The Study of Forming Quality of the Counter Pressure Mechanism on Liquid-assisted Injection Molding

• Main Authors: KUI-YU LI, 李奎昱
• Other Authors: Wen-Ren Jong
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/q6rnxz

碩士 === 中原大學 === 機械工程研究所 === 102 === Liquid-Assisted Injection Molding(LAIM) is short shot filling plastic melt. When center layer plastic melt under melting state add liquid let finished presented hollow. The purpose is Use hollow forming and liquid feature can reached save materials and upgrade finished quality. In LAIM, The assisted liquid penetration capability is impact process main factor. Liquid penetration capability than gas higher and Incompressibility capability easy produce finished center layer orderless. Impact liquid penetration capability parameters is liquid pressure and temperature. Control Pressure need mobile directions install pressure sensors, and use liquid assisted machine variable adjustment changes, and observation pressure changes for finished impact. Control temperature need near mold side install temperature sensors, and mobile directions outside pack insulation foam reduce heat diffuse. In this study, use visualization mold and paperclip shape mold insert. Record Gas Counter Pressure(GCP) under finished plastic melt flow state and liquid penetration capability and epidermal layer thickness changes by the visualization window and the plastic join particle. GCP LAIM and GCP GAIM make than penetration capability and thickness changes. Use changes liquid viscosity , the study of viscosity for liquid penetration capability impact. Get on GCP applications in LAIM mold flow analysis and real mobile state prove. Complete LAIM combined GCP database. The results of Experiments analysis, join GCP can subjoin liquid penetration stability, although reduce finished hollow area, but can upgrade finished penetration length cause overall penetration average. In GCP LAIM and GCP GAIM compare section. LAIM because liquid incompressibility and thermal fast, so it need forming pressure hold time short in penetration average and stable also than GAIM. Improve injection liquid viscosity can change heat conduction and viscous force, further change finished penetration length and hollow area.