Method for Improving Beading Defects of Cold-rolled Strip Steel

Abstract

The invention discloses a method for overcoming rib raising drawback of a cold-rolled steel strip, which controls the shape of a cold continuous rolled plate in a micro / medium wave plate shape mode. The micro / medium wave plate shape mode is controlled by four parameters, namely a, b, X0 and gain; X0 is equal to B / 2-A5Dw-A6SU-A7h, wherein B represents the width of the steel strip, Dw represents the diameter of a working roll, SU represents the roll jumping position of an intermediate roll, h represents the thickness of the outlet of the steel strip, and A5, A6 and A7 are constants; a is equal to -1, b is equal to 0, and gain is between 13 and 18, the width of the cold-rolled steel strip is 1000mm, 1200mm, and 1250mm, the thickness is 0.35-0.5mm, and the width and the thickness have small fluctuation range. In the invention, the micro / medium wave plate shape mode is adopted, micro / medium waves are used to cover narrow waves, the over-centralized distribution of stress of the steel strip in the middle of the steel strip is relieved, the drawback of rib plate raising in cold-rolled steel strip in a rolling process is solved, and a better effect is achieved.

Description

technical field [0001] The invention belongs to the field of processing control of metal materials, in particular to the field of production of cold-rolled strip steel. Background technique [0002] Ribbing defect refers to the phenomenon of bulging on the surface of the steel coil due to the accumulation of local high points and local wave shapes layer by layer during the coiling process. When the amount of ribbing is large, additional small waves will be generated after the steel coil is uncoiled, which seriously affects the performance of the product. According to different positions, the ribs can be divided into three types: unilateral ribs, middle ribs, and double-sided ribs. Generally, the ribbing rate of cold-rolled strip can be reduced to about 1.5% by controlling the large crown, small wedge, appropriate local high point and roll shifting setting of the hot-rolled strip section. [0003] Masteel's CSP process acid tandem rolling production line includes four stand...

AI Technical Summary

Problems solved by technology

It is still difficult to eliminate the ribbed plate shape defect in the middle of the strip steel by controlling the large crown, small wedge shape, appropriate local high point and roll shifting setting of the hot-rolled strip steel section.

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