水驱动弹丸辅助注塑管件壁厚的弹丸影响

Effect of Projectile on Residual Wall Thickness of Water-projectile-assisted Injection Molded Pipes

对水驱动弹丸辅助注塑(W-PAIM)中弹丸对管件壁厚的影响进行了实验与分析。通过搭建实验平台研究了弹丸的材质、头部形状、直段长度、截面尺寸这4个因素对聚丙烯(PP)的W-PAIM管件残余壁厚的影响。结果表明,在聚酰胺6(PA6)、丙烯腈-丁二烯-苯乙烯共聚物(ABS)、聚四氟乙烯(PTFE)、PP 4种弹丸材质中PA6弹丸成型的管件的残余壁厚于比其他材质弹丸成型管件更加均匀,质量更好;在半球形、抛物线形、圆弧形及锥体形的4种头部形状中抛物线形能获得较好的质量管件;直段区长度为7 mm,截面尺寸为13 mm的弹丸所制得的管件残余壁厚最均匀,质量最佳。

An experimental study was carried out to investigate the effect of the projectile on the wall thickness of pipe fitting in the water-projectile-assisted injection molding(W-PAIM).Through constructing an experimental platform,the effect of the four factors including the projectile material,head shape,straight length and cross-sectional size on the residual wall thickness of the W-PAIM polypropylene(PP)pipe fittings were studied.A comparative experiment showed that the residual wall thickness of the pipe fitting formed by the PA6 projectile was more uniform than those of the PA6,ABS and PTFE projectiles,indicating the optimum quality.Among the heads with the hemispherical,parabolic,arc and conical shapes,the parabolic head achieved the optimum quality fittings.For the projectile with a length of 7 mm in straight section and a section size of 13 mm,the obtained residual wall thickness was the most uniform and the quality of the molded pipe fitting was the best.