초 냉각 가공에서의 LN2 의 감찰 효과 연구 -물리적 현상에 의한 마찰 계수-

Investigation of LN2 Lubrication Effect in Cryogenic Machining -Part 1: Friction Coefficient related to cutting force component with Physical Evidences-

This paper presents some physical evidences indicating that reduced friction occurs in an cryogenic machining process, in which LN2 is applied selectively in well-controlled jets to the selected cutting zone. In machining tests, cryogenic machining reduced the force component in the feed direction, indicating that the chip slides on the tool rake face with lower friction. This study also found that the effectiveness of LN2 lubrication depends on the approach how LN2 is applied regarding cutting forces related.