Abstract
If the cutting speed is high, the cutting temperature will also be high and that may reduce the tool life remarkably. However, use of a cutting fluid in high-cutting speed conditions will increase the thermal shock and can cause thermal cracks in the tool, thus resulting in increased tool wear. In this study, the heat generated by oxidation during cutting was suppressed by blowing nitrogen gas onto the cutting point in order to lower the cutting temperature and thus to prolong the tool life. As result, blowing nitrogen gas during cutting operations at high speeds and high feed rates, increased the tool life about two times, which allowed higher speeds and higher feed rates, thus reducing the total cutting time required. It was found that the blowing nitrogen gas makes it possible to improve productivity in a high-speed, high-feed rate milling operation.
