Systems and methods for thermally controlling warp

Patent metadata

Field	Value
Publication number	US-11136255-B2
Application number	US-201615181706-A
Country	US
Kind code	B2
Filing date	Jun 14, 2016
Priority date	Jun 16, 2015
Publication date	Oct 5, 2021
Grant date	Oct 5, 2021

Abstract

Embodiments disclosed herein include systems and methods for controlling material warp that include placing the shaped mold in a heating device, forming a glass material into a shaped mold, and cooling the glass material and the shaped mold to a predetermined viscosity of the glass material. Some embodiments include, a predetermined time prior to removing the glass material and the shaped mold from the heating device, holding the glass at the mold in the heating device where the heating device temperature is substantially equal to mold and glass temperature just prior to exiting to ambient temperature. Some embodiments include removing the glass material and the shaped mold from the heating device to further cool the glass material and the shaped mold at ambient temperature, where after removing the glass material and the shaped mold from the heating device, the glass material will exhibit controlled or desired material warp.

First claim

What is claimed is:

1. A method for controlling material warp, comprising:
placing a glass material and shaped mold in a heating device to heat the glass material and the shaped mold;
forming the glass material into a shape of the shaped mold;
cooling the glass material and the shaped mold to a predetermined viscosity of the glass material;
holding, for a predetermined time prior to removing the glass material and the shaped mold from the heating device, the glass material and the shaped mold in the heating device where a temperature of the heating device is substantially equal to a temperature of the shaped mold and the glass material just prior to exiting the heating device into ambient temperature; and
removing the glass material and the shaped mold from the heating device and unloading the glass material from the shaped mold such that the glass material cools to the ambient temperature separately from the shaped mold, wherein after removing the glass material and the shaped mold from the heating device, the glass material will exhibit a desired material warp.

2. The method of claim 1 , wherein the shaped mold comprises a center section and an edge, wherein the glass material is heated to create a predetermined temperature differential that is between about 5 degrees Celsius and about 50 degrees Celsius greater than the center section when the glass material is conformed to the shaped mold.

3. The method of claim 1 , wherein the glass material and the shaped mold are cooled to a temperature that is about 0 degrees Celsius to about 50 degrees Celsius greater than a temperature corresponding to about 10 13.2 Poise glass viscosity when the glass material and the shaped mold are removed from the heating device.

4. The method of claim 1 , wherein the glass material comprises a three dimensional glass material with a minimum bend radius of about 2 millimeters to about 10 millimeters.

5. The method of claim 1 , wherein the glass material comprises a three dimensional glass with a minimum bend radius from about 10 millimeters to about 1000 millimeters.

6. The method of claim 1 , wherein a viscosity of the glass material upon exiting from the heating device to the ambient temperature is greater than about 10 11.81 Poise.

7. A method for controlling material warp, comprising:
forming a glass material into a shape of a shaped mold, wherein the shaped mold and the glass material are placed into a heating device, wherein the shaped mold comprises a center section and an edge, wherein the glass material and the shaped mold are heated to create a predetermined temperature differential between the edge and the center section;
cooling the glass material and the shaped mold to a predetermined viscosity of the glass material, wherein the predetermined temperature differential between the edge and the center section is maintained;
further cooling, for a predetermined time prior to removing the glass material and the shaped mold from the heating device, the glass material and the shaped mold such that a temperature of the shaped mold is substantially equal to a temperature of the heating device; and
removing the glass material and the shaped mold from the heating device and unloading the glass material from the shaped mold such that the glass material cools to ambient temperature separately from the shaped mold, wherein after removing the glass material and the shaped mold from the heating device, the glass material will exhibit a desired material warp.

8. The method of claim 7 , wherein the edge is heated to a temperature that is between about 5 and 50 degrees C. greater than the center section when glass is being conformed to the shaped mold, and between about 0 degrees Celsius and about 25 degrees Celsius greater than the center section upon exiting from the heating device to the ambient temperature.

9. The method of claim 7 , wherein the glass material and the shaped mold are cooled to a temperature that is about 0 degrees Celsius to about 50 degrees Celsius greater than a temperature corresponding to about 10 13.2 Poise glass viscosity.

10. The method of claim 7 , wherein the glass material comprises a three dimensional glass with a bend radius of about 5 millimeters to about 10 millimeters.

11. The method of claim 7 , wherein the predetermined viscosity is greater than about 10 11.81 Poise and wherein the predetermined viscosity is reached by cooling the glass material to less than about 50 degrees Celsius above an annealing point.

Assignees

• Corning Inc

Inventors

• Bisson Antoine Gaston Denis
• Mcnelis Kevin Patrick
• Rai Rohit
• Ridge John Richard
• Ukrainczyk Ljerka

Classifications

• C03B23/0307 Primary

  Press-bending involving applying local or additional heating, cooling or insulating means · CPC title

• C03B23/0235 Primary

  involving applying local or additional heating, cooling or insulating means · CPC title

• C03B23/0302

  between opposing full-face shaping moulds · CPC title

• C03B23/0352

  by suction or blowing out for providing the deformation force to bend the glass sheet · CPC title

• Y02P40/57

  Improving the yield, e-g- reduction of reject rates · CPC title