| 摘要 |
PROBLEM TO BE SOLVED: To provide a grinding wheel capable of attaining grinding efficiency at relatively low cost and increasing a grinding wheel life or a dressing interval. SOLUTION: Boron carbide abrasive grains included in the grinding wheel structure of a grinding wheel 10 for ball grinding (grinding wheel for low-speed grinding), in spite of their properties of low level of thermostability, present completely no problems in a ball grinding because the ball grinding is low-speed grinding at a relative grinding speed to the material-to-be-ground of 10 m/sec. or less, so that the heat generated at a grinding point is not so high. With their advantageous properties of high hardness next to super-abrasive grains such as diamond and CBN, even if they are used for grinding a ball made of grinding-resistant material such as stainless steel or a ceramic ball of high- hardness, their grinding life or dressing interval can be increased more than conventional grinding wheels for grinding that uses general abrasive grains. Furthermore, boron carbide abrasive grains are roughly one-tenth of super- abrasive grains in price, therefore the grinding wheel that uses boron carbide abrasive grains is relatively more inexpensive than the one that uses super- abrasive grains, thus it is possible to attain grinding at low cost.
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