【摘要】 为了建立气辅控制系统的控制模型,系统研究了气辅注射工艺参数对气辅共注成型过程的影响规律。研究表明,保压时间和气体注射延迟时间对气辅共注成型的气体穿透有较大影响,而对芯层熔体的穿透影响不明显。随着保压时间的延长,气体的穿透深度和穿透宽度均增加,而随着气体注射延迟时间的延长,气体穿透深度增大,穿透宽度减小。延长气体注射延迟时间有利于气体的穿透,但易出现指进现象和气体穿透流动的不稳定。更多还原

【Abstract】 In order to formulate the controlling model of the gas assisted controlling unit,experiments on the influence of processing parameters in the gas-assisted co-injection molding were investigated in this paper.It showed that the gas packing time and gas delay time affected the gas penetrating pattern appreciably,but not the melt at the core layer.With increasing gas packing time,the gas penetrating depth and width increased,with increasing gas delay time,gas penetrating depth increased,the gas penetrating width reduced,however,the instability of gas penetrating flow and finger appearance were observed.更多还原