Method for Modifying the Flanks of a Gear Wheel Tooth with the Aid of a Tool

摘要

The invention relates to a method for modifying the geometry of gear wheel tooth flanks with a tool with a toothing that engages with the gear wheel during a precision machining. A varied profile is produced on the tool over the width of the tool, in that during a dressing procedure a dressing wheel is moved along the tooth flank of the tooth to be dressed. The width of the teeth of the dressing wheel is much smaller than the width of the tool. In order to cover the width of the tool a length must be covered corresponding to a multiple of the width of the teeth of the dressing wheel. After the dressing, the precision machining of the gear wheel is carried out with the tool. Since the dressing wheel is moved with a changing pitch and a changing crossed axes angle relative to the tool, the modification of the tooth flank geometry can be reproduced in the tool. A modification of the crossed axes angle dependent on the helical angle of the tool takes place with equalisation of the helical angle of the tool changing over the width of the teeth of the tool.

主权项

1. A method for modifying the geometry of the tooth flanks of a gear wheel with the aid of a tool, which has a toothing engaging with the teeth of the gear wheel during a precision machining, wherein the following working steps are performed:
a) forming a profile on the tool varying over the width of the tool, in which a dressing wheel is moved during a dressing procedure along the tooth flank of the tooth to be respectively dressed, wherein the width of the teeth of the dressing wheel engaging with the tool to be dressed is smaller than the width the tool to be dressed to such an extent that, in order to cover the width of the tool to be dressed, the dressing wheel has to be moved by a length in a direction that corresponds to a multiple of the width of the teeth of the dressing wheel, and b) precision machining of the gear wheel with the tool that has been dressed in this way, wherein the dressing wheel during the working step a) is moved with a changing pitch and a changing crossed axes angle in relation to the tool to be dressed, in order to incorporate the respective modification of the tooth flank geometry into the tool, and wherein the precision machining of the tooth in the working step b) takes place in the machining process by a modification of the crossed axes angle dependent on the helical angle of the tool with equalisation of the changing helical angle of the tool over the width of the teeth of the tool.