Method of producing a toothed workpiece having a modified surface geometry
AssigneeLiebherr-Verzahntechnik GmbH
InventorRobert WUERFEL
Life of this patent
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Abstract
In a method of producing a toothed workpiece having a modified surface geometry by a diagonal generating method by means of a modified tool, a tool may be used whose surface geometry comprises a modification which can be described at least approximately in the generating pattern at least locally in a first direction of the tool by a linear and/or quadratic function, with the specific modification of the tool producing a corresponding modification on the surface of the workpiece by the diagonal generating method, with the modification of the workpiece produced by the specific modification of the tool having a profile modification and/or a modification caused by a change of the machine kinematics during the machining process of the workpiece superposed on it.
Claims17
A method of producing a toothed workpiece having a modified surface geometry by a diagonal generating method by means of a modified tool, wherein a tool is used whose surface geometry comprises a modification which can be described at least approximately at least locally in the generating pattern in a first direction of the tool by a linear and/or quadratic function;
- wherein the coefficients of this linear and/or quadratic function are formed in a second direction of the tool which extends perpendicular to the first direction by coefficient functions FFtC,1, FFtL,1 and/or FFtQ,1 and/or a modification whose pitch and/or crowning varies in dependence on the angle of rotation of the tool and/or on the tool width position;
- and wherein the specific modification of the tool by the diagonal generating method produces a corresponding modification on the surface of the workpiece, wherein the modification of the workpiece produced by the specific modification of the tool is superposed by a profile modification and/or a modification caused by a change of the machine kinematics during the machining process of the workpiece.
A method of producing a toothed workpiece having a modified surface geometry by a diagonal generating method by means of a modified tool, wherein a tool is used whose surface geometry comprises a modification which can be described at least approximately at least locally in the generating pattern in a first direction of the tool by a linear and/or quadratic function;
- wherein the coefficients of this linear and/or quadratic function are formed in a second direction of the tool which extends perpendicular to the first direction by coefficient functions FFtL,1, FFtL,1 and/or FFtQ,1 and/or a modification whose pitch and/or crowning varies in dependence on the angle of rotation of the tool and/or on the tool width position;
- and wherein the specific modification of the tool by the diagonal generating method produces a corresponding modification on the surface of the workpiece, wherein the shape of the modification of the surface geometry of the tool and at least one parameter of the machining procedure of the workpiece and/or of the macrogeometry of the tool are determined such that a desired modification can be produced at least approximately, with the determination taking place by curve fitting and/or analytically.
A method of producing a toothed workpiece having a modified surface geometry by a diagonal generating method by means of a modified tool, wherein at least two different modifications which can be produced by a modification of the dressing process of the tool and/or of the dresser used for dressing the tool and/or of the machining process of the workpiece are superposed for the production of the modification of the workpiece;
- wherein a desired modification of the workpiece is specifiable in the generating pattern as a second degree polynomial in a rolling angle wF and in a workpiece width position zF, with at least one coefficient of the polynomial being freely selected within certain conditions;
- and/or wherein the desired modification of the workpiece is specifiable as a superposition of a plurality of crownings with directions freely selectable within certain conditions;
- and/or wherein a desired profile crowning and a desired tooth trace crowning are specifiable;
- and/or wherein the desired modification of the workpiece is specifiable as a waviness having an amplitude which has a non-constant value transversely to a direction of propagation of the waviness, with an amplitude function being specifiable which has at least a linear and/or quadratic shape transversely to the direction of propagation of the waviness and along the wave peaks, with one or more coefficients of the amplitude function being freely selectable at least within specific conditions;
- and/or wherein the amplitude is specifiable such that it varies in every flank direction of the tool.
A computer system and/or software program for the determination of the combination of modifications required for the production of a workpiece with a desired modification, having an input function for specifying a desired modification and having a resolving function;
- wherein the resolving function determines a combination of modifications which approximates the desired modification and/or determines it exactly;
- wherein the resolving function determines a combination suitable for this purpose of a modification of the workpiece which can be produced by a specific modification of the surface geometry of the tool which can be described at least approximately in the generating pattern at least locally in a first direction of the tool by a linear and/or quadratic function, with the coefficients of this linear and/or quadratic functions being formed in a second direction of the tool which extends perpendicular to the first direction by coefficient functions FFtC,1, FFtL,1 and/or FFtQ,1 and/or a modification whose pitch and/or crowning varies in dependence on the angle of rotation of the tool and/or on the tool width position with a profile modification and/or a modification caused by a change of the machine kinematics during the machining process, wherein the resolving function resolves a specified, desired modification of the workpiece by a curve fitting and/or analytically at least approximately into two different modifications of the workpiece which can each be produced by a modification of the dressing process of the tool and/or of the dresser used for the dressing of the tool and/or of the machining process of the workpiece;
- wherein further the resolving function resolves a specified desired modification at least approximately into at least two of the following modifications:
- a first modification which can be described at least approximately at least locally in a first direction of the workpiece by a linear and/or quadratic function, with the coefficients of this linear and/or quadratic function being formed in a second direction of the workpiece which extends perpendicular to the first direction by coefficient functions FFtC,2, FFtL,2 and/or FFtQ,2 and/or a modification whose pitch and/or crowning varies in dependence on the workpiece width position;
- a second modification which is given by a pure profile modification;
- and/or
- a third modification which has a constant value in the generating pattern at least locally in a third direction of the workpiece and is given by a function FKFt in a fourth direction of the workpiece which extends perpendicular to the third direction, and having a calculation function which determines the modification of the dressing process of the tool and/or of the dresser used for dressing the tool and/or of the machining process of the workpiece from the modifications of the workpiece and/or of the tool determined in this manner.
A computer system and/or software program for the determination of a combination of modifications required for the production of a workpiece with a desired modification, having a function for specifying a desired modification and having a determination function;
- wherein the determination function determines the shape of a specific modification of the surface geometry of the tool which can be described at least approximately in the generating pattern at least locally in a first direction of the tool by a linear and/or quadratic function, with the coefficients of this linear and/or quadratic function being formed in a second direction of the tool which extends perpendicular to the first direction by coefficient functions FFtC,1, FFtL,1 and/or FFtQ,1 and/or determines a modification whose pitch and/or crowning varies in dependence on the angle of rotation of the tool and/or on the tool width position;
- and at least one parameter of the macrogeometry of the tool and/or at least one parameter of a diagonal generating method by which the desired modification can be approximated and/or can be produced exactly, the functions stored in non-transitory memory and executable by a processor.
Dependencies are inferred from the claim text.