When CBN is used as an abrasive material, we mainly study the hardness, thermal stability, chemical inertness, wear resistance and thermal conductivity of CBN.
The hardness of CBN is much higher than other ordinary abrasives. High hardness means more cutting and sharper cutting. CBN has high wear resistance, which means it is more difficult to wear than ordinary abrasives. The ability to maintain the shape of the abrasive particles is one of the main characteristics of CBN as a high performance abrasive. CBN has a high compressive strength, which means it keeps the particles intact and not broken when used under harsh conditions. CBN has good thermal conductivity and can be cold cut during grinding.
1. High hardness and high toughness
Cubic boron nitride
(CBN) is a superhard material that is second only to diamonds synthesized by humans, which is much higher than ordinary corundum and silicon carbide abrasives. Therefore, it has better cutting ability and sharper.
2. High temperature resistance and good thermal stability
Cubic boron nitride can withstand temperatures of 1250-1350 degrees Celsius, which is higher than the heat resistance of diamonds of 800 degrees Celsius. When grinding and cutting ferrous materials, there is no stickiness. It is the most ideal grinding wheel for grinding hardened steel, high vanadium high speed steel, aluminum high speed steel and other metal materials sensitive to grinding temperature.
3. Strong chemical inertness.
Cubic boron nitride does not easily react chemically with iron group elements. Therefore, it is suitable for grinding various materials such as high-speed steel, tool steel, die steel, high-alloy hardened steel, chrome steel, nickel alloy, powder metallurgy steel and high-temperature alloy with high temperature, high hardness and low thermal conductivity.
4. Good thermal conductivity.
The thermal conductivity of CBN can reach tens to 100 times that of corundum grinding wheel, so the grinding heat can be quickly exported and the workpiece can be thermally deformed. It is very suitable for grinding materials with low thermal conductivity. Various spraying (welding) materials: nickel base, iron base, etc.; wear-resistant cast iron materials: vanadium-titanium cast iron, high-phosphorus cast iron, chilled cast iron, etc.; titanium alloys: such as TC4.
5. Good grinding performance and good surface quality.
Since the cubic boron nitride abrasive tool can maintain the sharpness of the abrasive micro-edge for a long time, the processing precision and surface roughness value of the workpiece to be processed can achieve a desired effect. Therefore, the durability of the workpiece can be increased by 10%-30%. Therefore, even batch-processed workpieces will always achieve higher shape, accuracy and consistency. CBN grinding wheel grinding achieves high dimensional accuracy and low surface roughness. The machined surface is less prone to cracks and burns, and the residual stress is small. The quality of the machined surface is improved. Generally, there is no crack, it is not easy to burn, and residual compressive stress can be obtained, which significantly improves the fatigue strength of the workpiece. Generally, the durability of the workpiece to be ground can be increased by 30%-50%.
6. Strong wear resistance and long life
The grinding ratio of CBN grinding wheel can reach 3500-5500, which is 100 times higher than ordinary corundum grinding wheel and 3-5 times higher than diamond grinding wheel.
7. Environmental protection, no pollution, energy saving
There is not much cubic boron nitride powder
8. High work efficiency and comprehensive economic benefits
It has sharp grinding and low grinding force. The CBN grinding wheel has a long dressing cycle, a small amount of dressing, and a long replacement time. The use period is long and the grinding ratio is high, so that better economy can be obtained. The shape is well maintained during use, eliminating the need to change the grinding wheel and dressing the wheel frequently. This can save man-hours, improve working conditions, and facilitate processing operations.