WO2014112485A1 - Procédé de fabrication de corps moulé et procédé de fabrication de corps moulé en verre - Google Patents

Procédé de fabrication de corps moulé et procédé de fabrication de corps moulé en verre Download PDF

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Publication number
WO2014112485A1
WO2014112485A1 PCT/JP2014/050469 JP2014050469W WO2014112485A1 WO 2014112485 A1 WO2014112485 A1 WO 2014112485A1 JP 2014050469 W JP2014050469 W JP 2014050469W WO 2014112485 A1 WO2014112485 A1 WO 2014112485A1
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WO
WIPO (PCT)
Prior art keywords
glass
mold
molten
molded body
molten glass
Prior art date
Application number
PCT/JP2014/050469
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English (en)
Japanese (ja)
Inventor
伊賀　元一
正徳 中野
Original Assignee
旭硝子株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 旭硝子株式会社 filed Critical 旭硝子株式会社
Priority to JP2014557463A priority Critical patent/JP6075392B2/ja
Publication of WO2014112485A1 publication Critical patent/WO2014112485A1/fr

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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
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B13/00—Rolling molten glass, i.e. where the molten glass is shaped by rolling
    • C03B13/08—Rolling patterned sheets, e.g. sheets having a surface pattern
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • C03B17/065—Forming profiled, patterned or corrugated sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B18/00—Shaping glass in contact with the surface of a liquid
    • C03B18/02—Forming sheets
    • C03B18/04—Changing or regulating the dimensions of the molten glass ribbon
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B18/00—Shaping glass in contact with the surface of a liquid
    • C03B18/02—Forming sheets
    • C03B18/14—Changing the surface of the glass ribbon, e.g. roughening
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/02—Re-forming glass sheets
    • C03B23/023—Re-forming glass sheets by bending
    • C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
    • C03B23/033—Re-forming glass sheets by bending by press-bending between shaping moulds in a continuous way, e.g. roll forming, or press-roll bending

Definitions

  • the present invention relates to a method for producing a molded body and a method for producing a glass molded body.
  • a chemically strengthened glass is attached as a cover glass on the front surface of the display device, and has a function of improving design as well as a function of protecting a liquid crystal display (LCD).
  • a flat plate glass has been used so far.
  • a part of the flat plate glass for example, an outer edge portion surrounding a flat portion is bent into a curved shape to cover the cover glass.
  • the glass may be molded so as to form a part of the housing.
  • press forming As a method for forming a sheet glass, press forming is generally known.
  • a sheet glass heated to near the softening point in a heating furnace is transferred to a forming part between an upper mold and a lower mold in a horizontal state by a conveying roller, and is bent between the upper mold and the lower mold.
  • a molding apparatus for molding is disclosed.
  • an object of the present invention is to provide a method for producing a molded body and a method for producing a glass molded body, which produce a molded body that is not affected by the surface shape of the mold.
  • the present invention provides the following aspects. (1) A molten substance having a specific gravity lower than that of a liquid substance is floated on the liquid substance, a mold having a non-contact portion surrounded by a contact portion that contacts the molten substance is pressed against the molten substance, and the molten substance is cooled. To obtain a molded body. (2) A glass molded body is formed by pressing a mold having a non-contact portion surrounded by a contact portion in contact with the molten glass against the molten glass floated on the molten metal, and cooling the molten glass. The manufacturing method of the glass forming body characterized by obtaining.
  • a mold having a hollow portion surrounded by a contact portion in contact with the molten glass is pressed against the molten glass, and the molten glass is cooled to obtain a glass molded body.
  • a method for producing a glass molded body characterized by being obtained.
  • a molten mold floated on the molten metal is pressed against the molten glass so that the sidewall is in contact with the molten glass with an opening surrounded by the side wall at one end and the other end closed.
  • a method for producing a glass molded body comprising obtaining a glass molded body by cooling the molten glass.
  • a method for producing a glass molded body comprising: a molding step of floating molten glass on a molten metal to mold a glass ribbon; and a slow cooling step of gradually cooling the glass ribbon,
  • a method for producing a glass molded body characterized in that, in the molding step, a molded glass ribbon is obtained by pressing a mold having a hollow portion surrounded by a contact portion in contact with the molten glass against the molten glass.
  • a method for producing a glass molded body comprising: a molding step of floating molten glass on a molten metal to form a glass ribbon; and a slow cooling step of gradually cooling the glass ribbon,
  • a molded glass ribbon is formed by pressing a mold having an opening surrounded by a side wall on one end side and closing the other end side against the molten glass so that the side wall is in contact with the molten glass.
  • a method for producing a glass molded body characterized by being obtained.
  • the bottom surface of the molten material is in contact with the liquid material, and the top surface is exposed to the molding atmosphere corresponding to the non-contact portion of the mold,
  • the part used as a product does not contact the mold on both sides. Therefore, a molded body having a smooth surface shape can be obtained without being affected by the surface shapes of the upper die and the lower die. Further, maintenance of the upper mold and the lower mold is not required, surface treatment of the molded body after press molding can be omitted, productivity is high, and manufacturing cost can be reduced.
  • the bottom surface of the molten glass is in contact with the molten metal, and the top surface is in the non-contact portion, hollow portion or opening of the mold.
  • the part used as a product does not contact the mold on both sides. Therefore, a glass molded body having a smooth surface shape can be obtained without being influenced by the surface shapes of the upper die and the lower die. Further, maintenance of the upper mold and the lower mold is unnecessary, and the surface treatment of the glass molded body after press molding can be omitted, so that the productivity is high and the manufacturing cost can be reduced.
  • 1 (a) to 1 (e) are explanatory views for explaining each step of a method for producing a glass molded body according to an embodiment of the present invention.
  • 2 (A) and 2 (B) are explanatory views for explaining each step of the method for producing a glass molded body according to one embodiment of the present invention.
  • It is a perspective view of the hollow type which is one embodiment of a type.
  • It is a schematic diagram which shows typically the press apparatus provided in the float bath of the glass manufacturing apparatus.
  • FIG. 5 is a sectional view taken along line AA in FIG. 4. It is a figure which shows the photograph of the glass molded object manufactured in the Example.
  • FIG. 1 is an explanatory view explaining each process of a manufacturing method of a glass fabrication object of one embodiment of the present invention, and (a) is a figure showing the state where molten glass was floated on the molten metal in a molten metal bath.
  • (B) is a figure which shows the state which has arrange
  • (c) is a figure which shows the state which pressed the hollow type
  • (d) is glass deform
  • (e) is a figure which shows the state which took out only the hollow type
  • a molten metal bath 10 in a heating device capable of temperature control is heated, and a molten glass 20 (hereinafter referred to as molten glass) is formed on a molten metal 11 such as molten tin. Also called).
  • the temperature in the molten metal bath is set near the softening point, for example, 800 ° C.
  • the hollow mold 12 is disposed on the molten glass 20 on the molten metal 11.
  • the hollow mold 12 is made of a material having heat resistance at a molding temperature, for example, metal, ceramic, carbon or the like.
  • a cylindrical hollow mold shown in FIG. 3 will be described as an example.
  • the hollow mold 12 has a hollow portion 12b in which the inside of the annular portion 12a that is in contact with the molten glass 20 is hollowed in a columnar shape, and a region other than the annular portion 12a is formed before and after the deformation of the molten glass 20 in the molten glass 20. It is configured not to come into contact with.
  • the shape of the hollow portion 12b is determined so as to correspond to the shape of the glass to be formed, such as a circular shape, an elliptical shape, a triangular shape, and a rectangular shape, and a glass portion corresponding to the hollow portion 12b (described below).
  • the forming region 21 and the boundary region 23) constitute the glass molded body 25 as a product.
  • the hollow mold 12 on the molten glass 20 is pressed downward toward the molten metal 11.
  • the molten glass 20 is pressed into the molten metal 11 by pressing so that the upper surface of the molten glass 20 is not buried in the molten metal 11.
  • the pressing force is set according to the thickness and viscosity of the molten glass, and the shape of the glass molded body to be molded, and the weight of the hollow mold 12 may be appropriately set so as to be pressed by its own weight. In addition to the weight of the mold 12, a pressing force may be applied.
  • the black arrow indicates the buoyancy acting on the lower surface of the molten glass 20 according to the depth of the molten glass 20.
  • the temperature in the molten metal bath is lowered from 800 ° C. to 600 ° C., for example.
  • the viscosity of the molten glass 20 at this time is preferably in the range of 10 7 to 10 9 Pa ⁇ s.
  • the molten glass 20 is shaped by buoyancy acting on the lower surface of the molten glass 20 corresponding to the hollow portion 12b of the hollow mold 12 as shown in FIG.
  • the glass located outside the region 21 and the annular portion 12a is deformed so as to protrude upward.
  • the boundary region 23 between the contact region 22 corresponding to the annular portion 12a of the hollow mold 12 and the molding region 21 is curved in a convex shape, and the molding region 21 corresponding to the center of the hollow portion 12b becomes flat.
  • the curved shape of the boundary region 23 differs depending on the glass viscosity and the plate thickness. For example, when the glass viscosity is low and the glass plate is thin, the boundary region 23 is formed in the annular portion 12a. When the glass is highly viscous and the glass is thick, the boundary region 23 is gently curved along the annular portion 12a.
  • type 12 becomes hollow by taking out the hollow type
  • the hollow mold 12 can take out the glass molded body 25 together with the hollow mold 12 by increasing the surface roughness of the annular portion 12 a and increasing the contact area with the molten glass 20. After the glass molded body 25 is cooled, the contact area 22 is cut out to have a final shape.
  • the glass molded body 25 may be subjected to a chemical strengthening treatment after molding.
  • the chemical strengthening is performed, for example, by immersing the glass in a potassium nitrate (KNO 3 ) molten salt at 380 ° C. to 450 ° C. for 0.1 to 20 hours.
  • the temperature of the potassium nitrate (KNO 3 ) molten salt, the immersion time, the melting By changing the salt or the like, the way of chemical strengthening can be adjusted.
  • a compressive stress layer is formed on the glass surface, and a tensile stress layer is formed inside.
  • the glass molded body 25 thus manufactured has a bottom surface that is in contact with the molten metal 11 and a top surface that is exposed to a molding atmosphere corresponding to the hollow portion 12b of the hollow mold 12, and is used as a product.
  • a certain molding region 21 and boundary region 23 are not in contact with the hollow mold 12 on both sides. Therefore, unlike the prior art, a glass molded body 25 having a smooth surface shape can be obtained without being affected by the surface shapes of the upper mold and the lower mold.
  • the maintenance of the upper mold and the lower mold, which has been conventionally performed, is unnecessary, the surface treatment of the glass molded body after press molding can be omitted, and the productivity is high and the manufacturing cost can be reduced.
  • the molding speed and the indentation speed of the glass molding described in the above embodiment it can be greatly deformed in the height direction.
  • the hollow mold 12 is slowly and gradually pushed down so that the molten metal 11 does not enter from the edge of the deformed molten glass 20 (FIG. 2 (B) ( d2)), a glass molded body 25 having a higher height can be formed. Since the weight of the molten metal 11 sunk by the hollow mold 12 is equal to the reaction force acting on the hollow mold 12 and this reaction force becomes the molding pressure, the area of the molten glass 20 is made sufficiently large. It is suppressed that the molten glass 20 whole is pushed down by putting. Since the molding speed of high-viscosity glass is slow, the higher the viscosity, the slower the push-down speed.
  • the molten glass 20 used for manufacturing the glass molded body 25 may be heated again to a molten state by heating a glass plate manufactured by a manufacturing method such as a float method or a fusion method, or melted by melting a glass raw material. Glass may be used. Moreover, it can also shape
  • soda lime glass As the glass 20, soda lime glass, aluminosilicate glass, or the like can be used.
  • aluminosilicate glass for example, a glass having the following composition is used.
  • the K 2 O containing 0-10% Until 10% not essential K 2 O is a, and an object may include a range that does not impair the present invention, in the meaning of is there.
  • the composition expressed in mol% is SiO 2 50-74%, Al 2 O 3 1-10%, Na 2 O 6-14%, K 2 O 3-11%, MgO 2 -15%, CaO 0-6% and ZrO 2 0-5%, the total content of SiO 2 and Al 2 O 3 is 75% or less, the total content of Na 2 O and K 2 O Is 12 to 25%, and the total content of MgO and CaO is 7 to 15%.
  • the composition expressed in mol% is SiO 2 68-80%, Al 2 O 3 4-10%, Na 2 O 5-15%, K 2 O 0-1%, MgO 4 to 15% and a ZrO 2 0 - 1% glass containing.
  • composition expressed in mol% is SiO 2 67-75%, Al 2 O 3 0-4%, Na 2 O 7-15%, K 2 O 1-9%, MgO 6 -14% and ZrO 2 0-1.5%, the total content of SiO 2 and Al 2 O 3 is 71-75%, the total content of Na 2 O and K 2 O is 12-20 %, And when it contains CaO, its content is less than 1%.
  • the glass 20 preferably has a thickness of 1.5 mm or less, more preferably 0.3 to 1.1 mm.
  • the glass manufacturing apparatus 30 includes a melting furnace (not shown) for melting a glass raw material, a float bath 31 that floats the molten glass on molten tin to form a flat glass ribbon G, and a glass ribbon G. And a slow cooling furnace 33 that gradually cools the glass ribbon G by gradually lowering the temperature of the glass ribbon G after being drawn out from the float bath 31.
  • a pressing device 40 is provided in the float bath 31 in which molten tin is provided.
  • an electric heater H supplies an amount of heat whose output is controlled to a necessary position in the float bath 31, and a desired size and thickness are obtained while slowly cooling the glass ribbon G being conveyed. And then discharged to the slow cooling furnace 33.
  • the pressing device 40 is disposed so as to face the top surface of the glass ribbon G in a region where the viscosity of the glass in the float bath 31 is in a range of 10 7 to 10 9 Pa ⁇ s.
  • at least two support shafts 42 extending from the side wall 31a of the float bath 31 are rotatably arranged at a predetermined interval on the upstream side and the downstream side.
  • a plurality of pressing dies 45 in which a plurality of hollow portions 44 formed by lattice-like contact portions are arranged in the width direction and the conveyance direction are provided on the wound endless belt 43.
  • the endless belt 43 is rotated by the rotation of the two support shafts 42, the pressing mold 45 presses the molten glass with a predetermined pressing force, and the molten glass is conveyed.
  • the pressing mold 45 moves, the molten glass is cooled while being pressed.
  • the contact region 22 corresponding to the annular portion 12a of the hollow mold 12 and the boundary region 23 between the forming regions 21 are curved in a convex shape, and the forming region 21 corresponding to the center of the hollow portion 12b has a flat glass ribbon G.
  • a plurality of glass molded bodies 25 are obtained by cutting the glass ribbon G obtained and discharged from the slow cooling furnace 33.
  • the transport roller 34 that transports the glass ribbon G does not contact the molding region 21 and the boundary region 23, and transports the product.
  • the roller 34 can be configured at a low cost, and a net-shaped conveying member can be used instead of the roll.
  • soda lime glass having a length of about 30 mm, a width of about 60 mm, and a plate thickness of about 0.7 mm was prepared and placed on the molten tin in a molten metal bath in which molten tin was prepared.
  • the temperature in the molten metal bath at this time was about 800 ° C.
  • a cylindrical hollow mold made of carbon shown in FIG. 3 was prepared. This hollow mold had an inner diameter of about 40 mm, an outer diameter of about 50 mm, and a weight of about 22 g.
  • this hollow mold is pressed against soda lime glass placed on molten tin, cooled to about 600 ° C. at a cooling rate of about 20 ° C./min, and when it reaches about 600 ° C., The hollow mold and soda lime glass were taken out.
  • FIG. 6 is a view showing a photograph of the obtained glass molded body.
  • the glass molded body can be formed into a shape in which the forming region corresponding to the hollow portion of the hollow mold is flat and the boundary region between the contact region and the forming region is curved, and the forming region and the boundary region can be formed. It could be formed without contacting the hollow mold.
  • the hollow portion 12b surrounded by the annular portion 12a contacting the molten glass 20 with respect to the molten glass 20 floated on the molten metal. Since the glass mold 25 is obtained by pressing the hollow mold 12 having a temperature and cooling the molten glass 20, the bottom surface of the molten glass 20 to be the glass mold 25 is in contact with the molten metal 11, and the top surface is hollow. The mold 12 is exposed to a molding atmosphere corresponding to the hollow portion 12 b of the mold 12, and the molding area 21 and the boundary area 23 that are used parts of the product do not contact the hollow mold 12 on both sides.
  • the glass molded body 25 having a smooth surface shape can be obtained without being affected by the surface shapes of the upper die and the lower die. Further, maintenance of the upper mold and the lower mold is unnecessary, and the surface treatment of the glass molded body 25 after press molding can be omitted, so that the productivity is high and the manufacturing cost can be reduced.
  • the portion corresponding to the center of the hollow portion 12b of the hollow mold 12 is flattened. Meanwhile, a curved glass having a desired curvature can be formed at the outer edge of the hollow portion.
  • the shape of the glass molded body can be adjusted by applying a hollow self weight or a pressing force in addition to the self weight.
  • a hollow mold is illustrated as a mold, but the mold is not limited to this as long as the mold has a non-contact portion surrounded by a contact portion that contacts the molten glass.
  • a bottomed mold 13 having an opening 13a on one end side and closed on the other end side may be used.
  • the illustrated bottomed mold 13 has a substantially rectangular opening 13a on one end side, the other end side is closed by a bottom surface 13b, and the opening 13a side of the side wall 13c that defines and forms the opening 13a.
  • the bottom surface of the molten glass 20 to be the glass molded body 25 is in contact with the molten metal 11, and the top surface is exposed to the molding atmosphere corresponding to the space portion of the bottomed mold 13. It is.
  • the bottom surface 13 b is set to a height that does not contact the molten glass 20.
  • the bottom surface 13b may be provided with a communication hole that communicates the inside and the outside.
  • molded objects such as resin and rubber
  • the molten material having a specific gravity higher than that of the molten material such as resin or rubber is floated on the liquid material, and the hollow mold is pressed against the molten material to be cooled.
  • a molded body can be obtained.
  • both the liquid substance and the molten substance are common in that they are liquids, and the terms liquid substance and molten substance are appropriately used depending on the specific gravity.
  • molten tin with a large specific gravity is a liquid material
  • molten soda lime silica glass with a small specific gravity is a molten material.
  • the uses such as the glass manufactured in the above embodiment are not limited to the cover glass of the display device, but can be applied to all uses such as an automobile windshield.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Glass Compositions (AREA)
  • Surface Treatment Of Glass (AREA)

Abstract

L'invention concerne un corps moulé en verre qui est obtenu par pressage d'un moule comprenant une partie sans contact qui est entourée par une partie de contact qui met en contact le verre fondu contre le verre fondu flottant sur un métal fondu et par refroidissement du verre fondu.
PCT/JP2014/050469 2013-01-17 2014-01-14 Procédé de fabrication de corps moulé et procédé de fabrication de corps moulé en verre WO2014112485A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2014557463A JP6075392B2 (ja) 2013-01-17 2014-01-14 成形体の製造方法及びガラス成形体の製造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013-006504 2013-01-17
JP2013006504 2013-01-17

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WO2014112485A1 true WO2014112485A1 (fr) 2014-07-24

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PCT/JP2014/050469 WO2014112485A1 (fr) 2013-01-17 2014-01-14 Procédé de fabrication de corps moulé et procédé de fabrication de corps moulé en verre

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JP (1) JP6075392B2 (fr)
TW (1) TW201437157A (fr)
WO (1) WO2014112485A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4043364A3 (fr) * 2017-08-03 2022-10-19 Agc Inc. Récipient destiné à contenir un liquide et méthode l'utilisant

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5899127A (ja) * 1981-12-09 1983-06-13 Nippon Sheet Glass Co Ltd ガラス板の成形方法
JPS58223621A (ja) * 1982-06-17 1983-12-26 Nippon Sheet Glass Co Ltd 高温の液体浴上でガラス板を成形する方法
JPS63211363A (ja) * 1987-02-23 1988-09-02 難波プレス工業株式会社 熱可塑性布の成形方法
JPH04506053A (ja) * 1989-05-24 1992-10-22 ジャガー　カーズ　リミテッド 熱可塑性薄板材料の成形

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5899127A (ja) * 1981-12-09 1983-06-13 Nippon Sheet Glass Co Ltd ガラス板の成形方法
JPS58223621A (ja) * 1982-06-17 1983-12-26 Nippon Sheet Glass Co Ltd 高温の液体浴上でガラス板を成形する方法
JPS63211363A (ja) * 1987-02-23 1988-09-02 難波プレス工業株式会社 熱可塑性布の成形方法
JPH04506053A (ja) * 1989-05-24 1992-10-22 ジャガー　カーズ　リミテッド 熱可塑性薄板材料の成形

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TW201437157A (zh) 2014-10-01
JPWO2014112485A1 (ja) 2017-01-19

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