Kobe Steel, Ltd.

Yasuhiro Wasa

Toshihide Fukui

Akira Okamoto

Norio Suzuki

Kota Nomura

Tetsuo Yamaji

Hideyuki Chikuri

A method for inspecting a test object for defects by using an ultrasonic probe including a transmitter, a wedge, and a receiver, the method comprising: placing the ultrasonic probe on the test object; transmitting ultrasound from the transmitter into the wedge such that surface waves propagate along a surface area of the test object; and determining that there is a defect in a part of the test object overlapped with the wedge when the receiver receives an ultrasonic echo, after the transmission of the ultrasound by the transmitter, in a time shorter than a time required to receive a front end-reflected ultrasonic echo produced by reflection of the surface waves at a front end of the wedge.

Inspection method

A crankshaft flaw detection device () used for detecting flaws in the crank pin, web, and fillet section of a crankshaft comprises: a pair of shaft flaw detection heads () configured so as to be capable of sandwiching the crank pin (C) therebetween, and having a first probe () capable of detecting flaws on the shaft surface of the crank pin (C) or a second probe () capable of detecting flaws in a fillet section at the base of the shaft; and a perpendicular surface flaw detection head () configured so as to be capable of coming in contact with the crank pin (C) and having a third probe () capable of detecting flaws in the side surface of the web (C). The crankshaft flaw detection device () is characterized by the perpendicular surface flaw detection head () and the pair of shaft flaw detection heads () being movable within the perpendicular surface

Crankshaft flaw detection device

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Kobe, Japan

Yasuhiro Wasa