Civil Engineering Reference
In-Depth Information
Fig. 4.16. This inserted tooth face mill has a 2 Morse taper shank.
Coatings to reduce tool wear
Inserted milling tips are also made with different coatings that improve tip
life. One of the most common coatings is TiN (titanium nitride), which is gold
in colour. Some other coatings offer slightly better wear resistance; they are
TiCN (titanium carbon nitride), which is a blue grey in colour and TiAIN (titani-
um aluminium nitride), which is a violet bronze.
Inserted tip tools need a greater depth of cut, a higher speed and a higher
feed than HSS tools. Because of this, to take a heavy cut, the milling machine
needs to be rigid and have ample power to drive the cutter; this rules out us-
ing tungsten carbide tools on the smaller mini-mills. These smaller machines
just do not have enough speed or power, so most likely the tool will chip.
