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宽厚板轧机组合式机架通过拉杆紧固连接达到与整体式机架相当的力学性能,研究拉杆最优预紧力可有效减小机架窗口变形,从而降低轧辊轴承座挤压受损程度。对营口5 000mm粗轧机组合式机架进行数据测量;利用ANSYS WORKBENCH软件并基于有限元理论对机架进行无预紧力静力学分析;选取拉杆预紧力作为设计变量并设定目标函数,采用基于遗传算法的多目标优化方法对拉杆预紧力进行优化分析。结果表明,在满足机架强度且横梁与立柱不发生分离的条件下,使组合式机架窗口变形量最小的拉杆预紧力即为最优预紧力;组合式机架强度和刚度均得到优化。通过压靠实验测得机架刚度,实验结果与模拟结果误差为5.5%,验证了有限元模拟的可靠性。
The combined frame of the heavy plate mill achieves the mechanical properties equivalent to that of the integral frame through the tie rod fastening connection. Studying the optimal pretightening force of the tie rod can effectively reduce the deformation of the frame window and thus reduce the degree of crushing damage of the roll chock. The data of the combined frame of 5 000 mm roughing mill in Yingkou was measured. ANSYS WORKBENCH software was used to analyze the frame without prestressing static force based on the finite element theory. The preload of the tie rod was selected as the design variable and the objective function was set. Optimization Analysis of Tie Rod Pretightening Force Based on Multi - Objective Optimization Method of Genetic Algorithm. The results show that the optimal pretightening force is the prestressing force of the tie rod which minimizes the deformation of the combined frame window when the frame strength is satisfied and the separation between the beam and the column does not occur. The strength and rigidity of the combined frame are obtained optimization. The stiffness of the frame is measured by pressing test, the error between experimental results and simulation results is 5.5%, which verifies the reliability of finite element simulation.