CN103084408A - Strip steel surface roughness control method suitable for double-stand temper mill set - Google Patents

Abstract

A strip steel surface roughness control method suitable for a double-stand temper mill set mainly comprises the following steps which are executed by a computer: first, collecting the device characteristic parameters of the double-stand temper mill set, the strip key rolling technological parameter of a to-be-comprehensively-set metal pattern diameter and the strip key quality parameter of the to-be-comprehensively-set metal pattern diameter; second, calculating the percentage elongation under current roll force and front and back tensile stress and the distribution of outlet tensile stress; calculating the roughness of outlet strip steel of a first machine frame, calculating the roughness of outlet strip steel of a second machine frame, and calculating the roughness to control an objective function; and fourth, setting optimum first roll force and optimum second roll force, and completing setting of the roll force by adjusting the position of a piston. The strip steel surface roughness control method suitable for the double-stand temper mill set avoids the problems that the double-stand temper mill set is singularly controlled and considering is not comprehensive, avoids bad surface roughness of the strip steel, and has important guiding significance to site production.

Description

A kind of belt steel surface roughness control method that is applicable to the Two-stand Temper Mill group

Technical field

The present invention relates to the skin pass rolling technology, particularly a kind of belt steel surface roughness control method that is applicable to the Two-stand Temper Mill group.

Background technology

Surface roughness is as one of key character of smooth finished strip, and it not only has influence on deformational behavior when pressing with steel drift and the outward appearance looks after coating, and can change the corrosion resistance of material.From present Quality Developing trend, the roughness of belt steel surface is controlled has become important quality index, especially most important to Automobile Plate.How to set up planisher plate surface roughness forecasting model, the belt steel surface roughness value that produce is forecast, finally reach prior adjustment, avoid roughness overproof, become the Focal point and difficult point of site technology tackling key problem.For the Two-stand Temper Mill group, outlet comprises 1# frame working roll roughness, 2# frame working roll roughness, supplied materials roughness, 1# roll-force, 2# roll-force with the control parameter of steel roughness.In the production process of Two-stand Temper Mill group, often only 1# frame working roll roughness, 2# frame working roll roughness were set in the past, do not considered the impact of roll-force.And in fact, roll-force is obvious with the roughness impact of steel on outlet, and especially very large to the working roll roughness difference of this two frames Two-stand Temper Mill group affects very important especially.

(list of references: [1] Bai Zhenhua, Liu Hongmin, Li Xiujun, Deng. skin pass rolling process modeling [M]. Beijing: metallurgical industry publishing house, 2010:1-100.[2] Zhou Qingtian, Bai Zhenhua, Wang Junfei. the research of Strip Surface Roughness Model about Tandem Cold Mill and application thereof [J]. China Mechanical Engineering, 2007,18 (14): 1743-1746.[3] Bai Zhenhua, Kang Xiaopeng, Long Ruibing, Deng. Practical skin pass rolling pressure model and self study technical research [J] thereof. iron and steel, 2008,43 (10): 51-54.)

Summary of the invention

The object of the present invention is to provide and a kind ofly can avoid the overproof belt steel surface roughness control method that is applicable to the Two-stand Temper Mill group of belt steel surface roughness.The present invention is mainly as object function outlet band roughness, breaking elongation, plate shape are satisfied contract requirement as constraints, by the distribution to two frame roll-forces, at utmost expand the scope of the outlet belt steel surface roughness of Two-stand Temper Mill group.

Technical scheme of the present invention is as follows:

A kind of band steel roughness control method that is suitable for the Two-stand Temper Mill group comprises the following step that can be carried out by computer:

(a) collect the apparatus characteristic parameter of Two-stand Temper Mill group, mainly comprise: 1# frame work roll diameter D _w1, 2# frame work roll diameter D _w2, working roll and backing roll original roller type Distribution Value Δ D _wi, Δ D _bi, working roll and backing roll barrel length L ₁, L ₂, working roll bending cylinder is apart from l ₂, housing screw center square l ₁, the maximum bending roller force that allows of work roll bending

With

Machine roughness Ra on 1# frame working roll ₁, machine roughness Ra on 2# frame working roll ₂, the rolling milimeter number L of 1# frame working roll ₁, the rolling milimeter number L of 2# working roll ₂, 1# frame roll-force allows maximum P _1max, 2# frame roll-force allows maximum P _1max, exit plate surface roughness roll duplicates the inlet thickness influence coefficient α of part mid frame band _h, α _h′, frame exit plate surface roughness heredity part mid frame band inlet thickness influence coefficient β _h, frame exit plate surface roughness heredity part and duplicate the material influence coefficient α of last frame band in part _k, β _k, frame exit plate surface roughness heredity part duplicates percentage elongation rate influence coefficient α in part with roll _ε, β _ε, unit equipment properties influence parameter η ₁, η ₂

(b) collect the crucial rolling technological parameter of the band for the treatment of synthetic setting metal pattern parameter, mainly comprise: the thickness cross direction profiles value H of band supplied materials _i, the supplied materials roughness Ra _s0, incoming profile cross direction profiles value L _i, the width B of band, entrance tension force T ₀, intermediate tension T ₁, outlet tension force T ₂, outlet tensile stress mean value σ ₂

(c) collect the crucial mass parameter of the band for the treatment of synthetic setting metal pattern parameter, mainly comprise: the maximum plate shape SHAPE* of permission; The maximum percentage elongation ε that allows _maxThe minimum percentage elongation ε that allows _minThe Ra ' of the standard roughness of belt steel surface _s

(d) bending roller force S is set as ground state

(e) target setting function initial value F ₀=1.0 * 10 ²⁰, 1# roll-force initial value P ₁₀=P _1max/ 5 and optimizing step delta P ₁, the initial value P of 2# roll-force ₂₀=P _2max/ 6 and optimizing step delta P ₂

(f) set 1# roll-force optimizing pilot process parameter k ₁, and make k ₁=0;

(g) make 1# roll-force P ₁=P ₁₀+ k ₁Δ P ₁

(h) set 2# roll-force optimizing pilot process parameter k ₂, and make k ₂=0;

(i) make 2# roll-force P ₂=P ₂₀+ k ₂Δ P ₂

(j) calculate percentage elongation ε under current roll-force, front and back tensile stress;

(k) judgement inequality ε _min＜ε＜ε _maxSet up? as setting up, change step (l) over to; Otherwise, change step (r) over to;

(l) utilize the roll elastic deformation model to calculate outlet tensile stress distribution σ _2i

(m) judgement inequality (max (σ _2i)-min (σ _2i))/σ ₂Does≤SHAPE* set up? as setting up, change step (n) over to, otherwise, change step (r) over to;

(n) calculate 1# frame outlet band steel roughness Ra _s1, its expression formula is

${\mathrm{Ra}}_{\mathrm{<figure-callout\; id="1"\; label="s"\; filenames="HDA00002731962900011.png"\; state="\{\{state\}\}">s</figure-callout>}1}={\mathrm{\&eta;}}_1(1-{\mathrm{\&alpha;}}_{h}H-{\mathrm{\&alpha;}}_h^{\&prime;}{H}^2)e^{{\mathrm{\&alpha;}}_k{\mathrm{\&sigma;}}_s}{e}^{{\mathrm{\&alpha;}}_{\mathrm{\&epsiv;}}{\mathrm{\&epsiv;}}_i}{\mathrm{Ra}}_{s0}+{\mathrm{\&eta;}}_2\mathrm{th}\left({\mathrm{\&beta;}}_{k}H\right)e^{{\mathrm{\&beta;}}_k{\mathrm{\&sigma;}}_s}\mathrm{th}\left({\mathrm{\&beta;}}_{\mathrm{\&epsiv;}}\mathrm{\&epsiv;}\right){\mathrm{Ra}}_{r1}{e}^{{\mathrm{<figure-callout\; id="1"\; label="B\; L\; L"\; filenames="HDA00002731962900011.png"\; state="\{\{state\}\}">B</figure-callout>}}_L{L}_{}{}_1};$

(o) calculate 2# frame outlet band steel roughness Ra _s2, its expression formula is

${\mathrm{Ra}}_{s2}={\mathrm{\&eta;}}_1(1-{\mathrm{\&alpha;}}_{h}H-{\mathrm{\&alpha;}}_h^{\&prime;}{H}^2)e^{{\mathrm{\&alpha;}}_k{\mathrm{\&sigma;}}_s}{e}^{{\mathrm{\&alpha;}}_{\mathrm{\&epsiv;}}{\mathrm{\&epsiv;}}_i}{\mathrm{Ra}}_{s1}+{\mathrm{\&eta;}}_2\mathrm{th}\left({\mathrm{\&beta;}}_{k}H\right)e^{{\mathrm{\&beta;}}_k{\mathrm{\&sigma;}}_s}\mathrm{th}\left({\mathrm{\&beta;}}_{\mathrm{\&epsiv;}}\mathrm{\&epsiv;}\right){\mathrm{Ra}}_{r2}{e}^{B_L{L}_2};$

(p) calculate roughness Controlling object function F=| (Ra _s2-Ra ' _s)/Ra ' _s|;

(q) judgement inequality F＜F ₀Set up? if set up, make F ₀=F, optimum 1# roll-force P _1y=P ₁, optimum 2# roll-force P _2y=P ₂, change step (r) over to; Otherwise, directly turn step (r);

(r) judgement inequality

Set up? if inequality is set up, make k ₂=k ₂+ 1 changes step (i) over to; Otherwise change step (s) over to;

(s) judgement inequality

Set up? if inequality is set up, make k ₁=k ₁+ 1 changes step (g) over to; Otherwise change step (t) over to;

(t) set optimum 1# roll-force P _1y, optimum 2# roll-force P _2y

Advantage of the present invention is: avoided the Two-stand Temper Mill group to control separately, consider incomplete problem, can satisfy simultaneously the requirement of two important indicators, at utmost expand the scope of the outlet belt steel surface roughness of Two-stand Temper Mill group, avoid the belt steel surface roughness overproof, produced on-site is had important directive significance.

Description of drawings

Fig. 1 is that the present invention always calculates flow chart;

Fig. 2 is resulting forward pull distribution map in the embodiment of the present invention 1;

Fig. 3 is according to the resulting forward pull distribution map of conventional method;

Fig. 4 is the resulting forward pull distribution map of the embodiment of the present invention 2;

Fig. 5 is according to the resulting forward pull distribution map of conventional method.

The specific embodiment

Embodiment 1

As shown in Figure 1, be suitable for the band steel roughness control technology calculation flow chart of Two-stand Temper Mill group existing take the supplied materials trade mark as SPCC, specification is example as the band steel of 0.50mm * 1022mm:

At first, collect the apparatus characteristic parameter of Two-stand Temper Mill group in step (a), mainly comprise: 1# frame work roll diameter D _w1=450mm, 2# frame work roll diameter D _w2=500mm, working roll and backing roll original roller type Distribution Value Δ D _wi=0, Δ D _bi=0, working roll and backing roll barrel length L ₁=1450mm, L ₂=1450mm, the inside and outside roll-bending cylinder of working roll are apart from l ₂=2300mm, housing screw center square l ₁The maximum bending roller force that=2300mm, work roll bending allow

With

Machine roughness Ra on 1# frame working roll ₁Machine roughness Ra on=1.58 μ m, 2# frame working roll ₂=0.28 μ m, the rolling milimeter number L of 1# frame working roll ₁=56km, the rolling milimeter number L of 2# working roll ₂=251km, 1# frame roll-force allow maximum P _1max=12000kN, 2# frame roll-force allow maximum P _2max=12000kN, exit plate surface roughness roll duplicate the inlet thickness influence coefficient α of part mid frame band _h=0.107, α _h′=0.0212, the inlet thickness influence coefficient β of frame exit plate surface roughness heredity part mid frame band _h=1.24, frame exit plate surface roughness heredity part and the material influence coefficient α that duplicates last frame band in part _k=2.18, β _k=-3.25, frame exit plate surface roughness heredity part is duplicated percentage elongation rate influence coefficient α in part with roll _ε=-121.6, β _ε=17.92, unit equipment properties influence parameter η ₁=0.576, η ₂=1.183;

Subsequently, in step (b), collect the crucial rolling technological parameter of the band for the treatment of synthetic setting metal pattern parameter, mainly comprise: the thickness cross direction profiles value of band supplied materials

H _i={ 0.499,0.500,0.502,0.503,0.503,0.504,0.504,0.504,0.505,0.505,0.505,0.505,0.505,0.505,0.505,0.504,0.504,0.504,0.503,0.503,0.502,0.500,0.499}, the mm of unit;

Supplied materials yield limit σ _s=190MPa, supplied materials roughness Ra _s0The cross direction profiles value L of=0.53 μ m, incoming profile _i=0, the width B=1022mm of band, entrance tension force T ₀=3400kg, intermediate tension T ₁=3450kg, outlet tension force T ₂=3500kg, outlet tensile stress mean value σ ₂=68.1MPa;

Subsequently, in step (c), collect the crucial mass parameter of the band for the treatment of synthetic setting metal pattern parameter, mainly comprise: the maximum plate shape SHAPE*=0.6 of permission; The maximum percentage elongation ε that allows _max=1.5%; The minimum percentage elongation ε that allows _min=1.1%; The Ra ' of the standard roughness of belt steel surface _s=0.23 μ m;

Subsequently, in step (d), bending roller force S is set in ground state

Subsequently, in step (e), target setting function initial value F ₀=1.0 * 10 ²⁰, 1# roll-force initial value P ₁₀=P _1max/ 5=2400kN and optimizing step delta P ₁=500kN, the initial value P of 2# roll-force ₂₀=P _2max/ 6=2000kN and optimizing step delta P ₂=200kN;

Subsequently, in step (f), set 1# roll-force optimizing pilot process parameter k ₁, and make k ₁=0;

Subsequently, in step (g), make 1# roll-force P ₁=P ₁₀+ k ₁Δ P ₁=2400kN;

Subsequently, in step (h), set 2# roll-force optimizing pilot process parameter k ₂, and make k ₂=0;

Subsequently, in step (i), make 2# roll-force P ₂=P ₂₀+ k ₂Δ P ₂=2000kN;

Subsequently, in step (j), calculate percentage elongation ε under current roll-force, front and back tensile stress=1.15%;

Subsequently, in step (k), judgement inequality ε _min＜ε＜ε _maxSet up? inequality 1.1%＜ε＜1.5% is obviously set up, and changes step (l) over to; Otherwise, change step (r) over to;

Subsequently, in step (l), utilize the roll elastic deformation model to calculate the outlet tensile stress and distribute

σ _2i={ 54.3,55.7,58.2,61.3,64.8,68.3,71.5,74.4,76.7,78.5,79.6,79.9,79.6,78.5,76.7,74.4,71.5,68.3,64.8,61.3,58.2,55.7,54.3}, units MPa;

Subsequently, in step (m), judgement inequality (max (σ _2i)-min (σ _2i))/σ ₂Does≤SHAPE* set up? inequality (79.9-54.3)/68.1≤0.6 is obviously set up, and changes step (n) over to; Otherwise, change step (n) over to;

Subsequently, in step (n), calculate 1# frame outlet band steel roughness Ra _s1, its expression formula is

${\mathrm{Ra}}_{s1}={\mathrm{\&eta;}}_1(1-{\mathrm{\&alpha;}}_{h}H-{\mathrm{\&alpha;}}_h^{\&prime;}{H}^2)e^{{\mathrm{\&alpha;}}_k{\mathrm{\&sigma;}}_s}{e}^{{\mathrm{\&alpha;}}_{\mathrm{\&epsiv;}}{\mathrm{\&epsiv;}}_i}{\mathrm{Ra}}_{s0}+{\mathrm{\&eta;}}_2\mathrm{th}\left({\mathrm{\&beta;}}_{k}H\right)e^{{\mathrm{\&beta;}}_k{\mathrm{\&sigma;}}_s}\mathrm{th}\left({\mathrm{\&beta;}}_{\mathrm{\&epsiv;}}\mathrm{\&epsiv;}\right){\mathrm{Ra}}_{r1}{e}^{{\mathrm{<figure-callout\; id="1"\; label="B\; L\; L"\; filenames="HDA00002731962900011.png"\; state="\{\{state\}\}">B</figure-callout>}}_L{L}_{}{}_1}=1.2\mathrm{\&mu;m};$

Subsequently, in step (o), calculate 2# frame outlet band steel roughness Ra _s2, its expression formula is

${\mathrm{Ra}}_{s2}={\mathrm{\&eta;}}_1(1-{\mathrm{\&alpha;}}_{h}H-{\mathrm{\&alpha;}}_h^{\&prime;}{H}^2)e^{{\mathrm{\&alpha;}}_k{\mathrm{\&sigma;}}_s}{e}^{{\mathrm{\&alpha;}}_{\mathrm{\&epsiv;}}{\mathrm{\&epsiv;}}_i}{\mathrm{Ra}}_{s1}+{\mathrm{\&eta;}}_2\mathrm{th}\left({\mathrm{\&beta;}}_{k}H\right)e^{{\mathrm{\&beta;}}_k{\mathrm{\&sigma;}}_s}\mathrm{th}\left({\mathrm{\&beta;}}_{\mathrm{\&epsiv;}}\mathrm{\&epsiv;}\right){\mathrm{Ra}}_{r2}{e}^{B_L{L}_2}=0.31\mathrm{\&mu;m};$

Subsequently, in step (p), calculate roughness Controlling object function F=| (Ra _s2-Ra ' _s)/Ra ' _s|=0.35;

Subsequently, in step (q), judgement inequality F＜F ₀Set up? if inequality is set up, make F ₀=F=0.35, optimum 1# roll-force P _1y=P ₁=2400kN, optimum 2# roll-force P _2y=P ₂=2000kN changes step (r) over to; Otherwise, directly turn step (r);

Subsequently, in step (r), judgement inequality k ₂Do＜19 set up? if inequality is set up, make k ₂=k ₂+ 1=1 changes step (i) over to; Otherwise change step (s) over to;

Subsequently, in step (s), judgement inequality k ₁Do＜50 set up? if inequality is set up, make k ₁=k ₁+ 1=1 changes step (g) over to; Otherwise change step (t) over to;

At last, in step (t), export optimum 1# roll-force P _1y=3400kN, optimum 2# roll-force P _2y=2000kN.

At last, for convenient contrast, list respectively and adopt roughness control method of the present invention and adopt conventional method to control roughness, its relevant effect is to such as shown in Fig. 2, Fig. 3 and table 1, provide respectively the outlet tensile stress distribution situation that adopts the characterization board shape that the present invention and conventional method draw, can find out by Fig. 2 and Fig. 3, adopt the present invention to export Tension Difference and be reduced to 25.62Mpa from 38.37MPa, this explanation the present invention has improved the uniformity coefficient that the outlet tensile stress distributes, and has namely improved strip shape quality.By table 1 contrast, can find out, compare with conventional method, the roughness of product can't be up to standard, and adopt optimization method of the present invention, and the products export roughness has reached claimed range, and the elongation control precision can arrive raising simultaneously.To sum up, the present invention can effectively improve the quality of products as can be known, guarantees production efficiency, for enterprise brings larger economic benefit.

Table 1

Embodiment 2

Take the supplied materials trade mark as SPCC, specification is example as the band steel of 0.19mm * 1022mm, describe specific steel grade and specification with band steel roughness control procedure and the relevant effect of steel in specific Two-stand Temper Mill group.

At first, collect the apparatus characteristic parameter of Two-stand Temper Mill group in step (a), mainly comprise: 1# frame work roll diameter D _w1=450mm, 2# frame work roll diameter D _w2=500mm, working roll and backing roll original roller type Distribution Value Δ D _wi=0, Δ D _bi=0, working roll and backing roll barrel length L ₁=1450mm, L ₂=1450mm, the inside and outside roll-bending cylinder of working roll are apart from l ₂=2300mm, housing screw center square l ₁The maximum bending roller force that=2300mm, work roll bending allow

With

Machine roughness Ra on 1# frame working roll ₁Machine roughness Ra on=1.55 μ m, 2# frame working roll ₂=0.26 μ m, the rolling milimeter number L of 1# frame working roll ₁=133km, the rolling milimeter number L of 2# working roll ₂=343km, 1# frame roll-force allow maximum P _1max=12000kN, 2# frame roll-force allow maximum P _2max=12000kN, exit plate surface roughness roll duplicate the inlet thickness influence coefficient α of part mid frame band _h=0.107, α _h′=0.0212, the inlet thickness influence coefficient β of frame exit plate surface roughness heredity part mid frame band _h=1.24, frame exit plate surface roughness heredity part and the material influence coefficient α that duplicates last frame band in part _k=2.18, β _k=-3.25, frame exit plate surface roughness heredity part is duplicated percentage elongation rate influence coefficient α in part with roll _ε=-121.6, β _ε=17.92, unit equipment properties influence parameter η ₁=0.576, η ₂=1.183;

Subsequently, in step (b), collect the crucial rolling technological parameter of the band for the treatment of synthetic setting metal pattern parameter, mainly comprise: the thickness cross direction profiles value of band supplied materials

H _i={ 0.189,0.190,0.190,0.191,0.191,0.191,0.192,0.192,0.192,0.192,0.192,0.192,0.192,0.192,0.192,0.192,0.192,0.191,0.191,0.191,0.190,0.190,0.189}, the mm of unit;

Supplied materials yield limit σ _s=390MPa, supplied materials roughness Ra _s0The cross direction profiles value L of=0.69 μ m, incoming profile _i=0, the width B=1022mm of band, entrance tension force T ₀=2000kg, intermediate tension T ₁=3550kg, outlet tension force T ₂=3000kg, outlet tensile stress mean value σ ₂=188MPa;

Subsequently, in step (c), collect the crucial mass parameter of the band for the treatment of synthetic setting metal pattern parameter, mainly comprise: the maximum plate shape SHAPE*=0.6 of permission; The maximum percentage elongation ε that allows _max=1.5%; The minimum percentage elongation ε that allows _min=1.1%; The Ra ' of the standard roughness of belt steel surface _s=0.23 μ m;

Subsequently, in step (d), bending roller force S is set in ground state

Subsequently, in step (e), target setting function initial value F ₀=1.0 * 10 ²⁰, 1# roll-force initial value P ₁₀=P _1max/ 5=2400kN and optimizing step-length Ε P ₁=500kN, the initial value P of 2# roll-force ₂₀=P _2max/ 6=2000kN and optimizing step delta P ₂=200kN;

Subsequently, in step (f), set 1# roll-force optimizing pilot process parameter k ₁, and make k ₁=0;

Subsequently, in step (g), make 1# roll-force P ₁=P ₁₀+ k ₁Δ P ₁=2400kN;

Subsequently, in step (h), set 2# roll-force optimizing pilot process parameter k ₂, and make k ₂=0;

Subsequently, in step (i), make 2# roll-force P ₂=P ₂₀+ k ₂Δ P ₂=2000kN;

Subsequently, in step (j), calculate breaking elongation ε under current roll-force, front and back tensile stress=0.81%;

Subsequently, in step (k), judgement inequality ε _min＜ε＜ε _maxSet up? if inequality 1.1%＜ε＜1.5% is set up, change step (l) over to; Otherwise, changing step (r) over to, circulation is until 1# roll-force P ₁=P ₁₀+ k ₁Δ P ₁=2400kN, 2# roll-force P ₂=P ₂₀+ k ₂Δ P ₂During=3800kN, ε=1.11%, 1.1%＜ε＜1.3% is set up;

Subsequently, in step (l), utilize the roll elastic deformation model to calculate the outlet tensile stress and distribute

σ _2i={ 164.3,170.6,176.3,181.6,186.3,190.4,193.9,196.7,199.0,200.6,201.5,201.8,201.5,200.6,199.0,196.7,193.9,190.4,186.3,181.6,176.3,170.6,164.3}, units MPa;

Subsequently, in step (m), judgement inequality (max (σ _2i)-min (σ _2i))/σ ₂Does≤SHAPE* set up? inequality (201.8-164.3)/188≤0.6 is obviously set up, and changes step (n) over to, otherwise, change step (r) over to;

Subsequently, in step (n), calculate 1# frame outlet band steel roughness Ra _s1, its expression formula is

${\mathrm{Ra}}_{s1}={\mathrm{\&eta;}}_1(1-{\mathrm{\&alpha;}}_{h}H-{\mathrm{\&alpha;}}_h^{\&prime;}{H}^2)e^{{\mathrm{\&alpha;}}_k{\mathrm{\&sigma;}}_s}{e}^{{\mathrm{\&alpha;}}_{\mathrm{\&epsiv;}}{\mathrm{\&epsiv;}}_i}{\mathrm{Ra}}_{s0}+{\mathrm{\&eta;}}_2\mathrm{th}\left({\mathrm{\&beta;}}_{k}H\right)e^{{\mathrm{\&beta;}}_k{\mathrm{\&sigma;}}_s}\mathrm{th}\left({\mathrm{\&beta;}}_{\mathrm{\&epsiv;}}\mathrm{\&epsiv;}\right){\mathrm{Ra}}_{r1}{e}^{{\mathrm{<figure-callout\; id="1"\; label="B\; L\; L"\; filenames="HDA00002731962900011.png"\; state="\{\{state\}\}">B</figure-callout>}}_L{L}_{}{}_1}=1.23\mathrm{\&mu;m};$

Subsequently, in step (o), calculate 2# frame outlet band steel roughness Ra _s2, its expression formula is

${\mathrm{Ra}}_{s2}={\mathrm{\&eta;}}_1(1-{\mathrm{\&alpha;}}_{h}H-{\mathrm{\&alpha;}}_h^{\&prime;}{H}^2)e^{{\mathrm{\&alpha;}}_k{\mathrm{\&sigma;}}_s}{e}^{{\mathrm{\&alpha;}}_{\mathrm{\&epsiv;}}{\mathrm{\&epsiv;}}_i}{\mathrm{Ra}}_{s1}+{\mathrm{\&eta;}}_2\mathrm{th}\left({\mathrm{\&beta;}}_{k}H\right)e^{{\mathrm{\&beta;}}_k{\mathrm{\&sigma;}}_s}\mathrm{th}\left({\mathrm{\&beta;}}_{\mathrm{\&epsiv;}}\mathrm{\&epsiv;}\right){\mathrm{Ra}}_{r2}{e}^{B_L{L}_2}=0.28\mathrm{\&mu;m};$

Subsequently, in step (p), calculate roughness Controlling object function F=| (Ra _s2-Ra ' _s)/Ra ' _s|=0.22;

Subsequently, in step (q), judgement inequality F＜F ₀Set up? if inequality is set up, make F ₀=F=0.22, optimum 1# roll-force P _1y=P ₁=2400kN, optimum 2# roll-force P _2y=P ₂=3800kN changes step (r) over to; Otherwise, directly turn step (r);

Subsequently, in step (r), judgement inequality k ₂Do＜19 set up? if inequality is set up, make k ₂=k ₂+ 1=10 changes step (i) over to; Otherwise change step (s) over to;

Subsequently, in step (s), judgement inequality k ₁Do＜50 set up? if inequality is set up, make k ₁=k ₁+ 1=1 changes step (g) over to; Otherwise change step (t) over to;

At last, in step (t), export optimum 1# roll-force P _1y=5400kN, optimum 2# roll-force P _2y=3200kN.

At last, for convenient contrast, list respectively and adopt roughness control method of the present invention and adopt conventional method to control roughness, with its relevant effect to such as shown in Fig. 4, Fig. 5 and table 2, provide respectively the outlet tensile stress distribution situation that adopts the characterization board shape that the present invention and conventional method draw, can find out by Fig. 4 and Fig. 5, adopt the present invention to export Tension Difference and be reduced to 30.02Mpa from 47.47MPa, this explanation the present invention has improved the uniformity coefficient that the outlet tensile stress distributes, and has namely improved strip shape quality.By table 2 contrast, can find out, compare with conventional method, the roughness of product can't be up to standard, and adopt optimization method of the present invention, and the products export roughness has reached claimed range, and the elongation control precision can arrive raising simultaneously.

Table 2

Claims (1)

1. belt steel surface roughness control method that is applicable to the Two-stand Temper Mill group is characterized in that: it comprises the following step that can be carried out by computer:

(a) collect the apparatus characteristic parameter of Two-stand Temper Mill group, mainly comprise: 1# frame work roll diameter D _w1, 2# frame work roll diameter D _w2, working roll and backing roll original roller type Distribution Value Δ D _wi, Δ D _bi, working roll and backing roll barrel length L ₁, L ₂, working roll bending cylinder is apart from l ₂, housing screw center square l ₁, the maximum bending roller force that allows of work roll bending

With

Machine roughness Ra on 1# frame working roll ₁, machine roughness Ra on 2# frame working roll ₂, the rolling milimeter number L of 1# frame working roll ₁, the rolling milimeter number L of 2# working roll ₂, 1# frame roll-force allows maximum P _1max, 2# frame roll-force allows maximum P _2max, exit plate surface roughness roll duplicates the inlet thickness influence coefficient α of part mid frame band _h, α _h′, frame exit plate surface roughness heredity part mid frame band inlet thickness influence coefficient β _h, frame exit plate surface roughness heredity part and duplicate the material influence coefficient α of last frame band in part _k, β _k, frame exit plate surface roughness heredity part duplicates percentage elongation rate influence coefficient α in part with roll _ε, β _ε, unit equipment properties influence parameter η ₁, η ₂

(b) collect the crucial rolling technological parameter of the band for the treatment of synthetic setting metal pattern parameter, mainly comprise: the thickness cross direction profiles value H of band supplied materials _i, the supplied materials roughness Ra _s0, incoming profile cross direction profiles value L _i, the width B of band, entrance tension force T ₀, intermediate tension T ₁, outlet tension force T ₂, outlet tensile stress mean value σ ₂

(c) collect the crucial mass parameter of the band for the treatment of synthetic setting metal pattern parameter, mainly comprise: the maximum plate shape SHAPE* of permission; The maximum percentage elongation ε that allows _maxThe minimum percentage elongation ε that allows _minThe Ra ' of the standard roughness of belt steel surface _s

(d) bending roller force S is set as ground state

(e) target setting function initial value F ₀=1.0 * 10 ²⁰, 1# roll-force initial value P ₁₀=P _1max/ 5 and optimizing step delta P ₁, the initial value P of 2# roll-force ₂₀=P _2max/ 6 and optimizing step delta P ₂

(f) set 1# roll-force optimizing pilot process parameter k ₁, and make k ₁=0;

(g) make 1# roll-force P ₁=P ₁₀+ k ₁Δ P ₁

(h) set 2# roll-force optimizing pilot process parameter k ₂, and make k ₂=0;

(i) make 2# roll-force P ₂=P ₂₀+ k ₂Δ P ₂

(j) calculate percentage elongation ε under current roll-force, front and back tensile stress;

(k) judgement inequality ε _min＜ε＜ε _maxSet up? as setting up, change step (l) over to; Otherwise, change step (r) over to;

(l) utilize the roll elastic deformation model to calculate outlet tensile stress distribution σ _2i

(m) judgement inequality (max (σ _2i)-min (σ _2i))/σ ₂Does≤SHAPE* set up? as setting up, change step (n) over to, otherwise, change step (r) over to;

(n) calculate 1# frame outlet band steel roughness Ra _s1, its expression formula is

${\mathrm{Ra}}_{s1}={\mathrm{\&eta;}}_1(1-{\mathrm{\&alpha;}}_{h}H-{\mathrm{\&alpha;}}_h^{\&prime;}{H}^2)e^{{\mathrm{\&alpha;}}_k{\mathrm{\&sigma;}}_s}{e}^{{\mathrm{\&alpha;}}_{\mathrm{\&epsiv;}}{\mathrm{\&epsiv;}}_i}{\mathrm{Ra}}_{s0}+{\mathrm{\&eta;}}_2\mathrm{th}\left({\mathrm{\&beta;}}_{k}H\right)e^{{\mathrm{\&beta;}}_k{\mathrm{\&sigma;}}_s}\mathrm{th}\left({\mathrm{\&beta;}}_{\mathrm{\&epsiv;}}\mathrm{\&epsiv;}\right){\mathrm{Ra}}_{r1}{e}^{B_L{L}_1};$

(o) calculate 2# frame outlet band steel roughness Ra _s2, its expression formula is

${\mathrm{Ra}}_{s2}={\mathrm{\&eta;}}_1(1-{\mathrm{\&alpha;}}_{h}H-{\mathrm{\&alpha;}}_h^{\&prime;}{H}^2)e^{{\mathrm{\&alpha;}}_k{\mathrm{\&sigma;}}_s}{e}^{{\mathrm{\&alpha;}}_{\mathrm{\&epsiv;}}{\mathrm{\&epsiv;}}_i}{\mathrm{Ra}}_{s1}+{\mathrm{\&eta;}}_2\mathrm{th}\left({\mathrm{\&beta;}}_{k}H\right)e^{{\mathrm{\&beta;}}_k{\mathrm{\&sigma;}}_s}\mathrm{th}\left({\mathrm{\&beta;}}_{\mathrm{\&epsiv;}}\mathrm{\&epsiv;}\right){\mathrm{Ra}}_{r2}{e}^{B_L{L}_2};$

(p) calculate roughness Controlling object function F=| (Ra _s2-Ra ' _s)/Ra ' _s|;

(q) judgement inequality F＜F ₀Set up? if set up, make F ₀=F, optimum 1# roll-force P _1y=P ₁, optimum 2# roll-force P _2y=P ₂, change step (r) over to; Otherwise, directly turn step (r);

(r) judgement inequality Set up? if inequality is set up, make k ₂=k ₂+ 1 changes step (i) over to; Otherwise change step (s) over to;

(s) judgement inequality Set up? if inequality is set up, make k ₁=k ₁+ 1 changes step (g) over to; Otherwise change step (t) over to;

(t) set optimum 1# roll-force P _1y, optimum 2# roll-force P _2y

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