Patent ID: 7908897

Claim:
A spline rolling tool for rolling splines on an outer circumferential surface of a workpiece, comprising: an elongated rectangular parallelepiped body having a toothed forming face with which the workpiece is to be brought into rolling contact at the outer circumferential surface thereof; and a plurality of forming teeth which are provided on said toothed forming face, and which are to bite into the outer circumferential surface of the workpiece so as to roll the splines on the outer circumferential surface of the workpiece, wherein said forming teeth are arranged in a longitudinal direction of said elongated rectangular parallelepiped body, wherein each of said forming teeth has an incomplete toothed region located in one of two end portions of each of said forming teeth where the two end portions are opposite to each other in a width direction of said elongated rectangular parallelepiped body, wherein a crest of each of said forming teeth is removed in said incomplete toothed region such that an upper end of each of said forming teeth in said incomplete toothed region is defined by an incomplete-toothed region surface that includes (a) a curved surface portion contiguous to a widthwise end surface of said elongated rectangular parallelepiped body and having an arcuate shape in a cross section that is perpendicular to said longitudinal direction, (b) a flat surface portion having a first end and a second end, wherein the first end is contiguous to said curved surface portion and substantially parallel to said crest of each of said forming teeth, and (c) a slant surface portion contiguous to the second end of said flat surface portion and inclined upwardly toward another one of said two end portions of each of said forming teeth, and wherein said incomplete-toothed region surface has a chamfered edge throughout a periphery thereof where said chamfered edge has a surface roughness of not larger than about 3.2 μm.