轴套盖内环槽抽芯机构及注塑模具结构设计

Structure Design of Core-pulling Mechanisms and Injection Moulds for Axle Covers

结合某轴套盖塑件圆筒特征上内侧带带环形内槽、外侧带凸筋的结构特点,设计了能实现产品自动化注塑生产的4次分型、2次顶出的点浇口多板模具;针对环形内槽特征设计了六面体T形槽差速驱动的内环抽芯机构,并对机构运动的几何参数关系进行了机构运动建模分析,给出了具体的运动参数关系式;针对外环上凸筋构成的倒扣,采用了顶杆驱动、导向块T形槽导向的"肘形"斜顶机构。结果表明,模具结构设计合理,机构设计简单可靠。

This paper reported a structural design for point gate plate moulds with four times of mould parting and two times of ejection according to structure characteristics of the shaft sleeve cover cylinder plastic pieces with a ring groove on the inside and lateral convex ribs on the outside,which could realize the automatic injection-molding production.Furthermore,a differential driving inner core-pulling mechanism with an annular groove in the hexahedral T-shaped slot was designed according to the structure characteristics of ring grooves.The relationship between the geometric parameters of mechanism motion was modeled,and the equations for these movement parameters were given.For the convex rib composition on outer ring buckle,a 'toggle-type'inclined top mechanism with guide block oriented by T-shaped slots and driven by the push rod was designed.The results indicated that structure of the designed mould was reasonable and the design of the mechanism was simple and reliable.