Stone working – Sawing – Rotary
451542, 451449, 51297, B28D 112
A blade comprises a disc-shaped substrate having a major surface and an outer peripheral edge portion encircling the major surface, and an abrasive grain layer mounted on the outer peripheral edge portion of the substrate. The substrate includes a first disc having a major surface, and a second disc having a major surface which is superposed on that of the first disc. The major surface of the second disc is separated from that of the first disc, thereby defining a clearance between the major surfaces of the first and second discs and correspondingly forming a convex surface region on the outside surface of the substrate. The peripheral portion of the convex surface region is provided with a contact portion where the major surfaces of the first and second discs are slidably in contact with each other. An adhesion inhibitor is applied to the major surfaces of the first and second discs before superposing these major surfaces with each other, and the outer peripheral edge portions of the superposed first and second discs are covered with a mixed powder of abrasive grains and metal powder. The mixed powder is then sintered, thereby forming the abrasive grain layer which is fixed to the outer peripheral edge portions. The first and second discs are then spot-welded together at a plurality of locations between the major surfaces of the first and second discs.
patent: 3023551 (1962-03-01), Osenberg
patent: 3196584 (1965-07-01), Tatko
patent: 3742655 (1973-07-01), Oliver
patent: 4867025 (1989-09-01), Ekloff et al.
patent: 5040341 (1991-08-01), Okinaga
Fasse W. F.
Fasse W. G.
Osaka Diamond Industrial Co.
Rose Robert A.
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