JP2010024115A - Method for producing glass gob, method for producing glass molded body and apparatus for producing glass gob and apparatus for producing glass molded body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for producing glass gob or a glass molded body having small surface roughness while suppressing the occurrence of the accumulation of a gas even when a lower mold having small unevenness on the surface is used. <P>SOLUTION: The flow of the gas flowing from the center of a receiving surface to the outer periphery is formed above the receiving surface of the lower mold. In the formation of the gas flow, a molten glass droplet is dropped from the dropping nozzle and received on the lower mold. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a glass gob manufacturing method, a glass molded body manufacturing method, a glass gob manufacturing apparatus, and a glass molded body manufacturing apparatus, and more specifically, a glass gob manufacturing method for receiving and manufacturing a dropped molten glass droplet with a lower mold. The present invention relates to a glass molded body manufacturing method, a glass gob manufacturing apparatus, and a glass molded body manufacturing apparatus.

  In recent years, glass optical elements are widely used as lenses for digital cameras, optical pickup lenses such as DVDs, camera lenses for mobile phones, coupling lenses for optical communication, and the like. As such a glass optical element, a glass molded body produced by pressure molding a glass material with a molding die is widely used.

  As one method for producing such a glass molded body, a glass preform having a predetermined mass and shape is prepared in advance, and the glass preform is heated and molded together with a molding die (hereinafter referred to as “reheat”). Also known as “pressing method”). Conventionally, glass preforms used in such a reheat press method have been manufactured by machining such as grinding and polishing. However, there is a problem that production of glass preforms by machining requires a great deal of labor and time. It was. For this reason, studies are being made on a method of receiving a molten glass droplet dropped from a dropping nozzle or the like with a lower mold to produce a glass gob (glass lump) and directly using it as a glass preform (gob preform).

  On the other hand, as another method for producing a glass molded body, a dropped glass melt is received by a lower mold, and the received molten glass droplet is pressure-formed by a lower mold and an upper mold to obtain a glass molded body (hereinafter referred to as a glass molded body). , Also referred to as “droplet forming method”). This method is attracting attention because it is possible to produce a glass molded body directly from molten glass droplets without the need to repeat heating and cooling of a molding die or the like, and the time required for one molding can be extremely shortened. .

  However, when a glass gob is manufactured or a glass molded body is manufactured by a droplet forming method, when the dropped molten glass droplet is received by the lower mold, the lower surface of the manufactured glass gob or glass molded body (contact surface with the lower mold) In addition, there is a problem that a gas reservoir (for example, an air reservoir) remains. This problem will be described with reference to FIG. FIG. 9 is a schematic diagram showing a state of the molten glass droplet 35 received by the lower mold 11 by a conventional method. FIG. 9A shows a state at the moment when the molten glass droplet 35 collides with the lower mold 11, and FIG. 9B shows a state after the molten glass droplet 35 is deformed by the surface tension thereafter. Yes.

  As shown in FIG. 9A, the molten glass droplet 35 at the moment of collision with the lower mold 11 is stretched flat by the impact of the collision. At this time, in the molten glass droplet 35, a minute concave portion 31 having a diameter of about several tens of μm to several hundreds of μm is generated near the center of the lower surface (contact surface with the lower mold 11). Although the mechanism by which such a recess 31 is generated is not necessarily clear, according to an analysis using a simulation or the like, when the molten glass droplet 35 collides with the lower mold 11, the glass in the portion that first collides with the lower mold 11. It is thought that this is caused by a recoil that bounces upward. The molten glass droplet 35 is then deformed into a round shape by the action of surface tension, as shown in FIG. 9B. At this time, since the lower surface of the molten glass droplet 35 and the surface of the lower mold 11 are in close contact with each other, there is no escape route for the gas accumulated in the recess 31, so that the recess 31 remains as a gas pool without disappearing. .

In order to cope with this problem, a method has been proposed in which the surface of the lower mold is roughened to secure a gas flow path that has entered the concave portion of the molten glass droplet, thereby preventing gas accumulation from remaining. (For example, refer to Patent Document 1). Further, a lower mold that prevents gas accumulation and facilitates regeneration by forming a coating layer including a dissolved layer on a roughened base surface has been proposed (for example, Patent Document 2). reference).
Japanese Patent Laid-Open No. 3-137031 JP 2005-272187 A

  In order to prevent gas accumulation by a method of roughening the surface of the lower mold as in the methods described in Patent Documents 1 and 2, a sufficiently high unevenness is formed on the surface of the lower mold. I have to leave. For this reason, the finally obtained glass gob and the lower surface of the glass molded body have a problem that the surface roughness becomes large due to the transfer of irregularities on the surface of the lower mold.

  In particular, when the produced glass molded body is used as an optical element such as a photographing optical system, the occurrence of surface fogging and flare due to such surface roughness tends to be a problem, and a solution has been desired. . Furthermore, even when the obtained glass gob or glass molded body is used as a glass preform for reheat press, in order to eliminate such a large surface roughness, a longer time is required for the production. It was a factor of cost increase.

  The present invention has been made in view of the technical problems as described above, and the object of the present invention is to suppress the occurrence of gas accumulation even when a lower mold having a small surface roughness is used. It is providing the manufacturing method and manufacturing apparatus which can manufacture a small glass gob and a glass molded object.

  In order to solve the above problems, the present invention has the following features.

1. In the manufacturing method of the glass gob which receives and cools the dropped molten glass droplet on the receiving surface of the lower mold,
Forming a gas flow from the center of the receiving surface toward the outer periphery above the receiving surface,
A method for producing a glass gob, wherein the molten glass droplet is received in a state where the gas flow is formed.

  2. 2. The glass gob manufacturing method according to claim 1, wherein the gas flow is formed by sucking a gas above the receiving surface from a suction port of a suction member disposed around the receiving surface. .

3. In the method for producing a glass molded body, which receives the dropped molten glass droplet on the receiving surface of the lower mold and press-molds with the lower mold and the upper mold,
Forming a gas flow from the center of the receiving surface toward the outer periphery above the receiving surface,
The method for producing a glass molded body, wherein the molten glass droplet is received in a state where the gas flow is formed.

  4). 4. The glass molded body according to 3 above, wherein the gas flow is formed by sucking a gas above the receiving surface from a suction port of a suction member disposed around the receiving surface. Production method.

5). In a glass gob manufacturing apparatus comprising a lower mold having a receiving surface for receiving a dropped molten glass drop,
An apparatus for producing a glass gob comprising a suction device for forming a gas flow from the center of the receiving surface toward the outer periphery.

6). In a glass molded body manufacturing apparatus comprising: a lower mold having a receiving surface for receiving a dropped molten glass droplet; and an upper mold for pressing the received molten glass droplet together with the lower mold.
An apparatus for producing a glass molded body, comprising a suction device for forming a gas flow from the center of the receiving surface toward the outer periphery.

  In the present invention, since a molten glass droplet is received in a state where a gas flow from the center of the receiving surface toward the outer periphery is formed above the receiving surface of the lower mold, it is formed at the time of collision with the lower mold. The surrounding gas can be prevented from being taken into the concave portion. Therefore, even when a lower mold having a small surface irregularity is used, the occurrence of gas accumulation can be suppressed, and a glass gob or a glass molded body having a small surface roughness can be produced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.

(Glass gob manufacturing method and manufacturing apparatus)
First, the manufacturing method and manufacturing apparatus of the glass gob which are the 1st Embodiment of this invention are demonstrated, referring FIGS. FIG. 1 is a flowchart of a glass gob manufacturing method in the present embodiment. 2 and 3 are views (sectional views) showing the glass gob manufacturing apparatus 10 according to this embodiment. FIG. 2 shows the state in the step of dropping molten glass droplets from the dropping nozzle (step S103), and FIG. 3 shows the state in the step of receiving molten glass droplets in the lower mold (step S104). FIG. 4 is a diagram (perspective view) illustrating an example of the suction member 41 used in the present embodiment, and FIG. 5 is a diagram (cross-sectional view) illustrating another example of the suction device 40.

  The glass gob manufacturing apparatus 10 shown in FIGS. 2 and 3 includes a lower mold 11 having a receiving surface 12 for receiving a molten glass droplet 35 dropped from a dropping nozzle 32, and a gas flow from the center of the receiving surface 12 toward the outer periphery. And a suction device 40 for forming 44.

  The suction device 40 of the present embodiment includes a suction member 41 having a suction port 43 and a suction pump 42 connected to the suction member 41. By sucking the gas above the receiving surface 12 from the suction port 43 by the suction pump 42, a gas flow 44 from the center of the receiving surface 12 toward the outer periphery is formed above the receiving surface 12.

  The suction device 40 is not particularly limited as long as it can form a gas flow 44 from the center of the receiving surface 12 to the outer periphery above the receiving surface 12. For example, as shown in FIGS. 2 and 3, the suction member 41 having the suction port 43 is arranged around the receiving surface 12, and the gas above the receiving surface 12 is sucked so that the outer periphery from the center of the receiving surface 12 is obtained. The gas flow 44 toward the bottom can be efficiently formed.

  The shape and size of the suction member 41 and the suction port 43 are not particularly limited. Specifically, as shown in FIG. 4A, a plurality of suction ports 43 may be provided on the inner peripheral surface of the doughnut-shaped suction member 41, or as shown in FIG. A slit-like suction port 43 may be provided on the inner peripheral surface of the suction member 41. Further, as shown in FIG. 4C, a plurality of divided suction members 41 may be arranged at a predetermined interval.

  Further, as shown in FIG. 5, the lower die 11 may have the function of the suction member 41, and the suction port 43 may be directly formed in the lower die 11 to suck the gas above the receiving surface 12. Furthermore, a hood 45 for regulating the gas flow is provided so that the gas flow 44 from the center of the receiving surface 12 toward the outer periphery is efficiently formed by sucking the gas from the suction port 43. It is also preferable.

  The lower mold | type 11 is comprised so that it can heat to predetermined temperature with the heating means which is not shown in figure. As the heating means, known heating means can be appropriately selected and used. For example, a cartridge heater that is used by being embedded in the lower mold 11, a sheet heater that is used while being in contact with the outside of the lower mold 11, an infrared heating device, a high-frequency induction heating device, or the like can be used.

  There is no restriction | limiting in particular in the shape of the receiving surface 12 of the lower mold | type 11, What is necessary is just to select suitably according to the shape of the glass gob to manufacture. For example, a plane as shown in FIGS. 2 and 3 may be used, or a surface precisely processed into a spherical surface or an aspherical surface may be used. It may be convex or concave.

  The material of the lower mold 11 can be appropriately selected from known materials as a molding mold material. Examples of materials that can be preferably used include, for example, various heat-resistant alloys (such as stainless steel), super hard materials mainly composed of tungsten carbide, various ceramics (such as silicon carbide, silicon nitride, and aluminum nitride), and composite materials containing carbon. Is mentioned.

  It is also preferable to provide a coating layer on the surface for improving the durability of the lower mold 11 and preventing fusion with the molten glass droplet 35. There are no particular restrictions on the material of the coating layer. For example, various metals (chromium, aluminum, titanium, etc.), nitrides (chromium nitride, aluminum nitride, titanium nitride, boron nitride, etc.), oxides (chromium oxide, aluminum oxide, etc.) , Titanium oxide, etc.) can be used. Among these, it is particularly preferable to provide a coating layer containing at least one element of chromium, aluminum, and titanium. A film containing these elements is characterized in that the surface is oxidized by heating in the atmosphere and a stable oxide layer is formed. Chromium, aluminum, and titanium oxides all have low standard generation free energy (standard generation Gibbs energy) and are very stable, so they do not react easily even when they come into contact with hot molten glass droplets. Has great advantages.

  Next, the steps of the glass gob manufacturing method of the present embodiment will be described in order according to the flowchart shown in FIG.

  First, the lower mold 11 is heated in advance to a predetermined temperature (step S101). If the temperature of the lower mold 11 is too low, large wrinkles are likely to occur on the lower surface of the glass gob (contact surface with the lower mold 11), and cracks and cracks may occur due to rapid cooling. On the other hand, if the temperature is set higher than necessary, fusion between the glass and the lower mold 11 is likely to occur, and the life of the lower mold 11 may be shortened. Actually, the appropriate temperature varies depending on various conditions such as the type, shape and size of the glass, the material and size of the lower mold 11, and it is preferable to obtain the appropriate temperature experimentally. Usually, when the glass transition temperature of the glass to be used is Tg, it is preferably set to a temperature of about Tg-100 ° C. to Tg + 100 ° C.

  Next, the suction pump 42 is driven, and the gas above the receiving surface 12 is sucked from the suction port 43 of the suction member 41 (step S102). Thereby, a gas flow 44 from the center of the receiving surface 12 toward the outer periphery is formed above the receiving surface 12 of the lower mold 11. What is necessary is just to set the flow volume of the gas flow 44 suitably according to various conditions, such as the surface roughness of the receiving surface 12, and the viscosity and mass of a molten glass droplet. For example, when the surface roughness of the receiving surface 12 is large, a sufficient effect can be obtained even with a relatively small flow rate. On the other hand, when the surface roughness of the receiving surface 12 is small, a relatively large flow rate is required. In addition, in this process, there is no restriction | limiting in the kind of gas which exists in the atmosphere around the lower mold | type 11. For example, air, inert gas (nitrogen, argon, helium, etc.), hydrocarbon gas, etc. are mentioned. From the viewpoint of simplification of the apparatus, it is preferable to carry out in air. In that case, the gas flow 44 formed in this step means a flow of air. From the viewpoint of preventing deterioration of the lower mold 11 due to oxidation, a method of reducing the oxygen concentration in the atmosphere around the lower mold 11 by introducing an inert gas is also effective. In that case, the gas flow 44 means a gas flow containing an inert gas.

  Note that the order of starting the step of heating the lower mold (S101) and the step of sucking the gas above the receiving surface 12 (S102) is not limited thereto, and the step S101 is started after the step S102 is started. You may start and you may start process S101 and process S102 simultaneously.

  Next, the molten glass droplet 35 is dropped from the dropping nozzle 32 (step S103). The dropping of the molten glass droplet 35 is performed by heating the dropping nozzle 32 connected to the melting tank 34 storing the molten glass 33 to a predetermined temperature. When the dropping nozzle 32 is heated to a predetermined temperature, the molten glass 33 stored in the melting tank 34 is supplied to the front end portion of the dropping nozzle 32 by its own weight and is accumulated in a droplet shape by the surface tension. When the molten glass collected at the tip of the dropping nozzle 32 reaches a certain mass, it is naturally separated from the dropping nozzle 32 by gravity and becomes a molten glass droplet 35 and falls downward.

  The mass of the molten glass droplet 35 dropped from the dropping nozzle 32 can be adjusted by the outer diameter of the tip of the dropping nozzle 32 and the like, and depending on the type of glass, the molten glass droplet of about 0.1 g to 2 g is dropped. be able to. Moreover, the molten glass droplet 35 dropped from the dropping nozzle 32 is once collided with a member having a through-hole, and a part of the collided molten glass droplet is allowed to pass through the through-hole to obtain a miniaturized molten glass droplet. It may be received by the lower mold 11. By using such a method, it is possible to obtain a minute molten glass droplet of, for example, 0.001 g. Therefore, a smaller amount of glass than the case of receiving the molten glass droplet 35 dripped from the dripping nozzle 32 as it is with the lower mold 11. The molded body can be manufactured. The interval at which the molten glass droplet 35 is dropped from the dropping nozzle 32 can be finely adjusted by the inner diameter, length, heating temperature, etc. of the dropping nozzle 32.

  There is no restriction | limiting in particular in the kind of glass which can be used, A well-known glass can be selected and used according to a use. Examples thereof include optical glasses such as borosilicate glass, silicate glass, phosphate glass, and lanthanum glass.

  Next, the molten glass droplet 35 is received by the lower mold 11 (step S104). In the present embodiment, the molten glass droplet 35 collides with the receiving surface 12 of the lower mold 11 in the state where the gas flow 44 from the center of the receiving surface 12 toward the outer periphery is formed by the step S102. At this time, it is possible to suppress the surrounding gas from being taken into the recess formed in the molten glass droplet 35. Therefore, even when a lower mold having a small surface irregularity is used, generation of gas accumulation can be suppressed, and a glass gob having a small surface roughness can be manufactured.

  Next, the received molten glass droplet 35 is cooled and solidified by being left on the lower mold 11 for a predetermined time (step S105). The gas flow 44 formed in step S102 needs to be continued until the molten glass droplet 35 is received by the lower mold 11 in step S104, but is not necessary thereafter. Therefore, the suction pump 42 may be stopped in step S105, or the process may proceed to the subsequent steps while the suction pump 42 is operated. Thereafter, the glass gob 36 obtained by solidification is recovered (step S106), and the production of the glass gob 36 is completed. Further, when manufacturing the glass gob 36 subsequently, the steps after step S102 may be repeated.

  In addition, the glass gob 36 manufactured by this embodiment can be used as a glass preform etc. used for manufacture of various precision optical elements by a reheat press method.

(Glass compact manufacturing method and manufacturing apparatus)
Next, the manufacturing method and manufacturing apparatus of the glass molded body of this invention are demonstrated, referring FIGS. 6-8. FIG. 6 is a flowchart of a method for manufacturing a glass molded body in the present embodiment. 7 and 8 are views (sectional views) showing the glass molded body manufacturing apparatus 20 according to this embodiment. FIG. 7 shows the state in the step of receiving molten glass droplets with the lower mold (step S205), and FIG. 8 shows the state in the step of press molding molten glass droplets (step S207).

  The glass molded body manufacturing apparatus 20 shown in FIGS. 7 and 8 is used for pressure forming the molten glass droplet 35 together with the lower mold 11 in addition to the configuration of the glass gob manufacturing apparatus 10 shown in FIGS. An upper mold 21 is provided. Similar to the lower mold 11, the upper mold 21 is configured to be heated to a predetermined temperature by a heating unit (not shown). It is preferable that the temperature of the lower mold 11 and the upper mold 21 can be controlled independently. The material of the upper mold 21 can be appropriately selected from the same materials as the lower mold 11. The material of the lower mold 11 and the upper mold 21 may be the same or different.

  The lower mold 11 has a position (dropping position P1) for receiving the molten glass droplet 35 by a driving means (not shown) and a position (pressure position P2) for performing pressure molding opposite to the upper mold 21. It is comprised so that a movement along the guide 22 is possible. Further, the upper die 21 is configured to be movable in a direction in which the molten glass droplet 35 is pressurized (vertical direction in the drawing) by a driving means (not shown).

  Hereinafter, each process will be described in order according to the flowchart shown in FIG. In addition, detailed description is abbreviate | omitted about the process similar to the manufacturing method of the above-mentioned glass gob.

  First, the lower mold 11 and the upper mold 21 are heated to a predetermined temperature (step S201). What is necessary is just to select suitably the temperature which can form a favorable transfer surface on a glass molded object by pressure molding with predetermined temperature. The heating temperature of the lower mold 11 and the upper mold 21 may be the same or different.

  Next, the lower mold 11 is moved to the dropping position P1 (step S202), and the suction pump 42 is driven to suck the gas above the receiving surface 12 from the suction port 43 of the suction member 41 (step S203). Thereby, a gas flow 44 from the center of the receiving surface 12 toward the outer periphery is formed above the receiving surface 12 of the lower mold 11. The details of step S203 are the same as step S102 in the above-described glass gob manufacturing method.

  Next, the molten glass droplet 35 is dropped from the dropping nozzle 32 (step S204), and the molten glass droplet 35 is received by the lower mold 11 (step S205). In the present embodiment, the molten glass droplet 35 collides with the receiving surface 12 of the lower mold 11 in the state where the gas flow 44 from the center of the receiving surface 12 toward the outer periphery is formed by the step S203. At this time, it is possible to suppress the surrounding gas from being taken into the recess formed in the molten glass droplet 35. Therefore, even when a lower mold having a small surface irregularity is used, the occurrence of gas accumulation can be suppressed, and the glass molded body 37 having a small surface roughness can be manufactured.

  Next, the lower mold 11 is moved to the pressure position P2 (step S206), the upper mold 21 is moved downward, and the molten glass droplet 35 is pressure-molded by the lower mold 11 and the upper mold 21 (process S207). ). The molten glass droplet 35 received by the lower mold 11 is cooled by heat radiation from the contact surface with the lower mold 11 and the upper mold 21 while being pressed and solidified to become a glass molded body 37. When the glass molded body 37 is cooled to a predetermined temperature, the upper mold 21 is moved upward to release the pressure. Depending on the type of glass, the size and shape of the glass molded body 37, the required accuracy, etc., it is usually preferable to release the pressure after cooling to a temperature near the Tg of the glass. The gas flow 44 formed in step S203 needs to be continued until the molten glass droplet 35 is received by the lower mold 11 in step S205, but is not necessary thereafter. Therefore, the suction pump 42 may be stopped after the process S205 is completed, or the process may proceed to the subsequent process while the suction pump 42 is operated.

  The load applied at the time of pressure molding may always be constant, or may be changed with time. What is necessary is just to set suitably the magnitude | size of the load to load according to the size etc. of the glass forming body 37 to manufacture. The driving means for moving the upper die 21 up and down is not particularly limited, and known driving means such as an air cylinder, a hydraulic cylinder, and an electric cylinder using a servo motor can be appropriately selected and used.

  Next, the upper mold | type 21 is evacuated and the glass molded object 37 is collect | recovered (process S208), and manufacture of the glass molded object 37 is completed. Thereafter, when the glass molded body 37 is subsequently manufactured, the lower mold 11 is moved again to the dropping position P1 (step S202), and steps S202 to S208 are repeated.

  In addition, the manufacturing method of the glass forming body of this invention may include another process other than having demonstrated here. For example, a step of inspecting the shape of the glass molded body before collecting the glass molded body, a step of cleaning the lower mold 11 and the upper mold 21 after collecting the glass molded body, and the like may be provided.

  The glass molded body manufactured by the manufacturing method of this embodiment can be used as an optical element such as an imaging lens such as a digital camera, an optical pickup lens such as a DVD, or a coupling lens for optical communication. Moreover, it can also be used as a glass preform used for manufacturing various optical elements by the reheat press method.

  Hereinafter, although the Example performed in order to confirm the effect of this invention is described, this invention is not limited to these.

(Example)
A glass molded body 37 was produced according to the flowchart of FIG. 6 using the glass molded body manufacturing apparatus 20 shown in FIGS. The materials of the lower mold 11 and the upper mold 21 were both super hard materials mainly composed of tungsten carbide.

  The shape of the receiving surface 12 of the lower mold 11 was a flat surface, and five types of lower molds having different arithmetic average roughness (Ra) were prepared by changing the polishing conditions. The arithmetic average roughness (Ra) is 0.005 μm (lower mold a), 0.01 μm (lower mold b), 0.02 μm (lower mold c), 0.1 μm (lower mold d), and 0. It was 3 μm (lower mold e). The arithmetic average roughness (Ra) is a roughness parameter defined in JIS B 0601: 2001, and was measured by AFM (D3100 manufactured by Digital Instruments).

  As the suction member 41, a donut-shaped member shown in FIG. On the inner peripheral surface of the suction member 41, six suction ports 43 are provided at equal intervals (60 ° intervals). As the glass material, phosphoric acid glass having a Tg of 530 ° C. was used. The outer diameter of the tip of the dropping nozzle 32 was 6 mm.

  The glass molded body was produced in air. In a state where air is sucked from the suction port 43 and an air flow from the center of the receiving surface 12 toward the outer periphery is formed, the tip of the dropping nozzle 32 is heated to 1050 ° C. Was dripped. After the dropped molten glass droplet 35 was received by the lower mold 11, it was pressure-formed by the lower mold 11 and the upper mold 21 to obtain a glass molded body 37. The heating temperature of the lower mold 11 was 500 ° C., the heating temperature of the upper mold 21 was 460 ° C., the load during pressing was 1200 N, and the pressing time was 15 seconds. Under the same conditions, a glass molded body 37 was produced using the above five types of lower molds, and the presence or absence of air accumulation was evaluated. Evaluation was performed with a 50 × optical microscope. As a result of the evaluation, no air pockets were observed in the produced glass molded body 37 in any of the five types of lower molds.

(Comparative example)
Unlike the example, air was not sucked from the suction port 43, and a glass molded body 37 was produced and evaluated by receiving the molten glass droplet 35 in a state where no air flow was formed on the receiving surface 12. It was. As a result of evaluation, no air accumulation was observed in the glass molded body produced by the lower molds d and e having a large arithmetic average roughness (Ra) on the surface, but the lower mold having a smaller arithmetic average roughness (Ra) than that. There was an air pocket in the glass molded bodies produced in ac.

It is a flowchart which shows an example of the manufacturing method of a glass gob. It is sectional drawing (state in process S103) which shows an example of the manufacturing apparatus 10 of a glass gob. It is sectional drawing (state in process S104) which shows an example of the manufacturing apparatus 10 of a glass gob. 4 is a perspective view showing an example of a suction member 41. FIG. It is sectional drawing which shows another example of the suction device. It is a flowchart which shows an example of the manufacturing method of a glass forming body. It is sectional drawing (state in process S205) which shows an example of the manufacturing apparatus 20 of a glass molded object. It is sectional drawing (state in process S207) which shows an example of the manufacturing apparatus 20 of a glass molded object. It is a schematic diagram which shows the state of the molten glass droplet received with the lower mold | type by the conventional method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Glass gob manufacturing apparatus 11 Lower mold 12 Receiving surface 20 Glass molded body manufacturing apparatus 21 Upper mold 22 Guide 32 Dripping nozzle 31 Recess (Gas accumulation)
33 Molten Glass 34 Melting Tank 35 Molten Glass Drops 36 Glass Gob 40 Suction Device 41 Suction Member 42 Suction Pump 43 Suction Port 44 Gas Flow 45 Hood P1 Dropping Position P2 Pressure Position

Claims (6)

In the manufacturing method of the glass gob which receives and cools the dropped molten glass droplet on the receiving surface of the lower mold,
Forming a gas flow from the center of the receiving surface toward the outer periphery above the receiving surface,
A method for producing a glass gob, wherein the molten glass droplet is received in a state where the gas flow is formed.   2. The glass gob manufacturing method according to claim 1, wherein the gas flow is formed by sucking a gas above the receiving surface from a suction port of a suction member disposed around the receiving surface. Method. In the method for producing a glass molded body, which receives the dropped molten glass droplet on the receiving surface of the lower mold and press-molds with the lower mold and the upper mold,
Forming a gas flow from the center of the receiving surface toward the outer periphery above the receiving surface,
The method for producing a glass molded body, wherein the molten glass droplet is received in a state where the gas flow is formed.   4. The glass molded body according to claim 3, wherein the gas flow is formed by sucking a gas above the receiving surface from a suction port of a suction member disposed around the receiving surface. Manufacturing method. In a glass gob manufacturing apparatus comprising a lower mold having a receiving surface for receiving a dropped molten glass drop,
An apparatus for producing a glass gob comprising a suction device for forming a gas flow from the center of the receiving surface toward the outer periphery. In a glass molded body manufacturing apparatus comprising: a lower mold having a receiving surface for receiving a dropped molten glass droplet; and an upper mold for pressing the received molten glass droplet together with the lower mold.
An apparatus for producing a glass molded body, comprising a suction device for forming a gas flow from the center of the receiving surface toward the outer periphery.

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