CN106311757A - Method for reducing cutting loss of wide and thick plates - Google Patents

Method for reducing cutting loss of wide and thick plates Download PDF

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Publication number
CN106311757A
CN106311757A CN201610878305.1A CN201610878305A CN106311757A CN 106311757 A CN106311757 A CN 106311757A CN 201610878305 A CN201610878305 A CN 201610878305A CN 106311757 A CN106311757 A CN 106311757A
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China
Prior art keywords
steel plate
value
valley
rolling
maximum
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CN201610878305.1A
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Chinese (zh)
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CN106311757B (en
Inventor
陈富强
黄贞益
廖仕军
汪杰
张朋彦
郑明哲
王玉娇
王翊然
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Anhui University of Technology AHUT
Nanjing Iron and Steel Co Ltd
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Anhui University of Technology AHUT
Nanjing Iron and Steel Co Ltd
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Priority to CN201610878305.1A priority Critical patent/CN106311757B/en
Publication of CN106311757A publication Critical patent/CN106311757A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/16Control of thickness, width, diameter or other transverse dimensions
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/72Rear end control; Front end control

Abstract

The invention relates to a method for reducing cutting loss of wide and thick plates. The edge cutting amount of steel plates can be reduced effectively by reasonably controlling values of head tails and fish tails of the steel plates and the recessed values of edges, so that the yield of the wide and thick plates is improved. Compared with the prior art, the method for reducing the cutting loss of the wide and thick plates has the advantages that the cutting loss of the steel plates is reduced obviously after the method is used, and the yield of each steel plate can be increased by about 0.2%-0.7%.

Description

A kind of reduce the method that Wide and Thick Slab cuts damage
Technical field
The invention belongs to Plate rolling technical field, the most originally relate to a kind of reducing the method that Wide and Thick Slab cuts damage.
Background technology
In the operation of rolling of Wide and Thick Slab, steel plate crop damages and accounts for about the 26.0% of total losses, and swarf damages and accounts for total damage About the 23.0% of consumption.Visible, the damage of cutting of Wide and Thick Slab accounts for about the 49.0% of total losses.But, Wide and Thick Slab flat shape good Badly determining its size cutting damage value, its size cutting damage value directly reflects the height of its lumber recovery;Therefore, can be by controlling Steel plain shape improves its lumber recovery.Affecting the factor of Wide and Thick Slab flat shape, numerous (present invention is just for MAS flat shape Controlled rolling), specifically include that rolling mode, MAS control accuracy, blank shape, AGC etc.;Wherein, the step of MAS rolling Height is the principal element controlling steel plain shape, can effectively be controlled by the shoulder height reasonably adjusting MAS rolling The edge of steel plate and Head and Tail Shape.Steel plate circular arc evagination end to end, steel plate edge are barrel-shaped, steel plate dovetail end to end is relatively big, steel plate edge The bigger grade of indent all can cause increasing considerably of swarf amount.
Roll back plane shape defect problem for Wide and Thick Slab, currently available technology has substantial amounts of research, MAS rolling, DBR rolling, featheredge broadening rolling, edger roll pressure measurement rolling, without trimming rolling.The big Heavy Plate Rolling Line of most domestic MAS rolling is used to control the flat shape of Wide and Thick Slab so that it is lumber recovery is greatly enhanced.But, its steel plate is end to end And shape the not up to micro-evagination of optimization, i.e. finished product steel plate head tail and edge, straight or micro-indent, such is end to end and limit It is the biggest that portion's shape cuts damage value.
Summary of the invention
The technical problem to be solved is that providing a kind of reduces the method that Wide and Thick Slab cuts damage, can effectively subtract Damage value cut by few steel plate, improves the lumber recovery of Wide and Thick Slab.
The present invention solves the technical scheme of above technical problem:
A kind of reduce the method that Wide and Thick Slab cuts damage, roll for MAS plan view control, including:
(i) the shoulder height value by controlling broadening passage MAS rolling controls the Head and Tail Shape of Wide and Thick Slab, makes steel plate End to end in fish tail shape, interior valley a of this fish tail is relevant with the broadening ratio of steel plate and compression ratio, and its value is as shown in table 1;
Table 1:
(ii) by controlling to shape the shape of the shoulder height value control Wide and Thick Slab of passage MAS rolling, steel plate limit is made Portion is micro-inner concavity, and interior valley is 10-20mm.
Specifically include following steps:
(1) first with flat shape detection device, the steel plain shape that will shear is detected on shearing line, obtain Take flat shape and the data of steel plate;
(2) according to maximum interior valley at and the steel plate tail fish of the steel plate head tail data screening steel plate head fish tail obtained Tail maximum in valley aw, solve the meansigma methods of at Yu aw, and be averaged value and be designated as interior valley a of steel plate fish tail end to end;
(3) according to the steel plate edge shape obtained and the left side, data screening steel plate limit maximum evagination value bz and maximum indent Value cz, on the right of screening steel plate limit, valley cy in maximum evagination value by and maximum, solves the meansigma methods of bz Yu by, and is averaged value It is designated as maximum evagination value b of steel plate edge, solves the meansigma methods of cz Yu cy, and be averaged value and be designated as the imperial palace of steel plate edge Valley c;
(4) a, b, c value of acquisition being fed back to milling train level two, milling train level two is by a, b, c value fed back and target Value compares, and revises corresponding MAS rolling parameter, i.e. shoulder height value h of amendment MAS rolling, thus after changing rolling Steel plate fish tail end to end in valley a;
(5) amended MAS rolling parameter is applied to follow-up same broadening ratio and the Plate rolling of same ratio of elongation, Guarantee that interior valley a of amended steel plate fish tail end to end is close with the value in table 1 or equal, it is ensured that amended steel plate edge in Micro-inner concavity, and interior valley is 10-20mm, i.e. b value does not exists and c value takes 10-20mm.
The invention has the beneficial effects as follows: use technique scheme, compared with prior art: roll rear steel plate end to end and limit Portion cuts damage and significantly reduces, and lumber recovery can improve about 0.2%-0.7%, can be that Wide and Thick Slab manufacturing enterprise brings the most economic effect Benefit.
Above-mentioned steel plate fish tail a end to end and edge convex or concave schematic shapes as it is shown in figure 1, wherein solid rectangular line enclosed The region become is the scope sheared during steel plate edge evagination, shearing when dotted line area defined is steel plate edge indent Region;Use the rolled piece longitudinal section after MAS rolling as shown in Figure 3.
Accompanying drawing explanation
Fig. 1 is steel plate fish tail a end to end and edge evagination b or the schematic shapes of indent c.
Fig. 2 is the partial enlarged drawing of Fig. 1.
Fig. 3 is the rolled piece longitudinal section after using MAS rolling.
Fig. 4 is the control method flow chart of the present invention.
Detailed description of the invention
In order to make the above-mentioned purpose of the present invention, feature and advantage energy easier to understand, below in conjunction with example to the present invention Elaborate:
Embodiment one: Q690D high-strength plate;
Billet size: 260 × 2070 × 2792mm;Order size: 25 × 2500 × 21600mm;
Rolling mode: vertical-horizontal-vertical;
Broadening ratio: 1.23;
Method flow as shown in Figure 4, specifically comprises the following steps that
Initial condition: shaping shoulder height h of rolled piece after passage MAS rolls is 2.6mm, rolls after the rolling of broadening passage MAS Shoulder height h of part is 3.0mm.
The flat shape detection device that rolling is sheared after terminating on line detects rolling rear steel plain shape and obtains Steel plain shape data, the steel plate data of feedback are: steel plate actual size 25 × 2533 × 23195mm, steel plate head fish tail Interior valley at is-40mm, and in steel plate tail fish tail, valley aw is-20mm, and can try to achieve valley a in steel plate fish tail end to end is-30mm; In steel plate edge maximum valley cz be 32mm, cy be 25mm, can try to achieve valley c in steel plate edge maximum is 29.5mm;
By above-mentioned data feedback to milling train level two, detection value of feedback is carried out by level two with the desired value in table 1 Relatively, determine that the shoulder height of shaping and the rolling of broadening passage MAS adjusts trend;
Understanding according to step 3, milling train level two operative employee should reduce the MAS rolling step height value h shaping passage, And the MAS increasing broadening passage rolls step height value h;
The Plate rolling of ratio of elongation the most same to same broadening, repeats above-mentioned 4 steps, until steel plate fish tail end to end The interior valley of interior valley and steel plate edge reaches desired value, and preserves shaping passage now and the shoulder height value of broadening passage h。
The MAS rolling step height value h shaping passage is adjusted to 2.2mm by the present invention, and the MAS of broadening passage rolls step Height value h is adjusted to 3.6mm, and gained plate size is 25 × 2533 × 23238mm.In steel plate head fish tail, valley at is 104mm, in steel plate tail fish tail, valley aw is 98mm;In steel plate edge maximum valley cz be 15mm, cy be 17mm.More than according to Data analysis understands, and when using the inventive method, the effective length of steel plate is 22548mm;When using prior art, having of steel plate Imitate a length of 22495mm.During visible employing the inventive method, the effective length of steel plate adds 53mm.It is converted into becoming a useful person of steel plate Rate understands, and the lumber recovery of steel plate improves 0.23%.
Embodiment two: S355J low carbon-structural steel plate;
Billet size: 260 × 2070 × 2792mm;Order size: 35 × 3500 × 11000mm;
Rolling mode: vertical-horizontal-vertical;
Broadening ratio: 1.74;
Method flow as shown in Figure 4, specifically comprises the following steps that
1, initial condition: shaping shoulder height h of rolled piece after passage MAS rolls is 4.2mm, after the rolling of broadening passage MAS Shoulder height h of rolled piece is 0.2mm.
2, the flat shape detection device sheared after rolling terminates on line detects rolling rear steel plain shape and obtains Taking steel plain shape data, the steel plate data of feedback are: steel plate actual size 35 × 3650 × 11760mm, steel plate head fish In tail, valley at is 0mm, and in steel plate tail fish tail, valley aw is-10mm, and can try to achieve valley a in steel plate fish tail end to end is-5mm; In steel plate edge maximum valley cz be 25mm, cy be 20mm, can try to achieve valley d in steel plate edge maximum is 22.5mm;
3, by above-mentioned data feedback to milling train level two, detection value of feedback is entered by level two with the desired value in table 1 Row compares, and determines that the shoulder height of shaping and the rolling of broadening passage MAS adjusts trend;
4, understanding according to step 3, milling train level two operative employee should reduce the MAS rolling step height value shaping passage H, and increase the MAS rolling step height value h of broadening passage;
5, the Plate rolling of ratio of elongation the most same to same broadening, repeats above-mentioned 4 steps, until steel plate fish end to end In tail, the interior valley of valley and steel plate edge reaches desired value, and preserves shaping passage now and the shoulder height of broadening passage Value h.
The MAS rolling step height value h shaping passage is adjusted to 4mm by the present invention, and the MAS rolling step of broadening passage is high Angle value h is adjusted to 1.2mm, and gained plate size is 35 × 3650 × 11845mm.In steel plate head fish tail, valley at is 80mm, In steel plate tail fish tail, valley aw is 85mm;In steel plate edge maximum valley cz be 13mm, cy be 16mm.Divide according to data above Analysis understands, and when using the inventive method, the effective length of steel plate is 11585mm;When using prior art, the effective length of steel plate For 11500mm.During visible employing the inventive method, the effective length of steel plate adds 85mm.The lumber recovery being converted into steel plate can Knowing, the lumber recovery of steel plate improves 0.74%.
In addition to the implementation, the present invention can also have other embodiments.All employing equivalents or equivalent transformation shape The technical scheme become, all falls within the protection domain of application claims.

Claims (2)

1. reduce the method that Wide and Thick Slab cuts damage, roll for MAS plan view control, it is characterised in that: including:
(i) the shoulder height value by controlling broadening passage MAS rolling controls the Head and Tail Shape of Wide and Thick Slab, makes steel plate end to end In fish tail shape, interior valley a of this fish tail is relevant with the broadening ratio of steel plate and compression ratio, and its value is as shown in table 1;
Table 1:
(ii) by control shape passage MAS rolling shoulder height value control Wide and Thick Slab shape, make steel plate edge in Micro-inner concavity, interior valley is 10-20mm.
2. as claimed in claim 1 reduce the method that Wide and Thick Slab cuts damage, it is characterised in that: specifically include following steps:
(1) first with flat shape detection device, the steel plain shape that will shear is detected on shearing line, obtain steel The flat shape of plate and data;
According to the steel plate head tail data screening steel plate head fish tail obtained maximum in valley at and steel plate tail fish tail Valley aw in maximum, solves the meansigma methods of at Yu aw, and is averaged value and is designated as interior valley a of steel plate fish tail end to end;
(3) according to valley cz in the steel plate edge shape obtained and the left side, data screening steel plate limit maximum evagination value bz and maximum, Valley cy in maximum evagination value by and maximum on the right of screening steel plate limit, solves the meansigma methods of bz Yu by, and is averaged value and is designated as Maximum evagination value b of steel plate edge, solves the meansigma methods of cz Yu cy, and be averaged value be designated as steel plate edge maximum in valley c;
(4) a, b, c value of acquisition being fed back to milling train level two, a, b, c value of feedback is entered by milling train level two with desired value Row compares, and revises corresponding MAS rolling parameter, i.e. shoulder height value h of amendment MAS rolling, thus changes the steel after rolling Valley a in wrench tail fish tail;
(5) amended MAS rolling parameter is applied to follow-up same broadening ratio and the Plate rolling of same ratio of elongation, it is ensured that Interior valley a of amended steel plate fish tail end to end is close with the value in table 1 or equal, it is ensured that amended steel plate edge is micro-interior Concavity, and interior valley is 10-20mm, i.e. b value does not exists and c value takes 10-20mm.
CN201610878305.1A 2016-10-08 2016-10-08 A kind of method for reducing Wide and Thick Slab and cutting damage Active CN106311757B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4238946A (en) * 1977-04-04 1980-12-16 Kawasaki Steel Corporation Method for rolling metal plate
CN102974624A (en) * 2012-12-06 2013-03-20 秦皇岛首秦金属材料有限公司 Edge plane shape control method of large-expansion-ratio high strength grade pipeline steel
CN103252347A (en) * 2012-02-21 2013-08-21 宝山钢铁股份有限公司 Continuous cast slab head and tail shape pre-controlling method capable of reducing hot-rolled intermediate slab head and tail cutting quantities
CN104747891A (en) * 2013-12-30 2015-07-01 福建三钢闽光股份有限公司 Intermediate blank rolled piece shape control method after last-pass broadening during medium plate production

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4238946A (en) * 1977-04-04 1980-12-16 Kawasaki Steel Corporation Method for rolling metal plate
CN103252347A (en) * 2012-02-21 2013-08-21 宝山钢铁股份有限公司 Continuous cast slab head and tail shape pre-controlling method capable of reducing hot-rolled intermediate slab head and tail cutting quantities
CN102974624A (en) * 2012-12-06 2013-03-20 秦皇岛首秦金属材料有限公司 Edge plane shape control method of large-expansion-ratio high strength grade pipeline steel
CN104747891A (en) * 2013-12-30 2015-07-01 福建三钢闽光股份有限公司 Intermediate blank rolled piece shape control method after last-pass broadening during medium plate production

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