Abstract: The super abrasive wheel includes a core rotating around a rotation axis and a super abrasive layer bonded to the core. The core has a first surface and a second surface located opposite to the first surface. An annular first protrusion portion protruding in the direction away from the first surface is provided at a portion of the second surface that is surrounded with the super abrasive layer. A reference surface is provided in the second surface on the inside of the first protrusion portion. The height from the reference surface to the first protrusion portion is denoted as A. A top portion having the height B from the reference surface is provided at a portion of the second surface between the first protrusion portion and the super abrasive layer. The height B is greater than the height A.

Abstract: The super abrasive wheel includes a core rotating around a rotation axis and a super abrasive layer bonded to the core. The core has a first surface and a second surface located opposite to the first surface. An annular first protrusion portion protruding in the direction away from the first surface is provided at a portion of the second surface that is surrounded with the super abrasive layer. A reference surface is provided in the second surface on the inside of the first protrusion portion. The height from the reference surface to the first protrusion portion is denoted as A. A top portion having the height B from the reference surface is provided at a portion of the second surface between the first protrusion portion and the super abrasive layer. The height B is greater than the height A.

Abstract: A superabrasive wheel (100, 200) for mirror finishing includes an annular base plate (120, 220) having an annular end surface (121, 221) and a plurality of superabrasive members (110, 210), each having a peripheral end surface (111), arranged along the periphery of the annular base plate (120, 220) at intervals from each other in a circumferential direction and fixed onto the end surface (121, 221) of the base plate (120, 220). Each of the superabrasive members (110, 210) has a flat plate shape, and is so arranged that the peripheral end surface (111) is substantially parallel to the rotary shaft of the superabrasive wheel (100, 200). A surface (113) defined by the thickness of the flat plate shape of each superabrasive member (110, 210) is fixed onto the end surface (121, 221) of the base plate (120, 220). In the superabrasive members (110, 210), superabrasive grains are bonded by a binder of a vitrified bond.

Abstract: A superabrasive wheel (100, 200) for mirror finishing comprises an annular base plate (120, 220) having an end surface (121, 221) and a plurality of superabrasive layers (110, 210), each having a peripheral end surface (111), arranged along the peripheral direction of the annular base plate (120, 220) at intervals from each other and fixed onto the end surface (121, 221) of the base plate (120, 220). Each of the plurality of superabrasive layers (110, 210) has a flat plate shape, and is so arranged that the peripheral end surface (111) is substantially parallel to the rotary shaft of the superabrasive wheel (100, 200). A surface (113) defined by the thickness of the flat plate shape of each of the plurality of superabrasive layers (110, 210) is fixed onto the end surface (121, 221) of the base plate (120,220). In the superabrasive layers (110, 210), superabrasive grains are bonded by a binder of a vitrified bond.

Abstract: 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.