液态二氧化碳辅助注塑相间穿透数值模拟OA

Liquid carbon dioxide-assisted injection molding(LCO2-AIM)is a new process derived from fluid-assisted injection molding(FAIM).To analyze the interphase penetration mechanism of LCO2-AIM,the penetration process of LCO2 in LCO2-AIM was numerically simulated by fluid dynamics methods,and the residual wall thickness distribution law and the penetration behavior of fluid medium were compared and analyzed with water-assisted injection molding(WAIM)and gas-assisted injection molding(GAIM).The results indicated that the residual wall thickness of the three processes all showed a trend of gradually thickening along the flow direction.Among them,the overall residual wall thickness of WAIM was the thinest and that of GAIM was the thickest.The residual wall thickness of LCO2-AIM was similar to that of WAIM in the front section,then a significant increase in the middle section,and finally was similar to that of GAIM in the back section with a large fluctuation compared to WAIM and GAIM.In terms of fluid penetration velocity,all three showed a trend of first increasing and then decreasing.Among them,the overall velocity of WAIM was the lowest and followed by GAIM,while the penetration velocity of LCO2-AIM was the highest and the velocity gradient in the radial direction was the largest.