Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
권호 표지

Evaluation of Formability for Warm Forging of The Bevel Gear on The Lubricants and Surface Roughness

윤활제 및 표면 거칠기에 따른 베벨기어의 온간단조 성형성 평가

  • 김동환 (진주국제대학교 자동차공학과) ;
  • 김병민 (부산대학교 기계공학부)
  • Published : 2005.03.01
Download PDF
⟨ Previous Next ⟩

Abstract

In the hot forging process lubricant influences on frictional condition only, but in the warm forging process it influence on the formability such as dimensional accuracy, filling state and frictional condition and it is important to estimate a lubricating characteristic of lubricants in the warm forging. In this paper, in order to evaluate the formability of billet in warm forging process according to the lubricant and lubricating method, lubricant and lubricating test have been performed using oil-based and water-based lubricant which were widely used in the hot and warm forging processes. The surface roughness of initial billet was measured to evaluate the influence on the formability of billet and the forming load and dimensional accuracy were compared and evaluated. From the experimental results, it can be known that water-based lubricants are more excellent than oil-based lubricants for warm forging of complex shape like a bevel gear. Also, in this study characteristics of deformation have been investigated according to surface treatment of initial billet.

Keywords

References

  1. Dean, T. A. 'Concepts and practice in precision forging,' 7th Int. Congress Cold Forging, Birmingham, pp. 15-23, 1985
  2. Dommelen, H. V. and Hirschvogel, M., 'Some application of cold and warm forging,' Journal of Mat. Proc. Tech., Vol. 35, pp. 343-356, 1992 https://doi.org/10.1016/0924-0136(92)90326-N
  3. Sheljaskov, S., 'Halbwarmumformung,' a Tangewandte Technik, Pressen+Walzen, pp. 106-110, 1993
  4. Doege, E. and Thalemann, J., 'Near-net-shape forming in sheet metal forming and forging,' Annals of CIRP, Vol. 38/2, 1989
  5. Kim, D. H. and Kim, B. M., 'Preform design of the bevel gear for the warm forging using artificial neural network,' Journal of the KSPE, Vol. 20, No.7, pp. 36-43, 2003
  6. Meidert, M., Knoerr, M. and Altan, T., 'Investigation of physical and numerical modelling of bevel gear forming,' Report No. B-91-13, Engineering Research Center for Net Shape Manufacturing, Columbus, OH, May, 1991
  7. Westphal, K., Knoerr, M. and Altan, T. 'Computer-aided design of cold forging punches,' Report No. B-D-92-08, engineering Research Center for Net Shape Manufacturing, Columbus, OH, March, 1992
  8. Doege, E. and Weber, F., 'Jot forging of precision parts,' Journal of Mat. Proc. Tech., Vol. 35, pp. 569-481, 1992
  9. Meidert, M., Knoerr, M., Wesphal, K. and Altan, T., 'Numerical and physical model1ing of cold forging of bevel gears,' Journal of Mat. Proc. Tech., Vol. 33, pp. 75-93, 1992 https://doi.org/10.1016/0924-0136(92)90312-G
  10. Doege, E. and Nagele, H., 'FE simulation of the precision forging process of bevel gears,' Annals of the CIRP, Vol. 43, pp. 241-244, 1994 https://doi.org/10.1016/S0007-8506(07)62204-5
  11. Sheljaskov, S., 'Warm forging-a technology for manufacturing of precision components,' Proceedings of the 5th international Conference on Technology of Plasticity, Vol. 1, pp. 485-490, 1996
  12. Iwama, T. and Morimoto, Y., 'Die life and lubrication in warm forging,' Journal of Mat. Proc. Tech., Vol. 71, pp. 43-48, 1997 https://doi.org/10.1016/S0924-0136(97)00141-6
  13. Jeong, D. J., Kim, D. J. and Kim, B. M., 'Evaluation of friction shear factor by the lubricating methods in warm forging,' Journal of the KSTP, Vol. 10, No.4, pp. 319 - 328, 2001