Machinability improvement by the use of liquid nitrogen in cryogenic machining has been reported in various studies. This has been mostly attributed to the cooling effect of liquid nitrogen. However, No study has been found in discussion on whether liquid nitrogen possesses lubrication effect in cryogenic cutting. This paper presents lubrication mechanism related to chip microstructure. The friction reduction was further reflected In larger shear angle and less secondary deformation in the chip microstructures.

Abstract
 Introduction
 Experiment Results and Discussion
 Conclusion
 Reference

• 전성찬 | Seong-Chan, Jun
• 정우철 | Woo-Cheol Jeong