Wegwerf-Schneidplatte und Wegwerf-Schneidvorrichtung

摘要

The invention is designed to improve a cutting performance and a spiral chip discharging ability. Main cutting edges 16 and auxiliary cutting edges 18 are formed along the respective sides of an upper surface 14 of a negative throw-away tip 12 and along side of bevelled corners, respectively. A rake face 22 of each main cutting edge 16 is gradually inclined toward a lower surface of the tip 12 by an angle of inclination beta along the extension of the main cutting edge 16 away from its adjacent auxiliary cutting edge 18 and by a rake angle alpha (> beta ) along a direction perpendicular to the main cutting edge 16. The tip 12 is mounted on a cutter 9 as a rotatable cutting tool so as to discharge spiral chips during cutting. To this end, the tip 12 is mounted such that an axial rake angle, a corner angle, an angle of inclination, and a true rake angle are set in a range of -4 DEG to -10 DEG , a range of 25 DEG to 60 DEG , a range of 0 DEG or larger, and a range of -20 DEG to -5 DEG , respectively.