Method and apparatus for gear skiving

Patent metadata

Field	Value
Publication number	US-11059116-B2
Application number	US-201816126792-A
Country	US
Kind code	B2
Filing date	Sep 10, 2018
Priority date	Sep 8, 2017
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

The present disclosure relates to a method for gear skiving a workpiece, wherein: in a first step, the geometry of a tool, in particular of a skiving wheel, is measured for the machining of the workpiece in a state clamped in an apparatus for gear skiving machining; and in a subsequent further step, machining kinematics are determined for the gear skiving in dependence on the measured geometry of the tool characterized in that the absolute location of a cutting edge of the tool in the apparatus is determined in the first step.

First claim

The invention claimed is:

1. A method for skiving a gear workpiece, wherein:
in a first step, one or more geometrical parameters of a geometry of a tool are measured for machining of a gear workpiece, where the tool is in a clamped state in a gear machining apparatus,
the gear machining apparatus comprising a machining head, a tool mount, and a machine table, wherein the tool is mounted on the machining head via the tool mount, and wherein the gear workpiece is mounted on the machine table; and
in a subsequent further step, machining kinematics are determined for the skiving of the gear workpiece in dependence on the measured one or more geometrical parameters of the geometry of the tool,
wherein determining the machining kinematics includes determining machining kinematics parameters, the machining kinematics parameters including one or more of a coupling position, a center distance, an axial cross angle, and a rake face offset parameters, and
wherein a location of a cutting edge of the tool is determined in the first step, based on a position of the tool in the tool mount in the gear machining apparatus.

2. The method in accordance with claim 1 , wherein a spatial extent of the cutting edge is determined in the first step in addition to determination of the location in the first step, and wherein the spatial extent of the cutting edge is based on where a z axis coincides with an axis of rotation of the tool and with a tool spindle axis during machining.

3. The method in accordance with claim 1 , wherein the tool is a skiving wheel and wherein the one or more geometrical parameters are measured at the skiving wheel, the one or more geometrical parameters including one or more of
a) an outside diameter of the skiving wheel at one or more axial positions of the skiving wheel, wherein the one or more axial positions of the skiving wheel are based on one or more of a spatial distance of the cutting edge relative to contact of the skiving wheel on the tool mount and a movement of the machining head relative to the workpiece;
b) a tooth thickness of the skiving wheel at the one or more axial positions of the skiving wheel;
c) a profile line of the skiving wheel;
d) a tooth trace of the skiving wheel;
e) an extent of the cutting edge of the skiving wheel;
f) a location of a rake face and/or an orientation of the rake face; and/or
g) a location of the skiving wheel.

4. The method in accordance with claim 3 , wherein a deviation in the tooth thickness of the skiving wheel, in a profile angle of the skiving wheel, and/or in a root radius of the skiving wheel from a desired geometry or from a desired location in the apparatus is compensated by the machining kinematics, and/or wherein an angular location of a skived gap is directly predefined in the gear workpiece.

5. The method in accordance with claim 3 , wherein the machining kinematics are determined and/or corrected in dependence on the measured one or more geometrical parameters of the skiving wheel and remain constant during a machining stroke.

6. The method of claim 3 , wherein the location of the rake face and/or the orientation of the rake face includes a rake angle of the rake face and a step angle of the rake face.

7. The method of claim 3 , wherein the skiving wheel is located on a spindle having an axis, and wherein the location of the skiving wheel includes a rotational position of the skiving wheel with respect to the skiving wheel spindle axis.

8. The method of claim 3 , wherein the skiving wheel is located on a spindle having an axis, and wherein the location of the skiving wheel includes a rotational position of one or more teeth on the skiving wheel with respect to the skiving wheel spindle axis.

9. The method in accordance with claim 1 , wherein the machining kinematics are determined and/or corrected in dependence on the measured one or more geometrical parameters of the tool and on an axial feed position of the gear workpiece, and wherein the axial feed position of the gear workpiece is substantially parallel to an axis of rotation of the tool.

10. The method in accordance with claim 1 , wherein the machining kinematics are determined and/or corrected in dependence on the measured one or more geometrical parameters of the tool and remain constant during a machining stroke.

11. The method in accordance with claim 1 , wherein an evaluation is made via a check, wherein the evaluation via the check determines whether a predefined production tolerance is observed with a skiving wheel and the machining kinematics and/or whether technological parameters are within a predefined range, wherein corresponding workflows are output by a machine in dependence on a result of the check, and wherein the check includes performing a simulation and calculating values for gear teeth from measurement results that are based on sensor output.

Assignees

• Liebherr Verzahntech Gmbh

Inventors

• Würfel Robert

Classifications

• B23F23/003

  Generating mechanisms · CPC title

• B23F5/163 Primary

  the tool and workpiece being in crossed axis arrangement, e.g. skiving, i.e. "Waelzschaelen" · CPC title

• G05B2219/45214

  Gear cutting · CPC title

• G01B5/24

  for measuring angles or tapers; for testing the alignment of axes · CPC title

• B23F23/1218

  Checking devices for controlling workpieces in machines for manufacturing gear teeth · CPC title