Tiny-crack-free curved glass hot-wire cutting method based on thermal shield membrane

Abstract

The invention relates to a method for hot wire cutting of curved glass without microcracks based on a heat shielding film, which specifically comprises the following steps: (1) building a hot wire cutting device, fixing the curved glass on the mold of the hot wire cutting device, and Mark the cutting position of the prefabricated crack on the surface; (2) Set the heat shielding film symmetrically on both sides of the prefabricated crack cutting position of the curved glass; (3) Move the hot wire directly above the prefabricated crack of the curved glass, and heat the hot wire to the set temperature , and then control the hot wire to move along the expected trajectory and cut cracks on the curved glass. Compared with the prior art, the present invention utilizes the thermal shielding film to control the temperature field generated by the hot wire on the glass surface. The temperature field on the glass surface changes stably and is not easily affected by external environmental factors. The straightness of the cracks cut by wire is higher, which meets the cutting requirements of glass lenses with higher precision requirements.

Description

technical field [0001] The invention relates to the technical field of glass processing, in particular to a hot wire cutting method for curved glass without microcracks based on a heat shielding film. Background technique [0002] Existing glass cutting technology is divided into four types: diamond cutting, water jet cutting, laser fusion cutting and laser thermal stress cutting. For hard and brittle materials such as glass, the edge quality of diamond cutting is relatively rough, and there are macroscopic defects such as small cracks on the surface. Water jet cutting glass generally has the advantages of large cutting thickness, small cutting gap, and high efficiency, but it needs to be strictly controlled during processing. Pressure and Cutting speed to achieve better cutting quality. For ultra-thin curved glass, the pressure generated by water jet cutting can easily cause the glass to break, and the edge quality is difficult to meet the requirements. The glass section ...

AI Technical Summary

Problems solved by technology

Processing technologies such as diamond cutting, water jet cutting and laser cutting cannot meet the non-destructive cutting processing requirements of special glass lenses due to cross-sectional defects and cracks

[0003] Although ordinary resistance wire thermal stress cutting can cut glass lenses with smooth cross-section and no microcracks, the temperature field of the glass surface is easily disturbed by the surrounding environmental factors during cutting and becomes unstable, resulting in uncontrollable cracks. There are micro-cracks in the section, and the straightness cannot meet the high-level requirements

Chinese patent CN 105884186A discloses a method for cutting and processing glass lenses without micro-crack thermal resistance wires. The heat-generating thermal resistance wires are fixed on a three-axis translation platform, and the glass lenses to be processed are fixed on the platform. Keep a certain distance between the resistance wire and the glass, so that a stable and changing thermal stress is generated inside the glass to achieve the purpose of cutting the glass lens. Use the motion control card to adjust the processing parameters to cut the thermal resistance wire of the glass lens. The surface temperature field is susceptible to instability caused by the interference of surrounding environmental factors, resulting in micro-cracks in the glass section

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