关键词: 复合形法, 工艺优化, Moldflow, 曲面重构, 变形预补偿

Abstract: In view of the problems warping of thin-wall injection molding products,a complex method molding parameters optimization was proposed based on the plastic deformation pre-compensation method.The influence of the mould structure,material characteristic parameters and process parameters on the injection molded parts warping was comprehensively considered,and the different molding parameters with the regression equation between the warping was fitted through iterative fitting.The maximization of warping deformation of injection part was realized.The Moldflow plastics insight warping analysis was used to output reverse models with different scale factors,and the warping compensation value was used to evaluate the anisotropy error of reverse model nodes.To obtain high-quality reverse compensation plastic parts surface,the non-uniform rational B-spline surface combined with deformation pre-compensation principle was used to correct the deformation error of plastic parts surface by the optimal fusion point of reverse model surface corresponds to the discrete point of initial model surface.The accuracy and feasibility of the proposed method were verified by experiments with a practical thin-wall fan.

Key words: complex method, process optimization, Moldflow, surface reconstruction, deformation pre-compensation