CN102284509A - Method for comprehensively and optimally setting tension of six-roller leveling machine unit - Google Patents

Abstract

The invention relates to a method for comprehensively and optimally setting the tension of a six-roller leveling machine unit, and belongs to the technical field of leveling production. The equipment and process characteristics of the six-roller leveling machine unit in the wet leveling rolling process are fully considered, the set value of the tension of the six-roller leveling machine unit is determined and a group of leveling machine optimal tension set values are determined according to the method, and front tension transverse distribution, rolling pressure transverse distribution and inter-roller pressure transverse distribution are the most uniform on the premise of ensuring that a slip factor is in a critical point, the vibration judgment condition is met and rolling pressure is not overproof, so that the plate shape and surface quality of a finished strip are improved and the occurrence probability of the surface color difference defect of strip steel is reduced on the premise of ensuring that the leveling machine does not slip or vibrate.

Description

The smooth unit tension force of six rollers integrated optimization and setting method

Technical field

The invention belongs to smooth production technical field, the smooth unit tension force of particularly a kind of six rollers integrated optimization and setting method.

Background technology

In recent years, along with The development in society and economy, the demand of strip material is increasing, and people are also more and more higher to the requirement of strip material amount.And smooth produce as cold rolled sheet near a procedure of finished product, afterwards mechanical performance of products and strip shape quality not only can guarantee to anneal by percentage elongation and the plate shape of control band, and can form certain roughness at belt steel surface, reach the purpose that improves band steel paintability and forming property.In the past, under the situation of given percentage elongation, the improvement of flatness defect and the restricted problem of maximum draught pressure are only considered for the setting of smooth unit tension force in the scene, and defectives such as advancing slip, vibration, aberration are not considered, might cause the skin pass rolling instability like this, problems such as travers, chromatic aberration defect appear in the finished strip surface, cause the product quality degradation, have caused bigger economic loss to unit.For this reason, patent of the present invention is through a large amount of field trial and theoretical research, fully take into account the equipment and technology characteristics of the wet smoothing and rolling process of Shoudu Iron and Steel Co 1850 smooth units, adopt comparison method, seek one group of planisher optimum tension setting value, guaranteeing that slip factor is in critical point, forward pull is horizontal under the prerequisite that the vibration Rule of judgment satisfies and draught pressure is not overproof, draught pressure, the roll gap pressure cross direction profiles is the most even, finally be implemented in guarantee smooth unit do not occur skidding with the prerequisite of vibrating under, improve the plate shape and the surface quality of finished product band, reduce the probability of happening of belt steel surface chromatic aberration defect.

Summary of the invention

The object of the invention is to provide the smooth unit tension force of a kind of six rollers integrated optimization and setting method, determine the setting value of the smooth unit tension force of six rollers according to this method, guarantee smooth unit do not occur skidding with the prerequisite of vibrating under, improve the plate shape and the surface quality of finished product band, reduce the probability of happening of belt steel surface chromatic aberration defect.

Originally comprise processing step (as shown in Figure 1):

1, collects the equipment and the technological parameter of smooth unit, comprise working roll barrel length L _W, work roll diameter D _W, intermediate calender rolls barrel length L _M, intermediate calender rolls diameter D _M, backing roll barrel length L _b, backing roll diameter D _b, backing roll transmission side and active side housing screw centre-to-centre spacing l ₁, working roll transmission side and active side roller hydraulic cylinder centre-to-centre spacing l ₂, the equivalent stiffness K of milling train _m, the distance L before and after equivalent mass M, the smooth unit between wrinkle resistant roller, the maximum positive bending roller force of working roll

The maximum negative bending roller force of working roll

Intermediate calender rolls transmission side and active side roller hydraulic cylinder centre-to-centre spacing l ₃, the maximum positive bending roller force of intermediate calender rolls

The maximum negative bending roller force of intermediate calender rolls

Draught pressure maximum P _Max

2, collection treats that the characteristic parameter of smooth band steel comprises strip width b, thickness h, tensile strength sigma _b

3, the basic skin pass rolling technological parameter of collecting in the band smoothing and rolling process comprises percentage elongation ε, the critical slip factor value of smooth unit ψ ^*, band aberration critical value k _s, roll aberration critical value k _r, smooth unit maximum forward pull T allowable _1max, smooth unit minimum forward pull T allowable _1min, smooth unit maximum backward pull T allowable _0max, smooth unit minimum backward pull T allowable _0min

4, the setting value of given work roll bending power

The setting value of intermediate calender rolls bending roller force $S_m=\frac{S_{m\max }^{+}-S_{m\max }^{-}}{2},$ The setting value δ of roll shifting amount=0;

5, the initial set value F of given tension force synthetic setting object function ₀=1.0 * 10 ¹⁰, tension force is set step delta T;

6, the definition forward pull is set pilot process parameter k ₁, and make k ₁=0;

7, make forward pull T ₁=T _1min+ k ₁Δ T;

8, the definition backward pull is set pilot process parameter k ₂, and make k ₂=0;

9, make backward pull T ₀=T _0min+ k ₂Δ T;

10, calculate under forward pull and rolling mill practice condition total draught pressure P, absolute draft amount Δ h, working roll flatten radius R ', system frequency ω;

11, judge inequality PpP _MaxWhether set up,, change step 12 over to if set up.If inequality is false, then change step 23 over to;

12, calculate the value ψ of slip factor under forward pull and rolling mill practice condition;

13, judge inequality ψ≤ψ ^*Whether set up,, change step 14 over to if set up.If inequality is false, then change step 23 over to;

14, calculate vibration and judge parameter

15, judge inequality Whether set up,, change step 16 over to if set up.If inequality is false, then change step 23 over to;

16, calculate the band forward pull cross direction profiles value σ that works as under forward pull and the rolling mill practice condition _1i, draught pressure cross direction profiles value q ' _iThe roll gap pressure cross direction profiles value q of working roll and intermediate calender rolls _Wmi, intermediate calender rolls and backing roll roll gap pressure cross direction profiles value q _Bmi

17, calculate band aberration influence function $F_s(T_1,T_0)={\left(\frac{{\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="HDA0000079475520000011.png"\; state="\{\{state\}\}">k</figure-callout>}}_0}{{\mathrm{\&sigma;}}_s}\right)}^{0.87}[\mathrm{\&alpha;}\frac{\max \left({q^{\&prime;}}_i\right)-\min \left({q^{\&prime;}}_i\right)}{\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{q^{\&prime;}}_i}+(1-\mathrm{\&alpha;})\frac{\max \left({\mathrm{\&sigma;}}_{1i}\right)-\min \left({\mathrm{\&sigma;}}_{1i}\right)}{T_1}]$ (in the formula, k ₀Be standard resistance of deformation, k ₀=180:220Mpa; I is the Cross slat unit of band; N is the total Cross slat unit number of band; α is a weight coefficient, general α=0.6) numerical value;

18, judge inequality F _s(T ₁, T ₀)≤k _sWhether set up,, change step 19 over to if set up.If inequality is false, then change step 23 over to;

19, calculate roll aberration influence function

$F_r(T_1,T_0)=\max \left\{{\left[\frac{K_0}{\min (K_m,K_w)}\right]}^{0.63}\right[\frac{\max \left(q_{\mathrm{mwi}}\right)-\min \left(q_{\mathrm{mwi}}\right)}{\frac{1}{n_{j1}}\underset{i=1}{\overset{n_1}{\mathrm{\&Sigma;}}}{q}_{\mathrm{mwi}}}],{\left[\frac{K_0}{\min (K_m,K_b)}\right]}^{0.63}[\frac{\max \left(q_{\mathrm{mbi}}\right)-\min \left(q_{\mathrm{mbi}}\right)}{\frac{1}{{\mathrm{<figure-callout\; id="2"\; label="n\; j"\; filenames="HDA0000079475520000011.png"\; state="\{\{state\}\}">n</figure-callout>}}_j}\underset{i=1}{\overset{n_2}{\mathrm{\&Sigma;}}}{q}_{\mathrm{mbi}}}\left]\right\}$

(in the formula, K ₀Be standard roller surface hardness, K ₀=1100:1200Mpa; K _wBe the work roll surface actual hardness; K _mBe intermediate calender rolls surface actual hardness; K _bBe the roll surface actual hardness; n ₁For contacting the total Cross slat unit number of contact portion between working roll and the intermediate calender rolls; n ₂For contacting the total Cross slat unit number of contact portion between backing roll and the intermediate calender rolls) numerical value;

20, judge inequality F _r(T ₁, T ₀)≤k _rWhether set up,, change step 21 over to if set up.If inequality is false, then change step 23 over to;

21, the tension force synthetic setting objective function F (T under the current technological parameter of calculating ₁, T ₀)=β F _s(T ₁, T ₀)+(1-β) F _r(T ₁, T ₀) numerical value of (β is a weight coefficient in the formula, generally gets 0.4-0.6);

22, judge inequality F (T ₁, T ₀)≤F ₀Set up? if set up, then make F ₀=F (T ₁, T ₀), T _1y=T ₁, T _0y=T ₀, change step 23 over to.Otherwise, then directly change step 23 over to;

23, judge inequality

Set up? if set up, then make k ₂=k ₂+ 1, change step 9 over to.If inequality is false, then change step 24 over to;

24, judge inequality

Set up? if set up, then make k ₁=k ₁+ 1, change step 7 over to.If inequality is false, then change step 25 over to;

25, the smooth unit optimum tension setting value of output T _1y, T _0y

The invention has the advantages that, determine the setting value of the smooth unit tension force of six rollers according to this method, determine one group of planisher optimum tension setting value, guarantee slip factor critical point with the prerequisite interior, that the vibration Rule of judgment satisfies and draught pressure is not overproof under forward pull laterally, draught pressure, roll gap pressure cross direction profiles be the most even, finally be implemented in guarantee smooth unit do not occur skidding with the prerequisite of vibrating under, improve the plate shape and the surface quality of finished product band, reduce the probability of happening of belt steel surface chromatic aberration defect.

Description of drawings

Fig. 1 is the smooth unit tension force of six a rollers integrated optimization and setting computing block diagram among the present invention.

The specific embodiment

Below by accompanying drawing preferred embodiment of the present invention is described.By below in conjunction with the description of accompanying drawing, can further understand purpose of the present invention, feature and advantage to preferred embodiment of the present invention.

Embodiment 1

In order to set forth basic thought of the present invention, existing is example with the smooth unit of certain 1,850 six roller, and describing specification by means of Fig. 1 is that 1200mm*0.6mm, steel grade are the tension force optimization assignment procedure of band steel on specific smooth unit of SPCC.

At first, in step 1, collect the equipment and the technological parameter of smooth unit, comprise working roll barrel length L _W=1850mm, work roll diameter D _W=360mm, intermediate calender rolls barrel length L _M=1850mm, intermediate calender rolls diameter D _M=400mm, backing roll barrel length L _b=1850mm, backing roll diameter D _b=900mm, backing roll transmission side and active side housing screw centre-to-centre spacing l ₁=2500mm, working roll transmission side and active side roller hydraulic cylinder centre-to-centre spacing l ₂=2500mm, the equivalent stiffness K of milling train _m=2676000, the distance L=5000mm before and after equivalent mass M=125, the smooth unit between wrinkle resistant roller, the maximum positive bending roller force of working roll

The maximum negative bending roller force of working roll

Intermediate calender rolls transmission side and active side roller hydraulic cylinder centre-to-centre spacing l ₃=2500mm, the maximum positive bending roller force of intermediate calender rolls

The maximum negative bending roller force of intermediate calender rolls

Draught pressure maximum P _Max=1200t;

Subsequently, in step 2, collect and treat that the characteristic parameter of smooth band steel comprises strip width b=1200mm, thickness h=0.6mm, tensile strength sigma _b=360Mpa;

Subsequently, in step 3, the basic skin pass rolling technological parameter of collecting in the band smoothing and rolling process comprises percentage elongation ε=0.8%, the critical slip factor value of smooth unit ψ ^*=0.41, band aberration critical value k _s=0.46, roll aberration critical value k _r=0.25, smooth unit maximum forward pull T allowable _1max=144Mpa, smooth unit minimum forward pull T allowable _1min=36Mpa, smooth unit maximum backward pull T allowable _0max=144Mpa, smooth unit minimum backward pull T allowable _0min=36Mpa;

Subsequently, in step 4, the setting value of given work roll bending power

The setting value of intermediate calender rolls bending roller force

The setting value δ of roll shifting amount=0;

Subsequently, in step 5, the initial set value F of given tension force synthetic setting object function ₀=1.0 * 10 ¹⁰, tension force is set step delta T=1Mpa;

Subsequently, in step 6, the definition forward pull is set pilot process parameter k ₁, and make k ₁=0;

Subsequently, in step 7, make forward pull T ₁=T _1min+ k ₁Δ T=36Mpa;

Subsequently, in step 8, the definition backward pull is set pilot process parameter k ₂, and make k ₂=0;

Subsequently, in step 9, make backward pull T ₀=T _0min+ k ₂Δ T=36Mpa;

Subsequently, in step 10, calculate under forward pull and rolling mill practice condition total draught pressure P=450t, absolute draft amount Δ h=0.0048mm, working roll flatten radius R '=213.2mm, system frequency ω=146.3147;

Subsequently, in step 11, judge inequality PpP _MaxWhether set up,, change step 12 over to if set up.If inequality is false, then change step 23 over to;

Subsequently, in step 12, calculate value ψ=0.23 of slip factor under forward pull and rolling mill practice condition;

Subsequently, in step 13, judge whether inequality ψ≤0.41 sets up,, change step 14 over to if set up.If inequality is false, then change step 23 over to;

Subsequently, in step 14, calculate vibration and judge parameter

Subsequently, in step 15, judge inequality

Whether set up,, change step 16 over to if set up.If inequality is false, then change step 23 over to;

Subsequently, in step 16, calculate the band forward pull cross direction profiles value σ under forward pull and rolling mill practice condition _1i, draught pressure cross direction profiles value q ' _iThe roll gap pressure cross direction profiles value q of working roll and intermediate calender rolls _Wmi, intermediate calender rolls and backing roll roll gap pressure cross direction profiles value q _Bmi

Subsequently, in step 17, calculate band aberration influence function

$F_s(T_1,T_0)={\left(\frac{{\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="HDA0000079475520000011.png"\; state="\{\{state\}\}">k</figure-callout>}}_0}{{\mathrm{\&sigma;}}_s}\right)}^{0.87}[\mathrm{\&alpha;}\frac{\max \left({q^{\&prime;}}_i\right)-\min \left({q^{\&prime;}}_i\right)}{\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{q^{\&prime;}}_i}+(1-\mathrm{\&alpha;})\frac{\max \left({\mathrm{\&sigma;}}_{1i}\right)-\min \left({\mathrm{\&sigma;}}_{1i}\right)}{T_1}]=0.21;$

Subsequently, in step 18, judge inequality F _s(T ₁, T ₀Whether set up)≤0.46, if set up, changes step 19 over to.If inequality is false, then change step 23 over to;

Subsequently, in step 19, calculate roll aberration influence function

$F_r(T_1,T_0)=\max \left\{{\left[\frac{K_0}{\min (K_m,K_w)}\right]}^{0.63}\right[\frac{\max \left(q_{\mathrm{mwi}}\right)-\min \left(q_{\mathrm{mwi}}\right)}{\frac{1}{n_{j1}}\underset{i=1}{\overset{n_1}{\mathrm{\&Sigma;}}}{q}_{\mathrm{mwi}}}],{\left[\frac{K_0}{\min (K_m,K_b)}\right]}^{0.63}[\frac{\max \left(q_{\mathrm{mbi}}\right)-\min \left(q_{\mathrm{mbi}}\right)}{\frac{1}{{\mathrm{<figure-callout\; id="2"\; label="n\; j"\; filenames="HDA0000079475520000011.png"\; state="\{\{state\}\}">n</figure-callout>}}_j}\underset{i=1}{\overset{n_2}{\mathrm{\&Sigma;}}}{q}_{\mathrm{mbi}}}\left]\right\}=0.12;$

Subsequently, in step 20, judge inequality F _r(T ₁, T ₀Whether set up)≤0.25, if set up, changes step 21 over to.If inequality is false, then change step 23 over to;

Subsequently, in step 21, calculate the tension force synthetic setting objective function F (T under the current technological parameter ₁, T ₀)=β F _s(T ₁, T ₀)+(1-β) F _r(T ₁, T ₀)=0.165 (weight coefficient β gets 0.5);

Subsequently, in step 22, judge inequality F (T ₁, T ₀)≤F ₀Set up? if set up, then make F ₀=F (T ₁, T ₀), T _1y=T ₁, T _0y=T ₀, change step 23 then over to.If be false, then directly change step 23 over to;

Subsequently, in step 23, judge inequality

Set up? if set up, then make k ₂=k ₂+ 1, change step 9 over to.If inequality is false, then change step 24 over to;

Subsequently, in step 24, judge inequality

Set up? if set up, then make k ₁=k ₁+ 1, change step 7 over to.If inequality is false, then change step 25 over to;

At last, in step 25, export smooth unit optimum tension setting value T _1y, T _0y

Embodiment 2

In order further to set forth basic thought of the present invention, existing is example with the smooth unit of certain 1,850 six roller, and describing specification by means of Fig. 1 is that 1600mm*1.0mm, steel grade are the tension force optimization assignment procedure of band steel on specific smooth unit of DC06.

At first, in step 1, collect the equipment and the technological parameter of smooth unit, comprise working roll barrel length L _W=1850mm, work roll diameter D _W=360mm, intermediate calender rolls barrel length L _M=1850mm, intermediate calender rolls diameter D _M=420mm, backing roll barrel length L _b=1850mm, backing roll diameter D _b=900mm, backing roll transmission side and active side housing screw centre-to-centre spacing l ₁=2500mm, working roll transmission side and active side roller hydraulic cylinder centre-to-centre spacing l ₂=2500mm, the equivalent stiffness K of milling train _m=2676000, the distance L=5000mm before and after equivalent mass M=125, the smooth unit between wrinkle resistant roller, the maximum positive bending roller force of working roll

The maximum negative bending roller force of working roll

Intermediate calender rolls transmission side and active side roller hydraulic cylinder centre-to-centre spacing l ₃=2500mm, the maximum positive bending roller force of intermediate calender rolls

The maximum negative bending roller force of intermediate calender rolls Draught pressure maximum P _Max=1200t;

Subsequently, in step 2, collect and treat that the characteristic parameter of smooth band steel comprises strip width b=1600mm, thickness h=1.0mm, tensile strength sigma _b=120Mpa;

Subsequently, in step 3, the basic skin pass rolling technological parameter of collecting in the band smoothing and rolling process comprises percentage elongation ε=1.0%, the critical slip factor value of smooth unit ψ ^*=0.41, band aberration critical value k _s=0.46, roll aberration critical value k _r=0.25, smooth unit maximum forward pull T allowable _1max=48Mpa, smooth unit minimum forward pull T allowable _1min=12Mpa, smooth unit maximum backward pull T allowable _0max=48Mpa, smooth unit minimum backward pull T allowable _0min=12Mpa;

Subsequently, in step 4, the setting value of given work roll bending power

The setting value of intermediate calender rolls bending roller force The setting value δ of roll shifting amount=0;

Subsequently, in step 5, the initial set value F of given tension force synthetic setting object function ₀=1.0 * 10 ¹⁰, tension force is set step delta T=1Mpa;

Subsequently, in step 6, the definition forward pull is set pilot process parameter k ₁, and make k ₁=0;

Subsequently, in step 7, make forward pull T ₁=T _1min+ k ₁Δ T=12Mpa;

Subsequently, in step 8, the definition backward pull is set pilot process parameter k ₂, and make k ₂=0;

Subsequently, in step 9, make backward pull T ₀=T _0min+ k ₂Δ T=12Mpa;

Subsequently, in step 10, calculate under forward pull and rolling mill practice condition total draught pressure P=153t, absolute draft amount Δ h=0.01mm, working roll flatten radius R '=201.1mm, system frequency ω=146.3147;

Subsequently, in step 11, judge inequality PpP _MaxWhether=1200t sets up, if set up, changes step 12 over to.If inequality is false, then change step 23 over to;

Subsequently, in step 12, calculate value ψ=0.15 of slip factor under forward pull and rolling mill practice condition;

Subsequently, in step 13, judge whether inequality ψ≤0.41 sets up,, change step 14 over to if set up.If inequality is false, then change step 23 over to;

Subsequently, in step 14, calculate vibration and judge parameter

Subsequently, in step 15, judge inequality

Whether set up,, change step 16 over to if set up.If inequality is false, then change step 23 over to;

Subsequently, in step 16, calculate the band forward pull cross direction profiles value σ under forward pull and rolling mill practice condition _1i, draught pressure cross direction profiles value q ' _iThe roll gap pressure cross direction profiles value q of working roll and intermediate calender rolls _Wmi, intermediate calender rolls and backing roll roll gap pressure cross direction profiles value q _Bmi

Subsequently, in step 17, calculate band aberration influence function

$F_s(T_1,T_0)={\left(\frac{{\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="HDA0000079475520000011.png"\; state="\{\{state\}\}">k</figure-callout>}}_0}{{\mathrm{\&sigma;}}_s}\right)}^{0.87}[\mathrm{\&alpha;}\frac{\max \left({q^{\&prime;}}_i\right)-\min \left({q^{\&prime;}}_i\right)}{\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{q^{\&prime;}}_i}+(1-\mathrm{\&alpha;})\frac{\max \left({\mathrm{\&sigma;}}_{1i}\right)-\min \left({\mathrm{\&sigma;}}_{1i}\right)}{T_1}]=0.16;$

Subsequently, in step 18, judge inequality F _s(T ₁, T ₀Whether set up)≤0.46, if set up, changes step 19 over to.If inequality is false, then change step 23 over to;

Subsequently, in step 19, calculate roll aberration influence function

$F_r(T_1,T_0)=\max \left\{{\left[\frac{{\mathrm{<figure-callout\; id="0"\; label="K"\; filenames="HDA0000079475520000011.png"\; state="\{\{state\}\}">K</figure-callout>}}_0}{\min (K_m,K_w)}\right]}^{0.63}\right[\frac{\max \left(q_{\mathrm{mwi}}\right)-\min \left(q_{\mathrm{mwi}}\right)}{\frac{1}{n_{j1}}\underset{i=1}{\overset{n_1}{\mathrm{\&Sigma;}}}{q}_{\mathrm{mwi}}}],{\left[\frac{{\mathrm{<figure-callout\; id="0"\; label="K"\; filenames="HDA0000079475520000011.png"\; state="\{\{state\}\}">K</figure-callout>}}_0}{\min (K_m,K_b)}\right]}^{0.63}[\frac{\max \left(q_{\mathrm{mbi}}\right)-\min \left(q_{\mathrm{mbi}}\right)}{\frac{1}{{\mathrm{<figure-callout\; id="2"\; label="n\; j"\; filenames="HDA0000079475520000011.png"\; state="\{\{state\}\}">n</figure-callout>}}_j}\underset{i=1}{\overset{n_2}{\mathrm{\&Sigma;}}}{q}_{\mathrm{mbi}}}\left]\right\}=0.09;$

Subsequently, in step 20, judge inequality F _r(T ₁, T ₀Whether set up)≤0.25, if set up, changes step 21 over to.If inequality is false, then change step 23 over to;

Subsequently, in step 21, calculate the tension force synthetic setting objective function F (T under the current technological parameter ₁, T ₀)=β F _s(T ₁, T ₀)+(1-β) F _r(T ₁, T ₀)=0.125 (weight coefficient β gets 0.5);

Subsequently, in step 22, judge inequality F (T ₁, T ₀)≤F ₀Set up? if set up, then make F ₀=F (T ₁, T ₀), T _1y=T ₁, T _0y=T ₀, change step 23 then over to.If be false, then directly change step 23 over to;

Subsequently, in step 23, judge inequality

Set up? if set up, then make k ₂=k ₂+ 1, change step 9 over to.If inequality is false, then change step 24 over to;

Subsequently, in step 24, judge inequality

Set up? if set up, then make k ₁=k ₁+ 1, change step 7 over to.If inequality is false, then change step 25 over to;

At last, in step 25, export smooth unit optimum tension setting value T _1y, T _0y

Claims (1)

1. the smooth unit tension force of a roller integrated optimization and setting method is characterized in that, comprises following processing step:

(1), collect the equipment and the technological parameter of smooth unit, comprise working roll barrel length L _W, work roll diameter D _W, intermediate calender rolls barrel length L _M, intermediate calender rolls diameter D _M, backing roll barrel length L _b, backing roll diameter D _b, backing roll transmission side and active side housing screw centre-to-centre spacing l ₁, working roll transmission side and active side roller hydraulic cylinder centre-to-centre spacing l ₂, the equivalent stiffness K of milling train _m, the distance L before and after equivalent mass M, the smooth unit between wrinkle resistant roller, the maximum positive bending roller force of working roll

The maximum negative bending roller force of working roll

Intermediate calender rolls transmission side and active side roller hydraulic cylinder centre-to-centre spacing l ₃, the maximum positive bending roller force of intermediate calender rolls

The maximum negative bending roller force of intermediate calender rolls

Draught pressure maximum P _Max

(2), collection treats that the characteristic parameter of smooth band steel comprises strip width b, thickness h, tensile strength sigma _b

(3), the basic skin pass rolling technological parameter of collecting in the band smoothing and rolling process comprises percentage elongation ε, the critical slip factor value of smooth unit ψ ^*, band aberration critical value k _s, roll aberration critical value k _r, smooth unit maximum forward pull T allowable _1max, smooth unit minimum forward pull T allowable _1min, smooth unit maximum backward pull T allowable _0max, smooth unit minimum backward pull T allowable _0min

(4), the setting value of given work roll bending power

The setting value of intermediate calender rolls bending roller force $S_m=\frac{S_{m\max }^{+}-S_{m\max }^{-}}{2},$ The setting value δ of roll shifting amount=0;

(5), the initial set value F of given tension force synthetic setting object function ₀=1.0 * 10 ¹⁰, tension force is set step delta T;

(6), the definition forward pull is set pilot process parameter k ₁, and make k ₁=0;

(7), make forward pull T ₁=T _1min+ k ₁Δ T;

(8), tension force is set pilot process parameter k ₂, and make k ₂=0;

(9), power T ₀=T _0min+ k ₂Δ T;

(10), under tension force and the rolling mill practice condition total draught pressure P, absolute draft amount Δ h, working roll flatten radius R ', system frequency ω;

(11), judge inequality PpP _MaxWhether set up,, change step (12) over to if set up; If inequality is false, then change step (23) over to;

(12), calculate the value ψ of slip factor under forward pull and rolling mill practice condition;

(13), judge inequality ψ≤ψ ^*Whether set up,, change step (14) over to if set up; If inequality is false, then change step (23) over to;

(14), calculate vibration and judge parameter

(15), judge inequality

Whether set up,, change step (16) over to if set up; If inequality is false, then change step (23) over to;

(16), calculate the band forward pull cross direction profiles value σ that works as under forward pull and the rolling mill practice condition _1i, draught pressure cross direction profiles value q ' _iThe roll gap pressure cross direction profiles value q of working roll and intermediate calender rolls _Wmi, intermediate calender rolls and backing roll roll gap pressure cross direction profiles value q _Bmi

(17), calculate band aberration influence function $F_s(T_1,T_0)={\left(\frac{k_0}{{\mathrm{\&sigma;}}_s}\right)}^{0.87}[\mathrm{\&alpha;}\frac{\max \left({q^{\&prime;}}_i\right)-\min \left({q^{\&prime;}}_i\right)}{\frac{1}{n}\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{q^{\&prime;}}_i}+(1-\mathrm{\&alpha;})\frac{\max \left({\mathrm{\&sigma;}}_{1i}\right)-\min \left({\mathrm{\&sigma;}}_{1i}\right)}{T_1}]$ Numerical value, in the formula, k ₀Be standard resistance of deformation, k ₀=180:220Mpa; I is the Cross slat unit of band; N is the total Cross slat unit number of band; α is a weight coefficient, α=0.6;

(18), judge inequality F _s(T ₁, T ₀)≤k _sWhether set up,, change step 19 over to if set up.If inequality is false, then change step (23) over to;

(19), calculate roll aberration influence function

$F_r(T_1,T_0)=\max \left\{{\left[\frac{K_0}{\min (K_m,K_w)}\right]}^{0.63}\right[\frac{\max \left(q_{\mathrm{mwi}}\right)-\min \left(q_{\mathrm{mwi}}\right)}{\frac{1}{n_{j1}}\underset{i=1}{\overset{n_1}{\mathrm{\&Sigma;}}}{q}_{\mathrm{mwi}}}],{\left[\frac{K_0}{\min (K_m,K_b)}\right]}^{0.63}[\frac{\max \left(q_{\mathrm{mbi}}\right)-\min \left(q_{\mathrm{mbi}}\right)}{\frac{1}{n_{j2}}\underset{i=1}{\overset{n_2}{\mathrm{\&Sigma;}}}{q}_{\mathrm{mbi}}}\left]\right\}$

Numerical value, in the formula, K ₀Be standard roller surface hardness, K ₀=1100:1200Mpa; K _wBe the work roll surface actual hardness; K _mBe intermediate calender rolls surface actual hardness; K _bBe the roll surface actual hardness; n ₁For contacting the total Cross slat unit number of contact portion between working roll and the intermediate calender rolls; n ₂For contacting the total Cross slat unit number of contact portion between backing roll and the intermediate calender rolls;

(20), judge inequality F _r(T ₁, T ₀)≤k _rWhether set up,, change step (21) over to if set up; If inequality is false, then change step (23) over to;

(21), the tension force synthetic setting objective function F (T under the current technological parameter of calculating ₁, T ₀)=β F _s(T ₁, T ₀)+(1-β) F _r(T ₁, T ₀) numerical value, β is a weight coefficient in the formula, generally gets 0.4-0.6;

(22), judge inequality F (T ₁, T ₀)≤F ₀Set up? if set up, then make F ₀=F (T ₁, T ₀), T _1y=T ₁, T _0y=T ₀, change step 23 over to.Otherwise, directly change step (23) over to;

(23), judge inequality

Set up? if set up, then make k ₂=k ₂+ 1, change step (9) over to, if inequality is false, then change step 24 over to;

(24), judge inequality

Set up? if set up, then make k ₁=k ₁+ 1, change step (7) over to, if inequality is false, then change step 25 over to;

(25), the smooth unit optimum tension setting value of output T _1y, T _0y

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