Which among the following is the basic function of coolant in machining?

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ISRO SAC Technician B Fitter 21 Oct 2018 Official Paper
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  1. Job will be machined fast
  2. To cool the work material (job) and tool
  3. Job should not get rust
  4. To get good surface finish on job

Answer (Detailed Solution Below)

Option 2 : To cool the work material (job) and tool
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Detailed Solution

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Explanation:

Coolants (Cutting fluids):

  • Coolants (Cutting fluids) play an important role in reducing the wear of cutting tools.
  • The basic function of coolant in machining is to cool the work material (job) and tool.
  • Coolants (Cutting fluids) are essential in most metal-cutting operations.
  • During a machining process, considerable heat and friction are created by the plastic deformation of metal occurring in the shear zone when the chip slides along the chip tool interface.
  • This heat and friction cause the metal to adhere to the cutting edge of the tool, and the tool may break down.
  • The result is poor finish and inaccurate work.

Material

Coolant for Drilling

Aluminum

Soluble oil

Kerosene

Lard oil

Brass

Dry

Soluble oil

Mineral oil

Lard oil

Bronze

Dry

Soluble oil

Mineral oil

Lard oil

Cast iron

Dry Air jet

Soluble oil

Lard oil

Copper

Dry Soluble oil

Mineral oil

Lard oil

Kerosene Oil

Steel Alloys

Soluble oil

Sulphurized oil

Mineral oil

Lard oil

General purpose steel

Soluble oil

Sulphurized oil

Lard oil

 

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