CNC Diamond PCD and CBN Turning Inserts

                    CNC Diamond PCD and CBN Turning Inserts


PCD is formed in a large High Temperature-High Pressure (HT-HP) press, as either a diamond wafer on a backing of carbide, or forming a "vein" of diamond within a carbide wafer or rod.

PCD is no good for cutting steels for similar reasons, except substitute carbon (what diamond is made from) for nickel. That's why diamond is pretty much exclusively used for non-ferrous/fiberglass/composite materials. Oddly, it is still able to be used and recommended to cut carbon fiber. 

PCD is for any speed, period, in nonferrous materials. It will leave a good finish at low surface speeds, and it won't break down at ridiculous speeds (10k+ sfm). It also lasts much longer than any other type of insert, usually orders of magnitude longer.


PCBN is made by high pressure high temperature sintering of cubic boron nitride with a binder pahase, and there are mainly tow groups of binders, namely metal binder and ceramic binder. CBN and diamond are very similar in crystal structure, chemical bond and lattice parameters, thus they perfotm quite similar hardness and strength,. In cutting applications, the wear resistance of PCBN exceeds 50 times that of tungsten carbide.


PCBN is typically recommended to machine ferrous materials such as hardened steel components over the range 45 to 70HRc and grey cast irons. The material combines high hot hardness, chemical stability and abrasion resistance to provide an effective solution for machining these very different work-piece materials.


All of these are very fragile and will break down with anything more than light interrupted cutting.


Any questions,please contact us via pcdmetaltools@gmail.com.

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