溢流法水驱动弹头辅助注塑管件残余壁厚的形成与工艺参数影响
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摘要
溢流法水驱动弹头辅助注塑(W-PAIM-O)工艺可制得残余壁厚(RWT)更薄更均匀的管件。采用模拟手段分析了W-PAIM-O工艺中RWT的形成机理,采用单因素实验法考察了熔体温度、熔体注射压力、注水延迟时间、注水压力和模具温度5个工艺参数对RWT的影响。模拟发现,RWT不仅主要取决于弹头的截面尺寸,还与弹头穿透时对侧面熔体的拖曳作用有关;在考察的几个工艺参数中,熔体温度越高,RWT越小,但熔体温度过高时RWT反而增大;熔体注射压力越大RWT越小,但熔体注射压力过大反而使RWT增大;随着模具温度的升高,RWT变薄,模具温度超过一定值后,RWT趋于稳定;RWT随注水延迟时间的延长而变厚;注水压力对W-PAIM-O管件RWT影响较小。
Overflow water-projectile-assisted injection molding(W-PAIM-O) technology can be used to manufacture pipes with more thinner and more even residual wall thickness(RWT). Numerical simulation was performed to analysis the formation mechanism of the RWT of W-PAIM-O pipe. Single factor experiments were carried out to study the effects of processing parameters such as melt temperature, melt injection pressure, water injection delay time, water pressure, and mold temperature on RWT of W-PAIM-O pipe. It is found from the simulation results that the RWT of the pipe is not only determined by the cross-section of the projectile,but also by the effect of the towing area which is located at the side of projectile. The influences of the five processing parameters on the RWT of W-PAIM-O pipe were discovered from the experimental results. The RWT decreases with increasing the melt temperature while increases with a too high melt temperature. The higher the melt injection pressure is, the smaller the RWT is, but the RWT increases when the melt injection pressure is too high. With the increase of mold temperature, the RWT becomes thinner and the RWT tends to be stable after the mold temperature exceeds a certain value. The RWT increases with increasing the water injection delay time. Water pressure has little influence on the RWT of W-PAIM-O pipe.
Overflow water-projectile-assisted injection molding(W-PAIM-O) technology can be used to manufacture pipes with more thinner and more even residual wall thickness(RWT). Numerical simulation was performed to analysis the formation mechanism of the RWT of W-PAIM-O pipe. Single factor experiments were carried out to study the effects of processing parameters such as melt temperature, melt injection pressure, water injection delay time, water pressure, and mold temperature on RWT of W-PAIM-O pipe. It is found from the simulation results that the RWT of the pipe is not only determined by the cross-section of the projectile,but also by the effect of the towing area which is located at the side of projectile. The influences of the five processing parameters on the RWT of W-PAIM-O pipe were discovered from the experimental results. The RWT decreases with increasing the melt temperature while increases with a too high melt temperature. The higher the melt injection pressure is, the smaller the RWT is, but the RWT increases when the melt injection pressure is too high. With the increase of mold temperature, the RWT becomes thinner and the RWT tends to be stable after the mold temperature exceeds a certain value. The RWT increases with increasing the water injection delay time. Water pressure has little influence on the RWT of W-PAIM-O pipe.
引文
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[17] 匡唐清,赖德炜,潘俊宇,等.水驱动弹头辅助注塑管件壁厚的工艺影响[J].高分子材料科学与工程,2018,34(12):106-111.Kuang T Q,Lai W D,Pan J Y,et al.Effects of processing method and parameters on the residual wall thickness of water- projectile-assisted injection molding pipes[J].Polymer Materials Science & Engineering,2018,34(12):106-111.
[2] Hopmann C,Michaeli W,Gründler M,et al.Process development of the projectile injection technique (PIT)[C].Boston :Annual Technical Conference of the Society of Plastics Engineers 2011 ,ANTEC 2011:1706-1710.
[3] 匡唐清,刘文文,吴丽旋,等.流体驱动弹头辅助注塑技术[J].高分子材料科学与工程,2016,32(11):184-190.Kuang T Q,Liu W W,Wu L X,et al.Review of fluid- projectile-assisted injection molding technology[J].Polymer Materials Science & Engineering,2016,32(11):184-190.
[4] 刘文文,匡唐清,赖德炜,等.管件流体-弹丸辅助注射成型实验初步研究[J].塑料工业,2016,44(11):138-142.Liu W W,Kuang T Q,Lai D W,et al.Priliminary experimental investigation on the fluid-projectile-assisted injection molding pipes[J].China Plastics Industry,2016,44(11):138-142.
[5] Homburg B.Projectile injection technology for improved moulding of hollow articles/high savings possible/SPE awardv[EB/OL].[2006-08-8].http://www.plasteurope.com/news/R_CHLING_t206079.
[6] Moritz G,Tilo H.Method for producing polymeric hollow portion,involves forming cavity with respect to displacement of fluent molding material:DE,102011100132[P].2012-10-31.
[7] Janssen H,Jung-K?nig A.Herstellung eines thermoplastischen Gegenstandes mit einem Hohlraum Preparing a thermoplastic article with a cavity:DE ,102009031591[P].2011-01-13.
[8] Hopmann C,Behmenburg C.Manufacturing of elastomeric hollow bodies using the projectile injection technique[C].Cincinnati :Annual Technical Conference of the Society of Plastics Engineers 2013,ANTEC 2013:282-285.
[9] Hopmann C,Recht U.Manufacturing of fiber-reinforced,elastomeric parts using the injection moulding process[C].Orlando:Society of Plastics Engineering Technical Conference 2015,2015:1728-1732.
[10] 杨帆,匡唐清,刘文文,等.水驱动弹丸辅助注塑弯管的壁厚分布[J].高分子材料科学与工程,2017,33(11):112-118.Yang F,Kuang T Q,Liu W W,et al.Distribution of residual wall thickness of water-projectile-assisted injection molding pipes with curved sections[J].Polymer Materials Science & Engineering,2017,33(11):112-118.
[11] Li L,Peng Y G,Wei W.Recent advances on fluid assisted injection molding technique[J].Recent Pat.Mech.Eng.,2014,7:82-91.
[12] Park H P,Cha B S,Park S B,et al.A study on the void formation in residual wall thickness of fluid-assisted injection molding parts[J].Adv.Mater.Sci.Eng.,2014,2014:1-6.
[13] 匡唐清,邓洋,余春丛,等.短射法水辅助注塑工艺水穿透的实验分析[J].高分子材料科学与工程,2015,31(4):121-126.Kuang T Q,Deng Y,Yu C C,et al.Water penetration during short-shot water-assisted injection molding process[J].Polymer Materials Science & Engineering,2015,31(4):121-126.
[14] Kuang T Q,Xu B P,Zhou G F,et al.Numerical simulation on residual thickness of pipes with curved sections in water-assisted co-injection molding[J].J.Appl.Polym.Sci.,2015,132:DOI:10.1002/app.42468.
[15] 匡唐清,黄淑慧,余春丛,等.圆管件溢流法流体辅助注塑实验分析[J].塑料工业,2015,43(2):45-48.Kuang T Q,Huang S H,Yu C C,et al.Experimental study of overflow fluid-assisted injection molding circular tubes[J].China Plastics Industry,2015,43(2):45-48.
[16] Knights M.Water injection molding makes hollow parts faster lighter[J].Plast.Tech.,2002,48:42-47.
[17] 匡唐清,赖德炜,潘俊宇,等.水驱动弹头辅助注塑管件壁厚的工艺影响[J].高分子材料科学与工程,2018,34(12):106-111.Kuang T Q,Lai W D,Pan J Y,et al.Effects of processing method and parameters on the residual wall thickness of water- projectile-assisted injection molding pipes[J].Polymer Materials Science & Engineering,2018,34(12):106-111.