CN207628884U - Improve the plate shape of hot-strip and the finishing mill device of cold rolling coil local protuberance defect - Google Patents
Improve the plate shape of hot-strip and the finishing mill device of cold rolling coil local protuberance defect Download PDFInfo
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- CN207628884U CN207628884U CN201721648529.XU CN201721648529U CN207628884U CN 207628884 U CN207628884 U CN 207628884U CN 201721648529 U CN201721648529 U CN 201721648529U CN 207628884 U CN207628884 U CN 207628884U
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Abstract
The utility model discloses a kind of finishing mill devices for the plate shape and cold rolling coil local protuberance defect improving hot-strip, including the tandem mill rack being arranged in order, each rack is equipped with working roll, the working roll is curve roller, i.e. work roll surface contour line is the symmetrical curve of line centered on the body of roll, and the working roll of optimization is the particular curve roll shape of indent in the middle part of the body of roll；Steel edge portion local high spot value is reduced, while taking into account the good problem of plate shape, improves qualification rate of hot-strip during cold rolling, it can be on the basis of existing equipment, its mm finishing mill unit is improved, it is not necessary to which excessive investment achieves that, and does not influence original technological process of production.
Description
Technical field
The utility model is related to prick steel equipment technical field, and in particular to a kind of plate shape and cold rolling coil improving hot-strip
The finishing mill device of local protuberance defect.
Background technology
Coil of strip local protuberance defect refers to that reasons make strip in curly course by belt plate shape or section configuration be bad etc.
In successively add up and coil of strip surface formed the micro protrusion phenomenon in part, after uncoiling again often result in strip add local wave
Shape has seriously affected strip appearance surfaces quality and product mechanical performance, product is caused to degrade, and serious economy is caused to enterprise
Loss.Experience have shown that cold-rolled steel coils local protuberance defect is mainly caused by strip section local high spot, and the section of cold-strip steel
Shape central genetic is in the section configuration of hot-strip.Therefore, it is to administer cold-rolled steel coils that seeking, which improves hot-strip section configuration,
The key of local protuberance defect；In addition, hot-strip section configuration and the belt plate shape in course of hot rolling are in close relations, solving
Also the plate shape problem of hot-strip is preferably improved while cold-rolled steel coils local protuberance defect.
Invention content
The technical problems to be solved in the utility model is in view of the foregoing defects the prior art has, to provide kind of an improvement
The plate shape of hot-strip and the finishing mill device of cold rolling coil local protuberance defect reduce steel edge portion local high spot value, while simultaneous
The good problem of plate shape is cared for, qualification rate of hot-strip during cold rolling is improved, it can be on the basis of existing equipment, to it
Mm finishing mill unit is improved, it is not necessary to which excessive investment achieves that, and does not influence original technological process of production.
Used technical solution is the utility model to solve above-mentioned technical problem：
A kind of finishing mill device for the plate shape and cold rolling coil local protuberance defect improving hot-strip, including be arranged in order
Tandem mill rack, each rack are equipped with working roll, and working roll is divided into top working roll and bottom working roll, and the working roll is curve
Roller, i.e. work roll surface contour line are the symmetrical curve of line centered on the body of roll；
The outer surface curve of working roll is determined by following formula：
In formulaFor working roll nominal diameter, lwFor working roll barrel length, α is cosine function cornerite variable, and b is optimization
Roll design variable；Its purpose is to improve crown of strip, steel edge portion local high spot value is reduced, meanwhile, take into account plate
The good problem of shape achievees the purpose that improve plate shape by the target strip crown reasonable distribution of each rack.
Above-mentioned technical proposal is connect, working roller optimization object function is：
H in formula6ij、h4ij、h2ijRespectively under the conditions of benchmark bending roller force strip away from edge 40mm, the wide place of 1/5 plate and 1/
The thickness value at the wide place of 2 plates, AijFor crown of strip control coefrficient, PCijFor strip target proportion convexity, hijFor rack outlet
Strip average thickness, k1、k2For each target weighting coefficient；Optimize when calculating with the strip crown of last rack outlet rolled piece as constraint item
Part, i.e. 20 μm≤C40≤55μm；Ew(x) be working roll optimization after roller curve, it be consider contact pressure between rolls distribution,
Improve the abrasion of roller edge, improves the optimization design of roll working life.
Above-mentioned technical proposal is connect, backing roll is additionally provided in each rack, backing roll is divided into top backing up roll and lower support roll, bearing
Roller roller curve (backing roll roller curve is the roller shoulders surface profile line of backing roll) is determined using such as lower curve：δγ
=δ0(z/lz)α, δ in formula0For optimum roll shape target it needs to be determined that sloping shoulders height, lzFor optimum roll shape target it needs to be determined that cut
Shoulder length degree, α are the power amount of roller curve optimization aim；Its purpose is to reduce the pressure between roller end contact, even roller
Harmful contact area, reduction other than power distribution, elimination plate are wide are harmful to contact pressure between rolls and uniform toe-out stress distribution, to carry
The service life of high backing roll.According to the rolling scaduled corresponding regulation of the typical case of the backing roll roll shape of onsite application and offer, into
Row simulation calculates analysis, is optimized to the shoulder roller curve of backing roll.
Above-mentioned technical proposal is connect, backing roll optimum roll shape object function is：
Q in formulamaxThe contact stress maximum value between roller,The contact stress average value between roller；
Eb(x) be backing roll optimization after roller curve, it be consider contact pressure between rolls distribution, improve roller edge abrasion, carry
The optimization design of high roll working life.
Above-mentioned technical proposal is connect, the top working roll and bottom working roll use identical curve roller, top backing up roll and lower branch
Runner uses identical roller shoulder curve.
The utility model has the advantages that：
1. improving crown of strip by improved working roll, steel edge portion local high spot value is reduced, meanwhile, it takes into account
The good problem of plate shape achievees the purpose that improve plate shape, improves cold rolling commodity by the target strip crown reasonable distribution of each rack
The problem of rolling up local protuberance defect improves qualification rate of hot-strip during cold rolling, can be on the basis of existing equipment
On, its mm finishing mill unit is improved, it is not necessary to which excessive investment achieves that, and does not influence original technological process of production.
2. by backing roll after optimization reduce pressure distribution between roller end contact, even roller, eliminate plate it is wide other than
Harmful contact area, reduce and be harmful to contact pressure between rolls and uniform toe-out stress distribution, to improve the service life of backing roll.
According to the rolling scaduled corresponding regulation of the typical case of the backing roll roll shape of onsite application and offer, carries out simulation and calculate analysis, to branch
The shoulder roller curve of runner optimizes.
Description of the drawings
Fig. 1 is working roller curve schematic diagram in the utility model embodiment；
Fig. 2 is that working roller optimizes calculation flow chart in the utility model embodiment；
Fig. 3 is backing roll roller curve schematic diagram in the utility model embodiment；
Fig. 4 is backing roll optimum roll shape calculation flow chart in the utility model embodiment；
Specific implementation mode
The utility model is described in detail with reference to the accompanying drawings and examples.
Shown in referring to Fig.1~Fig. 4, improve plate shape and the cold rolling of hot-strip in a kind of embodiment provided by the utility model
Roll up the finishing mill device of local protuberance defect, including the mm finishing mill unit that is arranged in order, each rack be respectively provided with upper and lower working roll and
Upper and lower backing roll, to improve middle width strip hot rolled plate shape and the problem of cold rolling commercial coil local protuberance defect, the present invention is first to work
To make roller body of roll curve and design is optimized, the working roll of optimization is the particular curve roll shape of indent in the middle part of the body of roll, the purpose is to
In order to improve crown of strip, steel edge portion local high spot value is reduced, meanwhile, the good problem of plate shape is taken into account, each rack is passed through
Target strip crown reasonable distribution, achieve the purpose that improve plate shape.
Referring to Fig. 1, work roll surface contour line is with the symmetrical curve of body of roll center line, and the curve is true by following formula
It is fixed：
In formulaFor working roll nominal diameter, lwFor working roll barrel length, α is cosine function cornerite variable, and b is excellent
Change roll design variable.
After working roller curve design, it need to be optimized.Referring to Fig. 2, optimize calculation process for working roller
Figure, first by the iterative solution of metal plastic deformation model and roll elastic deformation model, calculates in certain roll shape condition
Under section configuration and plate shape further according to the requirement of optimum roll shape target, optimization is then obtained using Powell direct search methods
Variable solution, to complete optimum roll shape.
Working roller optimization object function is
H in formula6ij、h4ij、h2ijOn the basis of respectively under the conditions of bending roller force, strip is away from the wide place of plate of edge 40mm, 1/5 and 1/2
Thickness value, AijFor crown of strip control coefrficient, PCijFor strip target proportion convexity, hijFor the average thickness of rack outlet strip
Degree, k1、k2For each target weighting coefficient；Ew(x) be working roll optimization after roller curve, it is to consider contact pressure between rolls
Distribution improves the abrasion of roller edge, improves the optimization design of roll working life.
Each rack is required for determining the optimized variable of the rack according to optimization aim.Optimization is gone out when calculating with last rack
The strip crown of mouth rolled piece is constraints, i.e. 20 μm≤C40≤55μm。
After working roller determines, the roll shape further to backing roll is needed to be designed.Its purpose is to reduce roller
Terminate touch pressure, the pressure distribution between even roller, eliminate plate it is wide other than harmful contact area, reduce be harmful to contact pressure between rolls and
Uniform toe-out stress distribution, to improve the service life of backing roll.According to the backing roll roll shape of onsite application and the allusion quotation of offer
The rolling scaduled corresponding regulation of type carries out simulation and calculates analysis, optimized to the shoulder roller curve of backing roll.
It is backing roll roller curve referring to Fig. 3, the curve is determined by following formula：
δγ=δ0(z/lz)α
δ in formula0For optimum roll shape target it needs to be determined that sloping shoulders height, lzFor optimum roll shape target it needs to be determined that sloping shoulders
Length, α are the power amount of roller curve optimization aim.
Backing roll is essentially the same with the principle of working roller optimization design, referring to Fig. 4, first according to the material of offer,
The data such as specification and its corresponding rolling procedure select the typical products specification of optimum roll shape design, pass through plastic deformation
Distorted pattern and the iterative solution of roll elastic deformation model, calculate the roll gap pressure and forward pull under the conditions of ground state bending roller force
Distribution, then, further according to the requirement of optimum roll shape target, optimized variable solution is obtained using Powell direct search methods, to complete
At optimum roll shape.
Backing roll optimum roll shape object function is
Q in formulamaxThe contact stress maximum value between roller,The contact stress average value between roller；Eb(x) it is after backing roll optimizes
Roller curve, it be consider contact pressure between rolls distribution, improve roller edge abrasion, improve the optimization of roll working life
Design.
The processing of the roller curve of above-mentioned working roll and backing roll is all accurately processed on numerically control grinder.Work
It requires to ensure enough cooling times before roller grinding, eliminating remaining Thermal Profile influences so that roll shape reflection after grinding is true
Upper machine roll shape situation.After above-mentioned roll shape, in conjunction with certain bending roller force, reasonable controlled rolling milimeter number adjusts rolling procedure,
It is rolled under the conditions of essentially identical rolling mill practice, you can satisfactory hot-strip is shut out, such hot rolling production
Cold rolling commercial coil can improve the problem of local protuberance defect.
1 embodiment presented below
Certain hot rolling middle width strip production line, mm finishing mill unit are 7 frame tandem mill group F1~F7, design parameter such as following table：
1 hot rolling F1~F7 roller system of rolling mill parameters of table
Second of the experiment carried out on the production line, working roller parameter are shown in Table 2.Since each rack is required for root
According to optimization aim, respective optimized variable is designed, but to simplify the management of grinding roller technique, the working roll of 7 racks is optimized and is become
Amount is divided into 5 groups, i.e. F1~F2 points are one group, and F3~F4 points are one group, and F5, F6, F7 are respectively one group.
Each rack working roller parameter of 2 hot rolling of table
Backing roll shoulder Die parameter is shown in Table 3：
3 backing roll shoulder Die parameter of table
The total rolled band steel volume 92 (milimeter number reaches 38 kilometers or so) of this time experiment, wherein 3.00mm cold rollings material volume 74.It takes out
The band plate crown and shim values of survey are as shown in table 4.
4 strip crown of table and shim values
Machine is tested on this, and band plate crown controls in desired extent substantially, and belt plate shape situation without exception, shape wave lacks
It falls into and is in controllable state.Wherein cold rolling commercial coil examines snare drum descending series volume 1 after cold rolling.
In conclusion the working roll of each rack is all made of the form of curve roller, the backing roll of each rack uses roller shoulder curve
The form of transition after improvement, the problem of preferably improving cold rolling commercial coil local protuberance defect, shows the skill through test of many times
Art reasonable design, easy operation is to solve the problems, such as directly effective means, improves conjunction of hot-strip during cold rolling
Lattice rate.The present invention can be improved its mm finishing mill unit on the basis of existing equipment, it is not necessary to and excessively investment achieves that, and
Original technological process of production is not influenced.
Above is only the preferred embodiment of the utility model, cannot limit the power of the utility model with this certainly
Sharp range, therefore equivalence changes made according to the patent scope of the utility model, still belong to the scope of protection of the utility model.
Claims (4)
1. a kind of finishing mill device for the plate shape and cold rolling coil local protuberance defect improving hot-strip, including the company that is arranged in order
Rolling-mill housing, each rack are equipped with working roll, which is characterized in that the working roll is curve roller, i.e. work roll surface contour line
For the symmetrical curve of the line centered on the body of roll；
The outer surface curve of working roll is determined by following formula：
In formulaFor working roll nominal diameter, lwFor working roll barrel length, α is cosine function cornerite variable, and b is optimization roll shape
Design variable.
2. the finishing mill device of the plate shape and cold rolling coil local protuberance defect according to claim 1 for improving hot-strip,
It is characterized in that, working roller optimization object function is：
H in formula6ij、h4ij、h2ijRespectively under the conditions of benchmark bending roller force strip away from edge 40mm, the wide place of 1/5 plate and 1/2 plate
Thickness value at width, AijFor crown of strip control coefrficient, PCijFor strip target proportion convexity, hijFor rack outlet strip
Average thickness, k1、k2For each target weighting coefficient.
3. the finishing mill device of the plate shape and cold rolling coil local protuberance defect according to claim 1 for improving hot-strip,
It is characterized in that, being additionally provided with backing roll in each rack, backing roll roller curve is determined using such as lower curve：δγ=δ0(z/lz)α,
δ in formula0For optimum roll shape target it needs to be determined that sloping shoulders height, lzFor optimum roll shape target it needs to be determined that sloping shoulders length, α is
The power amount of roller curve optimization aim.
4. the finishing mill device of the plate shape and cold rolling coil local protuberance defect according to claim 3 for improving hot-strip,
It is characterized in that, backing roll optimum roll shape object function is：
Q in formulamaxThe contact stress maximum value between roller,The contact stress average value between roller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721648529.XU CN207628884U (en) | 2017-11-30 | 2017-11-30 | Improve the plate shape of hot-strip and the finishing mill device of cold rolling coil local protuberance defect |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721648529.XU CN207628884U (en) | 2017-11-30 | 2017-11-30 | Improve the plate shape of hot-strip and the finishing mill device of cold rolling coil local protuberance defect |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022057925A1 (en) * | 2020-09-18 | 2022-03-24 | Jiangsu Shagang Group Co., Ltd. | Improving surface quality of twin roll cast and hot rolled thin strip steel |
| CN115971258A (en) * | 2023-03-20 | 2023-04-18 | 山西建龙实业有限公司 | Control method for strip shape and plate convexity of narrow strip steel hot continuous rolling mill |
-
2017
- 2017-11-30 CN CN201721648529.XU patent/CN207628884U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022057925A1 (en) * | 2020-09-18 | 2022-03-24 | Jiangsu Shagang Group Co., Ltd. | Improving surface quality of twin roll cast and hot rolled thin strip steel |
| CN115971258A (en) * | 2023-03-20 | 2023-04-18 | 山西建龙实业有限公司 | Control method for strip shape and plate convexity of narrow strip steel hot continuous rolling mill |
| CN115971258B (en) * | 2023-03-20 | 2023-05-16 | 山西建龙实业有限公司 | Control method for strip shape and convexity of hot continuous strip mill |
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