短玻纤聚丙烯水辅注塑中注水压力控制方式的数值模拟
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摘要
基于广义非牛顿本构方程,采用有限体积法对不同注水压力控制方式下短玻纤聚丙烯水辅注射成型进行数值模拟。研究表明,注水压力控制方式的改变,会对水辅注塑制件的残余壁厚、偏心率产生一定的影响;使用折线式的控制方式,不同分组之间残余壁厚大小相近,偏心率均较大,同一分组下残余壁厚的变化较小;使用阶跃式的控制方式,不同分组下残余壁厚大小都不相近,且偏心率较小,同一分组下残余壁厚的变化较大。
Based on the generalized non-Newton constitutive equation, a finite volume method was used to simulate the water-assisted injection molding of short-glass-fiber-reinforced polypropylene(PP) under the different water injection pressure control modes. The simulation results indicated that the change of water injection pressure control mode had a certain influence on the residual wall thickness and eccentricity rate of the water-assisted injection molded parts. The residual wall thickness between different groups was similar and the eccentricity rate was larger when using the polyline control mode. The residual wall thickness also became more uniform in the same group. Using the stepwise control method, the residual wall thickness was not similar under different groups, and the eccentricity rate was small. The residual wall thickness also changed significantly under the same group.
Based on the generalized non-Newton constitutive equation, a finite volume method was used to simulate the water-assisted injection molding of short-glass-fiber-reinforced polypropylene(PP) under the different water injection pressure control modes. The simulation results indicated that the change of water injection pressure control mode had a certain influence on the residual wall thickness and eccentricity rate of the water-assisted injection molded parts. The residual wall thickness between different groups was similar and the eccentricity rate was larger when using the polyline control mode. The residual wall thickness also became more uniform in the same group. Using the stepwise control method, the residual wall thickness was not similar under different groups, and the eccentricity rate was small. The residual wall thickness also changed significantly under the same group.
引文
[1] KNIGHTS M. Water Injection Molding Makes Hollow Parts Faster, Lighter[J]. Plastics Technology, 2002, 48(4):42-47.
[2] SANNEN S, PUYVELDE P, KEYZER J. Defect Occurrence in Water-Assisted Injection-Molded Products: Definition and Responsible Formation Mechanisms[J]. Advances in Polymer Technology, 2015, 34(1):701-708.
[3] 陈英龙, 周华, 张增猛,等. 水辅与气辅成型残余壁厚的对比研究[J]. 中国塑料, 2012, 26(6):71-75. CHEN Y L, ZHOU H, ZHANG Z, et al. Comparison Research on Residual Wall Thickness of Water-assisted and Gas-assisted Injection Molded Parts[J]. China Plastics, 2012, 26(6):71-75.
[4] Oliveira D, Mateus A, Carreira P, et al. Water Assisted Injection Molding for Single and Multi-branched Tubular Components[J]. Procedia Manufacturing,2017,12:141-149.
[5] KUANG T, YU C, XU B, et al. Experimental Study of Penetration Interfaces in the Overflow Fluid-assisted Co-injection Molding Process[J]. Journal of Polymer Engineering, 2016, 36(2):139-148.
[6] 张伟,柳和生,余忠,等.水辅助注射成型制品质量的缺陷及工艺优化研究概述[J].中国塑料,2018, 32(4):12-17. ZHANG W, LIU H S, YU Z, et al. A Survey of Defects and Process Optimization of Water-assisted Injection Molding Parts[J].China Plastics,2018, 32(4):12-17.
[7] YANG J G, ZHOU X H, NIU Q. Model and Simulation of Water Penetration in Water-assisted Injection Molding[J]. International Journal of Advanced Manufacturing Technology, 2013, 67(1/4):367-375.
[8] Knights M. Water injection: It ’s all Coming Together[J]. Plastics Technology, 2005, 51(9):54-61.
[9] 熊爱华,柳和生,黄兴元.新型注射成型技术——水辅助注射成型[J].塑料, 2009, 38(5):41-44. XIONG A H, LIU H S, HUANG X Y.New Injection Molding Technology-Water-Assisted Injection Molding[J]. Plastics,2009, 38(5):41-44.
[10] 汪志泳,黄汉雄,汪斌.水辅助注塑中高压水穿透过程的数值模拟[J].化工学报, 2013, 64,(4):43-48. WANG Z Y, HUANG H X, WANG B. Numerical Simulation of Water Penetration in Water-Assisted Injection Molding[J]. CIESC Journal, 2013, 64(4):43-48.
[11] 章凯,匡唐清,柳和生.注水压力对圆管件水辅注塑填充过程的影响[J].高分子材料科学与工程, 2016, 32(6):113-117. ZHANG K, KUANG T Q, LIU H S, et al. Influence of Water Injection Pressure on Water-Assisted Injection Molding Filling Process[J]. Polymer Materials Science and Engineering, 2016, 32(6):113-117.
[12] 匡唐清,邓洋,余春丛.溢流法水辅注塑中注水参数对水穿透的影响分析[J].中国塑料, 2014, 28(7):102-105. KUANG T Q, DENG Y, YU C C.Experimental Investigation of the Effects of Water Parameters on Water Penetration During Overflow Water-Assisted Injection Mol-ding Process[J]. China Plastics, 2014,28(7):102-105.
[13] YANG J G, ZHOU X H, LUO G P. Study of Water Penetration Length and Processing Parameters Optimization in Water-assisted Injection Molding[J]. International Journal of Advanced Manufacturing Technology, 2013, 69(9/12):2 605-2 612.
[14] HUANG H X, ZHOU R H, YANG C. Fiber Orientation Propelled by High-pressure Water Penetration in Water-assisted Injection Molded Fiber-reinforced Thermoplastics Part[J]. Journal of Composite Materials, 2013, 47(2):183-190.
[15] 匡唐清,邓洋.注水参数对水辅助注射成型充填过程影响的数值模拟[J].中国塑料, 2014, 28(2):102-106. KUANG T Q, DENG Y. Numerical Simulation of Effect of Water Injection Parameters on Water-Assisted Injection Molding Filling Process[J]. China Plastics, 2014, 28(2):102-106.
[16] PROTTE R, BANGERT H, COOPER C,et al. Water-assist Injection Molding-an Innovative Process Technology for Productivity Improvement: Developments in Processing, Equipment and Materials[C]//Proceedings of the 61st Annual Technical Conference of SPE, Nashville. Brookfield: SPE/ANTEC, 2003:404-408.
[17] 张增猛.水辅成型充模流动的纯水液压比例压力控制[D].杭州:浙江大学, 2009.
[2] SANNEN S, PUYVELDE P, KEYZER J. Defect Occurrence in Water-Assisted Injection-Molded Products: Definition and Responsible Formation Mechanisms[J]. Advances in Polymer Technology, 2015, 34(1):701-708.
[3] 陈英龙, 周华, 张增猛,等. 水辅与气辅成型残余壁厚的对比研究[J]. 中国塑料, 2012, 26(6):71-75. CHEN Y L, ZHOU H, ZHANG Z, et al. Comparison Research on Residual Wall Thickness of Water-assisted and Gas-assisted Injection Molded Parts[J]. China Plastics, 2012, 26(6):71-75.
[4] Oliveira D, Mateus A, Carreira P, et al. Water Assisted Injection Molding for Single and Multi-branched Tubular Components[J]. Procedia Manufacturing,2017,12:141-149.
[5] KUANG T, YU C, XU B, et al. Experimental Study of Penetration Interfaces in the Overflow Fluid-assisted Co-injection Molding Process[J]. Journal of Polymer Engineering, 2016, 36(2):139-148.
[6] 张伟,柳和生,余忠,等.水辅助注射成型制品质量的缺陷及工艺优化研究概述[J].中国塑料,2018, 32(4):12-17. ZHANG W, LIU H S, YU Z, et al. A Survey of Defects and Process Optimization of Water-assisted Injection Molding Parts[J].China Plastics,2018, 32(4):12-17.
[7] YANG J G, ZHOU X H, NIU Q. Model and Simulation of Water Penetration in Water-assisted Injection Molding[J]. International Journal of Advanced Manufacturing Technology, 2013, 67(1/4):367-375.
[8] Knights M. Water injection: It ’s all Coming Together[J]. Plastics Technology, 2005, 51(9):54-61.
[9] 熊爱华,柳和生,黄兴元.新型注射成型技术——水辅助注射成型[J].塑料, 2009, 38(5):41-44. XIONG A H, LIU H S, HUANG X Y.New Injection Molding Technology-Water-Assisted Injection Molding[J]. Plastics,2009, 38(5):41-44.
[10] 汪志泳,黄汉雄,汪斌.水辅助注塑中高压水穿透过程的数值模拟[J].化工学报, 2013, 64,(4):43-48. WANG Z Y, HUANG H X, WANG B. Numerical Simulation of Water Penetration in Water-Assisted Injection Molding[J]. CIESC Journal, 2013, 64(4):43-48.
[11] 章凯,匡唐清,柳和生.注水压力对圆管件水辅注塑填充过程的影响[J].高分子材料科学与工程, 2016, 32(6):113-117. ZHANG K, KUANG T Q, LIU H S, et al. Influence of Water Injection Pressure on Water-Assisted Injection Molding Filling Process[J]. Polymer Materials Science and Engineering, 2016, 32(6):113-117.
[12] 匡唐清,邓洋,余春丛.溢流法水辅注塑中注水参数对水穿透的影响分析[J].中国塑料, 2014, 28(7):102-105. KUANG T Q, DENG Y, YU C C.Experimental Investigation of the Effects of Water Parameters on Water Penetration During Overflow Water-Assisted Injection Mol-ding Process[J]. China Plastics, 2014,28(7):102-105.
[13] YANG J G, ZHOU X H, LUO G P. Study of Water Penetration Length and Processing Parameters Optimization in Water-assisted Injection Molding[J]. International Journal of Advanced Manufacturing Technology, 2013, 69(9/12):2 605-2 612.
[14] HUANG H X, ZHOU R H, YANG C. Fiber Orientation Propelled by High-pressure Water Penetration in Water-assisted Injection Molded Fiber-reinforced Thermoplastics Part[J]. Journal of Composite Materials, 2013, 47(2):183-190.
[15] 匡唐清,邓洋.注水参数对水辅助注射成型充填过程影响的数值模拟[J].中国塑料, 2014, 28(2):102-106. KUANG T Q, DENG Y. Numerical Simulation of Effect of Water Injection Parameters on Water-Assisted Injection Molding Filling Process[J]. China Plastics, 2014, 28(2):102-106.
[16] PROTTE R, BANGERT H, COOPER C,et al. Water-assist Injection Molding-an Innovative Process Technology for Productivity Improvement: Developments in Processing, Equipment and Materials[C]//Proceedings of the 61st Annual Technical Conference of SPE, Nashville. Brookfield: SPE/ANTEC, 2003:404-408.
[17] 张增猛.水辅成型充模流动的纯水液压比例压力控制[D].杭州:浙江大学, 2009.