基于数值模拟的粉末注射成形模具结构优化设计

The optimal design of mold structure in powder injection molding based on the numerical simulation

在粉末注射成形过程中,模具结构的设计合理与否对成形质量和效率都有决定性影响。在基于数值模拟的基础上导出了粉末注射模具的浇注系统优化设计模型,并在MODEFLOW软件模拟和工艺实验中得到验证。结果表明优化后的模具在锁模力和成形周期方面都明显下降,生坯成形密度明显提高且密度方差明显减小,同时有效减少了试模次数,提高成形效率。

The quality of the green and the shaping efficiency are affected by the mold structure during the course of powder injection molding（PIM）.It based on the numerical simulation,the mathematic model for the optimization design of the gating and runner system in PIM mould is constructed.The method is testified by the Moldflow software and the experiment.From the result,it is suggested that the clamp force and the shape cycle are clearly decreased,the green is densified and the samples’density error of the green is decreased after the optimal design of the mold structure.Furthermore,the number of trial mold is reduced and the shape efficiency is improved.