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The hardness of CBN is higher than that of conventional abrasive. High hardness means stronger and sharper cutting ability; CBN has high wear resistance, which means it is more difficult to wear than conventional abrasive; The ability to maintain the shape of abrasive particles is one of the main characteristics of CBN as a high-performance abrasive; The compressive strength of CBN is very high, which means that it can keep the particles intact and not easy to break when used under bad conditions; CBN has good thermal conductivity and can realize cold cutting during grinding.
1.High hardness and toughness
Cubic boron nitride (CBN) with high hardness and toughness is a superhard material synthesized by human beings with hardness second only to diamond, which is far higher than conventional corundum and silicon carbide abrasives, so it has better cutting ability and sharper.
2. High temperature resistance and good thermal stability
CBN can withstand the high temperature of 1250-1350 ℃, which is higher than the heat resistance of diamond at 800 ℃; When grinding and cutting ferrous materials, there will be no chip sticking phenomenon. The most ideal grinding wheel is for grinding hardened steel, high vanadium high speed steel, aluminum high speed steel and other metal materials that are sensitive to grinding temperature.
3. Strong chemical inertness
CBN is not easy to react with iron group elements, so it is very suitable for grinding materials with high temperature, high hardness and low thermal conductivity, such as high-speed steel, tool steel, die steel, high alloy hardened steel, chromium steel, nickel alloy, powder metallurgy steel and superalloy.
4. Good thermal conductivity
The thermal conductivity of CBN can reach tens to hundreds of times of that of corundum grinding wheel, so the grinding heat can be rapidly exported and the thermal deformation of workpiece can be reduced. It is very suitable for grinding materials with low heat 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 alloy: such as TC4.
5. Good grinding performance and machined surface quality
Because the CBN diamond grinding wheels can maintain the sharpness of the abrasive grain micro edge for a long time, it will make the machining accuracy and surface roughness value of the processed workpiece reach a relatively ideal effect, so it can improve the durability of the workpiece by 10% - 30%. Therefore, even if the workpiece is processed in batches, it will always obtain high shape, accuracy and consistency. CBN grinding wheel can obtain high dimensional accuracy and low surface roughness, the machined surface is not easy to produce cracks and burns, and the residual stress is small. The quality of the machined surface has been improved, generally without cracks, not easy to burn, and residual compressive stress can be obtained, significantly improving the fatigue strength of the workpiece. Generally, the durability of the ground workpiece can be improved by 30-50%.
6. Strong wear resistance and long service life
The grinding ratio of CBN grinding wheels for sale can reach 3500 - 5500, which is 100 times higher than that of conventional corundum wheel.
7. Environmental protection, pollution-free, energy saving and consumption reduction
No too much powder dust.
8. High work efficiency and good comprehensive economic benefits
Sharp grinding, small grinding force, long dressing cycle, less dressing amount and long tool life; With long service cycle and high grinding ratio, better economy can be obtained. The shape retention is good in use. It is not necessary to replace and trim the grinding wheel frequently, which saves labor hours, improves working conditions and is conducive to processing operation.
CBN is not suitable for grinding hard alloys and non-metallic hard materials. At high grinding temperature, CBN will react with alkaline water solution, CBN grinding wheel will decompose in 300 ℃ alkaline solution, and can decompose slightly in boiling water, which will destroy the crystal shape of abrasive particles. Therefore, only oily coolant can be used instead of water-based coolant during grinding.