基于正交试验的声学谐振腔平面度与同轴度控制分析

Analysis of Flatness and Roundness of Acoustic Resonant Cavity Based on Orthogonal Test

针对某35%短玻纤增强聚丙烯(PP)的声学谐振腔,利用Moldflow模拟注塑过程并采用宏功能计算其焊接面的平面度及进出口圆管的同轴度,并设计正交试验探究优化工艺参数组合。基于高级浇口定位器,计算得到流动阻力、浇口匹配性结果,确定最佳浇口位置。通过正交试验得到各工艺参数对平面度的影响程度排序为:保压压力>熔体温度>保压时间>模具温度>注射时间;对同轴度的影响程度排序为:保压时间>注射时间>模具温度>熔体温度>保压压力。综合平面度与同轴度的分析结果,得到优化工艺参数组合为A_(3)B_(3)C_(2)D_(3)E_(4),即保压压力为30 MPa,保压时间为10 s,熔体温度为235℃,注射时间为1.8 s及模具温度为65℃。采用优化工艺计算得到平面度及同轴度分别降低28.3%、25.5%,满足设计指标要求。实际试模样品满足设计要求,验证优化工艺的合理性。

For an acoustic resonant cavity of 35%short glass fiber reinforced polypropylene(PP),Moldflow was used to simulate the injection molding process and the macro function was used to calculate the flatness of the welding surface and the roundness of the inlet and outlet round pipes.The orthogonal test was designed to explore the optimization of the process parameters.Based on the advanced gate locator,the flow resistance and gate matching results were calculated to determine the best gate position.The order of influence degree of process parameters on flatness obtained by orthogonal test is:holding pressure>melt temperature>holding time>mold temperature>injection time.The order of influence degree on roundness is:holding time>injection time>mold temperature>melt temperature>holding pressure.Based on the analysis results of flatness and coaxiality,the optimized process parameter combination is A_(3)B_(3)C_(2)D_(3)E_(4),that is the holding pressure is30 MPa,the holding time is 10 s,the melt temperature is 235℃,the injection time is 1.8 s and the mold temperature is 65℃.The flatness and coaxiality are reduced by 28.3%and 25.5%respectively using the optimized process calculation,which meets the design index requirements.The actual test sample meets the design requirements and verifies the rationality of the optimization process.