Abstract
Worm hobs for cutting Novikov gears have the profile of a generating worm, which varies not only in a radius, but also in a sign of curvature. A technique for relieving tooth flanks of these hobs by disk grinding wheel is developed. It allows for bringing together grinding and ground profiles in an axial section of the generating worm as close as possible. A method for calculating setting-ups and profile coordinates of the grinding wheel is given for real production conditions.
Highlights
Formation of screw and relieved surfaces by disk grinding wheels includes inevitable deviation of ground surface and wheel profiles
An axial profile of the grinding wheel was set in the form of a circle arc, and an angle of installation of the grinding wheel axis and an axial profile of a worm thread were sought based on the condition that this arc was a contact line of the wheel and the ground surface
In [1, 2] it was shown that the discrepancy between the profiles of the grinding wheel surface and the hob tooth flank to be ground will be minimal if in the vicinity of the calculated contact point, the line of their contact will not be crossing the axial section of the hob, but touching it
Summary
Formation of screw and relieved surfaces by disk grinding wheels includes inevitable deviation of ground surface and wheel profiles. It solved the main issues of relieving technique that are functionally oriented for solving the following problems: providing rear angles of the teeth necessary for the wear resistance of cutting edges of a hob, minimizing the organic error of a profile of a generating rack, determining the main parameters for setting up a relieving machine and profile of a grinding circle. At present, basic racks are standardized and widely used in production with a full tooth profile, which provide in gears two lines of action and allow for cutting the pinion and the wheel by one worm hob [9].
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