Abstract
A new machining process, called auscutting, has been developed in which the cutting operation is performed in supercooled austenitic state during quenching.In order to realize a new manufacturing process for bearing races with auscutting, it is desired to obtain the satisfactory tool life.In this paper, from the viewpoint of the improvement on the tool life many factors which influence the tool life are examined and the methods for stabilizing and lengthening the tool life are considered.
The results obtained are summarized as follows :
1) The short-lived factors in auscutting are the vibration caused by the saw-toothed chip formation, a drop of the deflective strength of the tool material by high cutting temperature and the adhesion failure of the work material.The methods for improving the tool life are the improvement on the stiffness of machine parts such as the tool holder, the suitable cutting speed of about 100m/min and the increase of the nose radius of the tool.
2) As the frequency of the saw-toothed chip formation is increased after the tool failed in auscutting, it is possible to detect the tool failure by the change of the vibration frequency.
