Lubro-cooling

First, in flood cooling, coolant pump consumes an extra 150 watts' power, and another reason is associated with the low coefficient of friction provided by the efficent lubra-cooling effect of LN₂.

Cryogenic machining is a machining technique in which the usual flood lubro-cooling liquite (an oil-in-water emulsion) is substituted by a jet of liquid nitrogen (LN2) or pre-compressed carbon dioxide (CO₂).

They have also found that the hybridization of CO2 þ MQL produced a better surface finish irrespective of turning passes than other various lubro-cooling approaches.