Cold straightening process for improving straightening capability through reduction of number of working rolls of straightener

Abstract

The invention discloses a cold straightening process for improving the straightening capability through the reduction of the number of working rolls of a straightener. In the step of the first pass large plastic deformation straightening, the number of the working rolls actually performing straightening is determined; one or two upper working rolls on the outlet side do not perform straightening; roll gaps of the inlet and the outlet are set; and the roll gap of the inlet is calculated according to a secondary model and based on a condition that a steel plate plastically deforms by 80%. In the step of the second pass small plastic deformation straightening, all the working rolls perform straightening; the roll gap of the inlet is calculated according to the secondary model and based on a condition that the steel plate plastically deforms by 65%; and the roll gap of the outlet is designed to be the thickness of a plate to be straightened. According to the invention, through the reduction of the number of the working rolls actually performing straightening on the outlet side of the straightener, the load of the straightener is reduced, the rolling reduction of the inlet of the straightener is increased, the maximum bending curvature of the steel plate is increased, the straightening capability of the straightener is enhanced, and the straightening qualified rate of the steel plate is improved.

Description

technical field [0001] The invention belongs to the field of steel rolling, and relates to a cold straightening process for improving straightening capacity by reducing the number of work rolls of a straightening machine. Background technique [0002] Roller straightening machine makes use of the different setting values ​​of the entrance and exit roll gap to make the upper roll box of the leveler tilt. The traditional straightening process is that the exit roll gap is the same as the thickness of the steel plate to be straightened (such as figure 1 shown), the entrance roll gap is set according to the actual curvature of the steel plate, the greater the degree of curvature of the steel plate, the smaller the entrance roll gap, and the greater the plastic deformation of the steel plate during the straightening process (such as figure 2 shown), the better the straightening effect. There are two factors affecting the total straightening force of the straightening machine: on...

AI Technical Summary

Problems solved by technology

With the increase of the entrance reduction, the straightening force of the straightening machine continues to increase. When the straightening force reaches the rated straightening force of the straightening machine, the upper roll box will automatically open for protection, and the straightening cannot continue

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