Week 7: Cutting fluids, Purposes, Types and properties

Lecture Notes Page 51

Cutting Fluids

Purposes and application of cutting fluid
The basic purposes of cutting fluid application are:
Cooling of the job and the tool to reduce the detrimental effects of cutting temperature on the
job and the tool.
Lubrication at the chip - tool interface and the tool flanks to reduce cutting forces and friction
and thus the amount of heat generation.
Cleaning the machining zone by washing away the chip - particles and debris which, if present,
spoils the finished surface and accelerates damage of the cutting edges.
Protection of the nascent finished surface - a thin layer of the cutting fluid sticks to the machined surface
and thus prevents its harmful contamination by the gases like SO2, O2, H2S, and NXOY
present in the atmosphere.
However, the main aim of application of cutting fluid is to improve machinability through reduction of
cutting forces and temperature, improvement by surface integrity and enhancement of tool life.

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