Question

Extreme Pressure Additive (EPA) is mixed with cutting fluid for improving its power of
1. cooling
2. lubrication
3. cleaning of cutting zone
4. protection of machined surface

Answer 1

Correct Answer - Option 2 : lubrication

Explanation:

Purposes of application of cutting fluid in machining:

• The main aim of the application of cutting fluid is to improve machinability through reduction of cutting forces and temperature, improvement by surface integrity, and enhancement of tool life.
• 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.
• To form a solid lubricating layer under high pressure and temperature some extreme pressure additive (EPA) is deliberately added in a reasonable amount in the mineral oil or soluble oil. ​

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​Selection of Cutting Fluid:

Machining Material	Cutting Fluid
Grey cast iron	Dry air
Steels	Soluble oil
Aluminum and its alloys	kerosene oil
Stainless steels	High-performance soluble oil Neat oil with high concentration with chlorinated EP additive
Copper and its alloys	Water-based fluids