Gear Hob Base Worm Modelling from a Straight Toothed Generating Rack

Hodgyai, Norbert and Viorel-Dragoi, Mircea and Máté, Márton (2024) Gear Hob Base Worm Modelling from a Straight Toothed Generating Rack. MŰSZAKI TUDOMÁNYOS KÖZLEMÉNYEK (EN), 20. pp. 24-29. ISSN 2601-5773

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Abstract

The precision of a gear realized by hobbing is mainly influenced by the precision of the base worm, the ade quate form of the rake face and the number of resharpenings. Gearing theory states that the base worm of a gear hob must be of involute type. Despite of this, manufacturing technology often admits a convolute worm as gear hob base worm. Due to the rake face grinding technology, there appears a difference between the theoretical and the real surface. On the other hand, the profile modification of the cutting edges occurs due to the re-sharpening. As a result, the cutting edges cannot reproduce that initial basic worm surface from which the gear hob was derived. In our opinion, the computing of the generating surfaces of the basic worm is still an unsolved problem. This paper deals with the study of a worm derived from a straight toothed generating rack. The incidence of an involute worm and that developed from the generating rack is investigated.

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