Method for increasing compressive strength of cut toughened glass

Abstract

The invention discloses a method for increasing the compressive strength of cut toughened glass, characterized by corroding the edge of the cut toughened glass through using a chemical corrosive agent, wherein, the chemical corrosive agent is a hydrofluoric acid solution. According to the invention, by processing the cut edge of the cut toughened (tempered) glass through chemical corrosion, the glass edge defect point (point breakage, edge breakage) is narrowed down from 0.05 mm to less than 0.01 mm, the edge sawtooth turns into smooth, the edge appearance turns into uniform regular crystals from irregular serration, thus the microstructure of the toughened glass edge is changed, the crushing stress thin spots are eliminated, the consistency of the compressive strength is achieved, and the glass strength reaches more than 350 MPa. By adopting the method of chemically corroding the edge of the cut toughened glass to increase the compressive strength, the advantages of realization of sheet process, high efficiency, greatly reduced operation staff, and high yield rate are achieved, thus the invention has huge advantages of production cost, and realizes the sheet process of the toughened (tempered) glass.

Description

technical field [0001] The invention relates to a glass processing technology, in particular to a method for increasing the compressive strength of tempered glass after cutting. Background technique [0002] At present, taking the production of COVER LENS in the chemically tempered (also known as strengthened) glass industry as an example, small pieces of glass are chemically tempered after cutting, and the three-point bending strength can reach more than 350MPa, while large pieces of glass are chemically tempered and then cut into small pieces. There are many collapse points, forming weak points of compressive stress, which greatly reduces the compressive strength of the glass, and the three-point bending strength is reduced to below 200Mpa, which cannot meet the needs of customers at all, so it is completely limited to the small piece process, so production efficiency, production The yield rate is greatly restricted, and the production cost remains high, which has brought ...

AI Technical Summary

Problems solved by technology

[0002] At present, taking the production of COVER LENS in the chemically tempered (also known as strengthened) glass industry as an example, small pieces of glass are chemically tempered after cutting, and the three-point bending strength can reach more than 350MPa, while large pieces of glass are chemically tempered and then cut into small pieces. There are many collapse points, forming weak points of compressive stress, which greatly reduces the compressive strength of the glass, and the three-point bending strength is reduced to below 200Mpa, which cannot meet the needs of customers at all, so it is completely limited to the small piece process, so production efficiency, production The yield rate is greatly restricted, and the production cost remains high, which has brought great troubles to the entire industry. The industry's large investment in increasing production capacity cannot change the shortage of cover lenses.

Existing tempered glass mobile phone cover lens can only be made by small single-grain manufacturing process, which has low efficiency, many operators, and low process yield

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