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基于ANSYS软件,采用间接法对多层套扁挤压筒进行了热-力耦合数值模拟,分析了扁挤压筒在内压、预紧力及热载荷作用下的温度场和应力场;通过正交实验法,分析了工作内压、过盈量、衬套数、内孔尺寸、整体尺寸及材料对扁筒中热应力的影响。结果表明:各层套的温度分布不均匀,呈现出由外衬套向内衬套增大的趋势,且外层的温度分布比内层与中层均匀;热应力的存在使扁筒的等效应力更均匀;增大工作内压和过盈量会使扁筒的等效应力和接触应力均增大;选取三层套、合适的内孔和中衬的尺寸以及经济合理的模具材料更有利于提高筒的装配效果和降低其等效应力。模拟分析获得了较为合理的工艺参数,为优化扁筒的结构设计和装配提供了参考依据。
Based on the ANSYS software, the numerical simulation of thermo-mechanical coupling of multi-layer flat extrusion cylinder was carried out by indirect method. The temperature field and stress field of the flat extrusion cylinder under internal pressure, preload force and thermal load were analyzed. Orthogonal experiment method was used to analyze the effect of internal pressure, interference, bushing number, bore size, overall size and material on the thermal stress in the flat cylinder. The results show that the temperature distribution of each sleeve is not uniform, and the temperature increases from the outer sleeve to the inner sleeve, and the temperature distribution of the outer layer is more uniform than the inner and middle layers. The existence of thermal stress makes the equivalent stress More uniform; increase the working pressure and the amount of interference will make the cylinder equivalent stress and contact stress are increased; select three sets of sleeves, the appropriate size of the hole and the lining and the more economical and reasonable mold material Improve tube assembly and reduce its equivalent stress. The simulation analysis obtained more reasonable process parameters, which provided a reference for optimizing the structure design and assembly of the flat cylinder.