JP5936724B2 - Molding part of glass manufacturing equipment - Google Patents

Description

  The present invention relates to a molded part of a glass manufacturing apparatus used when a glass molded product such as a plate glass for a liquid crystal display display substrate is produced using a fusion method, and a method of manufacturing a glass molded product using the same.

  Conventionally, a fusion method is known as a method for producing a glass sheet having a very thin plate thickness by continuously forming a glass molded product from molten glass.

  In the fusion method, first, molten raw glass is poured into a molded part formed of an alumina-based or zircon-based refractory ceramic material having a bowl-shaped groove, and when the molten glass is poured in excess of the groove capacity of the molded part, the upper end of the groove side surface The molten glass overflows from the glass, and the glass joined together at the lower end of the forming part is stretched in the vertical direction, cooled and solidified to produce a plate glass. The fusion method does not apply excessive force when molding glass, can be manufactured with less damage to glass, and the surface of the glass molded product is formed only with a free surface, so a liquid crystal display This is a method suitable for manufacturing a glass molded product that requires high flatness accuracy such as a plate glass for a substrate (see, for example, Patent Document 1).

  However, it becomes difficult to produce a molded part formed of an alumina-based or zircon-based refractory ceramic material as the length of the molded part corresponding to the width of the glass molded product increases. For this reason, in the production of a molded part for manufacturing a wide and large glass molded product, integral molding is desirable. However, in the case of large glass molding, integral molding is impossible. After the parts are manufactured separately, an integrated molded part must be manufactured by connecting them. Therefore, a seam is formed in the molded part for manufacturing the completed large glass molded product. For this reason, in order to prevent the generation | occurrence | production of the stripe | line | muscle in a seam and to ensure flat precision about the glass molded product shape | molded, a high precision grinding | polishing finish or the cover by platinum is needed.

  In addition, molded parts made of refractory ceramic materials such as alumina and zircon are eroded by contact with molten glass, resulting in deterioration in quality over time, such as a decrease in flatness accuracy of molded glass products, and glass production. The continuous use time of the device could not be extended.

  Therefore, by covering the surface of the molded part with platinum or a platinum alloy, the molded part made of a refractory ceramic material is prevented from being eroded by contact with the molten glass. A method for protecting a seam that has been proposed has been proposed (see, for example, Patent Document 2 or 3).

US Pat. No. 3,338,696 JP 2002-255575 A JP 2007-153713 A

  However, since the molded part is supported at both ends in the longitudinal direction by support members made of a refractory material, warping occurs near the center due to the weight of the molded part and the glass when the size of the glass molded product increases. As a result, the flow rate downward changes depending on the position where the molten glass overflows from the forming part, and there is a problem that it becomes difficult to form a homogeneous glass such as the glass thickness being different.

  Moreover, since platinum or platinum alloy has low rigidity at high temperature, even when the molded part is coated with platinum or platinum alloy, it is not possible to prevent the deformation of the molded part over time and solve the above problems. I couldn't.

  Therefore, the present invention satisfies both the suppression of the erosion of the molded part due to contact with the molten glass and the maintenance of the rigidity of the molded part at high temperatures, and can be manufactured stably for a long time regardless of the size of the glass molded product. It aims at providing the manufacturing part of the glass manufacturing apparatus using the shaping | molding part of the glass manufacturing apparatus using a fusion method, and it.

  As a result of various investigations on the structure and material composition of the molding part of a glass manufacturing apparatus used when manufacturing a glass molded article using the fusion method, the present inventor has determined the contact portion with the molten glass in the molding part. As long as the molded part is formed of iridium and can be prevented from coming into contact with oxygen, erosion caused by molten glass can be suppressed as in the case of platinum or a platinum alloy, and high rigidity can be obtained at a high temperature. As a result, the inventors have found that the above problems can be solved, and have completed the invention.

That is, the molding part of the glass manufacturing apparatus according to the present invention is a molding part of a glass manufacturing apparatus used when manufacturing a glass molded product using the fusion method, and the molding part has a structure formed of iridium. Alternatively, the surface portion of the surface of the portion made of iridium that has a structure in which the structure is covered with iridium, the contact portion with the molten glass is formed of iridium, and is not in contact with the molten glass. (Hereinafter, it may be simply referred to as a surface portion (N).) The surface portion (N) is both ends of the molded portion, and the molded portion is in contact with the surface portion (N) and the atmosphere. has air shielding means for blocking, the atmosphere-shielding means, Ri support member der consisting refractory material for supporting the molding unit while protecting the surface portion (N), said forming section, said support Part The pressure from both ends exerted inward by the upper surface of the forming unit, characterized in that it is held in a straight line. Of the outer surface made of iridium, both end faces in the longitudinal direction of the molded part and its edges do not contact with the molten glass, so that the outer surface is oxidized and volatilized by blocking contact with the atmosphere by the support member. Can be prevented. Since iridium has high rigidity at high temperatures and small creep deformation due to compressive load, deformation of the molded part can be prevented when used as a structural material or a covering material of the molded part.

  The molding part of the glass manufacturing apparatus according to the present invention has a hollow body structure formed of iridium, and the air shielding means further includes inert gas or hydrogen gas and inert gas in the internal space of the hollow body. The case where it is piping for supplying mixed gas with gas is included. In order to reduce the weight of the molded part, it is preferable that the inside has a hollow structure. At this time, by providing a pipe for passing an inert gas or a mixed gas of hydrogen gas and inert gas in the internal space of the hollow body, the iridium on the inner surface of the hollow body comes into contact with oxygen in the atmosphere and is oxidized and volatilized. Can be prevented.

  The molded part of the glass manufacturing apparatus according to the present invention has a structure in which the structure is covered with iridium, and the air shielding means further includes a gap between the structure and the covered iridium. The case of a pipe for supplying an inert gas or a mixed gas of hydrogen gas and inert gas is included. By providing the piping, it is possible to prevent iridium from being oxidized and volatilized by the gap between the structure and iridium covering the structure and the air present in the structure.

  In the shaping | molding part of the glass manufacturing apparatus which concerns on this invention, when using piping which supplies inert gas as an atmospheric shielding means, it is preferable that the said inert gas is nitrogen gas. Oxygen can be cut off economically.

  The forming part of the glass manufacturing apparatus according to the present invention includes a case where a metal or ceramic beam is passed through an internal space of a hollow body made of iridium to support the forming part. Deformation can be prevented by increasing the rigidity of the molded part.

  The molded part of the glass production apparatus according to the present invention includes a case where the structure covered with iridium is formed of ceramics or metal, and the molded part is supported by the structure.

  In the shaping | molding part of the glass manufacturing apparatus which concerns on this invention, the case where the material of the said metal or ceramic beam or the said structure covered is iridium is included.

  In the shaping | molding part of the glass manufacturing apparatus which concerns on this invention, it is preferable that the thickness of the said covered iridium is 0.5-3.0 mm. If it is this thickness, sufficient high temperature intensity | strength can be provided to a shaping | molding part.

  The present invention can reduce the warpage of the molded part and the molded part due to the weight of the glass regardless of the size of the glass molded article when manufacturing the glass molded article using the fusion method, and the molded part is molten glass. Erosion due to contact with can be reduced. As a result, a glass molded product can be stably produced over a long period of time using the fusion method.

  Hereinafter, the present invention will be described in detail with reference to embodiments, but the present invention is not construed as being limited to these descriptions. As long as the effect of the present invention is exhibited, the embodiment may be variously modified. In addition, the same code | symbol was attached | subjected to the same member and the same site | part.

  FIG. 1 shows a schematic front view of a glass manufacturing apparatus according to this embodiment. Here, the manufacturing method of the glass molded article by a fusion method is demonstrated first using FIG. As shown in FIG. 1, the upstream side support member 2 and the downstream side support member 3 are engaged with both ends 9 and 10 of the molding portion 1, respectively, and pressure is applied from both ends 9 and 10 to the inside, thereby forming the molding. The upper surface 4 of the part is held linearly. The upstream support member 2 is provided with a molten glass introduction path 5.

  The introduction path 5 is provided to supply the clarified molten glass to the groove portion 6 of the molding portion 1, and the supplied molten glass extends from the upstream support member 2 side to the downstream support member along the groove portion 6. It flows to 3 side and overflows from the upper surface 4 of the molding part 1.

  Overflowing molten glass (not shown) flows along the side surface 7 of the molding part 1, is integrated at the lower end 8, and pulled downward to continuously form a plate-like glass molded product.

  Next, the shaping | molding part of the glass manufacturing apparatus which concerns on this embodiment is demonstrated. In FIG. 1, as for the shaping | molding part 1, the contact part with a molten glass is formed with iridium. That is, at least the surface of the groove 6, the upper surface 4, and the side surfaces 7 are formed of iridium. Furthermore, the shaping | molding part 1 of the glass manufacturing apparatus which concerns on this embodiment has the air | atmosphere interruption | blocking means which interrupts | blocks the contact with the surface part which is not in contact with molten glass among the surfaces which consist of iridium.

  Iridium is less susceptible to erosion by molten glass, and has high rigidity even at high temperatures during glass production. Therefore, creep deformation is small due to compressive load, so it is molded when used as a structural material or coating material for molded parts. The deformation of the part can be prevented, and the molded part 1 can produce a high-quality glass molded product for a long period of time.

  However, iridium reacts with oxygen in the atmosphere at a high temperature to be oxidized and volatilized, so that consumption tends to proceed. Therefore, in the shaping | molding part 1 of the glass manufacturing apparatus which concerns on this embodiment, the part which is not contacting molten glass is provided with the air | atmosphere interruption | blocking means which interrupts | blocks the contact with air | atmosphere. By providing the air blocking means, it is possible to suppress wear while maintaining high rigidity even at high temperatures during glass production, so that high-quality and high-precision glass molded products are produced continuously for a long time. It became possible. Hereinafter, the molded part 1 will be described by dividing it into five forms (from the first embodiment to the fifth embodiment). There are variations in the air blocking means depending on each form, and they will be described together.

  2 to 6 show schematic cross-sectional views of the forming portions 1a, 1b, 1c, 1d, and 1e of the glass manufacturing apparatus according to the first to fifth embodiments. As shown in FIG. 2, the molding part 1a of the glass manufacturing apparatus according to the first embodiment is an integral molding part 1a, and the entire molding part 1a is formed of a single material of iridium. In FIG. 1, the outer surface of the molded part 1 made of iridium that does not come into contact with glass includes both ends 9 and 10 of the molded part 1. Therefore, it is preferable that the upstream support member 2 and the downstream support member 3 are used as atmospheric shielding means to protect the end surfaces of both ends 9 and 10 and their edges from contact with the atmosphere. This is to prevent iridium from reacting with oxygen in the atmosphere at high temperatures to be oxidized and volatilized and consumed. Further, the upstream side support member 2 and the downstream side support member 3 apply pressure inward from both ends 9 and 10 of the molded part, whereby the upper surface 4 of the molded part is held linearly. In order to hold it in a straight line, it is preferable to provide a pressure adjusting means (not shown) for adjusting the pressure inward by the support members 2 and 3. The pressure adjusting means is, for example, a slide mechanism that adjusts the distance between the support members 2 and 3. Since the degree of creep deformation varies depending on the temperature, the inward pressure by the support member can be adjusted as needed by the pressure adjusting means.

  As shown in FIG. 3, the molding part 1b of the glass manufacturing apparatus according to the second embodiment has a structure in which a structure 15a formed of a ceramic material or a metal material is covered with a coating layer 17 made of iridium. The structure 15a is a bulk body.

  On the other hand, the molding part 1c of the glass manufacturing apparatus according to the third embodiment has a hollow structure in which a structure 15b formed of a ceramic material or a metal material has an internal space 21, as shown in FIG. In this case, the molded part 1c can be reduced in weight.

  In the second embodiment or the third embodiment, in FIG. 3 or FIG. 4, when air enters or exists in the gap 30 between the structures 15 a and 15 b and the coating layer 17 made of iridium covering the structures 15 a and 15 b, Since iridium reacts with oxygen in the atmosphere and oxidizes and volatilizes, a pipe for supplying an inert gas or a mixed gas of inert gas and hydrogen to the gap 30 between the molding parts 1b and 1c as an air blocking means (in FIG. 1) It is preferable to provide the piping 11). For example, as shown in FIG. 1, a gas supply pipe 11 is provided at one of both ends 9, 10 of the molding parts 1 b, 1 c. The inert gas or the mixed gas of inert gas and hydrogen supplied here is discharged from the structural gap between the molded parts 1b and 1c, but the gas is discharged to the other of the ends 9 and 10 of the molded parts 1b and 1c. An exhaust pipe 12 may be further provided to discharge the gas. Here, the inert gas is preferably nitrogen gas. The contact between the coating layer 17 made of iridium and oxygen can be economically cut off. Moreover, the ratio of hydrogen mixed in the inert gas is preferably 0.1 to 20%. Furthermore, since iridium on the outer surfaces of both ends 9 and 10 of the molded parts 1b and 1c does not come into contact with the molten glass, the support members 2 and 3 are also used as the air blocking means as in the first embodiment, and are not in contact with the molten glass. It is preferable to protect the iridium by blocking the portion from the atmosphere by the support members 2 and 3.

  As shown in FIG. 5, the molding part 1d of the glass manufacturing apparatus according to the fourth embodiment has a structure of a hollow body 19a formed of iridium. In order to reduce the weight of the molded part and reduce the material cost, the molded part 1d preferably has a hollow structure. In this case, by supplying an inert gas or a mixed gas of hydrogen gas and inert gas to the internal space 21 of the hollow body 19a, iridium on the inner surface of the hollow body comes into contact with oxygen in the atmosphere and is oxidized and volatilized. Can be prevented. Therefore, it is preferable to provide a pipe (pipe 11 in FIG. 1) for supplying an inert gas or a mixed gas of inert gas and hydrogen to the internal space 21 of the hollow-shaped molding part 1d as an air blocking means. Similarly to the second embodiment, a gas discharge pipe 12 may be further provided to discharge the gas. The inert gas is preferably nitrogen gas. Furthermore, also in the molding part 1d, it is preferable that the supporting members 2 and 3 are also the air blocking means as in the first embodiment.

  As shown in FIG. 6, a molding part 1e of a glass manufacturing apparatus according to the fifth embodiment is formed by passing a beam 23 of a metal or ceramic material through an internal space 21 of a hollow body 19b made of iridium. Is supported. The beam 23 can increase the rigidity of the molded portion 1e to prevent deformation. Since the beam 23 has good workability if it is a metal, a member having a cross section of I shape (for example, shown in FIG. 6), H shape, T shape, groove shape, or mountain shape (L shape) can be used. Also in the molding part 1e, it is preferable to provide the same air blocking means as in the fourth embodiment, that is, a pipe for supplying an inert gas or a mixed gas of inert gas and hydrogen. Further, a gas discharge pipe 12 may be further provided. The inert gas is preferably nitrogen gas. Furthermore, as in the first embodiment, the support members 2 and 3 are preferably air blocking means.

  Here, examples of the ceramic material in the second, third, and fifth embodiments include refractory ceramic materials such as alumina, zircon, mullite, and silica alumina. Examples of the metal material include high temperatures. Examples thereof include heat-resistant metal materials such as iridium, iridium alloy, molybdenum, molybdenum alloy, tungsten, tungsten alloy, and nickel alloy having strength.

  In the molding part of the glass manufacturing apparatus according to this embodiment, in any of the first to fifth embodiments, the support members 2 and 3 are made of a refractory material such as alumina, zirconia, zircon, silicon nitride, boron nitride. It is preferable to become.

  In the molding part of the glass manufacturing apparatus according to the present embodiment, the thickness of the iridium coating layer 17 is preferably 0.5 to 3.0 mm. If it is thinner than 0.5 mm, the plate material may be deformed by its own weight or the like, and if it is thicker than 3.0 mm, it becomes difficult to maintain the flatness of the surface as a plate.

  The glass molded product manufacturing method according to the present embodiment includes, for example, FIG. 1 in addition to the method of manufacturing using the molded portions 1a, 1b, 1c, 1d, and 1e of the first to fifth embodiments. In the glass manufacturing apparatus using the fusion method as shown, the manufacturing atmosphere surrounding the molding part 1 can be manufactured as an inert gas atmosphere or a mixed gas atmosphere of hydrogen gas and inert gas. According to this method, as in the first to fifth embodiments, the iridium in the molded part is blocked from coming into contact with the atmosphere, and is prevented from being oxidized and volatilized. Therefore, it is possible to produce glass for a long time.

  In the glass manufacturing apparatus shown in FIG. 1, the molded part of the glass manufacturing apparatus shown in FIGS. 2, 3, and 6 is manufactured, and the portion formed with iridium is in its processed state (presence of cracks during material processing). The surface flatness). Thereafter, the molten aluminosilicate glass is introduced into the groove portion of the molded portion 1 from the introduction path 5 while applying pressure to both ends 9 and 10 of the molded portion inward by the support members 2 and 3 in a nitrogen gas atmosphere under the following conditions. 6, overflowed from the upper surface 4, and pulled downward at a speed of 100 to 300 m / hour to continuously produce plate glass. The determination of the quality of the molded part was made by visually checking the state of the molded part (presence of volatilization of the surface, presence of warpage of the upper part) when it was used again for one week after continuous use for one week.

Example 1
The molded part 1 of FIG. 2 was made of iridium.

(Example 18)
Zircon was used as the structure 15a of the molded part 1b in FIG. 3, and the covering layer 17 was coated with iridium to a thickness of 0.5 mm.

(Example 19)
The iridium was used as the structure 15a of the molded part 1b in FIG. 3, and the coating layer 17 was coated with iridium to a thickness of 3.0 mm.

(Comparative Example 1)
The molding part 1a of FIG. 2 was produced with zircon.

(Comparative Example 10)
Zircon was used as the structure 15a of the molded part 1b in FIG. 3, and the coating layer 17 was coated with iridium to a thickness of 0.3 mm.

(Comparative Example 11)
The iridium was used as the structure 15a of the molded part 1b in FIG. 3, and the coating layer 17 was coated with iridium to a thickness of 3.5 mm.

  The results are shown in Tables 1 and 2. For Examples 1, 18 and 19, it was confirmed that there was no problem, such as warp after cooling after use and after reuse, but for Comparative Examples 1 and 10, warpage etc. was confirmed at the top, Could not be used again. Moreover, about the comparative example 11, since there was a difference in the flatness of the surface and there exists a possibility that a difference may arise in the thickness of glass by a location, it could not be used.

It is a front schematic diagram of a glass manufacturing device showing an example of an embodiment of the present invention. It is a section schematic diagram of a forming part of a glass manufacture device showing a 1st embodiment of the present invention. It is the cross-sectional schematic of the shaping | molding part of the glass manufacturing apparatus which shows 2nd Embodiment of this invention. It is a cross-sectional schematic diagram of the shaping | molding part of the glass manufacturing apparatus which shows 3rd Embodiment of this invention. It is a cross-sectional schematic diagram of the shaping | molding part of the glass manufacturing apparatus which shows 4th Embodiment of this invention. It is a cross-sectional schematic diagram of the shaping | molding part of the glass manufacturing apparatus which shows 5th Embodiment of this invention.

1, 1a, 1b, 1c, 1d, 1e Molded portion 2 Upstream support member 3 Downstream support member 4 Upper surface 5 Inlet path 6 Groove portion 7 Side surface 8 Lower end 9, 10 Side end 11 Gas supply piping 12 Gas discharge piping 15a 15b Structure 17 Coating layer 19a, 19b Hollow body 21 Internal space 23 Beam 30 Gap

Claims (8)

In the molding part of the glass manufacturing apparatus used when manufacturing a glass molded product using the fusion method,
The molded part has a structure formed of iridium, or has a structure in which the structure is covered with iridium, a contact part with molten glass is formed of iridium, and a part of iridium is formed. Having a surface portion (N) that is not in contact with the molten glass among the surfaces
The surface portion (N) is both ends of the molded part,
The molded part has an air shielding means for blocking contact between the surface portion (N) and the atmosphere,
Atmosphere-shielding means, Ri support member der consisting refractory material for supporting the molding unit while protecting the surface portion (N),
The molding part of the glass manufacturing apparatus is characterized in that the upper surface of the molding part is held in a straight line by pressure from both ends to the inside applied by the support member . The molding part has a hollow body structure made of iridium, and the air shielding means further supplies an inert gas or a mixed gas of hydrogen gas and inert gas to the internal space of the hollow body. The forming part of the glass manufacturing apparatus according to claim 1 , wherein the forming part is a pipe for the purpose. The molded portion has a structure in which the structure is covered with iridium, and the air shielding means further includes an inert gas or hydrogen gas in a gap between the structure and the iridium that is covered. The forming part of the glass manufacturing apparatus according to claim 1 , wherein the forming part is a pipe for supplying a mixed gas with an inert gas. The said inert gas is nitrogen gas, The shaping | molding part of the glass manufacturing apparatus of Claim 2 or 3 characterized by the above-mentioned. The molding part of the glass manufacturing apparatus according to claim 2 , wherein a metal or ceramic beam is passed through an internal space of the hollow body made of iridium to support the molding part. 4. The molded part of the glass manufacturing apparatus according to claim 1 or 3 , wherein the iridium-coated structure is formed of ceramics or metal, and the molded part is supported by the structure. . The said metal is iridium, The shaping | molding part of the glass manufacturing apparatus of Claim 5 or 6 characterized by the above-mentioned. Said coating to have a thickness of iridium, forming part of the glass manufacturing apparatus according to claim 1, 3 or 6, characterized in that a 0.5 to 3.0 mm.

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