Manufacturing method that uses laser surface transformation...

Details Manufacturing method that uses laser surface transformation... Manufacturing method that uses laser surface transformation...

2005-09-21

2009-11-03

Paik, Sang Y (Department: 3742)

Electric heating

Metal heating

By arc

C430S302000

Reexamination Certificate

active

07612314

ABSTRACT:
A laser ablation method is used to polish a bearing surface of an automotive crankshaft. A laser ablation device generates a laser according to parameters such as wavelength, pulse duration, pulse repetition rate, and beam quality. The laser is applied to the surface of a rotating engine component, such as a crankshaft, as the component is rotated in order to polish the surface according to the parameters. The laser substantially improves tribological performance of the bearing surface by changing the waviness and form of the surface profile. Further, oil-retention reservoirs are formed in the surface. As a result, the friction coefficient of the crankshaft surface is reduced while the roughness of the crankshaft surface is maintained, reduced, or increased.

REFERENCES:
patent: 5648127 (1997-07-01), Turchan et al.
patent: 6739238 (2004-05-01), Ushijima et al.
patent: 2001/0015180 (2001-08-01), Tinney
patent: 2005/0188942 (2005-09-01), Hamada et al.

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