Online crack detection device for roll for rolling, roll for rolling, and online crack detection method for roll for rolling

Abstract

Provided are a crack detection device that identifies occurrences of cracks and the progress of the cracks in the surface of the body part of a roll for rolling online and a roll for rolling providedwith the a crack detection function without having continuous disposition of many sensors on the roll for rolling and without having to make large modifications to a rolling device and the roll for rolling. The online crack detection device for the roll for rolling incorporated into a rolling device is characterized in that the roll for rolling has a body part and shaft parts extending from both ends of the body part as a unit, and the crack detection device is provided with the roll for rolling having, disposed on at least one shaft part, an AE sensor for detecting elastic waves generated onthe surface of the body part, and a calculation unit for calculating the characteristic quantities of the elastic waves detected by the AE sensor; and a discrimination unit for discriminating the elastic waves due to cracks occurring in the surface of the body part by the characteristic qualities.

Description

technical field [0001] The present invention relates to a technique for detecting crack defects existing on the surface of a rolling roll or directly below the surface by a sensor disposed on the rolling roll. In particular, it relates to the on-line detection of the surface, A crack detection device for cracks that develop and develop just below the surface, and a roll for rolling with a crack detection function. Background technique [0002] In the field of hot rolling of steel plates, sensors such as ultrasonic flaw detectors, eddy current flaw detectors, and acoustic emission (hereinafter referred to as AE) sensors have been developed to detect the existence of the surface of the trunk portion of the roll for rolling and / or directly below the trunk portion surface ( The following is a technique for cracking defects on the surface of the trunk. [0003] The background of the technology required to detect crack defects will be described. In the hot rolling process of st...

AI Technical Summary

Problems solved by technology

However, as described in Patent Document 3, the present inventors installed an AE sensor on the end of the shaft of the rolling roll and arranged the rolling roll in a rolling device, in order to detect the When detecting cracks, in rolling operations, the AE wave generated when the rolling roll pressurizes the steel plate becomes noise, and it is difficult to detect only the elastic wave accompanying the crack generated on the surface of the rolling roll

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