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根据DEM模型,对不同射料口位置的射料充填过程进行数值模拟。建立了欧拉/拉格朗日离散颗粒模型,采用数值模拟方法,研究消失模铸造泡沫珠粒射料充填过程中稠密气/固两相流动的流体动力学特性。泡沫珠粒的运动与气相压力分布密切相关,泡沫珠粒充填过程中在排气塞附近区域形成型腔内外压力差,是珠粒充填的动力。在其他条件相同时,对两种不同射料口位置条件下的射料充填过程进行了数值模拟。结果表明,射料口应当布置在型腔较宽的部位,尽量减少射料口附近和泡沫珠粒运动方向上的障碍,使料流运动顺畅。
According to the DEM model, the numerical simulation of the shot filling process at different shot positions is carried out. The Euler / Lagrange discrete particle model was established and the numerical simulation method was used to study the hydrodynamics of dense gas / solid two-phase flow in the process of foam injection molding of EPC foam. The movement of foam beads is closely related to the distribution of gas phase pressure. The pressure difference between the inside and the outside of the cavity formed in the vicinity of the exhaust plug during foam bead filling is the driving force for bead filling. When the other conditions are the same, the numerical simulation of the shot filling process under two different positions of shot entrances is carried out. The results show that the material outlet should be arranged in a wide part of the cavity to minimize the obstacles in the movement direction of the material near the material inlet and the foam bead so as to make the material flow smoothly.