Moldflow software was used to deeply analyze and optimize the mold flow process of the inner panel of the auto-motive drawer.According to the detailed results of the simulation analysis and the unique structural characteristics of the plastic parts,a one-point open hot runner gating system was designed,and the problems that might be encountered in the injection molding process of the plastic parts were predicted.Finally,a hot runner injection mould with one mould and one cavity was designed.In order to overcome the demoulding problem caused by excessive clamping force on the slider due to the reinforcement position of the plastic part after injection molding,a composite core pulling mechanism with a built-in ejector pin in the slider was designed.This mechanism integrated multiple components of"slider+ejector pin+spring+sliding block".By implementing a two-step core pulling strategy,it effectively prevented the plastic part from being stuck by the slider.The guidance positioning system achieved precise and reliable reset function of the mould during the opening and closing process by using the strategy of"guide pillar guide sleeve+fixed mould positioning".In order to efficiently drive and reset the ejection mechanism,a combination of"top roller+gas spring"was adopted,which reduced the ejection reset time by about 25%compared to using hydraulic cylinders.A cooling system that approximates a"conformal waterway"was designed,forming a three-dimensional and dense grid-like cooling network that enhances the cooling effect and shortens the molding cycle by about 8%.After the mould is put into production,its operation perfor-mance is stable and reliable,and the quality of the produced plastic parts fully meets the established standards.This provides a refer-ence for the design of moulds for similar structural plastic parts.
automotive drawer inner panelsliding block with built-in ejector pinmold flow analysishot runner system
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