WO2013108572A1 - Feuille de démoulage et procédé de moulage d'article moulé en verre - Google Patents

Feuille de démoulage et procédé de moulage d'article moulé en verre Download PDF

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Publication number
WO2013108572A1
WO2013108572A1 PCT/JP2012/084054 JP2012084054W WO2013108572A1 WO 2013108572 A1 WO2013108572 A1 WO 2013108572A1 JP 2012084054 W JP2012084054 W JP 2012084054W WO 2013108572 A1 WO2013108572 A1 WO 2013108572A1
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WO
WIPO (PCT)
Prior art keywords
mold
release sheet
glass
molding
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2012/084054
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English (en)
Japanese (ja)
Inventor
志郎 舩津
知治 林
勝浩 鈴木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AGC Inc
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Asahi Glass Co Ltd
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Filing date
Publication date
Application filed by Asahi Glass Co Ltd filed Critical Asahi Glass Co Ltd
Publication of WO2013108572A1 publication Critical patent/WO2013108572A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B40/00—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it
    • C03B40/005—Fabrics, felts or loose covers
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/65—Means for releasing gas trapped between glass and press die
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2215/00—Press-moulding glass
    • C03B2215/66—Means for providing special atmospheres, e.g. reduced pressure, inert gas, reducing gas, clean room
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

Definitions

  • the present invention relates to a release sheet and a method for molding a glass molded product for improving the mold releasability between glass and a mold and efficiently molding a glass molded product.
  • Patent Document 1 discloses a molding method in which a release film such as carbon is formed on a glass material contact surface of a mold, and the mold and the glass material are released after press molding.
  • the glass molded product is formed by cutting, polishing, etc., it takes time to process the complicated and fine shape of the casing, and it is difficult to increase productivity. If such a glass molded product can be molded by applying conventional press molding, the production efficiency can be improved and a casing with high shape accuracy can be molded.
  • the molding time that is, the time when the release film and the glass material are in contact with each other under a high temperature is relatively long (several minutes Degree).
  • the release film as in Patent Document 1 is likely to be deteriorated by repeated press molding and loses the release performance at an early stage. For this reason, the glass material and the mold cannot be released smoothly, which hinders the improvement of productivity beyond a certain level.
  • the present invention has been made paying attention to the above-mentioned problems, and even when the heating time is lengthened in the molding of a glass molded product, the glass material is smoothly released from the mold, thereby improving productivity and workability. It aims at providing the mold release sheet which can be improved, and the shaping
  • the release sheet of the present invention is a release sheet that is interposed between the mold and the glass material when the glass material is press-molded by a mold having an upper mold and a lower mold, and is a test gas.
  • the gas permeability is 0.01 to 100 L / min ⁇ cm 2 when measured at a differential pressure of 0.05 Pa using air.
  • the glass molding product molding method of the present invention is a glass molding product molding method in which a glass material is press-molded by a molding die having an upper die and a lower die, wherein the upper die or the lower die forming surface and the The method includes a step of interposing the release sheet between glass materials, and a step of press-molding the glass material by bringing the upper mold and the lower mold close to each other.
  • the press-molded glass material does not adhere to the mold and can be released smoothly. Further, according to the method for molding a glass molded product of the present invention, the press-molded glass material can be smoothly released without adhering to the mold, and productivity and workability can be improved.
  • FIG. 1 is a schematic configuration diagram of an apparatus used in a method for molding a glass molded product according to an embodiment of the present invention
  • FIG. 2 is a schematic configuration diagram of the molding apparatus of FIG. Only the chamber 2 is shown in cross-section, and FIG. 2 shows only the lower plate of each stage and shows the positional relationship of the plates in each stage).
  • FIG. 3A is a side cross-sectional view of a mold 11 used in a method for molding a glass molded product according to an embodiment of the present invention.
  • a glass molded product molding apparatus 1 includes a chamber 2 serving as a molding chamber for molding a glass material 50 to be described later, a heating stage 3 provided inside the chamber 2, a press molding stage 4, and cooling. And stage 5.
  • the chamber 2 which is a molding chamber, provides a place for molding a glass material inside.
  • the glass material 50, the release sheet 12, the middle mold 11 b and the lower mold 11 c are taken into the intake 6, and after the press molding is finished, the molded glass material 50, the release sheet 12, the middle mold A take-out port 7 for taking out 11b and the lower mold 11c is provided.
  • the intake port 6 and the extraction port 7 are respectively provided with an intake shutter 6a and an extraction shutter 7a. If necessary, the take-in shutter 6a and the take-out shutter 7a are opened and closed so that the mold can be taken in and out of the chamber 2 and the atmosphere in the chamber 2 is maintained.
  • the intake port 6 and the extraction port 7 are provided with mold mounting tables 8 and 9 on which the lower mold 11c can be mounted outside the chamber 2, respectively.
  • a heating stage 3 Inside the chamber 2, a heating stage 3, a press molding stage 4 and a cooling stage 5 are provided, and the glass material is sequentially processed by these stages to obtain a desired shape.
  • the middle mold 11b, the sheet glass material 50, and the lower mold 11c on which the release sheet 12 is placed are taken into the chamber 2 from the intake port, and are moved in order while being processed in each of the above stages.
  • the lower mold 11c is taken out of the chamber 2 from the take-out port.
  • the atmosphere inside the chamber 2 is preferably an inert gas atmosphere such as nitrogen so that the mold 11 and the release sheet 12 are not oxidized.
  • the atmosphere may be an air atmosphere.
  • An inert gas atmosphere can be achieved by replacing the internal atmosphere with the chamber 2 having a sealed structure.
  • the chamber 2 has a semi-enclosed structure, and an inert gas is constantly supplied into the chamber 2 so that external air does not flow in while maintaining a positive pressure in the chamber so that an inert gas atmosphere is maintained. It may be.
  • the intake shutter 6a and the extraction shutter 7a described above are effective for making the inside of the chamber 2 a semi-sealed state with a simple configuration.
  • the chamber 2 and the shutters 6a and 7a are preferably formed of a material such as stainless steel or alloy steel, and are preferably a material from which gas and impurities do not precipitate at high temperatures. It is also possible to further suppress the air inflow from the outside to the chamber 2 by making the outer periphery of the shutters 6a, 7a (including the mold mounting bases 8, 9) hermetically sealed.
  • the molding die 11 shown in FIG. 3A is composed of an upper die 11a that forms a housing shape on the upper surface, a middle die 11b that forms a housing shape on the outer edge, and a lower die 11c that forms a housing shape on the lower surface.
  • the release sheet 12 is interposed between the lower mold 11 c and the glass material 50.
  • the upper die 11a is fixed in the press molding stage 4 shown in FIG. 1, and the lower die 11c can move on each stage while the middle die 11b, the release sheet 12 and the glass material 50 are placed thereon.
  • the mold may have a shape capable of obtaining one glass molded article or two or more glass molded articles.
  • the mold 11 may be formed of a material that can stably give the shape of the molded product by press molding, for example, a material such as cemented carbide, ceramics, SUS, or carbon. However, cemented carbide and ceramics are preferred so that they do not easily deform.
  • a release film that suppresses sticking between the molded product and the mold after press molding such as a noble metal film such as Ir-Re, a carbon film such as DLC, and a plated film such as Cr. It is preferable to provide a membrane.
  • the upper mold 11a, the middle mold 11b, and the lower mold 11c each have a molding surface for transferring the shape of each surface of the glass molded product to be molded. These shapes are not particularly limited as long as they can be formed into a product casing.
  • the middle mold 11b functions as a guide for the upper mold 11a and forms the side shape of the molded product.
  • the upper mold 11a or the lower mold 11c and the middle mold 11b may have a continuous and indistinguishable shape.
  • As the shape of the housing a shape having a free curved surface is particularly preferable, and the obtained housing is preferably an axially asymmetric shape.
  • the conventional molding by polishing or the like molding of such a complicated shape has been difficult or expensive, but in this embodiment, molding is easily performed at low cost by press molding. it can.
  • one surface of the press-molded product (transfer surface by the upper mold 11a) is directly used as the product surface, and the other surface (transfer surface by the lower mold 11c) is used as the product surface.
  • the release sheet of this embodiment is applied to surfaces other than the product surface.
  • the release sheet 12 of this embodiment has a gas permeability of 0.01 to 100 L / min ⁇ cm 2 , preferably 1 to 100 L / min ⁇ cm 2 , and 10 to 100 L / min ⁇ cm 2 . More preferably.
  • the release sheet 12 is not particularly limited as long as it has such a gas permeability.
  • a sheet obtained by rolling a raw material such as carbon, silicon carbide, silicon nitride, glass fiber, asbestos, a ceramic thin plate, or a heat insulating material cloth It is preferable to use a metal foil or the like.
  • the release sheet 12 has the above gas permeability so that the gas between the glass material 50 and the release sheet 12 is permeated and released to the outside during press molding.
  • the sheet may be provided with a vent 12a, or a fiber material may be used for forming the sheet, and the sheet may be a woven or non-woven fabric with a coarse mesh.
  • a release film such as a noble metal film such as Ir—Re, a carbon film such as DLC, and a plating film such as Cr may be provided on the surface of the release sheet 12.
  • FIG. 4 is a plan view of the release sheet 12 according to an embodiment of the present invention.
  • FIG. 4 shows the release sheet 12 when the air holes 12a are formed.
  • the hole diameter (diameter, hereinafter the same) of the vent hole 12a is preferably 0.01 to 2 mm, and more preferably 0.1 to 1 mm.
  • the hole diameter is less than 0.01 mm, the gas that has entered between the release sheet 12 and the glass material 50 during the molding remains without being discharged, and the moldability may decrease.
  • the hole diameter of the vent hole 12a exceeds 2 mm, the glass material 50 enters from the vent hole and adheres to the lower mold 11c, which may deteriorate the releasability.
  • the air holes 12a can be formed by a method such as punching or pressing.
  • the gas permeability is measured by a differential pressure method using air as a test gas at a differential pressure of 0.05 Pa.
  • the pore diameter is preferably 0.01 ⁇ m to 1 mm. More preferably, the thickness is from 02 to 0.05 ⁇ m.
  • the porosity is preferably 20 to 60%, more preferably 30 to 40%.
  • the pore diameter is less than 0.01 ⁇ m, the gas that has entered between the release sheet 12 and the glass material 50 during molding remains without being discharged, and the moldability may be reduced.
  • the pore diameter exceeds 1 mm, the glass material 50 enters from the vent hole and adheres to the lower mold 11c, which may cause inferior mold releasability.
  • the porosity when the porosity is less than 20%, the gas that has entered between the release sheet 12 and the glass material 50 during the molding remains without being discharged, and the moldability may be deteriorated.
  • the porosity exceeds 60%, the strength of the release sheet 12 is insufficient, and the release sheet 12 may be broken during molding.
  • the porosity can be calculated by dividing the weight of the release sheet 12 per unit volume by the density of the material of the release sheet 12.
  • the release sheet 12 of the present embodiment may have a desired gas permeability by providing the above-described air holes 12a on a woven or non-woven fiber material.
  • the material of the release sheet 12 a material having heat resistance capable of withstanding the temperature at the time of press molding and not reacting with the glass material can be used, and examples thereof include carbon, silicon carbide, and silicon nitride. In the case of carbon, it is particularly preferable because it is excellent in releasability.
  • the release sheet 12 made of carbon can be obtained by heat-treating a graphite raw material and then rolling it to form a layered crystal structure. In order to stabilize the physical properties even at high temperatures and inhibit the reaction with the glass material, it is preferable that the release sheet 12 made of the carbon material does not substantially contain impurities such as a binder. Such a release sheet 12 is further excellent in acid resistance and alkali resistance.
  • the thickness of the release sheet 12 is preferably 0.2 to 3 mm, more preferably 0.2 to 1 mm. When it is less than 0.2 mm, handling is difficult, and deterioration is caused by heating at about 380 ° C. or more, and the mold release performance tends to be lowered. If it exceeds 3 mm, the shape of the lower mold 11c may not be accurately transferred to the glass material.
  • the heating stage 3 of the present embodiment has a heating plate 3b in which a temperature variable heater 3a is embedded in order to soften the glass material 50 placed on the lower mold 11c.
  • the heating plate 3b heats the lower mold 11c by contacting the lower mold 11c, and can indirectly heat the release sheet 12 and the glass material 50 placed on the lower mold 11c.
  • the heating stage 3 includes a temperature variable heater 3d for directly heating and softening the glass material 50.
  • the heater include a heating element capable of radiation heating such as a cartridge heater, a ceramic heater, a SiC heater, and a carbon heater. These heaters may be configured to be embedded in, for example, a metal plate such as stainless steel or ambiloy or a glass tube such as quartz.
  • the heating plate 3b is fixed to the bottom plate of the chamber 2 via the heat insulating plate 3c so that the heat of the plate itself is not transmitted to the chamber 2 as it is.
  • the press molding stage 4 of the present embodiment has a pair of press plates 4b.
  • the press molding stage 4 includes a pair of upper and lower press plates 4b in which a temperature variable heater 4a is embedded. The press using the press plate 4b is performed while maintaining the previous heating temperature.
  • a cooling mechanism may be provided between the pair of upper and lower press plates and the heat insulating plate so that the cooling rate of the plate and the mold can be controlled (so that the cooling can be accelerated).
  • a cooling means an air cooling system or a water cooling system can be used.
  • the upper and lower press plates 4b are connected to the shaft 4d, and the shaft 4d allows the press plate 4b to move up and down by a cylinder (not shown).
  • a cylinder not shown
  • press molding is performed at a predetermined pressure, and a glass molded product shape can be imparted to the plate-shaped glass material with high accuracy.
  • the upper and lower press plates 4b are connected to the shaft 4d via the heat insulating plate 4c so that the heat of the upper and lower press plates 4b is not directly transferred to the chamber 2.
  • only one of the upper and lower press plates can be made movable and the other can be fixed to the chamber 2.
  • the press plate 4b to be fixed is the same as the heating plate 3b. What is necessary is just to fix on the chamber 2 via the heat insulation board 4c so that heat may not be transmitted to the chamber 2 as it is.
  • the cooling stage 5 of the present embodiment cools and solidifies the glass material 50 provided with the glass molded product shape placed on the lower mold 11c, so that a cooling plate 5b in which a temperature variable heater 5a is embedded is provided.
  • the cooling plate 5b can cool the lower mold 11c by being brought into contact with the lower mold 11c that has undergone the press molding process, and can also indirectly cool the glass material 50 placed on the lower mold 11c. Since there is a case where the upper part of the glass molded product placed on the lower mold 11c on the cooling plate 5b is in an open state and the cooling rate becomes too fast, the heater 3d described in the heating stage is provided above the glass material 50.
  • a cooling source can be controlled by providing a heating source.
  • the cooling plate 5b is fixed to the bottom plate of the chamber 2 via the heat insulating plate 5c so as not to transfer the heat of the cooling plate 5b to the chamber as it is.
  • the solidification of the plate-like glass material by bringing the cooling plate 5b into contact with the mold may be performed at a temperature below the glass transition point of the material, more preferably below the strain point.
  • cooling refers to the temperature at which the plate-shaped glass material is solidified so that the shape of the glass molded product can be stably imparted.
  • the temperature is only about 50 to 150 ° C. lower than the press plate, and is still high. For this reason, the heater 5a is embedded in the cooling plate 5b.
  • the press plate 4b is fixed to the shaft 4d via the heat insulating plate as described above, and the shaft 4d is connected to the cylinder.
  • the cylinder is only required to move up and down each plate.
  • a cylinder such as an electric servo cylinder, a hydraulic cylinder, and an electric hydraulic cylinder can be used.
  • the heating plate 3b, the press plate 4b, and the cooling plate 5b described above basically have a contact surface with the mold that is parallel to the horizontal plane.
  • the mold for the press plate 4b When the contact surface is inclined, the positions of the upper mold 11a, the middle mold 11b, and the lower mold 11c do not coincide with each other, and the glass molded product formed at this time may be a defective product. Therefore, the management of the plate in each of these stages and the alignment of the upper mold, the middle mold, and the lower mold are strictly performed.
  • the plate is made by inserting and fixing a cartridge heater inside a material such as stainless steel, carbide, alloy steel, etc., and heating the cartridge heater to raise the temperature of the plate to a desired temperature. Can be maintained.
  • the heat insulating plates 3c, 4c, 5c of each stage may be a known heat insulating plate such as ceramics, stainless steel, die steel, high-speed steel, etc., which has high hardness and is difficult to be deformed by pressure during press molding. Ceramics that do not generate a large amount are preferred. When using a metal-based material, it is preferable that the surface is coated with CrN, TiN, or TiAlN.
  • the heating stage 3, the press forming stage 4, and the cooling stage 5 described above form a place (stage) where predetermined processing is performed, and the lower mold 11c is formed so that the processing by each stage is performed smoothly in sequence. It is controlled by a control means that moves so as to be mounted on each stage at a predetermined timing by a conveying means (not shown).
  • the processing by the heating plate 3b, the press plate 4b, and the cooling plate 5b is performed in a predetermined manner while the lower mold 11c is sequentially transported and moved onto each plate in the above order.
  • the stage that has been processed is vacant.
  • the lower mold 11c on which another plate-like glass material is placed is further transported, and a plurality of glass molded products are continuously formed. Progress at the same time.
  • conveying means for performing this processing is not shown, for example, by a robot arm or the like, from the mold mounting table 8 to the heating stage 3, from the heating stage 3 to the press molding stage 4, from the press molding stage 4. What is necessary is just to be able to move to the cooling stage 5 and from the cooling stage 5 to the mold mounting table 9.
  • the control means also controls the temperature of the pair of upper and lower plates in each stage of the mold movement, heating, press molding, and cooling, the timing of the vertical movement, etc., and a series of molding operations smoothly, It is controlled so that it can be performed continuously. At this time, the opening and closing of the taking-in shutter and the taking-out shutter are also controlled. Further, it is preferable to control the supply amount and timing of nitrogen so that the atmosphere in the chamber 2 is filled with an inert gas.
  • this glass molded product molding apparatus 1 is a glass molded product molding apparatus that carries out predetermined processing while raising and lowering the temperature at one or more positions.
  • the lower mold 11c is placed on the mold placing table 8 on the intake side.
  • the middle mold 11b is arranged on the lower mold 11c, and the plate-like glass material 50 is placed on the lower mold 11c with the release sheet 12 interposed therebetween.
  • the intake shutter 6a is opened to open the intake port, and the lower mold 11c is conveyed onto the heating plate 3b by the conveying means.
  • the lower mold 11c is heated to the same temperature as the heating plate 3b because it contacts the lower heating plate 3b.
  • a heater 3d is disposed above the lower mold 11c conveyed on the heating stage, and the glass material 50 placed on the lower mold 11c is heated by radiation heating with the heater 3d. To do.
  • the temperature of the heating plate 3b is set so that the lower mold 11c is in the temperature range from the glass transition point to the softening point of the glass material 50, and the temperature of the heater 3d is capable of heating the glass material 50 to the temperature range from the yield point to the melting point.
  • Set to temperature By individually controlling the temperature range to be heated to different ranges in this way, the glass material 50 is conveyed in a softened state sufficient for press molding from the heating process to the pressing process, without being drooped. Make it possible.
  • the lower mold 11c can stably perform the pressing operation in the next press molding step, a glass molded product having a desired shape can be obtained.
  • the rate of temperature rise is preferably about 5 to 200 ° C./min.
  • the middle mold 11b, the lower mold 11c, the release sheet 12 and the plate-like glass material 50 sufficiently heated by the heating stage 3 are conveyed and placed on the press plate 4b by the conveying means.
  • the press plate 4b is also heated to the same temperature as that of the heating plate 3b, and can be immediately press-molded.
  • the upper press plate 4b is lowered to reduce the distance between the press plates 4b, thereby reducing the distance between the upper die 11a and the lower die 11c, so that the upper die plate 11c is placed above the lower die 11c.
  • the plate-shaped glass material 50 placed is deformed by applying pressure.
  • the upper mold 11a and the lower mold 11c are brought close to each other as described above, and press molding is performed by applying pressure from above and below the glass material 50.
  • the shape of the molded surface of the upper mold 11a, the middle mold 11b, and the lower mold 11c is transferred to the plate-shaped glass material 50, thereby giving a glass molded product shape.
  • the heating temperature is about the same as the temperature heated in the preceding heating stage, and the pressure applied to the plate-shaped glass material during pressing is preferably 0.001 to 2 kN / mm 2. 0.003 to 0.01 kN / mm 2 is particularly preferable.
  • the temperature of the upper and lower press plates 4b is lowered so that the molded glass material 50 is released from the upper mold 11a.
  • the temperatures of the upper mold 11a, the middle mold 11b, and the lower mold 11c are lowered by heat transfer.
  • the temperature of the press plate 4b can be changed by the heater 4a.
  • the temperature of the press plate 4b is lowered below the yield point of the used glass material 50, and the upper mold 11a. Can be raised.
  • a mechanism for forcibly releasing the mold may be provided on the upper mold 11a side to release the mold.
  • the released glass material 50 is placed again on the lower mold 11c and conveyed from the press plate 4b to the cooling plate 5b by the conveying means together with the release sheet 12, the middle mold 11b, and the lower mold 11c.
  • This transport means is the same as the transport means described above.
  • the lower mold 11c is cooled by the cooling plate 5b, which is cooled by bringing the lower mold 11c into contact with the lower cooling plate 5b, as in the heating step.
  • the glass material 50 whose contact area with the molding surface of the lower mold 11c has been increased by molding is cooled together with the release sheet 12, the middle mold 11b, and the lower mold 11c.
  • the take-out shutter 7a is opened from the chamber 2 to open the take-out port, and the lower mold 11c is taken out of the apparatus by the conveying means and placed on the mold placing table 9 on the take-out port side.
  • the cooling is preferably performed to a temperature below the glass transition point (Tg) of the plate-like glass material, and more preferably to a temperature below the strain point of the plate-shaped glass material.
  • the temperature lowering rate is preferably about 5 to 150 ° C./min.
  • the cooled glass material is released from the middle mold 11b and the lower mold 11c.
  • the release sheet 12 is removed from the glass material 50 and the release sheet 12 released from the mold 11 by a removing process.
  • a polishing method generally used for polishing a glass molded article is used.
  • a polishing method such as a rotary polishing method using an abrasive such as diamond, alumina, cerium oxide, or silica can be used. .
  • a rotary polishing method using a diamond is preferable from the viewpoint of polishing rate.
  • the release sheet 12 can be oxidized and removed in the air or in an oxidizing atmosphere by a heating furnace or the like in the removal step.
  • the temperature of the heating furnace when oxidizing and removing with a heating furnace is preferably 380 ° C. to a glass annealing point, more preferably 400 ° C. to a glass strain point.
  • the heating time is appropriately set depending on the size and thickness of the glass material, and specifically, 1 to 48 hours is preferable, and 1 to 8 hours is more preferable.
  • the temperature step by step it is preferable to change the temperature step by step, and by providing one or more heating stages in the heating step, the temperature of the plate-shaped glass material is increased step by step.
  • heating is performed to the molding temperature.
  • the cooling process by providing one or more cooling stages, the temperature of the plate-like glass material is lowered stepwise to a temperature of 200 ° C. or lower. In this way, by performing heating and cooling step by step, the rapid temperature change of the plate-shaped glass material is suppressed, and the characteristics of the glass molded product such as cracking and distortion are deteriorated. You can avoid it.
  • FIG. 5 shows an example of a glass molded product forming apparatus using a plurality of heating stages and cooling stages in order to carry out such a heating process and a cooling process.
  • the glass molding product molding apparatus 21 shown in FIG. 5 includes a chamber 22, a first heating stage 23, a second heating stage 24, a third heating stage 25, a press molding stage 26, a first cooling stage 27,
  • the apparatus has a second cooling stage 28 and a third cooling stage 29, and the chamber 22 can open and close the intake port 30 of the lower mold 11 c and the same as the glass molding product forming apparatus 1.
  • the take-out shutter 30a, the take-out port 31, the take-out shutter 31a that can be opened and closed, and the mold placement tables 32 and 33 are provided outside the take-in port 30 and the take-out port 31.
  • the glass molded product molding apparatus 21 has the same configuration as that of the glass molded product molding apparatus 1 in FIG. 1 except that three heating stages and three cooling stages are provided and heated and cooled in stages. .
  • preliminary heating is performed in which a plate-like glass material is once heated to a temperature below the glass transition point, preferably about 50 to 200 ° C. lower than the glass transition point.
  • the third heating stage 25 is heated to a temperature higher than the yield point of the glass, preferably about 5 to 150 ° C. higher than the yield point.
  • the glass may be heated to the softening point.
  • the press molding stage 26 performs a molding operation with a molding die while maintaining the molding temperature to give a glass molded product shape, and the first cooling stage 27 has a glass transition point or less, preferably a strain point or less, of the molding material.
  • the second cooling stage 28 is further cooled to a temperature at which the mold of 200 ° C. or lower is not oxidized, and the third cooling stage 29 is cooled to room temperature.
  • the third cooling stage can be efficiently cooled by using a water cooling plate provided with piping so that cooling water circulates instead of the heater in the other stage. Thereafter, the glass material obtained by cooling is subjected to processing such as cutting and polishing to obtain a final product.
  • Example 1 is an example and Example 2 is a comparative example.
  • Example 1 The glass molded product was molded as follows using the glass molded product molding apparatus 21 of FIG.
  • the glass molding product molding apparatus 21 used here uses a tungsten carbide 100 ⁇ 75 ⁇ 30 mm rectangular parallelepiped plate having three 1.5 kW cartridge heaters inside.
  • the heat insulating plate one obtained by superposing two 140 ⁇ 75 ⁇ 10 mm plate bodies made of SUS304 was used.
  • the cylinder that moves the upper plate up and down uses an air cylinder, and a shaft with a shaft diameter of 40 mm is connected and fixed to the upper plate.
  • the chamber was a box shape of 600 ⁇ 450 ⁇ 320 mm made of SS400, and the bottom plate of this chamber was 600 ⁇ 450 ⁇ 30 mm.
  • the forming die 11 includes an upper die 11a, a middle die 11b, and a lower die 11c, and is made of a cemented carbide made of tungsten carbide.
  • the shape of the glass molded product obtained by press molding is a shape having a free curved surface on the upper and lower surfaces, and a molding die for molding this glass molded product shape by one molding die was used.
  • As the release sheet 12A PERMA-FOIL (trade name (registered trademark), manufactured by Toyo Tanso Co., Ltd.) grade PF, a thickness of 0.38 mmt, through-holes with a hole diameter of 0.5 mm are formed at intervals of 4 mm, and gas permeability The one of 0.5 L / min ⁇ cm 2 was used.
  • a plate-like glass material containing an alkali metal oxide of 90 ⁇ 60 mm and a thickness of 4 mm was placed on the lower mold 11c with a release sheet 12A interposed therebetween.
  • the plate-like glass material has a strain point of 580 ° C., a glass transition point (Tg) of 620 ° C., and a yield point (At) of 700 ° C.
  • the lower mold 11c on which the plate-shaped glass material is placed is transported and placed on the first heating plate 23b by the transport means, and at the same time, the glass material 50 is heated by radiation from above by the upper heater 23d.
  • the lower mold 11c, the release sheet 12A and the plate-shaped glass material were heated for 120 seconds.
  • the glass material 50 was heated for 120 seconds by the upper heater 24d while being transported and placed on the second heating plate 24b.
  • the glass material 50 was heated for 120 seconds by the upper heater 25d at the same time as being transported and placed on the third heating plate 26b.
  • the plate-like glass material was softened.
  • the first heating plate 23b was set to 550 ° C.
  • the second heating plate 24b was set to 650 ° C.
  • the third heating plate 25b was set to 750 ° C.
  • the set temperature of the upper heater was 950 ° C.
  • the lower die 11c is transported and placed on the press plate 26b, the upper press plate 26b is lowered, and a pressure of 8 kN is applied to the plate-like glass material 50 by the air cylinder 26d, and press molding is performed for 120 seconds. Went.
  • the glass material 50 conveyed from the heating plate 23b is cooled (released) after the press operation, and the time until the lower mold 11c is transferred to the cooling plate 27b is 60 seconds.
  • the press plate 26b was again heated to the press temperature and maintained for 60 seconds.
  • the press temperature of the press plate 26b was 750 ° C.
  • the mold After pressing, the mold is conveyed onto the first cooling plate 27b and cooled for 120 seconds, then the mold is conveyed onto the second cooling plate 28b and cooled for 120 seconds, and the mold is further cooled to the third cooling. It was conveyed onto the plate 29b and cooled for 120 seconds.
  • the first cooling plate 27b was set to 450 ° C.
  • the second cooling plate 28b was set to 200 ° C.
  • the third cooling plate 29b was set to 20 ° C. (cooling water temperature).
  • the glass material 50 was cooled to room temperature or lower by a cooling process and taken out of the apparatus.
  • the taken-out press-molded product was separated from the lower mold 11c, and the gas residue was visually evaluated.
  • the glass was released without adhering to the lower mold 11c.
  • Example 2 As release sheet 12B, PERMA-FOIL (trade name (registered trademark), manufactured by Toyo Tanso Co., Ltd.) grade PF, with a thickness of 0.38 mmt, no through-holes, and a gas permeability of 0 L / min ⁇ cm 2 In the same manner as in Example 1, glass molding, gas residue evaluation and mold release evaluation were performed.
  • PERMA-FOIL trade name (registered trademark), manufactured by Toyo Tanso Co., Ltd.
  • the moldability can be improved and the glass molded product can be molded by the mold release sheet according to the present embodiment and the molding method of the glass molded product using the mold release sheet.
  • molding can be performed by a simple operation such as press molding, and the productivity of the molded product can be improved, so that the glass molded product as the final product can be stably molded at low cost.
  • the mold release sheet of the present invention and a method for molding a glass molded product using the release sheet can be widely used when molding a glass molded product by press molding.
  • it is useful for forming a glass housing having a free-form surface.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Abstract

La présente invention porte sur une feuille de démoulage et un procédé de moulage de verre apte à démouler doucement une matière en verre d'un moule et améliorer une productivité et une aptitude au traitement même lorsqu'un temps de chauffage a été prolongé. La présente invention porte également sur une feuille de démoulage (12) disposée entre une matière en verre (50) et un moule (11), qui est composé d'un moule supérieur (11a) et d'un moule inférieur (11b), lorsque la matière en verre (50) est à mouler par pression par le moule (11), la feuille de démoulage (12) étant caractérisée en ce que la perméabilité gazeuse mesurée à une pression différentielle de 0,05 Pa à l'aide d'air en tant que gaz d'essai est de 0,01 à 100 L/min•cm2.
PCT/JP2012/084054 2012-01-18 2012-12-28 Feuille de démoulage et procédé de moulage d'article moulé en verre Ceased WO2013108572A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012008087 2012-01-18
JP2012-008087 2012-01-18

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WO2013108572A1 true WO2013108572A1 (fr) 2013-07-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021080160A (ja) * 2014-10-29 2021-05-27 キングス メタル ファイバー テクノロジーズ カンパニー, リミテッドKing’S Metal Fiber Technologies Co., Ltd. コンピュータ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008015952A1 (fr) * 2006-07-31 2008-02-07 Toyo Tanso Co., Ltd. Feuille de démoulage
JP2010024084A (ja) * 2008-07-18 2010-02-04 Tosoh Quartz Corp 型材を用いた石英ガラス材料の成形方法
JP2010047444A (ja) * 2008-08-21 2010-03-04 Nikon Corp 石英ガラスの成形方法および成形装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008015952A1 (fr) * 2006-07-31 2008-02-07 Toyo Tanso Co., Ltd. Feuille de démoulage
JP2010024084A (ja) * 2008-07-18 2010-02-04 Tosoh Quartz Corp 型材を用いた石英ガラス材料の成形方法
JP2010047444A (ja) * 2008-08-21 2010-03-04 Nikon Corp 石英ガラスの成形方法および成形装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021080160A (ja) * 2014-10-29 2021-05-27 キングス メタル ファイバー テクノロジーズ カンパニー, リミテッドKing’S Metal Fiber Technologies Co., Ltd. コンピュータ

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