一种新型高光注塑模具加热方法的模拟和实验研究
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摘要
采用电加热方式的高光注塑模具可以有效消除传统注塑成型过程中塑料件的熔接痕、浮纤、银纹等缺陷。然而直接将电加热棒插入模具孔中,由于间隙处的空气,大大降低了传热速度,提出一种新型电加热方法,通过在电加热棒与模具之间填充一种导热液,改变电加热棒与模具之间的接触状况,建立三维传热模型,并通过模拟和实验研究,证明了这种方法可以提高40%的加热效率,同时还能降低电加热棒内部40%的温度。
The defects-such as weld bond,floating fibre,sliver veins etc in traditional injection molding could be eliminated by rapid electric heating cycle injection molding technology. The gap between the mounting holes and heaters heavily effect the thermal response efficiency of this cavity surface. A new rapid mold heating method was developed for this problem. By using this method and filling a kind of liquid with good thermal conductive characters, the contacting condition between the mounting holes and heaters was changed. Both numerical simulations and experiments were performed to evaluate the thermal response efficiency of mold surface. The results show that thermal response effiency of mould surface compared with other conventional rapid mold heating methods could be improved by 40% through this method. At the same time,the temperature of the electric heating rod could be reduced by 40%.
The defects-such as weld bond,floating fibre,sliver veins etc in traditional injection molding could be eliminated by rapid electric heating cycle injection molding technology. The gap between the mounting holes and heaters heavily effect the thermal response efficiency of this cavity surface. A new rapid mold heating method was developed for this problem. By using this method and filling a kind of liquid with good thermal conductive characters, the contacting condition between the mounting holes and heaters was changed. Both numerical simulations and experiments were performed to evaluate the thermal response efficiency of mold surface. The results show that thermal response effiency of mould surface compared with other conventional rapid mold heating methods could be improved by 40% through this method. At the same time,the temperature of the electric heating rod could be reduced by 40%.
引文
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[3]张明磊,于昕世,王小新,等.蒸汽高光无熔痕成型技术研究与应用[J].模具技术,2009(3):27-29,53.Zhang Minglei,Yu Xinshi,Wang Xiaoxin,et al.Study and application of high-gloss&no-weldline steam injection molding technology[J].Die and Mould Technology,2009(3):27-29,53.
[4]Yao Donggang,Chen S C,Kim B H.Rapid thermal cycling of injection molds:an overview on technical approaches and applications[J].Advances in Polymer Technology,2008,27(4):233-255.
[5]Wang Xiaoxin,Zhao Guoqun,Wang Guilong.Research on the reduction of sink mark and warpage of the molded part in rapid heat cycle molding process[J].Materials&Design,2013,47:779-792.
[6]Wang Guilong,Zhao Guoqun,Li Huiping,et al.Research of thermal response simulation and mold structure optimization for rapid heat cycle molding processes,respectively,with steam heating and electric heating[J].Materials&Design,2010,31(1):382-395.
[7]刘斌,赵春振,吴明星.模具加热与温控方法剖析[J].模具工业,2009(5):1-6.Liu Bin,Zhao Chunzhen,Wu Mingxing.Analysis of heating and temperature control technique for injection mould[J].Die&Mould Industry,2009(5):1-6.
[8]Wang Guilong,Zhao Guoqun,Wang Xiaoxing.Development and evaluation of a new rapid mold heating and cooling method for rapid heat cycle molding[J].International Journal of Heat and Mass Transfer,2014,78:99-111.
[9]谢开旺.计算机热管理中的液体金属散热方法研究[D].中国科学院研究生院(理化技术研究所),2009.Xie Kaiwang.Study on the liquid metal cooling method for thermal management of computer[D].Technical Institute of Physics and Chemistry Chinese Academy of Sciences,2009.
[10]徐烈,杨军,徐佳梅,等.低温下固体表面接触热阻的研究[J].低温与超导,1996(1):53-58.Xu Lie,Yang Jun,Xu Jiamei,et al.The research of contact thermal resistance of solid surface at low temperature[J].Cryogenics&Superconductivity,1996(1):53-58.
[11]李志伟,徐烈,孙恒,等.低温真空下固体界面间接触热导实验分析[J].低温与超导,2004(1):55-58.Li Zhiwei,Xu Lie,Sun Heng,et al.Experimental research on thermal contact resistance under vacuum and low temperature[J].Cryogenics&Superconductivity,2004(1):55-58.
[12]毕冬梅,陈焕新,王丽萍,等.低温下接触界面热阻的实验与模拟研究[J].低温工程,2011(5):46-49,55.Bi Dongmei,Chen Huanxin,Wang Liping,et al.Simulation study on thermal boundary resistance between different metals at low temperature[J].Cryogenics&Superconductivity,2011(5):46-49,55.
[13]杨世铭,陶文铨.传热学[M].第4版.北京:高等教育出版社,2006.Yang Shiming,Tao Wenquan.Heat transfer theory[M].The fourth version.Beijing:Higher Education Press,2006.