The performance and application of CBN inserts
The hardness of CBN inserts is much higher than that of ceramic inserts. Because of its high hardness, it is also called superhard material with diamond.
It is often used to process materials with a hardness higher than RC48.
It has excellent high-temperature hardness - up to 2000 ℃, although Brittle than carbide inserts, but significantly improved impact strength and crush resistance compared to ceramic inserts.
In addition, some special CBN inserts can resist the chip load of large-gauge roughing and can withstand the impact of interrupted cutting and the wear of finishing and cutting heat.
These characteristics can meet the roughing of hard-to-machine materials such as hardened steel with CBN inserts.
▶The CBN composite layer of the welded CBN insert is relatively fragile, so it is often used to process workpieces with a unilateral margin of less than 0.3mm. ◀
MORESUPERHARD integrally sintered CBN inserts can cut hard-to-machine materials with large allowances, especially in the strong interrupted cutting process, leading the entire superhard material tool industry.
Pure boron nitride sintered insert:
The boron nitride ceramic insert formed by pure sintering has a hardness and The thermal conductivity ratio is higher.
When cutting high-hardness ferrous metal materials, the common thermal cracking and chipping of the edge of the insert will not occur;
Compared with the CBN sintered body containing other bonding materials, the service time of boron nitride ceramic inserts Extends more than 6 times.
The CBN inserts are suitable for processing materials: gray cast iron, various wear-resistant cast iron, cast steel, high hardness materials (such as hardened cold work tool steel, high-speed steel, bearing steel, powder metallurgy steel, high strength steel, high manganese Steel, high chromium cast iron, white cast iron, austenitic iron, cemented carbide, etc.
The difference between ceramic inserts and CBN inserts
Although CBN belongs to the category of ceramics in materials science, due to the difference in properties of CBN, SIN, Al2O3, and SiN materials, ceramic inserts are not as tough and hard as CBN inserts.
Therefore, according to the difference in hardness and toughness, when cutting hardened steel workpieces with hardness below 50HRC and a small depth of cut and small feed, ceramic inserts are a better choice. CBN inserts are suitable for workpiece hardness higher than 50HRC.
In addition, under the same flank wear condition, the residual stress on the workpiece surface after cutting by the CBN insert is also relatively more stable than that of the ceramic insert.
Therefore, in the suitable processing field of ceramic inserts, CBN inserts can also be used. Users can determine which insert material is more economical according to cost-effectiveness and processing needs.
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