Cubic boron nitride (PCBN) inserts Properties and Applications

CBN and ceramic materials as belonging to non-metallic materials, polycrystalline cubic boron nitride single crystal cubic boron nitride powder by adding some binder

sintered at high temperature. Composite sheet and the overall piece of two kinds. Carbide composite sheet is as underlay, above

Sintering a layer of polycrystalline boron nitride, this only applies to finishing blade; the overall blade is the use of the whole sintered CBN powder bulk material,

is formed by sharpening the blade, its main purpose is to roughing, also be used for finishing.
PCBN features:
1, high hardness, good wear resistance.
The hardness of cubic boron nitride sintered body is generally 3500 ~ 4000Hv, ceramics; 2400 Hv, carbide 1800 Hv or so. High hardness and wear resistance has brought

very good, generally speaking, cubic boron nitride coating alloy wear resistance is 30 times that of uncoated carbide

50 times, the ceramic blade 15 to 20 times.
2, high thermal stability;
CBN began in 1370o above cubic to hexagonal crystal by the transformation; cutting at 1000oC high temperatures, the surface does not produce oxidation, high

temperatures reduce the degree of hardness than carbide and ceramic inserts smaller, which create the conditions for high-speed cutting

.
3, good chemical stability:
Chemical inertness CBN particularly in neutral medium in the air, the pH is stable, does not react with the carbon in 2000o, and iron family material 1200oC ~ 1300oC

not react when adapted for cutting ferrous metal materials.
4, good thermal conductivity;
Thermal conductivity of 79.54w / m, k, second only to diamond, with increases in temperature, thermal conductivity increases, is conducive to heat dissipation.
5, low coefficient of friction:
Coefficient of friction coefficient of 0.1 to 0.3 against the cutting force is small cutting temperature low not abnormal times, difficult to produce sticky cut

conducive surface quality.
6, grinding resistance:
CBN inserts can be repeated sharpening, user-reducing tool costs.
Because of these characteristics, cubic boron nitride cutting tools are widely used in hardened steel, tool steel, chilled cast iron, nickel, cadmium should wear after

cold iron, high chromium cast iron (Cr27). Hard nickel-iron, white cast iron, thermal spraying, weldment high hardness difficult materials. For this feature, Zheng

State Bot Hard Materials Co., Ltd., Creative launched the first in the country overall CBN blade hit the Cr27 trial success. After several years of efforts, spread

across the country hard material processing industries, and achieved Feng Xiang achievements accumulated many

Successful experience.
Industrial pumps slurry production
According to the pump flow components industry characteristics and processing characteristics of the material, cast iron trial in Cr15Mo3 hit success. After using our

CBN tools, to achieve a smooth hardening process, eliminating the step of annealing and then quenched two, saving a lot of manpower,

Electricity. Cutting parameters greatly improved, greatly improving production efficiency.
Roll processing
Many large domestic enterprises have used the roll superhard cutting tool for chilled cast iron, hardened steel rolls for other types of waste trucks, rough and finish

turning, have achieved good results, efficiency is improved by 2-6 times, saving processing time and 50% -80% power.
Auto parts
Gray iron brake disc brake disc surface finishing, surface finish reach 0.4-0.8, more efficient than ceramic blade increased by 3 times, durability increased by 2

times, customers greatly enhance economic efficiency.