm, a segmentation shear operator automatically adjusts the shearing mode according to the plate shape condition, and if a pot-shaped steel plate is met, a table roller way does not need to be swung after shearing.
In the method for reducing the shearing buckling incidence rate of the steel plate with the thickness of more than 23mm, the length of the steel plate mother plate needs to be more than 12 m.
In the method for reducing the steel plate shearing buckling incidence rate with the thickness of more than 23mm, the frequency of clicking the roller bed button is 1 time/second.
The method for reducing the occurrence rate of the steel plate shearing buckling with the thickness of more than 23mm comprises the steps of hoisting a steel blank onto a stacking plate table by a feeding travelling crane, then pressing a steel pushing button by an operator to push the steel blank onto a feeding roller way, pushing the steel blank into a furnace tail by a steel pushing machine after the steel blank runs to a specified position of the furnace tail, heating the steel blank to a specified process by three stepping heating furnaces according to a temperature system assigned by an MES system, discharging the steel from a furnace head, conveying the steel to a roughing mill by a furnace roller way, controlling the blank discharging and the width of the roughing mill by the roughing mill, conveying the intermediate blank to a finishing mill, rolling the intermediate blank into a semi-finished product by the finishing mill, then conveying the semi-finished product to ultra-fast cooling, cooling the steel plate by the ultra-fast cooling operator, conveying the steel plate to a straightening machine, straightening the steel plate by the finishing mill, conveying the steel plate to a section shear for cutting and sectioning, conveying the steel plate to a cooling bed for cooling, discharging, and cutting, And (7) warehousing.
The beneficial effects of the invention are:
(1) according to the invention, the swing platform is opened in advance, so that the two ends of the steel plate are subjected to tensile stress, the bending degree of the shearing opening of the steel plate is effectively reduced, the shearing buckling of the steel plate caused by the compression of the inner side in the shearing process is reduced, the problem of the shearing buckling of the steel plate with the thickness of more than 23mm is solved, and the shearing buckling incidence rate is reduced to be less than 0.8% from 1.82%. More importantly, the shearing method does not scratch the steel plate because the roller way is opened in advance, and the original production rhythm is not influenced;
(2) the implementation of the heating, steel rolling, cooling, segmenting and other processes in the invention all issue instructions through the MES system, and the implementation of the MES system realizes resource allocation and monitoring, operation planning and scheduling, production scheduling and optimization and the like, so that the production efficiency is improved, and the process waste is reduced.
Detailed Description
The method for reducing the occurrence rate of the steel plate shearing buckling of the steel plate with the thickness of more than 23mm is particularly suitable for the steel plate with the thickness of 23-40mm, the length of a mother plate of the steel plate needs to be more than 12m, a feeding travelling crane hoists the steel blank to a plate stacking platform, then an operator pushes a steel pushing button to push the steel blank to a feeding roller way, the steel blank runs to a furnace tail designated position, a steel pushing machine pushes the steel blank to the furnace tail, three stepping heating furnaces heat the steel blank to a designated process according to a temperature system assigned by an MES system, a furnace head steel tapping machine taps the steel, the steel blank is conveyed to a roughing mill through a furnace front roller way, the roughing mill is responsible for cogging and width control, then the intermediate blank is conveyed to a finishing mill, the finishing mill rolls the intermediate blank into a semi-finished product, then the intermediate blank is conveyed to an ultra-fast cooling machine, the ultra-fast cooling operator cools the steel plate and then conveys the steel plate to a fine straightener, the straightening machine prepares to straighten the steel plate, and finally, conveying the steel plate to a section shear for shearing and sectioning, and conveying the steel plate to a cooling bed for cooling, offline and warehousing after sectioning.
The segmentation shear comprises the following steps:
s1, discharging the steel billet out of the furnace, rolling the steel billet by a roughing mill and a finishing mill, straightening by a pre-straightening machine, carrying out ultra-fast cooling, straightening by a finishing straightening machine, and then reaching a section shear to prepare for shearing and sectioning;
s2, the segmentation shear operator inching the forward or backward roller way button according to the size of the three-level steel plate issued by the MES system and the position of the on-site scale, wherein the inching frequency is 1 time/second, and conveying the steel plate to a corresponding position;
s3, pressing a shearing button to start shearing;
s4, the upper blade drops the steel plate from the inner side to the outer side, the steel plate is not cut off after the upper blade drops for 1 second, the table roller way is swung after the cutting, and the first steel plate is conveyed to the cooling bed roller way after the steel plate is cut off;
s5, lifting the upper blade after the steel plate is sheared;
and S6, opening the front shearing roller way, and then conveying the second daughter board steel plate to the cooling bed roller way.
The segmentation shear operator automatically adjusts the shearing mode according to the plate shape condition, if a pot-shaped steel plate is met, a table roller way needs not to be opened after shearing.
Because the inner side steel plate is preferentially pressed in the shearing process of the upper blade, when the blade is sheared to the outer side, the inner side part is still under pressure, the phenomenon of bending the head of a sheared edge is easily generated, and the buckling incidence rate is greatly increased. The unevenness of the ordinary steel plate is required to be 8mm/2m, the cut is about lying about 8-10mm in the original cutting mode, and the judgment is unqualified. After the method is used, the degree of lying prone is reduced, the unevenness is about 3mm/2m, and the qualified standard is reached.
The steel plates rolled by the factory are 200 ten thousand tons per year, the steel plates with the thickness of more than 23mm are about 80 ten thousand tons per year, the cost of cold straightening and flattening for steel plate buckling is 180 yuan per ton, the shearing buckling incidence rate is reduced from 1.82% to 0.68% at the present stage, and therefore the annual cold straightening and flattening saving cost is saved by 800000 x (1.82% -0.68%) × 180=164 ten thousand yuan.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. A method for reducing the occurrence rate of steel plate shearing buckling with the thickness of more than 23mm is characterized by comprising the following steps: the method comprises the following steps:
s1, discharging the steel billet out of the furnace, rolling the steel billet by a roughing mill and a finishing mill, straightening by a pre-straightening machine, ultra-fast cooling, straightening by a finishing straightening machine, and then reaching a section shear to prepare for shearing and sectioning;
s2, the segmentation shear operator clicks a forward or backward roller way button according to the size of the three-level steel plate issued by the MES system and the position of the on-site scale to convey the steel plate to a corresponding position;
s3, pressing a shearing button to start shearing;
s4, the upper blade drops the steel plate from the inner side to the outer side, when the upper blade drops for 1 second, the steel plate is not cut, the table roller way is swung after the cutting, and the first steel plate is conveyed to the cooling bed roller way after the steel plate is cut;
s5, lifting the upper blade after the steel plate is sheared off;
and S6, opening a front shearing roller way, and then conveying the second daughter board steel plate to a cooling bed roller way.
2. The method for reducing the incidence of shear buckling of a steel plate with a thickness of 23mm or more as claimed in claim 1, wherein: is suitable for steel plates with the thickness of 23-40 mm.
3. The method for reducing the incidence of shear buckling of a steel plate with a thickness of 23mm or more as claimed in claim 1, wherein: the segmentation shear operator automatically adjusts the shearing mode according to the plate shape condition, and if a pot-shaped steel plate is met, the table roller way does not need to be swung after the shear is started.
4. The method for reducing the incidence of shear buckling of a steel plate with a thickness of 23mm or more as claimed in claim 1, wherein: the length of the steel plate mother plate needs to be more than 12 m.
5. The method for reducing the incidence of shear buckling of a steel plate with a thickness of 23mm or more according to claim 1, wherein: the frequency of clicking the roller bed button is 1 time/second.
6. The method for reducing the incidence of shear buckling of a steel plate with a thickness of 23mm or more as claimed in claim 1, wherein: a loading traveling crane lifts a steel billet to a stacking plate platform, then an operator presses a steel pushing button to push the steel billet to a loading roller way, the steel billet runs to a furnace tail designated position, a steel pusher pushes the steel billet into the furnace tail, three stepping heating furnaces heat the steel billet to a designated process according to a temperature system issued by an MES system, the steel is discharged from a furnace end steel tapping operator, the steel billet is conveyed to a roughing mill through a furnace front roller way, the roughing mill is responsible for cogging and width control, then an intermediate billet is conveyed to a finishing mill, the finishing mill rolls the intermediate billet into a semi-finished product, then the semi-finished product is conveyed to ultra-fast cooling, the ultra-fast cooling operator cools the steel plate and then conveys the steel plate to a fine straightening machine for straightening, the fine straightening machine straightens the steel plate, finally conveys the steel plate to a section shear for section shearing, and after section conveying to a cooling bed for cooling, unloading and warehousing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110546316.0A CN113333464B (en) | 2021-05-19 | 2021-05-19 | Method for reducing steel plate shearing buckling incidence rate with thickness of more than 23mm |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110546316.0A CN113333464B (en) | 2021-05-19 | 2021-05-19 | Method for reducing steel plate shearing buckling incidence rate with thickness of more than 23mm |
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| CN113333464A CN113333464A (en) | 2021-09-03 |
| CN113333464B true CN113333464B (en) | 2022-08-19 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103537512A (en) * | 2013-10-11 | 2014-01-29 | 南阳汉冶特钢有限公司 | Method for using normalizing line temperature-waiting straightening for remedying buckling steel plate with thickness smaller than 30mm |
| CN204209217U (en) * | 2014-11-25 | 2015-03-18 | 河南万达铝业有限公司 | 2400 hot-rolling mill cut deal transverse cutting unit Novel guide plates |
| CN108274065A (en) * | 2018-01-19 | 2018-07-13 | 山东钢铁集团日照有限公司 | A kind of fixed ruler baffle guard system and control method |
| CN208743785U (en) * | 2018-09-27 | 2019-04-16 | 天津市中重科技工程有限公司 | A kind of swing type hydraulic cutter |
| CN210996799U (en) * | 2019-09-20 | 2020-07-14 | 中冶南方工程技术有限公司 | Excess material cleaning system after shearing and sizing of hot rolled bar |
| CN112337974A (en) * | 2020-11-02 | 2021-02-09 | 南京钢铁股份有限公司 | Improve multiple length flying shear and cut afterbody bending structure |
-
2021
- 2021-05-19 CN CN202110546316.0A patent/CN113333464B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103537512A (en) * | 2013-10-11 | 2014-01-29 | 南阳汉冶特钢有限公司 | Method for using normalizing line temperature-waiting straightening for remedying buckling steel plate with thickness smaller than 30mm |
| CN204209217U (en) * | 2014-11-25 | 2015-03-18 | 河南万达铝业有限公司 | 2400 hot-rolling mill cut deal transverse cutting unit Novel guide plates |
| CN108274065A (en) * | 2018-01-19 | 2018-07-13 | 山东钢铁集团日照有限公司 | A kind of fixed ruler baffle guard system and control method |
| CN208743785U (en) * | 2018-09-27 | 2019-04-16 | 天津市中重科技工程有限公司 | A kind of swing type hydraulic cutter |
| CN210996799U (en) * | 2019-09-20 | 2020-07-14 | 中冶南方工程技术有限公司 | Excess material cleaning system after shearing and sizing of hot rolled bar |
| CN112337974A (en) * | 2020-11-02 | 2021-02-09 | 南京钢铁股份有限公司 | Improve multiple length flying shear and cut afterbody bending structure |
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| CN113333464A (en) | 2021-09-03 |
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