180°UPVC塑料弯管旋转抽芯注塑模设计  

Design of Injection Mould for 180°UPVC Plastic Bend with Rotating Core Pulling

作　　者：孙友 Sun You(Tianjin University of Technology and Education,School of Mechanical Engineering,Tianjin 300222,China;Tianjin Vocational College of Mechanics and Electricity,School of Mechanical,Tianjin 300350,China)

机构地区：[1]天津职业技术师范大学机械工程学院,天津300222 [2]天津机电职业技术学院机械学院,天津300350

出　　处：《工程塑料应用》2023年第12期106-111,共6页Engineering Plastics Application

基　　金：2022年天津研究生重点科研创新项目(2022BKY208)。

摘　　要：针对某弯管塑件上180°弯管内壁脱模困难的问题进行了脱模机构和模具结构方面的优化设计,设计了一副带旋转抽芯机构的两板注塑模具用于该塑件的注射成型。针对硬质聚氯乙烯塑件180°弯管内壁的脱模要求,设计了一种180°弯管旋转抽芯机构,机构先利用模具开模的旋转机构使塑件与型腔镶件脱离,并去除弯管型芯抽出的阻挡部分,然后使用顶出油缸推动推板将180°弯管型芯及其上面的塑件从型芯镶件上一起顶出,最后在挡板的辅助阻挡作用下,再由油缸驱动将180°弯管型芯从塑件中抽出,使塑件从弯管型芯上自动掉落从而实现塑件的自动脱模。为保证塑件的注射成型质量,型芯和型腔主要组成零件的材料选用不锈钢440C,并设计了塑件的注射成型工艺,成型工艺的主要参数为喷嘴温度为192℃、注塑压力为140 MPa、保压压力为40 MPa、背压为3 MPa、模具温度为30~45℃。Focused on the optimization and innovative design of the demoulding mechanism and structure of mould for the difficulty of demoulding the inner wall of a 180°bend pipe on a plastic part of a certain bend pipe,a two-plate injection mould with a rotating core pulling mechanism was designed for the injection moulding of the plastic part.A 180°bend rotating core pulling mechanism was designed for the demoulding of the inner wall of the 180°bend of plastic parts made from unplasticized polyvinyl chloride.The mechanism first used the mould opening action to separate the plastic parts from the cavity insert,and removed the blocking part of the bend core pulling out.Then,the ejector cylinder was used to push the push plate to push the 180°bend core and its upper plastic parts out of the core insert.Finally,under the auxiliary blocking of the baffle,the 180°bend core was driven by the oil cylinder to be pulled out of the plastic parts,Automatically drop the plastic part from the bent core to achieve automatic demoulding of the plastic part.Correspondingly,to ensure the injection moulding quality of the plastic parts,stainless steel 440C was selected as the main component material of the mould cavity,and the injection moulding process of the plastic parts was designed.The main parameters of the process are as follows:nozzle temperature is 192℃,injection pressure is 140 MPa,holding pressure is 40 MPa,back pressure is 3 MPa,and mould temperature is 30-45℃.

关 键 词：硬质聚氯乙烯 180°弯管 注射成型 模具结构 弯管抽芯 机构设计 

分 类 号：TG243[金属学及工艺—铸造]