About the Grinding of Gear Hob’s Rake Face

Author:

Hodgyai Norbert1,Drăgoi Mircea Viorel2,Tolvaly-Roşca Ferenc3,Máté Márton3

Affiliation:

1. „Transilvania” University of Brașov , Doctoral School , Brașov , Romania

2. „Transilvania” University of Brasov , Faculty of Manufacturing engineering and Production Management , Brașov , Romania

3. Sapientia Hungarian University of Transylvania , Faculty of Technical and Human Sciences, Department of Mechanical Engineering , Tîrgu-Mureș , Romania

Abstract

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.

Publisher

Muszaki Tudomanyos Kozlemenyek

Subject

General Arts and Humanities

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