WO1998022402A1 - Procede de fabrication d'objets en verre moules en forme de boite - Google Patents

Procede de fabrication d'objets en verre moules en forme de boite Download PDF

Info

Publication number
WO1998022402A1
WO1998022402A1 PCT/JP1997/004237 JP9704237W WO9822402A1 WO 1998022402 A1 WO1998022402 A1 WO 1998022402A1 JP 9704237 W JP9704237 W JP 9704237W WO 9822402 A1 WO9822402 A1 WO 9822402A1
Authority
WO
WIPO (PCT)
Prior art keywords
glass
box
support
forming agent
shaped glass
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/JP1997/004237
Other languages
English (en)
Japanese (ja)
Inventor
Gen Kojima
Tsutomu Koyama
Hideki Kusthitani
Jeetendra Sehgal
Masaru Yoshitake
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
Original Assignee
Asahi Glass Co Ltd
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 Asahi Glass Co Ltd filed Critical Asahi Glass Co Ltd
Publication of WO1998022402A1 publication Critical patent/WO1998022402A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • C03B11/10—Construction of plunger or mould for making hollow or semi-hollow articles
    • 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
    • C03B40/04—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it using gas
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B9/00—Blowing glass; Production of hollow glass articles
    • C03B9/29—Paste mould machines
    • C03B9/292—Details of such machines

Definitions

  • the present invention relates to a method for forming a novel box-shaped glass molded article. Molding a box-shaped glass used BACKGROUND most widely, after dissolve in the melting furnace to a predetermined material, at a temperature at which the viscosity of the glass is about 1 0 4 to 1 0 6 Boyes, heated This is a so-called press forming method in which the material is introduced into a forming die and pressed.
  • An object of the present invention is to solve the above-mentioned drawbacks in the conventional method for forming a box-shaped glass molded product.
  • the present invention provides a step of preforming a glass heated to a temperature equal to or higher than the glass transition point into a box with a mold.
  • the present invention also provides a method for forming a box-shaped glass molded product, which comprises a step of sliding each other through a thin layer of a vapor film forming agent which has been continuously vaporized.
  • gas is continuously supplied to the interface between the glass and the support by vaporizing the vapor film forming agent.
  • This gas exists as a thin layer at the interface between the glass and the support.
  • a box-shaped glass molded product having a surface with good surface smoothness can be obtained without contamination of the surface with impurities.
  • the vapor film forming agent is supplied to the support as a liquid, continuous supply is easy, and the supply amount is small.
  • the vaporization of the vapor film forming agent may occur on the molding surface of the support or may occur near the molding surface in the support.
  • the box-shaped glass molded product which is an object of the present invention refers to a glass molded product in which at least a part of a cross section parallel to a surface to be formed smoothly is not a perfect circle, and a whole or a part of a horizontal cross section. Is typically rectangular, but may be diamonds, ellipses, ellipses, or other complex shapes, and the vertices may be acute or obtuse.
  • the shape of the surface in contact with the support via the vapor film may be any of a flat surface, a spherical surface, an aspherical surface, and a cylindrical surface.
  • FIG. 1 is a side sectional view showing an embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings.
  • FIGS. 1 (a) and 1 (b) show schematic process diagrams of a method for forming a box-shaped glass molded product. A predetermined weight of the molten glass heated in the glass melting furnace is dropped onto a molding die 11, and is preformed into a box-shaped glass 2 by pressing with a plunger 1.
  • the molding die 11 is formed by combining a side molding die 3 and a bottom molding die 4 in a removable state.
  • the side mold 3 and the bottom mold 4 may be supported independently.
  • the bottom mold 4 With the glass 2 preformed in a box shape kept at a temperature equal to or higher than the glass transition point, the bottom mold 4 is removed, and a porous hydrophilic carbon plate 6 (support) having an average pore size of 25 ⁇ is surfaced. It moves on the belt conveyor 7 arranged in.
  • the blow head 5 is brought into close contact with the upper part of the preformed box-shaped glass 2 and air is blown in as indicated by an arrow to apply an internal pressure to the box-shaped glass.
  • Water (steam film forming agent) is supplied from the supply device 9 into the carbon plate 6 at a position where the carbon plate 6 is not slid with the glass. That is, water is supplied into the carbon plate 6 through the atomizer 8. The supplied water is vaporized when the carbon plate 6 slides on the glass 2 preformed in a box shape, and water vapor is continuously generated at the interface between the box glass 2 and the carbon plate 6. Thus, a thin layer 10 of water vapor is formed at the interface between the box-shaped glass 2 and the carbon plate 6.
  • the glass 2 preformed into a box shape receives the applied internal pressure and the pressure via the water vapor from above and below, respectively, while sliding on a belt conveyor 7 having a carbon plate 6 disposed on the surface. This improves the surface smoothness.
  • the force on which the sliding surface of the support is one surface of the bottom surface of the box-shaped glass molded product is not limited to this.
  • the surface smoothness of any surface can be improved at the same time.
  • the present invention is not limited to this, and various types of organic and inorganic liquids at room temperature can be used.
  • the melting point is 40 ° C or less and the boiling point at atmospheric pressure
  • it is a stable non-flammable substance which does not decompose even at a temperature of 500 to 500 ° C, particularly 300 ° C or lower, and more than 200 ° C or higher.
  • the vaporized gas of the vapor film forming agent may be one that does not chemically react with glass to the extent that glass quality is impaired, or that returns to its original state even after temporary reaction, Nonflammable materials that are stable at temperature are preferred.
  • the vapor film forming agent that satisfies such demands one containing water as a main component as in the above embodiment is preferable.
  • a porous hydrophilic carbon plate was used as the support, it is not limited to this. That is, the support used in the present invention may be made of a material or a structure capable of containing a liquid therein, at least in the vicinity of the sliding surface with the glass.
  • porous structure capable of containing a liquid therein
  • the porous structure referred to here includes those in which the gaps in the fibrous structure are substantially pores.
  • the surface of the porous body preferably has fine pores having a diameter of 5 mm or less, particularly 1 mm or less, and more preferably 1 ⁇ m ⁇ or less. It is preferable that the material has a high affinity with the vapor film forming agent.
  • a material having a high affinity for the vapor film forming agent to be used and made of a material which can be wet or swelled by the vapor film forming agent and contain a sufficient amount of the vapor film forming agent inside can also be used. These materials are capable of occluding and releasing a sufficient amount of vapor film forming agent.
  • the support material include, for example, polymer materials derived from natural products such as cellulose, paper, wood, and bamboo; synthetic polymer materials such as polyols; and carbon-based materials. It can be suitably used as a material.
  • metal materials such as iron, stainless steel, and platinum, metal oxides such as aluminum oxide, zirconium oxide, silicon carbide, and silicon nitride, and ceramic materials mainly containing metal carbides and metal nitrides can also be used.
  • the molding surface of the support may have a smooth envelope surface, and may be very smooth except for the fine pores and fibrous irregularities, and may have a constant irregularity.
  • the support used in the present invention is processed into a plate shape, a belt shape, a roll shape, or the like, or is placed on a substrate having such a shape, and is heated through a continuously formed thin layer of gas. Slides with the glass to form any surface of the box-shaped glass. In the box-shaped glass that has been subjected to coarse molding in advance, the viscosity is lower than the temperature at which the glass exhibits a viscosity of 100 V.O. When placed in contact with a thin layer, the flatness of the plane can be improved, and it undergoes minute deformation such as wall thickness adjustment.
  • the glass has a viscosity that allows it to form a predetermined shape and a smooth surface by the force from the gas layer and its own surface tension, and that sufficient time is secured for it. is there. During that time, the contact with the gas layer may be continuous or intermittent. In addition, reheating can be performed if necessary during the process.
  • the support moves relative to the glass to constantly renew the surface that applies pressure to the glass. That is, the support and the glass slide with respect to each other via the thin layer of the vapor film forming agent.
  • the glass itself can be vibrated or rotated at a constant period while the support is placed on the belt conveyor and the belt conveyor is rotated.
  • an eccentric rotating motion as used in an Oscar polisher may be used.
  • the outer die for forming or maintaining the box-shaped part to have a predetermined shape has an end face on the bottom side with an appropriate distance from the surface of the support impregnated with the vapor film forming agent. It is important that they slide relatively. If this distance is too large, deformation near the periphery of the bottom surface and protrusion from the outer mold may increase. On the other hand, if the gap is not substantially present, direct contact between the outer mold and the surface of the support may occur, which may cause inconvenience such as abrasion.
  • the separation distance is preferably not more than 100 ⁇ , more preferably not more than 500 ⁇ , depending on the viscosity of the glass subjected to sliding.
  • the glass is gradually cooled to a temperature near the glass transition point while sliding on the support. Cooling can be performed while controlling the temperature and amount of the vapor film forming agent and air to be supplied, the speed of movement relative to the glass, the time, and the like. Also, the cooling step can be performed continuously or intermittently. Next, it enters a slow cooling kiln, etc., and is cooled to around room temperature to become a product.
  • Various methods can be employed for introducing the vapor film forming agent into the support. One method is to supply the support to a position where the support does not slide with the glass, as shown in Fig. 1.
  • the introduction can be performed, for example, by passing the liquid through a liquid introduction path on the back side of the support and passing the liquid under normal pressure or under pressure.
  • the supply of the vapor film forming agent into the support is based on the amount, type, shape, width, temperature, etc. of the heated glass to be molded, as well as environmental factors such as ambient temperature and humidity, and various other factors. It is important that the setting be made in accordance with
  • all the above-mentioned process and condition settings can be computer-controlled as necessary, and it is desirable to do so. For example, by detecting the temperature, shape, smoothness, etc. of the glass being manufactured, controlling the amount of gas generated by the amount of liquid supplied, pressure, temperature, etc., the speed of movement of the support, the pattern, the glass By optimizing the moving speed, etc. by the combination control, it is possible to manufacture high-quality box-shaped glass molded products.
  • the present invention provides a technology that can be replaced with a method of polishing after press molding, which is a typical production method of box-shaped glass molded products that are currently widely used industrially.
  • Industrial Applicability The production method of the present invention has the following effects.
  • Job change can be performed quickly and multi-product production can be easily performed.

Landscapes

  • 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

Un procédé de fabrication d'objets en verre moulés en forme de boîte comprend les étapes suivantes: on préforme du verre jusqu'à une température supérieure ou égale au point de transition vitreuse sous forme de boîte au moyen d'un moule; on réalise un support dans une matière ou une structure contenant à l'intérieur un agent filmogène vapeur qui n'est pas gazeux au moins dans des conditions de température ambiante mais qui est effectivement gazeux à une température égale ou supérieure au point de transition vitreuse; puis on fait glisser le support et le verre qui sont à une température égale ou supérieure au point de transition vitreuse l'un vers l'autre à travers une couche mince d'agent filmogène vapeur qui s'évapore en continu à proximité d'une interface située entre le support et le verre.
PCT/JP1997/004237 1996-11-20 1997-11-20 Procede de fabrication d'objets en verre moules en forme de boite Ceased WO1998022402A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8/309534 1996-11-20
JP30953496 1996-11-20

Publications (1)

Publication Number Publication Date
WO1998022402A1 true WO1998022402A1 (fr) 1998-05-28

Family

ID=17994181

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1997/004237 Ceased WO1998022402A1 (fr) 1996-11-20 1997-11-20 Procede de fabrication d'objets en verre moules en forme de boite

Country Status (1)

Country Link
WO (1) WO1998022402A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7401477B2 (en) 2002-10-11 2008-07-22 Asahi Glass Comapny, Limited Method for bending a glass sheet
JP2012528555A (ja) * 2009-05-27 2012-11-12 デーエステー ダウアーマグネート―ズュステームテヒニーク ゲゼルシャフト ミット ベシュレンクテル ハフツング 電磁継手、並びに電磁継手のための分割型ケース

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52129717A (en) * 1976-04-24 1977-10-31 Tokyo Shibaura Electric Co Apparatus for molding glass articles
JPH0616439A (ja) * 1992-02-12 1994-01-25 Tamglass Oy 平坦ガラス焼戻し機用ノズル集合体

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52129717A (en) * 1976-04-24 1977-10-31 Tokyo Shibaura Electric Co Apparatus for molding glass articles
JPH0616439A (ja) * 1992-02-12 1994-01-25 Tamglass Oy 平坦ガラス焼戻し機用ノズル集合体

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7401477B2 (en) 2002-10-11 2008-07-22 Asahi Glass Comapny, Limited Method for bending a glass sheet
JP2012528555A (ja) * 2009-05-27 2012-11-12 デーエステー ダウアーマグネート―ズュステームテヒニーク ゲゼルシャフト ミット ベシュレンクテル ハフツング 電磁継手、並びに電磁継手のための分割型ケース

Similar Documents

Publication Publication Date Title
EP0884283B1 (fr) Processus de formation de verre plat
KR100390637B1 (ko) 글래스 기판 성형용 금형, 글래스 기판 성형용 글래스소재, 글래스 기판의 제조방법 및 자기 디스크용 글래스기판
US6009725A (en) Process for manufacturing glass optical elements
WO2007083532A1 (fr) Procede de fabrication de verre faconne
US7213414B2 (en) Process for producing flat glass
JPH08259242A (ja) ガラス素材の浮上軟化方法、光学素子の製造方法、および光学素子
JP4178444B2 (ja) 薄板ガラスの製造装置及び製造方法
JP3948044B2 (ja) ガラス板の成形方法
WO1998022402A1 (fr) Procede de fabrication d'objets en verre moules en forme de boite
KR20030066313A (ko) 고순도 마모 인서트용 재료 및 이의 제조
US20120272683A1 (en) Method and apparatus for shaping the floor of a glass vessel
US4286981A (en) Mould with separating layer for the production of glass objects
JPWO1998022402A1 (ja) 箱型ガラス成形品の成形法
JP2000154027A (ja) 光学ガラスの成形装置
JP3712575B2 (ja) ガラスゴブの製造方法及び製造装置
Zhang et al. Amorphous carbon coated silicon wafer as mold insert for precision glass molding
US7174745B2 (en) Apparatus for press-forming molten bodies
JP3634898B2 (ja) ガラス光学素子成形用予備成形体の製造方法及びその装置
JP2790547B2 (ja) ガラス素材製造方法
JP2000233934A (ja) ガラス製品のプレス成形方法及び装置
JP4560909B2 (ja) 幅広板硝子の連続製法
JP2001180950A (ja) 連続薄肉板硝子の改良製法
JP2002193630A (ja) 幅広板硝子の製造法改良
JPH06144849A (ja) 光学素子の成形装置、その製造方法及び光学素子の成形方法
US637899A (en) Manufacture of glass articles.

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CN JP KR US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase