CN104772332A - Method for improving double bulges at edge part of broadened intermediate slab in thick plate rolling process - Google Patents
Method for improving double bulges at edge part of broadened intermediate slab in thick plate rolling process Download PDFInfo
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- CN104772332A CN104772332A CN201410013321.5A CN201410013321A CN104772332A CN 104772332 A CN104772332 A CN 104772332A CN 201410013321 A CN201410013321 A CN 201410013321A CN 104772332 A CN104772332 A CN 104772332A
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- Prior art keywords
- slab
- rolling
- width
- plate
- steel
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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
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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
Abstract
The invention discloses a method for improving double bulges at an edge part of a broadened intermediate slab in a thick plate rolling process. The method comprises the following steps: (1) steel rotates to enable the width direction of a plate blank to be accordant with the direction of a rolling center line; (2) the rolling broadening is performed in the width direction of the plate blank; and (3) the steel rotates to enable the length direction of the plate blank to be consistent with the rolling center line, and vertical rollers arranged at the two sides of the width direction of the plate blank are adopted to apply lateral pressure on the side edge of the plate blank to eliminate double bulges at the edge part; the steps (1-3) are repeated until the plate blank is broadened to a target width; and the steel rotation is performed again for the plate blank, so that the length direction of the plate blank is consistent with the direction of the rolling center line, and the fixed-width rolling is performed for the plate blank to reach the thickness of a finished product. The method for improving double bulges at the edge part of the broadened intermediate slab in the thick plate rolling process can eliminate the double-bulge deformation at the edge part of the steel plate, so that the plane shape of the steel plate is improved, the yield of the finished steel plate is improved, and the production quality of the finished steel plate is improved.
Description
Technical field
The present invention relates to a kind of steel plate rolling method, particularly relate to a kind of control method of heavy plate rolling.
Background technology
Heavy plate rolling process is the process by being rolled into certain size steel plate compared with heavy slab, as shown in Figure 1, in this operation of rolling, the steel that turns of slab 1 is completed by the rotating roller be arranged at before and after milling train, slab 1 is after clockwise 90 ° turn steel, and its length direction is consistent with rolling direction, then after clockwise 90 ° turn steel, its width is consistent with rolling direction, and rolling is front and could continue rolling after all needing the flipper guide before and after with milling train to carry out centering to slab after turning steel.The rolling mode adopted in the operation of rolling is decided by slab and plate size.
In practical condition, for different slabs, heavy plate mill production line will be taked different control mode to be rolled.In one case, first by slab rolling along its length to eliminate the deviation on slab thickness direction; Then after turning steel, slab is rolled in the width direction, after being rolled down to certain target width, again turns steel; Finally slab rolling is become finished steel plate, the steel plate length direction after rolling is identical with the length direction of slab.In another case, first turn steel before the rolling, be then rolled in the width direction by slab, turn steel again, be finally rolled into finished steel plate after being rolled down to certain target width, the steel plate length direction after rolling is identical with the length direction of slab.
In addition, in yet another case, be also need first by slab rolling along its length to eliminate the deviation on slab thickness direction; Then with regard to direct, slab rolling is become finished steel plate after turning steel, now, the steel plate length direction after rolling is identical with the width of slab.
Adopt the rolling control technology can form planar disfigurement on finished steel plate.As shown in Figure 2, compared with target finished size, all occur that Double drum type is cashed at band steel dual-side edge A and B and resembled, namely occurred by edge groove defect internally on the width W of steel plate.Thus, need the width increasing slab before the rolling, making to roll rear steel plate when there is twin drum phenomenon, can excise its edge fault, to ensure the target width of finished steel plate.
Thus, adopt the rolling control technology to carry out rolled slab, not only can increase the blank amount of slab, also can reduce the lumber recovery of finished steel plate.
Summary of the invention
The object of the present invention is to provide a kind of method improving broadening intermediate blank edge twin drum in heavy plate rolling process, it can be avoided steel plate to produce side and generate twin drum deformation, improve the flat shape of steel plate, chi width is put with what reduce slab, improve the product quality of finished steel plate, thus promote the lumber recovery of production line of rolling mill.
To achieve these goals, the present invention proposes a kind of method improving broadening intermediate blank edge twin drum in heavy plate rolling process, it comprises step:
(1) turn steel, make the width of slab consistent with the direction of rolling centerline;
(2) width along slab is rolled broadening;
(3) turn steel, make the length direction of slab consistent with rolling centerline, adopt the edger roll being arranged on both sides, width of plate slab direction to apply lateral pressure to eliminate edge twin drum to slab side;
Repeat above-mentioned steps (1)-(3), until slab is broadened to target width;
Slab is turned steel again, makes the length direction of slab consistent with the direction of rolling centerline, fixed width is carried out to slab and is rolling to finished product thickness.
The method improving broadening intermediate blank edge twin drum in heavy plate rolling process of the present invention, first the width along slab after turning steel is rolled broadening, but owing to being subject to the impact of equipment roll torque, blank is thick and every time roll reduction is little, this blank only deforms at two contact surfaces, namely only there is areal deformation, that is, distortion in the operation of rolling is impermeable, this distortion is impermeable not only can cause the uneven deformation of slab plane, also in slab side, twin drum deformation can occur.
Thus, needing again to turn steel makes the length direction of slab and rolling centerline be consistent, edger roll is set in the both sides in width of plate slab direction and applies lateral pressure to eliminate the deformation of edge twin drum to slab side, but the deformation of edge twin drum is not just can be eliminated by a rolling, it needs just can be eliminated by repeatedly rolling, in other words, at rolled broadening in the process of target width, slab needs the step repeated through turning steel-width rolling broadening-turn again steel-length direction rolling broadening, the lateral pressure that the edger roll being arranged at width both sides applies then plays restriction for the twin drum deformation of slab, little with the Double drum type variable that the Double drum type variable guaranteed in spreading process each time is comparatively gone up once in spreading process, thus in the operation of rolling, eliminate the edge twin drum of slab gradually, finally make finished steel plate edge end face straight or substantially straight.
Further, of the present inventionly improve in the method for broadening intermediate blank edge twin drum in heavy plate rolling process, in above-mentioned steps (2), controlled rolling broadening ratio is 1.2-1.5, to eliminate the deformation of edge twin drum better, improve the flat shape of steel plate, thus reduce the resection of rolling rear steel plate.
Compared with the control technology of existing rolling slab, the method improving broadening intermediate blank edge twin drum in heavy plate rolling process of the present invention has the following advantages:
1) effectively eliminate the deformation of steel plate edge twin drum, improve the flat shape of steel plate;
2) that reduces incoming slab puts chi width, saves the blank amount of slab;
3) improve the lumber recovery of finished steel plate, promote the quality of production of finished steel plate.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of existing heavy plate rolling process.
The schematic diagram of finished steel plate of Fig. 2 for obtaining after adopting prior art controlled rolling slab.
Fig. 3 is the schematic flow sheet of method under a kind of embodiment improving broadening intermediate blank edge twin drum in heavy plate rolling process of the present invention.
Detailed description of the invention
Below in conjunction with Figure of description and specific embodiment, further explanation and explanation is made to the method improving broadening intermediate blank edge twin drum in heavy plate rolling process of the present invention, but following explanation and explanation do not form improper restriction for technical scheme of the present invention.
Fig. 3 shows the process step of method under a kind of embodiment improving broadening intermediate blank edge twin drum in heavy plate rolling process of the present invention of the present invention.
As shown in Figure 3, in the present embodiment, for specification for 400 × 1500 × 4600(mm) slab, its existing goal standard is 80 × 4430 × 7752(mm), adopt the method improving broadening intermediate blank edge twin drum in heavy plate rolling process of the present invention, its step comprises:
(A1) blank 11 turns of steel, make its width consistent with the direction P of rolling centerline;
(A2) controlled rolling broadening ratio is 1.5, and the width along slab is rolled broadening;
(A3) blank turns steel again, makes its length direction consistent with rolling centerline, adopts the edger roll being arranged on both sides, width of plate slab direction to apply lateral pressure to eliminate an edge twin drum deformation to slab side portion;
(B1) blank rotary steel, makes its width consistent with the direction P of rolling centerline;
(B2) controlled rolling broadening ratio is less than 1.5, and the width along slab is rolled broadening;
(B3) blank turns steel again, makes its length direction consistent with rolling centerline, adopts the edger roll being arranged on both sides, width of plate slab direction to apply lateral pressure again to eliminate the deformation of edge secondary twin drum to slab side portion;
(C1) blank rotary steel, makes its width consistent with the direction P of rolling centerline;
(C2) controlled rolling broadening ratio, the width along slab is rolled broadening;
(C3) blank turns steel again, makes its length direction consistent with rolling centerline, adopts the edger roll being arranged on both sides, width of plate slab direction to apply lateral pressure again to eliminate edge three twin drum deformation to slab side portion;
By slab rolling until slab is broadened to target width 4350mm;
Slab is turned steel again, make the length direction of slab consistent with the direction of rolling centerline, fixed width is carried out to slab and is rolling to finished product thickness, after rolling under above-mentioned embodiment, steel plate width is 4350mm, compared with width specifications 4430mm, it reduces 80mm, simultaneously, effectively improve the twin drum deformation of side edge of steel plate, make finished steel plate have good flat shape.
In above process, step (A1)-(A3) represents first time broadening, and step (B1)-(B3) represents second time broadening, and step (C1)-(C3) then represents third time broadening; The step of broadening is same or similar each time, but each time in broadening the relevant parameter of edger roll different, design parameter refers to table 1.Table 1 shows the passage of edger roll and the relevant parameter of depressing position in broadening each time.
In addition, in above-mentioned steps (A3), (B3) and (C3), can also be undertaken smooth by the thickening of plain-barreled roll to the slab side being provided with edger roll.
In addition, at second time broadening with before broadening terminates for the third time, edging process can also be carried out to charge length, to guarantee the squaring broadening of slab.
It should be noted that, under other embodiments, also rolling broadening ratio can be controlled as 1.2-1.5.Meanwhile, technical scheme of the present invention is not limited to the broadening of fixed number of times, and those skilled in the art according to the edge situation of slab, can carry out determining for broadening number of times and adjust in time, both ensured that slab rolling became target width, guaranteed again that slab side did not produce twin drum deformation.
Table 1.
Adopt the method improving broadening intermediate blank edge twin drum in heavy plate rolling process of the present invention to be rolled for slab, compare with the rolled plate adopting prior art to obtain, specifically refer to table 2.
Table 2 is for adopting technical scheme of the present invention and prior art to thickness >=340mm and the width before slab rolling of width >=1700mm puts the chi table of comparisons.
Table 2.
| Thickness spread ratio | <1.4 | 1.4～1.7 | 1.7～2.0 | ≥2.0 |
| Existingly put chi width | 140～160mm | 160～180mm | 180～200mm | ≥200mm |
| Chi width is put after improvement | 100～120mm | 120～140mm | 140～150mm | 150～160mm |
Can be learnt by table 2, adopt of the present invention when improving method rolling super-thick steel plate (thickness >=40mm) of broadening intermediate blank edge twin drum in heavy plate rolling process, not only can eliminate the Double drum type of the side of steel plate, improve the flat shape of thick stock steel plate, can also reduce special heavy plate roll before slab put chi width, meanwhile, existing lumber recovery is increased to 88.9% from 85.3%.
That enumerates it should be noted that above is only specific embodiments of the invention, obviously the invention is not restricted to above embodiment, has many similar changes thereupon.If all distortion that those skilled in the art directly derives from content disclosed by the invention or associates, protection scope of the present invention all should be belonged to.
Claims (2)
1. improve a method for broadening intermediate blank edge twin drum in heavy plate rolling process, it is characterized in that, comprise step:
(1) turn steel, make the width of slab consistent with the direction of rolling centerline;
(2) width along slab is rolled broadening;
(3) turn steel, make the length direction of slab consistent with rolling centerline, adopt the edger roll being arranged on both sides, width of plate slab direction to apply lateral pressure to eliminate edge twin drum to slab side;
Repeat above-mentioned steps (1)-(3), until slab is broadened to target width;
Slab is turned steel again, makes the length direction of slab consistent with the direction of rolling centerline, fixed width is carried out to slab and is rolling to finished product thickness.
2. improve the method for broadening intermediate blank edge twin drum in heavy plate rolling process as claimed in claim 1, it is characterized in that, in described step (2), controlled rolling broadening ratio is 1.2-1.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410013321.5A CN104772332A (en) | 2014-01-13 | 2014-01-13 | Method for improving double bulges at edge part of broadened intermediate slab in thick plate rolling process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410013321.5A CN104772332A (en) | 2014-01-13 | 2014-01-13 | Method for improving double bulges at edge part of broadened intermediate slab in thick plate rolling process |
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| CN104772332A true CN104772332A (en) | 2015-07-15 |
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| CN201410013321.5A Pending CN104772332A (en) | 2014-01-13 | 2014-01-13 | Method for improving double bulges at edge part of broadened intermediate slab in thick plate rolling process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107363093A (en) * | 2016-05-12 | 2017-11-21 | 鞍钢股份有限公司 | The thin specification steel plate milling method of blanket shape among before a kind of improvement rolling |
| CN112570450A (en) * | 2019-09-30 | 2021-03-30 | 宝钢湛江钢铁有限公司 | Thick plate rolling line and production method thereof |
| CN116713317A (en) * | 2023-05-31 | 2023-09-08 | 张家港宏昌钢板有限公司 | Steel plate rolling method based on thickness and widening ratio of steel plate blank |
-
2014
- 2014-01-13 CN CN201410013321.5A patent/CN104772332A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107363093A (en) * | 2016-05-12 | 2017-11-21 | 鞍钢股份有限公司 | The thin specification steel plate milling method of blanket shape among before a kind of improvement rolling |
| CN112570450A (en) * | 2019-09-30 | 2021-03-30 | 宝钢湛江钢铁有限公司 | Thick plate rolling line and production method thereof |
| CN112570450B (en) * | 2019-09-30 | 2022-03-01 | 宝钢湛江钢铁有限公司 | Thick plate rolling line and production method thereof |
| CN116713317A (en) * | 2023-05-31 | 2023-09-08 | 张家港宏昌钢板有限公司 | Steel plate rolling method based on thickness and widening ratio of steel plate blank |
| CN116713317B (en) * | 2023-05-31 | 2024-03-12 | 张家港宏昌钢板有限公司 | Steel plate rolling method based on thickness and widening ratio of steel plate blank |
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Application publication date: 20150715 |