Abrading – Abrading process – Gear or worm abrading
Patent
1997-11-05
2000-04-18
Eley, Timothy V.
Abrading
Abrading process
Gear or worm abrading
451 57, 451 5, B24B 100
Patent
active
060508833
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The invention relates to a method of the type recited in the preamble of the claim.
2. Background Art
There are bevel gear teeth which are produced in a continuous indexing process and those which are produced with the two-axis method or intermittent indexing process. Since the demands on the gears in respect to load-bearing capacity, accuracy and quiet running have continuously increased in the past years, special production methods have been created which, in contrast to lapping after hardening, provide fine machining. There are essentially three basic forms of spiral-toothed bevel gears based on the differences in respect of the longitudinal line of tooth:
The manufacture of bevel gears with a circular arc as the longitudinal tooth line takes place by means of the intermittent indexing process while the manufacture of those with an involute or extended epicycloid as the longitudinal tooth line takes place in the continuous indexing process. Grinding methods using cone-shaped cup wheels have been developed in the past years for the fine machining of bevel gears, even of those having an epicycloidal longitudinal tooth line. Therefore the possibility also exists for grinding bevel gears, whose teeth have been precut with an epicycloidal longitudinal tooth line with circular arc shaped tools.
It is known that with the lead tooth formations for epicycloids and arcs of a circle being created in the course of tooth cutting, the differences between both longitudinal tooth lines are small and with suitable adaptation lie within the area of the overmeasure of fine machining.
Bevel gear teeth which are produced by means of modern continuous indexing methods, such as Spiroflex or Spirac of the Oerlikon company in Zurich, Switzerland, or Zyklo-Palloid of the Klingelnberg company of Huckeswagen, Germany, generally have such extended epicycloids as longitudinal tooth lines. Except for intended deviations, which are used for generating lengthwise tooth crowning, these teeth are congruent in the longitudinal tooth direction, i.e. the convex and concave flanks have the same radii at the tooth center, only with different signs. Single- or multi-thread face cutter heads are used for producing cyclo-palloid gear teeth. With cyclo-palloid gear teeth, the tooth depth is constant over the entire face width. It is known to differentiate between spiral bevel gear wheels with tapering teeth and those with teeth of equal depth. Regarding the profile height in the longitudinal flank direction, it is possible to produce both shapes by means of the above mentioned process, depending on the layout. In contrast thereto it is not possible in connection with the intermittent indexing processes to selectively realize the difference, which essentially relates to the production of the pitch, during production. While for commercial reasons the continuous indexing method is preferred for the involute and cycloid teeth, the production of bevel gears with circular arc gear teeth is only possible by means of the intermittent indexing process. In connection with bevel gears with spiral teeth which have a circular arc in the longitudinal tooth direction, a method of the Gleason company of Rochester, N.Y., USA, is mainly employed.
The system of tooth cutting employed by Oerlikon is based on constant tooth depth and the continuous indexing method. With the Oerlikon tooth cutting methods, the respectively required lengthwise tooth crowning is achieved by a tilted setting of the cutter head (also called "TILT" by one skilled in the art). With the Spiroflex method the ring gear and the pinion are rolled off on the generating plane gear, and with the Spirac method the ring gear is cut in, while the pinion teeth are produced by generation on the cone of the ring gear.
Also with the so-called Kurvex method of the Modul company (see DD Standard TGL 25644 and the company prospectus No. KB 6060/1972, Zahnrad-Walzfrasmaschinen fur kreisbogenverzahnte Kegelrader [Gearwheel Generating Milling Machines for Bevel Gears with Circula
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Eley Timothy V.
Klingelnberg Sohne GmbH
Nguyen Dung Van
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