METHOD AND APPARATUS FOR ULTRASONICALLY DETECTING FLAW ON SURFACE OF CIRCULAR CYLINDER, AND METHOD OF GRINDING ROLL UTILIZING THE SAME

Title:

METHOD AND APPARATUS FOR ULTRASONICALLY DETECTING FLAW ON SURFACE OF CIRCULAR CYLINDER, AND METHOD OF GRINDING ROLL UTILIZING THE SAME

Document Type and Number:

WIPO Patent Application WO/1999/023486

Kind Code:

A1

Abstract:

A method of ultrasonically detecting a flaw on the surface of a circular cylinder by using a surface wave, aiming at preventing the over-detection of primary cracks, reducing the level of noise from a grain boundary and improving the flaw detecting performance. Specifically, a method of ultrasonically detecting a flaw on a hot rolled product by using a surface wave, comprising providing a surface wave probe (10), which is adapted to transmit and receive the surface wave, with a resin wedge (10C) on an ultrasonic wave-receiving surface of an ultrasonic oscillator (10A), and a damping member (10B) on the rear surface of the supersonic oscillator (10A), generating short pulses the width of which is not more than 2.5 times as large as the wavelength of the surface wave, supplying a medium liquid in accordance with a peripheral speed of the roll, grinding the roll on the basis of a grinding volume determined in accordance with the height of a reflected wave, and determining an optimum level of the roll grinding volume by detecting a flaw while partially grinding the roll.

Inventors:

TAKADA HAJIME (JP)
SUGIMOTO RYOUICHI (JP)
MORII TAKASHI (JP)
YARITA IKUO (JP)

Application Number:

PCT/JP1998/004897

Publication Date:

May 14, 1999

Filing Date:

October 29, 1998

Export Citation:

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Assignee:

KAWASAKI STEEL CO (JP)
TAKADA HAJIME (JP)
SUGIMOTO RYOUICHI (JP)
MORII TAKASHI (JP)
YARITA IKUO (JP)

International Classes:

B24B5/36; B24B5/37; B24B27/033; B24B49/10; B24B49/12; G01N29/04; G01N29/22; G01N29/24; G01N29/26; G01N29/28; G01N29/40; G01N29/42; (IPC1-7): G01N29/04; B24B27/033

Foreign References:

JPH0273151A	1990-03-13
JPS60232858A	1985-11-19
JPS63255657A	1988-10-21
JPH07294493A	1995-11-10
JPH04276547A	1992-10-01

Other References: