CN104415974A - Finish rolling head-up control method of hot rolled strip production - Google Patents
Finish rolling head-up control method of hot rolled strip production Download PDFInfo
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- CN104415974A CN104415974A CN201310390430.4A CN201310390430A CN104415974A CN 104415974 A CN104415974 A CN 104415974A CN 201310390430 A CN201310390430 A CN 201310390430A CN 104415974 A CN104415974 A CN 104415974A
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- finish rolling
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- nose
- temperature
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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
- B21B37/72—Rear end control; Front end control
Abstract
A finish rolling head-up control method of hot rolled strip production comprises the following steps: (1) improving the temperature difference in thickness direction by using lower water spray before finish rolling descaling, switching on the lower water spray before finish rolling descaling, so as to reduce the lower surface temperature of the strip steel, thereby reducing the occurrence of head-up of the front machine frame; (2) dummying one machine frame between F2-F4 in rolling process. Due to the heat loss of strip steel at high temperature is substantially thermal radiation, when the intermediate blank is transmitted on the roller bed, the thermal radiation of the upper surface is greater than that of the lower surface, thus easily causing the lower surface temperature of the intermediate blank greater than that of the upper surface, thereby causing the lower surface extension of the strip steel greater than that of the upper surface during the rolling process, and further leading to a head-up phenomenon. Based on the finish rolling head-up control method of hot rolled strip production, the occurrence of head-up of the front machine frame is reduced by switching on the lower water spray before the finish rolling descaling in order to reduced the lower surface temperature of the strip steel.
Description
Technical field
The invention belongs to hot-strip production technical field, be applicable to hot-strip and produce the control of finishing stands rolled piece end bending.
Background technology
Hot-strip is a kind of important steel products, applies extremely extensive.Hot-strip can be divided into by the difference of material, performance: carbon structural steel, low-alloy steel, steel alloy; Can be divided into by purposes: structural steel, welded gas cylinder and steels for pressure vessel use, pipeline steel, cold formability steel etc.Hot continuous rolling is one of main mode of production of hot-strip, and its master operation is as Fig. 1.Fig. 2 is that schematic diagram produced by a typical hot-strip.
Nose refers in the operation of rolling, band steel go out mill roll-gap after the phenomenon of warpage up or down, be illustrated in fig. 3 shown below.Nose is that recurrent problem in finishing stand produced by hot-strip, and nose gently then causes downstream frame to nip difficulty, and downstream frame will be caused time serious to sting to enter and steel scrap.
Nose problem easily brings production accident and steel scrap, also can affect product quality, must control effectively.Therefore, domestic and international hot-strip factory all attaches great importance to nose problem in hot-strip production.The reason of nose is caused to be the Asymmetric Rolling of thickness direction, namely the distortion up and down that causes for a certain reason of strip plastic deformation district is asymmetric and uneven, influence factor comprises that top and bottom rolls roller footpath is poor, the fast difference of roller, surface state difference, belt steel thickness direction temperature difference etc.
Based on nose problem and steel billet, thickness direction in heating furnace heats correlation that is uneven and the top and bottom temperature difference, and patent JP08243615A discloses a kind of control method, is to change the top and bottom temperature difference by controlling the heating and thermal insulation time, thus control objectives nose amount.In producing for hot-strip, the phase transformation caused because belt steel thickness direction temperature is uneven, strain inequality and nose problem, patent JP08318303A and JP05237530A discloses a kind of control method, by the upper and lower cooling water inflow of adjustment inlet of rolling mill, control the inhomogeneities of the Temperature Distribution of thickness direction and phase transformation, strain, thus improve nose problem.Above-mentioned patent is all the nose caused for thickness direction temperature contrast, and in actual production, influence factor may be complicated, namely also has the nose problem that other factors are brought, as poor in top and bottom rolls roller footpath, the fast difference of roller, surface state difference etc.
Patent JP2008043982A discloses a kind of control method, is the nose situation according to rolled piece, and by controlling up-down rollers speed difference and being equipped with brush roll, control roller surface state and differential friction control rolled piece end bending.Patent JP10137829A discloses a kind of control method, is to adopt checkout gear to measure nose amount and rolled piece moment, and detection data are transported to process computer after treatment and control.Above-mentioned patent all needs existing improvement of manufacturing line, and be equipped with detection and control device, cost is higher.
In order to improve the finish rolling nose problem in hot-strip production, based on hot rolling production practices, consider the impact of belt steel thickness direction temperature contrast and reduction ratio, propose a kind of hot-strip nose control method, for improving the finish rolling nose problem in hot-strip production.
The finishing stands nose problem run in producing for hot-strip, the present invention is intended to propose a kind of control method by cooling condition and the setting of finish rolling rolling mill screwdown before improvement finish rolling de-scaling, to improve the nose problem in hot rolling production process, reduce the accident because nose causes and steel scrap.
Summary of the invention
Finish rolling nose problem in hot-strip production easily brings production accident and steel scrap, also can affect product quality, must be controlled.Herein based on hot rolling production practices, consider the impact of belt steel thickness direction temperature contrast and reduction ratio, propose a kind of hot-strip nose control method, concrete scheme is as follows:
A kind of hot-strip nose control method, is characterized in that, comprise the steps:
(1) the front lower water spray of finish rolling de-scaling is utilized to improve the temperature contrast in workpiece thickness direction,
Open the lower water spray before finish rolling de-scaling, to reduce band steel following table temperature, the nose reducing forebay occurs,
(2) rolling space-time crosses the frame between the F2 ~ F4 of upstream.
According to the present invention, (1) utilizes the front lower water spray of finish rolling de-scaling to improve thickness direction temperature contrast.Because the loss of band steel at high temperature heat is based on heat radiation, when intermediate blank is transmitted on roller-way, upper exterior heat radiation loss is greater than lower surface, easily causes intermediate blank underlaying surface temperature higher than upper surface, will cause in the operation of rolling, being with steel following table to extend and be greater than table, occur nose phenomenon.
In order to improve the nose problem because upper and lower temperature inequality causes, adopt the lower water spray before opening finish rolling de-scaling, as shown in Figure 4, to reduce band steel following table temperature, the nose reducing forebay occurs.
According to a kind of hot-strip nose control method of the present invention, it is characterized in that, open the lower water injection valve before finish rolling De-scaling box, for improving upper and lower temperature contrast, ensureing thickly to be less than 20 DEG C to the temperature difference.
According to a kind of hot-strip nose control method of the present invention, it is characterized in that, open the lower water injection valve before finish rolling De-scaling box, described lower water injection valve quantity 1 ~ 2 group.
According to a kind of hot-strip nose control method of the present invention, it is characterized in that, (2) rolling space-time to cross between the F2 ~ F4 of upstream a frame in 4.
According to a kind of hot-strip nose control method of the present invention, it is characterized in that, described workpiece thickness, namely finish rolling supplied materials thickness is 20 ~ 60mm, temperature 900 ~ 1100 DEG C.
According to the present invention, (2) rolling space-time crosses a frame between F2 ~ F4.
For some products, thickness is comparatively large (as pipeline steel strip steel, being greater than 10mm) usually, finishing stand load is less, generally can select the empty mistake of individual racks in production, namely this frame roll gap lifts and is not rolled, and so often can aggravate again the degree of band steel nose in frame.
Essence with steel nose is that strip steel head upper and lower surface in the operation of rolling extends uneven.Downstream frame is owing to being with steel thinner, and speed, once it is uneven that Deformation in thickness occurs, nose is often even more serious.For this reason, adopt sky to cross upstream stand herein, and select the frame between F2 ~ F4.Be illustrated in figure 5 the empty situation crossing F2.
According to the present invention, in hot-strip is produced, often there is the nose problem of band steel in finishing stand.Nose gently then causes downstream frame to nip difficulty, and downstream frame will be caused time serious to sting to enter and steel scrap.Therefore must be controlled.Herein based on hot rolling production practices, propose a kind of hot rolling nose control method, for improving hot rolling nose problem, good result is have received in certain hot rolling line practical application, if pipe line steel nose incidence was average 2.29% originally, almost do not occur again after enforcement, significantly improve nose problem.
Accompanying drawing explanation
Fig. 1 is hot-strip production technological process.
Schematic diagram produced by Fig. 2 hot-strip.
Fig. 3 hot-strip nose schematic diagram.
The cooling manifold schematic diagram of Fig. 4 every section.
Fig. 5 rolling sky crosses schematic diagram.
Detailed description of the invention
Embodiment one:
In order to investigate the validity proposing control method herein, to certain hot rolling pipeline product made from steel X52, its specification is 10.4 × 1200mm, finish rolling inlet thickness 48mm, finish rolling start rolling temperature 1000 DEG C, finishing temperature 850 DEG C.Adopt control method herein to produce, namely when hot rolling is produced, 1) open the lower water injection valve before finish rolling De-scaling box, improve upper and lower temperature homogeneity, 2) empty upstream F2 frame.
Table 1 is depicted as each frame drafts, and table 2 is depicted as employing new method, and a situation arises with the nose accident do not adopted under new method condition.
The each frame drafts of table 1
| Frame | F1 | F2 | F3 | F4 | F5 | F6 | F7 |
| Drafts/mm | 15.1 | 0.0 | 9.58 | 5.62 | 3.62 | 2.37 | 1.29 |
Nose contrast under table 2 aging method and new method
Embodiment two:
To certain hot-rolled product Q235, its specification is 12.7 × 1340mm, finish rolling inlet thickness 42mm, finish rolling start rolling temperature 1000 DEG C, finishing temperature 880 DEG C.Adopt control method herein to produce, namely when hot rolling is produced, 1) open the lower water injection valve before finish rolling De-scaling box, improve upper and lower temperature homogeneity, 2) empty upstream F3 frame.
Table 3 is depicted as each frame drafts, and table 4 is depicted as employing new method, and a situation arises with the nose accident do not adopted under new method condition.
The each frame drafts of table 3
| Frame | F1 | F2 | F3 | F4 | F5 | F6 | F7 |
| Drafts/mm | 12.2 | 6.5 | 0.0 | 4.1 | 3.2 | 2.1 | 1.2 |
Nose contrast under table 4 aging method and new method
Embodiment three:
To certain hot-rolled product X65, its specification is 11.7 × 1550mm, finish rolling inlet thickness 50mm, finish rolling start rolling temperature 980 DEG C, finishing temperature 830 DEG C.Adopt control method herein to produce, namely when hot rolling is produced, 1) open the lower water injection valve before finish rolling De-scaling box, improve upper and lower temperature homogeneity, 2) empty upstream F4 frame.
Table 5 is depicted as each frame drafts, and table 6 is depicted as employing new method, and a situation arises with the nose accident do not adopted under new method condition.
The each frame drafts of table 5
| Frame | F1 | F2 | F3 | F4 | F5 | F6 | F7 |
| Drafts/mm | 15.3 | 8.9 | 5.9 | 0.0 | 3.8 | 2.8 | 1.6 |
Nose contrast under table 6 aging method and new method
According to the present invention, adopt the lower water spray before opening finish rolling de-scaling to reduce band steel following table temperature, the nose reducing forebay occurs.This method can be used for improving the nose problem in hot-strip production, and popularizing application prospect is wide.
Claims (5)
1. a hot-strip nose control method, is characterized in that, comprises the steps:
(1) utilize the front lower water spray of finish rolling de-scaling to improve the temperature contrast in workpiece thickness direction, open the lower water spray before finish rolling de-scaling, to reduce band steel following table temperature, the nose reducing forebay occurs,
(2) rolling space-time crosses the frame between the F2 ~ F4 of upstream.
2. a kind of hot-strip nose control method as claimed in claim 1, is characterized in that, open the lower water injection valve before finish rolling De-scaling box, for improving upper and lower temperature contrast, ensures thickly to be less than 20 DEG C to the temperature difference.
3. a kind of hot-strip nose control method as claimed in claim 2, is characterized in that, open the lower water injection valve before finish rolling De-scaling box, described lower water injection valve quantity 1 ~ 2 group.
4. a kind of hot-strip nose control method as claimed in claim 1, is characterized in that, (2) rolling space-time to cross between the F2 ~ F4 of upstream a frame in 4.
5. a kind of hot-strip nose control method as claimed in claim 1, it is characterized in that, described workpiece thickness, namely finish rolling supplied materials thickness is 20 ~ 60mm, temperature 900 ~ 1100 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310390430.4A CN104415974A (en) | 2013-08-30 | 2013-08-30 | Finish rolling head-up control method of hot rolled strip production |
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| CN201310390430.4A CN104415974A (en) | 2013-08-30 | 2013-08-30 | Finish rolling head-up control method of hot rolled strip production |
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| CN104415974A true CN104415974A (en) | 2015-03-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108067507A (en) * | 2018-01-19 | 2018-05-25 | 山东钢铁集团日照有限公司 | A kind of control method of hot rolling variety steel roughing nose |
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| JPH08318303A (en) * | 1995-05-26 | 1996-12-03 | Kobe Steel Ltd | Method for controlling tip camber in hot rolling |
| EP1889671A1 (en) * | 2002-08-08 | 2008-02-20 | JFE Steel Corporation | Cooling apparatus for hot rolled steel strip, manufacturing method for hot rolled steel strip, and production line for hot rolled steel strip |
| CN202129280U (en) * | 2011-05-13 | 2012-02-01 | 鞍钢股份有限公司 | Device preventing warping of middle slab |
| KR20120020493A (en) * | 2010-08-30 | 2012-03-08 | 현대제철 주식회사 | Apparatus for preventing upward movement of material |
| CN102596440A (en) * | 2009-11-24 | 2012-07-18 | 住友金属工业株式会社 | Hot-rolled steel sheet manufacturing method, and hot-rolled steel sheet manufacturing device |
| CN202527486U (en) * | 2012-01-30 | 2012-11-14 | 首钢京唐钢铁联合有限责任公司 | Cooling device for hot rolling strip |
-
2013
- 2013-08-30 CN CN201310390430.4A patent/CN104415974A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08318303A (en) * | 1995-05-26 | 1996-12-03 | Kobe Steel Ltd | Method for controlling tip camber in hot rolling |
| EP1889671A1 (en) * | 2002-08-08 | 2008-02-20 | JFE Steel Corporation | Cooling apparatus for hot rolled steel strip, manufacturing method for hot rolled steel strip, and production line for hot rolled steel strip |
| CN102596440A (en) * | 2009-11-24 | 2012-07-18 | 住友金属工业株式会社 | Hot-rolled steel sheet manufacturing method, and hot-rolled steel sheet manufacturing device |
| KR20120020493A (en) * | 2010-08-30 | 2012-03-08 | 현대제철 주식회사 | Apparatus for preventing upward movement of material |
| CN202129280U (en) * | 2011-05-13 | 2012-02-01 | 鞍钢股份有限公司 | Device preventing warping of middle slab |
| CN202527486U (en) * | 2012-01-30 | 2012-11-14 | 首钢京唐钢铁联合有限责任公司 | Cooling device for hot rolling strip |
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| 所文升: "精轧机设备空过研究与应用", 《科技视界》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108067507A (en) * | 2018-01-19 | 2018-05-25 | 山东钢铁集团日照有限公司 | A kind of control method of hot rolling variety steel roughing nose |
| CN108067507B (en) * | 2018-01-19 | 2019-12-31 | 山东钢铁集团日照有限公司 | Control method for rough rolling warping of hot-rolled variety steel |
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Application publication date: 20150318 |