APPLICATIONS

　　Synthetic diamond and CBN have high hardness and wear resistance, and are currently the hardest substances in nature. As a superhard material, it is widely used in various products, including abrasive products: such as grinding wheels, grinding stones, rollers, etc.; cutting tools: saw blades and saw blades for various stone materials; geological drilling: geological drill bits, hole protection Devices; tools: such as turning tools, milling cutters, boring tools, reamers, files, drawing dies, etc.

　　(1) The Mohs hardness of synthetic diamond is 10, and the microhardness is 10060 kgf/mm2.

　　(2) The wear resistance of synthetic diamond is 40-200 times higher than that of cemented carbide, 2000-5000 times higher than that of heat-treated alloy steel and high-speed cutting and quenching tool steel, and 90 times higher than that of corundum.

　　(3) The specific gravity is generally around 3.52g/mm3.

　　(4) Synthetic diamond has good chemical stability at room temperature and does not react with acid and alkali.

　　(5) The color of artificial diamond is usually yellow-green, and it is relatively stable, and the general physical and chemical effects will not cause it to change.

　　(6) Synthetic diamond starts to oxidize at around 720°C. If the diamond is heated in an inert atmosphere, it begins to graphitize at 1500°C.

　　(7) The performance of CBN is close to that of diamond, but its heat resistance is higher.

　　1 Model of synthetic diamond

　　(1) RVD is a diamond abrasive grain for resin and ceramic bond, which is suitable for processing cemented carbide. The particle shape of its product is irregular and brittle. Nickel-plated products are marked RVD-N; copper-plated products are marked RVD-Cn.

　　(2) MBD is a metal bonded abrasive tool, diamond abrasive grains for electroplating products, suitable for processing highly brittle non-metallic materials such as glass, ceramics, and soft stone.

　　(3) SCD is a special diamond abrasive grain for processing steel and hard alloy. The particle shape of this product is mostly equal-area shape, the crystal surface is irregular, and it has a certain degree of brittleness. It is a variety to be developed in the future.

　　(4) SMD is a diamond abrasive grain for sawing, drilling and dressing tools. The product has regular particle shape, complete crystal, smooth crystal surface, high toughness, high mechanical strength, low inclusion content, high transparency, and mostly hexahedron. - Octahedral polymorphs and octahedral crystals.

　　(5) DMD is a special diamond for dressing tools or other single-grain tools. It is suitable for processing hard stone, reinforced concrete and hard non-metallic materials.

　　2 The particle size standard of synthetic diamond

　　3 Metal bond used in diamond and CBN metal bond abrasive tools

　　The metal bonds used in diamond and CBN metal bond abrasive tools can be formulated with metal powder or special alloy metal powders. The optional metal bonds are listed in Table 2.

　　Note: Alloy codes ending in -K are products of Kaston Factory, and those ending in numbers ending in H are products of Huanghe Cyclone Factory

　　4 Abrasive concentration in diamond and CBN metal bond abrasive tools

　　The diamond and CBN used in diamond and CBN metal bonded abrasive tools have different concentrations. The quantities of diamond and CBN in different concentrations are shown in Table 3.

　　5 Formula Calculation of Diamond and CBN Metal Bond Abrasives

　　1. Concentration and quality

　　A—Concentration

　　Av—the unit volume of diamond and CBN Av=A×0.25 cm3Ad—the unit mass of diamond and CBN Ad=A×0.88 g/ cm3

　　2. Metal bond

　　M—Metal Bond

　　Mv—metal bond volume

　　Mv=1-Off

　　Md—metal bond quality

　　Md= Mv×d

　　d—alloy density g/ cm3

　　3. Profile

　　Vd—abrasive + alloy quality

　　Vd= Ad+ Md

　　R—wetting amount

　　R= Vd×(7/1000), (liquid paraffin)

　　4. The amount of coated diamond and CBN abrasives = Ad + weight gain alloy = Md - weight gain

　　5. Molding single weight

　　D—molding unit weight D= Vd+R

　　6 Examples of formula calculation for diamond and CBN metal bonded abrasive tools

　　1. Grinding tool specification: 11A2 MBD 100/120 M 100

　　Diamond model: MBD 100/120

　　Metal binder: M4 Cu75Sn18Ti7 d=8.35 g/ cm3

　　Concentration: A=100%

　　2. Abrasive quality: Ad=A×0.88g/cm3=100%×0.88g/cm3=0.88g/cm3

　　3. Alloy quality: Md= Mv×d=(1-100%×0.25)×8.35 g/cm3=6.26g/cm3

　　4. Dry material density: Vd=Ad+Md=0.88+6.26=7.14 g/cm3

　　5. Wetting agent: R= Vd×7/1000=0.05 g/cm³

　　6. Forming unit weight: D=Vd+R=7.14g/cm3+0.05g/cm3=7.19 g/cm3

　　The above calculation process can also be given automatically by using a formula design program.