CBN cutting tools belong to a type of superhard cutting tools, which are manufactured using ultra-high temperature and high pressure technology using CBN powder as raw material and a small amount of binder. Due to the high hardness of CBN cutting tools, it is very suitable for processing materials with hardness greater than HRC50 and strong wear resistance.
What material is CBN？
CBN (cubic boron nitride) is a superhard tool material developed after artificial diamond, which is transformed from hexagonal boron nitride (white graphite) under high temperature and pressure. CBN is a non-metallic boride, and its hardness is second only to diamond, far higher than high-speed steel and hard alloy. Therefore, after being made into tools, CBN is more suitable for machining stationary materials with carbide cutting tools.
What materials are CBN cutting tools suitable for processing?
CBN cutting tools can be used to cut materials such as hardened steel (bearing steel, mold steel, etc.), cast iron (gray cast iron, ductile iron, high chromium cast iron, alloy wear-resistant cast iron, etc.), high-speed steel, hard alloy, high-temperature alloy, etc., and have great advantages in ferrous metal processing.
It should be noted that if the processing material is soft metal or non-metallic, CBN cutting tools are not suitable for processing. CBN cutting tools are recommended only when the material hardness reaches a certain level (HRC>50).
Common CBN insert structural forms
Generally speaking, the commonly used cutting tools in turning machining mainly have the following structural forms: integral CBN insert and welded CBN insert, among which welded CBN insert includes integral welded insert and composite welded insert.
(1) Integrated CBN insert. The entire blade is sintered from CBN micro powder, with multiple cutting edges. Both the upper and lower blade tips can be used for cutting, resulting in high utilization of the blade blank. And the blade has high bending strength and can withstand high-speed cutting with large cutting depth, suitable for continuous, weak intermittent, and strong intermittent cutting environments. It has wide applicability and can meet the requirements of rough, semi precision, and precision machining.
(2) Integral welded CBN insert. The whole body penetration welding form has high welding strength and central hole positioning, which can directly replace the coating insertion. Suitable for machining conditions with a depth of<2mm, weak intermittent and continuous machining environments, meeting the needs of semi precision and precision machining.
(3) Composite welded CBN insert. After cutting, small CBN composite blocks are welded onto a hard alloy substrate to form various turning and boring blades. Generally, only one edge is available, mainly used for precision machining conditions.
At present, CBN cutting tools are widely used both domestically and internationally, especially for cutting difficult to machine materials in industries such as automotive manufacturing (engines, crankshafts, brake discs, brake drums, etc.), mining machinery industry (rolling mortar walls, slurry pumps, etc.), bearing gear industry (hub bearings, slewing bearings, wind power bearings, gears, etc.), and roller industry (cast iron rollers, high-speed steel rollers, etc.).
Post time: May-29-2023