Comparison and Analysis on Cavity Pressure of Conventional Injection Molding and Injection Compression Molding
WANG Tao1,2, GE Yong1,2, LANG Jian-lin1,2, SUN Qi-wei1,2, LI Lei1,2, YAN Yue1,2
1. AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. Beijing Engineering Research Center of Advanced Structural Transparence for the Modern Traffic System, Beijing 100095, China
Abstract:The cavity pressure sensors were mounted in the self-developed injection compression mold. Comparison and analysis on cavity pressure of conventional injection molding and injection compression molding were conducted by changing process parameters. The results show that injection compression molding can greatly decrease the injection pressure and cavity pressure, and make the cavity pressure field more uniform. During the conventional injection molding,the influence of mold temperature on the cavity pressure is the most significant factor, followed by melt temperature, pressure holding time and holding pressure. During the injection compression molding, the compression speed influences the most, followed by melt temperature, mold temperature and compression stroke. The technological advantages and pressure field characteristic of injection compression molding were further validated with the low residual stress and small warpage, indicating the cavity pressure plays a major role in guiding processing properties.
王韬, 葛勇, 郎建林, 孙琦伟, 厉蕾, 颜悦. 注射压缩成型与常规注射成型的模腔压力对比分析[J]. 材料工程, 2018, 46(4): 127-133.
WANG Tao, GE Yong, LANG Jian-lin, SUN Qi-wei, LI Lei, YAN Yue. Comparison and Analysis on Cavity Pressure of Conventional Injection Molding and Injection Compression Molding. Journal of Materials Engineering, 2018, 46(4): 127-133.
[1] CHEN S C, CHEN Y C, CHENG N T, et al. Simulation of injection-compression mold-filling process[J]. International Communications in Heat and Mass Transfer, 1998, 25(6):907-917.
[2] MARTIN F A, CANTON N. Combined injection and compression molding:US2938232[P]. 1957-06-21.
[3] SPECTOR D P, KINGSBURY J M. Fabrication of thermoplastic optical components by injection/compression molding:US4836960[P]. 1987-10-05.
[4] YANG S Y, KE M Z. Influence of processing on quality of injection-compression-molded disks[J]. Polymer Engineering & Science, 1995, 35(15):1206-1212.
[5] YANG S Y, CHEN Y C. Experimental study of injection-charged compression molding of thermoplastics[J]. Advances in Polymer Technology, 1998, 17(4):353-360.
[6] GUAN W S, HUANG H X. Back melt flow in injection-compression molding:effect on part thickness distribution[J]. International Communications in Heat and Mass Transfer, 2012, 39:792-797.
[7] 葛勇, 王韬, 郎建林, 等. 注射压缩成型工艺参数对厚壁聚碳酸酯制件厚度的影响[J]. 高分子材料科学与工程, 2015, 31(4):117-120. GE Y, WANG T, LANG J L, et al. Effects of injection compression molding parameters on thickness of thick polycarbonate parts[J]. Polymer Materials Science & Engineering, 2015, 31(4):117-120.
[8] MICHAELI W, WIELPUETZ M. Optimization of the optical part quality of polymer glasses in the injection compression moulding process[J]. Macromolecular Materials and Engineering, 2000, 284/285:8-13.
[9] 周明勇, 蒋炳炎, 鲁立君, 等. 聚合物纳米/亚微米结构零件注射成型的研究进展[J]. 材料工程, 2014(4):95-100. ZHOU M Y, JIANG B Y, LU L J, et al. Progress in research on polymer nano/sub-micro structure by injection molding[J]. Journal of Materials Engineering, 2014(4):95-100.
[10] 陈宇宏, 袁源, 刘小艳, 等. 注射成型和注射压缩成型透明件的光学性能对比与分析[J]. 航空材料学报, 2011, 31(2):55-60. CHEN Y H, YUAN Y, LIU X Y, et al. Comparison on optical properties of injection molded and injection compression molded transparencies[J]. Journal of Aeronautical Materials, 2011, 31(2):55-60.
[11] WANG T, YAN Y, LI L. Numerical simulations and experiments on the injection molding of aircraft transparencies[C]//29th Congress of the International Council of the Aeronautical Sciences, St Petersburg, Russia:ICAS, 2014.
[12] KURT M, KAMBER O S, KAYNAK Y, et al. Experimental investigation of plastic injection molding:assessment of the effects of cavity pressure and mold temperature on the quality of the final products[J]. Materials and Design, 2009, 30:3217-3224.
[13] WU H W, ZHANG S D, QU J P, et al. Measurement and analysis of cavity pressure and melt filling capacity during injection molding[J]. Polymer-Plastics Technology and Engineering, 2007, 46:123-127.
[14] HASSAN H. An experimental work on the effects of injection molding parameters on the cavity pressure and product weight[J]. The International Journal of Advanced Manufacturing Technology, 2013, 67(1):675-686.
[15] GUAN W S, HUANG H X. A proposed technique to acquire cavity pressure using a surface strain sensor during injection-compression molding[J]. Journal of Manufacturing Science and Engineering, 2013, 135:021003.
[16] 曹伟, 张世勋, 王韬, 等. 聚碳酸酯熔体压缩过程流变特征及型腔压力演化规律[J], 精密成形工程, 2016(1):32-36. CAO W, ZHANG S X, WANG T, et al. Polycarbonate melt rheological characteristics and evolutionary regularity of cavity pressure in compression process[J]. Journal of Netshape Forming Engineering, 2016(1):32-36.
[17] 王韬, 曹伟, 颜悦, 等. 聚碳酸酯熔体挤压流变研究[J]. 材料工程, 2013(5):73-77. WANG T, CAO W, YAN Y, et al. Rheological behavior of polycarbonate melt under squeeze flow[J]. Journal of Materials Engineering, 2013(5):73-77.
[18] LEE H S, YOO Y G. Effects of processing conditions on cavity pressure during injection-compression molding[J]. International Journal of Precision Engineering and Manufacturing, 2012, 13(12):2155-2161.