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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