塑性变形率对辊式矫直板材的影响

Effect of Plastic Deformation Rate on Plate Steel During Roller Leveling

为了深入研究辊式矫直过程的变形特点,采用弹塑性差分的曲率积分方法,模拟研究塑性变形率对矫直效果的影响.提出塑性变形率的离散计算方法,针对单值初始曲率条件下不同的压下制度组合,计算得到塑性变形率与残余曲率以及平均残余应力之间的关系.从理论上证明塑性变形率不能作为判定矫直效果的单一标准,由于在线确定初始曲率十分困难,因此应该使得塑性变形率达到较大值(80%左右),另外给出单值初始曲率条件下最优化的矫直条件.

To investigate the deformation behavior of plate steel during roller leveling in depth, the curvature integration by elastic-plastic differences was introduced to simulate and analyze the effect of plastic deformation rate on the leveling results. A method of dispersion calculation was proposed for plastic deformation rate, thus getting the relationships between the plastic deformation rate, residual curvature and average residual stress for different combinations of reduction schedule under conditions of single-valued initial curvature. The plastic deformation rate cannot be justified theoretically that it is the only criterion for leveling results. However, because the initial curvature is very hard to determine on line, the plastic deformation rate has to come up to about 80 % after roller leveling. In addition, the optimized leveling conditions are pointed out for the single-valued initial curvature.