The milling process is essentially an intermittent process.This will cause the cutting edge temperature between high (about 1000 ℃) and low temperature fluctuations.
Influence of cutting fluid
As the cutting edge is cut in and out, the temperature change intensifies.As a result, the cutting edge is subjected to thermal shock and periodic stresses, which can lead to cracking and, in the worst case, premature termination of tool life.
The higher the temperature in the cutting area, the less suitable the cutting fluid is.
In the finishing process, the use of cutting fluid will not shorten the tool life as much as in the roughing because the heat generated is reduced.
02 dry milling
Dry milling can prolong the life of cutting edge.The temperature does change, but it stays within the range of the carbide design.
The rough milling process should always be carried out without the use of cutting fluid.
Wet milling with cutting fluid
There are some exceptions where cutting fluid should be used:
1) stainless steel and aluminum alloy finishing - used to prevent metal particles from sticking to the surface structure
2) milling high temperature alloys at low cutting speed - for lubrication and cooling of parts
3) cast iron milling, used for wetting and washing away dust to protect the environment and health and ensure the accuracy of parts
4) milling of thin-wall parts to prevent geometric deformation
5) when processing deep cavity, micro lubrication system (i.e. compressed air containing a small amount of special oil) can be used to assist chip removal
Use compressed air and oil mist
In a microlubrication system, the amount of "oil mist" is only a few milliliters of oil per hour and is discharged through a normal filtration ventilation system.
Use high flow internal coolant and external coolant
If wet milling must be performed, sufficient cutting fluid should be used.