Bending apparatus, bending method and curved roller for a glass sheet

Abstract

A glass sheet G, which has been heated to the bending temperature by a heating furnace 12, is preliminary bent in the course of being conveyed to a bending position by a roller conveyer for preliminary bending 20. When the glass sheet thus preliminary bent is put on a press ring at the bending position, the glass sheet is pressed against the bending surface 26 of a mold 24 by upward movement of the press ring 22 to be bent so as to have a desired radius of curvature. After that, the press ring 22 is moved toward an air-cooling / tempering apparatus 16. When the press ring 22 is introduced into a certain tempering position S, cooling air is ejected from an upper blowing head 30 and a lower blowing head 32 toward the glass sheet G to air cool and temper the glass sheet G.

Description

technical field [0001] The present invention relates to a bending forming device and a bending forming method for bending a glass plate, and a bending roller for bending forming. Background technique [0002] For a long time, as the window glass of automobiles, curved glass sheets of various shapes and curvatures have been used. made by extrusion. [0003] The manufacturing apparatus of a curved glass sheet can be roughly divided into an out-of-furnace forming apparatus in which a forming mold is installed outside a heating furnace, and an in-furnace forming apparatus in which a forming mold is installed inside a heating furnace. [0004] In the case of an in-furnace forming device, since the glass plate is formed while the heating temperature is maintained, adverse consequences caused by temperature drop during forming are less likely to occur. In the case of the forming device outside the furnace, since the glass plate is cooled by the air outside the furnace, problems s...

AI Technical Summary

Problems solved by technology

For this reason, it takes time to transfer the bent glass plate from the lower platen to the bending rollers, and it takes time to transfer the glass plate to the air cooling and strengthening device.

In addition, due to heat loss due to contact with the bending roller, the glass plate is cooled before being transported to the air-cooled strengthening device, and there is a problem that it is difficult to perform a good strengthening treatment

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