Lubrication effect of liquid nitrogen in cryogenic machining friction on the tool-chip interface

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The liquid nitrogen as an environmentally safe coolant has been widely recognized in cryogenic machining, its function as a lubricant is plausible due to its chemical inertness, physical volatility and low viscosity. Since a reduced friction is a direct witness of the lubrication effect from a tribological viewpoint, this paper presents an evaluation of the apparent friction coefficient on the tool-chip interface in cryogenic cutting operations to prove and characterize the lubricity of LN2 in cryogenic machining. The cryogenic cutting technology used in this study is based on a cooling approach and liquid nitrogen delivery system which are intended to apply liquid nitrogen in well-controlled fine jets to selectively localized cutting zones and to penetrate liquid nitrogen to the tool-chip interface. It has been found that the apparent friction coefficient can be significantly reduced in cryogenic machining, depending on the approach of liquid nitrogen delivery.

Original languageEnglish
Pages (from-to)936-946
Number of pages11
JournalJournal of Mechanical Science and Technology
Issue number4
Publication statusPublished - 2005 Apr

Bibliographical note

Funding Information:
The authors wish to express their gratitude for the financial support of the cryogenic machining project by the National Science Foundation

Funding Information:
(Grant No. DMI-9528710) and the Edison Materials Technology Center (Project No. CT-32), and for the joint partnership with Cineinnati-Milacron, General Motors-Delco Chassis, Tim-ken Company, Kennametal Inc., GE Aircraft Engines, BOC Group, Vortec Co., A.F.Leis Co., Enginetics Co., Abrasive-Form, Inc., and Gem City Engineering.

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering


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