JPS6389421A - Device for forming sheet glass - Google Patents

Abstract

PURPOSE:To remarkably reduce the variations in the thickness due to the hot bending of a forming die by fixing a thickness adjusting ring to the end of the peripheral side surface of the forming roll, and pressing one forming roll on the other in the roll-out type forming device. CONSTITUTION:The shaft ends of the upper forming roll 11 are supported by bearing blocks 12a and 12b, and the blocks are elastically pressed and energized by compression springs 13a and 13b. Meanwhile, the shaft ends of the lower forming roll 14 are freely rotatively fixed and supported by bearing blocks 15a and 15b fixed to a housing. The thickness adjusting rings 17a and 17b and 18a and 18b having approximately the same height as that of the sheet glass are fixed to the ends of the peripheral side surfaces of the rolls 11 and 14 as the thickness adjusting means for the sheet glass which is hot-rolled while leaving a specified interval between the rolls. The rolls 11 and 14 are rotated, and a rolling load is exerted on the molten glass 16 fed into the space between both rolls.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for molding plate glass with no wall thickness variation and high dimensional accuracy.

A roll-out plate glass forming apparatus is used as an apparatus for rolling molten glass between a pair of upper and lower forming rolls to form a plate glass. The surface shape and thickness of a plate glass manufactured by such a hot rolling type forming apparatus are determined by the surface shape of the forming rolls and the gap size between the forming rolls disposed in a pair above and below.

(5) In such a roll-out plate glass forming device, the forming roll is heated by heat conduction from the molten glass, which inevitably causes curvature, which causes dimensional changes such as uneven thickness in the rolled plate glass. For this reason, products with good dimensional accuracy cannot be obtained, and there has been a strong demand for a solution to this problem. The upper forming roll (1) and the lower forming roll (2) are connected to a drive source [not shown] with both ends supported by bearing blocks (3) fixed to the fluid, and the molten glass (4) is connected to a driving source (not shown). ), but at this time, the forming rolls (1) and (2) are pressed against the high-temperature molten glass, so the temperature rises to 600°C due to heat conduction from the molten glass.
This thermal energy, which is heated to a high temperature before and after, is transmitted to the bearing block (3) via the forming rolls (1) and (2), damaging the bearing block (3) or reducing the bearing function. The span length (
La) is the width dimension C1 of the molten glass (4) to be rolled.
＞, specifically, set it to twice or more. However, a fatal problem with conventional equipment is that as the span length (La) of the bearing block increases, the degree of curvature of the forming rolls (1) and (2) increases due to pressure contact with the high-temperature molten glass (4). Some shortcomings are recognized.

A main object of the present invention is to provide a means for solving the problem of wall thickness variation of a glass plate caused by hot curvature of a forming roll, which has been a problem in conventional roll-out type glass plate forming apparatuses.

As a means of solving such problems, the present invention provides an apparatus for rolling molten glass between a pair of forming rolls to form a plate glass, in which a predetermined opposing interval is placed at the end of the circumferential side of the forming rolls. The present invention provides a roll-out type plate glass forming apparatus in which a thickness adjustment ring for defining the thickness of the plate glass is fixed, and one forming roll is brought into pressure contact with the other forming roll.

In addition, a thickness adjustment ring fixed to the end of the circumferential side of the forming roll at a predetermined distance from each other functions as a member for reducing the amount of curvature of the forming roll, and eliminates variations in the thickness of the glass plate rolled by this forming roll. do.

FIG. 1 is a schematic front view of a roll-out type plate glass forming apparatus according to the present invention. As shown in the figure, the shaft end of the upper forming roll (11) has bearing blocks (12a) and (12b).
), and the cough bearing block is supported by a compression spring (13
a) and (13b) are elastically biased toward the lower forming roll (14). Instead of this elastic pressing means, it is also possible to use the weight of the upper forming roll (11) to press the upper forming roll (11). On the other hand, the shaft end of the lower forming roll (14) is rotatably fixedly supported by bearing blocks (15a) and (15b) fixed to the housing. In this state, the upper forming roll (11) and the lower forming roll (14) are rotationally driven by a motor (not shown) to apply a rolling load to the molten glass (16) fed between the forming rolls. , an upper forming roll (11) and a lower forming roll (1
Thickness adjustment rings (17a), (17
b) and (18a) and (18b) are fixed.

Since the device of the present invention is constructed as described above, the bearing blocks (12a), (12b) and (15a), (1
The rolling dimensions of the molten glass that effectively avoid deterioration of the bearing function due to heat by arranging 5b) on the surface sufficiently far from the rolling area of the hot molten glass (16) are as follows:
The bearing blocks (12a), (12b) and (15a), (1
5b), that is, the span length (La) of the upper forming roll (11) and the lower forming roll (14) is the same as the conventional device, the thickness adjustment ring (17a) and (1
7b) or the opposing distance between (18a) and (18b) (
Lb ”) measured at the center of the rolling zone by the forming roll (
11) The maximum eccentricity it (Emax) is regulated.

To explain in more detail, the maximum eccentricity (Emax)
If the maximum eccentricity of the forming roll (1) in the conventional device corresponding to is expressed as (E'max), Emax = F
,'wax -Lb/La, for example, Lb/L
When a=%, the maximum eccentricity (Emax) is the eccentricity (E'max) of the conventional device shown in FIG. 2, as shown by the two-dot chain line.
x) is reduced to approximately A. To give a more specific example, the second
If a hot eccentricity of 0.1 mm occurs in the center of the forming roll (1) in the conventional device shown in the figure, in the device of the present invention shown in FIG. Then, the hot eccentricity of the upper forming roll (11) is halved to 0.05 fl.

The apparatus of the present invention has been described above in detail based on the description of the embodiments, but the scope of the rights of the present invention should not be construed as being limited thereby, and may include numerous modification examples. As the pressing means, the compression spring (13a),
(13b) It is possible to use a fluid pressure cylinder device such as an air cylinder device or a hydraulic cylinder device, and it is also possible to use the weight of the roll as described above. The thickness adjustment ring may be provided only on either the upper forming roll (11) or the lower forming roll (14). These thickness adjustment rings are attached to the forming roll (1
1), (14) are manufactured from a metal material with approximately the same hardness and compressive strength, but have multiple sets of thickness adjustment at different heights to accommodate changes in the thickness of the rolled glass sheet. Rings may be prepared in advance, and these thickness adjustment rings may be selected and used according to changes in rolling conditions.Also, although the above embodiment describes a roll-out plate glass forming apparatus, the technology of the present invention Thoughts are not limited to this.

As can be understood from the above explanation, thickness adjustment rings are fixed to the peripheral side edges of the forming rolls at predetermined spacing, and the thickness adjustment rings are interposed between the forming rolls. By applying a downward pressing force, it is possible to significantly reduce variations in the wall thickness of the sheet glass rolled between these forming rolls along the feeding direction.

Thus, the present invention is aimed at preventing wall thickness variations along the feeding direction of sheet glass due to hot bending of the forming rolls, as well as functional deterioration of the bearing blocks of the forming rolls due to heat conduction from the molten glass. It is possible to achieve effects that significantly exceed the standards of conventional equipment.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of a sheet glass forming apparatus according to the present invention, and FIG. 2 is a schematic front view of a conventional apparatus. (IIL--forming roll, (12) (15)--bearing block, (13)-
- Pressing means [compression spring], (14) - Forming roll, (16) - Molten glass. Patent applicant Nippon Electric Glass Co., Ltd.
Mr. Gangwon Sho Go M1 Figure 2

Claims (1)

[Claims] (1) In an apparatus for rolling molten glass between a pair of forming rolls and forming it into a plate glass, a thickness adjustment ring for regulating the thickness of the plate glass is fixed to the peripheral side end of the forming roll at a predetermined opposing interval. A sheet glass forming apparatus characterized in that one forming roll is brought into pressure contact with the other forming roll.