Method for controlling transverse thickness difference of medium-low grade electrical steel

Abstract

The invention discloses a method for controlling transverse thickness difference of medium-low grade electrical steel; hot rolling electrical steel with 2.0-3.0mm of thickness is rolled in a decoiling unit for uncoiling and double-cutting a shearing head, after the electrical steel is welded with the last strip coil by a pinch roll welding machine, the electrical steel is stretched by a stretching-bending straightener and is descaled, and the plate type is improved, and then acid-washing, hot rinsing and drying are carried out, and side shearing is carried out by a trimming machine and then rolling is carried out by feeding into a four-rack six-roller tandem rolling unit through an entry looper of a rolling mill. The working roll shifting, working roll bending force, middle roll bending force and roll crown crown of all racks of the tandem rolling unit are controlled, and the rolling mill tensile force, screw down rate, rolling pressure and the rack tensile force of all racks are controlled, strip steel which is rolled by the last rolling mill of the tandem rolling unit is coiled after being sheared, the coiling tensile force is controlled, and the coiled electrical steel coil is delivered to the designated plate for storage. The control method solves the difficult problem that the transverse thickness difference of the electrical steel is hard to control, and the equipment investment and the production cost are saved, thereby having promotional value.

Description

technical field [0001] The invention relates to a control method, in particular to a method for controlling the high-precision lateral thickness difference of medium and low-grade electrical steel with a thickness of 0.5-1.0 mm, and belongs to the field of cold-rolled strip shape control. Background technique [0002] Low and medium grade electrical steels are mainly used as iron cores of various motors and other electrical components. They are indispensable soft magnetic alloys in electric power, electronics and military industries, and have been widely used. [0003] The main technical indicators for measuring the shape of low- and medium-grade electrical steel sheets include longitudinal (ie, rolling direction) thickness difference and transverse thickness difference. The transverse thickness difference refers to the plate crown and edge thinning. Since the longitudinal thickness control of the cold-rolled strip adopts the current mature AGC technology, the longitudinal t...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of large lateral thickness difference of cold-rolled middle and low grade electrical steel, the present invention provides a method for producing cold-rolled middle and low grade electrical steel with a transverse thickness difference of ≤ 15um using a four-stand six-high UCM rolling mill. There are positive and negative bending of work rolls, positive and negative bending of intermediate rolls and roll shifting of intermediate rolls in the rolling mill to control the shape of the strip.

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