【摘要】 结合大型尺寸塑件发动机进气歧管批量生产需要，选用玻璃纤维增强聚酰胺专用塑料对其进行注射成型，材料中加纤质量分数为33%。模具使用一模一腔布局，模腔使用2个针阀式浇口进行浇注，相应的注塑工艺参数为模温70℃、注射压力100 MPa、充填时间5.5 s、保压压力50 MPa、保压时间11 s。针对塑件结构复杂、脱模困难问题，运用脱模方向集成设计方法设计了5个特殊脱模机构用于塑件的脱模；其中定模一侧布置3个联动式油缸驱动滑块斜抽芯机构，将斜向抽芯转化为水平侧抽芯，能有效减少斜抽芯机构件对模具厚度尺寸的要求；动模一侧布置的1个水平侧抽芯滑块机构和1个弯管抽芯机构，结合塑件弯管内壁的脱模采用分段抽芯脱模法进行设计，有效解决了塑件弯管内壁既有直线段又有弯管段而难以设计脱模机构的难题，保证了塑件自动化注塑生产的实现。结合弯管抽芯机构的动作需要，两板热流道模模架的开模由单次开模改进为两次开模，第二次开模使用油缸驱动动模板顶出而实现。塑件的顶出脱模借助两种油缸分两次实施顶出而实现。模具整体结构设计、机构配置合理，有较好的设计参考意义。更多还原

【Abstract】 Considering the mass production needs of large-sized plastic part of engine intake-manifold,glass fiber modified and reinforced polyamide specialized plastic was selected for injection molding,with a fiber content of 33% added to the material.The layout of mould cavity was one mould with one cavity,and two needle valve gates were used for gating. The corresponding injection process parameters were mold temperature 70 ℃,injection pressure 100 MPa,filling time 5.5 s,holding pressure 50 MPa,and holding time 11 s. Aiming to the difficulty of demolding complex plastic structures,five special demolding mechanisms were designed by using the integrated demolding direction design method for demolding plastic parts. Three linked hydraulic cylinder driven slider angle core pulling mechanisms were arranged on the side of the fixed mold,which converted the angle core pulling into horizontal core pulling,effectively reducing the requirements of the angle core pulling mechanism on the thickness size of the mould. One horizontal side core pulling slider mechanism and one bent pipe core pulling mechanism were arranged on the side of the moving mould,design in combination with the segmented core pulling demolding method for demolding the inner wall of the plastic bent pipe was carried out. This effectively solved the problem of difficult demolding mechanism design due to the presence of both straight and curved sections on the inner wall of the plastic bent pipe,ensuring the realization of automated injection molding production of plastic parts. Based on the needs of the bending core pulling mechanism,the opening of the two plate hot runner moldbase had been improved from single opening to two opening,and the second opening was achieved by using an hydraulic cylinder to drive the moving plate. The ejection and demolding of plastic parts were achieved by using two types of hydraulic cylinders to perform ejection in two stages. The overall structure of the mold is set reasonably,and the mechanism configuration is reasonable,which has good design reference significance.更多还原