Glass sheets and methods of shaping glass sheets

Patent metadata

Field	Value
Publication number	US-9630290-B2
Application number	US-201514699020-A
Country	US
Kind code	B2
Filing date	Apr 29, 2015
Priority date	Aug 30, 2012
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

Methods of shaping a glass sheet each include a step of removing a first portion of the glass sheet to form a first beveled surface. The methods further include the step of removing a second portion of the glass sheet to form a second beveled surface. The methods still further include the step of removing a third portion of the glass sheet comprising a remainder of an end surface of an edge portion of the glass sheet. In further examples, glass sheets are also provided with a first bevel surface intersecting a first glass-sheet surface and an apex surface, and a second bevel surface intersecting a second glass-sheet surface and the apex surface. The glass sheet exhibits a probability of failure of less than 5% at an edge stress of 135 MPa.

First claim

What is claimed is:

1. A glass sheet comprising:
a first glass-sheet surface;
a second glass-sheet surface opposing the first glass-sheet surface with a thickness defined between the first glass-sheet surface and the second glass-sheet surface; and
an edge portion including a first bevel surface intersecting the first glass-sheet surface and an apex surface, and a second bevel surface intersecting the second glass-sheet surface and the apex surface, wherein the first and second bevel surfaces are beveled with a grinding wheel,
wherein the glass sheet exhibits a probability of failure of less than 5% at an edge stress of 135 MPa.

2. A glass sheet comprising:
a first glass-sheet surface;
a second glass-sheet surface opposing the first glass-sheet surface with 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,
wherein the median crack surface is removed with a grinding wheel by (I) removing a first portion of the glass sheet comprising the first edge, 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, 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, thereby forming an apex surface between the first and second bevel surfaces, wherein step (I) and/or step (II) removes the median crack surface, and
wherein the glass sheet exhibits a probability of failure of less than 5% at an edge stress of 135 MPa.

3. The glass sheet of claim 2 , wherein the median crack surface extends less than or equal to 15% of the thickness of the glass sheet.

Assignees

• Corning Inc

Inventors

• Venkatachalam Siva
• Wang Liming

Classifications

• B24B27/0076 Primary

  grinding machines comprising two or more grinding tools · CPC title

• B24B9/107

  for glass plates while they are turning · CPC title

• B24B9/10 Primary

  of plate glass · CPC title

• B24B1/00

  Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes · CPC title

• B24B7/242

  for plate glass · CPC title