Research and Optimization for Transverse Thickness Difference Control Strategy of UCMW Cold Tandem Mill

Abstract

Transverse thickness difference is a key index of plate shape for electrical steel product. This paper analyzed and optimized original automatic control system for transverse thickness difference of MH UCMW rolling mill. By adding Multi-points assessment in edge drop region, steep drop width is reduced, and system yield is improved; By optimizing rigid control strategy into flexible control strategy, using three stands control instead of two stands, and rationally allocating each stand load for edge drop control, transverse thickness difference quality level is improved, and rolling stability is promoted. Based on control system optimization, control ability for transverse thickness difference is significantly improved, head-tail ultra gauge length is shortened from 110 meter to 50 meter, and transverse thickness difference high-quality ratio is improved from 35% to 87%.

The Causes Analysis for the Surface Wrinkle Defects of Cold-Rolled Strip and the Control Measures

“…UCMW cold rolling mill of Qian-an steel is equipped with the automatic control system of the edge drop corresponding to the K-WRS edge drop control technology, has a strong ability to control the edge drop [2], and the strip edge drop volume can be controlled at less than 10 µ m, so there is no wrinkle, which is caused by sharply edge drop. But on volume measurement of edge wrinkle steel, found that about 15mm from the side portion, there is a certain degree of relative thickening.…”

Research on Shape Control Characteristics of Non-oriented Silicon Steel for UCMW Cold Rolling Mill

“…The UCMW (Universal Crown Mill with Work roll shifting) cold rolling mill, developed on the basis of the HC (High Crown) rolling mill, is the most representative one. It has been widely used in rolling non-oriented silicon steel with strict quality requirements because of its great performance in shape control [1][2][3][4]. The UCMW cold rolling mill is equipped with a work roll positive and negative bending roll mechanism and an intermediate roll positive bending roll mechanism to enhance the regulating ability of the bearing roll gap crown.…”