Design of injection mould for PC lampshade of new energy vehicles
Based on the structural characteristics of a polycarbonate(PC)lampshade for a certain new energy vehicle,the mould adopted the cavity layout of"L+R"form with one mould and two cavities.Through CAE analysis of the product forming,the mould adopted two sets of needle valve hot runner structures.Based on the local concave features on the outer surface of the product,a compact demolding structure of"spring block+inclined guide pillar"was designed in the fixed mold,and the reliability of the spring block's operation was ensured through a mechanical hook mechanism.As the product is a transparent plastic part,the quality requirements for the inner surface of the product are also high.Due to the complex structure,the product has multiple instal-lation and positioning features,the dynamic mold adopted a linked core pulling structure of"inclined guide pillar+slider+forming block".In terms of the ejection system,the method of"square top rod+guide block+large top block"was adopted,successfully solving the problem of difficult product ejection.In terms of cooling system,independent waterways with a diameter of 8 mm were installed in each large projectile and top block,while the rest of the parts were designed as waterways with a diameter of 11.5 mm,the product was packaged in the middle to form a"conformal waterway".After the mould was put into production,each core pulling and ejection mechanism operated smoothly,and all product parameters met the requirements,proving that the design of each mecha-nism was reasonable,safe and effective.
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