Shigeo Zaima1, Hiroyuki Yagi2 and Satoshi Hattori3
1Department of Mechanical Science, Faculty of Engineering, Shizuoka University, Hamamatsu
In order to investigate the influence of cutting temperature on the behavior of built-up edge in aluminium machining, the temperature distribution in the cutting tool has been measured from the change in the melting condition of the thermopaint coated on the joint tool seam with rise in cutting temperature. The results obtained are as follows.
When the built-up edges grow and remain on the tool face, the temperature distribution in the tool is identical in shape to that in the tool without built-up edges, and the influence of built-up edges on the shape of the temperature distribution in the tool is not very remarkable. The dimensions of built-up edges decrease gradually with rise in cutting temperature owing to the rise in cutting speed, the increase in depth of cut, etc., and when the cutting temperature approaches a certain temperature, the built-up edges will decrease in dimensions, especially in length, and the built-up edges will disappear above that temperature. In the case of cylindrical specimens 5083, the temperature at which built-up edges in the tool tip disappear is about 320°C regardless of differences in the cutting condition such as the cutting speed and the depth of cut. From the softening curve on annealing and the index of line broadening in diffracted X-ray intensity, it is evident that the recrystallization temperature of the workpiece is in the range of 300∼350°C. This temperature is confirmed to be nearly equal to the above-mentioned recrystallization temperature of the workpiece.
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