压缩工艺参数对注射压缩成型聚碳酸酯透明件残余应力的影响  

Effect of compression process parameters on residual stress of injection-compression-molded polycarbonate transparencies

作　　者：陈宇宏 詹茂盛[2] CHEN Yuhong;ZHAN Maosheng(Institute of Transparency,Beijing Institute of Aeronautical Materials,Beijing 100095,China;School of Material Science and Engineering,Beihang University,Beijing 100083,China)

机构地区：[1]中国航发北京航空材料研究院透明件研究所,北京100095 [2]北京航空航天大学材料科学与工程学院,北京100083

出　　处：《中国塑料》2021年第12期9-15,共7页China Plastics

摘　　要：基于注射压缩成型技术,以聚碳酸酯为原材料,采用不同的压缩工艺参数制备出聚碳酸酯透明件。结合成型过程中的模具型腔压力测试,采用定性(应力偏光法)和定量(小孔法)两种方法,对成型透明件的残余应力进行了测试,分析了压缩启动位置、压缩距离、熔体温度及模具温度等压缩过程的核心工艺参数对聚碳酸酯透明件残余应力的影响规律。结果表明,随着压缩启动位置的推迟或压缩距离的增大,型腔压力上升,使得制品的残余应力降低,当压缩启动位置从10%延迟至70%时,或者压缩距离从0.5 mm增大至2.0 mm,透明件测试点的Von Mises等效残余应力平均下降幅度达到82.0%和64.7%;随着熔体温度的升高或模具温度的升高,型腔压力变化并不明显,但制品的残余应力降低,当熔体温度从290℃升至320℃,或者模具温度从80℃升至120℃,透明件测试点的Von Mises等效残余应力平均下降幅度达到56.2%和77.0%。Transparencies were injection-compression-molded under different compression conditions using polycarbonate(PC)as a raw material.Through combining the mold cavity pressure test during the molding process,the effect of the core compression process parameters on the residual stress of the PC transparencies such as compression start position,compression distance,melt temperature and mold temperature were investigated using two methods,qualitative(stress polarization method)and quantitative(hole drilling strain gage method).The results indicated that the cavity pressure increased as the compression start position was delayed or the compression distance increased.This resulted in a decrease in both flow residual stress and thermal residual stress and a decrease in the residual stress of the product.When the compression start position was delayed from 10% to 70%,or the compression distance increased from 0.5 mm to 2.0 mm,the Von Mises equivalent residual stress at the test point of the transparent parts obtained an average decrease by 82.0% and 64.7%,respectively.With an increase in melt temperature or mold temperature,there is no significant change in cavity pressure.However,a decrease in thermal residual stress resulted in a decrease in the residual stress of the PC transparencies.When the melt temperature rose from 290℃ to 320℃,or the mold temperature rose from 80℃ to 120℃,the Von Mises equivalent residual stress at the test point of the transparencies decreased by an average of 56.2% and 77.0%,respectively.

关 键 词：注射压缩成型 聚碳酸酯 残余应力 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]