薄壁注射成型中聚合物与模具间接触热阻研究  

Research on thermal contact resistance between polymer and mold during thin-wall injection molding

作　　者：蒋礼[1] 蒋炳炎[1] 吴旺青[1] 朱来余 DRUMMER Dietmar JIANG Li1,JIANG Bingyan1,WU Wangqing1,ZHU Laiyu1,DRUMMER Dietmar2(1. State Key Laboratory of High-Performance Complex Manufacturing,Central South University,Changsha 410083,China; 2. Institute of Polymer Technology,University of Erlangen-Nürnberg,Erlangen 91058,German)

机构地区：[1]中南大学高性能复杂制造国家重点实验室,湖南长沙410083 [2]埃尔朗根-纽伦堡大学聚合物技术研究所,德国埃尔朗根91058

出　　处：《中南大学学报（自然科学版）》2018年第6期1381-1386,共6页Journal of Central South University:Science and Technology

基　　金：国家重点基础研究发展计划("973"计划)项目(2012CB025905);国家自然科学基金面上项目(51575540)~~

摘　　要：基于薄壁注射成型过程中聚合物熔体与模具之间的热量交换分析,提出一种可用于计算聚合物与模具界面之间接触热阻(RTC)的新算法,通过结合实验研究与理论分析,获得聚碳酸酯(PC)薄壁制件注射成型中聚合物与模具界面之间的平均RTC,研究注射成型工艺参数以及聚合物与模具之间界面环境对RTC的影响规律。研究结果表明:薄壁注射成型中聚合物与模具界面之间的RTC与成型条件密切相关,其影响不可忽略;RTC随着模具温度、熔体温度、保压压力和保压时间的增加而减小,其中模具温度和保压时间的影响最显著;通过更换导热率较高或者型腔表面粗糙度较高的模芯材料,同样可降低RTC。Based on the heat exchange analysis between polymer and mold during thin-wall injection molding, a novel algorithm for calculating thermal contact resistance（RTC） between polymer and mold was proposed. Through combination of experimental and analytical research, the average RTC between polymer and mold during injection molding for a polycarbonate（PC） thin-wall part was obtained, and the influence of the injection molding process parameters and the interface environment between melt and mold on RTC was researched. The results show that RTC between polymer and mold in thin-wall injection molding is not negligible, and it is strongly correlated with the process conditions. RTCdecreases with the increase of the melt temperature, mold temperature, dwell pressure and dwell time, and the mold temperature and dwell time have the greatest influence on RTC. Exchanging with higher thermal conductive or higher surface roughness mold core can also reduce RTC.

关 键 词：薄壁注塑 接触热阻 界面传热 成型条件 

分 类 号：TQ320.63[化学工程—合成树脂塑料工业]