RU1784336C - Strip straightening method - Google Patents

Abstract

SUMMARY OF THE INVENTION: A strip is passed between centering and bending rollers. When the strip is moved relative to the rollers, it is displaced in its own plane in the transverse direction with the concave edge stretched by a certain angle, the magnitude of which depends on the width and crescent shape of the strip. 1 ill.

Description

The invention relates to the finishing of strip products and can be used in the manufacture of cold formed sections.

A known method of straightening a strip with alternating bending with the application of a front tension of a certain value and varying the bending arrow depending on the thickness and yield strength of the metal.

There is also known a method of straightening a strip, in which a further bending of its cross section by a certain amount is carried out.

As a prototype of the invention, a strip straightening method is used in which it is centered by rollers in contact with the edges of the strip and passed between the bending rollers, the strip being displaced in the transverse direction in its plane by moving one group of centering rollers relative to another (3). The disadvantage of this method is the ability to exit after editing strips with high sickle shape.

The purpose of the invention is to improve quality by reducing the crescent shape of the strip.

This is achieved by the fact that the sickle-shaped strip during editing is shifted in the transverse direction with an extension of the concave edge by an angle:

“Arcsln (1,0 ... 1,2) SB-, where S is the magnitude of the crescent of the strip in mm per 3 m of length;

B - strip width, mm.

The essence of the invention is to unevenly stretch the opposite edges of the strip defined in the bending rollers at a certain angle to their axes, which eliminates the original crescent shape of the strip.

The drawing illustrates the implementation of the proposed method.

The sickle-shaped strip 1 of width B, is bent in its plane (to the right in the figure), before entering the bending rollers 2 it is shifted in the transverse direction along the axes of these rollers xx to the side opposite to the bending (left) with the centering rollers 3 at an angle a relative to the direction of editing - yyixx axes. At

cl

with

Nj 00

GOь GO SA О

this causes the extension of the shorter (concave) edge with the elimination of crescent. At the exit of the rollers 2, the strip is centered by the rollers 4. The crescent value S is measured before editing in mm over 3 m of the strip length.

PRI me R 1. A strip with a width of 400 mm and with an initial sickle shape of S 15 mm / 3 m before entering the bending rollers is shifted in the transverse direction by an angle: ..

"" ArcslnSB-arcslnl5 -400 - 0.3 °.

PRI me R 2. The strip with B 500 mm and S 20 mm / 3 m is shifted by an angle:

a-1.1 -20 -500- 10.6 °.

Example 3. A strip with B 600 mm and S ЗОмм / Зм is shifted by an angle: a-1.2 30 600 - 1.0 °.

0

Claims (1)

The claims A method of straightening a strip in which it is centered by rollers in contact with the lateral edges of the strip and passed between the bending rollers, the strip being shifted laterally in its plane by adjusting the movement of one group of centering rollers relative to another, characterized in that, in order to improve quality by reducing the sickle shape of the strip, it is shifted in the transverse direction with the extension of the concave edge at an angle: a arcsln (1,0 ... 1,2) -S -В - 10J6, where S is the crescent value of the strip mm / 3 m in length; B - strip width, mm.