FI87643B - BOEJNINGSFORM FOER GLAS OCH FOERFARANDE ATT BOEJA GLAS - Google Patents

Description

1 87643

GLASS BENDING MOLD AND METHOD FOR BENDING GLASS

The invention relates to a glass bending mold or glass support members in glass processing systems such as tempering devices. The invention improves the versatility of the mold and the circulation of heating and cooling air, especially on the lower surface of the glass.

It is already known in Finnish. Publication No. 80870 discloses a glass bending mold in which elongated tubes are used to form a curved mold on which the glass bends when heated. The tubes can be oscillated at the same age at the end of the bending phase, thus avoiding permanent line contact. According to each bending shape, there must be separate form plates supporting the pipes.

Em. The disadvantages of the solution according to the publication are that the pipes have to be brought out of the furnace by means of a special bushing so that they can be moved by means of a certain lever system. In addition, the bearing surface of the pipe must act as a bearing and there is a problem of wear during high temperature movement. Even a small change in the bending radius requires new shaping plates. When the tubes forming the curved mold shape have a certain distance from each other, during the bending phase of the glass, the edge of the glass falls from one tube to another, because the glass, when bent, is no longer as wide as originally straight on top of the tubes. The width of the straight glass can also be unsuitable for the pipe division, so that the glass cannot be placed stably on the pipes alone. It is very difficult to build intermediate supports between pipes. There are also problems in the tempering stage in the mold according to the above-mentioned publication, because the pipes prevent air circulation on the lower surface of the glass. The tubes cool faster in the cooling phase than the glass, causing local temperature differences. Furthermore, in the mold, bending is only possible in one direction and it is not ... possible to obtain a barrel-like shape.

The method and mold according to the invention provide a decisive improvement over the above-mentioned drawbacks and completely avoid certain disadvantages. The invention is characterized by what is stated in the claims.

The most important advantages of the invention are that cooling and heating air can also circulate on the lower surface of the glass. Rotation of the support tubes can be dispensed with, because the glass plate cools quickly even from its lower surface and thus contact marks are not created very easily. Likewise, the support tubes are simple tubes arranged only on top of the form plates. The support of the edge of the glass sheet can be arranged in a simple manner and by using replaceable and movable sleeves of different sizes as glass contact members, barrel-like shapes and free air circulation under the glass sheet are obtained.

In the following, the invention will be explained in more detail with reference to the accompanying drawing, in which Figure 1 shows a part of a bending mold.

Figure 2 shows a replaceable and movable sleeve.

Figure 3 shows the bending of the glass when viewed from the end.

Figure 4 shows a side view of the glass edge support. Figure 5 shows a glass edge support.

Figure 1 shows a part of a bending mold or glass support mold formed by tubes 2 'placed on top of a mold plate 1, "in which sleeves 3 are mounted on the tubes. The sleeves 3 actually support the glass. The mold plate 1 has grooves for each tube so that they remain freely spaced apart. move along the tubes and barrel-like • bending is obtained when higher sleeves are placed as the mold head approaches.The sleeves are preferably made of poorly thermally conductive material such as ceramic rings.The sleeves must also withstand high temperatures of at least 600 ° C.The sleeves ensure air circulation even during the cooling phase when the glass sheet has landed on the surface of the mold ____ ;.

When using the same shape plates 1, slightly different bending shapes can be obtained when the final shape of the glass is adjusted at the height of the slings. In this case, for example, the pipes coming to the edge parts of the mold are provided with the highest sleeves and the sleeves are lowered evenly in those pipes which are always located lower and lower at the bottom of the mold. Correspondingly, the bending can be tapered by the opposite slender height arrangement.

In addition, slightly different bending shapes are achieved by using sets of sleeves of different heights with the same shapes and tubes. By replacing the lower set of sleeves with a higher set of sleeves, a slightly more curved shape is obtained. Such closely spaced bending shapes are needed in bent insulating glass and multiple window glass.

Figure 2 is a sectional view of a sleeve 3. The outer surface of the sleeve is slightly barrel-shaped, thus avoiding possible sharp depressions in the glass.

Figure 3 shows the bending event of the glass 5 on the sleeves 3. It can be seen from the diagram how, due to bending, the width of the glass decreases and the glass 5 'falls from the supports ··· to the lower supports. Falling causes either glass:. breakage or subsequent shape defect at the • edge of the glass.

Figure 4 shows a side view of a glass edge support that can be mounted on two adjacent tubes 2. The support is supported on the tubes 2 by means of brace-like projections 7. ·. so that the height of the support surface 6 of the support is very close to a straight line passing through the upper surfaces of the adjacent slender 3 as shown by the broken line. The brackets can be ... · easily installed where they are needed at any given time.

Figure 5 shows the support seen obliquely and mounted on the pipes 2. The support surface 6 of the bracket is divided into parts, 4 87643, so that the bracket does not interfere with air circulation. The upper surface of the support can also be adjusted to the plane of the glass plate so that the brackets 7 of the support have grooves in the tube 2 and the parts 6 are then adjusted to the plane formed by the tubes 2. This is the case when separate sleeves 3 are not used on the edge part.

The fastening of the edge supports according to the invention is characterized in that the pipes 2 must be provided with either platform parts or grooves for the bracket members 7, whereby the grooves between the pipes act as platform parts so that the edge support can be fastened to the pipes. The platform parts and the edge supports are thus interdependent, providing an inventive improvement over known methods and devices.

The invention is not limited only to the embodiments shown, but can be modified within the scope of the inventive idea defined by the appended claims. Platform parts such as bushings can be freely placed on the support members and can be in the more frequent edge areas and less frequently in the bottom areas of the mold. Barrel-like is achieved when the platform parts are at the ends of the mold or the platform parts are higher at the ends of the mold.

Il

Claims (8)

A method for bending or supporting glass in devices in which the shapes or properties of the glass are changed and which devices consist of elongate glass-supporting members (2) arranged or moved substantially to correspond to the desired shape of the glass, characterized in that the falling edge of the glass in the bending situation, the support member (6) formed between the elongate members (2) is blocked from one support member (2) to another. Method according to Claim 1, characterized in that the additional supports (6) rest on the members (2). Method according to Claim 1 or 2, characterized in that the male supports (6) rest on grooves formed in the members (2) or on the surface of the members (2) by means of bracket-like parts (7), the members (2) being provided with glass-supporting lifting parts ( 3). Method according to Claim 3, characterized in that the lifting parts (3) are interchangeable and, by varying their heights, different bending shapes of glass are formed. 5. A glass bending mold or support device comprising a long · · ·. angular members (2) on which the glass is lowered and which are arranged substantially in the shape or transition to the shape desired for the glass, characterized in that in the space between the members (2) there are glass 1-supports (6) ) at the level passing through the upper surfaces. 5,87643 Mold or support device according to Claim 5: - characterized in that the male supports (6) rest on the members (2). 6 87643 Mold or support device according to Claim 5 or 6, characterized in that the members (2) are provided with platform supports (3) of the desired height for supporting the glass. Mold or support device according to Claim 5 or 6, characterized in that the support members (2) are provided with grooves on which the male supports (6) rest.