Grinding wheel for shaping flat glass

Patent metadata

Field	Value
Publication number	US-9649747-B2
Application number	US-201214343609-A
Country	US
Kind code	B2
Filing date	Aug 14, 2012
Priority date	Sep 9, 2011
Publication date	May 16, 2017
Grant date	May 16, 2017

Abstract

A grinding wheel is suited for shaping glass, notably glass that is less than or equal to 4 mm thick. This grinding wheel has at least one abrasive portion formed of at least one metal binder and of diamonds distributed in the binder. The binder has a Rockwell B hardness of between 95 and 105 and is tungsten-based. The diamonds have a size of between 75 and 95 μm and a concentration of between 2.2 ct/cm 3 and 2.64 ct/cm 3 . Glass, in particular for shaping motor-vehicle glazing units, can be shaped with this grinding wheel, making it possible to achieve travel speeds greater than or equal to 30 m/min.

First claim

The invention claimed is:

1. A grinding wheel, comprising:
at least one abrasive portion comprising at least one metallic binder and diamonds distributed in the metallic binder,
wherein the metallic binder comprises:
from 58 to 75% by weight of tungsten;
from 30 to 37% by weight of bronze, wherein the bronze comprises from 75 to 85% by weight of copper and from 15 to 25% by weight of tin;
from 0.5 to 5% by weight of chrome; and
from 0.5 to 5% by weight of nickel,

wherein the metallic binder has a Rockwell B hardness of between 95 and 105, and
wherein the diamonds have a size of between 75 and 95 μm and a concentration of between 2.2 ct/cm 3 and 2.64 ct/cm 3 .

2. The grinding wheel of claim 1 , configured for shaping glass that is less than or equal to 4 mm thick, and/or configured for high-speed shaping.

3. The grinding wheel of claim 1 , wherein the diamonds are coated with titanium.

4. A method for manufacturing the grinding wheel of claim 1 , the method comprising:
producing a mixture of the metallic binder and diamonds;
heating the mixture to high temperature;
pressurizing the mixture; and
removing an assembly comprising the metallic binder incorporating the diamonds in a form of a grinding wheel from a mold.

5. A method for shaping glass, the method comprising:
grinding a sheet of glass with the grinding wheel of claim 1 at a shaping travel speed greater than or equal to 30 m/min.

6. The method of claim 5 , wherein a ratio between a rotation speed of the grinding wheel and the shaping travel speed is between 60 and 180.

7. A method for manufacturing a glazing unit, the method comprising:
grinding a glazing unit with the grinding wheel of claim 1 at a shaping travel speed greater than or equal to 30 m/min.

8. A device, comprising the grinding wheel of claim 1 .

9. The grinding wheel of claim 1 , configured for shaping glass that is less than or equal to 2.6 mm thick.

10. The method of claim 7 , wherein the glazing unit is a windshield, roof, or side window of a motor vehicle.

11. The method of claim 4 , wherein heating the mixture comprises heating to a temperature of higher than 800° C. and pressurizing to several bar.

Assignees

• Bureloux Dominique
• Dumenil Thierry
• Wery Sebastien
• Girod Adeline
• Tunstall John
• Saint Gobain

Inventors

• Bureloux Dominique
• Dumenil Thierry
• Wery Sebastien
• Girod Adeline
• Tunstall John

Classifications

• B24D5/00

  Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor · CPC title

• B24B9/10

  of plate glass · CPC title

• B24D9/10

  with suction means for securing the material · CPC title

• C22C26/00

  Alloys containing diamond {or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes} · CPC title

• B24D3/06 Primary

  metallic {or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements} · CPC title