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流体-弹丸辅助注射成型(FPAIM)技术的成型本质不同于流体辅助注塑成型(FAIM)。为研究其成型特点,基于装备有自行研发设计的流体-弹丸辅助注射单元的注塑机进行FPAIM成型实验,并与FAIM工艺进行了对比分析。结果表明,FAIM工艺的壁厚和穿透长度受流体介质、工艺方法等诸多因素影响,壁厚和穿透长度均难以有效控制,而FPAIM工艺由于引入了固体弹丸,其壁厚主要取决于弹丸的截面尺寸,壁厚可更薄、更均匀、更可控;短射法FPAIM管件的穿透长度亦可以根据均匀的壁厚数值,通过计算射胶量实现较为精确的控制;FAIM短射法存在二次穿透,而FPAIM短射法在未穿透段内部会出现缩孔。
The forming nature of Fluid-Peen Aid (FPAIM) technology differs from fluid-assisted injection molding (FAIM). In order to study its molding characteristics, a FPAIM molding experiment was carried out on the injection molding machine equipped with a fluid-projectile-assisted injection unit designed and developed by itself and compared with the FAIM process. The results show that the wall thickness and penetration length of the FAIM process are affected by many factors such as the fluid medium and the process method, and the wall thickness and the penetration length can not be effectively controlled. However, the wall thickness of the FPAIM process mainly depends on the projectile Of the cross-sectional size, the wall thickness can be thinner, more uniform and more controllable; short shot method FPAIM pipe penetration length can also be based on uniform wall thickness value, by calculating the amount of shot to achieve more accurate control; FAIM short shot There is a second penetration, and FPAIM short shot in the non-penetration section will appear within the shrinkage.