电视机外壳大型注射模设计

Design of Large Injection Mould for TV Shell

结合电视机主壳塑件的结构特点,设计了一副两板模具用于其注射成型。模腔的浇注采用7点牛角浇口进行浇注,并且,采用冷热流道相结合的流道进行供料。为有利于加工、降低模具制造成本及模具后期维护,模具结构进行了以下优化改进,成型件采用主镶件+功能镶件拼合形式组合镶件;导柱采用可拆卸式导柱;模架采用定位管销组件定位;边锁采用耐磨片更换式结构;斜顶机构的斜顶座采用滑块结构式;复位杆、流道顶杆、推块推杆等采用延时机构件;推管采用3种芯杆固定式推管;滑块机构采用延时二次抽芯滑块,防止在塑件脱模时损坏;模具定、动模均采用定位圈,有利于大模具安装。改进后的模具结构动作更为可靠、加工方便、成本较低,并且有利于模具后期维护。

Combining the structural characteristics of the plastic parts of the TV main shell,a two-plate mold was designed for its injection molding.The gating of the mold cavity used a 7-point horn gate for gating,and the runner that combined hot and cold runners for feeding.In order to facilitate processing,reduce mold manufacturing costs and later maintenance of the mold,the mold structure had been optimized and improved as follows:The molded part adopt the main insert+functional insert combined form;The guide post mechanism used a detachable structure;The mold base used positioning pipe pin and positioning screw to fasten the combination;The side-lock used a wear-resistant sheet replacement structure;The lifter mechanisms used sliding block structure;Reset rod,runner-rod,push-rod,etc.used extension timedelay mechanism parts;Push-tube used 3 kinds of core-rod-fixed structure'push-tubes;Slider mechanism used delayed secondary-core-pulling slider to prevent plastic parts from being damaged in demoulding;Fixed-mold and moving-mold used positioning-rings for convenience large mold installation.The improved mold structure was more reliable in action,convenient to process,lower in cost,and more convenient for maintenance of the mold.