Production technology for hot bending of bent glass

Abstract

A production technology for hot bending of bent glass comprises two specific steps, namely, glass sheet preprocessing and quick hot bending of glass; the specific glass sheet preprocessing technology comprises steps as follows: a large sheet of raw glass material is cut into small glass sheets, chemical tempering is performed after CNC (computer numerical control) edge polishing molding, and then ultrasonic cleaning is performed; in the step of quick hot bending of the glass, small cleaned and tempered sheets are sent into a preheating device by a conveying device for preheating, then upper and lower modules are heated, the small tempered sheets are sent into a mold cavity, then the upper and lower modules are combined and perform continuous pressurization for a preset time, finally, slow cooling is performed in the mold cavity, the upper and lower modules are separated after water cooling, and the molded bent glass is taken out. The production technology has the advantages of short molding time, high molding precision, low energy consumption, high yield, low cost and diversified appearance.

Description

technical field [0001] The invention relates to the field of glass deep processing, in particular to a production process for hot bending of curved glass. Background technique [0002] The hot bending production technology of glass is the field of deep processing technology. It uses one-time forming flat glass as the raw material, and realizes different bending shapes by bending the glass plate by gravity. Among them, the method of bending the glass plate by gravity includes supporting the glass plate on a curved frame or mold close to the final shape, then sending the glass plate into a heating furnace for heating, and finally the glass plate is softened by its own gravity to make its edge Steps such as gradually fitting with a curved frame or mold to bend into a specified shape; the method of pressing a curved glass sheet includes heating and softening the glass sheet, sending the glass sheet into the forming area through a horizontal conveying device, and setting it on a ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the glass plate must be bent at a very high bending temperature, and the edge wrinkle problem is solved by gravity in the preliminary forming stage before press forming, resulting in unstable quality control; at the same time, due to the The punch and die for compression molding must operate in a high-temperature bending chamber. The punch and die are prone to deformation, which makes it difficult to control the matching of the punch and die. There are high requirements for the temperature resistance of the mold, which makes This method is only suitable for compression molding in the furnace but not for compression molding outside the furnace, and has certain limitations in application.

[0006] Although the above-mentioned method of bending the glass plate adopts the heating and bending process, the high temperature of the convex and concave molds makes the product gradually coincide with the lower concave mold under the action of its own weight and the convex mold descends to obtain the formed product as the temperature increases. The disadvantage is that the molding time is long and the shape will have different degrees of indentation

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