Skiving cutter

Abstract

A skiving cutter includes a cutting edge portion in which a tooth trace extends in a direction inclined with respect to an axis of a base. The cutting edge portion is segmented into a plurality of segmented cutting edges by cutting edge grooves extending in a direction intersecting the tooth trace. A helix angle is different according to positions of the plurality of segmented cutting edges.

1 . A skiving cutter comprising:
 a base having a circular cross-sectional shape perpendicular to an axis; and   a plurality of cutting edge portions protruding from an outer circumferential surface of the base, formed at intervals in a circumferential direction with respect to the axis, and having a tooth trace extending in a direction inclined with respect to the axis, wherein   each of the cutting edge portions is segmented into a plurality of segmented cutting edges by cutting edge grooves extending in a direction intersecting the tooth trace,   each of the segmented cutting edges includes an outer circumferential cutting edge which is an edge farthest away from the base among portions forming the segmented cutting edge, and   a helix angle which is an angle of the tooth trace with respect to the axis is different according to a position in the axial direction of the plurality of segmented cutting edges constituting the cutting edge portion.   
     
     
         2 . The skiving cutter according to  claim 1 , wherein the outer circumferential cutting edge of the segmented cutting edge having a helix angle of 10° or less is in a virtual plane perpendicular to the axis. 
     
     
         3 . The skiving cutter according to  claim 1 , wherein
 the outer circumferential cutting edge of the segmented cutting edge having the helix angle α larger than 10° is in a virtual plane perpendicular to the tooth trace.   
     
     
         4 . The skiving cutter according to  claim 1 , comprising
 a plurality of cutter pieces arranged in the axial direction, wherein   each of the cutter pieces includes:
 a segmented cutting edge row which is a collection of a plurality of segmented cutting edges having the same position in the axial direction as each other and arranged in the circumferential direction among the segmented cutting edges constituting each of the plurality of cutting edge portions; and 
 a segmented base formed as a portion of the base and including the segmented cutting edge row formed on an outer circumference thereof, and 
   the segmented bases are separable from each other, and   the skiving cutter further comprising:
 a positioning member which determines relative positions in the circumferential direction of the segmented cutting edges between the plurality of cutter pieces.