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Numerical Simulation Investigation on Interfacial Penetration Mechanisms in Liquid Carbon Dioxide-Powered Projectile-Assisted Injection Molding
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DOI：10.1002/pen.70684.png)
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Abstract
En 中文
Liquid carbon dioxide-powered projectile-assisted injection molding (LCO2-PAIM) uses a medium fluid with dual gas–liquid characteristics, enabling high-precision forming of hollow pipes. Numerical simulations compare LCO2-PAIM with gas-powered projectile-assisted injection molding (G-PAIM) and water-powered projectile-assisted injection molding (W-PAIM), revealing the role of LCO2 during interfacial penetration of the projectile. Results show that only the LCO2 directly in contact with the melt undergoes phase change; the bulk fluid remains liquid. Interfacial penetration induces a sharp pressure rise and nonlinear velocity growth. The thermophysical properties of the medium fluid govern melt flow behavior during projectile advancement. The residual wall thickness uniformity of LCO2-PAIM lies between those of W-PAIM and G-PAIM. Notably, the choice of fluid has negligible influence on the average wall thickness, yet it is the dominant factor controlling thickness uniformity. These results verify that LCO₂ is an appropriate alternative medium for balanced geometrical precision control of hollow pipes.
Keywords:
fluid assisted injection molding
numerical simulation
phase change
projectile
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