What is the difference between A PCBN tool and a PCD tool? What are the cutting features of PCBN too

PCBN tool is a kind of artificial cubic boron nitride tool, the tool's hardness is second only to diamond, in grinding can often see this tool figure, today we specifically to understand: PCBN tool and PCD tool difference is what? What are the cutting features of PCBN tools?

What is the difference between A PCBN tool and a PCD tool?

PCBN cutter mainly processes black high-hardness metals, such as fired hard and cast steel (iron) which is resistant to high temperature (over 1000 degrees) and whose hardness is always 8000HV. PCBN cutter is a good tool material for improving production efficiency and processing difficult materials. But the material is not suitable for processing steel below 45HRC, easy to produce adhesion wear, crack.

PCD tool is mainly processing non-ferrous metals and other non-ferrous metals, can grind a very sharp edge, get a better processing surface, generally can reach 0.2 finish, but also the preferred material for processing non-metallic new materials, it is high wear resistance, friction is small, and the hardness can reach more than 10000HV, It can cut hard alloy and industrial ceramics and other high hardness products.

What are the cutting features of PCBN tools?

1, with high hardness and wear resistance, the heat resistance of PCBN up to 1000-1500 ℃ PCBN hardness at 800℃ is higher than the hardness of ceramics and hard alloy at room temperature.

2. With high thermal stability, PCBN crystal structure is similar to diamond, chemical bond type is the same, lattice constant is similar, so it has similar hardness and strength of diamond. The microhardness of PCBN powder is HV8000-9000, and the hardness of sintered body PCBN is generally HV3000-5000.

3, has excellent chemical stability, the chemical inertia of PCBN is particularly large, in 1200-1300℃ also does not react with iron materials, and carbon in 2000℃ reaction, in neutral, reducing gas, acid and alkali are stable, the bonding diffusion effect of various materials is much smaller than hard alloy

4, has good thermal conductivity, all tool materials in PCBN thermal conductivity is second only to diamond, thermal conductivity of 1300W/(M). ℃), this value is 3.2 times of copper, 20 times of hard alloy, and its thermal conductivity increases with the temperature rise;

5, it has a low friction coefficient, the friction coefficient between PCBN and steel is 0.1 -- 0.3, and the friction coefficient between cemented carbide and steel is 0.4 -- 0.6 under the same conditions, and the friction coefficient between PCBN and steel decreases with the increase of cutting speed.