CN101214501A - Working roll consideration to strip steel convexity, edge drop control and abrasion control and using method - Google Patents

Abstract

The invention provides a working roll provided with three functions of convexity control, edge-dropping control and abrasion control and a use method. The working roll has three roll shapes of convexity control segment, edge-dropping and abrasion control segment and structural and technological segment that are identified by three formulas. If the working roll of the invention and a cooperative use method are adopted, the size of band steel edge-dropping area and the amount of edge dropping will be greatly decreased, which are favorable for the decreasing of whole convexity, which is also known as lateral thickness difference. The invention evidently improves the rate of low-convexity band steel. Industrial tests show that the rate of band steel outlet convexity, C 40 of which is less than 52 Mu m, increases form 13.7 per cent to 81.25 per cent after rolling. In addition, the invention effectively controls the quantity of over-standard coil. The rate of band steel with convexity more than 60 Mu m drops to 6.60 percent from 65.6 per cent. When the working roll provided by the invention is not only for stable industrial application, but for continuous and overall application, the rate of on-oriented steel with the size of 2.3mm multiplied by 1050mm will increase from 42.05 per cent to 93.15 percent, which is beneficial to popularizing.

Description

The working roll and the using method of control and wear control falls in consideration to strip steel convexity, limit

Technical field

The present invention relates to be used in a kind of wide steel strip hot continuous mill production the working roll of plate shape control and the using method of this working roll.

Background technology

In the wide steel strip hot rolling production,, will inevitably produce the whole convexity of bigger band steel owing to reasons such as initial roll forming, roll flexural deformation, hot convexity, wearing and tearing.Simultaneously, working roll fluted body " ∪ " wearing and tearing that the downstream frame is serious often cause rolling unit intermediary and later stages strip profile bigger than normal, and especially the limit falls significantly, and rolled band steel piece number reduces in the rolling unit thereby make, and strip profile and limit fall and be difficult to control.The key of continuous hot-rolling mill plate shape control just is that the downstream frame must have the dual capability of convexity control and wear control.In order to improve the hot-rolled finished product lateral thickness difference, improve band steel lumber recovery, all kinds of milling trains or technology are arisen at the historic moment.At present, mainly contain following method in the particularly tropical steel plate shape control of plate shape control field: CVC milling train, K-WRS milling train, high-speed steel working roll, lubrication and rolling, online grinding roller technology etc.Wherein:

(1) CVC milling train (with reference to Fig. 1).CVC is the abbreviation of Continuously Variable Crown, is a kind of continuous variable convex technology, is succeeded in developing by German SMS Schloemann-Siemag.CVC roll forming of the roll design is the key of this technology, and its roll shape curve is approximate doleiform, and up-down rollers is identical, dresses up one positive one instead, 180 ° each other, constitutes S shape roll gap.Axially scurry the purpose that in-migration reaches the positive and negative convexity of the empty roll gap of continuous variation by special S shape working roll.By axial reverse mobile top and bottom rolls, just can realize that roll crown changes and control continuously.Regulate the twitch direction and the distance of CVC roll, just can regulate the positive and negative of original roll crown and size, be equivalent to a pair roller and have variable original roll crown.Therefore, utilization is taken out roller and can be continuously changed roll gap shape (convexity), and the convexity that is equivalent to working roll can continuously change.In continuous hot-rolling mill downstream frame, CVC has the convexity control ability, but does not have the wear control ability, and causes the roll self-preservation to degenerate in downstream frame working roll heavy wear, and influences the performance of its convexity control ability.

(2) PC milling train (with reference to Fig. 2) is the shape that changes roll gap by the angle of the crossing θ that adjusts upper and lower working roll and support roller roller system, with the transverse gage distribution and the plate shape of control rolled piece.Normal angle of the crossing θ when rolling of PC milling train≤1.0 °.Change very little θ and just can obtain very big roll gap convexity variation, its rule is that angle of the crossing θ becomes greatly, and the roll gap convexity reduces.The roll of PC milling train intersection in pairs has the convexity control ability, but does not have the wear control ability.

(3) K-WRS milling train (with reference to Fig. 3).Hitachi and Kawasaki by Japan develop jointly out, are commonly referred to as the K-WRS milling train, are called for short the WRS milling train.This milling train adopts the long stroke roll shifting of routine work roller roll forming appropriateness to disperse the roll uneven wear, not only the working roll concentrated wear obviously improves, help reducing strip profile and the limit falls, and to a certain degree alleviated the working roll overall wear and can increase rolling output and the mill length of identical general steel rolling unit, but because hot continuous rolling silicon steel rolling unit is more remarkable than the roll wear of other unit, more serious at rolling later stage roll wear, particularly in appearance " box-shaped " worn area and after local " cat ear " wearing and tearing occurring near strip edge portion, very easily cause strip edge to fall significantly, convexity increases.In continuous hot-rolling mill downstream frame, WRS has the wear control ability, but does not have the convexity control ability.

(4) high-speed steel working roll.In the wide steel strip hot continuous mill production process, the working roller abrasion that influences the control of silicon steel plate shape is very outstanding, and is difficult to control.The high-speed steel working roll has increased the wearability of roll, external as company of Japanese Nippon Steel, domestic as the uneven wear problem by employing high-speed steel working roll solution working roll such as Baosteel, Wuhan Iron and Steel Plant, Ma Gang.But high-speed steel roll is used ripe in continuous hot-rolling mill upstream frame, in the more serious downstream frame of wearing and tearing also in exploration practice, and high-speed steel working roll cost height, anti-accident ability is relatively poor, is easy to generate and peels off.The high-speed steel working roll has the wear control ability, has alleviated but does not fundamentally solve a hot rolling working roll wear control difficult problem, does not have convexity control function.

(4) lubrication and rolling.Baosteel 2050 has begun this technical scheme of further exploration practice equally, test finds to adopt common working roll+lubrication and rolling roll wear equal loss further to descend 30%, and adopts high-speed steel working roll+lubrication and rolling roll wear equal loss can descend 10%.Japan uses lubrication and rolling when high yield steel mill adopts the high-speed steel working roll in hot rolling, and the plate shape control effect of silicon steel plate is obvious.Lubrication and rolling then needs to adopt a cover oil supply system, makes to build and the application cost increase.This technology has the wear control ability, has better alleviated but does not fundamentally solve a hot rolling working roll wear control difficult problem, does not have convexity control function.

(5) online grinding roller technology.Just at hot continuous rolling downstream frame serious wear, the rolling cycle, limited this problem proposed online grinding roller technology (On-Line Roll Grinder is called for short " ORG ").So-called " online grinding roller technology " is meant in the operation of rolling and can breaker roll carries out reconditioning and the new technology that need not it is removed from milling train.It can be to the grinding of the work roll surface property revised in the operation of rolling, alleviates and eliminates wearing and tearing and blemish in the operation of rolling, thereby improve the self-sustaining shape and the milling train plate shape control ability of roll forming, improves strip surface quality.Mitsubishi Heavy Industries Ltd begin ORG and OPM (the On-line rollProfile Meter that exploitation mainly matches with PC (Pair Cross) milling train from the eighties in 20th century, the roll on-line measuring device), successively be applied to the affiliated hot rolling mill of companies such as Nippon Steel, Kawasaki Steel, NKK, Korea S's Pu item.Domestic Baosteel 1580 continuous hot-rolling mills, 1780 continuous hot-rolling mills of Anshan iron and steel plant have been introduced this complete equipment.The Hitachi since the nineties, has released the online Burnisher apparatus that it adopts cubic boron nitride (CBN) emery wheel from eighties of last century, and Burnisher apparatus itself has online measuring ability, and has obvious superiority at aspects such as vibration resistance, grinding controls.The online Burnisher apparatus of hot rolling of Germany SMS (Schloemann-Siemag) company also has certain representativeness.Online Burnisher apparatus is directly installed on the rolling-mill housing, can appropriateness eliminate the local uneven wear of roll, but not have convexity control function.

Summary of the invention

The object of the present invention is to provide a kind of roll that adapts to wide steel strip hot continuous mill, a large amount of especially for having with the working roll of the rolling downstream frame of wide products such as silicon steel rolling, serious wear and the using method of this working roll.This working roll and cooperate the using method of this roller to have the triple function that control and wear control fall in convexity control, limit.

The objective of the invention is to be achieved by the following scheme:

The control and the working roll of wear control fall in a kind of consideration to strip steel convexity, limit, and described working roll is pressed length direction and is made up of three parts, i.e. convexity control section length L ₁, the limit falls and wear control segment length L ₂, structural manufacturing process segment length L ₃

Determine convexity control section length L ₁The roll forming equation of part is:

$y=\frac{H_C}{1-\sin (\mathrm{\π}/2-\mathrm{\β})}\×\sin (2\mathrm{\βx}/\mathrm{Lw}+\mathrm{\π}/2-\mathrm{\β}),(x\∈[0,L_1\left)\right)$

Determine that the limit falls and wear control segment length L ₂The roll forming equation of part is:

y＝a ₀+a ₂(x-L ₁) ²+a ₄(x-L ₁) ⁴+a ₆(x-L ₁) ⁶ (x∈[L ₁，L ₁+L ₂])

Determine structural manufacturing process segment length L ₃The roll forming equation of part is:

y＝b ₀+b ₁(x-L ₁-L ₂) (x∈(L ₁+L ₂，L _w])

Wherein,

H _CBenchmark convexity for working roll;

β is roll forming adjustment of features angle, β ∈ (0, pi/2];

Lw is the working roll barrel length;

B is a strip width;

a ₂, a ₄, a ₆Be the compensated curve characteristic coefficient;

In the formula, L ₁Be convexity control section length, ${\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="S2007101690292E00021.png,S2007101690292E00031.png"\; state="\{\{state\}\}">L</figure-callout>}}_1=\frac{L_w}{2}+\frac{B}{2}+S_{\mathrm{st}};$

In the formula, L ₂For the limit falls and wear control segment length, L ₂=S _End-S _St

$a_0=\frac{H_C}{1-\sin (\mathrm{\&pi;}/2-\mathrm{\&beta;})}\&times;\sin (2\mathrm{\&beta;}{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="S2007101690292E00021.png,S2007101690292E00031.png"\; state="\{\{state\}\}">L</figure-callout>}}_1/\mathrm{Lw}+\mathrm{\&pi;}/2-\mathrm{\&beta;})$

b ₀＝a ₀+a ₂L ² ₂+a ₄L ⁴ ₂+a ₆L ⁶ ₂

b ₁＝2a ₂L ₂+4a ₄L ³ ₂+6a ₆L ⁵ ₂

S _StBe rolling first band working roll putting position during steel;

S _EndWorking roll putting position during for rolling last piece band steel.

The using method of aforementioned working roll is preferably with axial folk prescription and is used to irreversible roll shifting, the axial roll shifting range of described working roll s ∈ [40mm, 400mm], and the roll shifting step-length is sp ∈ [0mm, 10mm].

Control and wear control ability fall in the control of non-orientation silicon steel convexity, the limit of adopting the using method of working roll of the present invention and this working roll obviously to improve continuous hot-rolling mill, be used for the large-scale industrial production non-orientation silicon steel, obtained the stable control effect that quality in kind significantly improves, also can be used for the control of directional silicon steel shape, the low rolling and free regulation rolling of convexity of hot-strip, therefore be beneficial to and apply.

Description of drawings

Fig. 1 is the axial roll shifting continuously variable crown of a CVC milling train shape of working roll schematic diagram;

Fig. 2 becomes the conventional plain-barreled roll schematic diagram of convexity for the PC milling train intersects;

The conventional plain-barreled roll schematic diagram of the long stroke roll shifting of Fig. 3 WRS milling train;

Fig. 4 working roll contour structures of the present invention schematic diagram;

Fig. 5 shape of working roll curve synoptic diagram of the present invention;

Fig. 6 is a working roller abrasion computation model schematic diagram;

Fig. 7 is the sinusoidal and parabola shape of working roll curve synoptic diagram of working roll;

Fig. 8 is a shape of working roll adjustment of features angle β implication schematic diagram;

Fig. 9 shape of working roll compensated curve characteristic coefficient is determined schematic diagram.

The specific embodiment

Elaborate embodiments of the present invention below in conjunction with accompanying drawing.

The specific embodiment one:

Present embodiment provides a kind of a kind of consideration to strip steel convexity, limit of using when utilizing the low grade non-oriented silicon steel of the rolling 2.3mm * 1050mm of 1700 continuous hot-rolling mills to fall the working roll of control and wear control.

1700 continuous hot-rolling mill F5 frame working roll barrel lengths are 2000mm, the barrel diameter scope of application is 760mm～700mm, upper and lower shape of working roll curve is identical, but reverse 180 ° of placements, be referred to as the asymmetric self compensation working roll of ASR-Y (asymmetry self-compensating work rolls for Yrolling campaign) here.

With the top working roll is example, and the ASR-Y top working roll is pressed length direction and is made up of three parts, i.e. convexity control section length L ₁, the limit falls and wear control segment length L ₂, structural manufacturing process segment length L ₃(with reference to Fig. 4);

The equation of determining each section roll shape curve is as follows:

Convexity control section length L ₁The roll forming equation of part is:

Equation 1: $y=\frac{H_c}{1-\sin (\mathrm{\&pi;}/2-\mathrm{\&beta;})}\&times;\sin (2\mathrm{\&beta;x}/\mathrm{Lw}+\mathrm{\&pi;}/2-\mathrm{\&beta;}),(x\&Element;[0,L_1\left)\right)$

The limit falls and wear control segment length L ₂The roll forming equation of part is:

Equation 2:y=a ₀+ a ₂(x-L ₁) ²+ a ₄(x-L ₁) ⁴+ a ₆(x-L ₁) ⁶(x ∈ [L ₁, L ₁+ L ₂])

Structural manufacturing process segment length L ₃The roll forming equation of part is:

Equation 3:y=b ₀+ b ₁(x-L ₁-L ₂) (x ∈ (L ₁+ L ₂, L _w])

Wherein,

H _CBenchmark convexity for working roll;

β is roll forming adjustment of features angle, β ∈ (0, pi/2];

Lw is the working roll barrel length;

B is a strip width;

a ₂, a ₄, a ₆Be the compensated curve characteristic coefficient;

In the formula, L ₁Be convexity control section length, ${\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="S2007101690292E00021.png,S2007101690292E00031.png"\; state="\{\{state\}\}">L</figure-callout>}}_1=\frac{L_w}{2}+\frac{B}{2}+S_{\mathrm{st}};$

In the formula, L ₂For the limit falls and wear control segment length, L ₂=S _End-S _St

$a_0=\frac{H_C}{1-\sin (\mathrm{\&pi;}/2-\mathrm{\&beta;})}\&times;\sin (2\mathrm{\&beta;}{\mathrm{<figure-callout\; id="1"\; label="L"\; filenames="S2007101690292E00021.png,S2007101690292E00031.png"\; state="\{\{state\}\}">L</figure-callout>}}_1/\mathrm{Lw}+\mathrm{\&pi;}/2-\mathrm{\&beta;})$

b ₀＝a ₀+a ₂L ² ₂+a ₄L ⁴ ₂+a ₆L ⁶ ₂

b ₁＝2a ₂L ₂+4a ₄L ³ ₂+6a ₆L ⁵ ₂

S _StBe rolling first band working roll putting position during steel;

S _EndWorking roll putting position during for rolling last piece band steel;

H _EFor the limit falls and the wear control amount, its value is big more, and the limit falls with the wear control ability strong more, requires high more to roll shifting precision and rolling stability simultaneously;

H _TPoor for the whole roller of conical section footpath, fall and wear control amount, process section roller footpath poor composition by the limit;

$L_3=\frac{L_w}{2}-\frac{B}{2}-S_{\mathrm{end}};$

$L_T=L_2+L_3=\frac{L_w}{2}-\frac{B}{2}-S_{\mathrm{st}}.$

Convexity control section length L ₁The roll forming of part is described with equation 1, can pass through H _CThe convexity of band steel is controlled in the adjusting of value, adjusts roll gap distributional pattern (implication is seen Fig. 8) by roll forming adjustment of features angle β ∈ [0, pi/2].H _CValue more little, initial unloaded roll gap convexity is also more little, H _CLess than zero the time, will present negative initial unloaded roll gap convexity; The β value is more little, and the roll gap middle part is smooth more.

The limit falls and wear control segment length L ₂The roll forming of part is described a with equation 2 ₂, a ₄, a ₆Three coefficients draw H by working roller abrasion computation model and strip width in the hot rolling unit _E=a ₂L ₂ ²+ a ₄L ₂ ⁴+ a ₆L ₂ ⁶, H _T=H _E+ b ₁L ₃, can make in the operation of rolling band steel rolling at working roll " flat region " all the time, thus overcome hot continuous rolling especially the downstream frame significantly the strip edge that causes of " box " wearing and tearing fall excessive.

Compensated curve characteristic coefficient a ₂, a ₄, a ₆Definite method be known technology, simply be described below.

The working roller abrasion geometry is formed (dotted portion among Fig. 6, [1] Cao Jianguo, Zhang Jie by oa, ab, bc, cd, df five parts, Gan Jianbin, Deng. non-orientation silicon steel hot rolling working roller abrasion forecasting model. University of Science ﹠ Technology, Beijing's journal, 2006,28 (3): 286-289; [2] Mu Shanwen, Zhang Jie, Cao Jianguo, etc. working roller abrasion study on model parameter during silicon steel plate is rolling. metallurgical equipment, 2005, (2): 18～21; [3] He Anrui, Zhang Qingdong, Cao Jianguo, Deng. hot fine rolling unit working roller abrasion is analyzed and forecast. metallurgical equipment, 1999, (3): 23～26), wherein bc partly for band steel and working roll contact area, represents that with the biquadratic curve form all the other use the straight line approximate representation.Behind a rolling intact steel, the wear extent w of working roll (x) is:

$w\left(x\right)=k_{w0}{L}_Z{P_a}^{k_{w1}}\frac{L_S}{D_W}(1+k_{w2}f\left(x\right))$

In the following formula:

k _W0: the combined influence coefficient, relevant with band steel matter, working roll material, belt steel temperature etc.;

Lz: mill length, km;

P _a: unit draught pressure, kN/mm;

k _W1: unit draught pressure influence coefficient;

L _S: contact arc length, mm;

D _W: work roll diameter, mm;

k _W2: uneven wear coefficient in the strip width scope;

F (x): describe the function of the axial uneven wear degree of working roll, its form is as follows:

$f_{\left(x\right)}=\left\{\begin{array}{cc}0& x\&Element;[0,x_1)\\ (x-a)({\mathrm{<figure-callout\; id="0"\; label="e"\; filenames="S2007101690292E00021.png,S2007101690292E00031.png"\; state="\{\{state\}\}">e</figure-callout>}}_0+e_2+e_4)/L_{S1}& x\&Element;[{\mathrm{<figure-callout\; id="1"\; label="x"\; filenames="S2007101690292E00021.png,S2007101690292E00031.png"\; state="\{\{state\}\}">x</figure-callout>}}_1,x_2)\\ {\mathrm{<figure-callout\; id="0"\; label="e"\; filenames="S2007101690292E00021.png,S2007101690292E00031.png"\; state="\{\{state\}\}">e</figure-callout>}}_0+e_2{(\frac{x-b}{0.5B}-1)}^2+e_4{(\frac{x-b}{0.5B}-1)}^4& x\&Element;[x_2,x_3]\\ (c-x)({\mathrm{<figure-callout\; id="0"\; label="e"\; filenames="S2007101690292E00021.png,S2007101690292E00031.png"\; state="\{\{state\}\}">e</figure-callout>}}_0+e_2+e_4)/L_{S2}& x\&Element;(x_3,x_4]\\ 0& x\&Element;(x_4,x_5]\end{array}\right.$

E wherein ₀, e ₂, e ₄Be multinomial coefficient; X is the working roll axial coordinate; Can get by geometrical relationship among Fig. 5:

x ₁＝Lw/2-S-B/2-L _s1

x ₂＝x1+L _s1

x ₃＝x1+L _s1+B

x ₄＝x1+L _s1+B+L _s2

x ₅＝Lw

L _S1, L _S2: the contact with the strip tapering part length of eroded area both sides of working roll, span is 15mm～40mm usually.Lw: working roll barrel length, mm; B: strip width, mm; S: working roll axial movement value, mm.

After a rolling unit finished, the calculated value Cw of the axial each point wearing and tearing of working roll was:

$\mathrm{Cw}=\underset{i=1}{\overset{n_w}{\mathrm{\&Sigma;}}}w{\left(x\right)}_i$

N in the formula _w: the contained band bloom of a rolling unit number.

Calculate the working roller abrasion roll forming according to technological parameters such as the layout of wearing and tearing computation model substitution rolling unit, roll shifting strategy, mill lengths, utilize wearing and tearing roll shape curve that the wearing and tearing forecasting model calculates different roll shifting strategies as shown in Figure 9, and to L ₁～(L ₁+ L ₂) section can determine compensated curve characteristic coefficient a with the following formula match ₂, a ₄, a ₆Scope, by testing definite actual value:

y＝a ₀+a ₂(x-L ₁) ²+a ₄(x-L ₁) ⁴+a ₆(x-L ₁) ⁶ (x∈[L ₁，L ₁+L ₂])

Structural manufacturing process segment length L ₃The roll forming of part is described with equation 3, and its design principle is to reduce the roll dressing amount as far as possible, guarantees the mill that is simple and easy to of whole roll forming, thereby improves the grinding roller precision.

During actual design, the intersection point place that convexity control section and limit fall with the wear control section need carry out smoothing processing.

Aforementioned working roll preferably is used to irreversible roll shifting with axial folk prescription, the axial roll shifting range of described working roll s ∈ [40mm, 400mm], the roll shifting step-length is sp ∈ [0mm, 10mm], can make like this and be with steel to be rolled at working roll " flat region " all the time in the operation of rolling.

As follows in conjunction with the described 1700 continuous hot-rolling mill values of present embodiment:

Lw is the working roll barrel length, gets Lw=2000mm in the present embodiment.B is a strip width, is B=1050mm for present embodiment.H _CBenchmark convexity for working roll; L ₁For the convexity control section, get L ₁=1525mm.H _EFor the limit falls and the wear control amount, its value is big more, and the limit falls with the wear control ability strong more, and is high more to roll shifting precision and rolling stability requirement simultaneously, gets H _E=77 μ m.H _TPoor for the whole roller of conical section footpath, fall and wear control amount, process section roller footpath poor composition by the limit, wherein the increase of any one all can make its increase.And it mainly is subjected to the grinding machine ability, H _TBig more, high more to the grinding machine Capability Requirement, this example is got H _T=1024 μ m.S _StFor rolling first band working roll putting position during steel, get S _St=0mm; S _EndThe working roll putting position is got S during for rolling last piece band steel _End=145mm.

Use above-mentioned roll and carried out the 2 phases rolling experiment of totally 4 rolling unit meter 5835t in 1700 continuous hot-rolling mill F5 frames, obtained obvious control effect with the method that axial folk prescription is used to irreversible roll shifting.When adopting the long stroke roll shifting of routine work roller roll forming rolling, silicon steel middle part convexity is bigger than normal, especially the limit falls significantly, causes being with the whole convexity of steel very big, and promptly lateral thickness difference is significantly bigger than normal.By contrast, use the shape of cross section of the low grade non-oriented silicon steel of working roll of the present invention obviously to improve: district size and Bian Jiangliang fall in strip edge all to be had obviously and reduces, and these all help whole convexity is reducing of lateral thickness difference.Use working roll of the present invention not only significantly to increase low convexity band steel ratio, the ratio of the rolling forward and backward band steel exports convexity C40 of commerical test≤52 μ m brings up to 81.25% by 13.7%, can also effectively control the quantity of the volume that exceeds standard, the band steel ratio of convexity＞60 μ m drops to 6.60% from 65.6%.Because hot continuous rolling silicon steel lateral thickness difference (promptly being with the whole convexity of steel) quality requirement is harsh, and the silicon steel rolling unit is more remarkable than the roll wear of other unit, more serious at rolling later stage roll wear, particularly in appearance " box-shaped " worn area and after local " cat ear " wearing and tearing occurring near strip edge portion, very easily cause strip edge to fall significantly, convexity increases.Therefore the non-orientation silicon steel rolling unit is obviously little than general steel rolling unit, and the former adopts the routine work roller can only roll about 60 usually, and the latter can roll nearly 140 blocks of band steel.When the test rolling unit band bloom number that employing the invention provides technology is increased to 80 even 95 by 60 of routine work roller, still can obtain obvious control effect, this The Application of Technology provides strong technical guarantee for the expansion of rolling unit.And the commercial Application rolling unit is by 60 stable expanding to more than 80.The low code non-oriented rolling unit of 1700 continuous hot-rolling mills is by 60 stable expanding under 80 above conditions, along with working roll provided by the invention is put into continuously stable application comprehensively by stablizing commercial Application, the ratio of 2.3mm * 1050mm non-orientation silicon steel C40≤45 μ m brings up to 93.15% by 42.05%.

The specific embodiment two:

Convexity control section length L ₁The roll shape curve of part also can adopt common parabola roll shape $y=H_C[1-{(\frac{2x}{L_W}-1)}^2],$ See Fig. 7, (see Remn-Min Guo, Characteristics ofrolling mills with roll shifting, Iron and steelengineer, 1988,65 (12): 45～54) add that hot-rolling shape that hot rolling unit sets up is stablized component and (seen Zhang Jie, Zhang Xuanli, Cao Jianguo, Deng. based on the working roll temperature field parameter optimization model of genetic algorithm, metallurgical equipment, 2003, (4): 4-7; Ginzburg V B, High-Quality SteelRolling:Theory and Practice, Marcel Dekker, New York 1993:488-528) is composited.Other is identical with the specific embodiment one.

In addition, convexity control section length L ₁The roll shape curve of part also can adopt conventional convexity roll forming constituted modes such as cosine-shaped, can realize purpose of the present invention.

Claims (3)

1. the working roll of control and wear control falls in a consideration to strip steel convexity, limit, it is characterized in that described working roll is made up of three parts by length direction, i.e. convexity control section length L ₁, the limit falls and wear control segment length L ₂, structural manufacturing process segment length L ₃

Determine that the limit falls and wear control segment length L ₂The roll forming equation of part is:

y＝a ₀+a ₂(x-L ₁) ²+a ₄(x-L ₁) ⁴+a ₆(x-L ₁) ⁶ x∈[L ₁，L ₁+L ₂]

Determine structural manufacturing process segment length L ₃The roll forming equation of part is:

y＝b ₀+b ₁(x-L ₁-L ₂) x∈(L ₁+L ₂，L _w]

Wherein,

$a_0=\frac{H_c}{1-\sin (\mathrm{\&pi;}/2-\mathrm{\&beta;})}\&times;\sin (2\mathrm{\&beta;}{L}_1/\mathrm{Lw}+\mathrm{\&pi;}/2-\mathrm{\&beta;})$

H _CBenchmark convexity for working roll;

β is roll forming adjustment of features angle, β ∈ (0, pi/2];

Lw is the working roll barrel length;

B is a strip width;

a ₂, a ₄, a ₆Be the compensated curve characteristic coefficient;

b ₀＝a ₀+a ₂L ² ₂+a ₄L ⁴ ₂+a ₆L ⁶ ₂

b ₁＝2a ₂L ₂+4a ₄L ³ ₂+6a ₆L ⁵ ₂

L ₁Be convexity control section length, $L_1=\frac{L_w}{2}+\frac{B}{2}+S_{\mathrm{st}};$

L ₂For the limit falls and wear control segment length, L ₂=S _End-S _St

S _StBe rolling first band working roll putting position during steel;

S _EndWorking roll putting position during for rolling last piece band steel.

2. the working roll of control and wear control falls in consideration to strip steel convexity according to claim 1, limit, it is characterized in that determining convexity control section length L ₁The roll forming equation of part is:

$y=\frac{H_C}{1-\sin (\mathrm{\&pi;}/2-\mathrm{\&beta;})}\&times;\sin (2\mathrm{\&beta;x}/\mathrm{Lw}+\mathrm{\&pi;}/2-\mathrm{\&beta;}),x\&Element;[0,L_1)$

3. the using method of the described working roll of aforementioned claim, it is characterized in that the axial folk prescription of described working roll and working roll is used to irreversible roll shifting, the axial roll shifting range of described working roll s ∈ [40mm, 400mm], the roll shifting step-length is sp ∈ [0mm, 10mm].

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