KR900004105B1 - A ring mold for shaping glass sheet - Google Patents

Abstract

A glass sheet for an automobile windscreen is manufactured by the stages of heating a glass sheet at the melting point, shaping it with an upper metal-mould and a lower ring mould. The lower ring mould has many prominence and depression on the upper surface and many holes at regular intervals, is coated with a punched and roll-pressed metal plate of 0.1-0.5 mm thickness. The produced glass can be free from distortion, the mould being easily changed in shape.

Description

Ring Mold for Glass Sheet Forming

1 is a partial cutaway view of a molding ring mold.

2 is a partially cutaway side view of the molding ring mold.

3 is a molding ring mold coated with the punching metal of the present invention.

4 is an enlarged plan view of the punching metal shown in FIG.

5 is a partial perspective view of the punching metal before performing a roll press.

6 is a partial side view of the punching metal subjected to roll press.

* Explanation of symbols for main parts of the drawings

1: ring mold 2: main part

3: through-hole 4: punching metal

5: opening

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a molding apparatus for molding curved tempered glass for automobiles, and more particularly to a ring mold that supports and forms a glass sheet edge.

In the glass sheet forming system, for example, a method of forming a curved tempered glass sheet for automobiles is generally performed by heating a flat glass sheet to a softening point in a heating furnace, and heating the heated glass sheet to a heating furnace. The glass sheet is bent to a desired curvature using the upper and lower molds installed in the molding apparatus while conveying from the plurality of conveying rollers installed in the molding apparatus to the molding apparatus, and a suitable cooling medium is strongly blown onto the curved glass sheet. Then it is in each step of strengthening.

In conventional bending molding, attempts have been made to support the periphery of the glass sheet using a ring mold and to increase the bending accuracy of such periphery.

Moreover, even when cooling the glass sheet bent and molded in the molding apparatus, the glass sheet was supported by the same ring mold.

However, when the glass sheet is supported by the ring mold when the glass sheet is rapidly quenched and strengthened, cooling air enters between the glass sheet and the ring mold, and the cooling air reaches the edge of the glass sheet sufficiently. There is a problem that can not strengthen the edge.

In view of this, a ring mold has been proposed in which a plurality of recesses are formed on the upper surface of the ring mold in contact with the glass sheet, and the cooling air can be supplied to the vicinity of the edge.

However, the use of this type of ring wool also has problems such as uneven marks on the surface of the glass sheet to be formed because of its surface shape.

In order to solve the above problems, a ring mold for forming a glass sheet in which a metal woven fabric made of stainless steel fiber is placed on the uneven surface of the ring mold in contact with the glass sheet is also disclosed in Japanese Patent Laid-Open No. 59-149934 Is disclosed.

Molding by such a structure does not directly contact the glass sheet with the low-temperature ring mold, and also eliminates the problem of leaving uneven marks on the glass sheet. On the contrary, the discharge of cooling air is reduced.

As a result, as in the prior art, the edges of the glass sheet could not be strengthened equally with other parts.

An object of the present invention is to provide a ring mold for forming a glass sheet which does not leave uneven marks on the surface of the glass sheet.

It is another object of the present invention to provide a glass sheet forming ring mold in which cooling air is eliminated.

According to the present invention, in a ring mold for supporting a glass sheet when quenching and strengthening the glass sheet heated up to the softening point by cooperating with the upper and lower molds and forming and bending the glass sheet formed by a suitable cooling medium, As shown in detail in FIG. 1 and FIG. 2, the ring mold 1 has a plurality of recesses 2 on the upper surface thereof at irregular intervals, and cooling air is easily removed from the recesses 2. I'm trying to.

In addition, a through hole 3 formed in the vertical direction is provided between the recesses 2 to promote cooling air.

As shown in Fig. 3, the punching metal 4 is coated over the entire surface of the ring mold 1 according to the present invention. This punching metal 4 is preferably formed from stainless steel below.

In addition, in this punching metal 4, as shown in FIG. 4, many rhombic openings 5 are formed by drilling a hole. Therefore, in the present invention, the uneven portion is formed on the upper surface of the ring mold 1 supporting the glass sheet and the punched metal 4 is coated to form the heated glass sheet and strengthen the cooling. By preventing direct contact between the ring mold 1 and the uneven marks on the glass sheet will be left.

In this case, if the size of the opening 5 formed in the punching metal 4 is too large, the glass sheet tends to be in direct contact with the ring mold 1, while if too small, the cooling air is reduced in discharge.

In consideration of the advantages punching metal (4) is 0.5mm thick 0.l-opening area ratio of the length S ₁ of the inside longitudinal diagonal of about 40% or more, the opening 5 is 0.5-5.0mm, a short side length S ₂ is The width S ₃ of 0.5-2.0 mm and the lattice portion is preferably about 0.1-1.5 mm.

In addition, when punching the punching metal 4, unevenness remains as shown in FIG. 5, but when it is used in this state, an upper limit trace of unevenness occurs on the glass sheet. Is added to keep the metal surface flat as shown in FIG.

As described above, the present invention is to cover the ring mold formed with the concave-convex portion for releasing the cooling air with the punching metal, the plate glass is not directly in contact with the ring mold, greatly reducing the probability of splitting the glass plate, the surface of the punching metal Since the flat glass is not scratched and the opening ratio required for the punching metal can be secured, the cooling air can be smoothly discharged during quenching, and the flat glass magnetic field can be uniformly and sufficiently strengthened.

Claims (5)

A ring mold for supporting a lower edge of a glass sheet heated to a softening point and cooperating with a mold to bend and shape the glass sheet, and to support the glass sheet when quenching and strengthening the bent molded glass sheet. A ring mold for forming a glass sheet, characterized in that the ring mold is covered with a punching metal (4) having a plurality of recesses (2) on the upper surface and having a plurality of openings (5). The ring mold for forming a glass sheet according to claim 1, wherein the recesses (2) of the ring mold (1) are provided at suitable intervals. The ring mold for forming a glass sheet according to claim 1, wherein the punching metal (4) is roll-pressed. 2. The ring mold for forming a glass sheet according to claim 1, wherein the punching metal (4) is preferably about 0.1-0.5 mm thick. 2. The opening (5) of the punching metal (4) according to claim 1, wherein the opening (5) of the punching metal (4) is rhombic, and the opening area ratio is about 40%, the long diagonal is about 0.5-5.0 mm, and the short diagonal is about 0.5-2.0 mm. Ring mold for glass sheet molding reinforcement characterized in that.

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