工艺因素对RHCM成型制品收缩的宏观影响  

Research on the effects of process parameters on shrinkage variation of the rapid heat cycle molding plastic part

作　　者：曹文华[1] 辛勇[1] 刘东雷[1,2] 

机构地区：[1]南昌大学机电工程学院,南昌330031 [2]郑州大学国家橡塑模具工程研究中心,郑州450002

出　　处：《材料科学与工艺》2013年第3期80-86,共7页Materials Science and Technology

基　　金：江西省自然科学基金资助项目(20122BBE500044);国家自然科学基金资助项目(11172271)

摘　　要：开发了车载高光蓝牙快速热响应实验模具和动态模温控制系统,基于单因子实验和Taguchi理论,以无定形ABS塑料为实验材料,研究了模具温度对高光注塑成型(Rapid Heat Cycle Molding,RHCM)制品收缩的影响规律。结果表明:适当升高模具温度可以有效降低制品收缩,最佳模温应控制在塑料热变形温度附近;在高模温作用下,熔体温度(低于210℃)和注射压力(低于100 MPa)较低时,制品收缩性态较为复杂,当二者高于该临界值之后则趋于稳定减小或大体不变状态;保压压力、保压时间和冷却时间的影响呈"V"型小幅波动,且均在塑料热变形温度附近达极小值;模温设定条件下,保压压力对制品收缩影响最大,其次是保压时间,冷却时间影响最小,熔体温度和注射压力的影响效应相当.A rapid heat response mold for producing a vehicle-used blue-tooth front shell and a dynamic mold temperature control auxiliary system was proposed and designed.Coupled with the single factor experimental method and Taguchi method of signal-to-noise theory,the effect of processing conditions including mold temperature,melt temperature,injection pressure,packing pressure,packing time and cooling time on wrapage defect of acrylonitrile butadiene styrene（ABS） has been investigated.Results indicate that the elevated mold temperature reduces the shrinkage of part,whereas overheating leads to defective product.The efficient mould temperature scope in RHCM should be around the glass transition temperature of polymer material.Under the same mold temperature conditions,packing time is the most significant parameter followed by packing pressure,while the cooling time has little significant to the shrinkage.

关 键 词：高光注射成型 工艺参数 塑料制品 成型收缩 宏观影响 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]