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