How to Choose Dry Milling or Wet Milling in CNC Machine

Milling is essentially a discontinuous process. This causes the temperature at the cutting edge to fluctuate constantly between high temperature (about 1000 ℃) and low temperature. So use the correct way is very important in CNC machine.

The Influence of Cutting Fluid

As the cutting edge cuts in and out, temperature changes are exacerbated. As a result, the cutting edge is subject to thermal shock and periodic stress, which can lead to cracks and, at worst, premature end of tool life.

The higher the temperature of the cutting area, the less suitable it is to use the cutting fluid. 

In finishing operations, the use of cutting fluids does not shorten tool life as much as in roughing operations because of the reduced heat generated.

Hot cracks appear on cutting edges

Dry Milling

Dry milling can prolong the life of the cutting edge. The temperature does vary, but it stays within the design range of the carbide material.

Rough milling should always be carried out without the use of cutting fluid.

Use compressed air and oil mist

Wet Milling 

There are some exceptions to the use of cutting fluids:

  • Stainless steel and aluminum alloy finishing – used to prevent metal particles from bonding to the surface structure.
  • Milling superalloys at low cutting speeds – used to lubricate and cool parts.
  • Cast iron milling, used to wet and wash away dust, to protect the environment and health and ensure parts accuracy.
  • Thin wall parts milling, used to prevent geometric deformation.

When processing deep cavity, trace lubrication system (that is, compressed air containing a small amount of special oil) can be used to assist chip removal

In microlubricating systems, “oil mist” amounts to only a few milliliters of oil per hour and is discharged through normal filtered ventilation systems.

Use high flow internal and external coolan

*If wet milling must be performed, cutting fluid should be used enough.

Did you get it?

If you have any requests for milling cutter in CNC machine, please contact Our for more information. we are willing to help you and we are looking forward to communicate with you~

Write a Comment