Effect of CBN Grinding on the Bending Strength of Carburized Gears

[+] Author and Article Information
K. Inoue, M. Yamanaka, M. Kato

Graduate School of Engineering, Tohoku University, Aramaki-Aoba, Sendai 980-8579, Japan

H. Sonoda

East Japan Railway, 1-6-5 Hiromachi, Shinagawa, Tokyo 140-0005, Japan

G. Deng

Faculty of Engineering, Miyazaki University, 1-1 Gakuen Kibanadai-Nishi, Miyazaki 889-2192, Japan

J. Mech. Des 120(4), 606-611 (Dec 01, 1998) (6 pages) doi:10.1115/1.2829322 History: Received December 01, 1997; Revised July 01, 1998; Online December 11, 2007


The surface condition of a carburized gear is improved by CBN grinding, in addition to the generation of a compressive residual stress at the ground surface. To clarify the effect of these merits on the strength enhancement, a bending fatigue test is performed for the carburized and the CBN-ground gears. The fillet as well as involute tooth surface is ground by an electroplated threaded CBN wheel. The low axial feed rate and the spark-out treatment are effective in improving the surface finish and increasing the compressive residual stress, and the strengths of CBN-ground gears are increased from 100 MPa to 160 MPa in comparison with the carburized gears. Moreover, the test results are discussed on the basis of the fracture mechanics-based strength evaluation which has been proposed by the authors. This analysis demonstrates that the influence of CBN grinding on strength is smaller than the effects of surface-treatments such as shot peening and chemical polishing.

Copyright © 1998 by The American Society of Mechanical Engineers
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