Sensitivity adjusting method for roller body surface wave detection

Abstract

The invention discloses a sensitivity adjusting method for roller body surface wave detection. The method involves that when a surface wave probe is placed on the roller body surface and performs horizontal displacement toward the direction of a roller body right-angle end face, the roller body right-angle end face is a surface wave reflection body, a reflected wave amplitude gain of the roller body right-angle end face and displacement distance of the surface wave probe satisfy a certain relation; when the surface wave is detected, the probe moves along the roller body surface, the angle of the probe is adjusted to find a highest reflected wave gain, a sensitivity gain needed by the surface wave detection is added, for the sensitivity adjustment of the surface wave probe at different distance positions, the gain adjustment is performed by adopting a relational expression computing result between the reflected wave amplitude gain and the surface wave probe displacement distance. The sensitivity adjusting method for the roller body surface wave detection has the advantages that a manual defect standard sample roller is not needed to be produced for sensitivity correction, the production cost is reduced, the surface wave detection efficiency is improved, and the method is conductive to the ordered operation in work sites.

Description

technical field [0001] The invention relates to a sensitivity adjustment method for roll body surface wave detection. Background technique [0002] Usually in-service hot and cold rolls need to be ground after use. After grinding, to ensure the surface quality of the roll body, surface waves can be used for detection. For the inspection of near-surface defects, surface waves are very effective, because the energy of surface waves is concentrated in Within two wavelengths below the surface, the sensitivity for detecting crack defects on the roll body surface is extremely high. Since there are many materials used for cold and hot rolls, there are mainly high-speed steel, semi-high-speed steel, composite cast steel, high-chromium cast iron, infinite chilled high-nickel-chromium cast iron, forged steel and other materials, and each manufacturer has different materials for different materials. There are differences in alloying element content and tissue composition. Therefore, ...

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