Research and application of flatness target curve setting model for cold-rolled steel strip
WANG Peng-fei1, JIN Shu-ren1, XU Hao1, LI Xu2
1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, Hebei, China; 2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004, Liaoning, China
Abstract：The flatness target curve setting model refers to the basic process setting model in cold rolling flatness control, which directly determines the actual control effect of strip steel. Since the current flatness target curve setting model is hardly adapted to the changes of specifications and process parameters, it fails to accommodate the requirements of flatness control with frequency switching of multiple varieties and specifications, which results in the decrease of product qualification rate. In purpose of improving the fitness of flatness target curve to the actual flatness, the generalized equation of flatness target curve in the form of 8 order polynomial was established based on the basic flatness target curve and the compensation curve using the functional modeling method. To decrease the difficulty of setting coefficients and to accommodate the production requirements of the full range strip steel, the linear function normalization algorithm was used to normalize flatness target curve and multiply the corresponding gain coefficients to obtain the final model of 8 order flatness target curve in normalized form. The domestic 1 450 mm five-stand, six-roller cold rolling mill as an application example shows that the normalized form of flatness target curve reduces the standard deviation of plate shape by 50% and 30% in stable rolling process and rolling process of acceleration stage and deceleration stage, and ensures stable indexes, providing a solution for obtaining high-quality cold-rolled strip products.
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2022, Vol. 32 
