A set of four-cavity mould was designed to cater to the compact structure and the large distribution of 1 mm raised text on the surface of the plastic parts for the craft badge.In order to ensure the appearance quality of the parts,three factors that affect the appearance quality were given priority:The dimensions of gate scars,complete filling without short shots,and uniform volume shrinkage without sink marks.Firstly,combined with Moldflow software simulation,a 0.6 mm diameter pinpoint gate was determined,and then the volume shrinkage rate and incomplete filling phenomenon were optimized through adjustments of process parameters.Secondly,the mould structure was designed,including parting surfaces,fixed mould cores,movable mould cavities,gate injection systems,and demolding mechanism.Due to the compact structure of the badge plastic parts,it was finally decided to use two 5 mm diameter and six 3 mm diameter ejector pins to achieve demolding of the product.Finally,through actual production verification,all four cavities were uniformly and completely filled,and the appearance quality of the plastic parts was good.Moldflow molding analysis significantly improved the design efficiency of injection mould and the quality of plastic part molding.
维普
万方数据