Overpressure-assisted gravity bending method device suitable therefor

A bending and gravity technology, applied in the device field of this method, can solve the problems of long bending time and increased production cost, and achieve the effect of reducing damage risk and high efficiency

Active Publication Date: 2017-05-31
SAINT-GOBAIN GLASS FRANCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The disadvantages of the traditional gravity bending method are the high bending temperature required to effectively soften the glass sheet and the long bending time required until the sheet has its desired shape
Both lead to higher production costs

Method used

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  • Overpressure-assisted gravity bending method device suitable therefor
  • Overpressure-assisted gravity bending method device suitable therefor
  • Overpressure-assisted gravity bending method device suitable therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0064] figure 1The device according to the invention is shown during the method according to the invention for bending a glass pane I. In the initial state a flat glass plate 1 is placed on the frame-like support surface 2 of the gravity bending model 1 ( figure 1 a). As usual in gravity bending, the glass pane I is heated to a bending temperature which at least corresponds to the softening temperature. Subsequently, the softened glass sheet 1 is pressed against the support surface 2 under the influence of gravity ( figure 1 b).

[0065] According to the invention, gravity bending is assisted by an upper forming tool 3 which generates an overpressure on the upwardly directed surface O of the glass pane 1 facing away from the support surface 2 . The upper forming tool 3 is a bell-shaped or cup-shaped tool with a cavity 5 facing the glass sheet 1. The upper forming tool 3 is brought into contact with the upper surface O of the glass pane 1 via a surrounding sealing lip, so ...

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Abstract

The invention relates to a device for bending at least one glass pane (I), at least comprising a gravity bending mold (1), which has a supporting surface (2), which is suitable for arranging at least one glass pane (I) thereon, an upper shaping tool (3) arranged opposite the supporting surface (2), which upper shaping tool is suitable for producing an overpressure on the surface (O) of the at least one glass pane (I) arranged on the supporting surface (2) that faces away from the supporting surface (2), wherein the shaping tool (3) has a cover (8), which forms a cavity (5) open toward the gravity bending mold (1), and is equipped with a sealing lip (7), which is arranged on an edge segment (4) of the cover (8), for contacting the surface (O) of the at least one glass pane (I) that faces away from the supporting surface (2), and wherein the shaping tool (3) is equipped with means for introducing a gas into the cavity (5) in order to produce the overpressure.

Description

technical field [0001] The invention relates to an overpressure-assisted gravity bending method for glass sheets, a device suitable for the method, and the use of an upper forming tool for generating an overpressure in the gravity bending method. Background technique [0002] Mounting glazing for motor vehicles typically has a curvature. A widely used method for bending glass sheets is so-called gravity bending (also known as gravity bending or sag bending). In this case, the glass pane, which is flat in the initial state, is arranged on the support surface of the bending form. Thereafter, the plate is heated to at least its softening temperature, so that the plate bears against the support surface under the influence of gravity. In this way, the shape of the glass pane can be influenced by the configuration of the support surface. The final bend is achieved by gravity bending. Such a method is known, for example, from document GB 813069 A. However, multi-stage bending ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B23/035
CPCC03B23/0355C03B23/0093C03B23/0252C03B23/0258Y02P40/57Y02P40/50C03B23/0256
Inventor J-M.勒尼M.巴尔杜因G.沙尔
Owner SAINT-GOBAIN GLASS FRANCE
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