Method of producing one or more workpieces

Patent metadata

Field	Value
Publication number	US-10500657-B2
Application number	US-201615207442-A
Country	US
Kind code	B2
Filing date	Jul 11, 2016
Priority date	Jul 10, 2015
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

One or more workpieces having a desired gear geometry may be produced by means of a suitably dressed tool which is respectively dressed by a dresser after the carrying out of one or more machining steps before further machining steps are carried out at the same workpiece or at further workpieces. A relative position between the dresser and the tool may be changed by a corresponding additional adjustment of the axes of movement of the dressing machine in a later dressing process with respect to an earlier dressing process in addition to the smaller center distance resulting from the smaller tool diameter.

First claim

The invention claimed is:

1. A method of manufacturing one or more workpieces having a desired gear geometry by means of a suitably dressed tool, wherein, after carrying out of one or more machining steps, a first dressing of the tool is respectively performed by a dresser of a dressing machine before further machining steps are carried out at a same workpiece or at further workpieces, wherein, in a later dressing procedure, a relative position between the dresser and the tool is changed with respect to a prior dressing procedure in addition to a smaller center distance resulting by a smaller tool diameter by a corresponding additional adjustment of axes of movement of the dressing machine, wherein the additional adjustment of the axes of movement of the dressing machine is in accordance with one or more of the following: the additional adjustment partly compensates modifications of a gear geometry which result by the smaller tool diameter; an adjustment with respect to a dressing without such an additional adjustment effecting a change of a profile crowning resulting during dressing; the additional adjustment is selected such that a deviation of the gear geometry resulting on the workpiece from the desired gear geometry is reduced and/or minimized; and the additional adjustment reduces or minimizes a deviation of the gear geometry produced on the tool by the dresser from the desired gear geometry.

2. The method in accordance with claim 1 , wherein the tool is used having a conical base shape and is in accordance with one or more of the following: wherein the a conical angle is selected such that the gear geometry resulting on the workpiece has deviations from the desired gear geometry which are as small as possible; wherein a stretching and/or a compression of a modification produced on the tool by a modified dresser is reduced or minimized by a change of a profile angle of the tool, in production of an asymmetrical gear; and wherein a conical angle is changed with respect to the earlier dressing procedure in the later dressing procedure performed after the earlier dressing procedure.

3. The method in accordance with claim 1 for producing a plurality of workpieces, wherein the tool is respectively dressed after the production of the one or more workpieces before further workpieces are machined.

4. An apparatus for determining settings of axes of movement of a dressing machine used for multiple dressing of a tool,
the apparatus comprising a processor, non-transitory memory, and instructions for executing the method of claim 1 ,
wherein an input function is provided for inputting a first tool diameter of the first dressing; and a determination function is provided for determining the settings of the axes of movement of the dressing machine to be used for dressing the tool with the first tool diameter; wherein the input function is provided for inputting a smaller tool diameter with respect to which the dresser is configured; or wherein an input function is provided for inputting a desired gear geometry of the workpiece or of the tool.

5. A gear manufacturing machine including the apparatus in accordance with claim 4 , wherein the gear manufacturing machine has a workpiece holder and a tool holder provided in addition to the tool holder of the dressing machine, and a gear manufacturing machining control system for controlling the workpiece holder and the tool holder for carrying out gear manufacturing machining.

6. A dressing machine having a tool holder for holding a tool to be dressed and having a dresser holder for holding a dresser used for this purpose, the dressing machine comprising:
an axis of rotation;
further axes of movement by which further degrees of freedom can be set independently of one another when dressing the tool in line contact with the dresser; and
a control system comprising a function, a processor, non-transitory memory, and instructions for carrying out dressing steps in the method in accordance with claim 1 ,
wherein the function carries out the first dressing and the later dressing of the tool with changed settings of the axes of movement of the dressing machine,
wherein the control system includes further instructions for in a later dressing procedure, changes to the relative position between the dresser and the tool with respect to the earlier dressing procedure performed before the later dressing procedure in addition to the smaller center distance resulting by the smaller tool diameter by the corresponding additional adjustment of the axes of movement of the dressing machine.

7. A gear manufacturing machine including the dressing machine in accordance with claim 6 , wherein the gear manufacturing machine has a workpiece holder and a tool holder provided in addition to the tool holder of the dressing machine, and a gear manufacturing machining control system for controlling the workpiece holder and the tool holder for carrying out gear manufacturing machining.

8. A method of manufacturing one or more workpieces having a desired gear geometry by means of a suitably dressed tool, wherein, after carrying out of one or more machining steps, the tool is respectively dressed before further machining steps are carried out at a same workpiece or at further workpieces, wherein, in a later dressing procedure, a profile angle of the tool is changed with respect to an earlier dressing procedure so that the workpiece or workpieces is or are gear manufacturing machined with a different profile angle of gearing of the tool after the later dressing procedure than after the earlier dressing procedure performed before the later dressing procedure, wherein at least one out of the following conditions applies:
a) the profile angle is respectively selected such that a deviation of a gear geometry resulting on the workpiece is reduced or minimized with respect to the desired gear geometry; and
b) at least one out of a stretching and a compression of a modification produced on the tool by a modified dresser is reduced or minimized by the change of the profile angle.

9. The method in accordance with claim 8 , wherein an asymmetrical gear is produced; and wherein at least one out of the following conditions applies:
a) the profile angle of the tool on right and left flanks is selected such that the deviation of the gear geometry resulting on the workpiece on the left and right flanks is reduced overall with respect to the desired gear geometry; and
b) the stretching or the compression of the modification on the left and right flanks produced on the tool by the modified dresser is reduced overall.

10. A method of manufacturing a workpiece having a desired gear geometry by means of a tool suitably dressed by a modified dresser, comprising the steps:
specifying the desired gear geometry of the workpiece; and
determining a suitable profile angle of the tool and a suitable relative position between the dresser and the tool during dressing of the tool for providing the desired gear geometry of the workpiece at least within a permitted tolerance in the machining by the tool, wherein the profile angle and the relative position between the dresser and the tool are determined during dressing such that a desired compression and/or stretching of a modification of the dresser results on the tool during dressing, with the profile angle being determined such that the compression and/or stretching of the modification of the dresser on the tool resulting by the relative position between the dresser and the tool is compensated by the profile angle.

11. An apparatus for determining a setting of axes of movement of a dressing machine and a geometry of a tool used for producing a workpiece having a desired gear geomet

Assignees

• Liebherr Verzahntech Gmbh

Inventors

• Wuerfel Robert

Classifications

• G05B2219/49171

  Compensate for dressing amount · CPC title

• G05B19/186

  Generation of screw- or gearlike surfaces · CPC title

• G05B19/404

  characterised by control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia (G05B19/19, G05B19/41 take precedence) · CPC title

• B23F19/10 Primary

  Chamfering the end edges of gear teeth · CPC title

• B24B53/07

  by means of forming tools having a shape complementary to that to be produced, e.g. blocks, profile rolls · CPC title