JPS6137211B2 - - Google Patents

Description

Detailed Description of the Invention The present invention is a device for manufacturing curved tempered glass such as the windshield or rear glass of an automobile, and particularly relates to a press-forming method in which plate glass is placed vertically between molds using a hanger. The present invention relates to an apparatus for manufacturing reinforced bent glass.

In general, equipment for manufacturing curved tempered glass such as automobile windshields is one in which a glass plate is placed horizontally between molds, and another in which a glass plate is hung vertically and faces between molds. There is. Among these, the apparatus for press-forming a glass plate in a vertical position has a configuration as shown in FIG.

That is, the upper side of the glass plate 100 is held by a hanger, the glass plate 100 is heated in the heating furnace 101 to near its softening point, and the glass plate 100 is removed from the heating furnace 101 by moving the hanger upward. The heated glass plate 100 is placed between the male mold 102 and the female mold 103, and these molds 10
2,103, the glass plate 100 is press-formed into curved glass, and this curved glass is exposed to a quenching section 105 in which a large number of cooling nozzles 104 are installed. Cooling air is blown onto the glass to create surface compressive stress, creating tempered glass.

In such conventional devices, since the press section and the quenching section are not located at the same location, it takes time to transport the press-formed glass plate to the quenching section, and as a result, the glass surface cools during transportation. As a result, the degree of reinforcement cannot be increased, and as shown in FIG. 2, the number of fractures is smaller than that of tempered glass that is rapidly cooled immediately after pressing, making it impossible to satisfy safety standards.
In addition, creep recovery occurs during the transfer from the press section to the quenching section, and when a frame-shaped peripheral mold is used for the female mold, the temperatures on the front and back sides of the glass at the initial stage of quenching are different, and furthermore, Since the glass plate deforms due to the effects of acceleration, etc., as shown in Figure 3, the pressing mold is There is a disadvantage that there is a large difference in shape between the two.

In view of the above-mentioned disadvantages, the present inventor has devised the present invention to effectively solve the problem.The purpose of the present invention is to increase the degree of reinforcement by cooling the glass plate on the spot after forming. By doing so, it is an object of the present invention to provide an apparatus for manufacturing strengthened bent glass, which can make the thickness of the strengthened bent glass thinner, and which can significantly improve the forming accuracy.

In order to achieve such an object, the present invention provides a bending method in which a glass plate is pressed between two molds, for example, a male mold (convex mold) and a female mold (concave mold), with a glass plate hanging therebetween. In a glass manufacturing apparatus, at least one of the molds described above is provided with a press surface for forming the center portion of the glass plate, and a cooling nozzle is provided integrally or separately in the mold provided with this press surface and the other mold. Furthermore, a heat-resistant cloth material is provided between the press surface and the glass plate so as to be freely inserted and removed.

An example of the implementation of the present invention will be described in detail below with reference to FIGS. 4 to 9.

FIG. 4 is a vertical sectional side view of the press section of the manufacturing apparatus according to the present invention, in which a pair of male mold 1 and female mold 2 are arranged spaced apart in the horizontal direction. These male type 1 and female type 2 are hollow inside, so-called solid type, and are integrally provided with pipe portions 3 and 4 connected to a pressure source on the rear surface. The convex press surface 5 of the male mold 1 and the concave press surface 6 of the female mold 2 are curved with the same curvature, and the respective press surfaces 5 and 6 are curved with the same curvature.
Nozzles 9 are formed integrally with the press surface and open toward a glass plate 8 vertically suspended between the press surfaces 5 and 6 by a hanger 7. These nozzles 9 are arranged in a square shape with a distance of about 30 mm from each other with respect to the glass plate 8, as shown in FIG.

Further, bar members 10, 10 are provided between the glass plate 8 and the press surfaces 5, 6' in parallel with the glass plate 8, and these bar members 10, 10 are made of glass fiber, metal fiber, carbon fiber, silica fiber, alumina fiber, etc. Heat-resistant cloth 11, 11 made of any fiber or the like
is fixed so as to cover substantially the entire surface of the press surfaces 5 and 6. The bar members 10, 10 are movable above or to the side of the molds 1, 2, and by moving these bar members 10, 10 during cooling, the cloths 11, 11 can be moved between the glass plate 8 and the press surface 5. I try to remove it from between 6.

FIG. 6 shows another embodiment, in which only the male die 1 is a solid die, and nozzles 9 are provided on the press surface 5.
are integrally formed, and a cross 11 is provided between the press surface 5 and the glass plate 8 so as to be freely inserted and removed. Then, the female mold 12 is not made into a solid mold, but a frame-like piece 13 is attached, and the peripheral edge of the glass plate 8 is press-molded at the tip of this frame-like piece 13. 9... is coming.

7 and 8 show another embodiment of the arrangement of the cooling nozzles 9. The nozzles 9 shown in FIG. 7 are arranged in a rhombus shape with respect to the glass plate. Further, the nozzles 9 shown in FIG. 8 are arranged in a rectangular shape with respect to the glass plate. Further, in the illustrated example, the nozzle and the press die are shown as being integrated, but they may be separate bodies. Furthermore, although the nozzles 9 provided in the male mold 1 and the female mold 2 are arranged to face each other with the glass plate 8 in between, they may be arranged vertically or horizontally with the glass plate 8 in between.

The operation of the reinforced bent glass manufacturing apparatus constructed as above will be described below.

First, the upper side of the glass plate 8 is held by the hanger 7 and the glass plate 8 is carried into the heating furnace. After heating the glass plate 8 in the heating furnace to near its softening point, the hanging tool 7 is moved to take out the glass plate 8 from the heating furnace, and the glass plate 8 is suspended between the male and female molds. Face the glass plate 8. At this time, when the press surface 5 of the glass plate 8 and the male die 1 or the female die 2 is provided with a press surface, the female die 2
A cloth material 11 is interposed between the press surface 6 and the press surface 6.

Next, by operating a cylinder or the like, the male mold and the female mold are moved closer to each other, and a flat glass plate 8 is press-molded into a curved shape between the respective pressing surfaces. At this time, the glass plate 8 and the press surface 5,
Since the cloth material 11 is interposed between 6 and 6,
The temperature of the glass plate 8 does not drop significantly during pressing, and the glass plate surface is not scratched.

After that, return male mold 1 and female mold 2 to their original positions,
By moving the bar member 10, the cross member 11 is removed from between the molds, and at the same time, the male mold 1 and the female mold 2 are moved to draw a fixed trajectory such as a straight line, circle, or ellipse in a vertical plane. Tsutsu nozzle 9...
Cooling air is blown onto the surface of the glass plate 8.

Then, for example, if the nozzles 9 are arranged in a square shape as shown in FIG. 5, the arrow A in FIG.
A principal stress in the direction shown by is formed on the surface of the glass plate 8. Since glass fragmentation progresses in a direction perpendicular to the principal stress direction, there is no possibility of splines (elongated broken pieces) being generated.

The glass plate 8 thus strengthened is slowly cooled in a secondary cooling section (not shown) to form a product.

As is clear from the above description, according to the present invention, at least one of the molds for bending the glass plate is provided with a press surface for forming the central part of the glass plate, and a cooling nozzle is also provided. Rapid cooling can be performed at the forming position, and therefore, the glass plate surface can be rapidly cooled before it cools down, and the degree of reinforcement can be improved. For this reason, it has become possible to make the thickness of reinforced bent glass as thin as possible. In addition, since a cloth material is interposed between the glass plate and the press surface during pressing, there are no press marks left on the surface of the glass plate, and the temperature of the glass surface does not drop due to contact with the press surface during press. It can be prevented. Moreover, since the glass plate can be rapidly cooled immediately after pressing, the glass plate is less deformed, and the difference in shape from the press die can be minimized, resulting in many effects such as being able to obtain reinforced bent glass with high molding accuracy.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention and a conventional example. Fig. 1 is a side view of a conventional device, Fig. 2 is a diagram showing the relationship between glass temperature and the number of fractures during rapid cooling, and Fig. 3 is a diagram showing the relationship between the glass temperature during quenching and the shape difference between the press mold, FIG. 4 is a longitudinal cross-sectional side view of the press part of the apparatus according to the present invention, and FIG. 5 is a front view showing the arrangement of nozzles. , FIG. 6 is a longitudinal sectional side view similar to FIG. 4 showing another embodiment, FIGS. 7 and 8 are front views showing the nozzle arrangement of another embodiment, and FIG. 9 is a main view of the tempered bent glass. FIG. 3 is a plan view showing the direction of stress. In addition, 1 in the drawing is a male type, 2 and 12 are female types,
5 and 6 are press surfaces, 9 is a cooling nozzle, and 11 is a cloth material.

Claims (1)

[Scope of Claims] 1. A bending glass manufacturing apparatus in which a glass plate is vertically suspended between two pressing dies, and the glass plate is press-formed between the dies. At least one of the two molds is provided with a press surface for forming the central portion of the glass plate, and the mold in which the press surface is formed and the other mold are provided with a cooling nozzle, and the glass plate faces between the molds. A manufacturing device for reinforced bent glass, characterized in that a cross member is freely inserted and removed between the press surface and the press surface. 2 The above two types consist of a male type and a female type,
The tempered bent glass according to claim 1, characterized in that among these molds, the mold forming the pressing surface is hollow box-shaped, and the cooling nozzle is formed integrally with the pressing surface. manufacturing equipment. 3. The apparatus for manufacturing reinforced bent glass according to claim 1, wherein the cooling nozzles are arranged in a square shape with respect to the glass plate. 4. The apparatus for manufacturing tempered bent glass according to claim 1, wherein the cooling nozzles are arranged in a diamond shape relative to the glass plate. 5. The apparatus for manufacturing tempered bent glass according to claim 1, wherein the cooling nozzles are arranged in a rectangular shape with respect to the glass plate.