CN100413608C - Support roller matched with working roller curve of continuous variable convex rolling mill - Google Patents

Abstract

The present invention discloses a supporting roller matched with a roller shape curve of working rolls of a continuous variable convexity rolling mill. The present invention comprises a pair of CVC working rollers and an upper and a lower supporting rollers, wherein the CVC working rollers have antisymmetric roller shape curves; the upper and the lower supporting rollers are also antisymmetric roller shape curves composed of four sections of odd functions in a diameter direction along the length of roller bodies; both ends of the roller bodies can carry out chamfering optimization on the basis; the optimized roller shape curves of the supporting rollers obviously improves the homogeneity of the distribution of the contact pressure between the rollers of the CVC rolling mill, greatly improves the contact fatigue and the local wear of the supporting rollers of the CVC rolling mill, reduces the roller consumption of the supporting rollers, and extends the available machine time of the supporting rollers.

Description

A kind of in order to support the backing roll of continuous variable crown mill working roll

Technical field

The present invention relates to a kind of rolling mill roll, more particularly, is relevant a kind of in order to support the backing roll of continuous variable convex (CVC) operation roll of mill.

Background technology

Continuous variable crown mill, promptly the roller of CVC milling train system is made up of backing roll 1 and CVC working roll 2.The backing roll of CVC milling train adopts conventional plain-barreled roll roll shape always for a long time, as shown in Figure 1.It is seriously inhomogeneous that the backing roll of conventional plain-barreled roll roll shape generation roller when CVC mill milling (rolled piece 4 relatively) presses the power distribution indirectly, thereby it is serious uneven to cause the backing roll concentrated wear to distribute.

Relevant patent documentation (EP0091540A1, the backing roll roll shape that has proposed a kind of CVC milling train in 1983.10.19) changes the scheme of shape, it mainly is the roll shape Rotate 180 ° roll shape as backing roll 3 that adopts CVC working roll 2, as shown in Figure 2.This backing roll roll shape can only make the roller of roll shifting position when zero-bit press the power problem of uneven distribution indirectly and obtain some improvement, but after the roll shifting roller press indirectly that power distributes then can be more inhomogeneous.

Summary of the invention

The objective of the invention is to provide a kind of modified backing roll of matched with working roller curve of continuous variable convex rolling mill for the defective that overcomes prior art, this backing roll can not only improve roll shifting position roller when the zero-bit by the correction to its roller curve and press the power problem of uneven distribution indirectly, and the roller that can improve in whole roll shifting stroke range presses the power problem of uneven distribution indirectly.

The technical scheme that realizes above-mentioned purpose is: a kind of backing roll of matched with working roller curve of continuous variable convex rolling mill, comprise a pair of CVC working roll with antisymmetry roller curve, two backing rolls up and down, wherein, described backing roll up and down also is the antisymmetry roller curve, they are made up of four sections odd functions along barrel length in diametric(al), comprising:

BC section curve (s ₁＜y≤-s ₂):

In this zone, when working roll moved to positive extreme position (+δ ') from negative extreme position (δ '), the track of working roll point of greatest diameter was a straight line.For working roll can left and rightly be moved, backing roll adopts the cylinder roll shape, and the equation of diameter function is:

D _s(y)＝D+a ₂₁

D _x(y)＝D+a ₂₁ (1)

s ₁＝-δ′+δ″ s ₂＝δ′+δ″

Wherein, D is the backing roll nominal diameter;

D _s(y) be upper support roller diameter function;

D _x(y) be lower support roller diameter function;

δ " when getting maximum for the work roll diameter function along the coordinate of barrel length (be negative value, this moment working roll the roll shifting position in zero-bit);

δ ' is a working roll roll shifting stroke

a ₂₁Maximum gauge according to working roll calculates the roller curve parameter of determining.

AB section curve (l _s/ 2≤y≤-s ₁):

Corresponding to this zone, the backing roll roll shape that adopts does not interfere in the time of making working roll move to negative extreme position on the one hand, making working roll roller when different shift positions press power indirectly on the other hand again is evenly distributed, therefore, working roll curve during according to negative extreme position is determined the backing roll roll shape, and the diameter function is:

$D_s\left(y\right)=D+a_{11}(y-{\mathrm{\δ}}_1)+...+a_{1({2n}_1-1)}{(y-{\mathrm{\δ}}_1)}^{{2n}_1-1}$

$D_x\left(y\right)=D-a_{11}(y+{\mathrm{\δ}}_1)-..-a_{1({2n}_1-1)}{(y+{\mathrm{\δ}}_1)}^{{2n}_1-1}---\left(2\right)$

Wherein, l _sBe the backing roll barrel length;

2n ₁-1 polynomial number of times for expression backing roll AB section curve, n ₁Be natural number;

$a_{11}...a_{1({2n}_1-1)},$ δ ₁Be the backing roll roller curve parameter of determining at concrete CVC working roller curve calculation of parameter, CVC working roller curve parameter difference, the value of these parameters are also different.

CD section curve (s ₂＜y≤s ₃):

In this zone, working roll is left and right when mobile, and the maximum track of curve each point is the roller curve of working roll when positive extreme position, and is identical with the design principle of AB section curve, work roll diameter function when difference is by positive extreme position is determined the backing roll roller curve, and equation is:

$D_s\left(y\right)=D+a_{11}(y-{\mathrm{\δ}}_3)+...+a_{1({2n}_1-1)}{(y-{\mathrm{\δ}}_3)}^{{2n}_1-1}$

$D_x\left(y\right)=D-a_{11}(y+{\mathrm{\δ}}_3)-..-a_{1({2n}_1-1)}{(y+{\mathrm{\δ}}_3)}^{{2n}_1-1}---\left(3\right)$

Wherein, s ₃Intersection point by CD section and DE section curve is determined;

δ ₃Be the backing roll roller curve parameter of determining at concrete CVC working roller curve calculation of parameter, CVC working roller curve parameter difference, the value of this parameter are also different,

DE section curve (s ₃＜y≤l _s/ 2):

This section curve, still the design principle with AB section curve is identical, and the working roll curve during according to negative extreme position is determined the backing roll roll shape, and the diameter function is:

$D_s\left(y\right)=D+a_{11}(y-{\mathrm{\δ}}_4)+...+a_{1({2n}_1-1)}{(y-{\mathrm{\δ}}_4)}^{{2n}_1-1}$

$D_x\left(y\right)=D-a_{11}(y+{\mathrm{\δ}}_4)-...-a_{1({2n}_1-1)}{(y+{\mathrm{\δ}}_4)}^{{2n}_1-1}---\left(4\right)$

In the tool, δ ₄Be the backing roll roller curve parameter of determining at concrete CVC working roller curve calculation of parameter, CVC working roller curve parameter difference, the value of this parameter are also different.

The backing roll of a kind of matched with working roller curve of continuous variable convex rolling mill as previously discussed, wherein, the optimization curve of limit, the two ends portion of described backing roll, be on the basic backing roll roll shape basis that constitutes of backing roll roll shape that above four sections curves are formed backing roll roll shape after chamfering is optimized to be carried out at body of roll two ends, general available following power function is represented.

$D_1\left(y\right)=D\left(y\right)-{2a}_0{\left(\frac{y-(l_s/2-l_z)}{l_z}\right)}^m---\left(5\right)$

Wherein, D (y) is the definite basic roll shape curvilinear function of said method;

D ₁(y) be the roll shape limit portion roller curve function after optimizing;

l _z, a ₀For body of roll limit portion chamfering length and height, press power indirectly according to roller and be evenly distributed, the constraints that the while working roll contacts with the full body of roll of backing roll is optimized to calculate to be determined;

M is the number of times of body of roll limit portion chamfering roller curve power function, is natural number, and general value is 2.

Therefore, be the symmetry of proof load roll gap, in the present invention, the roll shape of the roll shape of two backing rolls and CVC working roll is the same up and down is antisymmetric.More even for roll gap pressure is distributed, do not influence the positive and negative direction of working roll simultaneously and move, backing roll diameter function is made up of four sections odd functions.Because the backing roll of such roller curve can improve the CVC mill rolls and press the power distributing homogeneity indirectly, thereby improves the contact fatigue and the concentrated wear of CVC milling train backing roll significantly, reduce backing roll roller consumption, and can prolong the floor-to-floor time of backing roll.

Description of drawings

Fig. 1 is the schematic diagram that adopts the backing roll of plain-barreled roll roll shape in the existing C VC milling train;

Fig. 2 adopts the relative working roller Rotate 180 ° schematic diagram as backing roll in the existing C VC milling train;

Fig. 3 is that the present invention is used for the matched with working roller curve of continuous variable convex rolling mill of CVC milling train and the upper support roller roller curve schematic diagram of displacement curve design;

Fig. 4 is a backing roll body of roll end-beveling curve exploded view;

Fig. 5 is a upper support roller roller curve schematic diagram of the present invention;

Fig. 6 is the comparison diagram of backing roll roller curve in upper support roller roller curve of the present invention and the existing CVC milling train;

Fig. 7 a, 7b represent the different roller curves of backing roll respectively with 7c, and during the different roll shifting positions of working roll (shift), backing roll and working roll press the analysis chart that power distribution result of calculation is done indirectly;

Fig. 8 is the schematic diagram of the pattern curve after backing roll roll shape (cylinder roll shape) wearing and tearing before improving;

Fig. 9 a and Fig. 9 b represent the upper and lower backing roll roll shape of optimization that the present invention designs respectively, use the analysis chart that distributes in the contrast-wearing and tearing of F5 frame before and after last machine.

The specific embodiment

See also Fig. 3, there is shown the design of upper support roller roller curve, abscissa y is to be the barrel length direction coordinate of initial point with backing roll barrel length center line, and ordinate D (y)-D is the poor of working roll (backing roll) diameter and nominal diameter.At first, can see in Fig. 3 that the roll shape that is used for the working roll of CVC milling train of the present invention is antisymmetric, the roller curve of CVC working roll can be represented by high-order moment, generally gets first three items, promptly represent with cubic polynomial, as the formula (6):

$\mathrm{Dws}\left(y\right)=D-\frac{3\mathrm{\ΔD}}{4e}(y-\mathrm{\δ})+\frac{\mathrm{\ΔD}}{{4e}^3}{(y-\mathrm{\δ})}^3$

$\mathrm{Dwx}\left(y\right)=D+\frac{3\mathrm{\ΔD}}{4e}(y+\mathrm{\δ})-\frac{\mathrm{\ΔD}}{{4e}^3}{(y+\mathrm{\δ})}^3---\left(6\right)$

Wherein, the work roll diameter when D is y=δ, i.e. working roll nominal diameter;

Δ D is the poor of working roll maximum and minimum diameter;

E is the horizontal amount of movement of working roll;

δ be working roll greatly and half of very small diameter cross-sectional distance.

Y is for being the barrel length direction coordinate of initial point with backing roll barrel length center line,

After above each parameter is determined, according to formula (6), can make the roller curve of working roll, represent with the O line that in Fig. 3 its displacement line during different roll shiftings position when rolling " is represented with O ' and O.Be the symmetry of proof load roll gap, the roll shape of two backing rolls also should be antisymmetric up and down.More even for roll gap pressure is distributed, do not influence the positive and negative direction of working roll simultaneously and move, the roller curve of backing roll is the backing roll diameter function of being made up of four sections odd function AB, BC, CD and DE on the roller curve O of working roll line basis.

At the CVC working roller curve of certain factory, see following table 1 at different frame top working roll roller curve parameter values.

Table 1

According to the CVC working roller curve, the parameter value at the basic roller curve of different frame upper support rollers of design sees Table 2.

Table 2

According to parameter value shown in the table, each section of F4-F5 backing roll curvilinear equation is as follows:

BC section curve (575＜y≤-375):

According to the equation (1) of above diameter function, the parameter in the substitution table 2

Upper support roller diameter function: D _s(y)=D+0.09058.

Lower support roller diameter function: D _x(y)=D+0.09058.

AB section curve (1025≤y≤-575):

According to the equation (2) of above diameter function, the parameter in the substitution table 2

Upper support roller diameter function:

D _s(y)＝D-2.80144×10 ^-4(y+90)+3.9699×10 ^-10(y+90) ³。

Lower support roller diameter function:

D _x(y)＝D+2.80144×10 ^-4(y-90)-3.9699×10 ^-10(y-90) ³。

CD section curve (375＜y≤491.6):

According to the equation (3) of above diameter function, the parameter in the substitution table 2

Upper support roller diameter function:

D _x(y)＝D-2.80144×10 ^-4(y-110)+3.9699×10 ^-10(y-110) ³。

Lower support roller diameter function:

D _x(y)＝D+2.80144×10 ^-4(y+110)-3.9699×10 ^-10(y+110) ³。

DE section curve (491.6＜y≤1025):

According to the equation (4) of above diameter function, the parameter in the substitution table 2,

Upper support roller diameter function:

D _x(y)＝D-2.80144×10 ^-4(y+90)+3.9699×10 ^-10(y+90) ³。

Lower support roller diameter function:

D _x(y)＝D+2.80144×10 ^-4(y-90)-3.9699×10 ^-10(y-90) ³。

Reciprocal curve

See also Fig. 4, there is shown above-mentioned on the basis of the basic roller curve of backing roll body of roll end further optimize curve, its parameter value is seen as following table 3.

Table 3

According to the equation (5) of above diameter function, each parameter of being got in the substitution table 3, the roll shape limit portion roller curve function after can being optimized:

$D_1\left(y\right)=D\left(y\right)-2\×0.14{\left(\frac{y-(1025-100)}{100}\right)}^2.$

Upper support roller roller curve comparative example after basic backing roll roll shape of the present invention and the optimization, as shown in Figure 5.In Fig. 5, the basic backing roll roller curve of curve 1 expression the present invention design; Backing roll roller curve after the chamfering of curve 2 expression the present invention designs is optimized.Abscissa is for being the barrel length direction coordinate of initial point with backing roll body of roll end among the figure, and unit is mm.Ordinate is for being the vary in diameter along the barrel length direction of reference point with backing roll body of roll end diameter, and unit is mm.This shows that backing roll roll shape after the optimization can impel roller to press power indirectly and be more evenly distributed.

See also Fig. 6, upper support roller roller curve that designs for the present invention and previous CVC backing roll roller curve comparison diagram, wherein, thick line is represented backing roll roller curve of the present invention, and thin line is represented the roller curve of the CVC backing roll of existing C VC milling train design.

The pressure distribution relation that contacts about between the backing roll roll shape of the basic backing roll roll shape of former cylindrical roll shape, the present invention design, optimization and working roll is illustrated respectively on Fig. 7 a, 7b and the 7c.In the drawings, the different roller curves of backing roll, during the different roll shifting positions of working roll (shift), backing roll and working roll press the power distribution indirectly and make by result of calculation, wherein, roller when curve curve1 is the common cylinder roll shape corresponding to backing roll presses power indirectly and distributes, and the roller of curve curve2 during corresponding to the basic backing roll roll shape of the present invention's design presses power indirectly and distribute, and the roller of curve curve3 during corresponding to the optimization backing roll roll shape of the present invention's design presses power indirectly and distribute.In addition, the abscissa y among the figure is for being the barrel length direction coordinate of initial point with backing roll barrel length center line, and unit is mm, and ordinate q (y) presses power indirectly for roller, and unit is kN.As can be seen from FIG., it is that (not only partly to contact pressure distribution more even for the body of roll for the best that the roller of each curve presses indirectly that power distributes with curve curve3, and limit portion contact pressure is low), curve curve1 is for the poorest, curve curve2 other parts except that the portion of roll shape limit approach curve curve3 substantially, and therefore the wood invention is used optimization backing roll roll shape can improve the CVC mill rolls and pressed the power distributing homogeneity indirectly.

The present invention tries out in Baosteel 2050 hot finisher F5 frames through the backing roll of optimizing roller curve, result of the test shows, this backing roll roller curve can improve the concentrated wear skewness that roller presses power distribution and backing roll indirectly, and Fig. 8, Fig. 9 a and Fig. 9 b are seen in comparative analysis.

When the backing roll roll shape was the cylinder roll shape before improving, all there was serious concentrated wear in backing roll up and down, as shown in Figure 8.When adopting the optimization backing roll roll shape of the present invention's design, roll shape contrast-wearing and tearing distribute on (F5 upper support roller) before and after last machine, serious concentrated wear do not occur, shown in Fig. 9 a and Fig. 9 b.The wearing and tearing that shown in Fig. 8 are upper and lower backing roll cylinder roll shape distribute, be the pattern curve before and after the wearing and tearing of optimization roll shape shown in Fig. 9 a and Fig. 9 b, and the zone that forms between two wear curvies among each figure has reflected that overall wearing and tearing distribute, and it is less that the latter is worn and torn, the concentrated wear distribution uniform.

Claims (2)

1. one kind in order to support the backing roll of continuous variable convex (CVC) operation roll of mill, comprise two backing rolls up and down, it is characterized in that described backing roll up and down is the antisymmetry roller curve, they are made up of four sections odd functions along barrel length in diametric(al), comprising:

BC section curve (s ₁＜y≤-s ₂):

In this zone, when working roll moved to positive extreme position from negative extreme position, the track of working roll point of greatest diameter was a straight line, so backing roll employing cylinder roll shape, and the equation of diameter function is:

D _s(y)＝D+α ₂₁

D _x(y)＝D+α ₂₁ (1)

s ₁＝-δ′+δ″ s ₂＝δ′+δ″

Wherein, D is the backing roll nominal diameter;

D _s(y) be upper support roller diameter function;

D _x(y) be lower support roller diameter function;

" along the coordinate of barrel length, be negative value when getting maximum for the work roll diameter function, the roll shifting position of working roll is in zero-bit at this moment for δ;

δ ' is a working roll roll shifting stroke

α ₂₁Maximum gauge according to working roll calculates the roller curve parameter of determining;

AB section curve (l _s/ 2≤y≤-s ₁):

Corresponding to this zone, the backing roll roll shape of employing does not interfere in the time of making working roll move to negative extreme position on the one hand, make working roll roller when different shift positions press power indirectly on the other hand again and be evenly distributed, so the diameter function is:

$D_s\left(y\right)=D+a_{11}(y-{\mathrm{\δ}}_1)+...+a_{1(2n_1-1)}{(y-{\mathrm{\δ}}_1)}^{2n_1-1}$

$D_x\left(y\right)=D-a_{11}(y+{\mathrm{\δ}}_1)-...-a_{1(2n_1-1)}{(y+{\mathrm{\δ}}_1)}^{2n_1-1}---\left(2\right)$

Wherein, l _sBe the backing roll barrel length;

2n ₁-1 polynomial number of times for expression backing roll AB section curve, n ₁The power natural number;

$a_{11}\·\·\·a_{1(2n_1-1)},$ δ ₁Be the backing roll roller curve parameter of determining at concrete CVC working roller curve calculation of parameter, CVC working roller curve parameter difference, the value of these parameters are also different;

CD section curve (s ₂＜y≤s ₃):

In this zone, working roll is left and right when mobile, and the maximum track of curve each point is the roller curve of working roll when positive extreme position, and the diameter functional equation of backing roll roller curve is:

$D_s\left(y\right)=D+a_{11}(y-{\mathrm{\δ}}_3)+...+a_{1(2n_1-1)}{(y-{\mathrm{\δ}}_3)}^{2n_1-1}$

$D_x\left(y\right)=D-a_{11}(y+{\mathrm{\δ}}_3)-..-a_{1(2n_1-1)}{(y+{\mathrm{\δ}}_3)}^{2n_1-1}---\left(3\right)$

Wherein, s ₃Intersection point by CD section and DE section curve is determined;

δ ₃Be the backing roll roller curve parameter of determining at concrete CVC working roller curve calculation of parameter, CVC working roller curve parameter difference, the value of this parameter are also different;

DE section curve (s ₃＜y≤l _s/ 2):

This section curve is that the working roll curve during according to negative extreme position is determined the backing roll roll shape, and the diameter function is:

$D_s\left(y\right)=D+a_{11}(y-{\mathrm{\δ}}_4)+...+a_{1(2n_1-1)}{(y-{\mathrm{\δ}}_4)}^{2n_1-1}$

$D_x\left(y\right)=D-a_{11}(y+{\mathrm{\δ}}_4)-...-a_{1(2n_1-1)}{(y+{\mathrm{\δ}}_4)}^{2n_1-1}---\left(4\right)$

Wherein, δ ₄Be the backing roll roller curve parameter of determining at concrete CVC working roller curve calculation of parameter, CVC working roller curve parameter difference, the value of this parameter are also different.

2. as claimed in claim 1 a kind of in order to support the backing roll of continuous variable crown mill working roll, it is characterized in that, the optimization curve of limit, the two ends portion of described backing roll, be on the basic backing roll roll shape basis that constitutes of backing roll roll shape that above four sections curves are formed backing roll roll shape after chamfering is optimized to be carried out at body of roll two ends, general available following power function is represented:

$D_1\left(y\right)=D\left(y\right)-2a_0{\left(\frac{y-(l_s/2-l_z)}{l_z}\right)}^m---\left(5\right)$

Wherein, D (y) is the definite basic roll shape curvilinear function of said method;

D ₁(y) be the roll shape limit portion roller curve function after optimizing;

l _z, α ₀For body of roll limit portion chamfering length and height, press power indirectly according to roller and be evenly distributed, the constraints that the while working roll contacts with the full body of roll of backing roll is optimized to calculate to be determined;

M is the number of times of body of roll limit portion chamfering roller curve power function, and value is 2.

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