CN107096799B - Optimum roll shape design method suitable for six roller CVC skin pass mill group of single chassis - Google Patents
Optimum roll shape design method suitable for six roller CVC skin pass mill group of single chassis Download PDFInfo
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- CN107096799B CN107096799B CN201610096763.XA CN201610096763A CN107096799B CN 107096799 B CN107096799 B CN 107096799B CN 201610096763 A CN201610096763 A CN 201610096763A CN 107096799 B CN107096799 B CN 107096799B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
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Abstract
The present invention relates to a kind of optimum roll shape design methods suitable for six roller CVC skin pass mill group of single chassis, the optimum roll shape design method is to cross the plate shapes of all strips in product mix in weld seam and the normal operation of rolling all most preferably targets, optimum roll shape objective function is solved, obtains being suitable for the roll profile Optimal Curve that six roller CVC skin pass mill group of single chassis crosses weld seam and the normal operation of rolling.Product strip shape quality can be improved in optimum roll shape design of the invention, the roll design for solving current CVC skin pass mill group considers seldom for crossing weld seam process, the plate shape during weld seam was caused to fluctuate the problem of not being well controlled, directly affecting product strip shape quality.
Description
Technical field
The present invention relates to field of metallurgy more particularly to a kind of optimum roll shapes suitable for six roller CVC skin pass mill group of single chassis
Design method.
Background technique
The product quality for measuring strip has the big index of mechanical performance, plate shape, surface quality and dimensional accuracy etc. four, smooth
It is particularly important to the control of product quality as one of subsequent finishing skill in cold rolled sheet production.Smooth process passes through control
Strip elongation percentage can guarantee the product mechanical performance after returning goods, guarantee the type quality of product by control panel shape, go back simultaneously
Certain roughness can be formed in belt steel surface, improves the paintability and forming property of strip, therefore is directly influenced final
The grade of finished product positions.Therefore, the requirement with user to belt plate shape, surface quality etc. is continuously improved, smooth process
Importance it is increasingly prominent come out, the operating status of planisher farthest determines product lumber recovery, influences the warp of enterprise
Ji benefit.
In recent years, user proposes increasingly higher demands to production board shape and surface quality, and the roll shape of roll is straight
An important factor for influencing production board shape and surface quality is connect, therefore, roll design becomes more and more important.Six roller CVC of single chassis
When skin pass mill group carries out Rolling Production, it was segmented into weld seam and normally two processes of rolling, product is often normally rolling
When plate shape it is good, but when crossing weld seam rolling, occur going up and down and band property end to end due to crossing mill speed during weld seam
It can be the fluctuation of resistance of deformation, plate shape is caused to fluctuate.
The normal operation of rolling was concentrated mainly on for the design focus of roll shape in the past, for crossing some works of weld seam process
What skill feature considered be not it is very much, this had resulted in crossing the plate shape fluctuation during weld seam and be not well controlled, directly
Affect the strip shape quality of product.
Obviously, in order to improve product strip shape quality, how to design that take into account product in weld seam and the normal operation of rolling big
The optimum roll shape curve of all belt plate shapes has become the focus of site technology tackling key problem in guiding principle.
Summary of the invention
The object of the present invention is to provide a kind of optimum roll shape design method suitable for six roller CVC skin pass mill group of single chassis,
The optimum roll shape design method is all best with the plate shape for crossing all strips in product mix in weld seam and the normal operation of rolling
For target, designs and be suitable for the roll profile optimization song that six roller CVC skin pass mill group of single chassis crosses weld seam and the normal operation of rolling
Line improves product strip shape quality, and the roll design to solve current CVC skin pass mill group considers seldom for crossing weld seam process,
The plate shape during weld seam was caused to fluctuate the problem of not being well controlled, directly affecting product strip shape quality.
To achieve the above object, the scheme of the invention is: a kind of roll shape suitable for six roller CVC skin pass mill group of single chassis is excellent
Change design method, the optimum roll shape design method includes the following steps:
(1) the equipment characteristic parameter of six roller CVC skin pass mill group of single chassis is collected, and collects six roller of single chassis respectively
The parameter of CVC skin pass mill group ideal format steel grade strip in crossing weld seam process and the normal operation of rolling；
(2) working roll of the six roller CVC skin pass mill group of single chassis and the roller curve equation of CVC roller is set separately, and
Initial value is assigned to the roller curve equation；
(3) roller system elastic model is utilized, using segmentation discrete method, each specification steel grade strip is divided into m sections, and calculate separately
Strip crosses the forward pull distribution and the normally forward pull distribution in the operation of rolling during weld seam；
(4) optimum roll shape objective function is solved:
In formula, α was the plate shape weighting coefficient of weld seam and the normal operation of rolling, σ1ijTo cross forward pull point during weld seam
Cloth, σ '1ijIt is distributed for forward pull in the normal operation of rolling, i indicates i-th kind of ideal format steel grade, i=1,2,3 ... ..., n, j table
Show the jth section that strip is divided into, j=1,2,3 ... ..., m；
(5) judge whether Powell condition is true, if Powell condition is set up, export optimum roll camber parameter, go forward side by side
Enter step (6)；Otherwise initial value is assigned to roller curve equation according to step (2) again, and enters step (3)；
(6) according to the optimum roll camber parameter and the roller curve equation of the working roll and CVC roller, work is obtained
The optimum roll camber curve of roller and CVC roller completes the optimum roll shape design of six roller CVC skin pass mill group of single chassis.
Further, the optimum roll shape design side according to the present invention suitable for six roller CVC skin pass mill group of single chassis
Method, in the step (1), the equipment characteristic parameter of six roller CVC skin pass mill group of single chassis includes: working roll green diameter, work
Make roller barrel length, working roll bearing block center is away from, CVC roller green diameter, CVC roller barrel length, CVC roll bearing seat center
Away from maximum rolling force and maximum mill speed.
Further, the optimum roll shape design side according to the present invention suitable for six roller CVC skin pass mill group of single chassis
Method, in the step (1), the parameter of strip includes: steel grade, mark of tapping, strip width bi, steel strip thickness hi, elongation percentage
εi, yield limit σi, rolling force setup value Pi, backward pull setting value T0i, forward pull setting value T1i, wherein i indicates i-th kind of typical case
Specification steel grade, i=1,2 ..., n.
Further, the optimum roll shape design side according to the present invention suitable for six roller CVC skin pass mill group of single chassis
Method, in the step (2), the roller curve equation of working roll are as follows:
Dw(x)=Dw-a{1-cos[bπ(2x/Lw)]
The roller curve equation of CVC roller are as follows:
Dm(x)=Dm+a1x-a2x2+a3x3
Wherein, a, b are characterized coefficient, a1For CVC roller roller curve Monomial coefficient, a2For CVC roller roller curve quadratic term
Coefficient, a3For CVC roller roller curve term coefficient three times, DmFor CVC roller green diameter, DwFor working roll green diameter, LwFor work
Roller barrel length.
It is that the present invention reaches the utility model has the advantages that optimum roll shape design method of the invention is produced with crossing weld seam and the normal operation of rolling
The plate shape of all strips all most preferably targets in product outline, design be suitable for six roller CVC skin pass mill group of single chassis cross weld seam and
The roll profile Optimal Curve of the normal operation of rolling, substantially increases product strip shape quality, brings biggish economic effect to enterprise
Benefit.
Detailed description of the invention
Fig. 1 is optimum roll shape design cycle schematic diagram of the present invention；
Fig. 2 is the working roll optimum roll camber curve of the embodiment of the present invention；
Fig. 3 is the CVC roller optimum roll camber curve of the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with specific embodiment with reference to the accompanying drawing.
The present invention is on the basis of the tracking of a large amount of field test is with theoretical research, it is contemplated that six roller CVC of single chassis is smooth
Unit crosses the equipment and technology feature in weld seam and the normal operation of rolling, and spy proposes a kind of flat suitable for six roller CVC of single chassis
The optimum roll shape design method of complete machine group, specific design process are as follows:
(a) the equipment characteristic parameter of six roller CVC skin pass mill group of single chassis is collected, the equipment characteristic parameter includes: work
Roller green diameter Dw, working roll barrel length Lw, working roll bearing block center is away from Lfw, CVC roller green diameter Dm, the CVC roller body of roll is long
Spend Lm, CVC roll bearing seat center is away from Lfm, maximum rolling force PmaxWith maximum mill speed vmax；
(b) weld seam process and the normal operation of rolling, the strip parameter of ideal format steel grade were collected respectively, comprising: steel grade,
Tapping mark, strip width bi, strip width hi, elongation percentage εi, yield limit σi, rolling force setup value Pi, backward pull setting value
T0iWith forward pull setting value T1i, wherein i=1,2 ..., n, i indicate that i-th kind of ideal format steel grade, n are that ideal format steel grade is total
Quantity；
(c) with a, b, a1,a2,a3For roller curve parameter, the roller curve equation of working roll Yu CVC roller is set separately,
In, working roll set roller curve equation as
Dw(x)=Dw-a{1-cos[bπ(2x/Lw)]
CVC roller set roller curve equation as
Dm(x)=Dm+a1x-a2x2+a3x3
In formula, a, b are characterized coefficient, a1For CVC roller roller curve Monomial coefficient, a2For CVC roller roller curve quadratic term
Coefficient, a3For intermediate calender rolls roller curve term coefficient three times, DmFor CVC roller green diameter, DwFor working roll green diameter, LwFor work
Make roller barrel length.
(d) initial roller curve parameter is given；
(e) roller system elastic model is utilized, using segmentation discrete method, each specification steel grade strip is divided into m sections, calculates separately band
Steel crosses the forward pull distribution σ during weld seam1ijAnd the forward pull in the normal operation of rolling is distributed σ '1ij, wherein i indicates i-th kind
Ideal format steel grade, i=1,2,3 ... ..., n, j indicate the jth section that strip is divided into, j=1,2,3 ... ..., m；
(f) optimum roll shape objective function is solved:
α was the plate shape weighting coefficient of weld seam and the normal operation of rolling, σ in formula1ijTo cross forward pull point during weld seam
Cloth, σ '1ijIt is distributed for forward pull in the normal operation of rolling；
(g) judge whether Powell condition is true, if Powell condition is set up, export optimum roll camber parameter, go forward side by side
Enter step (h)；Otherwise initial value is assigned to roller curve equation again, gives initial roller curve parameter, and enter step (e)；
(h) the roller curve equation that optimum roll camber parameter is substituted into working roll and CVC roller, obtains working roll and CVC roller
Optimum roll camber curve completes the optimum roll shape design of six roller CVC skin pass mill group of single chassis.
Embodiment:
In order to illustrate the application process of the relevant technologies of the present invention, now by taking certain six roller CVC skin pass mill group of single chassis as an example,
The optimum roll shape design process of certain six roller CVC skin pass mill group of single chassis is introduced in detail:
(a) the equipment characteristic parameter of six roller CVC skin pass mill group of single chassis is collected, comprising: working roll green diameter Dw=
520mm, working roll barrel length Lw=1730mm, working roll bearing block center is away from Lfw=2730mm, CVC roller green diameter Dm=
620mm, CVC roller barrel length Lm=1930mm, CVC roll bearing seat center are away from Lfm=2730mm, maximum rolling force Pmax=
13000KN, maximum mill speed vmax=760m/min；
(b) product parameters of weld seam and normal operation of rolling ideal format steel grade were collected respectively, comprising: steel grade, tapping
Mark, strip width bi, steel strip thickness hi, elongation percentage εi, yield limit σi, mill speed vi, roll-force Pi, backward pull T0i, preceding
Tension T1i, wherein i=1,2 ..., n, product specification quantity n=6, design parameter are as shown in Table 1 and Table 2；
Table 1 crosses the strip parameter of weld seam process ideal format steel grade
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 |
| Steel grade | CR180B2 | DC01 | SPCC | SPCC | CR180B0 | CR210B2 |
| Tapping mark | DU3852D1 | AP0961E1 | AP0941D1 | AP1055E5 | DP0162D1 | DT3855D1 |
| Width/mm | 1270 | 1372 | 927 | 1260 | 1013 | 902 |
| Thickness/mm | 0.7 | 0.5 | 1.17 | 2.3 | 2 | 0.65 |
| Elongation percentage/% | 0.25 | 0.16 | 0.21 | 0.27 | 0.31 | 0.3 |
| Yield limit/MPa | 170 | 230 | 260 | 260 | 260 | 375 |
| Mill speed/m/min | 60 | 60 | 60 | 60 | 60 | 60 |
| Roll-force/KN | 930 | 930 | 980 | 1000 | 900 | 840 |
| Backward pull/KN | 55.58 | 54.3 | 65.24 | 61.5 | 50.46 | 40.58 |
| Forward pull/KN | 56.26 | 55.3 | 66.11 | 62.63 | 51.75 | 41.37 |
The strip parameter of the normal operation of rolling ideal format steel grade of table 2
| Serial number | 1 | 2 | 3 | 4 | 5 | 6 |
| Steel grade | CR180B2 | DC01 | SPCC | SPCC | CR180B0 | CR210B2 |
| Tapping mark | DU3852D1 | AP0961E1 | AP0941D1 | AP1055E5 | DP0162D1 | DT3855D1 |
| Width/mm | 1270 | 1372 | 927 | 1260 | 1013 | 902 |
| Thickness/mm | 0.7 | 0.5 | 1.17 | 2.3 | 2 | 0.65 |
| Elongation percentage/% | 1.29 | 0.99 | 0.89 | 1.07 | 1.30 | 1.47 |
| Yield limit/MPa | 170 | 230 | 260 | 260 | 260 | 375 |
| Mill speed/m/min | 500 | 500 | 500 | 500 | 500 | 500 |
| Roll-force/KN | 6260 | 5350 | 5170 | 5980 | 6540 | 7460 |
| Backward pull/KN | 54.21 | 53.12 | 64.08 | 60.34 | 49.33 | 39.35 |
| Forward pull/KN | 55.18 | 54.09 | 65.13 | 61.42 | 50.57 | 40.28 |
(c) with a, b, a1,a2,a3For roller curve parameter, the roller curve equation of working roll Yu CVC roller is set separately,
In, working roll set roller curve equation as
Dw(x)=Dw-a{1-cos[bπ(2x/Lw)]
CVC roller set roller curve equation as
Dm(x)=Dm+a1x-a2x2+a3x3
(d) initial roller curve parameter is given
X0={ a, b, a1,a2,a3}={ 1 × 10-4,5×10-2,3.5×10-3,3.7×10-6,1.2×10-9}
(e) i=1 is enabled；
(f) roller system elastic model is utilized, using segmentation discrete method, band is divided into m sections, calculates forward pull distribution paragraph by paragraph,
Forward pull is distributed σ during weld seam is obtained1ijσ ' is distributed with forward pull in the normal operation of rolling1ij, it is as follows:
Forward pull is distributed σ during crossing weld seam11j=63.28,66.45,69.77,73.26,76.92,80.77,
84.81,89.05,93.50,98.18,103.08,98.18,93.50,89.05,84.81,80.77,76.92,73.26,
69.77,66.45,63.28 }, units MPa；
Forward pull is distributed σ ' in the normal operation of rolling11j=62.07,65.17,68.43,71.85,75.45,79.22,
83.18,87.34,91.71,96.29,101.11,96.29,91.71,87.34,83.18,79.22,75.45,71.85,
68.43,65.17,62.07 }, units MPa；
(g) do you judge whether i < n true? if set up, i=i+1 is transferred to step (f), is otherwise transferred to step (h)；
(h) optimum roll shape objective function is solved:
α was the plate shape weighting coefficient of weld seam and the normal operation of rolling in formula, according to practical α=0.45 in scene；
(i) do you judge whether Powell condition true? if Powell condition is set up, it is transferred to step (j), is otherwise transferred to step
Suddenly (d)；
(j) optimum roll camber parameter is exported
X={ a, b, a1,a2,a3}={ 2.78 × 10-4,7.69×10-2,3.516×10-3,3.718×10-6,1.1634
×10-9}
(k) by optimum roll camber parameter
X={ a, b, a1,a2,a3}={ 2.78 × 10-4,7.69×10-2,3.516×10-3,3.718×10-6,1.1634
×10-9Substitute into working roll and CVC roller roller curve equation, obtain the optimum roll camber curvilinear equation of working roll:
Dw(x)=Dw-2.78×10-4{1-cos[7.69×10-2π(2x/Lw)]
The optimum roll camber curvilinear equation of CVC roller:
Dm(x)=Dm+0.3516×10-2x-0.3718×10-5x2+1.1634×10-9x3
Working roll optimum roll camber curve is as shown in Fig. 2, CVC roller optimum roll camber curve is as shown in Figure 3.
The present invention to cross the plate shapes of all strips in product mix in weld seam and the normal operation of rolling all most preferably targets, if
It counts out and is suitable for the roll profile Optimal Curve that six roller CVC skin pass mill group of single chassis crosses weld seam and the normal operation of rolling, the technology
After being used by certain six roller CVC skin pass mill group of single chassis, product strip shape quality is substantially increased, brings biggish warp to enterprise
Ji benefit.
Claims (4)
1. a kind of optimum roll shape design method suitable for six roller CVC skin pass mill group of single chassis, it is characterised in that: the roll shape
Optimum design method includes the following steps:
(1) the equipment characteristic parameter of six roller CVC skin pass mill group of single chassis is collected, and it is flat to collect the six roller CVC of single chassis respectively
The parameter of complete machine group ideal format steel grade strip in crossing weld seam process and the normal operation of rolling；
(2) working roll of the six roller CVC skin pass mill group of single chassis and the roller curve equation of CVC roller is set separately, and to institute
The roller curve equation stated assigns initial value；
(3) roller system elastic model is utilized, using segmentation discrete method, each specification steel grade strip is divided into m sections, and calculate separately strip
Cross the forward pull distribution and the normally forward pull distribution in the operation of rolling during weld seam；
(4) optimum roll shape objective function is solved:
In formula, α was the plate shape weighting coefficient of weld seam and the normal operation of rolling, σ1ijIt is distributed to cross forward pull during weld seam,
σ'1ijIt is distributed for forward pull in the normal operation of rolling, i indicates that i-th kind of ideal format steel grade, i=1,2,3 ... ..., n, j indicate band
The jth section that steel is divided into, j=1,2,3 ... ..., m；
(5) judge whether Powell condition is true, if Powell condition is set up, export optimum roll camber parameter, and enter step
Suddenly (6)；Otherwise initial value is assigned to roller curve equation according to step (2) again, and enters step (3)；
(6) according to the optimum roll camber parameter and the roller curve equation of the working roll and CVC roller, obtain working roll with
The optimum roll camber curve of CVC roller completes the optimum roll shape design of six roller CVC skin pass mill group of single chassis.
2. the optimum roll shape design method according to claim 1 suitable for six roller CVC skin pass mill group of single chassis, feature
It is, in the step (1), the equipment characteristic parameter of six roller CVC skin pass mill group of single chassis includes: working roll green diameter,
Working roll barrel length, working roll bearing block center is away from, CVC roller green diameter, CVC roller barrel length, CVC roll bearing seat center
Away from maximum rolling force and maximum mill speed.
3. the optimum roll shape design method according to claim 1 suitable for six roller CVC skin pass mill group of single chassis, feature
It is, in the step (1), the parameter of strip includes: steel grade, mark of tapping, strip width bi, steel strip thickness hi, elongation percentage
εi, yield limit σi, rolling force setup value Pi, backward pull setting value T0i, forward pull setting value T1i, wherein i indicates i-th kind of typical case
Specification steel grade, i=1,2 ..., n.
4. the optimum roll shape design method according to claim 1 suitable for six roller CVC skin pass mill group of single chassis, feature
It is, in the step (2), the roller curve equation of working roll are as follows:
Dw(x)=Dw-a{1-cos[bπ(2x/Lw)]
The roller curve equation of CVC roller are as follows:
Dm(x)=Dm+a1x-a2x2+a3x3
Wherein, a, b are characterized coefficient, a1For CVC roller roller curve Monomial coefficient, a2For the secondary term system of CVC roller roller curve
Number, a3For CVC roller roller curve term coefficient three times, DmFor CVC roller green diameter, DwFor working roll green diameter, LwFor working roll
Barrel length.
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| JPS63101010A (en) * | 1986-10-15 | 1988-05-06 | Sumitomo Metal Ind Ltd | Four high mill |
| JPH0377703A (en) * | 1989-08-15 | 1991-04-03 | Sumitomo Metal Ind Ltd | Highest hertz's pressure reducing device of hot rolling time |
| CN100391633C (en) * | 2005-08-30 | 2008-06-04 | 宝山钢铁股份有限公司 | Heat zincplating planisher roll shape curve design method |
| CN101477579B (en) * | 2008-01-04 | 2011-06-15 | 宝山钢铁股份有限公司 | Roll-shaped curve design method of high-strength steel temper mill |
| CN101486042A (en) * | 2008-01-18 | 2009-07-22 | 上海梅山钢铁股份有限公司 | Roll shape configuration method for whole-set precision rolling working roll |
| CN101559437B (en) * | 2009-05-20 | 2012-01-04 | 燕山大学 | Roll shape curve design method for 4-high tandem cold rolling mill by taking complex wave control as target |
| CN102172629B (en) * | 2011-01-29 | 2012-07-25 | 首钢总公司 | Roll profile control method for CVC-6 leveling machine set |
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