PIN MIRROR CUTTER AND THROW-AWAY TIP FITTED TO THE CUTTER

摘要

Cutting resistance is reduced effectively, the strength of a cutter body is kept high, and manufacture is facilitated. The deflection precision of cutting edges is kept high, without causing the cutter body to deviate in an axial direction with respect to an adaptor even due to the load and cutting heat in a thrust direction. Therefore, cutting edges are formed at the intersecting ridgeline parts between a pair of oppositely disposed long side faces 22 and 22 of a substantially trapezoidal flat-plate-shaped tip body 20 and upper and lower faces 21 and 21 of the tip body 20. A tip is mounted on a first tip mounting seat 13 formed in a peripheral face of the cutter body 10 such that a thickness direction of the tip body 20 is approximately aligned with a radial direction of the cutter body 10 to provide curved edges 25A formed in acute corner parts 24A of the tip body 20 for cutting. The tip is mounted on a second tip mounting seat 14 formed in an end face 12A (12B) of the cutter body 10 such that the thickness direction of the tip body 20 is approximately aligned with the direction of an axis O of the cutter body 10 to provide curved edges 25A formed in obtuse corner parts 24B of the tip body 20 for cutting.