汽车蓄能器壳体温挤压仿真及参数优化

Simulation and parameter optimization on warm extrusion for automobile accumulator shell

以汽车蓄能器壳体为研究对象,针对实际生产中出现的筒壁质量差、变形的问题,采用有限元法和正交试验法对工艺进行优化。首先,分析温挤压成形过程,确定了影响零件质量及模具寿命的关键工艺参数;其次,以筒壁内外温度差和凸模磨损为评估指标,通过Deform-3D对各工艺参数进行了正交试验仿真,获得了各参数对评估指标的影响趋势,综合分析后确定了最优温挤压工艺参数,即模具预热温度为280℃、凸模挤压速度为45 mm·s^(-1)、凸模切入角为14°、凸模端面直径为Ф27.8 mm。最后,根据数值仿真结果,进行了蓄能器壳体的实际温挤压生产,零件筒壁质量好,无刮伤等缺陷,验证了试验结果的可靠性。

For the automobile accumulator shell,aiming at the problems of poor quality and deformation of cylinder wall in actual production,the process was optimized by finite element method and orthogonal test method.Firstly,the process of warm extrusion forming was analyzed,and the key process parameters affecting the quality of parts and mold life were determined.Secondly,taking the temperature difference between inside and outside of cylinder wall and punch wear as evaluation indexes,based on orthogonal experiment,each process parameter was simulated by Deform-3D,and the influence trends of process parameters on evaluation indexes were obtained.After comprehensive analysis,the optimal process parameters of warm extrusion were determined as the mold preheating temperature of 280℃,the punch extrusion speed of 45 mm•s^(-1),the punch cut in angle of 14°,and the diameter at punch end surface ofФ27.8 mm.Finally,according to the numerical simulation results,the actual warm extrusion production of accumulator shell was carried out,and the wall quality of the part was good without scratch and other defects to verify the reliability of the test results.