薄壁深腔侧抽芯盆形塑件热流道注塑模具设计OA

Based on the injection-molding characteristics of thin-walled deep-cavity parts,a hot runner gating system for high-pressure and high-speed filling was adopted.The high injection pressure exerts a strong impact force on the cavity plates,which are prone to deflection.Therefore,support pillars were installed between the bottom plate and the moving-mold plate to increase mold rigidity.To solve the difficult venting problem,a stepped venting system is proposed.Replaceable venting inserts are added to conventional vent slots to prevent short shots and burn marks.Because the core-cavity contact surfaces are inclined,balance-block supports and parting-line locks are placed between the moving and fixed plates to counteract the unbalanced forces caused by injection pressure and to improve plate-positioning accuracy.The mold uses the machine ejector rods to act directly on the stripper plate for ejection and return,reducing mold thickness and production cost.According to the structures of the moving mold,fixed mold and slides,a zoned temperature-control cooling network was laid out.Cooling channels were placed at the gate,in the fixed half,moving half,cores and slides,using a combination of straight-through and baffle cooling to achieve full cooling,shorten cycle time and obtain good surface quality.Production practice shows that the design is practical and valuable.