Abstract
This paper presents the coating effects of oleic acid as a kind of organic polarity substance on the orthogonal cutting for austenitic stainless steel. The oleic acid was coated to the surface both of solution-heat treated and of pre-cut stainless steels. Solution-heat treated steel was almost not affected by coating oleic acid, whereas pre-cut steel, the cutting force decreased and the finished cut surface roughness was improved, and associated with the chip shape changed from tear type to thin shear type. In addition, it was found that more the pre-cutting depth, weaker the coating effect of oleic acid. On the whole, the coating effects of oleic acid for the stainless steels are weaker when compared with pure metals such as iron, copper etc. From the infrared spectrum measurements, the chemisorptions between the oleic acid molecules and metal atoms formed around the dislocation at the upheaved region in front of chip was estimated. It would be considered that the surface hardened to a certain extent as the dislocations movement restrained by the chemisorptions, and then the chip was formed and separated easily.
