Process method for coating shifting fork with high-temperature special plastic

The invention provides a process method for coating a shifting fork with high-temperature special plastic, which not only solves the problem of poor flowability of the special plastic, but also avoids premature curing of the special plastic, thereby solving the problems of under-injection and physical property reduction of a product and ensuring the size stability of the product after plastic coating. According to the method, a hot runner mold is adopted for forming and plastic coating, meanwhile, a part is heated and then used for forming and plastic coating, and finally, the material is injected into a forming cavity according to the characteristics of special plastic, the flow speed is stabilized at 90-150 mm/s, the injection molding pressure is stabilized at 160-200 MPA, and the surface of the part is coated with the material. 本发明提供了一种用于拨叉高温特种塑料包塑的工艺方法，其既解决了特种塑料流动性差又避免特种塑料过早固化，从而解决了产品欠注、物理性能下降的问题、确保了产品包塑后尺寸的稳定性。其采用热流道模具用于成型包塑，同时将零件加热后用于成型包塑，最后更具特种塑料的特性将流速稳定在90-150mm/s、注塑压力稳定在160-200MPA注入到成型腔内、包覆在零件的表面。