TWI427042B - A glass forming apparatus, a glass forming method, and a glass molded article manufacturing apparatus - Google Patents

Description

Glass forming device, glass forming method and glass molded product manufacturing device

The present invention relates to a glass forming apparatus, a glass forming method, and a glass molded product manufacturing apparatus, and more particularly to a forming mold for molding a glass molded article.

For example, as a method of manufacturing an optical glass element such as a lens, there is a technique of manufacturing by precision pressing: heating a glass molded article having a shape close to a finished product called a preform, and softening the glass molded article, and using The mold of high precision surface is pressed and transferred on the mold surface.

The preform is produced by, for example, flowing the molten optical glass material down to the molding surface of the molding die that ejects the gas while maintaining the molten optical glass material in a state of being suspended on the molding surface. Cool it down. For example, Patent Document 1 discloses a manufacturing method in which a molten glass flow which flows out from a molten glass outflow port is received by a gas in a non-contact state in which a gas is discharged in a state in which a gas is ejected. Thus, a molten glass lump was obtained as a material for forming an optical element. The porous mold used in the above production method has a structure in which the remaining gas flow in the gas ejected from the receiving surface of the porous mold does not contribute to suspending the molten glass lump, and does not flow toward the molten glass outflow port. ejection. That is, it is a mold structure in which the outer cover is covered on the upper surface of the porous mold except the receiving surface so as not to be ejected in the direction in which the remaining gas flows toward the outflow port.

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2000-095531

However, in the porous mold of the glass forming apparatus disclosed in Patent Document 1, since the outer surface of the porous mold is covered by the outer cover, the porous mold may be separated from the outer cover. Further, there is a problem that only the outer surface of the upper surface extends due to use, and a gap is formed between the porous mold and the outer cover, so that the air current leaks.

Further, there is a problem that a molten glass lump is produced while ejecting a gas on one side. Therefore, when impurities are present in the ejected gas, impurities are also mixed in the produced preform to cover the optical path or cause light scattering. Therefore, it is not possible to satisfy the optical constant such as the transmittance as the glass for the optical element. However, in the above Patent Document 1, the aspect of purifying the discharged gas is not involved.

The present invention has been developed in view of the above problems, and provides a glass forming apparatus, a glass forming method, and a glass molded product manufacturing apparatus which have a molding die which is easy to process and which is not easily deteriorated even after long-term use.

In order to solve the above problems, the inventors have found that by ejecting gas only from the receiving surface of the forming mold, it is preferable to perform the plugging treatment on the side other than the receiving surface of the forming mold, so that the processing can be facilitated and The invention has been completed with long-term use. More specifically, the present invention provides apparatus and methods as described below.

(1) A glass forming apparatus having a molding die through which a gas can pass, and a molten glass is received on a receiving surface of the forming die for ejecting gas, and the forming die ejects gas only from a receiving surface.

The glass forming apparatus of the present invention ejects gas only from the receiving surface of the molten glass. Therefore, it is only used to suspend the molten glass, and since the remaining gas is not ejected, the efficiency is high. Further, since the molten glass of the downstream device is not cooled by the gas ejected from the surface other than the receiving surface, streaking can be effectively prevented. Further, since the preform can be produced while floating on the molding die, it is possible to produce a preform having a surface free from defects such as wrinkles on the surface of the glass.

(2) The glass forming apparatus according to (1), wherein the side surface of the forming mold other than the receiving surface is subjected to a plugging treatment.

(3) The glass forming apparatus according to (2), wherein the plugging treatment is selected from the group consisting of a process of clogging the pores by the liquid composition and curing the pores, and clogging the pores by plasma spray, and using CVD (Chemical) Vapor Deposition (Chemical Vapor Deposition) is a process of blocking the pores and treating the group of pores by plating.

According to the above aspect, by performing the plugging treatment on the surface other than the receiving surface of the forming mold, it is possible to eject the gas only from the receiving surface. Further, since the base material (the member before the plugging process is applied to the forming mold) is directly subjected to the plugging treatment, the base material and the outer lid are not separated by the use as in the case where the outer lid is placed on the base material. Secondly, there is no possibility that a gap is formed between the base material and the outer cover by extending the outer cover, thereby causing gas leakage, so that it can withstand long-term use. Further, for the plugging treatment, it is preferred to use the above treatment. By performing the above treatment, it is possible to block only the pores or to thin the film formed on the molding die, so that the molding die can be miniaturized. Further, since the plugging process is directly performed on the forming die, it is possible to rework only the receiving surface of the forming die.

(4) The glass forming apparatus according to any one of (1) to (3) wherein the forming die is formed of a porous material.

According to the above aspect, since the molding die is formed of a porous material, the molding die having the desired molding die shape can be sintered, whereby the molding die in which the receiving surface and the side surface are integrated can be manufactured. Therefore, it is not necessary to connect the receiving surface and the side surface, so that it is possible to manufacture a good preform in which gas does not leak from the joint portion. Further, by using a porous material, the step of opening the pores can be omitted, and the pores are formed on the receiving surface and allow gas to pass therethrough. Further, since the pores are uniformly formed on the entire receiving surface, the gas can be uniformly discharged from the entire receiving surface.

(5) The glass forming apparatus according to (4), which is contained within a range of from -50% to +50% of the pore diameter of the volume diameter of the pore diameter of the porous material. The pore volume is 80% or more than 80%.

According to the above aspect, since the diameter of the pores is substantially uniform, the floating preform is stabilized, and a preform having a uniform shape can be produced.

(6) The glass forming apparatus according to (4) or (5), wherein the volume diameter of the pore diameter of the porous material is in the range of 10 μm to 400 μm.

According to the above aspect, since the mode diameter of the pore diameter is from 10 μm to 400 μm, the floating preform is stable and can be produced without applying a load to the gas pressure feed. If the mode diameter of the pore diameter exceeds the above range, the suspended preform is unstable, which is not preferable. Further, when the mode diameter of the pore diameter is less than the above range, the gas necessary for the suspension cannot be ejected, and an excessive load is applied to the pressure feed of the gas, which is not preferable.

(7) The glass forming apparatus according to any one of (4) to (6) wherein the porous material has a porosity of 50% or less than 50%.

According to the above aspect, since the porosity of the porous material is 50% or less, it is easy to obtain the discharge amount of the gas necessary for suspending the molten glass dropped from the downstream device, and it is difficult to apply an excessive load to the pressure feed of the gas. Therefore, the preform can be manufactured efficiently.

(8) The glass forming apparatus according to any one of (1) to (7), wherein the air system is air or an inert gas.

According to the above aspect, since the air of the gas system or the inert gas does not react with the composition of the glass, the preform having the desired composition can be produced. Examples of the inert gas include nitrogen, argon, helium, and the like.

(9) The glass forming apparatus according to any one of (1) to (8), wherein a heating means is provided, and the heating means heats the gas as needed.

According to the above aspect, the gas can be heated as needed. Therefore, it is possible to prevent quenching caused by the gas ejected from the receiving surface of the self-forming mold, thereby preventing cracks and streaks from occurring in the preform. The heating means for heating the gas can be heated by a burner or a heater, and the gas ejected from the receiving surface can be heated by heating a forming die or a pipe through which the gas passes. Among the above methods, it is preferred to use a method which is simple and effective in heating the forming mold.

(10) The glass forming apparatus according to any one of (1) to (9), wherein the gas passing through the purifying mechanism is provided before the gas is supplied to the forming mold.

(11) The glass forming apparatus according to (10), wherein the purifying mechanism is a filter.

According to the above aspect, since the purifying mechanism is provided before the gas is supplied to the forming mold, the dust or the like in the supplied gas can be removed, and the preform in which the impurities are not mixed can be produced. For the purifying mechanism, it is preferable to use a filter. For the cleanliness of the gas after passing through the purifying mechanism, it is preferable that 100 particles of 0.3 μm or more per one liter of volume under atmospheric pressure are used. Below, more preferably 50 or less, and most preferably 10 or less.

(12) A glass molded product manufacturing apparatus comprising: a dissolving device having a melting tank for melting a raw material into molten glass; and a guiding passage connected to the melting tank to cause the molten glass to flow out from the melting tank; The glass forming apparatus has a molding die for molding the molten glass, and a conveying device for conveying the glass molded article formed by the molding die; and the glass forming device is The glass forming apparatus according to any one of (1) to (11).

According to the above aspect, the glass forming apparatus of the present invention can be used as a glass molded product producing apparatus having a dissolving device, a downflow device, and a conveying device, thereby improving productivity.

(13) A preform for an optical element, which is formed by the glass forming apparatus according to any one of (1) to (11) or the glass molded article manufacturing apparatus of (12).

According to the above aspect, the preform formed by the glass forming apparatus according to any one of (1) to (11) or the glass molded article manufacturing apparatus of (12) is free from cracks and streaks, and the impurities are mixed. It is suitable for use as an optical component.

(14) A glass forming method for forming molten glass into glass, comprising: a down-flow step of flowing down the molten glass; and a step of forming a molten glass block on which one side ejects gas only from a receiving surface of the forming die through which the gas can pass And the molten glass is formed by receiving the molten glass that has flowed down on the receiving surface of the forming mold, and a cooling step of cooling the molten glass to form the glass.

(15) The glass forming method according to (14), wherein the side surface of the forming die other than the receiving surface is subjected to a plugging treatment.

(16) The glass forming method according to (15), wherein the plugging treatment is selected from the group consisting of a process of clogging the pores by the liquid composition and curing the pores, a treatment of clogging the pores by plasma spray, and clogging by CVD. The treatment of the pores and the treatment of the group consisting of the treatment of the pores by the plating treatment.

(17) The glass forming method according to any one of (14) to (16) wherein, in the molten glass block forming step, the forming die is formed of a porous material.

(18) The glass forming method according to (17), which is contained within a range of from -50% to +50% of the pore diameter of the volume diameter of the pore diameter of the porous material. The pore volume is 80% or more than 80%.

(19) The glass forming method according to (17) or (18), wherein the volume diameter of the pore diameter of the porous material is in the range of 10 μm to 400 μm.

(20) The glass forming method according to any one of (17) to (19), wherein the porous material has a porosity of 50% or less than 50%.

(21) The glass forming method according to any one of (14) to (20), wherein in the molten glass lump forming step, the molten glass lump is formed in a state where the molten glass is not in contact with the receiving surface.

(22) The glass forming method according to any one of (14) to (21), wherein air or an inert gas is ejected as the gas.

(23) The glass forming method according to any one of (14) to (22), wherein the gas is heated as needed.

(24) The glass forming method according to any one of (14) to (23), comprising a purification step of purifying the gas.

(25) The glass forming method of (24), wherein the purifying step is a step of passing the gas through the filter.

(26) A preform for an optical element, which is formed by the glass forming method according to any one of (14) to (25).

The glass forming method of (14) to (25) is that the glass forming apparatus of the above (1) to (11) is developed as a glass forming method. According to the glass forming method described above, the same effects as those described in the above-described glass forming apparatus can be achieved.

(27) A glass forming apparatus comprising: a molding die through which a gas can pass, a molten glass is received on a receiving surface of the molding die for ejecting a gas, and the gas is supplied before being supplied to the forming die The purifying mechanism through which the above gas passes.

(28) The glass forming apparatus according to (27), wherein the purifying mechanism is a filter.

(29) A glass forming apparatus having a molding die through which a gas can pass, a molten glass is received on a receiving surface of the forming die for ejecting a gas, and a purifying mechanism is provided before the gas is supplied to the forming die, and the purifying is performed The mechanism treats the gas so that the particles having a particle diameter of 0.3 μm or more per 100 liters in an atmospheric pressure state are 100 or less.

According to the glass forming apparatus of (27) to (29), since the purifying mechanism is provided before the gas is supplied to the forming mold, the dust or the like in the supplied gas can be removed, and the preform in which the impurities are not mixed can be produced.

According to the glass forming apparatus and the glass forming method of the present invention, it is possible to produce a high-quality preform by ejecting gas only from the receiving surface of the forming mold, and it is highly efficient and has no streaks when the gas is pressurized. Further, since the plugging treatment is performed by directly processing the base material (the member before the plugging process is performed on the forming mold or the member before the outer lid is placed), the mating is not performed as in the base material, and the mother is used as it is. The material is separated from the outer cover. Secondly, no gap is formed between the base material and the outer cover due to the extension of the outer cover, thereby causing gas leakage, so that it can withstand long-term use.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings, but the present invention is not limited thereto. 1 is a front view showing a configuration of a glass molded product manufacturing apparatus 1 including a glass forming apparatus 10 according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a configuration of a glass forming apparatus 10 of the present invention, and FIG. 3 is a configuration of the present invention. A schematic cross-sectional view of a forming die 11 of a portion of the glass forming apparatus 10 of the invention.

[Glass molded product manufacturing device]

As shown in FIG. 1, the glass molded article manufacturing apparatus 1 includes a dissolution device 30 having a melting tank 31 and a guide passage 32. The glass molded product manufacturing apparatus 1 further includes a downflow device 33, a glass forming device 10, a first transfer device 40, and a transfer device 50.

In Fig. 1, the melting tank 31 melts a raw material such as fine particles or glass cullet to become molten glass. The guide passage 32 is connected to the melting tank 31, and flows out of the molten glass from the melting tank 31. The downflow device 33 causes the molten glass flowing out through the guide path 32 to flow down. Actually, the guide passage 32 and the downflow device 33 are metal pipes that flow down the molten glass, and the inclined portion of the metal pipe is used as the guide passage 32, and the substantially vertical portion of the metal pipe is the downflow device 33.

In Fig. 1, a glass forming apparatus 10 has a plurality of forming dies 11 for molding molten glass. The conveying device 50 conveys the glass molded article formed by the molding die 11. The first transfer device 40 transfers the glass molded product from the glass forming device 10 to the transfer device 50.

<Glass forming device>

Next, the glass forming apparatus 10 of the present invention will be described. As shown in Fig. 2, the glass forming apparatus 10 of the present invention includes a disk-shaped rotary table 12, and the center portion of the rotary table 12 is rotatably supported and rotatable clockwise or counterclockwise. The rotary table 12 has a plurality of molding dies 11 disposed at concentric positions on the peripheral edge portion of the rotary table 12, and a holder 17 that holds the molding die 11. In addition, a part of the forming die 11 and the holder 17 is omitted in FIG. Further, the glass forming apparatus 10 includes a rotating shaft 13 that penetrates the center portion of the turntable 12 and extends vertically upward and downward with respect to the disk surface of the turntable 12, and an air supply pipe 14 that passes through the rotating shaft from the upper portion of the rotating shaft 13 13 is internal and connected to the connecting pipe 15. The glass forming apparatus 10 has a connecting pipe 15 that extends from the center portion of the turntable 12 toward the holder 17. The gas supplied to the forming die 11 is supplied to the forming die 11 through the air supply pipe 14, the connecting pipe 15, and the holder 17.

Further, the glass forming apparatus 10 has a heating mechanism that can heat the gas supplied to the forming die 11 as needed. The heating mechanism is provided at the side of the forming mold 11, and the gas is heated by heating the forming mold 11. In the present embodiment, the forming die 11 is heated by the burner 16, but the invention is not limited thereto. For example, a method of heating the forming die 11 by a heater or directly heating the forming die 11 by energizing the forming die 11 can be used. By heating the gas, it is possible to prevent the molten glass from being quenched, thereby preventing cracks and streaks in the formed preform.

Further, as shown in FIG. 1, the glass forming apparatus 10 includes a filter 18 as a purifying mechanism for removing impurities of a gas supplied to the forming die 11. The gas is passed through the filter 18 and supplied, whereby the formed glass molded article can be a glass molded article in which less impurities are mixed. Further, in Fig. 1, the filter 18 is provided at the inlet of the glass forming apparatus 10. However, the filter 18 may be provided without particularly limiting the position and size of the filter 18. Further, when a compressor is used to supply the gas, it is preferred to use a filter of a particulate solid, a dust filter, and an oil mist filter as a purifying mechanism, and it is preferable to form the gas flow path in the above-described order. Set the above filters in the column. For the filter 18, it is preferable to arrange, for example, a mist splitter AM450, a micro mist splitter AMD450, and a super mist splitter AME450 manufactured by SMC Co., Ltd. in the above-described order.

(forming die) "First Embodiment"

Fig. 3 is a schematic cross-sectional view showing a molding die 11 constituting a part of the glass forming apparatus 10 of the present invention. The forming die 11 is disposed below the downflow device 33 and has a receiving surface 114 that receives the molten glass flowing down from the lower flow device 33. The molding die 11 has a box shape having a gas supply chamber 112 therein and is formed of a porous body 111, and the porous body 111 is formed of a porous material. The porous body 111 has heat resistance. Here, the porous body 111 is formed of a porous metal made of sintered stainless steel. Therefore, a plurality of fine holes are provided on the entire surface of the forming mold 11. In order to prevent leakage of gas from the plurality of fine pores, a plugging treatment is performed on the surface other than the receiving surface 114. In Fig. 1, as an example of the plug hole processing, a plating layer 113 is formed on the surface of the forming mold 11 other than the receiving surface 114 by plating treatment to block the excess fine pores. Thereby, a plurality of fine holes that connect the gas supply chamber 112 to the outside are formed only on the receiving surface 114.

In the porous body 111 in which the molding die 11 is formed, not only the porous surface but also the bottom surface and the bottom surface are formed of the porous material, and the porous body 111 is integrated. The porous body is formed by sintering stainless steel, the stainless steel is formed into a desired shape, and sintered, whereby it can be easily formed. Further, since the porous system is integrated, it is not necessary to connect the receiving surface and the side surface of the porous body, so that the gas supplied from the connecting portion to the gas supply chamber 112 is not discharged. For the porous material, in addition to the above stainless steel, porous carbon or the like can also be used.

Further, it is preferred that the porous material has a uniform pore diameter. The preform having a uniform shape can be produced by making the diameter of the pores substantially uniform to stabilize the suspended preform. Specifically, it is preferably a pore of -50% to +50% of the mode diameter from the volume basis of the pore diameter. The pore volume contained in the diameter range is 80% or more. By making the pore diameter within the above range, the pore diameter can be made substantially uniform, and the suspended preform can be stabilized, whereby a preform having a uniform shape can be produced. In order to obtain the above effects, it is more preferable that the pore volume contained in the range of -45% to +45% of the pore diameter of the volume basis is 80% or more, preferably. The pore volume included in the pore diameter of -40% to +40% of the mode diameter on the volume basis is 80% or more. Further, in the porous body of the embodiment of the present invention, the pore volume contained in the range of the pore diameter of from -34.7% to +34.8% of the mode diameter on the volume basis is 81.7. %.

The pore diameter of the porous material was measured using a mercury pore meter. For the pore volume, the amount of mercury intrusion is used. The Washburn formula was used to calculate the pore size based on the pressure applied when mercury was pressed. For the mode diameter, a value obtained based on the volume (volume) of the pores is used.

Further, it is preferable that the mode diameter of the pore diameter of the porous material is in the range of 10 μm or more and 400 μm or less. The upper limit of the mode diameter is preferably 400 μm or less, more preferably 60 μm or less, and most preferably 35 μm or less. By setting the upper limit of the mode diameter to the above range, the suspended preform posture is stabilized, and a good glass can be obtained. Further, it is preferable that the lower limit of the mode diameter is 10 μm or more, more preferably 12 μm or more, and most preferably 15 μm or more. By setting the lower limit of the mode diameter to the above range, it is easy to eject the gas necessary for the suspension, and it is difficult to apply an excessive load to the pressure feed of the gas.

Then, it is preferred that the porosity of the porous body is 50% or less. Further, it is preferred to set the upper limit to 40%, and preferably to 30%. Further, it is preferred that the lower limit is 10%, more preferably 12%, and most preferably 15%. By setting the porosity to the above range, it is easy to eject the gas necessary for the suspension, and it is difficult to apply an excessive load to the gas pressure.

Here, the porosity is expressed by the following formula.

Porosity (%) = (true density - bulk density) / true density × 100 For true density and bulk density, a value obtained by a mercury pore meter is used.

Further, a plugging process is performed on the surface other than the receiving surface of the forming mold 11. The plugging treatment is preferably selected from the group consisting of a treatment for blocking pores by a liquid composition and curing the pores, a treatment for blocking pores by plasma spray, a treatment for blocking pores by CVD, and a plating treatment. The treatment of the group consisting of processing to block the pores. In the above treatment, in particular, it is possible to perform processing by immersing only in a plating solution by a plating treatment, and it is easy to process. Further, the plating layer is made thinner, whereby the weight of the device can be reduced. For the above plating treatment, it is preferred to plate Cr.

Further, as shown in Fig. 3, on the outer diameter of the joint portion to which the holder 17 of the forming mold 11 is joined, there is a joint portion which can be screwed to the outer thread portion and joined to the forming mold 11 of the holder 17. On the inner diameter, there is an internal threaded portion that can be screwed. The forming die 11 and the holder 17 are held in a state in which the male screw portion and the female screw portion are screwed together. Thereby, the adhesion between the molding die 11 and the holder 17 can be improved, so that the preform in which the supplied gas does not leak from the joint portion between the forming die 11 and the holder 17 can be manufactured.

Further, the holder 17 is connected to the connection pipe 15, and the connection pipe 15 communicates with the gas supply chamber 112 provided inside the molding die 11. When a gas such as air or an inert gas is supplied to the gas supply chamber 112 via the connecting pipe 15 and the holder 17, the gas is discharged from the receiving surface 114 to the outside through a plurality of fine holes.

Then, the gas supplied to the molding die 11 is not particularly limited as long as it is a gas that does not react with the glass component, but it is preferred to use air or an inert gas. Examples of the inert gas include nitrogen, argon, helium, and the like.

"Second Embodiment"

Fig. 4 is a schematic cross-sectional view showing a molding die 11A of the second embodiment. Similarly to the molding die 11 of the first embodiment, the molding die 11A has a receiving surface 114A that receives the molten glass. Further, the molding die 11A has a box shape having a gas supply chamber 112A therein, and is formed of a porous body 111A, and the porous body 111A is formed of a porous material. The plating layer is not provided on the surface other than the receiving surface 114A of the molding die 11A, and is different from the molding die 11 of the first embodiment. As in the first embodiment, in the molding die 11A of the second embodiment, as shown in Fig. 1, the filter 18 as a purifying mechanism is provided at the inlet of the glass forming apparatus 10, so that the formed glass molded article can be mixed. A glass molded article with less impurities.

[Glass forming method]

Next, the glass forming method of the present invention using the above glass forming apparatus will be described with reference to Figs. 2, 3 and Figs. The glass forming method of the present invention forms the molten glass into glass, and includes a step of flowing down the molten glass, and a step of forming the molten glass block, one side of which only ejects gas from the receiving surface of the forming die through which the gas passes, while The molten surface of the molten mold is formed by receiving the molten glass that has flowed down on the receiving surface of the forming mold, and a cooling step of cooling the molten glass to form the glass.

The gas is supplied from the connecting pipe 15 to the gas supply chamber 112, and the gas is ejected from the surface of the receiving surface 114 of the forming die 11. In the above state, the molten glass flows down from the downflow device 33, and the molten glass is received on the receiving surface 114. The molten glass floats on the receiving surface 114 and is held. As shown in Fig. 5, the middle portion of the entrained portion becomes thinner and becomes thinner. Once the molten glass reaches a fixed weight, the intermediate tapered portion of the portion on the way of thinning is broken by the surface tension, so that a molten glass lump can be obtained.

After the molten glass lump falls on the receiving surface 114 of the forming die 11, the forming die 11 is immediately moved on the rotary table 12 as shown in FIG. While the above-described forming die 11 is being moved, the other empty forming die 11 is moved below the downflow device 33 to prepare for the flow of the next molten glass.

The molten glass block held on the receiving surface 114 is made to homogenize the molten glass by the gas ejected from the receiving surface 114, and the molten glass is cooled to a temperature lower than the softening point while moving on the rotary table 12. The glass molded article is molded. Since the molten glass block is brought into a floating state by the gas to be ejected, the molten glass lump is not brought into direct contact with the receiving surface 114 of the forming mold 11 to be quenched. Therefore, it is possible to efficiently form a glass molded article having an extremely high precision, and the molten glass of the glass molded article does not wrinkle or the like in contact with the receiving surface 114, and has no defects such as wrinkles on the surface. Further, it is also possible to effectively prevent the molten glass lump from being welded to the receiving surface 114.

While the molding die 11 is rotated one revolution on the rotary table 12, the formed glass molded article is conveyed to the next step by the first transfer device 40 such as a vacuum suction mechanism. Next, the empty forming die 11 is again moved below the downflow device 33 for the formation of the next glass molded article. By repeating the above steps, the glass molded article can be efficiently formed.

1. . . Glass molded product manufacturing device

10. . . Glass forming device

11,11A. . . Forming die

12. . . Rotary table

13. . . Rotary axis

14. . . Air supply tube

15. . . Connecting tube

16. . . burner

17. . . Holder

18. . . filter

30. . . Dissolution device

31. . . Melting tank

32. . . Guide road

33. . . Downflow device

40. . . First transfer device

50. . . Handling device

111,111A. . . Porous body

112, 112A. . . Gas supply room

113. . . Plating

114,114A. . . Receiving surface

Fig. 1 is a front elevational view showing the configuration of a glass molded article manufacturing apparatus including the glass forming apparatus of the present invention.

Fig. 2 is a perspective view showing the configuration of a glass forming apparatus of the present invention.

Fig. 3 is a schematic cross-sectional view showing a molding die of a first embodiment which constitutes a part of the glass forming apparatus of the present invention.

Figure 4 is a schematic cross-sectional view showing a molding die of a second embodiment.

Fig. 5 is a schematic cross-sectional view showing a state in which molten glass is discharged from a downstream device into a molding die of the first embodiment.

Fig. 6 is a schematic cross-sectional view showing a state in which the molding die of the first embodiment is moved on a rotary table.

11. . . Forming die

15. . . Connecting tube

17. . . Holder

111. . . Porous body

112. . . Gas supply room

113. . . Plating

114. . . Receiving surface

Claims (24)

A glass forming apparatus having a forming die through which a gas can pass, and a molten glass is received on a receiving surface of the forming die for ejecting a gas, and the forming die is directly plugged on a side surface other than the receiving surface. The hole is treated and only the gas is ejected from the receiving surface. A glass forming apparatus having a forming die through which a gas can pass, and a molten glass is received on a receiving surface of the forming die for ejecting a gas, and the forming die has a plug hole on a side surface other than the receiving surface. The treatment is performed, and only the gas is ejected from the receiving surface. The plugging treatment is selected from the steps of clogging the pores by the liquid composition and curing the pores, clogging the pores by plasma spray, and clogging the pores by CVD. The treatment and the treatment of the group consisting of the treatment of plugging the pores by electroplating. The glass forming apparatus of claim 1 or 2, wherein the forming die is formed of a porous material. A glass forming apparatus having a forming die formed of a porous material and allowing a gas to pass therethrough, and receiving a molten glass on a receiving surface of the forming die for ejecting a gas, the forming die being ejected only from the receiving surface The volume of the gas from the pore diameter of the porous material (volume) On the basis of the range of -50% to +50% of the pore diameter of the mode diameter, the pore volume contained therein is 80% or more. A glass forming apparatus having a forming die formed of a porous material and allowing a gas to pass therethrough, and receiving a molten glass on a receiving surface of the forming die for ejecting a gas, the forming die being ejected only from the receiving surface The gas has a mode diameter on a volume basis of the pore diameter of the porous material in a range of 10 μm or more and 400 μm or less. A glass forming apparatus having a forming die formed of a porous material and allowing a gas to pass therethrough, and receiving a molten glass on a receiving surface of the forming die for ejecting a gas, the forming die being ejected only from the receiving surface The gas has a porosity of 50% or less in the porous material. The glass forming apparatus of claim 1, wherein the gas system is air or an inert gas. A glass forming apparatus according to claim 1, wherein a heating means is provided, wherein said heating means heats said gas as needed. The glass forming apparatus of claim 1, wherein the gas passing through the purifying mechanism is provided before the gas is supplied to the forming die. The glass forming apparatus of claim 9, wherein the purifying mechanism is a filter. A glass molded article manufacturing apparatus characterized by comprising: a dissolving device comprising: a melting tank for melting a raw material into molten glass; and a guiding passage connected to the melting tank to cause the molten glass to flow out from the melting tank; and a downflow device for flowing the molten glass flowing out through the guiding passage; A glass forming apparatus comprising: a molding die for molding the molten glass; and a conveying device that conveys a glass molded article formed by the molding die; and the glass forming device is the glass molding device of claim 1. A preform for an optical element, which is formed by the glass forming apparatus of claim 1 or the glass molded article manufacturing apparatus of claim 11. A glass forming method, characterized in that it is a method for forming molten glass into glass, comprising: a downflow step of flowing down the molten glass; and a step of forming a molten glass block, one side of which is only performed on the side other than the receiving surface Directly plugging and only the above-mentioned receiving surface can allow gas to pass through the receiving surface of the forming die, and the molten glass is formed by receiving the molten glass on the receiving surface of the forming die, and cooling step; This cools the molten glass lump to shape the glass. A glass forming method, characterized in that it is a method for forming molten glass into glass, comprising: a downflow step of flowing down the molten glass; and a step of forming a molten glass block, the one side of which only allows gas to pass through The receiving surface of the forming die ejects gas, and the molten glass is formed on the receiving surface of the forming die to form the molten glass block, and a cooling step of cooling the molten glass block to form the glass, wherein the forming The mold is subjected to a plugging treatment on the side other than the receiving surface, and the plugging treatment is selected from the group consisting of a process of blocking the pores by the liquid composition and curing the pores, and a process of blocking the pores by plasma spray, and using CVD. The treatment of blocking the pores and the treatment of the pores by the plating treatment. The glass forming method of claim 13, wherein in the molten glass block forming step, the forming die is formed of a porous material. A glass forming method, characterized in that it is a method for forming molten glass into glass, comprising: a downflow step of flowing down the molten glass; and a step of forming a molten glass block, one side of which is only supported by a forming die through which a gas can pass a gas is sprayed on the receiving surface of the forming die to receive the molten glass that has flowed down to form the molten glass lump, and a cooling step of cooling the molten glass lump to form the glass, wherein the forming die is made of porous The material is formed in a volume reference (volume from the pore diameter of the porous material) On the basis of the range of -50% to +50% of the pore diameter of the mode diameter, the pore volume contained therein is 80% or more. A glass forming method, characterized in that it is a method for forming molten glass into glass, comprising: a downflow step of flowing down the molten glass; and a step of forming a molten glass block, one side of which is only supported by a forming die through which a gas can pass a gas is sprayed on the receiving surface of the forming die to receive the molten glass that has flowed down to form the molten glass lump, and a cooling step of cooling the molten glass lump to form the glass, wherein the forming die is made of porous In the material formation, the volume diameter of the pore diameter of the porous material is in the range of 10 μm or more and 400 μm or less. A glass forming method, characterized in that it is a method for forming molten glass into glass, comprising: a downflow step of flowing down the molten glass; and a step of forming a molten glass block, one side of which is only supported by a forming die through which a gas can pass a gas is sprayed on the receiving surface of the forming die to receive the molten glass that has flowed down to form the molten glass lump, and a cooling step of cooling the molten glass lump to form the glass, wherein the forming die is made of porous The material is formed, and the porosity of the porous material is 50% or less. The glass forming method of claim 13, wherein In the molten glass lump forming step, the molten glass lump is molded in a state where the molten glass is not in contact with the receiving surface. A glass forming method according to claim 13, wherein air or an inert gas is ejected as the above gas. The glass forming method of claim 13, wherein the gas is heated as needed. The glass forming method of claim 13 which comprises the step of purifying said gas. The glass forming method of claim 22, wherein the purifying step is a step of passing the gas through the filter. A preform for an optical element, which is formed by the glass forming method of claim 13.