Kim, CH Lee, SC Ahn, HS Chong, TH 2024-01-21T14:36:26Z 2024-01-21T14:36:26Z 2021-09-05 2000-01 1226-4865 https://pubs.kist.re.kr/handle/201004/141683 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. English KOREAN SOC MECHANICAL ENGINEERS Cavity design method for injection-molded spur gears Article 10.1007/BF03184772 1 KSME INTERNATIONAL JOURNAL, v.14, no.1, pp.65 - 71 KSME INTERNATIONAL JOURNAL 14 1 65 71 N scie scopus 000084625500008 2-s2.0-0033632366 Engineering, Mechanical Engineering Article gear cavity injection molded gear shrinkage rate