Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)
- 2003.10b
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- Pages.73-79
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- 2003
A STUDY ON DISTORTION OF BEVEL GEARS AND DIE INDUCED BY FORGING AND HEAT TREATMENT
- Cho J.R. (Division of Mechanical & Information Engineering, Korea Maritime University) ;
- Kang W.J. (Division of Mechanical Engineering, Pusan National University) ;
- Kim M.G. (Division of Mechanical Engineering, Pusan National University) ;
- Lee J.H. (Department of Material Processing, Korea Institute of Machinery & Materials) ;
- Lee Y.S. (Department of Material Processing, Korea Institute of Machinery & Materials) ;
- Bae W.B. (Division of Mechanical Engineering, Pusan National University)
- Published : 2003.10.01
Abstract
Recently many kinds of gears have been produced by forging in order to enhance the mechanical properties of the gears and the productivity of the process. Developments in forging technology are the reason for the increased usage. However, a critical problem of the forged gears is the dimensional change or distortion caused by elastic recovery after forging, and relief of the residual stresses during subsequent heat treatments. Distortion is of great concern to the manufacturers of precision parts, because it influences directly the dimensional accuracy and the grade of carburized bevel gears. In the present paper, distortion due to cold forging and heat treatment of bevel gears is investigated. Distortions of forged gears, machined gears and die are measured and compared. Numerical analysis is used to simulate the complete cold forging process and heat treatment process for the machined gears and shows good agreement with the experimental measurements.