JPS6355128A - Production of thin plate glass - Google Patents

Abstract

PURPOSE:To produce a thin plate glass in high yield of original plate glass, by heating an original plate glass at a temperature above the softening point and stretching the glass to a thin plate glass, wherein the rear edge of the preceding original plate glass is successively welded to the front edge of the following original plate glass. CONSTITUTION:An original plate glass G is clamped with chucks 13, 13 of a feeding apparatus (a) furnished with a 1st sliding table 4. The lower end of the glass G is supported by a 2nd sliding table 20 and placed opposite to the preceding original plate glass G supported by a 3rd sliding table 30 at its upper end. The oppositing edges of both plates G, G are heated and welded with a welding burner 33. The welded plate glass is introduced into a heating apparatus (c) at a constant speed, heated to the softening point and redrawn with a drawing apparatus (d) to obtain a thin plate glass having a definite thickness. The operation is successively repeated to convert a number of original glass plates into a thin plate glass in high yield of the raw material.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a method for producing thin glass by lead-drawing (glass plate remolding method) original glass plates.

Conventional technology Thin glass of 1 fl or less used for displays such as blood crystals is produced using the Fullcor method, which manufactures ordinary sheet glass.
Depending on the slit-down method, etc., there is a drawback that warping, bending, or wrinkles are likely to occur, resulting in poor surface accuracy. In order to overcome this drawback, a sheet glass re-forming method is known as a method for manufacturing thin sheet glass (for example,
Publication No. 83).

The plate glass remolding method described above involves heating a thick (eg, 5 mm thick) original plate glass to a temperature higher than its softening temperature, and then stretching it to reshape the glass to a thinner cross section (eg, 0.1 W thick). According to this remolding method, the feeding speed of the original plate glass,
A desired plate thickness can be easily obtained by changing the setting of heating capacity or pulling speed.

The original plate glass used in the above-mentioned plate glass re-forming method is cut into predetermined shapes in advance, and each time the upper end of each sheet is chucked and transferred to the re-forming device. Since the chucked portion cannot be heated and softened, there is a problem in that the utilization rate of the original sheet glass is reduced accordingly. In addition, because the original glass sheets are intermittently fed one sheet at a time to the re-forming equipment in a batch manner, the drawing conditions are discontinuous, such as the temperature of the heating furnace fluctuating until the next glass sheet is supplied. Therefore, there was a problem that it became difficult to obtain homogeneous thin glass.

According to this invention, in a method of manufacturing thin glass by heating a base glass to a temperature higher than its softening temperature and stretching it, the leading edge of the next base glass is attached to the trailing edge of the preceding base glass. The parts are sequentially welded and supplied.

Since this invention has the above-mentioned configuration, the original plate glass can be continuously supplied to the re-forming device, and the loss of the original plate glass can be reduced.
Production loss time and heating furnace temperature fluctuations can be eliminated.

1. The following is a description of an apparatus for carrying out the method of the present invention with reference to the embodiments shown in the drawings. That is, the configuration of the device is as follows: base plate supply device (a), edge welding device (b)
, a heating device (C) and a root pulling device (d) are arranged in a chain, and arbitrary root pulling conditions can be achieved by controlling the respective drive devices provided in the base plate supply device (a) and the root pulling device (d). That's how you get it.

The original plate supply device <a> that sends the original glass plate (G) downward is
Connect the machine base (1) and machine head (2) to the support (3)
are connected and fixed at predetermined intervals to form the machine frame. A pole screw (5) with a first slide base (4) screwed thereon is inserted between the machine base (1) and the machine head (2) along this support (3). The upper end of the pole screw (5) is supported by the bearing (6) of the machine head (2), and the lower end protrudes through the bearing (7) of the machine base (1), and the gear (8) at the lower end is supported by the drive motor (9). Engage the gear (10). By switching the rotation direction of the drive motor (9), the slide base (4) screwed onto the pole screw (5) can be rotated.
) moves up and down along the column (3) at a predetermined speed.

The slide table (4) has an air cylinder (15) that opens and closes a chuck arm (14) that is integrally provided with a first chuck (13) that grips the upper end of the original glass plate (G).

Next, the edge welding device (b) will be explained. This device (b) has a second slide stand (20) and a third slide stand (30), and these slide stands (20> (
30) is screwed into the pole screw (23) (23a) driven by the same drive device as the first slide base (4), and the column (
3), each slide platform (20) can be raised and lowered along the
(30) includes a pair of second chucks (21) and (22) that grip both ends of the original plate glass (G) and a pair of third chucks
Mobile platform (24) with chucks (31) (32)
(25) (35) (36) are air cylinders (2
6) (27) (37) (38) are provided movably on both sides of the original plate glass (G), and the second chuck (21) (22) and the third chuck (31 ) (32) is the air cylinder (2
B) (29) (39) (40) can be opened and closed. The above moving table (24) (25)
(35) (36) is omitted from the second chuck (2
1) (22) and the third chiak (31) (32)
may be directly attached to the slide stand (20> (30)).

A welding burner (33) for heating the edge of the original glass plate (G) is integrally fixed to the third slide table (30).

The heating device W <c> is installed on the machine base (1) below the third slide table (30), and the original plate glass (G
), and heating elements are arranged so as to face both sides of the base glass CG') that passes through the slit, and the base glass CG'), which is fed by the base plate supply device (a), is heated by heating elements. The plate glass (G) is heated and softened sequentially from the bottom to the top.

At the bottom of the heating device ffl (C), there are arranged in a vertical line a root pulling surface (d) having a roller mechanism for forcibly pulling the softened original plate glass (G).

The above is the overall configuration of the device, and the operation will be explained below.

First of all, the original glass plate CG) is held at its upper end by the first chuck (13) of the original plate supply device (a), and at its lower end by the second chuck (21) (22). Then, the three pole screws (5) (23) (23a) rotate synchronously, and the first to third slide bases (4) (2
0) (30) is the original plate glass (
G) is lowered to supply it to the heating device (C).

When the second slide stand (20) reaches the lowest limit of its descent, the second chucks (21) and (22) open to release the grip on the lower end of the original plate glass (G), and the second slide stand (20)
0) rises to the intermediate original position and waits to grip the next original glass plate.

After the third slide table (30) reaches the lowest limit below the second slide table (20), the third slide table (30) rises together with the second slide table (20) and waits with the chuck opened at the original position. (See Figure 4 ■) The first slide stand (4) is connected to the second and third slide stands (20
) (30) continues to descend while rising, supplying the original plate glass (G) to the heating device.

When the first slide base (4) descends to the upper end position of the second slide base (20), the second and third slide bases, which had been stopped until then, descend again in synchronization. (4th
(See Figure ■) During this synchronous descent, the third chucks (31) (32) of the third slide stand (30) grip the upper end of the original plate glass (G), and the first chuck of the first slide stand (4) Check (13)
) opens and releases its grip, and the original plate glass (G) is transferred to the third chuck (30).

Uke hands over the original plate glass (G) and moves to the first slide stand (4).
returns to the starting point of the highest limit, the second slide table (20) also returns to the intermediate position and stops, and the chuck (1
3) Open (21) and (22) and wait. Third
The slide table (30) continues to descend at a constant speed while gripping the original plate glass (G).

Next, the second original plate glass (G) is supplied to the original plate supply device <a
(see Fig. 4 ■), and the lower end is attached to the second chuck (20) of the second slide base (20).
1) Let (22) chuck it. When activated at the same time, the first slide stand (4) and the second slide stand (20) synchronize and descend at a fast speed that allows them to catch up with the third slide stand (30). (See Figure 4 ■) The upper (two-pane) original glass plate (G) is the lower original glass plate (G).
) as you catch up and approach it, you will see the first slide platform (4) and the second slide platform (20)! It returns from a fast speed to a constant speed (see Fig. 4) and descends in synchronization with the third slide table (30). During this synchronous descent, the upper and lower original glass plates (G
) (G) is measured with a sensor, and after or in parallel with the measurement, a welding burner (33) is ignited to heat and soften the edges of the upper and lower original glass sheets (G) (G). When the heating and softening of the edges is completed, the welding burner (33) is extinguished, and the first slide table (4) and the second slide table (20
) is lowered at a faster speed than the third slide table (30) by the size necessary for welding the edge in consideration of the measurement gap dimension, and when the edge is welded (see Figure 4 O), the first The slide stand (4) and the second slide stand (20) are momentarily turned off (see Fig. 4 (2)), and then lowered in synchronization with the third slide stand (30).

The above process is performed on the original plate glass CG as shown in Fig. 3(a).
) (G) is heated and softened with a welding burner (33),
Weld them close together as shown in Figure (b), and then weld them together as shown in Figure (C).
), when the feeding of the upper original glass plate (G) is momentarily stopped, the upper and lower original glass plates (G) (G) are pushed together by − degrees and then pulled a little. The welded area becomes smooth as shown in Figure (d), and there is less dimensional variation in the plate after lead drawing.

When welding is completed in this way, the second chuck (21
) (22) and third chuck (31) (32)
opens, returns to the intermediate position, and waits.

As mentioned above, the original glass plate (G) to which the next original glass plate (G) is welded is not held by the first chuck (13) and sent to the heating device (C) at a constant speed, so the welding part is also at a constant speed. Sent by After that, the original plate glass (G) is heated at a constant speed by the heating device (c).
), and is continuously lead-drawn into thin sheet glass of a predetermined thickness using a root drawing device (d).

In the above process, the first slide stand (4) is gripped by the first chuck (13), and the second slide stand (4) waits at an intermediate position.
When you approach position 20), the second slide stand (20)
and the third slide stand (30) are lowered in synchronization with the first slide stand (4), and during this time the third chuck (31) (
32) grips the original plate glass (G), and the first chuck (1
3) is opened, the first slide table (4) quickly returns to the upper end, and the second slide table (20) also returns to the intermediate position.

However, the third slide table (30) continues to descend at a constant speed, and during this time the next original plate glass CG) is moved to the first chuck (1
3) and the second chuck (21) (22), and
The first slide table (4) and the second slide table (20) are lowered at such a fast speed as to catch up with the slide table (30), and the welding operation is performed again.The above operation is repeated thereafter. 4 is an example of a time chart of the chuck points of the first to third slide tables.In addition, in FIG.
The lower end position of the slide table overlaps the upper end position of the second slide table, but this is because the position is expressed by the position of the chuck point of the first chuck (13).

According to this invention, it is possible to significantly reduce the loss of the original plate glass, and it can be manufactured continuously, which improves productivity, and also makes it possible to uniformize the rooting conditions such as the temperature of the heating furnace. Homogeneous thin glass can be produced.

[Brief explanation of the drawing]

FIG. 1 is a side view of the implementation device of the present invention, FIG. 2 is a front view,
FIGS. 3A to 3D are explanatory diagrams of the welding process, and FIG. 4 is an example of a time chart of chuck points of the first to third slide bases. (a) --- Original plate supply device, (b) One edge welding device, (C) --- Heating device, (d) ---
Nebiki device, (G) -- Original plate glass, (4) --
First slide stand, (20) - Second slide stand, (30
)・-・3rd slide stand. Figure 1 2nd medical entrance [====here

Claims (1)

[Claims] (1) In a method of manufacturing thin glass by heating original glass to a temperature higher than its softening temperature and stretching it, the leading edge of the next original glass is sequentially welded to the trailing edge of the preceding original glass and supplied. Characteristic thin glass manufacturing method.