投影仪镜筒双斜度八斜顶脱模机构注塑模设计  

Design of Injection Mold with Double Angles and Eight Lifters Demoulding Mechanism for Projector Lens Barrel

作　　者：华丽霞[1] Hua Lixia(Yiwu Industrial&Commercial College,Yiwu 322000,China)

机构地区：[1]义乌工商职业技术学院,浙江义乌322000

出　　处：《工程塑料应用》2021年第12期91-95,共5页Engineering Plastics Application

基　　金：浙江省教学改革项目(JG20180721);浙江省2019-2020年度产教融合“五个一批”协同育人项目(208)。

摘　　要：结合投影仪镜筒塑件的成型要求,设计了一副注射成型模具,模具结构为三板模结构,1模1腔布局。模腔使用6个点浇口进行平衡浇注,以减小塑件收缩变形。模腔由多个镶件组合构成,镶件的使用降低了成型件加工难度并保证成型件的成型尺寸精度。针对塑件内壁上有螺旋槽难以脱模的问题,设计了一种有两种顶出斜度的双斜度八斜顶脱模机构用于内壁的脱模;该脱模机构中,共设有两组8个斜顶及一个中央导向机构件;第1组4个斜顶采用2.5°斜度顶出,第2组4个斜顶采用11.5°斜度顶出;两组斜顶同步顶出实施侧抽芯时,8个斜顶两两之间产生相同大小的间隙,从而能保证8个斜顶的无阻碍顶出,实现了塑件内壁的自动化脱模。Combination with the molding requirements of the projector lens barrel plastic parts,an injection mold was designed.The mold structure was a three-plate mold structure with an one-mold with one-cavity layout.The mold cavity used a six point gates for balanced gating to reduce shrinkage and deformation of the plastic part.The mold cavity was composed of a combination of multiple inserts,and the use of inserts reduced the processing difficulty of the molded part and ensure the molding dimensional accuracy of the molded part.In view of the difficulty of demoulding with spiral grooves on the inner wall of the plastic part,a combined double angles and eight lifters demoulding mechanism with two ejection angles was designed for demoulding the inner wall.In the mechanism,there were two groups of eight lifters and a central guide mechanism.The first group of four lifters were ejected at an angle of 2.5°with the opening mold direction,and the second group of four lifters were ejected at an angle of 11.5°with the opening mold direction.When the two groups of lifters were simultaneously ejected to implement side core pulling,the same size gap was generated between two of eight lifters,thereby which ensured the unobstructed ejection of eight lifters,and realized the automatic demoulding of the inner wall of the plastic part.

关 键 词：投影仪镜筒 螺旋槽 双斜度顶出 三板模 注射成型 

分 类 号：TQ320.52[化学工程—合成树脂塑料工业]