Tool wear in the gear hobbing process while regarding the working angles

滚齿加工是制造外圆齿轮最有效的方法之一。为了批量生产mn > 6mm的大模数齿轮，越来越多地使用基于硬质合金可转位刀片的刀具。与传统滚刀相比，这些刀具将刀具轮廓分割成多个切削刃。此外，通过使用可转位刀片而不是传统滚刀，可以在更宽的范围内改变间隙和前角。尽管可转位刀片滚刀在工业上有广泛的应用，但由于意外的磨损发展，刀具寿命还不能预测。为了克服这些局限性，必须研究切削刃角度对刀具磨损的未知影响，本研究的目标是建立可转位刀片滚刀的刀具磨损模型。因此，提出了一种基于数学模型的滚齿过程特征值计算方法，并以此为基础建立了描述可转位刀片滚刀主要刀具磨损的磨损模型。除此数学模型外，还将在模拟试验中测量刀具前角和后角的影响。通过将试验结果与特征值进行比较，对磨损模型进行训练和改进，最后通过滚齿试验对磨损模型进行验证。

One of the most productive methods for manufacturing external cylindrical gears is gear hobbing. For serialproduction of large module gears with mn > 6 mm, increasingly tools based on indexable carbide inserts areapplied. In comparison to conventional hobs, these tools divide the tool profile onto multiple cutting edges.Furthermore, it is possible to vary the clearance and rake angle in a significantly wider range by usingindexable inserts rather than conventional hobs. Despite the broad industrial use of indexable insert hobs, thetool life is not yet predictable due to unexpected wear development. In order to overcome these limitations, thestill unknown influences of the cutting edge angles on the tool wear have to be examined.The objective of this research project is a tool wear model for indexable insert hobs. Therefore, a method forcalculating characteristic values for the hobbing process based on a mathematical model is to be developed.Based on these values, the wear model describes the main tool wear of indexable insert hobs. Besides thismathematical model, the influence of the tool rake and clearance angle will be measured in analogy trials. Bycomparing the results of the trials with the characteristic values, the wear model will be trained and improved.Finally, the wear model will be validated through a hobbing trial.