SU1359025A1 - Method of effecting the shape of strip rolled in four-high mill - Google Patents

Description

one

The invention relates to rolling production, more precisely to methods for producing stripes on quarto mills in ferrous and non-ferrous metallurgy.

The purpose of the invention is to increase the limits of adjustment of the transverse strip thickness variation due to the redistribution of loads in the contact zones of each work roll.

In Fig.1 shows a diagram of the skew axes of the rolls in the regulation of the transverse thickness variation - synchronous reversal of the upper working and lower supporting rolls relative to the lower working and upper supporting rolls; Fig. 2 is a plot of the limits of adjustment of the transverse thickness variation on the skew angle (fi) of the work rolls; Fig. 3 is a graph of the dependence of the limits of adjustment of the transverse multiplicity on the width of the rolled strip.

The method of influencing the transverse raznostolchinnost strip is carried out as follows.

In the rolling process, as a result of roll deflection, a transverse thickness variation of the uh strip occurs, i.e. unequal mass in its ishrina B is equal to:

dh hj - h ,.

where h.

- thickness across the middle section of the strip;

h, is the thickness at the edge of the strip. In order to reduce the transverse strip irregularity and, consequently, improve its quality, it is proposed to turn the upper work roll synchronously with the opposite one, relative to the rolled strip by the lower support roll, for example, from the side of the axial fixation of the rolls in the rolling direction. In this case, the lower work roll and the upper support roll are turned in the opposite direction against the rolling direction on the same side of the axial fixations, and the drive side of the rolls is turned in opposite directions, respectively. As a result of this reversal of the rolls, their axes will take the position of decreasing from the thickness gauge the automatic one shown in FIG. Moreover, the signals are sent to ki at the rolling process- ing device at a relative roll gate. In this case, depending on the speed roll, synchronously with the lower roll, the upper roll rotation, the angles of their intersection of the rolls are folded in a horizontal plane.

2

measures from O to 3.3-10 glad, you can accordingly adjust the transverse thickness variation of the uh band from O to 90 km / (figure 2, curve 3).

In addition, the adjustment of the transverse thickness variation depends on the width of the rolled strip B. For example,

at the same angle of rotation of the rolls B 25-10 happy, with a width of strip B 1200 mm transverse to different thicknesses

The width of the strip decreases by uh 0.11 mm, and with a width of 1600 mm, the thickness difference decreases by ih 0.19 mm (FIG. 3, curve 3).

 According to the calculation carried out for the cold rolling mill 2500 when rolling a strip of mm, a graph of changes in the value of the adjustable transverse thickness variation dB (Fig. 1, curves 1, 2 and 3) was drawn up depending on the angle 3 3 of the rolls intersection (see Fig. 2, where curve 3 corresponds to the adjustment of the transverse strip thickness variation according to the proposed method of action, and curves 1 and 2, respectively, with a joint reversal of the pairs

work rolls and support rolls when turning only work rolls). With the proposed method, with a much smaller angle / skew of the rolls, the greater thickness variation of the band uh can be adjusted and is represented

it is possible to regulate the transverse difference of the strip within wide limits.

This method can make a significant adjustment to the regulation.

transverse thickness variation, especially when rolling narrow strips (Fig. 3, where curve 3 corresponds to the regulation of the transverse thickness variation of the strip according to this method of action,

curve 1, 2, 4, respectively, with a joint reversal of the working and support rolls, with the reversal of only the work rolls or when using the roll bending anti-bending devices.

PRI and MER. When rolling on a four-mill camp 2500 strip width B 1610 mm at the exit from the 4th stand, the transverse thickness difference was & 0.2 mm. For the purpose of her

the bones relative to the cage axis (from the side of axial fixation of the rolls in the direction of rolling, and from the drive side against the direction of rolling) at an angle of fb of 16–10 rad, and the lower work roll with the upper support roll are turned in the opposite direction at the same angle j of rad . This provides a total roll angle of 32 inches. During rolling, the transverse strip thickness variation decreases by 0.18 mm and is 02 mm.

1359025

ten

bake an increase in the limits of adjustment of the transversal strip difference due to the redistribution of pressures in the contact zones of each work roll.

Claims (1)

Invention Formula The method of influencing the profile of the rolled strip on the quarto mill by adjusting the pivoting angle of the axes of the work rolls in the horizontal plane during the rolling process After rolling the weld across the cross-section relative to one another, about a ton and on the razor (the innality. The bands again rise to dL 0.12 mm. To correct it, the angle of intersection automatically increases to due to the fact that, in order to increase the limits of the adjustment of the transverse thickness difference of the strip by redistributing the contact 35 рад glad, and transverse to the thickness difference of 20 pressures, the support rolls also reduce the strip ratios to l 0.02 mm. The proposed method of influencing the profile of the rolled strip, as compared to the known ones, allows them to be relative to each other, with each supporting roll being turned in the same direction and at the same angle as the working roll opposite to it. 1359025 bake an increase in the limits of adjustment of the transversal strip difference due to the redistribution of pressures in the contact zones of each work roll. Invention Formula The method of influencing the profile of the rolled strip on the quarto mill by adjusting the pivoting angle of the axes of the work rolls in the horizontal plane during the rolling process due to the fact that, in order to increase the limits of the adjustment of the transverse thickness difference of the strip by redistributing the contact pressure rolls are also developed they are rotated relative to each other, each rolling roll being turned in the same direction and at the same angle as the working roll opposite to it. J b mm 90 phage. i 80 70 60 50 0 30 20 10  / 7 LfO IffO 11 22 fie.g 33 J ANGM O.OS / 000 rzoo Phie-b f6OO efMM) Editor M.Petrova Compiled by G.Rostov Tehred L. Serdyukova Proofreader M.Sharoshi Order 6021/12 Circulation 481 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 rtp production and printing: enterprise, Uzhgorod, Projecto st., 4