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The design of injection die on the upper cover of clamshell phone is introduced. The dual-plate die has side gate for opposite glue injection, the parts are ejected by ejector pin, the side reversed buckle contains three blocks, the reversed buckle at flip shaft consists of two inner sliders, and all the eight inner reversed buckles are made up of inclined pushing rods, and the cooling system embraces "U" shaped cooling waterway. Its application in practice has proved the reasonable die structure, smooth remolding, and qualified plastic part design.

This article introduces the injection mould design of mobile phone back shell. The mould adopts 3-plate mold structure, pin-point gate for feeding in the glue, ejector pin and pieces for stripping. The under-cut at the side edge adopts 3-side sliding block molding, and the cooling system adopts “U”-shape coolant gallery. It is proved by production practice that the mould structure is reasonable, stripping smoothly and the plastic parts quality meets the design requirements.