| 摘要 |
1,177,191. Abrasive tools. NORTON CO. 19 Feb., 1968 [23 Feb., 1967], No. 7953/68. Heading B3D. [Also in Division C4] A bonded abrasive tool having an abrasive surface layer mounted on a driving centre comprises a plurality of abrasive grains 5 in the surface layer 2 of a predetermined grit size, an inert particulate filler material in the surface layer having particles 13 of approximately the same size as the grains 5, and a metal bond 6 of die cast metal filling the voids between and bonding the abrasive grain and the filler material to the driving centre. The abrasive grains may be of diamond, silicon carbide, alumina or other abrasive material and have a grit size from 80 to 200. The filler material consists of chips of aluminium and antimony. The abrasive grains and filler material may be mixed by tumbling and inserted into the space between a mould 7 having a desired contour 10 and a centre 11, the mould and centre being made of aluminium alloy. The grains and filler material are bonded to the mould and centre by die cast metal comprising an alloy of 65% zinc, with traces of copper and aluminium about 32% cadmium and about 3% silver solder. Thereafter the mould is removed by machining or stripping, the portion 12 of the centre machined away and a bore formed in the centre. |
