Werkzeugmaschinenfabrik Oerlikon-buhrle Ag

Oerlikon Geartec Ag

Hermann Stadtfeld

Manfred Knaden

Gerhard Brandner

At the gear manufacturing machine there are automatically fabricated longitudinally curved tooth gears, especially longitudinally curved tooth bevel and hypoid gears according to conventional stock-removal form or generating methods. In order to improve both the mechanical stability and kinematic stability, the gear manufacturing machine contains only so-to-speak 'natural' gear manufacturing or cutting axes, and, in particular, does not contain any hypoid stock, however, a generating drum. With the method of operating such gear manufacturing machine it is possible to fabricate hypoid gears during the generating operation by performing an additional movement of the workpiece in the lengthwise direction of the tooth pitch cone.

Apparatus and method for manufacturing longitudinally curved tooth gears

For manufacturing a pinion of a pair of mating bevel gears having contact-line tooth bearing or crowning in accordance with the method developed by Litvin et al, the cutter radii of respective outer and inner blade edges in the duplex or double-cut method and therewith the centers of rotation of the cutter heads as well as the center of rotation of a generating gear are altered in relation to the settings for manufacturing the mating or meshing gear. This would require cutter heads provided with adjustable cutter radii. In order to render possible the use of commercially available cutter heads, provision is made for achieving the alternation of the cutter radii by inclination of the cutter-head axes.

Duplex method of manufacturing a generated spiral-toothed bevel gear of

The position-reading system for machine-tool parts rotatable through 360.degree. renders possible accurate position determination by using a scale although there is present a measuring gap. This is achieved by the use of two reading units angularly offset at a predetermined angle with respect to one another and by the use of an indicating unit which contains evalution and switch-over means. These evaluation and switch-over means evalute the output signals of the two reading units and switch, on the one hand, one reading unit, upon passage thereat of the measuring gap, to become position-reading inactive and, on the other hand, the other reading unit to become position-reading active, such other reading unit taking over the corresponding momentary position value or reading.

Position-reading system with switchable reading units for machine-tool

In addition to a generating drum, by means of which gear wheels to be maufactured according to the generating method are produced, the gear-cutting machine also comprises setting drums, particularly an eccentric drum, an orientation drum and an inclination drum. Prior to commencing the gear-cutting operation to produce a gear wheel by means of a cutter head, these three setting drums are rotated into the respective required position by means of the adjusting apparatus constructed according to the invention. This adjusting apparatus comprises a computer for controlling the setting of the drums and a locking device controllable by the computer for locking or securing one setting drum at the cutter head. Furthermore, there is provided an automatic position-reading device for transmitting the setting of the drums to the computer, as well as a device controllable by the computer for actuating clamping devices of the respective setting drums. 1

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Dielsdorf, Switzerland

Hermann Stadtfeld