About the Grinding of Gear Hob’s Rake Face

Hodgyai, Norbert and Dragoi, Mircea Viorel and Tolvaly-Roșca, Ferenc and Máté, Márton (2022) About the Grinding of Gear Hob’s Rake Face. Papers on Technical Science, 16. pp. 31-35. ISSN 2601-5773

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Abstract

The most simple and robust construction of the monolithic gear hobs present a common helical rake face for a given line of teeth, whose generatrix is a straight-line segment perpendicular to the hob’s axis while its directory is a helix, perpendicular to the pitch helix. As a consequence, constructive rake angles are zero on all edges. Total curvatures of such a surface are negative. Thus, it can be grinded only using the conical surface of a platter type grinding wheel, or a grinding bit. Despite this, some industry practices, possibly for reasons of simplicity and cost lowering, involve the plain grinding surface, supposed to a helical motion. This paper deals with the CAD-simulation of the grinding process using the plain wheel surface, and it shows the differences between the theoretical and rake face and the real obtained helical surface.

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