Patent ID: 8366520
Filing Date: 2013-02-05
Classification: B24D

Abstract:
1. A centerless grinding wheel comprising an outer annular layer of a molded superabrasive composition selected from a group consisting of diamond and cubic boron nitride, the outer annular layer extending contiguously from one axial end of the wheel to an opposite axial end of the wheel and a non-abrasive center core bonded to and supporting said outer layer, wherein the axial length of said wheel is at least four inches and wherein the entire radially outwardly facing surface of the outer annular layer of the wheel is seamless from one axial end to the opposite axial end and is formed from particulate in a single molding cycle that reduces to substantially zero, and makes substantially uniform across the radially outwardly facing surface and through the thickness of the outer annular layer, the outer annular layer's porosity by mechanical compression of, and simultaneous application of a vacuum to, the superabrasive composition while the superabrasive composition is at an elevated temperature in a range of about 300 to about 700 degrees F.