辊式矫直中H型钢断面畸变的仿真分析

现有的H型钢矫直理论在求解压下量时未考虑断面畸变现象,无法取得理想的矫直效果. 本文应用有限元分析软件ANSYS建立了H型钢辊式矫直时一个矫直单元的有限元仿真模型,研究分析了典型规格H型钢矫直时断面畸变及其主要影响因素和影响规律. 结果表明,H型钢矫直时断面畸变主要是腹板凹陷,其对矫直压下量设定的影响不可忽略;而影响腹板凹陷量的主要因素包括矫直压力、侧向间隙和矫直辊圆角半径等,三者的影响规律均为相应参数的二次函数形式. 最后给出了典型规格H型钢的矫直腹板凹陷量回归公式. 在实际矫直时,实际设定压下量应为理论压下量与腹板凹陷量之和,可取得理想的矫直效果.

Finite element simulation of section deflection during H-beam roller straightening

The section deflection of an H-beam is not considered in the traditional straightening theory, so it is difficult to get desired straightening effect. A finite element model of one straightening unit was established with ANSYS, the straightening process was simulated and the section deflection of the H-beam was studied. The results show that the section deflection of the H-beam in straightening process should not be neglected, in which web falling plays a dominating role. The main factors which influence web falling include straightening force, gap between roller outside and beam inner side and roller-outside-corner radius, and the varying regulation of web falling is quadratics of the relevant factors. At last, a regressive formula of web falling was presented. In order to obtain an ideal straightening effect, the actual bending deflection should be the sum of the theoretical bending deflection and the web falling.