JPH09301721A - Method for cooling glass formed body and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the cooling deficiency of a glass formed body and to shorten cooling cycle time by simple constitution by cooling the glass formed body with a specific method at the time of producing the glass formed body by press forming fused glass by a prescribed method, then cooling the formed body. SOLUTION: This process for producing the glass formed body 1 comprises supplying the fused glass to a lower die 2, then lowering an upper die to press form the glass and rising the upper mold to open the dies and is succession, taking out the formed body 1 after cooling the formed body with the lower die 2. In this process, the cooling from the upper part of the glass formed body 1 in the lower die 2 is executed by the cold air sent from a duct 5 composed of inside and outside double pipes 3, 4 at the time of cooling the formed body 1. The cold air from separate fans 6, 7 are preferably sent into the respective pipes 3, 4 of the duct 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for efficiently cooling a glass molded body immediately after pressure molding in a process for manufacturing a glass molded body such as a panel for a cathode ray tube.

[0002]

2. Description of the Related Art As a method for producing a glass molded body, a certain amount of molten glass is supplied to a lower mold, and then the upper mold is lowered to perform pressure molding, and then the upper mold is raised to open the mold, followed by continuous molding. A general method is to take out the molded product after cooling it in the lower mold. This manufacturing method will be described by taking a panel which is a main glass component of a cathode ray tube as an example.

First, a predetermined amount of molten glass gob called a gob is supplied to the lower mold. The lower mold on which the gob is placed is then carried to the press position, where the upper mold is lowered and the gob is pressure-molded into the shape of the panel.

At this time, the glass is rapidly cooled by the pressurization, but after that, even after the upper mold is lifted and the mold is opened, the glass is continuously cooled in the lower mold until the temperature at which the panel, which is a molded body, can be taken out. Done. This cooling is sequentially carried to a plurality of cooling positions for each lower mold. In each cooling position, the contact surface of the panel with the lower mold is cooled by the lower mold,
The surface not in contact with the mold is cooled by supplying cold air from above.

FIG. 2 is a basic configuration diagram showing a state in which the panel inner surface is cooled after the upper mold is opened. As shown in FIG.
The panel 1 is placed in the lower mold 2, and the inner surface thereof is cooled by the cool air sent from the duct 5 located above. In this cooling process, as long as the panel is still hot and soft, cooling is performed with a focus on preventing collapse of the side surface of the panel rather than cooling efficiency called an air former, and thereafter, cooling efficiency is emphasized. The cooling was done. The latter, which focuses on the cooling efficiency, is usually performed by blowing cooling air from a blower onto the panel from a duct having a circular cross section.

In this way, the panel, which has been sufficiently cooled so that the deformation in the subsequent handling is not a problem, is taken out from the lower mold and sent to the next step, and the lower mold after taking out the panel is moved to the next gob. Sent to the supply position.

Thus, glass supply → press (pressure molding) → cooling by an air former → cooling by a duct →
The steps of taking out the panel and supplying the next glass are carried out by sequentially moving the lower molds to the respective positions.

[0008]

In order to increase the productivity of the panel in the above-mentioned panel molding process, when the cycle time from the feeding of the gob to the lower mold to the removal of the panel from the lower mold is shortened, If the cooling capacity of the panel per unit time cannot be raised, the cooling capacity cannot keep up with the production speed.

When the panel was actually molded by shortening the cycle time, the inner surface of the panel (the surface corresponding to the upper mold) was insufficiently cooled. That is, it was found that the portion of the inner surface of the panel immediately below the duct was sufficiently cooled by the cooling air from the blower, but the portion outside thereof was insufficiently cooled.

Therefore, an attempt was made to eliminate the insufficient cooling by increasing the diameter of the duct so that the cooling air is spread over the entire inner surface of the panel, but the cooling air supply amount from the blower is constant. However, if the diameter of the duct is increased, the amount of air blown per unit area becomes insufficient, and while there is no problem as long as the amount of air blown can be increased within the blowing capacity of the blower, there is a limit.

Further, in order to solve the shortage of cold air, it is possible to replace the air blower with a fan having a large air blowing capacity. However, a blower having a large size and a large flow rate for supplying cooling air to panels at a plurality of cooling positions is generally used. Since it has been
Furthermore, it takes a great deal of money to switch to a blower with a large size and a large flow rate.

The present invention has been made in view of the above-mentioned drawbacks, and it is possible to reduce the cycle time without costing a large amount of money and eliminating the insufficient cooling of a glass molded body such as a panel at a minimum cost. An object of the present invention is to provide a method and an apparatus for cooling a glass molded body.

[0013]

According to the present invention, molten glass is supplied to a lower mold, and then the upper mold is lowered to perform pressure molding, and then the upper mold is raised to open the mold, followed by molding with the lower mold. In the method for manufacturing a glass molded body, which is designed to be taken out after cooling the body, when cooling the molded body in the lower mold, cooling from above the molded body is sent from a duct composed of inner and outer double tubes. Provided is a method for cooling a glass molded body, which is characterized in that it is carried out with cold air.

According to the above method, the glass molded body is cooled not only by the cool air sent from one of the pipes of the duct but also by the cool air sent from the other pipe of the duct. The effect, for example, the same cooling effect as that of cooling the glass molded body by using a blower having a large size and a large flow rate, is obtained, the entire glass molded body is sufficiently cooled, and the cycle time can be shortened.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a preferred embodiment,
Cold air from a separate blower is blown into each of the ducts.

Further, according to the present invention, there is provided a duct including inner and outer double pipes for sending cool air to the glass molded body, and separate blowers connected to the respective pipes of the double pipe. Provided is a cooling device for a molded glass article.

In a preferred embodiment, there is provided a cooling device for a glass molded body having a duct for cooling the glass molded body and a blower connected to the duct, the duct being connected to another blower outside the duct. It is characterized by having a double tube structure provided. That is, for example, a double pipe structure can be formed by newly adding a duct outside the existing duct to the existing single duct cooling device.

[0018]

[Examples] The following is an example of a glass molded body 1
A case where a 4-inch size CRT panel is molded by shortening the cycle time of the molding process by 10% as compared with the conventional case will be described.

As described above, the panel is molded by the steps of glass supply → press (pressure molding) → cooling by an air former → cooling by a duct → panel removal → next glass supply. It is done by being carried to a position. Although there are multiple cooling positions, the duct at one cooling position, which is being cooled by the duct, was changed to an inner / outer double pipe.

FIG. 1 is a basic constitutional view of the present invention showing a state in which the upper mold is opened after pressure molding and the inner surface of the panel is cooled.
The panel 1 is placed in the lower mold 2 and its inner surface is the upper inner 2
It is cooled by the cool air sent from the duct 5 composed of the heavy pipes 3 and 4. In this example, the inner diameter of the outer tube 3 is 2
The inner tube 4 had an inner diameter of 80 mm.

A first blower 6 is connected to the inner pipe 4. The flow rate of the cooling air by the first blower 6 is, for example, 1250 Nm ³ / hr, which is the same as the conventional one. A second blower 7 is connected to the outer pipe 3. The flow rate of the cooling air by the second blower 7 was 2000 Nm ³ / hr. The flow rate of the outer tube 3 is higher than that of the inner tube 4, but the second blower 7 of the outer tube 3 is used only for cooling the panel, so the blower itself is A smaller size than the first blower 6 is sufficient.

The conventional duct for cooling the panel 1 shown in FIG. 2 has an inner diameter of 100 mm and a flow rate of 1250 Nm ³ / h.
r.

Here, comparing the cooling state of the panel by the duct constituted by the inner and outer double tubes of this embodiment and the cooling state by the conventional duct, in this embodiment, the inner diameter of the inner pipe 4 is By making it smaller than the inner diameter of the duct, the flow velocity can be increased and the cooling capacity of the central portion of the panel 1 can be improved. The cooling air flowing through the outer pipe 3 is added as the cooling capacity, and the cooling is insufficient. The peripheral portion of the central portion of the panel 1, which tends to be apt, can be cooled intensively. As a result, even though the cycle time was shortened by 10%, it was possible to cool to the same panel temperature as before the reduction.

The cooling distribution state of the glass molded body can be adjusted to an optimum state depending on the inner and outer pipe diameters, the arrangement positions, and the air flow rate. Further, although the glass molded body is described as a cathode ray tube panel in the above embodiments, the present invention is not limited to this and can be generally applied to cooling in a glass molding process using an upper mold and a lower mold.

[0025]

As described above, in the present invention, the glass molded body is cooled by the cool air in the duct constituted by the inner and outer double tubes. Therefore, for example, a blower similar to the conventional one is connected to the inner duct, Cycle time can be shortened by simply connecting a small blower to the outer duct to compensate for cooling shortage due to shortened cycle time in the molding process, and productivity can be reduced by adding the minimum necessary and simple configuration. Can be improved.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram of essential parts showing an example of an apparatus for carrying out a method for cooling a glass molded body of the present invention.

FIG. 2 is a basic configuration diagram of a main part of an apparatus using a conventional glass molded body cooling method.

[Explanation of symbols]

 1: Panel glass molded body 2: Lower mold 3: Tube outside the duct of the double tube 4: Tube inside the duct of the double tube 5: Duct 6: First blower 7: Second blower

Claims (3)

[Claims] 1. A method of supplying molten glass to a lower mold, then lowering the upper mold for pressure molding, then raising the upper mold to open the mold, and subsequently cooling the molded body by the lower mold and then taking it out. In the method for producing a glass molded body according to the above, when cooling the molded body in the lower mold, the cooling from above the molded body is performed by the cool air sent from the duct configured by the inner and outer double tubes. A method for cooling a molded glass article. 2. The method for cooling a glass molded body according to claim 1, wherein cold air from a separate blower is blown into each tube of the duct. 3. A glass molded body, comprising: a duct composed of inner and outer double tubes for sending cool air to the glass molded body; and a separate blower connected to each of the double tubes. Cooling system.