Taking fork trestle product with undercut and inner treated as object,the injection mould of the product was de-signed. According to the characteristic of the undercut in the internal and external side of the product top and the inner thread in bot-tom of the product coexisted,through the design of half slider and gear thread demoulding mechanism,four key components such as the mould carrier component,fixed mould half slider component,fixed mould pre core-pulling component and gear thread demould-ing component were built,the gear thread demoulding component included four subcomponents,which are thread demoulding sub-component,middle two-stage transmission subcomponent,middle direct transmission subcomponent and rack drive subcomponent respectively. The automatic demoulding of the fork trestle injection mould was achieved through the design of four mould open-close movements,which realized the automation production of the plastic products on the basis of high quality.%以带有倒扣与内螺纹的叉形体支架产品为对象,进行了相应的注塑模具设计.针对产品上端内外侧面倒扣特征及下端内螺纹特征同时存在的特点,通过设计哈弗滑块与齿轮脱螺纹机构,构建了模架组件、定模哈弗滑块组件、定模先抽芯组件和齿轮脱螺纹组件等4个关键组件,其中齿轮脱螺纹组件包括4个子组件,其分别为脱螺纹子组件、中间二级传动子组件、中间一级传动子组件和齿条驱动子组件.通过模具4次开闭模动作的设计,实现了叉形体注塑模具的自动脱模,在确保注塑产品质量的基础上实现了生产自动化.
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