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The rational use of super abrasive grinding wheel
2013-04-15 by seoer3
Of superhard abrasive production course started late, but rapid development of synthetic diamond production has reached 500 million karats left in 1997, the CBN annual production of 8.0 million carats. Has initially formed a super-hard abrasives, special grinding fluid, specially trimmed technologies and installations and specialized grinder and a complete technology system. At present, China has been able to produce RVD, CBN and gold-plated high-grade abrasive clothing products, such as metal matrix ceramic CBN grinding wheel, 65m / s vitrified bond CBN wheel ", the varieties and specifications of the grinding wheel has formed a series of ultra- hard abrasive wheel diameters up to φ750mm (trial φ1100mm grinding wheel), the highest use of line speed up to 80m / s, and the development of 125m / s high-speed grinding wheel to create a premise to promote the use of superhard abrasive. Can be expected, followed by the widespread use of super abrasive grinding wheel grinder manufacturing will promote the reform and development, and the development of efficient high-performance grinding machines, will lead to further promote the use of the cutting wheel.
Pass where people thought the diamond wheel, diamond and iron group elements chemically inert, is not suitable for gray cast iron grinding of a workpiece, this case, however, occurs only at high temperatures. For example, diamond grinding wheel, when the temperature reaches 650 ° C, the diamond will be oxidized in air to 700 ° C to 800 ° C, it will graphite. At low temperatures, these materials are not react. So, as long as the appropriate choice of grinding speed and wet grinding, and adequate supply of grinding fluid, diamond wheel grinding castings, this has been proven in the production practice. Using wet grinding, diamond grinding wheel grinding gray iron grinding than grinding with CBN grinding wheel grinding of gray cast iron is much higher than the (2700) (9600). Generally people thought CBN grinding wheel is a soft material not suitable for grinding low-carbon steel, easy to make wheel then generated debris clogging. However, studies suggest that, vitrified bond CBN grinding wheel can take the the progress wheel speed, to form small debris, with the high-pressure injection grinding fluid to clear the debris, as well as an adequate supply of grinding fluid measures to prevent grinding wheel clogged. Therefore, CBN grinding wheels are low carbon steel (hardness greater than 30HRC) a class of soft materials. However, CBN grinding wheel is not grinding any material. Usually it is not suitable for grinding carbide and carbide steel assembly with a diamond wheel better results.
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