Metal working – Method of mechanical manufacture – With testing or indicating
Reexamination Certificate
2006-10-10
2006-10-10
Hong, John C. (Department: 3726)
Metal working
Method of mechanical manufacture
With testing or indicating
Reexamination Certificate
active
07117574
ABSTRACT:
A method of determining expected fatigue life of machined bearing races or other components wherein a hardened surface of each bearing race is machined to provide a machined surface including the steps of determining hardness distribution and residual stress distribution along a depth into the machined surface as a function of cutting parameters, determining a relationship of expected fatigue life of the machined bearing races as a function of the hardness distribution and the residual stress distribution using a fracture mechanics model, and determining expected fatigue life from the relationship using actual cutting parameters employed in machining the hardened surface of the bearing races. Cutting conditions to optimize fatigue life can be selected based on the expected fatigue life.
REFERENCES:
patent: 3817796 (1974-06-01), Kramer I
patent: 5878496 (1999-03-01), Liu et al.
patent: 6823740 (2004-11-01), Huang
patent: 2001/0047675 (2001-12-01), Arola et al.
Bingyuan et al., “Calculation for Rolling Contact Fatigue Life and Strength of Case-Hardened Gear Materials by Computer”, Journal of Testing and Evaluation, 1993, 21(1), pp. 9-13.
Guo et al., “Residual Stress Formation Mechanism and its Control by Sequential Cuts”, Transactions of NAMRI/SME, May 2000, vol. XXVIII, pp. 179-184.
Liu et al., “The scatter of surface residual stresses produced by face-turning and grinding”, Journal of Machining Science and Technology, 2001, vol. 5, No. 1, pp. 1-21.
Yang et al., “An Experimental Study on Fatigue Life Variance, Residual Stress Variance, and Their Correlation of Face-Turned and Ground Ti 6A1-4V Samples”, Journal of Manufacturing Science and Engineering, Nov. 2002, vol. 124, pp. 809-819.
Agha Salah Ramadan
Liu Chunghorng R.
Hong John C.
Purdue Research Foundation
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