SU1659138A1 - Method of rolling strip metal - Google Patents

Abstract

The invention relates to ferrous and nonferrous metallurgy, and more specifically to methods for rolling a metal strip in drive rolls. The purpose of the invention is to improve the quality of the strip by eliminating the gutter defect. The method consists in the fact that the roll with a lower peripheral speed is moved in the direction of rolling forward with each pass by an amount equal to the length of the deformation zone in this pass. The method allows to obtain a high band smoothness. 1 ill., 1 tab.

Description

The invention relates to ferrous and nonferrous metallurgy, and more specifically to methods for rolling a metal strip in drive rolls.

The purpose of the invention is to improve the quality of the strip by removing the gutter defect.

The rolling strip is carried out in drive rolls (see drawing) rotating at different peripheral speeds. The roll axes are displaced relative to each other horizontally, and before each pass, the roll having a lower peripheral speed is moved in the direction coinciding with the rolling direction to the distance G, where I is the length of the deformation zone in this pass.

In the proposed method, displacing the driven roll in the rolling direction results in equalization of the broadening at the contact with both rolls, which helps prevent the formation of a groove of the strip.

Since the compression of the strip occurs in the deformation zone, the length of which can be determined by the Hitchcock formula

, YRuh + R p

where Ah is the absolute compression band;

v is the Poisson's ratio;

E is the modulus of elasticity of the material of the roll;

p is the contact voltage at the deformation zone,

This effect of the roll displacement appears only in the range I.

The drawing shows the pattern of movement of the rolls.

Example. The proposed method of rolling a metal strip will be tested on a PV-200 mill with a barrel diameter of 180 mm. As a starting material, a steel strip of grade 08 KP with a size of 0.5x80 mm in the annealed condition is used, there is no flatbed chute.

Rolling is carried out in a symmetric () and asymmetric (, 034) reO

ate yu

W 00

Benches with a symmetrical arrangement of the rolls (a 0) and with the lower roll offset against (a -1.5 mm) and along the direction (a + 1.5 mm) of rolling, In the case of, 034 the lower roll is driven ,.

The results of the experiments are given in the table.

From the analysis of the comparative data, it can be seen that the proposed method of rolling a metal strip prevents the formation of a groove of the strip due to the displacement of a roll having a lower circumferential speed in the direction coinciding with the direction of rolling. Using the proposed method for 0

five

allows to obtain products of particularly high flatness.

Claims (1)

The invention of the method of rolling a metal strip, including the deformation of the metal in the rolls, rotating with different peripheral speeds, the axes of which are displaced relative to each other horizontally, and moving the roll at a lower peripheral speed before each pass, characterized in that by eliminating the gutter defect, the roller is moved along the rolling direction by an amount equal to the length of the deformation zone in the pass. 1.0 1.0 + 1.5 -1.5 -1, uh + 1.5 0.1-1.0 0.5-1.0 1.0-1.5 0.0 felling to the roll, offset in the direction of rolling from the roll, offset in the direction opposite to the direction of rolling there is no roll for shifting in the direction of rolling a 0 ... l