Richard P. DaisleyBoppana V. Chowdary* REFFERENCE
An Investigation into the Metal Grinding Process under Sub-Zero Temperature Cutting Fluid
Department of Mechanical and Manufacturing Engineering
The University of the West Indies, St. Augustine, Trinidad and Tobago
The grinding process falls under the category of abrasive machining, which is
a material-removal operation that involves abrasive grits interacting with the
workpiece at high speeds and shallow penetration depths. In surface grinding,
high heat is generated at the contact regions due to friction between the grit-chip
and grit-workpiece interactions. This generated heat may damage the machined
surface due to a sudden rise in temperature which induces phase transformations
on the machined surface. These phase transformations lead to workpiece burns
that drastically decreases the fatigue life of the job. Thus, the elimination of
these burns is of considerable interest in this study. It is apparent that sub-zero
temperature coolants would have the ability to bring about lower grinding
temperatures than what is typically achieved under conventional fluids.
In this study, a factorial experimental approach was used to investigate
the effects of liquid carbon dioxide (LCO2 ) on grinding stainless steel (SS304)
material. The LCO2’s performance was benchmarked against grinding under
dry and emulsion coolant environments. Based on the experimental results it
was found that under specific conditions, LCO2 proves to be a viable coolant
alternative for grinding of temperature sensitive materials. Furthermore, under
low depths of cut (0.012 – 0.025 mm) and table speeds (100 mm/s – 258.33
mm/s), LCO2 restricts the occurrence of grinding burns.
Keywords: Surface grinding, Stainless steel (SS304), Sub-zero coolant, Liquid
carbon dioxide (LCO2 ), Grinding burns
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Richard P. DaisleyBoppana V. Chowdary*