LG730冷轧管机机架危险位置合理设计是决定其应力高低和寿命的关键。本文在LG730轧机整体建模有限元分析的基础上,重点对机架危险位置的结构形式提出了四种优化方案,通过有限元分析机架危险位置的最大应力明显降低,强度得到了提高。研究结果对LG730机架结构危险位置设计以及其它形式机架都有重要的参考价值。 LG730 cold-rolled tube machine rack dangerous position reasonable design is to determine the level of stress and life of the key. Based on the finite element analysis of the overall modeling of the LG730 rolling mill, this paper puts forward four optimization schemes focusing on the structural form of the dangerous position of the frame. By means of finite element analysis, the maximum stress of the dangerous position of the frame is obviously reduced and the strength is improved. The results of the research have important reference value for the design of dangerous position of LG730 rack structure and other forms of racks.