CIRCULAR SAW Russian patent published in 2009 - IPC B23D61/02 

FIELD: mechanics.

SUBSTANCE: saw consists of solid body with cutting teeth located along the outline, each of which has back clearance angle and negative rake angle. At that, teeth in plane perpendicular to saw axis are made in the form of a wedge. In order to improve cutting quality by minimising the number of burrs on pipe ends, to increase capacity and life of saw, the main cutting edge of tooth is made in the form of an arc with cutting edge angle at cutting edge point, which equals to 60° - 65°. At that, back clearance angle at cutting point has positive value of 0.5°- 1°, and front clearance angle at cutting point has negative value of (-55°) - (-45°) depending on the grade of cut metal and cutting speed.

EFFECT: improvement of cutting quality.

3 dwg, 1 tbl