注塑齿轮模具型腔设计方法分析

Analysis on Design of the Cavity of the Injection Mould for Plastic Gears

针对注塑齿轮模具设计精度问题,着重探讨了热变形的影响。采用ANSYS软件对塑料齿轮热变形进行仿真,得到了注塑齿轮在临界固化温度与常温下的齿型变化,通过对比分析指出采用形状放大的方法进行注塑齿轮模具设计会产生较大误差。提出了采用热变形分析得到的齿轮廓线作为注塑模具的最佳型腔,直接编程输入线切割机床可加工出最佳的注塑齿轮模具腔廓面。

Considering the design accuracy of the injection mold of plastic gears, the effect of the thermal deformaion on the accuracy was emphatically discussed in this paper. The thermal deformation of a plastic gear was simulated by using ANSYS and the shape changes of the teeth were obtained between the solidification temperature and room temperature, the results showed that a big error was caused by enlarging the shape of the gear in the design of the injection mold. And the tooth profile obtained by thermal deformation analysis was the most accurate mould cavity, the best-shaped mold cavity can be machined by numerical control WEDM programming.