JPH06191867A - Apparatus for production of bent sheet glass - Google Patents

Abstract

PURPOSE:To efficiently bend sheet glass in both of a longitudinal direction and a transverse direction by means of transporting beds which eject hot air in a heating furnace. CONSTITUTION:The plural beds 2... bored with many hot air ejection holes atop these beds are arranged in the heating furnace 1 of a tunnel type from the upstream side toward the downstream side. The final bed 2a near the outlet 1a of the heating furnace 1 among these plural beds 2 is arranged to incline, by which the front surface thereof is formed to the shape uphill toward the outlet 1a of the heating furnace 1. In addition, the front surface of the final bed is curved in both of the direction orthogonal with the transporting direction of the sheet glass G and the direction along the transporting direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing bent flat glass having a three-dimensional curved shape which is curved in both the vertical and horizontal directions, such as a windshield of an automobile.

[0002]

2. Description of the Related Art For producing a flat glass having a three-dimensional curved shape which is curved both vertically and horizontally, Japanese Patent Laid-Open No. 52-782 has been proposed.
Generally, press molding is performed between an upper mold and a lower mold (ring mold) as disclosed in Japanese Patent No. 26. However, the apparatus for press-forming between the upper and lower molds is complicated and costly.

Therefore, a manufacturing apparatus using a transfer bed as disclosed in the Glass Handbook (p491) is known as an apparatus having low cost and excellent continuous productivity.
In this manufacturing apparatus, a plurality of transfer beds having a large number of hot air ejection holes formed on the upper surface are horizontally and continuously arranged in the heating furnace, and plate glass is floated on the beds to transfer the inside of the heating furnace. During this period, the plate glass is heated so that the plate glass is bent and shaped in accordance with the shape of the upper surface of the transfer bed.

[0004]

In the above-described forming by the transfer bed, when the plate glass is bent in the direction orthogonal to the transfer direction, the bed shape may be high in the central portion and low in both sides. However, when it is used as an automobile windshield, it is necessary to bend it in the direction along the transport direction. However, if the upper surface of the bed is curved in the direction along the transport direction, a step is generated at the seam portion of the bed, and the glass sheet cannot be transported.

[0005]

In order to solve the above-mentioned problems, the first invention of the present application is such that, of the plurality of beds arranged in the heating furnace, the upper surface of the final bed close to the outlet of the heating furnace is the heating furnace. The upper end of the final bed was curved at least near the outlet of the heating furnace along the sheet conveying direction. In the second invention of the present application, the final bed is further divided into a plurality of small beds along the sheet glass conveying direction, and a curved surface along the sheet glass conveying direction is formed as a whole of these small beds.

[0006]

When the sheet glass is transported to the final bed in a state of floating on the bed in the heating furnace, the final bed is curved in the direction along the transport direction and the direction orthogonal to the transport direction. It is bent in either direction. Since the bed outside the heating furnace following the final bed is continuous with the final bed without a step, the bent glass sheet is smoothly carried out of the furnace without being caught.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a vertical cross-sectional view of a bent sheet glass manufacturing apparatus according to the present invention, FIG. 2 is a perspective view showing the arrangement of beds, and FIG. 3 is a final bed inside a heating furnace and a quenching bed outside the heating furnace. It is a figure which shows a dimension and a tilt angle.

The apparatus for producing bent sheet glass comprises a plurality of beds 2 in a tunnel-type heating furnace 1 from upstream to downstream.
... is placed. The beds 2 have a large number of hot air ejection holes 3 formed on the upper surface thereof.

Of the plurality of beds 2, the final bed 2a close to the outlet 1a of the heating furnace 1 is inclined so that its upper surface has a front rising shape toward the outlet of the heating furnace. The upper surface of is curved in both the direction orthogonal to the transport direction of the sheet glass G and the direction along the transport direction.

A quenching device 4 is arranged outside the heating furnace near the outlet 1a of the heating furnace. This quenching device 4
Is a quenching bed 5 which receives the plate glass G from the final bed 2a and has cooling air ejection holes formed in the upper surface thereof.
And a cooling box 6 provided above the rapid cooling bed and having cooling air ejection holes formed in the lower surface thereof.

Here, taking an example of the curvature of the upper surface of the final bed 2a, the radius of curvature (R1) in the direction orthogonal to the conveying direction of the plate glass G is 1,000 mm to 4,000 m.
m, and the radius of curvature (R2) along the transport direction is 1
It is set to 50,000 mm to 60,000 mm.

FIG. 3 shows specific values of the dimensions and inclination angles of the final bed 2a and the bed 5 following it when R2 = 30,000 mm. The size is 760 mm, the whole is tilted forward toward the exit 1a by 0.603 °, and 400 mm near the exit 1a on the upper surface of the final bed.
The part of is curved. The size of the bed 5 in the conveying direction of the glass sheet G is 1823 mm, and the entire bed is tilted downward from the exit 1a by 0.764 ° so that the final bed 2a and the bed 5 are smoothly continuous without a step. .

In the above, the sheet glass G carried into the heating furnace 1 is conveyed toward the outlet 1a of the heating furnace 1 while being floated from the upper surface of the bed 2 by the hot air jetted from the upper surface of the bed 2. The plate glass G is transported, for example, in the bed 2
This is done by arranging a chain along one side of the plate, contacting one side of the plate glass G with the chain, and running the chain.

In this way, when the sheet glass G reaches the final bed 2a while being conveyed to the bed 2 in a non-contact state, the final bed 2a is, as described above, a direction orthogonal to the sheet glass G conveying direction and a conveying direction. Since it is curved in both directions, the plate glass G is curved in both the vertical direction and the horizontal direction as shown in FIG.
Table 1 shows the radii of curvature (R2) along the transport direction of 10,000 mm, 30,000 mm and 60,000.
A double amount W in mm is shown.

[0015]

[Table 1]

5 and 6 are views showing another embodiment,
In the embodiment shown in FIG. 5, the upper surface of the quench bed 5 is also curved so that the connection with the final bed 2a can be performed more smoothly. Further, in the embodiment shown in FIG. 6, the final bed 2a is further divided into a plurality of small beds 21, 22, 23 along the sheet glass conveying direction, and the plurality of small beds 21, 22, 23 are tilted. By arranging as a whole, a curved surface is formed as a whole along the sheet glass conveyance direction. In addition, small bed 2
The upper surface of each small bed may be a curved surface without tilting 1, 22, 23.

In the examples, the plate glass after forming was quenched and strengthened, but the bed outside the heating furnace following the final bed was not used for quenching, but was merely for transportation.
A box for ejecting cooling air on the upper surface of the sheet glass after forming may be omitted.

FIG. 7 is a view similar to FIG. 1 showing another embodiment, in which the shape of the final bed 2a in the heating furnace 1 is such that the central portion of the upper surface bulges in the width direction orthogonal to the sheet glass conveying direction. It is curved and linear in the direction along which the sheet glass is conveyed. Further, in this embodiment, the final bed 2a is inclined forward and upward along the sheet glass conveying direction, the quenching bed 5 is horizontal, and the three-dimensional curved surface shape is used when transferring from the final bed 2a to the quenching bed 5. Is bent and formed. Although the quenching bed 5 is horizontal in the illustrated example, it may be inclined forward and downward. The point is that the final bed 2a may be inclined relatively upward with respect to the rapid cooling or transfer bed 5.

Since the final bed 2a shown in FIG. 7 is not curved along the sheet glass conveying direction, the sheet glass G
When passing over the final bed 2a, the lower surface of the glass sheet G may contact the upper edge portion of the downstream end of the final bed 2a.
Therefore, in this embodiment, the chamfered portion 24 is provided at the upper edge of the downstream end of the final bed 2a to avoid it.

[0020]

FIG. 10 (a) is a graph showing the amount of doubled flat glass (500 × 800 × 3.4) bent by the manufacturing apparatus of the present invention, and FIG. 10 (b) is a flat glass (500 bent by the conventional manufacturing apparatus. It is a graph which shows the amount of doubles of x800x3.4).
The measurement position of the amount of debris is shown in FIG. 7 (c). As apparent from these graphs, according to the present invention, the upper surface of the final bed in the heating furnace for ejecting hot air and transporting the sheet glass in a non-contact state has a forward rising shape toward the outlet of the heating furnace. Moreover, at least a portion of the upper surface near the outlet of the heating furnace is curved along the sheet glass conveying direction, or the final bed is further divided into a plurality of small beds along the sheet glass conveying direction, and the entire small bed is formed. As a curved surface is formed along the conveying direction of the sheet glass as a three-dimensional curved sheet glass in both the vertical direction and the horizontal direction in a continuous running state without stopping the conveying without using a mold. It can be formed into a curved shape. In particular, the apparatus according to the present invention can perform heating and molding at the same time, and can further rapidly quench and strengthen after molding, so that the productivity is greatly improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an apparatus for manufacturing a bent sheet glass according to the present invention.

FIG. 2 is a perspective view showing an arrangement state of beds.

FIG. 3 is a diagram showing dimensions and inclination angles of a final bed inside the heating furnace and a quenching bed outside the heating furnace.

FIG. 4 is a perspective view of the sheet glass after forming.

FIG. 5 is a diagram showing another embodiment.

FIG. 6 is a diagram showing another embodiment.

FIG. 7 is a view similar to FIG. 1 showing another embodiment.

FIG. 8 is a side view of the final bed of another embodiment shown in FIG.

FIG. 9 is an end view of the final bed seen from the quencher side.

FIG. 10 (a) is a graph showing a double amount of a sheet glass bent and formed by a manufacturing apparatus of the present invention, and FIG. 10 (b) is a graph showing a double amount of a sheet glass bent and formed by a conventional manufacturing apparatus.
(C) is a perspective view of the plate glass showing the measurement position of the amount of debris

[Explanation of symbols]

1 ... Heating furnace, 2 ... Bed in heating furnace, 2a ... Final bed, 3 ... Hot air ejection hole, 4 ... Quenching device, 5 ... Quenching bed, 6 ... Quenching box 21, 22, 2
3 ... Small bed, 24 ... Chamfer, G ... Sheet glass.

Claims (5)

[Claims] 1. A plurality of beds each having a large number of hot air ejection holes formed on the upper surface thereof are arranged continuously from the inlet to the outlet of the heating furnace, and the plate glass is in contact with the bed from the inlet to the outlet of the heating furnace. In the manufacturing apparatus of the bent plate glass, which is formed by heating the plate glass during transportation to form it according to the shape of the upper surface of the bed, the upper surface of the final bed of the plurality of beds close to the outlet of the heating furnace is the outlet of the heating furnace. An apparatus for manufacturing a bent sheet glass, which has a frontwardly rising shape, and at least a portion of the upper surface of the final bed near the outlet of the heating furnace is curved along the sheet glass conveying direction. 2. A plurality of beds having a large number of hot air ejection holes formed on the upper surface thereof are arranged continuously from the inlet to the outlet of the heating furnace, and the plate glass is in contact with the bed from the inlet to the outlet of the heating furnace. In the apparatus for manufacturing a bent sheet glass which is configured to be heated to form a sheet glass while being conveyed to be shaped according to the shape of the upper surface of the bed, the final bed among the plurality of beds near the outlet of the heating furnace is a plurality along the sheet glass conveyance direction. 2. A bent plate glass manufacturing apparatus, characterized in that the bent plate glass is divided into a plurality of small beds, and a curved surface is formed as a whole of the plurality of small beds along the conveying direction of the plate glass. 3. A quenching bed, which is continuous with the last bed in the heating furnace, is arranged outside the exit of the heating furnace, and the quenching bed is inclined or the upper surface is curved along the sheet glass conveying direction. The bent plate glass manufacturing apparatus according to claim 1 or 2, which is continuous with the upper surface of the final bed without any step. 4. A plurality of beds having a large number of hot air ejection holes formed on the upper surface thereof are continuously arranged from the inlet to the outlet of the heating furnace, and the outside of the outlet of the heating furnace is rapidly cooled to the final bed in the heating furnace. Bending flat glass that has a heating or transporting bed and heats the flat glass while the flat glass is being transported from the inlet to the exit of the heating furnace in a non-contact state with the bed to be shaped according to the shape of the upper surface of the bed. In the apparatus, the final bed in the heating furnace is curved so that the central portion of the upper surface bulges in the width direction orthogonal to the transport direction of the sheet glass, and the final bed is relative to the quenching or transport bed. An apparatus for manufacturing a bent sheet glass, which is characterized by an upward inclination. 5. The chamfered portion for avoiding contact with the lower surface of the glass sheet is provided at the upper edge portion of the downstream end of the final bed in the heating furnace, as claimed in any one of claims 1 to 4. An apparatus for manufacturing a bent sheet glass according to claim 1.