Cermet Tools
Cermet tools have the following advantages:
1.The surface finish is better than that produced with carbides under the same conditions, which often eliminates the need for finish grinding.
2.High wear resistance permits close tolerances for extended periods, ensuring accuracy of size for larger batches of parts.
3.Cutting speeds can be higher than with carbides for the same tool life.
4.When operated at the same cutting speed as carbide tools, cermet tool life is longer.
5.The cost per insert is less than that of coated carbide inserts and equal to that of plain carbide inserts.
Use of Cermet Tools
Titanium carbide cermets are the hardest cermets and are used to fill the gap between tough tungsten carbide inserts and the hard, brittle ceramic tools. They are used mainly for machining steels and cast irons where high speeds and moderate feeds may be used. See Table 3-2-8 A to F for recommended cutting speeds for machining various material groups.
Titanium carbide-titanium nitride inserts are used for semifinish and finish machining of harder cast irons and steels (less than 45 Rc) such as alloy steel, stainless steel, armor plate, and powder metallurgy parts.
For more information on CUTTING TOOL TECHNOLOGY see the Websites: www.carboloy.com www.cormorant.sandvik.com/us www.kennametal com www.niagaracutter.com
Table 3-2-8 Cermet grade inserts with recommended material applications and suggested speed ranges. (Hertel Carbide Ltd.)
(Arthur Gill, Consultant – Kelmar Associates)
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