Abstract: On basis of structural characteristics and appearance requirements for main bodies of auto central channels, a large-sized side core-pulling injection mold equipped by a hot runner system with two sequence valves was designed in terms of the design considerations and experiences of injection mold forming parts, side core-pulling mechanism, gating system, temperature control system, guiding system and stripping ejection system. Injection molding tests indicated that the mold was safe and stable during motion due to its reasonable structure, and its forming cycle and precision met the requirements for our design. The cast study demonstrated that the productivity increased by approximate 10 % when the forming cycle of the mold was controlled at about 60 s.

Key words: main body of auto central channel, injection mold, side core-pulling mechanism, sequence valve, hot runner system