By analying the structure of battery box, a kind simple and the convenient processing mold structure is determined, problem of inside core-pulling is solved, moreover, it can reduce the mold cost greatly.

The handle with turns on plastic fittings has a special external form, the inside counterbore of the short cylinder-shaped turret head on its end needs inside core-pulling, this paper elaborately introduced the characteristics of the die design and the design key points and attention items of employing inclined push rod structure.

Design of injection mould for a part with internal concave;

Through analyzing on characteristics of the compound material shell, proposed the activity block molding and inside slide block demoulding mechanism, the mold structure was simple and clever, not only reduced the mold cost and the development cycle, more over the mold life was improved.