CN101927266B - Method for controlling rolling mode of temper mill - Google Patents

Abstract

The invention discloses a method for controlling a rolling mode of a pinch pass mill set so as to control 1# and 2# frames of the pinch pass mill. The method can realize the optimum control for specific elongation by choosing a proper rolling mode according to device parameters of a singe and double dual purpose pinch pass mill set and the technique parameters of belt materials, wherein the device parameters comprise a frame stiffness and ultimate tension and the technique parameters comprise the roughness of supplied material, the allowed scope for the roughness of the finished products, and the allowed scope for the specific elongation. The method can fully satisfy the customers in product mechanical property, surface quality, and the like, enhance the adaptability of the mill set to the products, lower the investment cost, exert the potential of the mill set and promote the use ratio of the device. The method of the invention is simple, clear and is suitable for on-line application.

Description

A kind of control method of rolling mode of pinch pass mill set

Technical field

The present invention relates to the cold rolling technology field, relate in particular to a kind of method that percentage elongation is controlled rolling mode of passing through that is used for smooth unit.

Background technology

Smooth produce as cold rolled sheet near the one procedure of finished product; Afterwards mechanical performance of products and type quality not only can guarantee to anneal through 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.Like this, along with the user improves constantly what aspects such as band steel mechanical performance, plate shape, surface quality required, the importance of smooth operation just shows especially out day by day.Corresponding with it, smooth arrangement forms such as single chassis four (six) roller planishers, two-shipper frame four (six) roller planishers have appearred both at home and abroad in succession since generation nineteen sixty.And show according to pertinent literature and production experience; The smooth unit of two-shipper frame is suitable for MR series cold-rolled tin plate or has the production of the product of big percentage elongation demand; The smooth unit of single chassis then is fit to the production of SPCC series cold-rolling deep-punching plate or little percentage elongation demand; Two kinds relatively clearer and more definite in the division of labor, and especially the former can't replace the latter and produces.But, the continuous variation of As market, the kind of product that iron and steel enterprise produces is also brought in constant renewal in thereupon and is changed.Corresponding with it, single smooth production model just can not satisfy field demand, and many flat lines of the compelled construction of many for this reason steel plant are to be fit to the production requirement of various cold-rolled products.Like this, not only increase cost of investment, and reduced utilization rate of equipment and installations.So; In order to adapt to the characteristics of modern steel enterprise kind diversification, domestic relevant enterprise is developed the smooth unit of a cover single-double dual-purpose first, promptly adopts a cover unit to realize that the demand that can satisfy single chassis production can satisfy the needs that the two-shipper frame is produced again; Thereby strengthened the adaptability of unit widely to product; Reduce cost of investment, and given full play of the potential of unit, improved usage ratio of equipment.But because the smooth unit of single-double dual-purpose belongs to domestic exploitation first; And mainly concentrate on single chassis or two-shipper frame flattening process about the document of smooth aspect; Do not retrieve both at home and abroad any and the relevant document of the smooth unit of single-double dual-purpose, in the operation of rolling of the smooth unit of single-double dual-purpose, how to select suitable rolling mode just to become the emphasis of work place study and exploitation like this.

Can know that according to field experience smooth as the one procedure of cold-reduced sheet production near finished product, its major function is: (1) guarantees the product mechanical performance after the annealing---control band steel percentage elongation; (2) type quality---the control panel shape of assurance product; (3) polishing belt steel surface, and form certain roughness at belt steel surface, improve the paintability and the forming property of band steel.For two-shipper frame planisher, its major advantage is can above-mentioned functions be born by two frames respectively, emphasizes particularly on different fields a little.Generally speaking, two-shipper frame planisher the 1st frame is mainly born extension function, guarantees the product mechanical performance; And the 2nd frame mainly is a control panel shape, and forms certain roughness at belt steel surface, and emphasis guarantees the profile and the surface quality of product.The single chassis planisher then must realize controlling mechanical performance, strip shape quality and surface roughness simultaneously, attends to one thing and lose sight of another unavoidably.For example,, must reach certain smooth percentage elongation, cause draught pressure bigger than normal, produce limit wave trend, and the belt steel surface roughness can not be controlled quantitatively in order to guarantee certain mechanical performance of products.At this moment, if that adopt two-shipper frame planisher then can address this problem.Meanwhile, be not that all products can both be produced on two-shipper frame planisher yet.For example, for percentage elongation required lower thick soft material (like the IF steel), adopting two-shipper frame planisher to produce then might be improper.Because; The steel grade of the type; The setting value of breaking elongation is original just little, and when being born by two frames, following two consequences then possibly occur: (1) draught pressure is less than normal; This moment, the rigidity of milling train was a variable rather than constant, caused the precision of rolling instability and elongation control also not high; (2) because each frame percentage elongation is all very little, cause in the formation process roughness duplicating rate less than normal, can not guarantee surface quality (in formation process, it is closely related that the roll roughness is duplicated the ability and the reduction ratio of strip surface, and be non-linear) with steel.Just can not adopt two-shipper frame planisher to produce this moment.Just why the scene needs the reason of the smooth unit of exploitation single-double dual-purpose with the production requirement of suitable various cold-rolled products for this.

Summary of the invention

The objective of the invention is through a kind of control method of rolling mode of pinch pass mill set is provided; Can select suitable rolling mode according to the device parameter (mainly comprising housing rigidity, limit tension etc.) of the smooth unit of single-double dual-purpose and the technological parameter of band (mainly comprising supplied materials roughness, finished product roughness allowed band, percentage elongation allowed band etc.); Realize the optimum control of percentage elongation; Fully satisfy the demand of user, strengthen the adaptability of unit, reduce cost of investment product to aspects such as product mechanical performance, surface quality; Give play to the potential of unit, improved usage ratio of equipment.The method of the invention is simple and clear, is fit to online application.

The present invention realizes that the technical scheme of above-mentioned purpose is: a kind of control method of rolling mode of pinch pass mill set is used to control 1 of smooth unit ^#With 2 ^#Frame may further comprise the steps:

(a) the capital equipment parameter of the smooth unit of collection: 1 ^#With 2 ^#Frame work roll diameter D _W1, D _W2, 1 ^#With 2 ^#Frame working roll initial roughness Ra _R1, Ra _R2, 1 ^#With 2 ^#The rolling milimeter number L of frame working roll ₁, L ₂

(b) collect the crucial rolling technological parameter of treating smooth product: thickness of strip H, width B, strength of materials σ _s, percentage elongation allowed band ε _MinWith ε _Max, supplied materials roughness Ra ₀, finished product roughness allowed band Ra _1minWith Ra _1max, forward pull allowed band T _21minWith T _21max, middle tension force allowed band T _11minWith T _11max, backward pull allowed band T _10minWith T _10max

(c) through test, provide 1 ^#With 2 ^#The rigidity p-h curve of frame is obtained the minimum draught pressure P that is allowed when rigidity is constant _1min, P _2min

(d) set up the Mathematical Modeling that a cover reflects one-to-one relationship between planisher draught pressure and the percentage elongation:

$P=f(\mathrm{\&epsiv;},{\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="H2009100538403E00041.png,H2009100538403E00051.png"\; state="\{\{state\}\}">T</figure-callout>}}_1,T_0,B,H,{\mathrm{\&sigma;}}_s,D_w)$

$=\frac{({\mathrm{\&sigma;}}_s-\frac{T_0+{\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="H2009100538403E00041.png,H2009100538403E00051.png"\; state="\{\{state\}\}">T</figure-callout>}}_1}{2})\&CenterDot;H\&CenterDot;(1-\mathrm{\&epsiv;})}{\mathrm{\&mu;}}\left\{\exp \right\{\frac{\mathrm{\&mu;}\&CenterDot;\left\{\frac{1}{2}(a_1\ln \left(\mathrm{\&epsiv;}\right)+a_0)\right[\frac{D_w\mathrm{\&epsiv;\&mu;}}{2}+\sqrt{{\left(\frac{D_w\mathrm{\&epsiv;\&mu;}}{2}\right)}^2+2D_w\mathrm{H\&epsiv;}}\left]\right\}}{H(1-\mathrm{\&epsiv;})}\}-1\}B$

ε＝f ^-1(P，T ₁，T ₀，B，H，σ _s，D _w)

In the formula: the total draught pressure of P-;

The B-strip width;

D _w-frame work roll diameter;

σ _s-band yield strength;

T ₁-forward pull;

T ₀-backward pull;

H-frame inlet thickness

a ₀, a ₁-smooth steel grade and operating mode influence coefficient, wherein a ₀Value between 0 to 5, a ₁Between-5 to 5;

ε-band percentage elongation;

μ-coefficient of friction.

(e) utilize on-the-spot real data, set up the Mathematical Modeling of rolling milimeter number one-to-one relationship after a cover reflection work roll surface roughness and the roll change, $R{a}_r=R{a}_{r0}\&CenterDot;e^{B_L\&CenterDot;L};$ In the formula, Ra _rBe current rolling milimeter number bottom working roll surface roughness, Ra _R0For working roll initial surface roughness, L are the rolling milimeter number of working roll, B _LBe working roll roughness attenuation coefficient;

(f) set up the Mathematical Modeling that a cover reflects one-to-one relationship between finished strip roughness and planisher working roll initial roughness, band steel initial roughness, the rolling milimeter number of working roll, thickness of strip, the strength of materials and the percentage elongation:

$R{a}_{\mathrm{strip}}=g(R{a}_{\mathrm{strip}0},\mathrm{\&epsiv;},R{a}_r,L,H,{\mathrm{\&sigma;}}_s)$

$={\mathrm{\&eta;}}_1[1-{\mathrm{\&alpha;}}_h\left(\mathrm{H\&epsiv;}\right)-{{\mathrm{\&alpha;}}^{\&prime;}}_h{\left(\mathrm{H\&epsiv;}\right)}^2]e^{{\mathrm{\&alpha;}}_k{\mathrm{\&sigma;}}_s}{e}^{{\mathrm{\&alpha;}}_{\mathrm{\&epsiv;}}\mathrm{\&epsiv;}}R{a}_r{e}^{B_{L}L}+{\mathrm{\&eta;}}_2\mathrm{th}\left[{\mathrm{\&beta;}}_h\left(\mathrm{H\&epsiv;}\right)\right]e^{{\mathrm{\&beta;}}_k{\mathrm{\&sigma;}}_s}\mathrm{th}\left({\mathrm{\&beta;}}_{\mathrm{\&epsiv;}}\mathrm{\&epsiv;}\right)R{a}_{\mathrm{strip}0}$

$R{a}_{{\mathrm{strip}}_0}=g^{-1}(R{a}_{\mathrm{strip}},\mathrm{\&epsiv;},R{a}_r,L,H,{\mathrm{\&sigma;}}_s)$

In the formula: Ra _Strip-finished strip surface roughness;

Ra _Strip0-incoming band steel surface roughness;

Ra _r-work roll surface roughness;

α _h, α _{H '}The inlet thickness influence coefficient of-production board surface roughness heredity part mid frame band;

α _k, β _kThe material influence coefficient of-production board surface roughness heredity part and extention mid frame band;

α _ε, β _ε-production board surface roughness heredity part and extention mid frame reduction ratio influence coefficient;

β _hThe inlet thickness influence coefficient of-production board surface roughness extention mid frame band;

η ₁, η ₂-unit equipment properties influence parameter, η ₁, η ₂Span between 0.5～2.0,

(g) with P _2min, T _21max, T _11max, B, H, σ _s, D _W2Etc. relevant Mathematical Modeling shown in the parameter substitution step (d), obtain 2 from the housing rigidity angle ^#The minimum percentage elongation ε of the limit that frame allowed _2min

(h) with ε _2min, Ra _1min, L ₂, Ra _R2, H, σ _sRelevant Mathematical Modeling is obtained 2 shown in the substitution step (f) ^#In the time of will satisfying the roughness requirement of finished strip under the situation of the minimum percentage elongation of the frame employing limit, 1 ^#The guarantee value of frame outlet band steel roughness

(i) according to the percentage elongation margin of tolerance of band, calculate 2 ^#When frame adopts limit minimum percentage elongation, 1 ^#The limit elongation ε that frame should be born in theory _1min=σ _Max-ε _2min

(j) with ε _1min, T _10max, T _11max, B, H, σ _s, D _W1Etc. relevant Mathematical Modeling shown in the parameter substitution step (d), obtain corresponding 1 ^#The skin pass rolling pressure value P of frame ₁

(k) with ε _1min, Ra ₀, L ₁, H, σ _sRelevant Mathematical Modeling obtains 1 shown in the substitution step (f) ^#Frame is ε at percentage elongation _1minTime outlet band steel roughness

(l) judge inequality $\left\{\begin{array}{c}{P}_{}\end{array}\right.$ $\left\{\begin{array}{c}{}_1\&GreaterEqual;{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="H2009100538403E00041.png,H2009100538403E00051.png"\; state="\{\{state\}\}">P</figure-callout>}}_{1\mathrm{Min}}\\ R{a^{\&prime;}}_{\mathrm{Strip}01}\&GreaterEqual;R{a}_{\mathrm{Strip}01}\end{array}\right.$ Whether set up simultaneously, if inequality is set up simultaneously, then select big elongation control pattern, execution in step (m) is controlled according to big elongation control pattern; Otherwise, select little percentage elongation rolling mode, execution in step (n) is controlled according to little percentage elongation rolling mode;

(m) under big percentage elongation rolling mode, 1 ^#With 2 ^#Frame is used simultaneously;

(n) under little percentage elongation rolling mode, 1 ^#Machine frame rolling mill is not depressed rolling, working roll and intermediate calender rolls off-line.

Preferably, comprise in the said step (e):

E1), select m * n actual working roll initial surface roughness, rolling milimeter number and corresponding real work roll surface roughness sample { Ra according to the rolling data of reality _R0i, Ra _Rij, L _IjI=1,2 ..., m j=1,2 ..., n};

E2) the initial set value G of given object function ₀=1.0 * 10 ¹⁰, B _LStep-size in search is Δ B _L

E3) assignment procedure calculating parameter k ₁=1;

E4) make working roll roughness attenuation coefficient B _L=-1.0+k ₁Δ B _L

E5) construct the control corresponding functional expression: $F_{\mathrm{Ij}}\left(B_L\right)=|R{a}_{\mathrm{Rij}}-R{a}_{r0i}\&CenterDot;e^{B_L\&CenterDot;L_{\mathrm{Ij}}}|,$ And calculate corresponding F _Ij(B _L) value;

E6) construct corresponding target function type: $G\left(B_L\right)=\underset{i=1}{\overset{m}{\mathrm{\&Sigma;}}}\sqrt{\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{\left[F_{\mathrm{Ij}}\left(B_L\right)\right]}^2},$ And calculate respective objects function G (B _L) value;

E7) compare G (B _L) and G ₀Size, if inequality G (B _L)＜G ₀Set up, then G ₀=G (B _L), $B_L^{*}=B_L,$ k ₁=k ₁+ 1, execution in step e8); If inequality is false, make k ₁=k ₁+ 1, direct execution in step e8);

E8) judge inequality $K_{}$ ${}_1<\frac{1.0}{{\mathrm{\&Delta;\; B}}_L}$ Set up? Like inequality $K_{}$ ${}_1<\frac{1.0}{\mathrm{\&Delta;}{B}_L}$ Set up, then execution in step (e4); Otherwise execution in step (e9);

E9) provide $B_L=B_L^{*},$ The foundation of the Mathematical Modeling of rolling milimeter number one-to-one relationship after completion reflection work roll surface roughness and the roll change.

The present invention is owing to adopted above technical scheme; Make it compared with prior art; Have the following advantages and good effect: satisfy the demand of user, strengthen the adaptability of unit, reduce cost of investment to product to aspects such as product mechanical performance, surface quality; Give play to the potential of unit, improved usage ratio of equipment.

The method of the invention is simple and clear, is fit to online application.

Description of drawings

Fig. 1 is the The general frame of rolling mode control method of the present invention;

Fig. 2 is the Mathematical Modeling The general frame of rolling milimeter number one-to-one relationship after work roll surface roughness of the present invention and the roll change;

Fig. 3 is the rolling mode control method The general frame of two embodiment of the present invention;

Fig. 4 is the smooth housing rigidity P-h figure of two embodiment of the present invention.

The specific embodiment

Embodiment 1

Like Fig. 1, shown in 2,3, be 0.2*1020 with the specification, steel grade is that MR2T3 (being called for short No. 1 the ideal format product) is example.

Step 1: collect the device parameter of two-shipper frame planisher, mainly comprise: 1 ^#With 2 ^#The work roll diameter D of frame _W1=460mm, D _W2=460mm; 1 ^#With 2 ^#The working roll initial roughness Ra of frame _R1=0.8 μ m, Ra _R2=2.0 μ m; 1 ^#With 2 ^#The rolling milimeter number L of frame working roll ₁=100Km, L ₂=100Km.

Step 2: collect the crucial rolling technological parameter treat smooth product, for No. 1 ideal format product: thickness of strip H ₁=0.2mm, width B ₁=1020mm, material (intensity) σ _S1=292Mpa, percentage elongation allowed band ε _Min1=0.8% and ε _Max1=1.2%, target percentage elongation ε _o=1.0%, supplied materials roughness Ra ₀₁=1.2 μ m, finished product roughness allowed band Ra _1min1=0.6 μ m and Ra _1max1=0.8 μ m, finished product target roughness Ra _o=0.7 μ m, forward pull allowed band T _21min1=29Mpa and T _21max1=58Mpa, middle tension force allowed band T _11min1=58Mpa and T _11max1=116Mpa, backward pull allowed band T _10min1=29Mpa and T _10max1=58Mpa;

Step 3: as shown in Figure 4 through test, provide 1 ^#With 2 ^#The rigidity p-h curve of frame draws the minimum draught pressure P that is allowed when housing rigidity is constant _1min=52T; α is this section straight line inclination angle among the figure, the slope tg α of this straight line=Δ p/ Δ f.

Step 4:, the Mathematical Modeling of setting up one-to-one relationship between a cover reflection planisher draught pressure and the percentage elongation is following:

$P=f(\mathrm{\&epsiv;},{\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="H2009100538403E00041.png,H2009100538403E00051.png"\; state="\{\{state\}\}">T</figure-callout>}}_1,T_0,B,H,{\mathrm{\&sigma;}}_s,D_w)$

$=\frac{({\mathrm{\&sigma;}}_s-\frac{T_0+{\mathrm{<figure-callout\; id="1"\; label="T"\; filenames="H2009100538403E00041.png,H2009100538403E00051.png"\; state="\{\{state\}\}">T</figure-callout>}}_1}{2})\&CenterDot;H\&CenterDot;(1-\mathrm{\&epsiv;})}{\mathrm{\&mu;}}\left\{\exp \right\{\frac{\mathrm{\&mu;}\&CenterDot;\left\{\frac{1}{2}(a_1\ln \left(\mathrm{\&epsiv;}\right)+a_0)\right[\frac{D_w\mathrm{\&epsiv;\&mu;}}{2}+\sqrt{{\left(\frac{D_w\mathrm{\&epsiv;\&mu;}}{2}\right)}^2+2D_w\mathrm{H\&epsiv;}}\left]\right\}}{H(1-\mathrm{\&epsiv;})}\}-1\}B$

In the formula:

The total draught pressure of P-;

The B-strip width;

D _w-frame work roll diameter;

σ _s-band yield strength;

T ₁-forward pull;

T ₀-backward pull;

H-frame inlet thickness;

a ₀, a ₁-smooth steel grade and operating mode influence coefficient, wherein a ₀Value between 0 to 5, a ₁Between-5 to 5;

ε-band percentage elongation;

μ-coefficient of friction.

Step 5: the basic function that constructs between roll surface roughness and rolling milimeter number, the roll initial surface roughness concerns as follows: $R{a}_r=R{a}_{r0}\&CenterDot;e^{B_L\&CenterDot;L}$ (in the formula, Ra _rBe current rolling milimeter number bottom working roll surface roughness, Ra _R0For working roll initial surface roughness, L are the rolling milimeter number of working roll, B _LBe working roll roughness attenuation coefficient);

Step 6:, select working roll initial surface roughness, rolling milimeter number and the corresponding real work roll surface roughness sample { Ra of 30 * 100 reality according to the actual rolling data in scene _R0i, Ra _Rij, L _IjI=1,2 ..., 30 j=1,2 ..., 100};

Step 7: the initial set value G of given object function ₀=1.0 * 10 ¹⁰, B _LStep-size in search is Δ B _L=0.0001;

Step 8: assignment procedure calculating parameter k ₁=1;

Step 9: make working roll roughness attenuation coefficient B _L=-1+k ₁Δ B _L=-0.9999;

Step 10: construct the control corresponding functional expression: $F_{\mathrm{Ij}}\left(B_L\right)=|R{a}_{\mathrm{Rij}}-R{a}_{r0i}\&CenterDot;e^{B_L\&CenterDot;L_{\mathrm{Ij}}}|,$ And calculate corresponding F _Ij(B _L) value be 32.62;

Step 11: construct corresponding target function type: $G\left(B_L\right)=\underset{i=1}{\overset{m}{\mathrm{\&Sigma;}}}\sqrt{\underset{j=1}{\overset{n}{\mathrm{\&Sigma;}}}{\left[F_{\mathrm{Ij}}\left(B_L\right)\right]}^2},$ And calculate respective objects function G (B _L) value be 2956.2;

Step 12: compare G (B _L)=2956.2 and G ₀=1.0 * 10 ¹⁰Size.If obvious inequality G (B _L)＜G ₀Set up, then G ₀=G (B _L)=2956.2, $B_L^{*}=B_L=0.1,$ k ₁=k ₁+ 1=2, execution in step 13;

Step 13: judge inequality $K_{}$ ${}_1=2<\frac{1.0}{\mathrm{\&Delta;}{B}_L}=10000$ Set up? Obviously, inequality $K_{}$ ${}_1<\frac{1.0}{\mathrm{\&Delta;}{B}_L}$ Set up, then change step 9 over to; Otherwise, execution in step 14;

Step 14: provide $B_L=B_L^{*}=-0.0023,$ The foundation of the Mathematical Modeling of rolling milimeter number one-to-one relationship, i.e. Ra after completion reflection work roll surface roughness and the roll change _r=Ra _R0E ^-0.0023L

Step 15: the Mathematical Modeling of setting up one-to-one relationship between a cover reflection finished strip roughness and planisher working roll initial roughness, band steel initial roughness, the rolling milimeter number of working roll, thickness of strip, the strength of materials and the percentage elongation is following:

$R{a}_{\mathrm{strip}}=0.576\&CenterDot;(1-0.107\&times;{10}^3\&CenterDot;h-0.0212\&times;{10}^6\&CenterDot;H^2)\&CenterDot;e^{(2.18\&times;{10}^{-10}\&CenterDot;{\mathrm{\&sigma;}}_s)}\&CenterDot;e^{(-121.6\&CenterDot;\mathrm{\&epsiv;})}\&CenterDot;R{a}_{\mathrm{strip}0}$

$+1.183\&CenterDot;\mathrm{th}(1.24\&times;{10}^3\&CenterDot;H)\&CenterDot;e^{(-3.25\&times;{10}^{-10}\&CenterDot;{\mathrm{\&sigma;}}_s)}\&CenterDot;\mathrm{th}(1.792\&times;10\&CenterDot;\mathrm{\&epsiv;})R{a}_r\&CenterDot;e^{-0.0023\&CenterDot;L}$

Step 16: with the related process parameter P of No. 1 ideal format product _2min1, T _21max1, T _11max1, B ₁, H ₁, σ _S1, D _W2Relevant Mathematical Modeling obtains 2 from the housing rigidity angle shown in the substitution step 4 ^#The minimum percentage elongation ε of the limit that frame allowed _2min1=0.15%;

Step 17: according to the requirement of band steel finished product roughness, with the related process parameter ε of No. 1 ideal format product _2min1, Ra _1min1, L ₂, Ra _R2, H ₁, σ _S1Relevant Mathematical Modeling is obtained 2 shown in the substitution step 15 ^#Planisher the 1st when frame adopts the roughness that will satisfy finished strip under the situation of the minimum percentage elongation of the limit to require ^#The guarantee value of frame outlet band steel roughness $R{a}_{s{\mathrm{Trip}}_{01}1}=0.72\mathrm{\&mu;\; m};$

Step 18:, calculate No. 1 ideal format product when 2 according to the percentage elongation margin of tolerance of band ^#When frame adopts the minimum percentage elongation of the limit 1 ^#The limit elongation ε that frame should be born in theory _1min1=1.15%;

Step 19: with the related process parameter ε of No. 1 ideal format product _1min1, T _10max1, T _11max1, B ₁, H ₁, σ _S1, D _W1Deng relevant Mathematical Modeling shown in the substitution step 4, obtain corresponding 1 ^#The skin pass rolling pressure value P of frame ₁=570t;

Step 20: with the related process parameter ε of No. 1 ideal format product _1min1, Ra ₀₁, L ₁, H ₁, σ _S1Relevant Mathematical Modeling obtains 1 shown in the substitution step 15 ^#Frame is ε at percentage elongation _1min1Time outlet band steel roughness $R{a^{\&prime;}}_{{\mathrm{Strip}}_{01}1}=0.8\mathrm{\&mu;\; m};$

Step 21: judge inequality $\left\{\begin{array}{c}{P}_{}\end{array}\right.$ $\left\{\begin{array}{c}{}_1\&GreaterEqual;{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="H2009100538403E00041.png,H2009100538403E00051.png"\; state="\{\{state\}\}">P</figure-callout>}}_{1\mathrm{Min}}\\ R{a^{\&prime;}}_{\mathrm{Strip}0}\&GreaterEqual;R{a}_{\mathrm{Strip}0}\end{array}\right.$ Whether set up simultaneously.Obvious No. 1 ideal format product satisfies inequality $\left\{\begin{array}{c}{P}_{}\end{array}\right.$ $\left\{\begin{array}{c}{}_1\&GreaterEqual;{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="H2009100538403E00041.png,H2009100538403E00051.png"\; state="\{\{state\}\}">P</figure-callout>}}_{1\mathrm{Min}}\\ R{a^{\&prime;}}_{{\mathrm{Strip}}_{01}1}\&GreaterEqual;R{a}_{{\mathrm{Strip}}_{01}1}\end{array}\right.,$ So select big percentage elongation rolling mode, execution in step 22 is controlled according to the big percentage elongation rolling mode of two-shipper frame planisher, and promptly 1# and 2# planisher adopt big percentage elongation rolling mode simultaneously.

The finished product roughness that adopts the method for the invention and employing conventional method and obtain and the contrast situation of percentage elongation.As shown in table 1; Compare with the employing conventional method; Utilize its actual roughness departure of the method for the invention from 11.43% drop to 1.43%, the elongation control error drops to 2% from 19%, improved the surface quality and the mechanical performance of finished product greatly, reached engine request.

Table 1 the method for the invention and conventional method gained finished product roughness and percentage elongation contrast

	Actual roughness (μ m)	Target roughness (μ m)	Error amount (%)	Actual percentage elongation (%)	Target percentage elongation (%)	Error amount (%)
							Result of the present invention	0.71	0.7	1.43	0.98	1.0	2
Conventional method result	0.62	0.7	11.43	0.81	1.0	19

Embodiment 2

Like Fig. 1, shown in 2,3, be 0.5*800 with the specification, steel grade is that IF steel (being called for short No. 2 the ideal format product) is example.

Step 1: consistent with embodiment 1.

Step 2: collect the crucial rolling technological parameter treat smooth product, for No. 2 ideal format products: thickness of strip H ₂=0.5mm, width B ₂=800mm, material (intensity) σ _S2=160Mpa, percentage elongation allowed band ε _Min2=0.5% and ε _Max2=0.6%, target percentage elongation ε _o=0.55%, supplied materials roughness Ra ₀₂=1.5 μ m, finished product roughness allowed band Ra _1min2=1.0 μ m and Ra _1max2=1.2 μ m, finished product target roughness Ra _o=1.1 μ m, forward pull allowed band T _21min2=16Mpa and T _21max2=32Mpa, middle tension force allowed band T _11min2=32Mpa and T _11max2=64Mpa, backward pull allowed band T _10min2=16Mpa and T _10max2=32Mpa;

Step 3: as shown in Figure 4 through test, provide 1 ^#With 2 ^#The rigidity p-h curve of frame draws the minimum draught pressure P that is allowed when housing rigidity is constant _1min=52T;

Step 5-step 15 is consistent with embodiment 1;

Step 16: with the related process parameter P of No. 2 ideal format products _2min2, T _21max2, T _11max2, B ₂, H ₂, σ _S2, D _W2Relevant Mathematical Modeling obtains 2 from the housing rigidity angle shown in the substitution step 4 ^#The minimum percentage elongation ε of the limit that frame allowed _2min2=0.42%;

Step 17: according to the requirement of band steel finished product roughness, with the related process parameter ε of No. 2 ideal format products _2min2, Ra _1min2, L ₂, Ra _R2, H ₂, σ _S2Relevant Mathematical Modeling obtains 2 shown in the substitution step 15 ^#Planisher the 1st when frame adopts the roughness that will satisfy finished strip under the situation of the minimum percentage elongation of the limit to require ^#The guarantee value of frame outlet band steel roughness $R{a}_{{\mathrm{Strip}}_{01}2}=0.93\mathrm{\&mu;\; m};$

Step 18:, calculate No. 2 ideal format products when 2 according to the percentage elongation margin of tolerance of band ^#When frame adopts the minimum percentage elongation of the limit 1 ^#The limit elongation ε that frame should be born in theory _1min2=0.18%;

Step 19: with the related process parameter ε of No. 2 ideal format products _1min2, T _10max2, T _11max2, B ₂, H ₂, σ _S2, D _W1Deng relevant Mathematical Modeling shown in the substitution step 4, obtain corresponding 1 ^#The skin pass rolling pressure value P of frame ₁=13.2t;

Step 20: with the related process parameter ε of No. 2 ideal format products _1min2, Ra ₀₂, L ₁, H ₂, σ _S2Relevant Mathematical Modeling obtains 1 shown in the substitution step 15 ^#Frame is ε at percentage elongation _1min2Time outlet band steel roughness $R{a^{\&prime;}}_{{\mathrm{Strip}}_{01}2}=0.61\mathrm{\&mu;\; m};$

Step 21: judge inequality $\left\{\begin{array}{c}{P}_{}\end{array}\right.$ $\left\{\begin{array}{c}{}_1\&GreaterEqual;{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="H2009100538403E00041.png,H2009100538403E00051.png"\; state="\{\{state\}\}">P</figure-callout>}}_{1\mathrm{Min}}\\ R{a^{\&prime;}}_{\mathrm{Strip}0}\&GreaterEqual;{\mathrm{Ra}}_{\mathrm{Strip}0}\end{array}\right.$ Whether set up simultaneously.For No. 2 ideal format products, obvious inequality $\left\{\begin{array}{c}{P}_{}\end{array}\right.$ $\left\{\begin{array}{c}{}_1\&GreaterEqual;{\mathrm{<figure-callout\; id="1"\; label="P"\; filenames="H2009100538403E00041.png,H2009100538403E00051.png"\; state="\{\{state\}\}">P</figure-callout>}}_{1\mathrm{Min}}\\ R{a^{\&prime;}}_{{\mathrm{Strip}}_{01}2}\&GreaterEqual;R{a}_{{\mathrm{Strip}}_{01}2}\end{array}\right.$ Be false, so just select little percentage elongation rolling mode, execution in step 23 is controlled according to little percentage elongation rolling mode, and 1# frame six-high cluster mill is not depressed rolling, working roll and intermediate calender rolls off-line.

The finished product roughness that adopts the method for the invention and employing conventional method and obtain and the contrast situation of percentage elongation.As shown in table 2; Compare with the employing conventional method; Utilize its actual roughness departure of the method for the invention from 29.1% drop to 1.82%, the elongation control error drops to 5.5% from 32.7%, improved the surface quality and the mechanical performance of finished product greatly, reached engine request.Special, can find out through table 2, adopt conventional method and the finished product roughness and the percentage elongation that obtain have surpassed the desired limiting value of user, in fact become waste product.

Table 2 the method for the invention and conventional method gained finished product roughness and percentage elongation contrast

	Actual roughness (μ m)	Target roughness (μ m)	Error amount (%)	Actual percentage elongation (%)	Target percentage elongation (%)	Error amount (%)
							Result of the present invention	1.08	1.1	1.82	0.52	0.55	5.5
Conventional method result	1.42	1.1	29.1	0.73	0.55	32.7

Claims (2)

1. the control method of a rolling mode of pinch pass mill set is used to control 1 of smooth unit ^#With 2 ^#Frame is characterized in that may further comprise the steps:

(a) the capital equipment parameter of the smooth unit of collection: 1 ^#With 2 ^#Frame work roll diameter D _W1, D _W2, 1 ^#With 2 ^#Frame working roll initial roughness Ra _R1, Ra _R2, 1 ^#With 2 ^#The rolling milimeter number L of frame working roll ₁, L ₂

(b) collect the crucial rolling technological parameter of treating smooth product: thickness of strip H, width B, strength of materials σ _s, percentage elongation allowed band ε _MinWith ε _Max, supplied materials roughness Ra ₀, finished product roughness allowed band Ra _1minWith Ra _1max, forward pull allowed band T _21minWith T _21max, middle tension force allowed band T _11minWith T _11max, backward pull allowed band T _10minWith T _10max

(c) through test, provide 1 ^#With 2 ^#The rigidity p-h curve of frame is obtained the minimum draught pressure P that is allowed when rigidity is constant _1min, P _2min

(d) set up the Mathematical Modeling that a cover reflects one-to-one relationship between planisher draught pressure and the percentage elongation:

$P=f(\mathrm{\&epsiv;},T_1,T_0,B,H,{\mathrm{\&sigma;}}_{\mathrm{\&epsiv;}},D_w)$

$=\frac{({\mathrm{\&sigma;}}_s-\frac{T_0+T_1}{2})\&CenterDot;H\&CenterDot;(1-\mathrm{\&epsiv;})}{\mathrm{\&mu;}}\left\{\exp \right\{\frac{\mathrm{\&mu;}\&CenterDot;\left\{\frac{1}{2}(a_1\ln \left(\mathrm{\&epsiv;}\right)+a_0)\right[\frac{D_w\mathrm{\&epsiv;\&mu;}}{2}+\sqrt{{\left(\frac{\mathrm{D\&epsiv;\&mu;}}{2}\right)}^2+2\mathrm{DH\&epsiv;}}\left]\right\}}{H(1-\mathrm{\&epsiv;})}\}-1\}B$

ε＝f ^-1(P，T ₁，T ₀，B，H，σ _s，D _w)；

In the formula: the total draught pressure of P-;

The B-strip width;

D _w-frame work roll diameter;

σ _s-band yield strength;

T ₁-forward pull;

T ₀-backward pull;

H-frame inlet thickness;

a ₀, a ₁-smooth steel grade and operating mode influence coefficient, wherein a ₀Value between 0 to 5, a ₁Between-5 to 5;

ε-band percentage elongation;

μ-coefficient of friction;

(e) utilize on-the-spot real data, set up the Mathematical Modeling of rolling milimeter number one-to-one relationship after a cover reflection work roll surface roughness and the roll change,

In the formula, Ra _rBe current rolling milimeter number bottom working roll surface roughness, Ra _R0For working roll initial surface roughness, L are the rolling milimeter number of working roll, B _LBe working roll roughness attenuation coefficient;

(f) set up the Mathematical Modeling that a cover reflects one-to-one relationship between finished strip roughness and planisher working roll initial roughness, band steel initial roughness, the rolling milimeter number of working roll, thickness of strip, the strength of materials and the percentage elongation:

${\mathrm{Ra}}_{\mathrm{strip}}=g({\mathrm{Ra}}_{\mathrm{strip}0},\mathrm{\&epsiv;},{\mathrm{Ra}}_r,L,H,{\mathrm{\&sigma;}}_s)$

$={\mathrm{\&eta;}}_1[1-{\mathrm{\&alpha;}}_h\left(\mathrm{H\&epsiv;}\right)-{{\mathrm{\&alpha;}}^{\&prime;}}_h{\left(\mathrm{H\&epsiv;}\right)}^2]e^{{\mathrm{\&alpha;}}_k{\mathrm{\&sigma;}}_s}{e}^{{\mathrm{\&alpha;}}_{\mathrm{\&epsiv;}}\mathrm{\&epsiv;}}{\mathrm{Ra}}_r{e}^{B_{L}L}+{\mathrm{\&eta;}}_2\mathrm{th}\left[{\mathrm{\&beta;}}_h\left(\mathrm{H\&epsiv;}\right)\right]e^{{\mathrm{\&beta;}}_k{\mathrm{\&sigma;}}_s}\mathrm{th}\left({\mathrm{\&beta;}}_{\mathrm{\&epsiv;}}\mathrm{\&epsiv;}\right){\mathrm{Ra}}_{\mathrm{strip}0}$

${\mathrm{Ra}}_{{\mathrm{strip}}_0}=g^{-1}({\mathrm{Ra}}_{\mathrm{strip}},\mathrm{\&epsiv;},R{a}_r,L,H,{\mathrm{\&sigma;}}_s);$

In the formula: Ra _Strip-finished strip surface roughness;

Ra _Strip0-incoming band steel surface roughness;

Ra _r-work roll surface roughness;

α _h, α _{H '}The inlet thickness influence coefficient of-production board surface roughness heredity part mid frame band;

α _k, β _kThe material influence coefficient of-production board surface roughness heredity part and extention mid frame band;

α _ε, β _ε-production board surface roughness heredity part and extention mid frame reduction ratio influence coefficient;

β _hThe inlet thickness influence coefficient of-production board surface roughness extention mid frame band;

η ₁, η ₂-unit equipment properties influence parameter, η ₁, η ₂Span is between 0.5～2.0;

(g) with P _2min, T _21max, T _11max, B, H, σ _s, D _W2Etc. relevant Mathematical Modeling shown in the parameter substitution step (d), obtain 2 from the housing rigidity angle ^#The minimum percentage elongation ε of the limit that frame allowed _2min

(h) with ε _2min, Ra _1min, L ₂, Ra _R2, H, σ _sRelevant Mathematical Modeling is obtained 2 shown in the substitution step (f) ^#In the time of will satisfying the roughness requirement of finished strip under the situation of the minimum percentage elongation of the frame employing limit, 1 ^#The guarantee value of frame outlet band steel roughness

(i) according to the percentage elongation margin of tolerance of band, calculate 2 ^#When frame adopts limit minimum percentage elongation, 1 ^#The limit elongation ε that frame should be born in theory _1min=ε _Max-ε _2min

(j) with ε _1min, T _10max, T _11max, B, H, σ _s, D _W1Etc. relevant Mathematical Modeling shown in the parameter substitution step (d), obtain corresponding 1 ^#The skin pass rolling pressure value P of frame ₁

(k) with ε _1min, Ra ₀, L ₁, H, σ _sRelevant Mathematical Modeling obtains 1 shown in the substitution step (f) ^#Frame is ε at percentage elongation _1minTime outlet band steel roughness

(l) judge inequality $\left\{\begin{array}{c}{P}_1\&GreaterEqual;P_{1\mathrm{Min}}\\ {{\mathrm{Ra}}^{\&prime;}}_{\mathrm{Strip}01}\&GreaterEqual;{\mathrm{Ra}}_{\mathrm{Strip}01}\end{array}\right.$ Whether set up simultaneously, if inequality is set up simultaneously, then select big elongation control pattern, execution in step (m) is controlled according to big elongation control pattern; Otherwise, select little percentage elongation rolling mode, execution in step (n) is controlled according to little percentage elongation rolling mode; Wherein, P ₁Be 1 ^#The skin pass rolling force value of frame;

(m) under big percentage elongation rolling mode, 1 ^#With 2 ^#Frame is used simultaneously;

(n) under little percentage elongation rolling mode, 1 ^#Machine frame rolling mill is not depressed rolling, working roll and intermediate calender rolls off-line.

2. the control method of rolling mode of pinch pass mill set as claimed in claim 1 is characterized in that: comprise in the said step (e):

E1), select m * n actual working roll initial surface roughness, rolling milimeter number and corresponding real work roll surface roughness sample { Ra according to the rolling data of reality _R0i, Ra _Rij, L _IjI=1,2 ..., m j=1,2 ..., n};

E2) the initial set value G of given object function ₀=1.0 * 10 ¹⁰, B _LStep-size in search is Δ B _L

E3) assignment procedure calculating parameter k ₁=1;

E4) make working roll roughness attenuation coefficient B _L=-1.0+k ₁Δ B _L

E5) construct the control corresponding functional expression: And calculate corresponding F _Ij(B _L) value;

E6) construct corresponding target function type: And calculate respective objects function G (B _L) value;

E7) compare G (B _L) and G ₀Size, if inequality G (B _L)＜G ₀Set up, then G ₀=G (B _L),

k ₁=k ₁+ 1, execution in step e8); If inequality is false, make k ₁=k ₁+ 1, direct execution in step e8);

E8) do you judge that inequality

sets up? Set up like inequality

, then execution in step (e4); Otherwise execution in step (e9);

E9) provide

and accomplish the foundation of the Mathematical Modeling of rolling milimeter number one-to-one relationship after reflection work roll surface roughness and the roll change.

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