JPS6060934A - Temper- or half-temper-bent glass and its production - Google Patents

Abstract

PURPOSE:To produce temper- or half-temper-bent glass having excellent dimensional accuracy with high productivity by placing green flat glas on a metallic mold, heating the glass and deforming the green flat glass along the curved surface shape of the mold by the own weight then cooling quickly the glass. CONSTITUTION:A metallic mold 1 consists of an outside frame 2 and rails 3 provided like fencing on the inside of the frame 2. The frame 2 and the rails 3 form one curved surface when the top edges thereof are connected. Flat-plate-shaped green glass 4 placed on the mold 1 is heated together with the mold in a furnace. The glass 4 subjected to such heating treatment deflects to the curved surface shape formed by the rails 3 until the glass is supported by the top edges of the rails 3 by the own weight. Where the glass 4 bends along the curved surface shape formed by the frame 2 and the rails 3, the bent glass 4' is quickly cooled by the refrigerant, for example, air 7, ejected from nozzles 6 provided above and below the glass 4' while said glass is kept placed on the mold 1. The temper- or half-temper-bent glass is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a reinforced or semi-strengthened bent glass and a method for manufacturing the same, and more particularly to a method of manufacturing the same with excellent dimensional accuracy and a desired curved shape, which is useful for vehicle glass and the like. The present invention relates to a tempered or semi-strengthened bent glass and a manufacturing method thereof.

Prior art tempered or semi-strengthened glass has 3 to 4 times the bending strength and 3 to 5 times the impact strength of raw glass.

Therefore, tempered or semi-strengthened glass is often used as flat glass in fields that require high strength and impact resistance. Further, tempered or semi-strengthened glass has a curved shape, and is used in the field of manufacturing as so-called bent glass. For example, it is used as window glass for fruits.

However, conventional tempered or semi-strengthened bent glass is limited in shape due to manufacturing problems described below, and has low curved surface precision.However, if surface precision is required, productivity is low, and it is not sufficient to meet market needs. It is difficult to say that it is something that can be dealt with. Therefore, this improvement is desired.

The manufacture of tempered or semi-strengthened bent glass is generally carried out using a gravity method. This manufacturing method uses a mold with only an outer frame, and the curved surface is formed by deforming the heated raw glass sheet under its own weight. For this reason, the curved surfaces formed are limited to suspended surfaces, and it is almost impossible to create other curved shapes.Furthermore, since curved surfaces are formed only by deformation under their own weight, dimensional accuracy is poor and shape reproducibility is low. . However, for example, when laminated glass is made by laminating two sheets of conventional tempered or semi-strengthened bent glass, bubbles often occur on the mating surfaces because the curved surfaces are different, and this is a JIS test item. It is almost impossible to pass the perspective distortion, double image test.

The present inventor has arrived at the present invention as a result of intensive research aimed at solving such problems.

OBJECTS OF THE INVENTION The first object of the present invention is to provide a method for manufacturing reinforced or semi-strengthened bent glass with excellent dimensional accuracy with high productivity. A second object of the present invention is to provide a method for manufacturing tempered or semi-strengthened bent glass having various curved shapes with excellent dimensional accuracy and high productivity. A third object of the present invention is to provide a tempered or semi-strengthened bent glass with excellent dimensional accuracy. A fourth object of the present invention is to provide a tempered or semi-strengthened bent glass useful as a raw material for laminated glass. Yet another object of the present invention is to provide a tempered or semi-strengthened bent glass useful as vehicle glass.

Configuration of the Invention The object of the present invention can be achieved by adopting configuration 1.2 below.

1) A method for producing reinforced or semi-strengthened bent glass using a self-weight method, which includes an outer frame that defines the outer shape of the bent glass and a crosspiece that forms a predetermined curved shape inside the outer frame. Using a mold, a raw glass plate is placed on the mold and heated, the raw glass is deformed along the curved shape by its own weight, and then the glass is rapidly cooled with a refrigerant to be strengthened or semi-arcized. A method for manufacturing characterized tempered or semi-strengthened bent glass.

2) Forming an outer frame that forms the outer shape of the bent glass and a predetermined curved shape on the inside of the outer frame using the self-weight method on the raw glass.
A tempered or semi-strengthened bent glass with excellent dimensional accuracy manufactured by performing reinforced or semi-strengthened bending using a mold with a crosspiece.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a schematic external view of one mold 1 that can be used in the present invention. This mold 1 consists of an outer frame 2 and a rail 3 provided inside the outer frame in the form of a fence, and when the upper edges of the outer frame 2 and the rail 3 are connected,
It forms two curved surfaces.

In Figure 2, a mold 1 (shown as A-Aili surface) is placed on a trolley 5, and a flat raw glass 4 is placed on top of the mold 1 (shown as A-Aili surface).
It is a figure showing the state where it did. As can be understood from these figures, the mold used in the present invention has a crosspiece for forming a desired curved shape inside the outer frame. The shape of this crosspiece may be, for example, a grid-like shape (Fig. 3a) or a diamond-like shape (Fig. 3A) shown in Fig. 3.
Figure b) may be used, or other shapes may be used. Such a crosspiece has the function of regulating the curved shape of the glass plate, but on the other hand, it has the function of not preventing a refrigerant, such as air, from uniformly quenching the glass when heat-bent glass is strengthened or semi-arcized. In other words, it is preferable to have a structure that minimizes portions that are not rapidly cooled, so-called shadows. For this purpose, it is preferable to reduce the contact area between the crosspiece and the glass, and furthermore, it is preferable not to impede the flow of the refrigerant, such as the air ejected from the nozzle. For example, a tooth-shaped crosspiece (Fig. 4a),
The part that touches the glass is waved to disturb the air flow jetted from the nozzles arranged at regular intervals (fourth crosspiece).
There are crosspieces with various side shapes and cross-sectional shapes, such as Fig. b) and a crosspiece that combines both effects (Fig. 4C). Even other shapes have the above-mentioned function (1 can be used. If the crosspiece blocks the airflow and creates a shadow, the glass in that area will not be cooled quickly, resulting in uneven cooling. There may be so-called poorly hardened areas, which may cause cracks during cold Nj or may not exhibit the required strength.

As shown in FIG. 2, the flat raw glass 4 placed on the mold 1 is heated together with the mold 1 in a furnace.

By this heating treatment, the raw glass 4 is bent into the curved shape formed by the crosspiece 3 until it is supported by the upper edge of the crosspiece 3 under its own weight. This heat treatment can be performed, for example, under conventional heating conditions. When the raw glass 4 is bent along the curved shape formed by the frames 2 and 3, the bent glass 4' is placed on the mold 1 (part of the crosspiece 3 is shown in FIG. 5) and bent. The glass is rapidly cooled by a refrigerant such as air 7 ejected from nozzles 6 installed above and below the glass, and becomes tempered glass.

It is preferable to install a large number of cold tofu nozzles 6 like Kenzan, and it is particularly preferable that the tips of the nozzles are arranged in accordance with the curved shape of the bent glass 4'. Further, the nozzle 6 can be moved back and forth, left and right, or in a circular trajectory in order to rapidly and uniformly cool the glass surface. It may be moved to draw other trajectories. The diameter of the nozzle 6 may be determined depending on the temperature, thickness, degree of reinforcement, etc. of the glass. For example, if the wind pressure is high and the glass is rapidly cooled, the nozzle diameter should be small, and if the wind pressure is low and the wind m is large, the nozzle diameter should be small. It is better to increase the nozzle diameter.

FIG. 6 is a diagram showing a reinforced or half-arc north facing glass 4' produced using the mold shown in FIG.
The shape of the periphery 8 of ' is formed into the shape of the outer frame 2, and the curved surface 9 shows the curved surface shape formed by the beam 3. If you take a top and bottom cross section of this bent glass 4', you will see that it is a curved surface that is straight at the center and becomes curved as it goes left and right. This curved surface is the same as that of the mold 1 shown in FIG.

FIG. 7 is an overview diagram schematically showing a conventional mold 1'.

The mold 1' is made up of only the outer frame 2', and there is no crosspiece as in the case of the present invention. For this reason, the curved surface of the bent glass 4'' manufactured is a curved surface close to a suspended surface, but it is almost impossible to obtain a curved surface shape with high precision.In other words, the bent glass 4 manufactured using the conventional mold 1' As shown in Fig. 8, the glass periphery 10 is formed into the shape of the outer frame 2', but since the curved surface 11 is formed only by its own weight, it is almost a combination of catenary lines in the shape of the outer frame. become. The vertical warpage δ shown in Figure 8 is generally referred to as "overlap" and is one of the representative characteristics, but it is almost impossible to control this overlap δ constant due to changes in the humidity distribution in the furnace, etc. Currently, each product has only δ.

For this reason, for example, a front window glass for an automobile is allowed to vary in δ (for example, from 0 to 20 mm). However, when making laminated glass using these, for example, by stacking two pieces of conventional tempered glass or half-arc north-facing glass, it is almost impossible to make laminated glass that passes the JIS perspective distortion and double image tests. .

In the present invention, early tempered or tempered glass is JISR320
6, R3211, and R3212.

When looking at the state of residual stress in the bent glass manufactured by the present invention in a photoelastic test, as shown in the photograph in Figure 9, the photoelastic strain mark 13 that appears on general tempered or early strengthened glass was found.
．． In addition to 13', there is a mark 1 of photoelastic distortion caused by the crosspiece.
It is characterized by the appearance of 4.14'. Furthermore, in the case of automobile windshields, the overlap δ is mostly distributed between 0 and 1 mm. Further, the dimensions and curvature of the curved surface can have an accuracy of ±0.5 tnm or less with respect to the target dimension and curvature.

Example The present invention will be further explained below with reference to Examples.

Example 1.2 A raw glass plate with a thickness of 3 mm, a height of about 700 mm, and a width of about 1400 mm was molded into a mold (position of crosspieces: fence-like, shape of crosspieces: 4th
The one in figure a, tooth pitch: 15#1111#+111X
5 joints, spacing between crosspieces: 100-200 #111) Place on top,
It was heated in a furnace and deformed by its own weight. Next, the glass plate bent along the curved shape of the mold was taken out from the furnace, and a nozzle (front, rear, left and right spacing of nozzles = 40 mm, % nozzle diameter: 2 sφ
, vertical interval of the nozzle: 180 s) to rapidly cool the sample. Obtained automobile front window glass overlap δ
was between 0 and 1 mm, and other characteristics were as shown in the table below. This table also includes the furnace temperature and air pressure.

(Margin below) *Satisfies JISR3206 standards.

(The following is a blank space) Effects of the Invention According to the present invention, it is possible to manufacture a reinforced or semi-strengthened bent glass having a desired angular curved surface with good dimensional accuracy.
For example, two sheets of this reinforced or semi-strengthened bent glass can be bonded together using an adhesive or a resin plate such as a polycarbonate resin plate. Furthermore, it becomes possible to bond a resin plate subjected to heat bending and a reinforced or semi-strengthened bent glass plate.

[Brief explanation of the drawing]

FIG. 1 is a schematic overview of one embodiment of the mold used in the present invention, and FIG. 2 is a schematic overview of one embodiment of the mold used in the present invention, and FIG.
Fig. 3 is an explanatory drawing showing the arrangement of the crosspieces, Fig. 4 is a side view and cross-sectional view of the crosspieces, and Fig. 5 is a cross-sectional view of the crosspieces taken out from the furnace. FIG. 6 is a diagram showing an example of the bent glass of the present invention, and FIG. 7 is a schematic vA view of a conventional mold. , FIG. 8 is a diagram showing an example of a conventional bent glass, and FIG. 9 is a photograph of a photoelastic element. 1.1': Mold, 2.2': Outer frame, 3: Crosspiece, 4: Flat raw glass, 4', 4'': Bent glass, 5: Dolly, 6: Air nozzle, 7: Air, 8 Surroundings of Nigarasu, 9 Curved surface of Nigarasu, 10 Surroundings of Nigarasu, 11 Curved surface of Nigarasu, 1
2: Tooth pattern, 13.13': Photoelastic particle mark, 14.1
4': Photoelastic particle mark caused by the crosspiece. Patent Applicant: Teijin Kasei Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 6 Figure 9 Permission Office @ Government Hall 1, Indication of the case, Patent Application No. 168272/1983, 2, Title of the invention: Reinforced or half-price north-facing glass and its manufacturing method, 3 Person making the amendment: Relationship with the outside of the vehicle, Patent applicant: Minato-ku, Tokyo Nishi-Shinbashi l-6-21 (Yamato Angyokutoramon Building) Naejin Kasei Co., Ltd. Representative Yoshiki Yamazaki 4th generation 11.・Person (IJtsu)t%) 2-1-1 Uchisaiwai-cho, Chiyoda-ku, Tokyo (I[f Building) 6 も; j Positive Target IILl Aya 1. ``Detailed Description of the Invention'', ``Brief Description of Drawings'' column and drawings. 7. @Correct content (1) Specified disease, page 5, line 17, ``(Figure 3 a) and diamond shape (Figure 3 b) J are replaced with [(Figure 3 (a)) and Diamond shape (Fig. 3(b)) Corrected as J. (2) Same, page 6, line 7, "(Fig. 4 a)" was replaced with "(Fig. 4-1)". Correct. (3) Same, page 6, line 1θ, it says "(Fig. 4 b), the crosspiece that combines both effects (Fig. 4 c)" [(Fig. 4-2), both effects. Corrected to ``combined crosspieces (Figure 4-3).'' (4) Same, page 9, lines 12 to 16, "The photograph in Figure 9... is characterized by its characteristics." In addition to the wire-mesh-like pattern 13 caused by the air flow of the nozzle that appears in general tempered or hand-strengthened glass, there is also a pattern 14 of original elastic strain caused by the square shape of the crosspiece. In addition, the pattern t:I of the actual photoelasticity photograph is not necessarily as orderly as the one shown in the picture, since the air flow is disturbed by the shape of the crosspiece, the relative position of the tooth shape of the crosspiece and the nozzle, etc. do not have. In addition, the difference between tempered glass and hand-tempered glass is reflected in the contrast between the shadows and bright areas of the pattern.
Tempered glass is sharper. ” he corrected. (5) The table on page 11 of the same is corrected as follows. *Based on the JISR3206 standard. (6) Same, page 12, lines 14-15, ``Figure 3 is a cross-sectional view of the crosspiece, and Figure 5'' shows Tororo, [Figure 3 (, > (b) is an explanatory diagram showing the arrangement of the crosspieces, Figures 4-1, 4-2, and 4-3 are partial views of different crosspieces, and each (-) figure is Side view, each (B) figure is a plan view, each (C) figure is x-x, y-y, respectively
, Z-Z cross-sectional view, Figure 5 1'' is corrected. (7) Same, page 12, line 20, [Figure 9 is a photograph of photoelastic strain. '' is corrected to ``Figure 9 is a basic schematic diagram of all photoelastic photographs.'' (8) Same, page 13, line 5, [t3, 1a'J tororu is corrected to "13". (9) Same, page 13, line tISs, “x4.t4'J
Correct the statement to "14". 01 "Figure 3" of the drawing is corrected as shown in the attached "Figure 3". (The rm41EJ in the drawing is attached or #1s-I
J + Figures 4-2 and 4-3 are corrected. 0 Correct the drawing "Figure 9" (copy Figure 3 Figure 4-1 Figure 4-2 Figure 4-3 Figure 4-+Z Figure 9

Claims (1)

[Claims] 1) A method for producing reinforced or semi-strengthened bent glass using a self-weight method, which includes an outer frame that forms the outer shape of the bent glass and a crosspiece that forms a predetermined curved shape inside the outer frame. When used as a mold, a raw glass plate is placed on the mold and heated, the raw glass is deformed along the curved shape by its own weight, and then the glass is rapidly cooled with a refrigerant to be strengthened or semi-strengthened. A method for manufacturing tempered or semi-strengthened bent glass. 2) An outer frame that forms the outer shape of the bent glass under its own weight, and a crosspiece that forms a predetermined curved shape on the inside of the outer frame (strengthened or semi-strengthened bending is performed using a buta mold) Tempered or semi-strengthened bent glass with excellent dimensional accuracy.