For the injection mold structure of transparent plastic cover shell, point gate feeding is adopted.

Taking air-conditioner compressor rotor as an example, the structural design key points and working process of three-plate pin-point gate die-casting die are stated in details, combining with author's years experience, applying InteCAST CAE software to do dynamic analysis, the feasible and practical runner system project is determined.

By using pin-point gate, appearance quality of the product is improved; by using inner and outer side-core slides and angled-lift structures,the layout of the mold is made reasonably and the difficulty of demoulding is solved.

There are two structure characteristics were put forward,including the integer side core-pulling mechanism of the half block with mold cavity and the demoulding mechanism of the pin-point gate using single parting surface.

The removal of the condensed material in runner of the traditional typical structure of point gate of injection moulding was difficult when the cavity bottom of main runner was deep and long.

A point gate was used for feeding in the injection mould for the transparent plastic box lid.

Through the technological analysis of the camera s front shell,introduced the design steps of injection mold based on Pro/E,and details of the structure of injection mould and the design process,The design points of lifters and the point gate were stated in detail.