四辊方管轧机机架有限元分析与结构改进研究

Finite Element Analysis and Structural Improvement of Square Steel Fore-Roll Rack

首先根据现有四辊方管轧机机架尺寸数据建立方管成型机组的三维模型,之后把工厂的生产经验和张力减径理论相结合确定机组各项工艺参数。应用显式动力学分析软件对三架方管轧机轧制过程进行仿真,求得钢管所受最大压力大小及出现的时间、位置,从而结合轧制力计算公式得到各架轧机所受轧制力范围。之后把最大轧制力导入有限元软件,对四辊轧机机架进行有限元分析,得到机架在最大轧制力作用下的应力应变分布规律,从而改进机架的薄弱结构,并把改进结果导入有限元软件中进行对比分析。最终在降低机架等效应力的同时,有效降低了机架的自重,且机架变形量增加很小。从而使机架性能得到改善,同时降低了生产成本。

First of all, the 3D model of the square tube forming machine was established by the existing dimension data of the frame of four roll tube mill.Then the every technological parameter was confirmed through the combination of production experience and the tension reducing theory.The process of three square tube mill rolling was simulated by using the software of explicit dynamics, and the biggest pressure and the occurrence time and position on the steel tube were obtained, the scope of each frame mill rolling force was obtained by the combination of rolling force formula. Then the maximum rolling force was imported into finite element software.The finite element analysis was carried out on the four high rolling mill frame,and the distribution rule of the stress and strain was obtained under the maximum rolling farce,so the weak structure of the frame was improved. And the improvement results were imported into finite element software to be analyzed. Finally the frame equivalent stress was reduced, at the same time the dead weight of the frame was reduced effectively,and the frame deformation increase was small,so that the frame performance was improved, at the same time the cost of production was reduced.