Classification of grinding wheel

According to the abrasive wheel, divided into ordinary abrasives (corundum and silicon carbide, etc.) grinding wheels and superabrasive (diamond and cubic boron nitride) grinding wheel categories. General characteristics of the abrasive wheel has the shape, diameter, thickness, diameter milk, abrasive grain size, hardness, binders and tissues. Characteristics of the grinding wheel is not marked "organization", and the content of the abrasive in a concentration that much.
Ordinary abrasive wheel shape commonly more than 20 species. In addition to abrasives, the right wheel properties play a major role in binding agents, it affects the grinding wheel hardness, strength and grinding performance, commonly used vitrified, resin bond and rubber binder. Corresponding wheel ceramic grinding wheel, resin wheel and rubber wheel.
① ceramic grinding wheel: the production of a vitrified grinding wheel, has good chemical stability, the processing can be used as cutting fluid, but also for dry grinding. Ceramics are widely used for flat grinding, external circular grinding, and grinding, applied to the forming tool, screw, gears, crankshaft grinding. Ceramic grinding wheel speed can also be made to be used for high speed grinding, working speed up to 125 m / s, strong creep feed grinding ceramic grinding wheels, a cutting depth of up to 20 to 30 mm. Ceramic grinding brittle, not suitable for the harsh impact or work under heavy load conditions.
② resin wheel: made with resin bonded grinding wheels. Curing the resin temperature is low, shrinkage is small, can be made into a variety of complex grinding wheel shapes, and embedded in a metal ring and a reinforcing material such as glass, wire cloth, the grinding wheel, high strength, in a heavy impact force or the bad working conditions. Such as high-speed heavy-duty wheel speed of 80 m / s, load generally up to 9800 cows. Resin has some flexibility, with its grinding wheels made of mirror workpiece can get small surface roughness. Plasticity of the resin before curing, but also prepared as 0.5 mm or thinner cut or slotted wheel. Resin wheel chemical stability, suitable for use with alkaline cutting fluid.
③ rubber wheel: rubber binder production of the wheel. It has good flexibility, primarily for surface finish (such as soft polishing wheel), the bearing raceways and tapered grinding, centerless grinding is used as the guide wheels, the wheel can also be made thin, for cutting or grooving.
There are also magnesite wheel and shellac wheel. Magnesite wheel made of magnesium oxide (calcined magnesite), magnesium chloride solution and abrasive mixing, pressing or casting molding, hardening formed at about 40 ℃, mainly for tool sharpening, safety and other coarse blade. Abrasive wheel with shellac and shellac blend, small surface roughness for the occasion requires. Both wheel is not wide applicability, and most available resin wheel instead.
Super abrasive grinding wheels with diamond or cubic boron nitride abrasive grinding wheels made, usually by the substrate, the buffer layer and the super abrasive layer 3 parts. Grinding wheel grinding wheels with common characteristics substantially the same, but it is not marked "organization" and to the "concentration" means the number of abrasive content. This cross-sectional shape of the wheel diagram. Grinding wheel with a binder metal, resin, ceramic, and metal plating.
① diamond grinding wheel: diamond has the highest hardness, thus diamond grinding wheel, high efficiency, abrasion, long service life, to keep sharp surface to be machined without causing cracks and burns, high precision, smooth surface, suitable for grinding carbide, ceramics, optical glass, agate, precious stones, semiconductor materials, such as stone and refractory high hardness and brittleness of metallic and non-metallic materials.
② CBN grinding wheel: CBN diamond hardness slightly lower than the iron group metals chemically inert good, and  abrasive wheels  for grinding high hardness, high toughness steel materials, such as tool and die steel, alloy steel, resistant to hot steel, stainless steel, ductile iron and some nickel-and cobalt-based alloys.
Intensity of grinding wheel grinding wheel under the centrifugal force when the ability to resist rupture. As the wheel compressive or tensile strength than the flexural strength is low, typically only the wheel measured tensile strength is mainly determined by the size of the performance and the amount of binding agent, molding density and calcination  cutting tools . When the high-speed rotary wheel because the tangent along the aperture produces stress reaches a critical tensile strength of its own, the wheel will break, when the rotation speed of the wheel is called rupture velocity. Minimum burst speed should allow maximum operating speed of grinding wheel 1.8 to 2 times. To ensure the safety wheel, wheel rotation test must pass. Test speed shall be permitted maximum operating speed of grinding wheel is 1.5 to 1.6 times. For ease of use, wheel marks only the maximum permissible operating speed (rev / min or m / sec). Wheel must be used with safety guards.
Grinding wheel actual static unbalance through the center of mass and its axis of rotation parallel to the axis of rotation deviation state called static unbalance wheel. This is usually due wheel uneven density, both ends of the hole and the surface is not parallel or coaxial cylindrical deviation has caused. It will cause the machine vibration, shaft and bearing wear faster, uneven wheel wear and workpiece surface quality deterioration. Therefore, the wheel diameter greater than 200 mm or 200 mm outside diameter less than the wheel, but there are special requirements, must be static balance test. Wheel flange installed before use after hours must the weight balance.