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Thermal edge finishing

An edge and finishing technology, applied in the direction of manufacturing tools, laser welding equipment, welding equipment, etc., can solve problems such as high residual stress and the influence of glass plate strength

Inactive Publication Date: 2010-02-10
CORNING INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Laser edge finishing is a clean method, but laser finishing can cause high residual stress at the edge and can negatively affect the strength of the glass sheet
Therefore, there are quality issues in downstream processing when laser edge finishing is employed

Method used

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Embodiment Construction

[0025] In the following detailed description, for purposes of illustration and not limitation, exemplary embodiments illustrating specific details are given in order to provide a thorough understanding of the present invention. It will be apparent to those of ordinary skill in the art, having the benefit of this description, that the invention may be practiced in other embodiments than those detailed herein. Additionally, descriptions of well-known devices, methods, and materials may be omitted so as not to obscure the description of the present invention.

[0026] The inventive method includes providing a glass sheet 50 having at least one cut edge 51 comprising sharp corners 52 and 53 ( figure 1 ), and the edges are rounded using thermal edge finishing techniques such as lasers ( Figure 2-3C ), forming a uniformly rounded edge 51A ( Figure 1A ), symmetrical edges (such as the edge 51B formed by two rounded corners and a straight line) ( Figure 1B ), asymmetrical edges ...

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Abstract

A thermal edge finishing process includes preheating at least one cut edge of a glass sheet, laser finishing the edge to a single full continuous radius from a position orthogonal to the edge and in-plane with the glass sheet while continuing to heat the glass, and localized annealing of the edge to reduce residual stress from the laser / thermal treatment of the edge. By the present process, edgestress is reduced considerably, such as to less than 3000 psi, and more preferably to less than 2500 psi, and to as low as 1000 psi in the first 1 mm along the treated edge.

Description

technical field [0001] This period involves the hot edge finishing and annealing of glass sheets, and more specifically: laser finishing of the edges of glass sheets followed by annealing to reduce residual tensile stress along said edges and therefore reduce downstream defects and quality issues. Background technique [0002] One known method of mechanically dividing and finishing a glass sheet requires a cutting process such as a scoring wheel to mechanically score and mechanically divide by bending the glass sheet to propagate cracks, and an edge finishing process such as polished. Mechanical scribing is usually performed in a wet process. Glass debris from mechanical scoring, splitting and edge finishing adheres to the surface of the glass sheet. The glass sheet then needs to be cleaned to eliminate contamination from glass debris on the surface of the glass sheet. This requires cleaning the glass sheet after the scoring, breaking and edge finishing process, adding t...

Claims

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Application Information

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IPC IPC(8): B23K26/00
CPCB23K26/0081B23K26/0736C03B25/025C03B29/025C03C23/0025Y02P40/57
Inventor N·D·卡瓦拉奥三世Z·-S·常G·N·库德瓦小野俊彦L·乌克兰采克S·S·朱彼
Owner CORNING INC
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