Measuring and testing – Vibration – By mechanical waves
Patent
1989-10-20
1991-04-09
Noland, Tom
Measuring and testing
Vibration
By mechanical waves
G01N 2904
Patent
active
050054171
ABSTRACT:
In a method of detecting defects formed in a surface or in the vicinity thereof of a ball of a bearing by means of an ultrasonic wave, the ball and a probe for projecting an ultrasonic wave toward the ball and receiving an ultrasonic wave reflected from the detects are arranged in water in such a manner that a center axis of the probe is deviated from a normal axis of the ball which passes through a center of the ball and extends in parallel with the center axis of the probe by such a displacement amount that the ultrasonic wave refracted by the ball propagates along the surface of ball. The ball is rotated about a horizontal axis perpendicular to the normal axis, and the ball and probe are rotated relative to each other about a center axis of the ball which is perpendicular both to the normal axis and horizontal axis of the ball, so that the whole surface of the ball is scanned automatically with the ultrasonic wave.
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Kawasaki Keiji
Matsuhisa Tadaaki
Sekiguchi Michio
Arana Louis M.
NGK Insulators Ltd.
Noland Tom
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