Abstract: Taking the injection mold of a large diameter plastic cap as an example, based on the analysis of the structural characteristics and application requirement of the plastic part, the side core-pulling mechanism with angular slide pole was introduced. The mold structure, work processes, angular slide pole design, and distance calculation of the core-pulling mechanism were illustrated. Production practices proved that the injection mold was reasonable in structure, reliable for operation, flexible of the core-pulling mechanism movement, excellent in quality of the molded part, and suitable for high-volume automated production. A new idea for the injection mold design of similar plastic parts was given.

Key words: injection molding, mould, angular slide pole, pre-pulling mechanism, plastic part