Optimization of varying curvature profile of two-roll bar straightener
MA Li-dong1,2,HUANG Qing-xue1,2,CHEN Shuo1,MA Hao-xi1
(1. Coordinative Innovation Center of Taiyuan Heavy Machinery Equipment, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China 2. Key Laboratory of Metallurgical Equipment Design Theory and Technology of Shanxi Province, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China)
Abstract:Based on the problem that requirements of the high straightness accuracy and the surface quality of the high quality bar cannot be satisfied at the same time,a variable curvature roll design method was proposed. The straightening roller was composed of multi parts,and the curvature was increased uniformly from two ends to the center of the straightening roller according to a given value. This method can improve the contact unevenness caused by the curvature mutation during the contact between the straightening roller and the bar,so as to achieve the goal of improving the surface quality. Further,the curvature analysis model of the whole process of the two-roll bar straightening process was established. The theory was verified by the field roll profile and process parameters,and the accuracy of straightening was consistent. Through the continuous bending and the springback analysis of the roller straightening process with different curvature ranges,the principle of optimizing the variable curvature roll profile was obtained as following:The variable curvature range can straighten various specifications of the bar in the product outline and has a reasonable curvature margin for the straightening demand,considering the fact that the bending curvature decreases due to the wear of the straightening roller. Numerical method was adopted to verify the roll shape design method,and numerical results showed that the straightening accuracy of the bar was 0.54 mm/m,which satisfied the requirement of 1 mm/m in the production site. The results showed that the roller design method can meet the need of the straightening bar.
马立东,黄庆学,陈 硕,麻浩曦. 棒材二辊矫直机变曲率辊型优化[J]. , 2018, 53(9): 45-52.
MA Li-dong,,HUANG Qing-xue,,CHEN Shuo,MA Hao-xi. Optimization of varying curvature profile of two-roll bar straightener. Iron and Steel, 2018, 53(9): 45-52.
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