EP0605519A1 - Procede de cintrage et de trempe de feuilles de verre - Google Patents

Procede de cintrage et de trempe de feuilles de verre

Info

Publication number
EP0605519A1
EP0605519A1 EP92919831A EP92919831A EP0605519A1 EP 0605519 A1 EP0605519 A1 EP 0605519A1 EP 92919831 A EP92919831 A EP 92919831A EP 92919831 A EP92919831 A EP 92919831A EP 0605519 A1 EP0605519 A1 EP 0605519A1
Authority
EP
European Patent Office
Prior art keywords
bending
glass
mould
glass sheet
sheet
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
EP92919831A
Other languages
German (de)
English (en)
Inventor
Tapio Laakso
Esko Lehto
Jukka Vehmas
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.)
Tamglass Engineering Oy
Original Assignee
Tamglass Engineering Oy
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 Tamglass Engineering Oy filed Critical Tamglass Engineering Oy
Publication of EP0605519A1 publication Critical patent/EP0605519A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • C03B23/025—Re-forming glass sheets by bending by gravity
    • C03B23/0258—Gravity bending involving applying local or additional heating, cooling or insulating means
    • 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
    • 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
    • C03B23/0302—Re-forming glass sheets by bending by press-bending between shaping moulds between opposing full-face shaping moulds
    • 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
    • C03B23/035—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending
    • C03B23/0352—Re-forming glass sheets by bending using a gas cushion or by changing gas pressure, e.g. by applying vacuum or blowing for supporting the glass while bending by suction or blowing out for providing the deformation force to bend the glass sheet
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B27/00—Tempering or quenching glass products
    • C03B27/012—Tempering or quenching glass products by heat treatment, e.g. for crystallisation; Heat treatment of glass products before tempering by cooling
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B29/00—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
    • C03B29/04—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way
    • C03B29/06—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way with horizontal displacement of the products
    • C03B29/08—Glass sheets

Definitions

  • the present invention relates to a method for bending and tempering glass sheets, particularly automotive backlight and side windows, wherein a glass sheet supported by a ring mould is heated to a bending temperature and the glass sheet is allowed to bend gravitational ly close to a correct bending shape.
  • the increase of temperatur after a bending operation involves the problem of how to retain a desired bending shape while one surface of a glass sheet is free for applying the heating effect to a glass sheet.
  • a problem is the positioning of a glass sheet between the transfers. This positioning problem does not occur if a glass sheet is already positioned prior to a heating operation directly onto a ring mould.
  • An object of the invention is to provide a method for bending and tempering glass sheets in a manner that the bent shape of a glass sheet can be retained and controlled even as the temperature of a bent glass sheet is equalized and if necessary heated to a sufficient temperature for tempering.
  • a glass sheet is placed and simultaneously properly positioned upon a ring mould 6 in a loading station, located at the inlet end of an upper conveyor track 1.
  • Moulds 6 are carried in wagons 3 whose front walls 4 separate successive preheating stations 5 from each other. Between the stations there may also be a gate, which is opened and closed. Wagons 3, 4 are advanced by one wagon length at a time on track 1.
  • a piece of glass 7 placed upon ring mould 6 is sequentially carried through preheating and pre-bending stations 5.
  • the glass is heated with electric resistances and possibly also by blasting hot air to the top and bottom surfaces of said glass.
  • the hot air is aspirated through openings 12 included in the lower furnace section and blasted into stations 5 through orifices 13. If necessary, it is possible to employ heaters for heating the blasting air.
  • a glass sheet 7 is heated with electric resistance elements 14 to a temperature sufficient for achieving gravitational pre-bending close to a final bending shape.
  • the glass is carried into a bending station 17 located at the outlet end of a furnace, wherein a glass sheet supported by ring mould 6 is approached by an overhead full-face mould 15, the shape of whose surface 1 substantially corresponds to a desired final bending shape. It is possibly necessary to anticipate the bendin occurring during transfers and, thus, the surface shape o mould 15 is slightly "short".
  • Mould 15 is double- channeled in a manner that the orifices in its surface ca be simultaneously used for blasting and aspiration.
  • Wagon 3, along with its ring mould 6, is lowered down by means of a hoist 10 and it returns along track 2 through the bottom of a furnace to the inlet end into the loading station by lifting it there by means of a hoist 11.
  • wagon 3, along with its mould 6, be first carried backwards in its traveling direction and only then lowered down.
  • a bent glass sheet can be heated from below by means of fixed heating elements while the glass sheet is supported by the overhead full-face mould 15. Another possibility is to effect the equalization of temperature exclusively by means of air circulated through the mould.
  • the full mould 15 is ceramic and the shape of its surface 16 corresponds substantially to the final bending shape of glass 7. Inside the full mould there is a double manifold, opening to surface 16 with nozzle orifices for producing on the glass surface both vacuum and blasting. When a glass sheet is retained as supported by full mould 15 with a negative pressure, the glass reaches and retains precisely its final shape. With the most complicated shapes, wherein the vacuum of overhead full mould 15 is not sufficient to achieve a final shape, a further pressing is effected from below by means of a lower partial or full-face mould or by means of a combination of a frame piece and its associated press, whereby the outermost edge of glass is pressed against overhead full mould 15.
  • the purpose of blasting is to equalize temperature differences in glass and to heat it to a tempering temperature.
  • the heat tempering can also be effected by using hot air blasted through the blasting orifices of mould 15. It is also possible to employ to such heating devices which can be shifted aside from below said mould 15, so that a glass sheet 7 can be lifted and lowered by means o a vertically movable mould.
  • a station 17 can be provided with horizontal' guides 9 that can also be use for manipulating a special tempering frame 8' between station 17 and an external tempering station.
  • the heating devices have been shifted onto the side of statio 17, either said tempering frame 8' along guides 9 or said tempering frame 8 along track 1 is brought to a position below said mould 15.
  • a heated piece of glass 7 is shifted from full mould 15 onto tempering frame 8 ' or 8 brought therebelow.
  • the temperin frame 8' can be intended e.g. for side windows and the tempering frame 8 for backlights.
  • the tempering frame 8 is used to carry the glass quickly to a chiller 19.
  • the tempered piece of glass is lifted from tempering frame 8 by means of an overhead pick-up 20 onto a roll conveyor 22, from which the glass travels through an after-cooler 21 to an unloading station 23.
  • a stationary mould 15 can be adapted to approach the glass by lifting said wagon 3 by means of hoist 10. It is also possible that heat tempering is effected in a heat- temperi ' ng station arranged between stations 17 and 19, whereby said mould 15 must be made horizontally movable between bending station 17 and the heat-tempering station. In this case, as well, the heating elements (e.g. lower resistances) can be stationary in position. If the heat tempering is' only effected by the hot-air blasting of mould 15, no separate heat-tempering station or movable heating elements are required.

Landscapes

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

Abstract

L'invention se rapporte à un procédé de cintrage et de trempe de feuilles de verre, en particulier pour des glaces arrière et latérales d'automobile. Une feuille de verre, soutenue par un moule annulaire, est chauffée et cintrée par effet de gravité de façon à se rapprocher de sa forme correcte. Dans un poste de cintrage (17), la feuille de verre est pressée pour prendre sa forme définitive au moyen d'un moule suspendu à face pleine, n'entrant pas en contact avec la feuille, et pourvu de deux canaux destinés au soufflage et à l'aspiration. Le vide produit dans un moule (15) est utilisé pour soulever une feuille de verre cintrée à partir du moule annulaire (6), et la feuille de verre est chauffée afin d'égaliser les différences de température et d'augmenter la température à une température de trempe. Une structure de trempe (8) est amenée sous la feuille de verre, celle-ci étant alors abaissée à partir du moule à face pleine jusqu'à la structure, laquelle est utilisée pour transporter le verre au poste de trempe.
EP92919831A 1991-09-27 1992-09-25 Procede de cintrage et de trempe de feuilles de verre Ceased EP0605519A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI914550 1991-09-27
FI914550A FI89038C (fi) 1991-09-27 1991-09-27 Foerfarande foer boejning och haerdning av bilars foenster
PCT/FI1992/000257 WO1993006052A1 (fr) 1991-09-27 1992-09-25 Procede de cintrage et de trempe de feuilles de verre

Publications (1)

Publication Number Publication Date
EP0605519A1 true EP0605519A1 (fr) 1994-07-13

Family

ID=8533194

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92919831A Ceased EP0605519A1 (fr) 1991-09-27 1992-09-25 Procede de cintrage et de trempe de feuilles de verre

Country Status (4)

Country Link
EP (1) EP0605519A1 (fr)
JP (1) JPH06510736A (fr)
FI (1) FI89038C (fr)
WO (1) WO1993006052A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2707283B1 (fr) * 1993-07-09 1995-09-22 Saint Gobain Vitrage Int Procédé et dispositif de formage de plaques de verre et application de ce procédé à l'obtention de vitrages de formes complexes.
US5735923A (en) * 1993-07-30 1998-04-07 Asahi Glass Company Ltd. Method of and apparatus for cooling and tempering a glass plate
US5669952A (en) * 1994-10-14 1997-09-23 Ppg Industries, Inc. Pressure forming of glass sheets
FI96764C (fi) 1995-01-10 1996-08-26 Tamglass Eng Oy Menetelmä karkaistavien tai lämpölujitettavien lasilevyjen lämmittämiseksi
EP0761613B1 (fr) * 1995-09-07 2001-10-24 Ford Motor Company Procédé de chauffage et de formage d'une feuille de verre
DE69608747T2 (de) * 1995-09-07 2000-10-12 Ford Motor Co Verfahren zum Erhitzen, Formen und Härten einer Glasscheibe
EP0761612B1 (fr) * 1995-09-07 2000-06-07 Ford Motor Company Procédé de chauffage d'une feuille de verre
WO1998045214A1 (fr) * 1997-04-04 1998-10-15 Asahi Glass Company Ltd. Procede et appareil de bombage de plaques de verre
US6240746B1 (en) * 1997-04-04 2001-06-05 Asahi Glass Company Ltd. Glass plate bending method and apparatus
FI109199B (fi) 2001-02-28 2002-06-14 Tamglass Ltd Oy Laite lasilevyjen taivuttamiseksi
FI116726B (fi) * 2002-06-12 2006-02-15 Tamglass Ltd Oy Laite lasilevyjen taivuttamiseksi
DE102005001513B3 (de) * 2005-01-13 2006-06-01 Saint-Gobain Sekurit Deutschland Gmbh & Co. Kg Vorrichtung und Verfahren zum Biegen von Glasscheiben
WO2012118612A1 (fr) * 2011-02-28 2012-09-07 Corning Incorporated Procédé de fabrication d'article en verre en trois dimensions à partir de feuille de verre en deux dimensions
US20160145139A1 (en) * 2013-07-16 2016-05-26 Corning Incorporated System and method for bending thin glass
FR3063287B1 (fr) * 2017-02-27 2021-09-24 Saint Gobain Vitrage a contrainte d'extension reduite

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4575390A (en) * 1984-11-23 1986-03-11 Glasstech, Inc. Apparatus for forming glass sheets
FI84805C (fi) * 1990-03-30 1992-01-27 Tamglass Oy Foerfarande och formanordning foer att boeja svaora former pao en glasskiva.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9306052A1 *

Also Published As

Publication number Publication date
FI89038B (fi) 1993-04-30
FI914550A0 (fi) 1991-09-27
FI89038C (fi) 1993-08-10
JPH06510736A (ja) 1994-12-01
WO1993006052A1 (fr) 1993-04-01

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