Cavity design method for injection-molded spur gears
- Cavity design method for injection-molded spur gears
- 김충현; 이성철; 안효석; 정태형
- Gear Cavity; Injection Molded Gear; Shrinkage Rate
- Issue Date
- KSME International Journal
- VOL 14, NO 1, 65-71
- Mold cavities of gears should be made larger than the product specification since plastics
shrink when changing from a molten to a solid state. For injection molded spur gears, two
design methods for the compensation of shrinkage are widely used. One is the module correction
method and the other is the pressure angle correction method. Both methods are based on the
assumption that shrinkage occurs toward the center of a molded gear. This paper deals with the
shrinkage rate and proposes a method of designing gear cavity derived from the measured
shrinkage rates which govern the outside diameter, the tooth depth and the tooth thickness of
a molded gear. The proposed method imposes no restriction on the shrinkage direction and
provides a cavity with all of the fundamental gear design parameters.
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