EXPERIMENTAL EVALUATION OF FRICTION COEFFICIENT AND LIQUID NITROGEN LUBRICATION EFFECT IN CRYOGENIC MACHINING
- 9 October 2002
- journal article
- Published by Informa UK Limited in Machining Science and Technology
- Vol. 6 (2), 235-250
- https://doi.org/10.1081/mst-120005958
Abstract
Cryogenic machining is considered an environmentally safe alternative to conventional machining where cutting fluid is used. However, the improved machinability in cryogenic machining has been attributed to the cooling effect of liquid nitrogen (LN2) in past research. Our recent studies indicate that LN2 may possess a lubrication effect in machining, as evidenced by a reduction of tool wear, the apparent coefficients of friction calculated by a mathematical model, and the secondary deformation in chip metallurgy. However, there is a need for a direct proof of LN2's lubrication effect before it can be claimed to be a lubricant in cryogenic machining. This paper presents the methodology and data from an experiment that measures the normal force and friction force directly in an altered machining setup. This procedure simulates the pure frictional behavior of the tool-chip interface in cryogenic cutting. The results show that LN2 cooled condition has a significantly lower coefficient of friction than dry con...Keywords
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