DTIC ADA489290: Experimental Ejection Forces of Thermoplastic pdf

DTIC ADA489290: Experimental Ejection Forces of Thermoplastic

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The application of rapid prototyped tools for injection molding, if technically feasible, may allow for small quantity production by reducing the cost of tooling. This work has investigated one aspect of the technical feasibility through testing and experimentation to determine ejection force requirements and coefficients of friction. Injection molding experiments were conducted using three mold insert materials, P-20 steel, laser sintered ST-100, and stereolithography SL 5170 resin. Ejection forces for cylindrical parts molded with high density polyethylene and high impact polystyrene were measured directly and compared with values calculated from an ejection force differently, depending on the materials characteristics. Results show that ST-100 is a good candidate for injection molding tools, and that SL 5170 might be a candidate for molding some thermoplastics, but only in very small quantities

• Creator/s: Defense Technical Information Center
• Date: 6/1/2007
• Year: 2007
• Book Topics/Themes: DTIC Archive, Kinsella, Mary E, AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE, *FRICTION, *INJECTION MOLDING, COEFFICIENTS, HIGH DENSITY, THERMOPLASTIC RESINS, COST REDUCTION, IMPACT, INSERTS, TOOLING, POLYSTYRENE, POLYETHYLENE

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