Method for the manufacture of a workpiece having a corrected gear tooth geometry and/or a modified surface structure

Patent metadata

Field	Value
Publication number	US-10286469-B2
Application number	US-201615005751-A
Country	US
Kind code	B2
Filing date	Jan 25, 2016
Priority date	Jan 23, 2015
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

A method for production of a workpiece having a corrected gear tooth geometry and/or a modified surface structure by a diagonal generating method with a modified tool, wherein a modification in the generating pattern has a constant value in a first direction of the tool and is given by a function F Ft1 in a second direction of the tool, which extends perpendicular to the first direction, and/or wherein the modification is produced in that the position of the dresser to the tool is varied during dressing in dependence on the angle of rotation of the tool and/or on the tool width position, wherein the modification of the tool produces a corresponding modification on the surface of the workpiece, and wherein the modification of the workpiece produced by the modification is superposed by a profile modification and/or a modification caused by a change of the machine kinematics during the machining process.

First claim

The invention claimed is:

1. A method for production of a workpiece having a corrected gear tooth geometry by a diagonal generating method by means of a modified tool, wherein a modification of a surface geometry of the tool is produced, wherein at least one of the modification in a generating pattern has a constant value at least locally in a first direction of the tool and is given by a function F Ft1 in a second direction of the tool which extends perpendicular to the first direction, and the modification is produced in that a position of a dresser to the tool is varied during dressing in dependence on an angle of rotation of the tool, wherein the modification of the surface geometry of the tool by the diagonal generating method produces a corresponding first modification on the surface of the workpiece, wherein the first modification on a surface of the workpiece is superposed by at least one of a second modification comprising a profile modification, and a third modification caused by a change of machine kinematics during a machining process, wherein at least one of a shape, a portion, and a direction of at least one of the first modification, the second modification, and the third modification is determined by curve fitting.

2. The method in accordance with claim 1 , wherein a desired modification of a surface geometry of the workpiece is predefined, and the modification of the surface geometry of the tool is determined on the basis of the desired modification of the surface geometry of the workpiece which produces a modification on the surface of the workpiece by the diagonal generating method, wherein at least one of a shape of the modification of the surface geometry of the tool, one or more parameters of the machining process, and one or more parameters of macrogeometry of the tool is determined by the curve fitting.

3. The method in accordance with claim 2 , wherein at least one of the shape of the modification of the surface geometry of the tool, a diagonal ratio, an axial cross angle during the diagonal generating method, a conical angle, and a profile angle of the tool are determined, wherein at least one of a diagonal ratio constant over a tool width is determined as a non-constant function of a feed position, the diagonal ratio is determined as a non-constant function of the feed position, the modification of the surface geometry of the tool has a constant value in the generating pattern in the first direction of the tool and is given by the function F Ft1 in the second direction of the tool which is perpendicular to the first direction, and the modification is produced in that the position of the dresser to the tool during dressing is varied in dependence on the angle of rotation of the tool.

4. The method in accordance with claim 3 , wherein at least two different modifications which can be produced by a modification of at least one of the dressing process of the tool, the dresser used for dressing the tool, and the machining process of the workpiece are superposed for the production of the workpiece, wherein the desired modification of the surface geometry of the workpiece is resolved by the curve fitting in at least two different modifications of the workpiece.

5. The method in accordance with claim 4 , wherein, from the modifications of the workpiece determined in this manner, the modification of at least one of the dressing process of the tool, the dresser used for dressing the tool, and the machining process of the workpiece are determined which are required for their production.

6. The method in accordance with claim 1 , wherein at least two of the following modifications are superposed onto the workpiece:
a first modification of the surface of the workpiece which is produced by the modification of the surface geometry of the tool which is in turn produced in that the position of the dresser to the tool is varied during the dressing in dependence on the angle of rotation of the tool, which has a constant value in the generating pattern at least locally in a first direction of the workpiece and is given by a function F Ft2 in a second direction of the workpiece,
a second modification of the surface of the workpiece which is produced by a profile modification of the dresser, and
a third modification of the surface of the workpiece which is produced by a change of the machine kinematics during the machining process of the workpiece,
wherein at least one of a shape, a portion, and a direction of the at least one of the first modification, the second modification, and the third modification is determined by the curve fitting in which a predefined, desired modification is resolved by at least two of the following modifications:
a first modification which has a constant value at least locally in the generating pattern in the first direction of the workpiece and is given by the function F Ft2 in the second direction of the workpiece which extends perpendicular to the first direction,
a second modification which is given by a pure profile modification, and
a third modification which has a constant value at least locally in the generating pattern in a third direction of the workpiece and is given by a function F KFt in a fourth direction of the workpiece which extends perpendicular to the third direction.

7. The method in accordance with claim 1 , wherein a desired modification of the workpiece is predefined and at least one or more of the machining process, macrogeometry of the tool, the modification of the surface geometry of the tool, and a combination of modifications are determined by means of the curve fitting which optimally approximates the desired modification of the workpiece, or produces it exactly, wherein the desired modification of the workpiece is predefined as at least one of a continuous function and a scatter plot, wherein the scatter plot spans a surface on a tooth flank, wherein a shape of the desired modification of the surface geometry of the workpiece is determined at a plurality of points or as continuous functions.

8. The method in accordance with claim 7 , further comprising a method for determination of the combination of modifications required for the production of a workpiece having a desired modification of at least one of the gear tooth geometry and a surface structure, wherein the modification of the surface geometry of the tool which has a constant value in the generating pattern in the first direction of the tool and is given by the function F Ft1 in the second direction of the tool which extends perpendicular to the first direction is superposed with at least one of the profile modification and the modification caused by the change of the machine kinematics during the machining process, wherein the desired modification is predefined and the combination of modifications is determined by means of the curve fitting which optimally approximates or exactly produces the desired modification, wherein the predefined, desired modification is resolved by at least two of the following modifications:
a first modification of the surface geometry of the workpiece which can be produced by modification of the tool during dressing and which has a constant value at least locally in the generating pattern in a first direction of the workpiece and is given by a function F Ft2 in a second direction of the workpiece which extends perpendicular to the first direction,
a second pure profile modification which can be produced by a shape of the dresser, and
a third modification which can be produced by the change of the machine kinematics during the machining process and which has a constant value in the generating pattern in a third direction of the workpiece and is given by a function F KFt in a fourth direction of the workpiece which ex

Assignees

• Liebherr Verzahntech Gmbh

Inventors

• Wuerfel Robert

Classifications

• B65G2811/0626

  Orientation of articles · CPC title

• G05B2219/35035

  Design gear, tooth surfaces · CPC title

• B23F9/02

  by grinding · CPC title

• B65G23/22

  Arrangements or mountings of driving motors {(B65G23/08 takes precedence)} · CPC title

• B23F5/04

  the tool being a grinding worm · CPC title