CN1062495C - Roller shape of axial movement capable of changing roll pass concavity and shape - Google Patents

Abstract

The present invention belongs to a four-roll or six-roll mill which relates to a roll profile which can change the roll seam convexity and can change a roll shape by the corresponding axial movement of an upper roll and a lower roll. The present invention discloses two roll profiles which can continuously change a convexity value of a corresponding edge in the middle of a roll seam as well as can change a roll curve shape according to requirements of a strip cross-sectional shape and a target board shape; when the technology is adopted, the board shape quality of hot-rolled strips and cold rolled strips can be further improved. Furthermore, the present invention has a significant meaning for changing a situation that the core technology of the present modern large-size cold heat continuous rolled machine is mainly depended on the import.

Description

A kind of roll profile that changes roll gap convexity and variable roll gap shape that moves axially

The invention belongs to the roll profile that a kind of four rollers or six-high cluster mill utilize top and bottom rolls to move to axial change roll gap convexity and can change roll gap shape.

For section convexity and the plate shape of controlling band, a kind of CVC (continuous variable convex) roll shape milling train has at first been invented by German SMS company, the diameter of its upper and lower roll be antisymmetric odd function cubic polynomial (see figure 1) promptly: In the formula: δ=δ _o+ δ _s, δ _oBe the initial movable value of roller curve, δ _sMovement value for the relative initial position of roll.

The formed unloaded roll gap S of above diameter function (y) is the conic section roll gap of symmetry, that is: $S\left(y\right)A-\frac{D_S\left(y\right)+D_X\left(y\right)}{2}=A-D+{\mathrm{\&alpha;}}_1\mathrm{\&delta;}+{\mathrm{\&alpha;}}_3\mathrm{\&delta;}(3{\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="9511744900071.png,9511744900072.png"\; state="\{\{state\}\}">y</figure-callout>}}^2+{\mathrm{\&delta;}}^2)$ The convexity functional value of roll gap function S (y) the relative edge gap values between rollers S of portion (b) is: Δ S (y) _b=S (y)-S (b)=3a ₃δ (y ²-b ²) convex value of roll gap middle part relative edge portion is: Δ S (O) _b=S (O)-S (b)=-3a ₃δ b ²Therefore, change the convex value Δ S (O) that axial internal clearance δ just can change unloaded roll gap _b, but can not change the shape of unloaded roll gap, because shown in the convexity functional value formula of roll gap function S (y) the relative edge gap values between rollers S of portion (b), the shape of its unloaded roll gap is the conic section of fixing, and can not change.Often need to change the distribution shape of roll gap curve in the actual production according to the requirement of load roll gap (band outlet section configuration) and plate shape, could guarantee the glacing flatness of sheet material, simple middle wave or symmetrical bilateral wave can only be controlled because change convex value, complex seas defective in 1/4th complicated waves or the limit can not be corrected.

The purpose of this invention is to provide a kind of convex value that can continuously change roll gap middle part relative edge portion, can change the roll profile of roll gap curve shape again according to the requirement of the Target Board shape of band section configuration.Main points of the present invention are: upper and lower roller diameter adopts antisymmetric SIN function and cubic polynomial combination of function compound function curve together:

In the formula: a-can change the angle of roll gap curve shape;

The sinusoidal amplitude of C-.The formed unloaded roll gap S of compound function (y) the relative edge gap values between rollers S of portion (b) convexity functional value is: $\mathrm{\&Delta;S}{\left(y\right)}_b=C\sin \frac{\mathrm{\&alpha;\&delta;}}{b}(\mathrm{COS}\frac{\mathrm{\&alpha;}}{b}y-\mathrm{COS\&alpha;})-3{\mathrm{\&alpha;}}_3\mathrm{\&delta;}(y^2-b^2)$ The convex value of roll gap middle part relative edge portion is: $\mathrm{\&Delta;S}{\left(O\right)}_b=C\sin \frac{\mathrm{\&alpha;\&delta;}}{b}(1-\cos \mathrm{\&alpha;})+3{\mathrm{\&alpha;}}_3\mathrm{\&delta;}{\mathrm{<figure-callout\; id="2"\; label="b"\; filenames="9511744900071.png,9511744900072.png"\; state="\{\{state\}\}">b</figure-callout>}}^2$ The portfolio ratio of two kinds of functions and combined shaped are: $\frac{\mathrm{\&Delta;S}{\left(y\right)}_b}{\mathrm{\&Delta;S}{\left(O\right)}_b}=\frac{\cos \frac{\mathrm{\&alpha;}}{b}y-\cos \mathrm{\&alpha;}}{(1+\mathrm{\&xi;})(1-\cos \mathrm{\&alpha;})}+\frac{\mathrm{\&xi;}}{1+\mathrm{\&xi;}}\&lsqb;1-{\left(\frac{y}{b}\right)}^2\&rsqb;$ In the formula: $\mathrm{\&xi;}=\frac{3{\mathrm{\&alpha;}}_3\mathrm{\&delta;}{b}^2}{C(1-\cos \mathrm{\&alpha;})\sin \frac{\mathrm{\&alpha;}}{b}\mathrm{\&delta;}}$ Change the convex value Δ S (O) that axial internal clearance δ just can change roll gap _b, and roll gap convexity function Δ S (y) b is one group of family of curves's (see figure 2) that plentiful degree is different when changing a value, rather than as cubic polynomial diameter function, be a fixing conic section.Therefore, roll profile provided by the invention can be selected needed a value according to the requirement of load roll gap shape and plate shape, to guarantee not only to control convex value, can guarantee that also the shape of roll gap distribution curve conforms with the requirement of band plate shape precision.

ξ represents the portfolio ratio of two kinds of functions.ξ=0 illustrates the roll shape of having only SIN function, does not have the cubic polynomial roll shape, and ξ=two kinds of functions of 1 explanation respectively account for half; ξ=2 have illustrated 1st/3rd, the SIN function roll shape, and so on.Like this, for the shape of roll gap curve, except selecting a value, increased the regulating measure of two kinds of curve portfolio ratios again, thereby more helped carrying out the optimal design of roll gap curve shape.

Drawings and Examples:

Fig. 1 moves axially the roll profile that changes the roll gap convexity

Fig. 2 SIN function roll shape roll gap distribution shape

Embodiment:

Present embodiment is disclosed to be that 1,850 four roller aluminium strip rolling mill axles move formula roll compound function roll shape.

Known: D=440mm, 2b=2050mm

According to technological requirement, Δ S (O) _b=0～-0.4mm

According to rolling mill structure design ,-δ _m＜δ _s＜δ m, δ m=100mm. is by formula $\mathrm{\&Delta;S}{\left(O\right)}_b=C\sin \frac{\mathrm{\&alpha;\&delta;}}{b}(1-\cos \mathrm{\&alpha;})+3{\mathrm{\&alpha;}}_3\mathrm{\&delta;}{\mathrm{<figure-callout\; id="2"\; label="b"\; filenames="9511744900071.png,9511744900072.png"\; state="\{\{state\}\}">b</figure-callout>}}^2$

Can determine δ _o=-100mm.Require to select ξ=2, a=110 ° according to distribution shape.By above-mentioned two formula, can calculate C=0.27152mm, a ₃=4.3055 * 10 ^-101/mm ², determine a ₁=-0.90843 * 10 ^-3So it is as follows to go up the roller diameter function: In the formula: δ=δ _o+ δ _s=-100+ (100～100) mm

Y=0～+1025mm

Major advantage of the present invention is that the roll design that makes axle move the formula roll is not only that roll gap is protruding Spend the method for designing of (or concavity) value, but increased the selection of roll gap curve shape. By In decision plate shape precision be not unloaded roll gap, but loading roll gap, therefore, for negative Carry roll gap and target flatness, not only carried out convex value, but also carried out the design of roll gap shape two aspects Further developing of plate shape control technology. The employing of this technology will further improve hot rolling With the strip shape quality in village and cold rolling strap village, for China's strip production brings huge economic benefit, And mainly rely on for the core technology that changes the present modernized Large Scale Cold continuous hot-rolling mill of China Introduction has the big meaning of weight.

Claims (1)

1, a kind of roll forming of the roll that changes roll gap convexity and variable roll gap shape that moves axially is characterized in that:

Upper and lower roller diameter be SIN function and cubic polynomial combination of function compound function together promptly:

The convexity functional value of roll gap function S (y) the relative edge gap values between rollers S of portion (b) is: $\mathrm{\&Delta;S}{\left(y\right)}_b=C\sin \frac{\mathrm{\&alpha;\&delta;}}{b}(\cos \frac{\mathrm{\&alpha;}}{b}y-\cos \mathrm{\&alpha;})-3{\mathrm{\&alpha;}}_3\mathrm{\&delta;}(y^2-b^2)$ The convex value of roll gap middle part relative edge portion is: $\mathrm{\&Delta;S}{\left(o\right)}_b=C\sin \frac{\mathrm{\&alpha;\&delta;}}{b}(1-\cos \mathrm{\&alpha;})+3{\mathrm{\&alpha;}}_3{\mathrm{\&delta;b}}_x^2$ The portfolio ratio of two kinds of functions is: $\mathrm{\&xi;}=\frac{3{\mathrm{\&alpha;}}_3\mathrm{\&delta;}{b}^2}{C(1-\cos \mathrm{\&alpha;})\sin \mathrm{\&delta;}}$ The roll gap shape of two kinds of combination of function: $\frac{\mathrm{\&Delta;S}{\left(y\right)}_b}{\mathrm{\&Delta;S}{\left(O\right)}_b}=\frac{\cos \frac{\mathrm{\&alpha;}}{b}y-\cos \mathrm{\&alpha;}}{(1+\mathrm{\&xi;})(1-\cos \mathrm{\&alpha;})}+\frac{\mathrm{\&xi;}}{1+\mathrm{\&xi;}}\&lsqb;1+{\left(\frac{y}{b}\right)}^2\&rsqb;$

Images