To improve the service life of a cutting edge while reducing damage to the cutting edge in cutting a ring material while rotating it.
In a method of cutting the ring material, a first cutting process is carried out by moving the ring material W to be cut, forward toward the cutting edge 21 while rotating the ring material W, and stopping the rotation of the ring material W after slitting the whole periphery with the cutting edge 21 leaving only a preset dimension out of the thickness of the ring material W. A second cutting process is carried out by stopping the forward movement of the ring material W after moving the ring material W forward and slitting the ring material W until cutting through only a part of the ring material W, then moving the ring material W backward and rotating the ring material W again to position the remaining uncut part U into a cutting position, and stopping rotation. The whole periphery of the remaining uncut part U is cut by repeating the second cutting process. Consequently, since cutting conditions do not notably change when cutting through, a large force is not applied to one tooth of the cutting edge 21, which results in preventing damage to the cutting edge 21.
| JP2002283136A | 2002-10-03 | |||
| JP2002066835A | 2002-03-05 | |||
| JPH0325786U | 1991-03-15 |
Iwa Saki Kokuni
Akira Kurihara
Kawamata Sumio
Masakazu Ito
Shunichi Takahashi
Toshio Takamatsu