气辅成型制品气道优化设计研究

Study on Optimal Design of Gas Channel in Gas-assisted Injection Molding

采用数值模拟技术对气辅成型制品设计中带有半圆形气道和矩形气道的2种基本气道类型的聚苯乙烯板类件进行了模拟分析和物理模拟实验。根据气体穿透长度、气腔形状、残余壁厚及气道缺陷等主要参数,建立了气道质量评价标准。结果表明,对于半圆形气道,当气道半径为制品壁厚的2倍左右时气腔质量最佳;对于矩形气道,在气道宽度和壁厚相同的情况下,随着气道高度和气道宽度的增加,气体穿透后形成的气腔质量逐渐提高,当气道高度和气道宽度的比值达到2.0时,且气道宽度对制品壁厚的比值也达到2.0时,气腔质量最好,气道最优。

Numerical simulation and laboratory experiments were carried out to analyze two kinds of polystyrene plates with either semi circle or rectangular gas channel. Based on the main processing parameters such as gas penetration length, gas channel shape, residue thickness, and gas channel defects, the evaluating standard of the quality of gas channel was established. For semi-circle gas channel, the radius was 2 times that of the plate wall thickness, and the quality of gas channel was the best. For rectangular gas channel, when the width of gas channel and the wall thickness kept constant, the quality of gas channel would improve with increase of the height and width of gas channel; when the height of gas channel was 2 times of the width of gas channel, and the width of gas channel was 2 times of the plate wall thickness, the quality of gas channel was the best.