基于DFM与CAE的显微镜前护罩零件的热流道模具设计

Design of Hot Runner Mold for Microscope Front Cover Parts Based on DFM and CAE

针对显微镜前护罩零件薄壁,有两处加强筋和boss柱及端面有凸起、侧面有斜口的特征,设计显微镜前护罩零件的热流道模具,通过面向制造设计(DFM)分析,对显微镜前护罩产品塑件的结构、浇注系统、冷却系统、模具整体结构及工作过程等进行分析,根据DFM与CAE分析结果可以预判塑料件在成型过程中可能出现的问题,避免塑料件出现缩水、应力痕、较薄、较细,易变形易断特征。设计斜抽芯+滑块实现侧面脱模。在boss柱与斜面之间设计定距拉钩机构,利用斜顶块与前装饰板斜面之间滑动,与boss柱分离,解决了外观面缩水问题和塑料件内部因空间小限制脱倒钩的问题。各机构的模具冷却系统的设计,使得模具在使用过程中温度均匀,延长模具使用寿命。模具整体结构布局合理、运动顺畅,成型塑料件符合产品和设计要求,生产制造成本较低,为同类塑料模具设计提供有益参考。

Aiming at the characteristics of thin-walled parts of the front cover of the microscope, there are two stiffeners and boss columns and the end face has a bulge, and the side has an oblique mouth, the hot runner mold of the front cover of the microscope is designed. Through the analysis of design for manufacturing(DFM), the structure, gating system,cooling system, overall structure and working process of the plastic parts of the front cover of the microscope are analyzed. According to the results of DFM and CAE analysis, the problems that may occur in the molding process of plastic parts can be predicted to avoid shrinkage, stress marks, thinness, fineness, easy deformation and fracture characteristics of plastic parts. Design oblique core-pulling + slider to realize side demolding. The fixed distance hook mechanism is designed between the boss column and the inclined plane. The sliding between the inclined top block and the inclined plane of the front decoration plate is separated from the boss column, which solves the problem of shrinkage of the appearance surface and the problem of decoupling due to the small space inside the plastic part. The design of mold cooling system of each mechanism makes the mold temperature uniform during use and prolongs the service life of the mold. The overall structure of the mold layout is reasonable, smooth movement, molding plastic parts meet product and design requirements, low manufacturing cost, provide a useful reference for similar plastic mold design.