JP2007230864A - Device for forming composite bending of glass plate and final hearth bed for the device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding device for composite bending of a glass plate, which is easy to be operated for switching over the product kind and easy to be adjusted for the operation in the production of a compositely bent glass plate using a gas hearth furnace. <P>SOLUTION: The final hearth bed is mounted on a bed supporter at a distal end of the exit side of a device for forming a window glass with a compositely bent surface for automobiles. The compositely curved surface is prepared by: floating a glass plate upon hearth heads arranged in a sequence inside a heating furnace by jetting a high temperature gas from a jetting nozzle perforated on the surface of the hearth head; and bending the glass plate along the shape of the surface of the hearth head by its own weight while heating and conveying from the entrance side of a heating furnace to the exit surface. The distal side surface of the final hearth head at the upper stream side has a cut off surface cut with the slope at an angle θ in the range of 1.0°-2.0° against the above distal side surface in the position from the axis of conveying direction of the glass plate to one side of the corner of the final hearth head. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a gas hearth bending apparatus for forming a glass plate having a composite curved surface like a window glass for an automobile. The glass plate having a compound curved surface in this specification is a three-dimensional plate glass having a curved surface around an orthogonal XY axis, and in particular, curved in a convex shape only on one of the positive and negative of the Z axis. A glass plate having a desired curvature.

The curved glass plate used for window glass for automobiles is a gravity bending method in which the plate glass placed on the mold is heated and softened and suspended by gravity to bend, and the plate glass heated using the die is press-bended. It is bent by the press bending method, the gas hearth bending method in which the plate glass is floated and moved by the high-temperature gas ejected from the hearth bed, the roller hearth bending method in which the plate glass is bent in accordance with the shape of the transport roll while being rolled. Depending on the size and shape of the curved glass plate, they are properly used.

The method of bending with a gas hearth furnace is highly productive and has the advantage that it can be produced at low cost, but it produces a single bent glass plate that has a curvature with respect to the direction perpendicular to the conveying direction of the glass plate. However, it is not easy to manufacture a composite bent glass plate bent in the conveying direction.

In the gas hearth bending method, each hearth bed continuously arranged in the heating furnace has an upstream end face and a downstream end face perpendicular to the axis of the sheet glass conveyance direction, and on the hearth bed, The plate glass is floated by jetting high temperature gas through a gas jet port penetrating from the back surface of the bed substantially perpendicularly to the surface of the hearth bed, and the plate glass is conveyed from the inlet side to the outlet side of the heating furnace. During heating, the glass plate is gradually bent into a shape that follows the hearth bed by its own weight.

In order to continuously form a composite bent glass plate having a radius of curvature of several tens of thousands mm in the conveying direction, by cooling the glass plate in a high-temperature softened state while conveying the plate glass in a curved direction, for example, downward. It is necessary to solidify into a desired curved shape.

Japanese Patent Publication No. 49-10331 (USP3) is an apparatus for compoundly bending plate glass in the conveying direction.
409422) is well known. This device is a composite in which the transport surface of a plurality of hearth beds after the bed close to the end of the gas hearth furnace and the transport surface of the cooling device connected to the final bed at the gas hearth outlet are also curved in the transport direction of the plate glass. It is a curved surface.

The composite curved surface bed and the cooling device are devices that bend the plate glass into a composite curved surface by being disposed so as to be gradually inclined downward in the conveying direction. In this apparatus, since the bed and the cooling apparatus are sequentially connected downward, there has been a problem that the height position to be taken out as the final product becomes too low.

In addition, when switching between the production of a single bent glass plate and a composite bent glass plate, it is necessary to replace a plurality of beds close to the end in the heating furnace and a cooling device connected to the beds, In addition, it is necessary to adjust the inclination angle and connection between the plurality of beds, and to connect the final bed and the cooling device and to adjust the inclination angle.

As an apparatus for forming a composite bent glass plate other than the above, JP-A-5-9037 (USP 6014).
873), JP-A-6-191867 (USP 5522912), JP-A-8-15122.
No. 1 has been proposed. In Japanese Patent Laid-Open No. 5-9037, a glass plate is moved along a conveying surface having a double curved surface shape having a predetermined curvature and an upward convexity in the vicinity of the exit of the glass forming furnace. It is characterized by compound bending.
However, when the product type is switched from the production of a single bent glass plate to the production of a composite bent glass plate, it is necessary to precisely adjust not only the bed exchange but also the bed inclination angle.

In JP-A-6-191867, the final bed close to the outlet of the heating furnace has a top surface that is raised upward toward the outlet of the heating furnace, and at least a portion of the upper surface of the final bed close to the outlet of the heating furnace is flat glass. It is characterized by being curved along the conveying direction. However, in the same way as the technique disclosed in Japanese Patent Laid-Open No. 5-9037, when the product is switched from the single bent glass plate to the production of the composite bent glass plate, not only the bed change but also the bed inclination angle. Need to be finely adjusted.

When using the apparatus described in Japanese Patent Application Laid-Open No. 8-151221 (Patent No. 2809596) related to the applicant's application, the final bed is placed on the bed support from the axis of the sheet glass in the transport direction. Since it is possible to switch to the process of manufacturing a composite bent glass plate by swinging a slight angle, it is not necessary to prepare a special final bed according to the type, and it is easy to adjust when switching the type. . However, if an attempt is made to produce a glass plate having a small radius of curvature, the swing angle of the final bed will increase, and the gap between the final bed and the previous bed will widen, resulting in a reduction in the jet air pressure. The buoyancy that causes the glass sheet to float is reduced due to a decrease in the blown air pressure, and the conveyed glass sheet is rubbed with the bed, so that scratches and cracks are likely to occur.

Japanese Patent Publication No.49-10331 (USP 3409422) Japanese Patent Laid-Open No. 5-9037 (USP 6014873) Japanese Patent Laid-Open No. 6-191867 (USP 5522912) JP-A-8-151221 JP-A-8-151221 (Patent No. 2809596)

In order to efficiently produce composite bent glass plates using the gas hearth bend forming device constructed to produce single bent glass used for automotive window glass, it is easy to replace the bed and cooling device. It is important to be able to replace the final bed easily, especially
It is important that it can be installed and adjusted easily.
In the prior art, since the final bed is inclined, it is necessary to precisely adjust not only the bed exchange but also the bed inclination angle.

In view of the above, the present invention provides a single bent glass plate and a composite bent glass plate that are used in an automotive window glass without losing the inherent advantage that the gas hearth furnace has high productivity. An object of the present invention is to provide an apparatus for producing with high productivity using a gas hearth furnace.

The present invention cuts one corner portion of the final bed in the gas hearth furnace obliquely, and abuts the notched portion with the end surface of the bed on the near side adjacent to the final bed, so It is the last bed used for the composite bending apparatus of the plate glass used for the window glass for motor vehicles which enabled the clearance gap with the side bed to be made small. That is, this final bed is a composite bend using the bed for producing a single bent glass plate as it is by simply swinging the final bed on the bed support by the θ angle from the axis of the plate glass conveyance direction. A glass plate can be manufactured.

When replacing a cooling device inclined in a downward slope related to the technique disclosed in Japanese Patent Application Laid-Open No. 8-151221 relating to the application of the present applicant, the angle adjustment of the cooling device and the level adjustment work of the final bed are quite skilled. Need working hours. If the tilt angle of both the tilted bed and the tilted cooling device is adjusted and the level between them is adjusted, more skill and work time will be required for replacement work. Become.

In the apparatus according to the present invention, the final bed is merely placed on the bed support while being brought into contact with the end surface of the adjacent bed on the near side. ,
The labor required for adjusting the rising angle of the bed, which is required in the prior art disclosed in Japanese Patent Application Laid-Open No. 6-191867, is reduced, and even a worker who is not limited to a skilled worker can perform the bed replacement work.

That is, the present invention (1) floats a plate glass on a hearth bed continuously arranged in a heating furnace by jetting high temperature gas from a gas jet port drilled in the surface of the hearth bed. While heating from the entrance side to the exit side of the heating furnace, the window glass for an automobile having a composite curved surface is formed by bending the shape of the plate glass by the weight of the plate glass to the shape of the hearth bed surface. A final hearth bed placed on the bed support at the outlet end of the apparatus, wherein the upstream end surface of the final hearth bed extends from the plate glass conveyance direction axis of the hearth bed to a corner portion on one side. Notch angle θ in the range of 1.0 ° to 2.0 ° with respect to the end face
A final hearth bed for a composite bending apparatus for flat glass, characterized in that it has a cut-out surface cut obliquely.

In the present invention, (2) each of the hearth beds arranged continuously has an upstream end surface and a downstream end surface orthogonal to the axis of the plate glass conveyance direction, and the upper surface of each hearth bed The side hearth bed is flat, but gradually bent in the direction perpendicular to the conveying direction toward the downstream side hearth bed and gradually becomes a curved surface with a small radius of curvature, and multiple beds including the final hearth bed on the downstream side are formed. The final hearth bed for a composite bending apparatus for sheet glass according to claim 1, wherein the hearth bed is a single bending hearth bed that is bent to the curvature of the product to be manufactured.

Further, according to the present invention, (3) the final hearth bed according to (1) or (2) described above is brought into contact with the downstream end surface of the upstream upstream bed adjacent to the final hearth bed. Of the plate glass used for the window glass for automobiles, characterized in that the final hearth bed is installed on the bed support by the angle θ from the conveyance axis of the plate glass. It is a compound bending apparatus.

Further, in the present invention, (4) the cooling device in the next step is connected to the end of the final hearth bed at the outlet side end so as to incline in a front-down state. It is a bending apparatus.

When the final bed for the gas hearth bending apparatus according to the present invention is produced using the same gas hearth furnace, the single bent glass plate and the composite bent glass plate used for the window glass for automobiles are used.
The manufacturing process is easily changed, and the curvature value of the composite bent glass sheet can be easily changed and adjusted.
In the composite bending apparatus of the present invention, the change of the manufacturing process associated with the change of product type is that the final bed for composite bending is not tilted in the conveying direction of the plate glass, and the bed support table at the end of the gas hearth bed at the outlet side is used. The change work related to the gas hearth bed can be completed only by placing the work on the top. That is, a single bent glass plate and a composite bent glass plate can be manufactured with high productivity using the same gas hearth furnace without impairing the inherent characteristic of high productivity of the gas hearth furnace.

In the production of bent glass sheets by the gas hearth bending method, a single bent glass sheet bent only in the direction perpendicular to the conveying direction and a composite bent glass sheet having a curvature also in the conveying direction are produced in the same gas forming furnace. Will do. In order to maintain the high production efficiency that is a characteristic of the gas hearth bending method, it is desirable that the manufacturing process be capable of promptly performing a change operation of the manufacturing process in accordance with the product change.

From this point of view, the present applicant only needs to slightly shake the final bed on the bed support, and uses the bending in the direction orthogonal to the conveying direction to form the composite bent glass plate. The invention of the device having the gist of the invention has been filed and is registered as Japanese Patent No. 2809596.

If the apparatus of the invention is used, the hearth bed type switching operation can be completed simply by shifting the position of the final bed on the bed support at the outlet end of the gas hearth furnace without changing the shape of the final bed. It is extremely simple and has good workability.
However, if an attempt is made to produce a composite curved glass with a larger swing angle and a smaller radius of curvature in the transport direction, the gap between the last bed and the bed immediately before the last bed becomes larger. The force to float the plate glass is reduced, and the plate glass rubs against the bed, so that scratches are easily generated.

In the present invention, even if the final bed is somewhat processed and molded, the simplicity of the adjustment operation of the final bed position at the time of product change, which was the main purpose of the device of the applicant's invention, is lost. A composite bent glass sheet forming apparatus and a final bed for use in the apparatus are provided.

In the final bed of the present invention, the portion where the corner portion of the upstream end surface of the final bed is cut out is cut from the midpoint where the axis that is the center line of the bed glass conveyance direction and the end surface of the bed intersects to the corner portion on one side. The notch and notch angle θ ranges from 1.0 ° to 1.2.
A range of 0 ° is preferable.

When installing the final bed of the present invention, the notch surface of the final bed is on the front side, i.e., the surface is connected to the downstream end surface of the upstream hearth bed, including the setting of the swing angle. You can finish the work. Further, the cooling device for the next step connected to the final hearth bed is disposed at a front downward slope at a forward downward inclination angle φ (see FIG. 1) at the outlet side end of the final bed. This cooling device may have a compound bending shape curved in the conveying direction of the plate glass.

When switching from single bent glass plate to composite bent glass plate production, the gas hearth bed from the upstream side to the last minute is used without adjusting the hearth bed for single bending as it is,
Only the final bed may be replaced with a bed having a corner portion cut out, and the angle may be adjusted with respect to the axis of the plate glass conveyance direction of the bed while being placed on the bed support. Angle adjustment can be performed easily and with good reproducibility simply by bringing the notched surface of the final bed into contact with the end surface of the hearth bed immediately before the final bed. When a single bending cooling device is used as the cooling device for the next process, the switching operation can be completed only by adjusting the height of the supporting column without replacing the cooling device.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment of a sheet glass composite bending apparatus according to the gas hearth method of the present invention, and FIG. FIGS. 3A and 3B show the final hearth bed in which one corner is cut obliquely.

As shown in FIG. 1, the gas hearth furnace 1 is a tunnel-type heating furnace, in which a plurality of gas hearth beds 2 are linearly disposed, and an air duct pipe 21 for a cooling device is provided at the outlet of the furnace 1. A cooling device 20 having an upper air blow quenching device 22 and a lower air blow quenching device 23 is connected.

Each gas hearth bed 2 has an upstream end surface and a downstream end surface orthogonal to the axis of the plate glass conveyance direction, and the upper surface of each hearth bed is a flat surface in the upstream side, that is, the inlet side hearth bed. As it moves toward the side hearth bed, it is gradually bent in the direction perpendicular to the conveying direction to gradually become a curved surface with a small radius of curvature, and the plurality of beds 2 including the final bed 5 on the downstream side are bent to the curvature of the product to be molded. Has been.

In addition, a large number of holes (not shown) are formed on the upper surfaces of all the beds, and the plate glass 10 is floated on the bed 2 by the high-temperature gas ejected from the holes, and the floated plate glass 10 is exited from the entrance side by a driving device. Transport to the side. In the final bed 5 shown in the perspective view of FIG. 3, a part of hot gas ejection holes 11 drilled in the upper surface of the bed is shown.

As shown in FIG. 3, the upstream end surface of the final bed 5 is cut out at an angle θ from the midpoint where the axis that is the center line in the sheet glass conveyance direction of the bed and the end surface of the final bed 5 intersects to one corner. A cut-out surface 6 is formed. As shown in FIG. 2, the notch surface 6 is brought into contact with the end surface of the hearth bed 2 immediately before the final bed 5 and placed on the bed support 4 so that the final bed 5 can be moved in the direction of the sheet glass conveyance direction. It is installed so as to swing on the bed support base by an angle θ from the center C. A gap with an angle θ is formed from the midpoint to the other corner only between the upstream end face other than the notch face 6 of the final bed 5 and the end face of the hearth bed 2 immediately before it.

All the beds of the gas hearth furnace, that is, the gas hearth bed 2 and the final bed 5 are tilted by several degrees with respect to the horizontal plane on the drive chain 3 side (lower side in FIG. 2) shown in FIG. It is arranged so that it can be easily locked to a non-conveying jig. That is,
The bed support 4 for supporting all the beds is installed inclined at the same angle of several degrees with respect to the horizontal plane from the upstream side to the downstream side. Simply placing the final bed 5 on the bed support 4 means that the bed is placed on the bed support 4 tilted several degrees with respect to the horizontal plane without being tilted in the sheet glass conveyance direction. Yes.

The longitudinal cross-sectional view of the gas hearth furnace which shows one form of the apparatus of this invention. The partial top view of FIG. The perspective view of the last bed which notched the corner part in the apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas hearth furnace 2 Gas hearth bed 3 Drive chain 4 Bed support stand 5 Final bed 6 Notch surface 10 of the final bed which notched the corner part Plate glass 11 High temperature gas ejection hole 20 Cooling device 21 Air duct pipe 22 for cooling device Upper part Air blow quencher 23 Lower air blow quencher

Claims (4)

On the hearth bed continuously arranged in the heating furnace, the plate glass is levitated by ejecting high-temperature gas from a gas jetting hole drilled in the surface of the hearth bed, and from the inlet side to the outlet side of the heating furnace Bed support at the end of the outlet side of an apparatus for forming a window glass for an automobile having a composite curved surface by bending it into a shape following the shape of the hearth bed surface by its own weight while being heated while being conveyed to A final hearth bed placed on a table,
The upstream end face of the final hearth bed is inclined at a notch angle θ in the range of 1.0 ° to 2.0 ° with respect to the end face from the central axis of the plate glass conveying direction of the final hearth bed to one corner. A final hearth bed for a composite bend forming apparatus for flat glass, characterized by having a notched surface. Each of the hearth beds arranged continuously has an upstream end surface and a downstream end surface orthogonal to the plate glass conveyance direction axis, and the upper surface of each hearth bed is a flat surface at the inlet side hearth bed, As it goes to the downstream hearth bed, it is gradually bent in the direction perpendicular to the conveying direction and gradually becomes a curved surface with a small radius of curvature, and the plurality of beds including the downstream final hearth bed are bent to the curvature of the product to be molded. The final hearth bed for a compound glass bending apparatus according to claim 1, wherein the hearth bed is a single bending hearth bed. The final hearth bed according to claim 1 or 2, wherein the final hearth bed is surface-connected by bringing the notch surface into contact with the downstream end surface of the upstream bed adjacent to the final hearth bed. A plate glass composite bending apparatus used for window glass for automobiles, characterized in that the glass plate is placed on the bed support by the angle θ from the axis of the sheet glass conveyance direction. 4. The apparatus for bending and bending a glass sheet according to claim 3, wherein the cooling device in the next step is connected to the end portion on the outlet side of the final hearth bed so as to be inclined downward.

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