What kinds of workpiece is suitable for grinded by CBN grinding wheel?
:yinglong :2017-09-06 16:42:51
The hardness of CBN is much higher than that of other common abrasive. High hardness means that it has stronger and sharper cutting ability. CBN has high abrasion resistance, which means it is more difficult to wear than normal abrasive. The ability to maintain the shape of the abrasive particle is one of the important characteristics of CBN as a high performance abrasive. The compression strength of CBN is high, which means that it can keep the grain intact and not broken when applied under harsh conditions. CBN has good thermal conductivity and can be cold cut when grinding.
The characteristics of CBN abrasive:
1. High hardness and high toughness.
CBN is a synthetic human. Its hardness is only lower than diamond materials. It is the world's second hardest material. Its hardness is much higher than ordinary corundum and silicon carbide abrasive. Therefore, it has better cutting ability and sharper ability.
2. High temperature resistance, good thermal stability.
CBN can meet the high temperature of 1250-1350c, which is higher than the heat-resistant 800 degrees of diamond. In the grinding and cutting of iron material, it will not appear sticky phenomenon. For hardened steel, high vanadium high speed steel, aluminum high speed steel, It will be the best choose.
3. Strong chemical inertia.
CBN is not easy to produce chemical reactions with iron elements, so for a variety of high-speed steel, tool steel, die steel, high alloy hardened steel, chrome steel, nickel alloy, powder metallurgy steel and low heat conduction rate of the material are very suitable to grind by CBN.
4. Good thermal conductivity
The thermal conductivity of CBN can be tens to 100 times that of the corundum wheel, so it can be exported rapidly and reduce the thermal deformation of the workpiece. It is very suitable for material grinding with low heat conductivity. All kinds of spray (welding) materials: nickel-base, iron base, etc. Wear-resistant cast iron material: vanadium - titanium cast iron, high - phosphorus cast iron, cold hard cast iron, etc.
5. Good grinding performance and good surface quality.
Due to the cubic boron nitride grinding tool can keep for a long time of abrasive micro blade sharp, can make the processed workpiece machining accuracy and surface roughness value is to achieve the ideal effect, so can make the durability of the artifact forward 10% to 30%. Therefore, even the batch processing workpiece will always get higher shape, precision and consistency. The grinding of CBN grinding wheel can obtain high dimensional accuracy and low surface roughness. The surface of machining is not easy to crack and burn, and the residual stress is small. The machining surface quality is advanced, generally no crack, not easy to burn, and can obtain residual compressive stress, obviously advancing the fatigue strength of the workpiece, usually, the wear-resistance of the grinder can advance 30-50%.
6. Strong wear resistance and long life
The grinding ratio of CBN grinding wheel can reach 3500-5500, which is a hundredfold higher than that of ordinary corundum grinding wheel, 3 to 5 times higher than diamond grinding wheel.
7. Environmental pollution, energy saving. Not too much powder dust.
8. High efficiency, comprehensive economic benefits.
Grinding sharp, grinding force, CBN grinding wheel dressing cycle long, less dressing and long changing time; Application cycle is long, high grinding ratio, may obtain a better fuel economy, application of shape stability is good, need not often change the grinding wheel, grinding wheel and repair frugal working hours, improve labor premise, is advantageous to the processing operation.
he most effective application field of CBN:
1. Grinding steel, CBN is preferred. A lot of experience on the import and domestic stainless steel and other mild steel grinding to achieve a very good effect, and efficiency of about 100% forward, the economic benefits forward 200 percent.
2. In the active machine on the mass production of the workpiece (miniature bearings, air compressor, crankshaft, camshaft, high precision thread, instrument, etc.) grinding and final grinding.
3. Request grinding wheel has a good Angle and Angle security complex type surface workpiece (insert gear knife, pull knife, high precision gear, die, punch, etc.) grinding.
4. Fine grinding and finishing grinding of large precision workpiece (guide rail, high precision screw, etc.). These workpieces are often used for grinding temperature, which can cause large deformation, and the best choice is the CBN grinding wheel.
5. Fine grinding and finishing grinding of fine parts made of alloy steel with high hardness (HRC55 and above). These parts can be used for grinding or grinding too quickly to get high precision.
6. Tungsten, molybdenum and other high speed steel, especially the cutting and precision of special high speed steel tools such as vanadium alloy steel and cobalt alloy steel.
7. Special steel, such as tungsten, tungsten and molybdenum high-speed steel, vanadium alloy steel, cobalt alloy steel, special high-speed steel tool grinding, hard-processing heat-resistant steel parts of the super-finishing, and other steel quenching tools honing.
8. Precision grinding and finishing of precision parts made of alloy structural steel made of heat resistant, stainless steel and high hardness (HRC55). These parts are too expensive or too dull to get high precision with ordinary grinding.
9. Workpiece, such as instrument and miniature bearing parts, produced on active or semi-active machine tools.
10. The grinding CBN of titanium alloy is the best grinding wheel selection.
