Analysis of Edge Drop Control Performance of Work Roll Contour on Six-high Cold Rolling Mill

doi:10.3901/JME.2019.12.083

Abstract

Abstract: Tapered work roll is an effective measure of six-high roll mill to reduce edge drop but its design criterion is not adequately investigated. Firstly, Based on analysis of previous roll stack's elastic deformation theories, the influence function method based on the partitioned matrix iteration scheme is proposed:Influence Function matrix solution for the six-high roll stack is founded, and by partitioning the matrix solution, the coefficient matrix with the smallest condition number is proposed as the outermost iteration. By this iteration scheme, the results are in better agreement with Finite Element Method, which makes it an optimal tool for intensive presetting analysis. Secondly, the proposed method is used to analyze the differences in control properties between different curve heights and tapered slopes of work roll contour. Results show that a higher curve height is beneficial for the edge drop control ability, but strongly coupled with crown control. The tapered slope has limited influence on the edge drop control effect, but a smaller slope is beneficial to decouple edge drop control and crown control. Finally, based on these laws, a new contour is designed and utilized into industrial line, and percentage of edge drop smaller than 5 μm is further improved. The results show that through partitioned matrix iteration scheme, elastic deformation of rolls stack can be accurately calculated. The results also suggest that a large curve height and a small tangent slope is effective to improve the edge drop control performance of work roll contour.

Key words: elastic deformation, flat sheet rolling, influence function method, roll contours, UCMW cold mill

CLC Number:

TG333

FENG Xiawei, WANG Xiaochen, YANG Quan, SUN Jiquan. Analysis of Edge Drop Control Performance of Work Roll Contour on Six-high Cold Rolling Mill[J]. Journal of Mechanical Engineering, 2019, 55(12): 83-90.

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