Visualization-based Study on the Penetration Process of Liquid Carbon Dioxide-assisted Injection Molding Process
YANG Fan1, LIU Hesheng2,*, KUANG Tangqing2,*, LIANG Jiankang2
1 Fundamental Experiment and Engineering Practice Center, East China Jiaotong University, Nanchang 330013, China 2 School of Mechatronics & Vehicle Engineering, East China Jiaotong University, Nanchang 330013, China
Abstract: To overcome the invisibility of the molding process within enclosed cavities in the fluid-assisted injection molding (FAIM) and its derivative processes, study the penetration process of fluid and projectile, a set of visual molds was designed to capture the flow behavior of the melt and the penetration process of fluid in the cavity through a high-speed camera. Based on this, the penetration morphology and penetration speed of fluid during the process were obtained, thus analyzing the penetration mechanism of the process. The results indicate that both the penetration fronts of the fluid and the projectile exhibit streamlined shapes, and the occurrence of defects in the tubular parts is closely related to changes in the physical properties of the medium fluid. In liquid carbon dioxide-assisted injection molding (LCO2-AIM), an increased melt injection volume within a certain range leads to improved inner wall quality of the formed tubular parts, while a higher fluid injection pressure results in a more signi-ficant reduction in fluid penetration velocity. In liquid carbon dioxide-powered projectile-assisted injection molding (LCO2-PAIM), as the fluid injection pressure increases, the penetration speed of the projectile in the visualization area increases and the decrease decreases; as the injection delay time of projectile increases, the trend of the projectile penetration speed is similar, and the decrease in magnitude decreases.
杨帆, 柳和生, 匡唐清, 梁健康. 基于可视化的液态二氧化碳辅助注塑工艺穿透过程的研究[J]. 材料导报, 2025, 39(21): 24070128-7.
YANG Fan, LIU Hesheng, KUANG Tangqing, LIANG Jiankang. Visualization-based Study on the Penetration Process of Liquid Carbon Dioxide-assisted Injection Molding Process. Materials Reports, 2025, 39(21): 24070128-7.
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2025, Vol. 39 
