炭素鋼およびチタンの真空中の切削状態

真空切削の研究 (第1報)

抄録

This paper presents both the outlines of experimental equipments which were specially made for the turning in vacuum and the results of some experiments in machining of the carbon steel and the titanium under various grades of vacuum.
It is found that the state of chip formation becomes unfavorable with the intensing of the vacuum, and this phenomenon would be attributed to the imperfect formation of the mono-molecular adsorption layer of the air at the tool-chip inter face.
Moreover, considering the results of some experiments of oxygen jet machining, it is able to classify the state of chip formation into following three types according to the state of the atmosphere; (1) the cutting process with the metallic contact between the tool and the chip (2) the cutting process with the formation of the mono-molecular adsorption layer of the air at the tool-chip inter face (3) the cutting process with the formation of the oxides at the tool-chip inter face. The type 1 is observed under high grade of the vacuum and the type 3 is attained only by the supply of the oxygen jet.