JPH08151221A - Device for bending and shaping plate glass - Google Patents

Abstract

PURPOSE: To provide a device capable of shaping complex bent glass completely different from conventional bent glass, not requiring preparation of a specific bed corresponding to a grade, being readily adjusted in change of grades. CONSTITUTION: In a gas hearth shaping device, the final bed slightly swings a hearth bed bent in the direction perpendicular to the transportation direction of plate glass from the transportation direction of the plate glass to the horizontal direction. The swinging angle is preferably 0.1 deg. to 0.5 deg.. When the curvature radius of the transportation direction is equal to or smaller than tens of thousands mm, the final gas hearth bed requires arrangement lowering forward and the angle is preferably <=0.3 deg.. The cooling bed in the following cooling process is arranged with lowering forward. The angle of the lowering forward is preferably approximately equal to that of the final bed.

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 glass having a complex curved surface such as window glass for automobiles.

[0002]

2. Description of the Related Art Conventionally, curved glass used for window glass for automobiles is a gravity bending method in which a softened glass is placed on a frame, and the glass is suspended by gravity and bent.
The size of curved glass, such as the press bending method of pressing and bending with a mold, the gas hearth bending method of bending while flat plate glass is floated and moved by the gas blown from the gas hearth,
It is formed by being used properly according to the shape.

Among them, the method of bending by gas hearth has a high productivity and has an advantage that it can be produced at a low cost, but it can be bent freely in the direction perpendicular to the conveying direction of the sheet glass according to the required curvature. On the other hand, bending in the conveying direction was not inherently easy due to its structure.

Japanese Patent Publication No. Sho 49-
No. 10331 is well known, but this device bends the sheet glass from the bed near the end of the gas hearth furnace by gradually inclining downward, and this inclination changes the shape of the gas hearth and its arrangement method, and further The shape of the cooling bed and its arrangement in the quenching process also need to be changed significantly along the slope, and when the curvature of the product changes or when forming a single bent glass only in the direction perpendicular to the normal conveying direction, at least in the heating furnace. It was necessary not only to replace the bed from the bed near the end to the cooling bed, but also to arrange the bed horizontally, and in some cases this gas hearth furnace might not be able to handle it.

For the purpose of eliminating such drawbacks, Japanese Patent Laid-Open Nos. 5-9037 and 6-191867 have been proposed. However, in all cases, the bending in the conveying direction is basically performed by the same method as Japanese Patent Publication No. 49-10331, and the shape depending on the product from the final gas hearth bed or the bed close to the final bed to the final bed. The bed is also bent in the transport direction, and it is necessary to prepare a large number of beds of different sizes, not to mention the shape that is bent only in the direction perpendicular to the transport direction, depending on the product type. It was inevitable that adjustment and other work were done.

The present invention has been made in view of the above points, and it is not necessary to prepare a special final gas hearth bed according to the type of product, and the adjustment is easy at the time of switching. An object is to provide an apparatus capable of forming bent glass.

[0007]

DISCLOSURE OF THE INVENTION The present invention provides a shape in which a glass sheet is floated and transferred on a hearth bed having a shape bent in a direction perpendicular to a conveying direction in a gas furnace, and the glass plate is shaped like the hearth bed while being transported. In the apparatus for bending and shaping, the final bed is characterized in that the hearth bed bent in the direction perpendicular to the sheet glass conveying direction is slightly shaken horizontally from the sheet glass conveying direction. The swing angle is preferably 0.1 ° to 0.5 °, and when the radius of curvature in the transport direction is tens of thousands of mm or less, the final gas hearth bed needs to be arranged in the front downward direction, and its inclination. The angle is preferably 0.3 ° or less, and the cooling bed in the next cooling step is also arranged in the front-down direction, and the inclination angle of the front-down direction is made substantially equal to the inclination angle of the final bed. When the preferred.

[0008]

Operation: Window glass for automobile, for example, door window,
Curved glass such as side glass is required not only to bend in the vertical direction but also to bend in the horizontal direction. The radius of curvature is about 1500 mm in the vertical direction, but 10000 mm to 50000 m in the horizontal direction.
The present inventors made the present invention paying attention to the fact that m is large.

In the gas hearth bending, in the case of a single bending in which the bending is carried out only in the direction perpendicular to the conveying direction, a plurality of gas hearth beds are arranged and the shape is gradually inclined from a bed having a flat shape to a final shape. The plurality of beds immediately before the final bed including the final bed are arranged so as to have a desired curvature, and at least a bed having the same curvature as the final bed is arranged. Only by shaking, the bending in the direction perpendicular to the carrying direction is used for bending in the carrying direction to perform bending. In this case, the generally required radius of curvature is 15 in the direction perpendicular to the transport direction.
When the swing angle θ with respect to the conveying direction in the horizontal direction is smaller than 0.1 ° in the case of about 00 mm, it is difficult to form a bent glass having a desired radius of curvature in the conveying direction, for example, tens of thousands of mm or less. If it exceeds 0.5 °, the gap between the last bed and the immediately preceding bed becomes large, and the plate glass during transportation may come into contact with the bed, which may adversely affect the bending quality. It is better to set it in the range of ° to 0.5 °.

When the radius of curvature in the conveying direction is relatively large, it is not necessary to arrange the final bed in the front-down direction, but when it is tens of thousands of mm or less, the final gas hearth bed is installed in the front-down direction. Then, the lowering of the final bed contributes to the further reduction of the radius of curvature, and in the case of individual pieces, it is more preferable to lower the cooling bed in the next cooling step as well.

At that time, the inclination angle of the front downward is 0.3 °.
If it is up to this point, the flow of each bed will be smooth, but if it exceeds this range, the adjacent portions of each bed will be at a steep angle and there is a risk that the flat glass will be damaged.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. FIG. 1 is a longitudinal sectional view of an essential part showing a bending apparatus of the present invention in an embodiment, and FIG. 2 is a plan view of an essential 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 a direction perpendicular to the transport direction to gradually decrease the curvature, and several beds including the final bed 2 _n on the downstream side are to be molded. Is bent to a curvature of. Further, a large number of holes are bored on the upper surface so that a high temperature gas is ejected.

In the present invention, all the beds are driven by 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 disposed in parallel with) and, swinging the final bed 2 _n in the horizontal direction as shown in FIG. 2 the angle θ by (an angle with respect to the horizontal line H), and further disposed forwardly downwardly downstream by the inclination angle phi ₁ The cooling bed 4 ₁ in the next cooling device 4 is also arranged such that the downstream side is inclined forward by the inclination angle φ ₂ .

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

The glass thus obtained has a radius of curvature of 1244 mm in a direction perpendicular to the carrying direction, a radius of curvature of 38406 mm in the carrying direction, and a drop amount of 1.0 m.
m and glass suitable for automobiles, 1250
From the upstream side of a single-bending gas hearth bed that can be bent to a radius of curvature of mm to the gas hearth bed before the last, it can be used as it is without adjusting, and the final gas hearth bed does not need to be replaced and the position can be adjusted. Is adjusted by adjusting a supporting tool (not shown), and the cooling bed can be adjusted only by adjusting the height of its support.

The preferred embodiments have been described above, but the present invention is not limited to these, and various applications are possible. The swing angle of the final gas hearth bed is set so that the gap between the final bed and the bed before the final bed changes depending on the size of the bed so that the gap does not exceed 5 mm, and the radius of curvature in the transport direction is 0.1 ° to 0. It may be appropriately selected within the range of 5 °.

In the embodiment, both the final gas hearth bed and the cooling bed are arranged at the same inclination angle on the downstream side in the front downward direction, but the bending in the conveying direction is large and the radius of curvature is 100,000.
If the radius of curvature is less than 100,000 mm and the final gas hearth bed has a relatively small inclination angle, the cooling bed may not necessarily be inclined.

[0019]

EFFECTS OF THE INVENTION According to the present invention, a single bending gas hearth bed can be used for complex bending, and it is necessary to prepare a special bed as the final gas hearth bed according to the type. Alternatively, even when switching, if the bending curvatures in the direction perpendicular to the transport direction before and after switching are the same, it is possible to deal with it only by adjusting the position of only the final bed or only the final bed and the cooling bed.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential 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]

1 gas hearth furnace 2 _n-1 , 2 _n gas hearth bed 3 chain 4 cooling device 4 ₁ cooling bed 5 plate glass

Claims (6)

[Claims] 1. An apparatus for bending a sheet glass into a shape conforming to the hearth bed while levitating and transferring the sheet glass on a hearth bed having a shape bent in a direction perpendicular to a conveying direction in a gas furnace. The bed is a glass sheet bending apparatus, characterized in that a hearth bed bent in a direction perpendicular to the sheet glass conveying direction is slightly shaken in the horizontal direction from the sheet glass conveying direction. 2. The apparatus for bending a glass sheet according to claim 1, wherein the swinging angle of the final bed from the conveying direction to the horizontal direction 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 arranged such that the downstream side is arranged in the front downward direction. 4. The apparatus for bending a glass sheet according to claim 3, wherein the final gas hearth bed has a front-down inclination angle of 0.3 ° or less. 5. The apparatus for bending a glass sheet according to claim 3, wherein the cooling bed for the next step is arranged from the final gas hearth bed to the front downward direction. 6. The apparatus for bending a glass sheet according to claim 5, wherein the inclination angle of the cooling bed toward the front is substantially equal to the inclination angle of the final bed.