基于CAE技术的油泵隔热罩外壳的工艺优化

Process Optimization of Oil Pump Heat Shield Shell Based on CAE Technology

油泵隔热罩外壳的平整度是影响其隔热性的关键因素,结合目前油泵隔热罩外壳的翘曲变形问题,文章采用CAE数值模拟技术进行了工艺优化。为了保证模拟仿真的准确性,对隔热罩外壳注塑初始方案进行模拟仿真发现,Z方向最大翘曲变形量为2.382 mm;采用三坐标测量仪获得塑件边缘均匀的12个点的实际Z方向翘曲变形量,其中,最大翘曲量为1.93 mm。通过对比12个点的模拟与实际测量翘曲量发现,两者结果变化趋势相同,并且模拟结果处于实际结果±30%的误差范围内。通过对翘曲结果与塑件结构的分析发现,翘曲变形严重是由于塑件各部分的充型流动不均,因此,采用CAE对不同数量与形状的内浇口注塑方案进行分析,获得了低翘曲变形量的注塑工艺方案。优化方案将塑件边缘点的翘曲变形量控制在了±0.5 mm的误差范围内,模拟最大翘曲量由2.382 mm下降为0.6438 mm,与实际测量值1.92下降为0.68 mm相一致。利用该注塑工艺对实际模具进行修模注塑,获得了满足产品需求的低翘曲变形量的塑件。

The flatness of the oil pump heat shield shell was the key to its heat insulation.For the warpage and deformation of the existing oil pump heat shield shell,CAE numerical simulation technology was used to optimize the process.In order to ensure the accuracy of the simulation,the initial injection plan of the heat shield shell was simulated,and it was found that the maximum warpage in the Z direction of the part was 2.382 mm.A three-coordinate measuring machine was used to obtain the actual Z-direction warping deformation at 12 points uniformly on the edge of the plastic part.The maximum warpage was 1.93 mm.Comparing the simulation of 12 points with the actual measurement of warpage,the change trend of the two results was the same,and the simulation result was within the±30%error range of the actual result.Through the analysis of the warpage results and the structure of the plastic part,it was found that the uneven filling flow of the plastic part was the essential cause of the serious warpage deformation.Therefore,CAE was used to analyze the injection molding schemes of inner gates with different numbers and shapes.The injection molding process plan with low warpage deformation was obtained.The warpage of the edge points of the plastic part was controlled within the range of±0.5 mm,and the simulated maximum warpage was reduced from 2.382 mm to 0.6438 mm,which was consistent with the measured value from 1.92 to 0.68 mm.This injection molding process was used to repair the actual mold and a low warpage plastic part was obtained which meets the needs of the product.