Method for finishing gears via skiving

In a method for, via skiving, finishing with a toothed skiving cutter-tool carried on an axial carriage the flanks of the teeth of a cylinder wheel workpiece that is provided with internal or external spur or helical gearing, wherein the right and left flanks of the teeth are generated in separate operations and wherein said workpiece and said tool perform two motions, namely a basic rotation, at which the ratio of the rotational speeds of said workpiece and said tool is equal to the inverse ratio of the respective numbers of the teeth of said workpiece and said tool, and a helical movement, which consists of a displacement of said tool in the direction of the axis of said workpiece and an additional rotation of said workpiece proportional to said displacement and, to produce conventional helix modifications, such as tooth crowning, and/or end relief, the pertaining apparatus, depending on the movement of said axial carriage thereof, alters the center distance between said tool and said workpiece, and/or alters said additional rotation of said workpiece relative to said tool, the improvement including the steps of:

• during said axial movement, automatically altering relative to said conventionally performed alterations at the same time one of swivel angle, offset of said tool, center distance, and a combination of said setting parameters to generate a profile slope deviation depending on the respective transverse plane;
• automatically altering at the same time at least one of additional rotation and center distance to compensate for the effect of said measures on the desired helix modification and iteratively determining quantitatively the required alterations to simultaneously achieve a desired distortion of the flanks and the desired helix modification;
• and
• using a tool for the finishing that is designed in such a way that the profile in a profile reference section compensates for the profile deviation that has to be expected according to the setting conditions that are effective when generating the profile in this area.