基于最小功率损失的嵌件塑件注塑成形合模间隙分布

Injection mold clearance variety with embedded parts based on the method of minimum power loss

针对带有嵌件的塑件在注射成形时动模和定模合模间隙不易确定的问题,引入了最小功率损失理论获得该间隙的分布。首先,根据嵌件塑件的结构特点,提出熔体在窄隙长流道中的流动简化条件;利用流体力学中型腔面积突变时阻力系数变化理论,分析了嵌件塑料件成形时嵌件部位料流流动状况;利用最小功率损失理论获得嵌件塑件注塑成形合模间隙随浇注点位置的变化分布曲线。结果表明,该设计方法可以有效控制嵌件塑件注塑时缺陷的位置,生产出合格的嵌件塑料件。

In order to solve the difficulties in determining the injection mold clearance when the plastic with embedded parts is processed by injection molding, the rule of injection mold clearance is put forward for obtaining the clearance vareity. First, the assumption conditions are given according to the structure features of the plastic with embedded parts streaming in the narrow and long runner. The local streaming conditions with embedded parts are analyzed according to the drag index varying theory when the contour section area varies suddenly. The minimum power loss theory is used for obtaining the variety curve description of the clearance and the distance away from the injection gate. The results show that this method can control the injection defects of the plastic with embedded parts effectively and produce regular production.