Abstract: Taking an interior trim part in Bentley automobile as an example, the injection molding principle for bicolor plastic parts was analyzed. Because the powder of opening mould cannot be used for core-pulling, a slide driven by an ejector plate was designed. A cooling water channel between slides was designed to make it apart from the interior. Moreover, the multiple pin-point gates were designed to overcome the difficulty of ejection. The results indicated that the structure of designed mould in this work was reasonable and reliable, and it could meet the requirements of production of bicolor injection-molding parts.

Key words: bicolor injection mould, automobile interior trim part, design, slide driven by ejector plate