METHOD AND APPARATUS FOR MEASURING CARBURIZED DEPTH

摘要

PROBLEM TO BE SOLVED: To provide a method and apparatus for measuring a carburized depth, capable of eliminating the need for manufacture of a test piece, and capable of simply and accurately measuring the carburized depth without being affected by an individual difference.;SOLUTION: The method includes the steps of: creating an attenuation curve A by performing ultrasonic sweep on a reference test piece having no carburized layer within a predetermined frequency range; creating attenuation curves B', C', and D' by performing ultrasonic sweep on a plurality of known test pieces having known carburized depths within the predetermined frequency range; calculating areas S1, S2, S3, and S4 surrounded by the attenuation curves for each of the attenuation curves; creating a carburized depth master curve associated with the areas from each of the areas and the carburized depths of the known test pieces corresponding to the areas; creating an attenuation curve as to an unknown test piece having an unknown carburized depth and calculating an area surrounded by the attenuation curve; and measuring the carburized depth of the unknown test piece, using the area and the master curve.;COPYRIGHT: (C)2011,JPO&INPIT