JP2809596B2 - Glass sheet bending machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for forming a glass having a complex curved surface such as a window glass for an automobile.

[0002]

2. Description of the Related Art Conventionally, a curved glass used for a window glass for an automobile, for example, is a gravity bending method in which a heat-softened glass is placed on a frame and the glass is bent down by gravity.
The size of the curved glass, such as the press bending method of pressing and bending with a mold, the gas hearth bending method of bending the sheet glass while floating and moving it with the gas ejected from the gas hearth,
It is properly used depending on the shape and molded.

Among these, the method of bending with a gas hearth has the advantage of high productivity and low cost, but it can be bent freely in the direction perpendicular to the sheet glass transport direction according to the required curvature. On the other hand, bending in the transport direction has not been essentially easy due to its structure.

[0004] As a device for bending in the conveying direction,
No. 10331 is well known, but this device is intended to bend the sheet glass from the bed near the end of the gas hearth furnace with a gradual downward slope, which changes the shape of the gas hearth and its arrangement, and further The shape and arrangement of the cooling bed in the quenching process also need to be greatly changed along the slope, and when changing the curvature of the product or forming single-bent glass only in the direction perpendicular to the normal transport direction, at least inside the heating furnace In addition to replacing the bed from the bed near the end to the cooling bed, it was necessary to arrange the bed horizontally, and in some cases, this gas hearth furnace could not be used.

For the purpose of solving such disadvantages, Japanese Patent Laid-Open Nos. 5-9037 and 6-191867 have been proposed. However, in any case, the bending in the transport direction is basically performed by the same method as in Japanese Patent Publication No. 49-10331, and the shape according to the product from the final gas hearth bed or the bed near the final to the final bed The bed is bent only in the direction perpendicular to the transport direction, and it is necessary to prepare a large number of beds with different shapes, not to mention the shape of the bed. In addition, work such as adjustment was inevitable.

[0006] The present invention has been made in view of such a point, there is no need to prepare a special final gas hearth bed according to the type, it is easy to adjust at the time of switching, a completely different from the conventional composite An object is to provide an apparatus capable of forming bent glass.

[0007]

Means for Solving the Problems The present invention relates to a shape similar to a hearth bed while floating and transferring the glass sheet on a hearth bed having a shape in which the glass sheet is bent in a direction perpendicular to the conveying direction in a gas furnace. In the apparatus that bends into a final bed, the final bed is characterized by having a hearth bed bent in a direction perpendicular to the conveying direction of the glass sheet slightly shaken in the horizontal direction from the conveying direction of the glass sheet. The swing angle is preferably set to 0.1 ° to 0.5 °, and when the radius of curvature in the transport direction is tens of thousands mm or less, the final gas hearth bed must be disposed forward and downward, The angle is preferably set to 0.3 ° or less, and the cooling bed in the next cooling step is also arranged at the front downward, and the inclination angle of the front downward is made substantially equal to the inclination angle of the final bed. When the preferred.

[0008]

[Function] A window glass for an automobile, for example, a door window,
Curved glass such as side glass is required not only to bend in the vertical direction but also bend in the horizontal direction. Its radius of curvature is around 1500 mm in the vertical direction, but 10,000 mm to 50,000 m in the horizontal direction.
The present inventors have focused on the fact that m is large and made the present invention.

In the gas hearth bending, in the case of a single bending bending only in a direction perpendicular to the conveying direction, a plurality of gas hearth beds are arranged, and the shape is gradually inclined from the initially flat bed to the final shape. The beds are arranged so as to have a desired curvature, and a plurality of beds immediately before and including the final bed are arranged at least as beds having the same curvature as the final bed. The bending is performed by using the bending in the direction perpendicular to the conveying direction as the bending in the conveying direction. In this case, the radius of curvature generally required is 15 in the direction perpendicular to the transport direction.
When the swing angle θ with respect to the transport direction in the horizontal direction is smaller than 0.1 ° when the length is about 00 mm, it is difficult to form a bent glass having a desired radius of curvature in the transport direction, for example, tens of thousands mm or less. Exceeds 0.5 °, the gap between the final bed and the immediately preceding bed becomes large, and the glass sheet being transported may come into contact with the bed, which may adversely affect the bending quality. It is better to be in the range of ° to 0.5 °.

When the radius of curvature in the transport direction is relatively large, it is not necessary to dispose the final bed at the front downward, but when it is tens of thousands mm or less, the final gas hearth bed is disposed at the front downward. Then, the lowering of the final bed contributes to further reducing the radius of curvature, and in the case of individual pieces, it is more preferable that the cooling bed in the next cooling step is also lowered forward.

At this time, the inclination angle of the forward fall is 0.3 °.
By this time, the flow of each bed is smooth, but if it exceeds this range, the adjacent portion of each bed becomes steep and may damage the glass sheet.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical sectional view of a main part showing a bending apparatus of the present invention in an embodiment, and FIG. 2 is a plan view of a main part showing a hearth bed and a cooling bed on the downstream side.

The gas hearth furnace 1 is a tunnel-type heating furnace in which a plurality of gas hearth beds are linearly arranged. The upper surface of the gas hearth bed is a flat surface on the upstream side, but is gradually bent in the direction perpendicular to the transport direction, gradually becoming smaller in curvature, and several beds including the final bed _2n on the downstream side are products to be formed. It is bent to the curvature. In addition, a large number of holes are formed in the upper surface so that a high-temperature gas is ejected.

In the present invention, all the beds are connected to the drive chain 3.
Side down a few degrees (lower side in FIG. 2), performs the normal arrangement that allow easy engaged by flight not shown plate glass 5, just before the bed 2 _n-1 to the linear (drive chain 3 2), the final bed 2 _n is swung in the horizontal direction by an angle θ (the angle with respect to the horizontal line H) as shown in FIG. 2, and the downstream side is further lowered forward by an inclination angle φ _1. even the cooling bed 4 ₁ in the next cooling apparatus 4 disposed forwardly downward the downstream side by the inclination angle phi _2.

In such a bending apparatus, the radius of curvature in the direction perpendicular to the direction of transport of the final gas hearth bed is 1250 mm, the swing angle θ is 0.3 °, and the forward fall angle φ ₁ is 0.2 °. When a flat glass sheet 1 having a size of 700 mm × 450 mm is introduced from the upstream side into a cooling bed having a front downward angle φ ₂ of 0.2 °, the gas hearth bed is bent according to a normal gas hearth furnace bending method. The temperature gradually rises as it is levitated and transferred, and it is bent in a direction perpendicular to the transfer direction according to the curved shape of the upper surface of the gas hearth bed.In the final gas hearth bed, further bending in the transfer direction is performed, and It is quenched by the cooling device and strengthened.

The glass obtained in this manner has a radius of curvature of 1244 mm in a direction perpendicular to the transport direction, a radius of curvature of 38406 mm in the transport direction, and has a rubbing amount of 1.0 m.
m and glass suitable for automobiles.
It can be used without adjustment from the upstream side of the single bend gas hearth bed bent to the radius of curvature of mm to the gas hearth bed before the last, without having to replace the final gas hearth bed, adjusting the position Is adjusted by adjusting a support (not shown), and the cooling bed need only adjust the height of the support.

Although the preferred embodiments have been described above, the present invention is not limited to these embodiments, and various applications are possible. The swing angle of the final gas hearth bed varies from 0.1 ° to 0.1 ° depending on the size of the bed so that the gap between the final bed and the bed before the final bed does not exceed 5 mm and the radius of curvature in the transport direction. What is necessary is just to select suitably in the range of 5 degrees.

In the embodiment, both the final gas hearth bed and the cooling bed are disposed at the same inclination angle and the downstream side is lowered forward, but the bending in the transport direction is large and the radius of curvature is 100,000.
If the radius of curvature is smaller than 100,000 mm and the inclination angle of the final gas hearth bed is relatively small, the cooling bed does not necessarily need to be inclined.

[0019]

According to the present invention, compound bending can be performed using a single-bent gas hearth bed, and it is necessary to prepare a special bed according to the product type as the final gas hearth bed. In addition, when the bending curvature in the direction perpendicular to the transport direction before and after the switching is the same at the time of switching, it can be dealt with only by adjusting the position of only the last bed or only the last bed and the cooling bed.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part showing a bending apparatus of the present invention in an embodiment.

FIG. 2 is a main part plan view showing a hearth bed and a cooling bed on the downstream side.

[Explanation of symbols]

Reference Signs List ₁ gas hearth furnace 2 _n-1 , 2 _n gas hearth bed 3 chain 4 cooling device 4 ₁ cooling bed 5 sheet glass

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) C03B 23/035 C03B 27/048

Claims (6)

(57) [Claims] An apparatus for bending and forming a glass sheet into a shape following the hearth bed while floating and transferring the glass sheet on a hearth bed having a shape bent in a direction perpendicular to a conveying direction in a gas furnace. The bed according to claim 1, wherein the hearth bed bent in a direction perpendicular to the sheet glass conveying direction is slightly swung in the horizontal direction from the sheet glass conveying direction. 2. The apparatus for bending a glass sheet according to claim 1, wherein the swing angle in the horizontal direction from the transport direction of the final bed is 0.1 ° to 0.5 °. 3. The apparatus for bending a glass sheet according to claim 1, wherein the final gas hearth bed is disposed with the downstream side being lowered forward. 4. The glass sheet bending apparatus according to claim 3, wherein the final gas hearth bed has a forward inclination angle of 0.3 ° or less. 5. The glass sheet bending apparatus according to claim 3, wherein a cooling bed for the next step is disposed at a position lower than the front from the last gas hearth bed. 6. The apparatus for bending a glass sheet according to claim 5, wherein the inclination angle of the cooling bed at the front is substantially equal to the inclination angle of the final bed.