Due to the different workpiece materials and machining requirements that need to be processed, different grinding wheels should be choose. Even if the same kind of workpiece material is ground, the grinding ratio of different size grinding wheels may differ by 2 to 5 times. Therefore, the appropriate grinding wheel should be selected.

Diamond grinding wheels are the best grinding tools for grinding high-hardness, brittle, non-metallic materials such as hard alloys, optical glass, ceramics, precious stones, and stone materials. However, diamond is not suitable for grinding steel because it is easy to carbonize at 700°C~800°C. The hardness of CBN is slightly inferior to that of diamond, but its thermal stability is good (it can withstand temperatures of 1300°C to 1400°C). It does not decompose at high temperatures like diamond, ie oxidation and graphitization, and it is chemically inert with iron group elements. With high thermal conductivity (46 times that of corundum), the long life of the grinding wheel made by it (which can be several times to more than 100 times that of corundum grinding wheel) is an alternative to corundum grinding hardened steel, high speed tool steel, and bearing steel. , stainless steel, heat-resistant steel and titanium alloy and other high hardness and toughness of the best metal materials.

Superhard abrasive wheel binder resin, metal, ceramic, electroplating and brazing. Resin bond grinding wheels are mainly used for sharpening tools, grinding holes, cylindrical grinding and plane grinding; metal bonded grinding wheels are used for cutting grinding, forming grinding of optical curve grinding machines, single-blade grinding tools, and grinding of small drill bits. Spiral groove, also suitable for electrolytic grinding; ceramic bond grinding wheel grinding efficiency, shape retention, high durability, easy to trim, long service life of the grinding wheel, and because the ceramic binder itself has a good chemical stability, Heat resistance, oil resistance, acid and alkali resistant erosion, adaptable to various grinding fluids, low grinding cost, so it has become the first choice for efficient and high-precision grinding. Plating grinding wheel is suitable for high-speed grinding and forming grinding. Also suitable for efficient grinding of holes (wet grinding) and use on coordinate grinding machines; brazed grinding wheels are suitable for ultra-high speed grinding.

It must be pointed out that different grades of abrasives, due to different manufacturing processes, the crystal morphology, particle shape is also different, but with different strength, thermal stability and crushing properties, should be based on the type of binder, grinding of workpiece materials and grinding methods, Choose different abrasives. For high-performance, high-precision grinding of ceramic bond grinding wheels, high-strength and sharp-grained abrasives can be used, such as DeBeers PDA (synthetic diamond) and ABN800 (CBN) or similar. Grade.

The superhard grinding surface has a metal plating clothing (metal plating can reinforce and toughen, reduce thermal shock, and act as a bridge between the abrasive grain and the binding agent, which can improve the performance of the grinding wheel) and non-plating metal clothing. The species should be selected according to the different types of binders, workpiece materials, dry grinding and wet grinding. Copper mills are generally used for dry grinding, such as RVD-Cu and CBN-Cu; nickel clothing is used for wet grinding, such as RVD-Ni and CBN-Ni. Currently, the plating metals have evolved from nickel and copper to titanium, tungsten alloys, non-metal ceramics, etc., from a single plating layer to a composite plating layer, and have been developed from abrasive grain plating to micro-powder plating.

The concentration of the hard abrasive wheel can not be chosen too low, high concentration can bring high grinding ratio, the 200% concentration of superhard abrasive wheel is actually a kind of ordinary wheel with superhard abrasive as the auxiliary material, generally not recommended Named with. At present, high-speed and high-efficiency grinding adopts higher concentrations. The concentration of ceramic binder CBN grinding wheel adopts higher concentration for high-efficiency grinding, and the concentration of ceramic binder CBN grinding wheel generally chooses more than 125%, such as the imported supporting ceramic CBN grinding wheel. The concentrations are generally 175% to 200%.

The hardness level of the grinding wheel indicates the size of the abrasive holding force of the binder. The reasonable choice of the hardness and stability of the grinding wheel and the hardness is an important prerequisite for guaranteeing the grinding quality. Foreign superhard abrasive grinding wheels generally have 3 to 7 hardness grades to choose from, but China's superhard grinding wheels do not have a hardness grade, and GB6409 also does not specify the corresponding standards, so the quality is not easy to guarantee and it will inconvenience users. Complement and improve.

Specifications Of Vitrified Diamond Grinding Wheel:

Model	D (Mm)	T (Mm)	H (Mm)	W (Mm)	X (Mm)
	150	40	32, 40	5, 10, 15, 20	10
	125	40	32, 40	5, 10, 15, 20	10
	100	40	20, 32, 40	3, 5, 10, 15, 20	10
Grit: 325/400, W40(500#), W28(600#), W20(800#) , W10(1500#),W5(3000#),W3(5000#)

Grain Size Selection Of Vitrified Diamond Grinding Wheel:

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