JPH0729794B2 - Sheet glass bending and quenching equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bending and quenching device in which bending and quenching and strengthening of sheet glass are performed in the same stage.

(Prior Art) As a method of manufacturing a tempered glass used as a windshield for automobiles, as disclosed in Japanese Patent Publication No. 62-40298, a plate glass heated between upper and lower molds is bent, and then a plate glass is formed by a ring mold. While supporting the periphery of
A method in which cooling air is blown to the surface of the sheet glass from nozzles provided on the molding surfaces of the upper and lower molds to strengthen it, or JP-B-62-18488
The plate glass is pressed against a solid contact material such as a metal cooling plate as disclosed in Japanese Patent Publication No. 63-43324 and Japanese Patent Publication No. 63-43324 to strengthen the cooling.

(Problems to be Solved by the Invention) In the case of the air-cooling method as disclosed in Japanese Patent Publication No. S62-40298, the plate glass is not constrained from after the bending to the rapid cooling, so that the plate glass is easily deformed. This tendency is particularly strong in deep-bent products.

On the other hand, the solid contact method disclosed in JP-B-62-18488 and JP-B-63-43324 can maintain the shape of the plate glass, but it is difficult to uniformly cool the plate glass and the optical distortion becomes large.

(Means for Solving the Problem) In order to solve the above problems, the present invention provides a peripheral edge rapid cooling that rapidly cools a peripheral edge portion of a sheet glass by a solid contact method as a means for rapidly cooling the sheet glass at the same time as or after bending the sheet glass. Means and a central portion quenching means for quenching the central portion of the plate glass with cooling air were provided.

(Function) The peripheral portion of the glass sheet, which requires high precision per die, is rapidly cooled mainly by the solid contact method, and the central portion of the glass sheet, which is required to have high optical characteristics, is rapidly cooled by the air cooling method.

(Example) Below, the Example of this invention is described based on an accompanying drawing.

FIG. 1 is a front view of a sheet glass bending and quenching apparatus according to the present invention, FIG. 2 is a view as seen from the direction of arrows AA in FIG. 1, FIG. 3 is a sectional view of a peripheral edge quenching means of sheet glass, and FIG. 6 is a sectional view showing another embodiment of the peripheral edge quenching means, FIG. 7 is a view showing a bending quenching device in which the molding means and the cooling means in the central portion of the plate glass are separate bodies, and FIG. It is a BB direction arrow line view of FIG.

The bending quenching device 1 is arranged on the downstream side of the heating furnace 2, and the sheet glass G heated to near the softening point by passing through the inside of the heating furnace 2 is loaded into the bending rolls 3 by an in-mold roll 4 of the bending quenching device 1. After carrying out delivery molding and quenching, the carry-out roll 5 ...
The bending quenching device 1 is carried out. Here, for the carry-in rolls 3 ..., a preforming roll may be used in which a heat-resistant sleeve 3b is covered on the outer periphery of a preform-shaped core material 3a of the plate glass G and the sleeve 3b is rotated around the core material 3a. .

Further, the bending and quenching device 1 is provided with a peripheral edge quenching means 6 for quenching the peripheral edge portion of the sheet glass by a solid contact method, and a central portion cooling means 7 for quenching the central portion of the sheet glass with cooling air.

The peripheral edge quenching means 6 is composed of a pair of upper and lower metal ring molds 8 as shown in FIG.
A surface material 8a is attached to the contact surface of the plate glass 8 of 8 and 8. Examples of the surface material 8a include a woven fabric or a felt made of glass fiber, ceramic fiber, carbon fiber, metal fiber, aramid fiber, or the like. Further, the width W1 of the portion of the ring mold 8 which is hung on the peripheral portion of the plate glass G is set to 5 to 20 mm in the case of an ordinary automobile window glass.

The central part quenching means 7 is composed of a convex mold 9 and a concave mold 10 which also serve as a bending forming means for the plate glass G.
Each of 10 has a hollow inside and is connected to a pressure air source, and a cooling air jet hole (nozzle) 11 is formed on the forming surface thereof, and the convex mold 9 can be moved up and down with respect to the frame 13 by a cylinder unit 12. For the concave mold 10, the cylinder unit 14 can be moved up and down with respect to the floor surface.
A concave portion 15 is formed in the mold 10, into which the in-mold conveying rolls 4 ... Enter when rising.

In the above, in order to perform bending and quenching and strengthening of the sheet glass, while the convex mold 9 is positioned above and the concave mold 10 is positioned below, the heated plate glass G is preformed by the carry-in rolls 3 ... Hand over to inner roll 4. Next, the convex mold 9 is lowered and the concave mold 10 is raised to bend the central portion of the plate glass between the convex mold 9 and the concave mold 10, and at the same time, bend the peripheral portion of the plate glass G by the ring molds 8 and 8.

Thereafter, the convex mold 9 and the concave mold 10 are separated from the surface of the plate glass G for a predetermined period while the peripheral edge of the plate glass G is held by the ring molds 8 and the cooling air is jetted from the jet holes 11 ... Quench the department. Convex type 9 for this quenching
It is preferable that the concave mold 10 is oscillated while it is uniformly cooled.

On the other hand, in parallel with the rapid cooling of the central portion of the plate glass G by the convex mold 9 and the concave mold 10, the peripheral portions of the plate glass G are rapidly cooled by the ring molds 8, 8. In order to perform this rapid cooling, the ring mold 8 is pressed against the peripheral edge of the plate glass G with a pressure (500 to 1000 kgf) larger than the press pressure during bending and the heat is forcibly taken from the plate glass. Further, when the plate glass is rapidly cooled, contraction occurs. If this amount of shrinkage increases, it may lead to glass breakage, so it is advisable to loosen the press pressure once during quenching to cancel the shrinkage.

FIGS. 4 to 6 show another embodiment of the peripheral edge quenching means 6, each of which is a combination of the solid contact method and the air cooling method. In the embodiment shown in FIG. Mold 8
Is a square pipe, and the inside is connected to a pressure source.
The cooling air ejected from the glass is supplied to the peripheral edge of the plate glass G through the stainless mesh 17 and the stainless fiber cloth 18. In order to enhance the cooling effect, it is preferable to form a cooling air guide groove 19 on the surface of the ring mold 8 facing the plate glass G.

In the embodiment shown in FIG. 5, the nozzle holes 16 are formed on the side surface of the ring mold 8 and the guide plate 20 guides the cooling air to the surface of the plate glass. In this way, by not directly applying the cooling air to the plate glass G, the optical characteristics of the peripheral portion of the plate glass can be improved. The contact width W1 between the ring mold 8 and the plate glass is 5 to 20 mm as described above.
If the distance W2 between the ring mold 8 and the guide plate 20 is too wide, the cooling of this portion will be insufficient, so the distance W2 is set to about 5 to 10 mm.

Further, the embodiment shown in FIG. 6 is a cooling plate as a solid contact material.
21 and a pipe 22 for performing the air-cooling method are separated.

7 and 8, the embodiment described above is based on the central part quenching means 7.
A convex mold 9 and a concave mold 10 which also serve as a bending and forming means for the plate glass G.
On the other hand, the convex mold 9 and the concave mold 10 are exclusively used for bending, and for rapid cooling of the central portion of the plate glass G, a pair of comb-like quenching devices 23 are provided above and below the plate glass G, respectively. It is arranged so that it can move back and forth, and the bending and quenching and strengthening of the central portion of the sheet glass are performed in separate continuous steps, although they are at the same stage.

In the illustrated example, the apparatus for bending the plate glass in the horizontal state is shown, but the present invention can be applied to an apparatus for bending the plate glass in the vertical state.

(Effect of the invention) As described above, according to the present invention, in performing bending and quenching and strengthening of a sheet glass at the same stage, a solid contact method or a solid contact method and an air cooling method are applied to the edge portion of the sheet glass. As a combination, the central portion of the sheet glass is rapidly cooled by the air cooling method, so that a bending-strengthened glass having excellent molding accuracy and less optical distortion can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of a sheet glass bending and quenching apparatus according to the present invention, FIG. 2 is a view as seen from the direction of arrows AA in FIG. 1, FIG. 3 is a sectional view of a peripheral edge quenching means of sheet glass, and FIG. 6 to 7 are sectional views showing another embodiment of the peripheral edge quenching means, FIG. 7 is a view showing a bending quenching device in which the shaping means and the quenching means in the central portion of the sheet glass are separate bodies, and FIG. It is a BB direction arrow line view of FIG. In the drawings, 1 is a bending quenching device, 6 is a plate glass peripheral portion quenching device, 7 is a plate glass central region quenching device, 8 is a ring mold, 9 is a convex type, 10 is a concave type, 16 is a nozzle hole, 20 is a guide plate, G is flat glass.

Claims (2)

[Claims] 1. An apparatus for bending and tempering a sheet glass between a convex shape and a concave type and quenching and strengthening the sheet glass. The apparatus comprises a peripheral edge quenching means for quenching the peripheral edge portion of the sheet glass by a solid contact method, and a central portion of the sheet glass. A bent quenching apparatus for plate glass, comprising a central quenching means for quenching by cooling air. 2. The peripheral edge quenching means is provided with a hollow member connected to a compressed air source in addition to the solid contact material, a nozzle hole is formed in this hollow member, and cooling air blown out from this nozzle hole is guided by a guide plate. The bending and quenching apparatus for a plate glass according to claim 1, wherein the device is configured to lead to the surface of the plate glass.