文章摘要
水驱动弹丸辅助注塑弯管的壁厚分布
Distribution of Residual Wall Thickness of Water-Projectile-Assisted Injection Molding Pipes with Curved Sections
  
DOI:10.16865/j.cnki.1000-7555.2017.11.019
中文关键词: 水驱动弹丸辅助注射成型  管件  壁厚  数值模拟
英文关键词: water projectile-assisted injection molding  pipe  residual thickness  numerical simulation
基金项目:国家自然科学基金资助项目(51563010,21664002);江西省教育厅科学技术研究项目(150528)
作者单位
杨 帆1, 匡唐清2, 刘文文2, 柳和生3 1. 华东交通大学 工程训练中心 2. 华东交通大学 机电与车辆工程学院 3. 东华理工大学 机电工程学院江西 南昌 330013 
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中文摘要:
      水驱动弹丸辅助注塑技术(W-PAIM)是利用高压水驱动预置于模具型腔中的弹丸穿透熔料得到中空塑件的新型注塑工艺。采用实验与模拟相结合的方式研究了W-PAIM弯管的壁厚分布机理。通过比较水辅助注塑(WAIM)和W-PAIM弯管试样的壁厚,发现W-PAIM管件的壁厚要薄得多,其壁厚主要取决于弹丸截面尺寸及高压水对弹丸穿透边界熔体的挤压;对弯曲半径相同、偏转角不同的弯曲处壁厚的实验与模拟研究发现弯曲内侧壁厚薄、外层壁厚厚,且壁厚差随偏转角度增大而增大;对偏转角为90°,弯曲半径不同的弯曲处壁厚的实验与模拟研究发现,弯曲处壁厚差随弯曲半径的增大而减小。通过模拟结果分析发现,这都是由于弯曲处的压力分布特点与速度分布特点所致。
英文摘要:
      Water-projectile-assisted injection molding (W-PAIM) process, an innovative processing technology in which the pressurized water is utilized to drive a projectile to penetrate in the core melt, can be used to manufacture hollow plastic pipes. The residual wall thickness of W-PAIM pipes with curved sections was investigated via experiments and numerical simulations. The experiments results of WAIM and W-PAIM pipes were compared and it is found that the residual wall thickness of W-PAIM pipes is much thinner. The main influencing factors of the residual wall thickness of W-PAIM pipes are the section size of the projectile used and the squeezing of the pressurized water on the melt at the end of the projectile during the penetration. Experimental study and numerical simulation on the residual wall thickness of the W-PAIM pipes with curved sections of the same bend radius and different deflection angle were carried out. A thinner inner wall thickness and a thicker outer wall thickness are found at the curved sections and the wall thickness difference increases as the deflection angle increases. The thickness at the curved sections of different radius and the same deflection angle of 90° were investigated via experiment and simulations. It is found that the wall thickness difference decrease as the bend radius increases. The results can be explained by the characteristics of the pressure distribution and the velocity distribution at the bend segments which are discovered by the pressure field and velocity field from the numerical simulation results.
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