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    • 81. 发明专利
    • MANUFACTURE OF ALUMINA GRINDING WHEEL
    • JPH06278034A
    • 1994-10-04
    • JP7173893
    • 1993-03-30
    • AGENCY IND SCIENCE TECHNYOSHIDA KOGYO KK
    • SHIBAZAKI YASUOODA KIICHIFUKUDA YUSHINAGAI YOSHITAKA
    • B24D3/00B24D3/28
    • PURPOSE:To evenly distribute plate-shape particles so as to improve the sharpness of a grinding wheel by rotating a mixture of binder resin and plate-shape alumina particles at high speed, and orienting the plate-shape alumina particles by means of centrifugal force, thus molding the grinding wheel. CONSTITUTION:Fine plate-shape alumina (alpha-Al2O3) particles are obtained through a hydrothermal treatment and are mixed with a binder resin (binding agent) and this mixture is heated to melt the binder resin and the molten mixture is fed from a feeding portion. While the mixture is being fed, a lower mold is rotated relative to a upper mold and a base body is disposed between the upper mold the lower mold. The molten mixture fed from the feeding portion of the die body held in place is fed into a gap formed between the base body and the upper mold and is forced to collide with each other by a centrifugal force caused by rotation of the lower mold and the alumina particles in the molten mixture are oriented in the vertical direction by this collision. Cooling water is fed into the cooling portion of the lower mold and the oriented alumina particles are sequentially hardened by the binder resin to form an alumina grinding wheel.