| 摘要 |
PURPOSE:To make it possible to minimize the production of burr and to allow a rotary cutting tool to perform stabilized cutting for a long time by arranging a plurality of cutting face at the cutting tool hold section formed radially to an axis with each of cutting faces twisted rightward and leftward and mounting chips capable of mounting and dismounting freely. CONSTITUTION:Four rake faces 14 ... are arranged radially to an axis on the side wall section of four chip pockets 13 of a tool holder section 12 with each of faces twisted rightward and leftward respectively. The chips 16, 16' ... capable of being mounted and dismounted freely to each of seats 15 are also mounted in slanted state torsionally rightward and leftward according to the angle of torsion. If the chip 16 torsionally slanted rightward cuts a material with a rotary cutting tool pressed to the end face of the material with the axis being approximately parallel, the burrs caused by cutting is discharged obliquelly upward, but since the next chip 16 torsionally slanted leftward discharges the burrs obliquelly downward, the production of the burr can be minimized. In addition, the service life of chip is prolonged. |
