US 4,865,497 AGranted

Method for machining the flanks of gears by skiving and apparatus for implementing such method

AssigneeHermann Pfauter GmbH & Co.

InventorIngo Faulstich

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Abstract

The method is used for machining flanks of unhardened or hardened, spur-toothed or helical-toothed, internally toothed or externally toothed cylindrical gears by skiving. Basic rotation is produced between a tool and a workpiece. In addition, a helical motion between the tool and the workpiece is produced. The relative motion between the tool and the workpiece is executed with high accuracy, and any variations in the relative motion are corrected. The tooth number z.sub.0 of the tool, for minimizing the effect of the variations of the tool and its mounting, is fixed in such a way that, in the case of z.sub.0 .gtoreq.z.sub.2 (z.sub.2 is the tooth number of the workpiece, z.sub.0 is the tooth number of the skiving tool), the ratio i=z.sub.0 /z.sub.2, and in the case of z.sub.0 >z.sub.2, the reciprocal of the ratio 1/i=z.sub.2 /z.sub.0, result in an integral value or the ratio of two integral numbers, the amount of which is as small as possible.

Claims16

Dependent claims

A method of machining a workpiece by a tool by skivins, with said workpieces comprising flanks of cylindrical gears which can be hardened or unhardened, square or helical-toothed, and externally or internally-toothed, comprising the steps of:

(a) mounting said workpiece on a supporting means for rotation about the axis of said supporting means;
(b) mounting said tool on a tool supporting means for rotation about the axis of said tool supporting means;
(c) positioning and arranging said workpiece supporting means and said tool supporting means so that said axis are in planes which intersect each other during the process of machining the workpiece;
(d) producing through a series of gears a basic rotation of said tool and said workpiece about their respective axes;
(e) producing a relative helical motion between said tool and workpiece to obtain the desired gear depth in the workpiece;
(f) correcting during the machining process variations in the relative motion transmitted between said workpiece and said tool;
(g) wherein, where z.sub.0 is the tool tooth number and z.sub.2 the workpiece tooth number, the tool tooth number z.sub.0, in order to minimize the effect of the variations of the tool and its mounting, is designed in such a way that, in the case of z.sub.0 .gtoreq.z.sub.2, the transmission ratio i=z.sub.0 /z.sub.2 and, in the case of z.sub.0 .ltoreq.z.sub.2, the reciprocal of the transmission ratio 1/i=z.sub.2 z.sub.0 result in an integer or a ratio of two small integers, respectively.

4 more elements

Apparatus for machining a workpiece by skiving wherein the workpiece comprises flanks of cylindrical gears, comprising:

(a) a machine bed;
(b) an axial slide member mounted on said bed for movement in an axial direction relative to the workpiece to be machined;
(c) a tool spindle mounted on said axial slide member, and a tool carried by said spindle for rotation about the axis of said spindle;
(d) a workpiece spindle mounted on said bed, said workpiece carried by said spindle for rotation about the axis of said spindle;
(e) the axes of said spindles being arranged skewed during the machining of the workpiece;
(f) means for rotating said tool and workpiece;
(g) means for producing a helical motion in one of said tool and workpiece to develop gearing of the desired width in said workpiece;
(h) means for correcting transmission variations occurring in the relative motion between said workpiece and said tool, and
(i) wherein, where z.sub.0 is the tool tooth number and z.sub.2 the workpiece tooth number, the tool tooth number z.sub.0, in order to minimize the effect of the variations of the tool and its mounting, is fixed in such a way that, in the case of z.sub.2 ]z.sub.0 .gtoreq.z.sub.2, the transmission ratio i=z.sub.0 /z.sub.2 and, in the case of z.sub.0 .ltoreq.z.sub.2, the reciprocal of the transmission ratio 1/i=z.sub.2 /z.sub.0 result in an integer or a ratio of two integers, respectively.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/908,204Filed 17 Sep 1986
Priority: DE 353306417 Sep 1985
Granted: 12 Sep 1989
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B23F 23/10
Accessories or equipment combined with or arranged in, or specially designed to form part of, gear-cutting machines: arrangements for compensating…
B23F 5/163
The tool having a shape similar to that of a spur wheel or part thereof: the tool and workpiece being in crossed axis arrangement, e.g. skiving,…
Y10T 409/101749
Hobbing: process
Y10T 409/109381
Using reciprocating or oscillating cutter: including circumferentially disposed cutting edges