Abrading – Precision device or process - or with condition responsive... – Computer controlled
Patent
1997-11-05
2000-03-07
Eley, Timothy V.
Abrading
Precision device or process - or with condition responsive...
Computer controlled
451 47, 451161, 451 57, B24B 4900
Patent
active
060332875
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The invention relates to a method for finishing the hardened gear teeth of a bevel gear by grinding following hardening and subsequent fine-machining of the ground gear teeth, to a machine for executing the method, and to the method of using a bevel gear with hardened and fine-machined gear teeth by being paired with a second bevel gear having gear teeth which have only been finished by grinding following hardening or having gear teeth which have also been fine-machined.
2. Background Art
It was possible to achieve very great accuracies in the production, along with tolerable processing times, by grinding bevel gears with spiral teeth. The great accuracies have an advantageous effect on the kinematic accuracy of the gears and on their load-carrying ability. It is also possible to achieve improvements in noise reduction by the optimal design of the bearing pattern (ease-off topology). This applies to the conventional construction of gears, in particular to manufacturing gears for trains, trucks and buses.
A high degree of noise reduction is achieved in passenger car gears with offset axles (so-called hypoid gears) by means of conventional bevel gear manufacturing, i.e. by milling, hardening and lapping of the gear teeth. Hypoid wheels for passenger cars are generally distinguished by a very large axle offset. This results in a very high sliding speed over the entire flank area, which is especially advantageous for the lapping process. Furthermore, passenger car gears are produced in very large numbers, so that it is possible to optimize the process. It is therefore understandable that by means of the conventional production by milling, hardening and lapping a noise standard has been achieved today with these gears, which up to now had been difficult to attain in production line manufacturing of such gears by the grinding process.
In accordance with EP 0 229 894 B1, a known process of hypoid gear manufacturing which has proven itself economically and qualitatively, comprises gear cutting by milling or cutting, case-hardening and lapping in batches. In this case a gear set generally consists of respectively a pinion gear and a ring gear, which must be identified in pairs during lapping for subsequent mounting. The unavoidable distortion during hardening and the resultant loss in quality always cause difficulties here. Even though individual contact errors are rectified by lapping in pairs in order to improve quiet running of the gear sets in addition to improving the surfaces of the sides of the teeth, concentricity errors and eccentricity remain. If such concentricity errors and eccentricity cannot be tolerated, other fine-machining processes must be employed, for which numerous examples are recited in EP 0 229 894 B1. Thus, during large production line manufacturing of gears, in particular for passenger cars and trucks, spur gears, for example, are mainly shaved and subsequently hardened following soft milling (pre-cutting of gears). The quality achieved with this is sufficient to meet the requirements, because the distortion during the hardening of spur gears is small. Bevel gears with spiral teeth are produced as indicated above and are mounted in pairs. However, the fixed pairing of the pinion and the ring gear of the bevel gear sets is to be omitted to increase efficiency, i.e. the distortion due to hardening must be eliminated in the course of fine-machining or finishing of the gear teeth. To this end, EP 0 229 894 B1 discloses a continuous grinding process, by means of which the efficiency as well as additionally the quality of bevel gears is advantageously affected, in that the effects of the distortion due to hardening, as well as contact and concentricity errors and eccentricity, are eliminated to a great extent, so that the identification of pairs of pinions and ring gears and their storage can be omitted. But the very high noise standard which can be achieved in the course of the conventional bevel gear production described at the outset by means of milling, harden
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"Spiralkegelrad-Walzschleifmaschine WNC 30", Oerlikon Geartec AG, Switzerland.
"CNC-Controlled Spiral Bevel Gear Grinding Machine WNC 80", Klingelngerb Sohne, Germany.
Russeler Gerhard
Wiener Dieter
Eley Timothy V.
Klingelnberg Sohne GmbH
Nguyen Dung Van
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