JP3255864B2 - Press forming heating apparatus and press forming heating method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press forming and heating apparatus and a press forming and heating method, and more particularly to a press forming and heating apparatus having a plurality of forming dies and a molten mass supplied to the forming dies and heated to perform press forming. The present invention relates to a press molding heating method.

[0002]

2. Description of the Related Art Press molding heating is generally used for producing lenses, prisms, disks, diffraction gratings, or preforms thereof. For example, when molding an optical glass lens, a molten glass lump is dropped into a mold and pressed to perform molding. In this case, the mold portion of the molding die is heated at a constant temperature in order to make the temperature of the glass block easy to press-mold. The heating temperature varies depending on the type of glass and the size of the glass block. By controlling the heating temperature of the molding die in this way, deformation of the shape of the glass lens that occurs during press molding is prevented, and molding defects such as cracks and chips are prevented. For this reason, the heating control management of the molding die occupies a particularly important position as affecting the precision of glass molding.

FIG. 6 is a plan view of a conventional press forming and heating apparatus. In the conventional apparatus, a plurality of molds are heated by a heater to indirectly heat a glass lump. Four molds 201 to 204 are arranged on the turntable 200, and the molds have holes 201 a to 2 for dropping a glass lump, respectively.
04a is provided. And the molds 201 to 20
4 is surrounded by heat insulating materials 301 to 304. In the figure, the insulation is shown with diagonal lines.

A cartridge heater is embedded in each of the heat insulators 301 to 304. In the figure, the insulation 301
3 shows a state in which the cartridge heaters 401 to 404 are embedded. Although not shown, a heater lead wire is connected to the cartridge heaters 401 to 404, and a current is supplied.

Further, a position P5 is a position where the molten glass lump is dropped into the mold. The position P6 is a position where the glass block is pressed with the upper mold. The position P7 is a position where normal-temperature air is blown to cool. The position P8 is a position where the formed glass is taken out.

Next, the press forming operation of the press forming heating apparatus will be described. However, the molding die 201 will be described, and the operation of the press molding performed by the other molding dies is the same, so the description will be omitted. The current flowing through the heater lead wire causes the cartridge heater 401
404 generate heat, and the mold portion of the mold 201 is heated. Then, in the hole 201a of the molding die 201 at the position P5,
The molten glass mass is dropped. Thereafter, the turntable 200 rotates 90 degrees clockwise, and the mold 201 moves to the position P6. The glass block inserted into the hole 201a of the molding die 201 is pressed by the upper die of the molding die 201 at a position P6. Further, the turntable 200 rotates 90 degrees clockwise, and the mold 201 moves to the position P7. The press-formed glass is cooled with room temperature air at a position P7. Further, the turntable 200 rotates 90 degrees clockwise, and the mold 201 moves to the position P8. Then, the glass formed at the position P8 is taken out. Press molding is performed in such a flow.

[0007]

However, in the conventional apparatus described above, a plurality of cartridge heaters are attached to each mold. Therefore, if any one of the cartridge heaters fails due to deterioration, disconnection, or the like, the temperature of a plurality of molds cannot be controlled to the same temperature.

On the other hand, if the type of glass is changed, the mold must be replaced, but at the time of replacing the mold, a cartridge heater appropriate for the size of the mold must be selected. Since the press-forming heating device is often installed in a high-temperature adverse environment, it is very burdensome for the operator to perform the work of attaching and detaching the heater lead wire accompanying the replacement work.

[0009] Further, maintenance and repair inspection of the cartridge heater requires considerable cost. Furthermore, in the conventional apparatus, the variation in the heat generation temperature of each mold is large,
For example, there was a width of 50 degrees.

[0010] The present invention has been made in view of the above points, and an object of the present invention is to provide a press-forming heating apparatus that controls the temperatures of a plurality of molds to the same temperature. Another object of the present invention is to provide a press-forming heating device capable of rapidly changing a mold.

[0011] Still another object of the present invention is to provide a press-forming and heating apparatus for suppressing running costs. Another object of the present invention is to provide a press molding heating method for controlling the temperatures of a plurality of molds to the same temperature.

[0012]

According to the present invention, in order to solve the above-mentioned problems, in a press forming heating apparatus having a plurality of forming dies, the plurality of forming dies are arranged, and the plurality of forming dies are arranged.
For each shape, the position where the glass block is dropped, the glass block
The position to press, the position to cool the pressed glass
Can be moved to the position where the molded glass is taken out.
A mold placing stand that, of disposed around the plurality of molds
And a high-frequency coil for performing high-frequency induction heating for heating the mold at once.

Here, a plurality of molds are arranged on the mold arrangement table, and each mold is placed at a position where a glass lump is dropped.
Place, the position to press the glass block, the pressed glass
Move to the position to cool and take out the formed glass
Configure as possible. Each position on this multiple mold
And drop the molten glass lump, press-mold and cool
And take it out. Then, a high-frequency current is passed through the high-frequency coil to cause the alternating magnetic flux to penetrate the mold, thereby generating an eddy current to heat the mold portion of the mold. By such high-frequency induction heating, a plurality of molds are heated collectively.

Further, by supplying a glass gob that is molten in the mold, at press molding heating method <br/> press-molding the glass gob, is arranged a high-frequency coil around a plurality of said molds, with heated collectively the mold by high-frequency induction heating from the high-frequency coil, said plurality
Position of the glass mold into the mold,
Position to press the lump, cool the pressed glass
Position, the position where the formed glass is taken out, and
A press forming heating method is provided, which comprises performing press forming of a lath block .

Here, a high-frequency current is passed through the high-frequency coil to cause the alternating magnetic flux to penetrate the mold. Then, an eddy current is generated to heat the mold portion of the molding die. With such a high-frequency induction heating method, the mold portions of a plurality of molds are heated collectively. At each of these multiple molds,
Drop the molten glass lump, press-mold, cool,
Take out.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a press forming and heating apparatus of the present invention, and FIG. 2 is a side sectional view. In FIG.
Eight molding dies 11 to 18 are circumferentially arranged on a turntable 10 serving as a molding die placement table, and each of the molding dies is provided with a hole 11c to 18c for dropping a glass lump. The high-frequency coil 21 is arranged on the concentric circumference inside and outside the molding dies 11 to 18 arranged in a circle. Then, the high-frequency coil 21 is connected to the power supply unit 31.

The position P1 is a position where the molten glass lump is dropped into the mold. The position P2 is a position where the glass block is pressed by the upper mold. The position P3 is a position where the room temperature air is blown to cool. The position P4 is a position where the formed glass is taken out.

In FIG. 2, a mold 11 and a mold 12 are set on a turntable 10. High frequency coil 2
1 is arranged on a turntable so as to surround the outside and inside of the molds 11 and 12. Therefore, the high-frequency coil 21 is shown at a position as shown in the figure.

The configuration of the mold portion of the molding die 11 is composed of a trunk die 11a and a lower die 11b. The molten glass mass
It is dropped into a hole 11c formed by the body mold 11a and the lower mold 11b. Here, the configuration of the mold parts of the molding dies 12 to 18 is as follows.
The description is omitted because it is the same as the mold part of the molding die 11. As the material of the mold, austenitic stainless steel or ductile cast iron having high corrosion resistance and high strength is used. And the heat generation temperature of the mold is 700 from the latter half of 400 degrees.
Degree, and can be selected depending on the glass type.

Next, the press forming operation of the press forming and heating apparatus will be described with reference to FIG. High frequency coil 21
, A high-frequency current supplied from the power supply unit 31 flows. In this case, the molding dies 11 to 18 arranged in a circumferential shape
The high-frequency coil 21 disposed on the inner circumference of the high-frequency coil 21 and the high-frequency coil 21 disposed on the outer circumference of the high-frequency coil 21 flow in opposite directions. For example, if a clockwise high-frequency current flows through the high-frequency coil 21 disposed on the inner circumference, a counterclockwise high-frequency current flows through the high-frequency coil 21 disposed on the outer circumference. Become.
When such a high-frequency current flows, the alternating magnetic flux passes through the molds 11 to 18. Then, an eddy current is generated to heat the mold portions of the molds 11 to 18. By such high-frequency induction heating, the mold portions of the plurality of molds 11 to 18 are collectively heated.

Further, as shown in FIG.
Since 1 is arranged on the concentric circumference with respect to the molds 11 to 18, the molds 11 to 18 can be heated collectively at the same temperature.

Here, the electric specification given from the power supply unit 31 is such that the current is several to several hundred [A], for example, 20 to 60 [A].
[A]. The voltage is several to several hundred [V].
２２０220 [V]. The frequency is several tens [Hz]
It is several tens [kHz]. As described above, the value such as the current value provided from the power supply unit 31 can be arbitrarily set within the specification range.

The glass block is dropped into the high-frequency induction-heated mold and press-molded. In the apparatus shown in the figure, the turntable 10 rotates clockwise in units of 45 degrees to perform press molding. In other words, each time the turntable 10 rotates clockwise 45 degrees twice, each glass block dropped into the forming die is formed in the order of pressing, cooling, and removing. That is, the molten glass lump is dropped into the hole 11c of the molding die 11 at the position P1. Thereafter, the turntable 10 rotates 45 degrees clockwise. Therefore, at the position P1, the hole 1 of the next molding die 18
The lump of glass melted into 8c is dropped. Further, when the turntable 10 rotates 45 degrees clockwise, the molding die 1 is rotated.
1 moves to position P2. Then, the glass lump inserted into the hole 11c of the molding die 11 is pressed by the upper die of the molding die 11 at the position P2. Here, the process after the position P2 is the molding die 1
1 will be described, and the other press forming operations performed by the molds 12 to 18 will not be described because similar press forming is performed. After the turntable 10 has rotated clockwise 45 degrees twice from this position P2,
The mold 11 moves to the position P3. The press-formed glass is cooled with room temperature air at the position P3.

Further, after the turntable 10 makes two 45-degree clockwise rotations, the mold 11 is moved to the position P4.
Then, the glass formed at the position P4 is taken out.
Press molding is performed in such a flow.

As described above, the first embodiment of the present invention has a configuration in which heating is performed at a time by high-frequency induction heating. This makes it possible to control a plurality of molds at the same temperature.

In the first embodiment described above, the turntable is used as the mold placing table, and the glass block is subjected to the respective forming processes at the positions P1 to P4 by rotating the turntable. However, the present invention is not particularly limited to this.

For example, the molding die placement table may be used as a fixed table, and the process of dropping, pressing, cooling, and removing the glass block into the molding die, which is a series of molding processes, may be sequentially performed at the respective fixed positions.

Next, a second embodiment will be described with reference to the drawings. However, since this is an embodiment in which the shape and arrangement of the high-frequency coil are changed according to the arrangement of the molding die, only the configuration will be described.

FIG. 3 is a plan view of a press-forming heating apparatus according to a second embodiment, and FIG. 4 is a side sectional view. In FIG. 3, five molding dies 101 to 105 are arranged on a fixed base 100 which is a mold arranging table, and each of the molding dies is provided with holes 101 c to 105 c for dropping a glass lump. The high-frequency coil 121 is arranged outside the molds 101 to 105. The high-frequency coil 121 is connected to the power supply unit 131.

In FIG. 4, a molding die 101 is placed on a fixed base 100.
To 105 are arranged. The high-frequency coil 121 is arranged so as to surround the outside of the molds 101 to 105. Therefore, the high-frequency coil 121 is shown at a position as shown in the figure.

The configuration of the mold part of the molding die 101 is composed of a body die 101a and a lower die 101b. The melted glass lump is filled in a hole 10 formed by the body mold 101a and the lower mold 101b.
1c. Here, the configuration of the mold portions of the molding dies 102 to 105 is the same as the configuration of the mold portion of the molding die 101, and a description thereof will be omitted. The material of the mold is the same as that of the first embodiment described above, and the description is omitted.

As described above, two embodiments have been described with respect to the shape and arrangement of the high-frequency coil associated with the arrangement of the molding die. However, the configuration is not particularly limited as long as it is a high-frequency coil that performs high-frequency induction heating that can simultaneously heat a plurality of molds at the same temperature.

As described above, the press forming and heating apparatus of the present invention is provided with the high frequency coil for performing the high frequency induction heating for heating a plurality of molds at once. As a result, the same temperature characteristics can be obtained for all of the plurality of molds, and heating can be performed at the same temperature.

When molding from a small glass lens to a large glass lens, the mold must be replaced. Along with this, conventionally, it has been necessary to replace a heating object such as a cartridge heater. However, in the apparatus using the high-frequency coil of the present invention, the high-frequency coil can be installed at a certain distance from the molding die, so that it is not necessary to replace the high-frequency coil and the molding die can be quickly exchanged. .

Further, in the apparatus using the high-frequency coil of the present invention, since maintenance and repair / inspection such as the cartridge heater are not particularly required, the running cost can be suppressed.

Further, in the apparatus using the high-frequency coil of the present invention, since the molds are heated by high-frequency induction heating, it is possible to reduce the variation in the heat generation temperature of each mold. In the first embodiment of the present invention, the variation of the heat generation temperature could be kept within 10 degrees.

Next, the press molding heating method of the present invention will be described. FIG. 5 is a flowchart showing a processing procedure of the press molding heating method. [S1] A high-frequency coil is arranged around a plurality of molds. [S2] The mold is heated at once by high-frequency induction heating from the high-frequency coil and press-molded.

As described above, in the press forming and heating method of the present invention, a high-frequency coil is arranged around the forming die, and the forming die is heated collectively by high-frequency induction heating from the high-frequency coil to perform press forming. I decided to do it. Thereby, the temperature of the plurality of molds can be controlled to the same temperature, so that a high quality glass molded product can be stably produced.

In the above description, the lower molds of a plurality of molds are heated at a time by high-frequency induction heating. However, the upper molds of a plurality of molds can be heated at a time by high-frequency induction heating. .

[0040]

As described above, the press forming and heating apparatus according to the present invention is provided with a high frequency coil for performing high frequency induction heating for heating a plurality of molds at once. Thereby, the temperature of the plurality of molds can be controlled to the same temperature, so that a high quality glass molded product can be stably produced.

Further, since it is not necessary to replace the cartridge heater for each mold, it is possible to quickly exchange molds when changing the type of glass. Further, the high-frequency coil requires no special maintenance or repair and inspection unlike the cartridge heater, so that the running cost can be reduced. In particular, the mold placement table, the mold
The position to drop the lump, the position to press the glass lump,
Position to cool the glass, remove the formed glass
It is configured so that it can be moved to the ejection position, and the molding die is heated at once
High-frequency coils are installed, so the temperature at each position
And stable molding is possible.

Further, in the press forming and heating method according to the present invention, a high frequency coil is arranged around the forming die, and the forming die is collectively heated by high frequency induction heating from the high frequency coil to perform press forming. I made it. This allows
Since the temperatures of a plurality of molds can be controlled to the same temperature, high-quality glass molded products can be stably produced. In particular, high-frequency coils that heat the mold
Position, where the molds drop the glass block,
The position to press the glass block, cooling the pressed glass
To the position where the molded glass is taken out
Temperature fluctuations at each location
And stable molding becomes possible.

[Brief description of the drawings]

FIG. 1 is a plan view of a press-forming heating device according to the present invention.

FIG. 2 is a side sectional view of the press-forming heating device of FIG.

FIG. 3 is a plan view of a press-forming heating device according to a second embodiment.

FIG. 4 is a side sectional view of the press-forming heating device of FIG.

FIG. 5 is a flowchart showing a processing procedure of a press molding heating method according to the present invention.

FIG. 6 is a plan view of a press forming heating device that heats a forming die with a heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Turntable 11-18 Molding die 11c-18c Hole of molding die 21 High frequency coil 31 Power supply part P1 The position where a glass lump is dropped into a molding die P2 The position where a glass lump is pressed P3 The position where a formed glass is cooled P4 The molding To take out the glass

Claims (4)

(57) [Claims] 1. A press forming and heating apparatus provided with a plurality of forming dies , wherein the plurality of forming dies are arranged, and each of the plurality of forming dies is provided.
Where the glass block is dropped and the glass block is pressed.
Position, position to cool the pressed glass, molded
A mold placement table configured to be movable to a position where the glass is to be taken out, and a high-frequency coil that is arranged around the plurality of molds and performs high-frequency induction heating for heating the molds collectively. Press forming heating device characterized by the above-mentioned. 2. The apparatus according to claim 1, wherein the molding die is circumferentially arranged on the molding die placement table, and the high-frequency coil is arranged outside the circumference and inside the circumference. The press-forming heating device according to claim 1, wherein: Wherein supplying molten glass gob into the mold, before
In a press forming heating method of press forming the glass block , a high frequency coil is arranged around a plurality of the forming dies, and the high frequency induction heating from the high frequency coil collectively forms the forming dies. Heating and the plurality of molds
At the position where the glass block is dropped into the mold,
Position to cool the pressed glass,
A press-forming heating method, wherein the method moves to a position where a shaped glass is taken out and press- forms the glass block . 4. A method for disposing the plurality of molds on a mold placement table.
Place the mold and rotate the mold placement table to move the mold
4. The press forming according to claim 3, wherein the pressing is performed.
Heating method .