Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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A Study on the Extrusion Using Two-Step Processes for Manufacturing Helical Gear

2단계공정을 이용한 헬리컬기어 압출에 관한 연구

  • 정성윤 (부산대학교 기계기술연구소) ;
  • 박준홍 (동아대학교 신소성재RIC센터) ;
  • 김창호 (동의대학교 기계공학과) ;
  • 장영준 (부산대학교 기계공학부) ;
  • 김철 (부산대학교 기계기술연구소)
  • Published : 2007.08.01
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Abstract

In this study, focusing on reducing a load in forming helical gears, the extrusion using two-step processes for manufacturing helical gear is proposed. The process is composed of the extrusion step in which spur gear to be used as a preform in next step is formed, and the torsion step in which the preform of spur gear is formed to helical gear. Upper-bound theory for the two-step process is applied and compared with the results of experiment. The result of upper-bound solution has a good agreement with that of the experiment and the FE analysis. The newly proposed method can be used as an advanced forming technique to remarkably reduce a forming load, to prolong a tool life, and to replace the conventional forming process of helical gears. Results obtained from the extrusion using two-step processes enable the designer and manufacturer of helical gear to be more efficient in this field.

Keywords

References

  1. Samanta, S. K., 'Helical gear: A noble method of manufacturing it,' Proc. 4th North American Metalworking Research Conf., Battele's Columbus Labs, Society of Manufacturing Engineers, pp. 199-205, 1976
  2. Choi, J. C., Cho, H. Y., Kwon, H. H. and Lee, E. H., 'A New Cold Extrusion Process of Helical Gear and its Upper Bound Analysis,' J. of the Korean Society for Precision Engineering, Vol. 9, No.3, pp. 12-28, 1992
  3. Choi, J. C., Cho, H. Y. and Kwon, H. H., 'A new extrusion process for helical-gears : experimental study,' J. Mater. Process. Technol., Vol. 44, Issues 1-2, pp. 35-53, 1994 https://doi.org/10.1016/0924-0136(94)90033-7
  4. Park, Y. B. and Yang, D. Y., 'Finite element analysis for precision cold forging of helical gear using recurrent boundary conditions,' IMechE Proc. Inst. Mech. Eng., Part B, Vol. 212, No. 3, pp. 231 - 240, 1998
  5. Choi, J. C., Choi, Y. and Talc, S. J., 'The forging of helical gears(I) : experiments and upper-bound analysis,' International Journal of Mechanical Sciences, Vol. 40, No.4, pp. 325.337, 1998
  6. Choi, J. C., Choi, Y. and Tak, S. J., 'The forging of helical gears (II) : comparisons of the forging processes,' International Journal of Mechanical Sciences, Vol. 41, No.6, pp. 725-739, 1999 https://doi.org/10.1016/S0020-7403(98)00034-4
  7. Choi, J. C. and Choi, Y.. 'Precision forging of spur gears with inside relief,' International Journal of Machine Tools and Manufacture, Vol. 39, Issue 10, pp. 1575-1588, 1999 https://doi.org/10.1016/S0890-6955(99)00015-2