Abstract: It analyzes the structure of the shell plastic part of the telephone receiver and molding process. Aiming at the characteristics of the front shell and rear cover plastic parts of the receiver including matching production, thinner wall, more stiffener, undercutting and high requirement on the surface quality, it designs the mould for the molding matching plastic part with the single injection. And, it applies the combination of the moving and fixed die inserts, the compound inside and outside entrant demoulding of the slider angle pin and swing rod, open model in order and ejector mechanism of different forms. Meanwhile, it introduces the design of main molding parts, mould gating system, vertical parting core pulling and ejector & reset mechanism. The practice indicates that the mould has the compact structure with the stable and reliable movement. The design planning is reasonable.

Key words: Receiver, Injection mould, Vertical parting, Optimal design