To perform setting efficiently and accurately without imposing a burden on a working posture, when forming a groove by performing a gas cutting of an outer circumferential surface of a ring-shaped cut material, and also perform cut slag removal in a short time.
An apparatus of the present invention is equipped with: a rotating table 11 and a rotary drive 12 of the rotating table 11; a chuck 13 mounted coaxially with the rotating table 11 on the surface side of the rotating table 11; and a gas cutting machine 14 with a torch 14a, which is disposed so as to inject a preheating flame and oxygen for cutting toward an outer circumferential surface of a cut material 5 held from an inner circumferential side, while being floated from the rotating table 11 by the chuck 13. By using the apparatus, the gas cutting is performed by injecting the preheating flame and oxygen for cutting, while rotating the cut material 5 held in a state to be floated from the rotating table 11 by using a ring-shaped center as a fulcrum shaft.
IDETA TAKESHI
Yoshinori Iwahara
Susumu Yamamoto
Kazuhiro Emura
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