Method of producing a toothed workpiece having a modified surface geometry

A method of producing a toothed workpiece:

• modifying a surface geometry of the toothed workpiece by a diagonal generating method using a tool, the tool having an axis of rotation extending in an axial direction, and a tool width direction extending parallel to the axial direction, and
• before a step of modifying the surface geometry of the workpiece, performing at least one out of the following steps:
• modifying a surface geometry of the tool by varying a position of a dresser with respect to the tool during dressing of the tool in line contact with the dresser, wherein the position of the dresser relative to the tool is varied in dependence on a position in the tool width direction;
• providing the tool with a surface geometry comprising a modification that has, in a first direction of the tool extending at an angle ρFS≠0 with respect to the tool width direction, a shape of at least one out of a constant function, a linear function and a quadratic function, with coefficients of the at least one out of a constant function, a linear function and a quadratic function varying in a second direction of the tool which extends perpendicular to the first direction;
• providing the tool with a surface geometry comprising a modification having, in a first direction of the tool extending at an angle ρFS≠0 with respect to the tool width direction, at least one out of a pitch and a crowning varying in dependence on the position in the tool width direction;
• wherein the desired modification is resolved into at least one first and one second modification, wherein the first modification has, in a first direction of the workpiece extending at an angle different from zero with respect to a workpiece width direction, a pitch which varies linearly in dependence on the workpiece width direction and a tooth thickness that varies quadratically in dependence on the workpiece width direction and wherein the second modification is produced by a change of machine kinematics during a machining process;
• wherein the method comprises at least a further step selected from
• specifying the desired modification of the workpiece as a superposition of a plurality of crownings, wherein a direction of each of the crownings is independently selected from at least one range of directions;
• specifying the desired modification of the workpiece as a crowning in a profile direction.

A method of producing a toothed workpiece, comprising steps of:

• modifying a surface geometry of the toothed workpiece by a diagonal generating method using a tool and a modification of machine kinematics during a machining process of the workpiece for producing a desired modification of the workpiece, the tool having an axis of rotation extending in an axial direction, and a tool width direction extending parallel to the axial direction;
• and
• before the step of modifying the surface geometry of the toothed workpiece:
• specifying the desired modification of the workpiece as a superposition of at least one crowning and an end relief of the workpiece;
• and
• determining a modification of a surface geometry of the tool suitable for producing said desired modification of the surface geometry of the workpiece and determining a suitable modification of the machine kinematics during the machining process;
• said step of determining the modification of the surface geometry of the tool comprising at least one out of:
• modifying the surface geometry of the tool in that a position of a dresser with respect to the tool is varied during dressing in line contact in dependence on a position in the tool width direction;
• and
• providing the tool with the surface geometry of the tool comprising a modification having, in a first direction of the tool extending at an angle ρFS≠0 with respect to the tool width direction, a shape that is at least one out of a constant function, a linear function and a quadratic function, with coefficients of this at least one out of constant function, linear function and quadratic function varying in a second direction of the tool which extends perpendicular to the first direction
• wherein the desired modification is resolved into at least one first and one second modification, wherein the first modification has, in a first direction of the workpiece extending at an angle different from zero with respect to a workpiece width direction, a pitch which varies linearly in dependence on the workpiece width direction and a tooth thickness that varies quadratically in dependence on the workpiece width direction and wherein the second modification is produced by a change of machine kinematics during a machining process.

A method of producing a toothed workpiece, comprising steps of:

• modifying a surface geometry of a workpiece by a diagonal generating method using a tool for producing a desired modification of the workpiece, the tool having an axis of rotation extending in an axial direction, and a tool width direction extending parallel to the axial direction, and
• before the step of modifying the surface geometry of the workpiece, performing at least one out of the following steps:
• modifying a surface geometry of the tool in that a position of a dresser with respect to the tool is varied during dressing in line contact in dependence on a position in the tool width direction;
• providing the tool with a surface geometry comprising a modification that has, in a first direction of the tool extending at an angle ρFS≠0 with respect to the tool width direction, a shape of at least one out of a constant function, a linear function and a quadratic function, with coefficients of this at least one out of a constant function, a linear function and a quadratic function varying in a second direction of the tool which extends perpendicular to the first direction;
• providing the tool with a surface geometry comprising a modification having, in a first direction of the tool extending at an angle ρFS≠0 with respect to the tool width direction, at least one out of a pitch and a crowning that varies in dependence on the position in the tool width direction;
• the method further comprising the step of specifying the desired modification of the workpiece as a waviness having an amplitude which has a non-constant value transverse to a direction of propagation of the waviness by specifying an amplitude function of the waviness which has at least one out of a linear form and a quadratic form transverse to the direction of propagation of the waviness and along wave peaks.

A method of producing a toothed workpiece:

• modifying a surface geometry by a diagonal generating method using a tool, and
• before a step of modifying the surface geometry of the workpiece, modifying a surface geometry of the tool in that a position of a dresser with respect to the tool is varied during dressing with in line contact in dependence on a position in the tool width direction, such that the modification of the tool produces, by the diagonal generating method, a corresponding modification on the surface geometry of the workpiece;
• wherein the modification produced on the workpiece by the modified tool is at least one out of
• a modification having, in a first direction of the workpiece extending at an angle different from zero with respect to a workpiece width direction, a shape of at least one out of a linear function and a quadratic function;
• wherein coefficients of this at least one out of a linear and a quadratic function vary in a second direction of the workpiece which extends perpendicular to the first direction, and
• a modification having, in a first direction of the workpiece extending at an angle different from zero with respect to a workpiece width direction, at least one out of a pitch and a crowning which varies in dependence on the workpiece width direction;
• wherein the first direction extends on the workpiece at an angle of less than 10 degrees with a line of action of a gear
• wherein the desired modification is resolved into at least one first and one second modification, wherein the first modification has, in a first direction of the workpiece extending at an angle different from zero with respect to a workpiece width direction, a pitch which varies linearly in dependence on the workpiece width direction and a tooth thickness that varies quadratically in dependence on the workpiece width direction and wherein the second modification is produced by a change of machine kinematics during a machining process.