Method for improving strength of glass

Abstract

The invention discloses a method for improving strength of glass. The method comprises the following steps of (a) enabling laser beams emitted by a CO2 laser (1) to pass through a beam expanding collimator to obtain parallel beams (12); (b) dividing the parallel beams (12) into an upper beam (13) and a lower beam (14) by a semi-transparent and semi-reflective mirror (3); (c) enabling the upper beam (13) to pass through an upper dynamic focusing mirror (4) to obtain an upper converging beam (15) and enabling the lower beam (14) to pass through a lower dynamic focusing mirror (6) to obtain a lower converging beam (16); (d) reflecting the upper converging beam (15) through an upper vibrating mirror (5) to obtain an upper light spot which aligns to the upper part of the edge of glass (9) to be treated, and reflecting the lower converging beam (16) through a lower vibrating mirror (7) to obtain a lower light spot which aligns to the lower part of the edge of glass (9) to be treated; and (e) adjusting the moving speed of a glass moving platform (8), respectively treating the four edges of the glass so as to form a glass plate with improved strength. The method disclosed by the invention has the advantages that the laser beams emitted by the CO2 laser (1) are divided into two paths for respectively scanning the upper seamed edges and the lower seamed edges of the edges of the cut glass, so that microcracks at the edges of the glass can be eliminated and further the strength of the glass can be improved.

Description

technical field [0001] The invention relates to a glass post-treatment process, in particular to a method for improving glass strength. Background technique [0002] The theoretical strength of glass is high, but the strength is low in actual use. The reason is that in addition to the strength reduction caused by glass surface defects and microcracks, edge damage is one of the important reasons for the reduction in glass strength, especially Various defects formed on the edge of the glass after mechanical cutting of flat glass, including chipping, cracks, cracks, and micro-cracks that cannot be seen by the naked eye; these defects are affected by mechanical external force, thermal stress, and water vapor erosion. It will cause damage to the glass; therefore, it is necessary to process the edge of the cut flat glass to eliminate defects and improve the strength of the flat glass; the usual treatment method is to mechanically grind and polish the edge of the cut glass , not o...

AI Technical Summary

Problems solved by technology

[0002] The theoretical strength of glass is high, but the strength is low in actual use. The reason is that in addition to the strength reduction caused by glass surface defects and microcracks, edge damage is one of the important reasons for the reduction in glass strength, especially Various defects formed on the edge of the glass after mechanical cutting of flat glass, including chipping, cracks, cracks, and micro-cracks that cannot be seen by the naked eye; these defects are affected by mechanical external force, thermal stress, and water vapor erosion. It will cause damage to the glass; therefore, it is necessary to process the edge of the cut flat glass to eliminate defects and improve the strength of the flat glass; the usual treatment method is to mechanically grind and polish the edge of the cut glass , not only low efficiency but also basically can not solve the strength problem; the current more advanced treatment method is to use laser irradiation to increase the strength of the glass. Among the published related patents, the patent No. 200910272606. Intensity method", the invention patent uses CO2 laser beam to irradiate the side of the glass edge from the horizontal direction, so that the spot is in the center of the side of the glass edge, and the glass can be eliminated by adjusting the laser power and spot size, as well as the moving speed of the glass to be processed. The micro-cracks on the edge are used to improve the strength of the glass; after the glass is cut, there are a lot of defects in the edge area, which should be the key area of ​​laser irradiation, and the heat conduction path of the edge area itself is more than that in the middle of the side, and the heat dissipation is more than that of the side. In the middle of the side, it is reasonable to give more laser energy to the edge area, but the invention patent uses a defocused spot with a large spot area, and its energy is Gaussian distributed. The energy in the center of the spot is the highest, and it decreases away from the center. The temperature required in the edge area must increase the laser power, which will cause the local temperature in the center of the side to be too high, and the glass is easy to ablate or burst

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