操控旋钮双色注射成型热流道模具设计

设计了一种旋转式双色注射成型热流道模具用于旋钮盖双色塑件的生产，模具选用四板式3次开模双色模模架。双色模具由均为1模2腔的塑件内衬基体注塑模具和包胶层注塑模具组成。模具采用热流道+冷流道相结合的方式进行浇注，解决了圆柱壁模腔充填困难问题，保证了流道废料的自动切除。模具共设计了36个结构相似、占用设计空间小的锁紧块T型槽驱动滑块机构来实施侧抽芯脱模，减少了模具整体结构尺寸。最后，通过一种插杆式机构来对模板的顺序开闭进行控制，机构动作可靠。

Design of Hot Runner Mould for Control-Knob Bi-color Injection Molding

A type of rotary bi-color hot runner mould was designed for production of the bi-color plastic parts of knob cover. In this mould, a four-plate with 3-time opening bi-color moldbase was adopted. The bi-color mould was composed of two sub-moulds, in which the first one was the injection sub-mould for the plastic lining matrix, the second one was the injection sub-mould for the plastic over layer, and the cavity layout of the two sub-molds was based on the one mold with two cavities. In the two sub-moulds, the combination of hot runner and cold runner was used for gating. In the first sub-mould, the three inner wall hidden gates were used for gating in the single cavity, and the three inner wall hidden gates were adopted for gating as well in the second sub-mould. The difficulty in filling the cylindrical wall mold cavity was overcome through this design scheme, and the automatic removal of runner waste was guaranteed. In this mould, 36 locking-block T-groove driving slider mechanisms with a similar structure and a small design space were designed to implement side core pulling demolding, which could reduce the overall size of the mould. These 36 mechanisms were driven by 3 times opening of the plates, and a type of inserting bar mechanism was designed to control the sequential opening and closing of the plates. This mechanism is reliable for operation.