| 摘要 |
1,174,096. Abrasive wheels. N. KUMAGAI. 16 Nov., 1966 [16 Nov., 1965], No. 38887/66. Heading B3D. [Also in Division C4] A method for producing a graphite-bonded grinding wheel for precision grinding comprises thoroughly mixing abrasive grains with a bonding material composed of from 40 to 60% by weight of finely-divided graphite and from 60 to 40% by weight of a clay mixture comprising from 30 to 70% by weight of kaolin and from 70 to 30% by weight of montmorillonite, adding from 3 to 10% by weight of water to the resulting mixture of abrasive grains and bonding material, pressure moulding the resulting wet mixture to form a green wheel, heating the green wheel in a graphite saggar in an inert atmosphere at a temperature from 850‹ to 950‹ C., thereby producing a sintered wheel containing micropores, and impregnating the micropores with a lubricant, e.g. stearic acid. |
