All about CBN coating and its behaviour!
The machining of harder materials requires
significantly harder cutting materials. In addition to diamond,super hard cubic
boron nitride is also eligible for machining of steels. It is also known as the
second hardest known material. The development of CBN coating and cutting equipment’s are added
advantage of coating and cutting material CBN inserts which play a major role
in many branches of industry.
Wear Behaviour
In general, the wear modes differ with tool
composition and cutting-edge geometry at the cutting force and cutting temperatures
under which is based on given cutting conditions. A strong coating is not
obtained with the evolution of new coatings.
Diamond Coating
Diamond has unique physical properties and that
makes it an ideal cutting tool application. It is the hardest known material
and so is highly abrasion resistant.The conductivity of the diamond helps to
remove damage heat from the cutting edges.
Coating Process
Surface Preparations - The parts which are
needed to be coated is cleaned thoroughly and put into a two-step chemical
preparation process.
Coating Procedure - The parts are loaded into a
vacuum chamber containing hydrogen and methane gasses at very high pressure.
When the proper conditions are achieved, the activated carbon atoms can
recombine into a pure diamond film over the entire tool surface. This coating
process is typically very slow.
Hole Quality - Drill lifetime is a major issue;
damage of the composite structure will always be a very costly mistake.
Conclusion
There are now several companies which produce
diamond-coated tools for the aerospace industries. CBN inserts when delivered
are so-called "Solid CBN". Inserts are commonly used in mass
production and focus on productivity and quality. Machining materials can
preferably use iron content. This helps to achieve operation on high standard
material removal.
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