Shaping roll

Abstract

A shaping roll for forming a grinding wheel of a longitudinal-feed thread grinding machine used for the manufacture of threads including a conically tapered first thread portion and a cylindrical second thread portion includes a first groove having flank and radius configurations corresponding to the conically tapered first thread portion to be formed, a first cylindrical end surface adjacent the first groove and having a first diameter, a second groove having flank and radius configurations corresponding to the cylindrical thread portion to be formed, and a second cylindrical end surface adjacent the second groove and having a second diameter. The depth of the first groove is less than the depth of the second groove. The bottoms of the first and second grooves are spaced by an axial distance equal to an integral multiple of the pitch of the thread to be formed less an amount equal to the pitch distortion of the thread to be formed at the area of transition between the last thread of the concally tapered first thread portion and the cylindrical second thread portion. The first diameter of the first cylindrical end surface is greater than the second diameter of the second cylindrical end surface. An intermediate cylindrical surface is positioned axially between the first and second grooves and has a diameter less than the first diameter and greater than the second diameter.

Dependencies are inferred from the claim text.