Relieving the teeth of hobs for cutting the Wildhaber-Novikov gears

Abstract

Screw and relieved surfaces with a profile of substantial and variable curvature are often used in machine parts and cutting tools. Among them, a special place is occupied by worm hobs for cutting the teeth of Wildhaber-Novikov gears with the profile of the generating worm, variable not only in radius, but also in sign of curvature. A technique for forming the tooth flanks of these hobs by a disk grinding wheel is developed, which allows the grinding and ground profiles in the axial section of the generating worm to be brought together as close as possible. The method for calculating the settings-up and profile coordinates of the grinding wheel is given for its performance in real production conditions.