Patent ID: 9028296
Filing Date: 2015-05-12
Classification: B24B,Y10T

Abstract:
1. A method of shaping a glass sheet comprising a first glass-sheet surface, a second glass-sheet surface opposing the first glass-sheet surface, a thickness defined between the first glass-sheet surface and the second glass-sheet surface, and an edge portion comprising an end surface comprising a median crack surface, wherein the first glass-sheet surface and the end surface intersect along a first edge of the edge portion, the second glass-sheet surface and the end surface intersect along a second edge of the edge portion, and the median crack surface extends from either the first or second edge of the edge portion along the end surface, the method comprising the steps of: (I) removing a first portion of the glass sheet comprising the first edge with at least one rotating cup wheel, thereby forming a first bevel surface between the first glass-sheet surface and the end surface; (II) removing a second portion of the glass sheet comprising the second edge with the at least one rotating cup wheel, thereby forming a second bevel surface between the second glass-sheet surface and the end surface; and then (III) removing a third portion of the glass sheet comprising a remainder of the end surface with a rotating grooved wheel to form an apex surface between the first and second bevel surfaces, wherein step (I) and/or step (II) removes the median crack surface, and wherein steps (I), (II) and (III) provide the glass sheet with a shaped edge that exhibits a probability of failure of less than 5% at an edge stress of 135 MPa.