Experimental Ejection Forces of Thermoplastic Parts From Rapid Tooled Injection Mold Inserts (Preprint)

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 requir...

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Bibliographic Details
Main Authors: Kinsella, Mary E, Lilly, Blaine
Format: Report
Language:English
Subjects:
COEFFICIENTS
COEFFICIENTS OF FRICTION
COST REDUCTION
EJECTION FORCE
FRICTION
HIGH DENSITY
IMPACT
INJECTION MOLD INSERTS
INJECTION MOLDING
INJECTION MOLDING TOOLS
INSERTS
LASER SINTERED ST-100
Mechanics
Mfg & Industrial Eng & Control of Product Sys
P-20 STEEL
PE62102F
POLYETHYLENE
POLYSTYRENE
SL 5170 RESIN
THERMOPLASTIC PARTS
THERMOPLASTIC RESINS
THERMOPLASTICS
TOOLING
WUAFRL4347RGM02R2000
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Summary: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. The original document contains color images. All DTIC reproductions will be in black and white. Submitted for publication in Journal on Rapid Prototyping.