EP3240764A1 - Bent glass sheet supported during cooling - Google Patents

Bent glass sheet supported during cooling

Info

Publication number
EP3240764A1
EP3240764A1 EP15823373.4A EP15823373A EP3240764A1 EP 3240764 A1 EP3240764 A1 EP 3240764A1 EP 15823373 A EP15823373 A EP 15823373A EP 3240764 A1 EP3240764 A1 EP 3240764A1
Authority
EP
European Patent Office
Prior art keywords
sheet
cooling
glass
frame
support
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.)
Withdrawn
Application number
EP15823373.4A
Other languages
German (de)
French (fr)
Inventor
Christophe Machura
Jérôme Gobin
Hervé Thellier
Loïc CROGUENNEC
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.)
Saint Gobain Glass France SAS
Original Assignee
Saint Gobain Glass France SAS
Compagnie de Saint Gobain SA
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 Saint Gobain Glass France SAS, Compagnie de Saint Gobain SA filed Critical Saint Gobain Glass France SAS
Publication of EP3240764A1 publication Critical patent/EP3240764A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B27/00—Tempering or quenching glass products
    • C03B27/04—Tempering or quenching glass products using gas
    • C03B27/044—Tempering or quenching glass products using gas for flat or bent glass sheets being in a horizontal position
    • C03B27/0442—Tempering or quenching glass products using gas for flat or bent glass sheets being in a horizontal position for bent glass sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
    • C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
    • C03B35/20—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by gripping tongs or supporting frames
    • C03B35/202—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by gripping tongs or supporting frames by supporting frames
    • C03B35/207—Construction or design of supporting frames
    • 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
    • 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
    • C03B2225/00—Transporting hot glass sheets during their manufacture
    • C03B2225/02—Means for positioning, aligning or orientating the sheets during their travel, e.g. stops
    • 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
    • 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 invention relates to the field of cooling a curved glass sheet, especially its quenching.
  • the cooling of a glass sheet can be accelerated, in particular by blowing air, in order to cause internal stresses, its hardening and to modify its behavior to breakage. Especially fast cooling is called thermal quenching.
  • the breakage of a tempered pane occurs explosively, with the entire pane instantly transformed into small, non-sharp pieces.
  • Hardened or tempered glass is commonly used in urban areas and as automotive glazing, particularly as a side window, or rear window.
  • a semi-hardened or hardened and unhardened glass is a glass which has been cooled rapidly but less rapidly than for thermal quenching. Tempered glass is highly cured.
  • the thermal hardening of a curved glass sheet is usually performed in the wake of its bending and according to the following process:
  • the thermal hardening treatment performed by the cooling benefits from the fact that the sheet had to be heated for its bending.
  • the sheet is placed on a quenching frame and placed between an upper blower box and a lower blower box.
  • the two main faces of the sheet are subjected to the blowing of cooling air.
  • the bending of the sheet can be carried out at least partially on the same frame as that then used for cooling.
  • the US5974834 teaches the bending and tempering of a glazing comprising a small orifice, essentially to act as a rear window of a motor vehicle.
  • a sheet of glass rests on a cooling frame in horizontal position.
  • the curved glass sheet When resting on the cooling frame, the curved glass sheet generally has its most concave face upwards.
  • a curved glass sheet may have a more complex shape than fully concave on one side and fully convex on the other side.
  • a glass sheet may be concave in a direction on one side and convex in another direction on the same face.
  • Figure 8 a) of WO2012 / 049433 shows such a shape.
  • a sheet may also have on the same face an inversion of curvature, that is to say concave in an area of said face and in one direction and convex in another area of said face and in the same direction (S-shaped ).
  • the cooling frame comprises a track adapted to receive the periphery of the glass sheet.
  • This track has the shape corresponding to the desired final shape for the glass sheet. It was found that the final shape of the sheet may not correspond exactly to that desired even if the cooling frame was in good shape.
  • the shape difference is even higher than the shape of the sheet is complex, especially when one of its face comprises a curvature inversion in a given direction.
  • One way to solve this problem is to compensate for the difference in shape found by an intentional shape gap in the cooling frame. However, such an approach may require the completion and testing of several cooling frames, until the ideal shape is found.
  • the modification of the thermal conditions for carrying out cooling may still have a consequence on the final shape of the sheet.
  • the invention is particularly useful for giving the periphery of the glass sheet the exact shape of the cooling frame when the edges of the sheet, especially its corners, tend to rise during cooling, and generally also during bending by gravity occurring just before cooling on the cooling frame.
  • This problem can arise for any type of shape, such as a horse saddle shape, an S shape or even a shape with low curvatures.
  • This problem arises especially when the bending process chosen involves a higher bending form against which the glass sheet is pressed, the sheet being then collected by the cooling frame according to the invention. The bending then continues on this cooling frame with a tendency of the corners to rise. This tendency is observed between the moment when the glass rests on the cooling frame and until the glass is frozen by the cooling, which puts an end to its deformation.
  • the invention also relates to the device comprising the cooling frame according to the invention and the blowing system for blowing air towards the two main faces of the glass sheet.
  • the blowing system comprises blow boxes disposed on both sides of the sheet, vis-à-vis the two main faces, each blower box being provided with orifices for blowing air to a main face.
  • the cooling frame supporting the glass sheet to be cooled is placed between the boxes and the air blowing on the two main faces causes cooling of the sheet. Quenching exerts a cooling rate of the glass skin of at least 30 ° C / sec. Semi-quenching has a cooling rate of the glass skin of at least 15 ° C / sec.
  • FIG. 1 represents the corner of a glass sheet placed on the cooling frame according to the invention, a support piece being in the spaced apart position at a) and in the support position at b).
  • FIG. 2 shows a support track of a cooling frame, each of the four corners of the support track being provided with a support piece according to the invention actuated by a rotary jack, the support pieces being in the remote position .
  • the invention relates primarily to a cooling frame of a curved glass sheet comprising a support track of the sheet and a removable support piece which, in the support position, press on the upper face of the sheet and periphery of it.
  • the support track has a shape corresponding to the final desired shape of the glass sheet.
  • This support track is generally connected to a more rigid structural frame.
  • This frame structural can be placed under the support track. It can also surround the support track.
  • An adjusting means forming part of the connecting means between the structural frame and the support track makes it possible to act on the shape of the support track by moving points of the support track from the fixed structural frame.
  • the support piece can be connected to the support track or the structural frame.
  • This support piece is removable in that it can move from the support position on the sheet to a spaced apart position away from the sheet so as not to be above it in top view . In the separated position, the support piece no longer touches the sheet. The support piece is thus in the spaced position before the glass sheet rests on the support track of the cooling frame and after sufficient cooling of the glass sheet to avoid any risk of shape modification of the sheet.
  • This spaced position makes it possible to leave sufficient space above the support track to be able to place the sheet on the support track before cooling and to be able to remove and therefore recover the sheet of the cooling frame after cooling.
  • the separation of the glass sheet from the cooling frame can be exerted by a blowing of air from below, sufficiently powerful to lift the sheet, or by the management of the sheet by a suction gripper coming through the above
  • the movement of the support piece to move from the support position to the remote position can be exerted by the action of a jack, including pneumatic, including rotary.
  • a jack including pneumatic, including rotary.
  • the removable support piece can rotate about a fixed axis to move from the support position to the spread position and vice versa.
  • the support piece is positioned to press at a point on the edge of the sheet that lifts up in the absence of support by the support piece.
  • the cooling frame may comprise a plurality of support members, in particular four support members, each acting on a different location from the periphery of the glass sheet, said area being able to lift in the absence of a support piece. .
  • An affected area is often a corner of the sheet but may also be at a notch in one edge of the sheet.
  • cooling tests are carried out beforehand without a support piece to observe in which places it is necessary to equip the cooling frame of support parts, and in a second time, for production, equips the cooling frame of support parts where it is needed.
  • the support piece can press the sheet in one of its corners and if necessary in several of its corners.
  • a sheet comprising several corners or may equip the cooling frame of several support parts, including as much support piece as corner.
  • the glass sheet has four corners and the cooling frame comprises four support pieces for treating each of these corners.
  • the support piece exerts sufficient pressure on the glass sheet so that it does not lose its contact, locally (that is to say, under the support piece), with the support track during cooling.
  • this pressure is in the range of 20g / cm 2 to 1000g / cm 2 .
  • the support piece generally bears on an area in the range of 0.2 to 20 cm 2 . This area concerns each piece of support used. If n support pieces are used, the total bearing area used per sheet is n times 0.2 to 20 cm 2 , spread over n places.
  • the support piece is perforated, that is to say, it allows air to pass between different areas of contact between it and the glass. To do this, it may for example be in the form of a "hand" with three fingers as can be seen in Figure 1.
  • this support piece is made of a thin steel blade (for example each finger of the "hand” is a thin steel blade) whose elasticity makes it possible to soften and dose the pressure exerted on the glass , especially at the moment of contact.
  • the support piece is provided with a refractory fiber interlayer to come into contact with the glass.
  • the peripheral zone on which the support piece presses is generally between the edge of the glass and three centimeters of the edge of the glass on the upper face of the sheet.
  • the support is made between the edge of the glass and one centimeter of the edge of the glass on the upper face of the sheet.
  • the invention also relates to a method for cooling a curved glass sheet on a cooling air cooling cooling frame, the cooling being carried out on the cooling frame according to the invention, the removable support piece supporting on the upper face of the sheet and at the periphery thereof during the blowing of cooling air.
  • the support piece already presses on the sheet before the beginning of the blowing of cooling air.
  • the support piece presses the sheet just after removal of the curved sheet on the track of the cooling frame and preferably already before the start of blowing.
  • the invention is particularly useful for cooling a sheet having an inversion of curvature in a given direction on the same face. It is also particularly useful in the case of the cooling of large sheets, in particular with a main surface area greater than 0.8 m 2 .
  • the cooling exerted on a sheet resting on the cooling frame according to the invention is in particular a semi-thermal quenching or a thermal quenching.
  • the air pressure in the blow boxes is between 500 and 4000 mm of water column, it being understood that the higher the pressure, the stronger the curing effect (c that is, quenching) is strong.
  • the invention also relates to a method of manufacturing a curved glass sheet comprising the thermal bending of the sheet and cooling the sheet by the cooling method on the cooling frame according to the invention.
  • This method may comprise bending by pressing against a higher bending form, especially in an oven at the glass deformation temperature, in particular a solid bending mold, then receiving the sheet by the cooling frame in the oven, and then the exit of the oven from the cooling frame carrying the sheet, then the placement of the cooling frame carrying the sheet between blow boxes, then the blowing of air by the blow boxes on the two main faces of the sheet.
  • the bending by pressing can be performed by suction against the upper form, the latter may be provided with suction means for keeping the sheet against it.
  • the cooling frame may be in the form of bending holding the sheet against it by suction, and then stopping the suction allows the sheet to detach from the upper form and be received by the cooling frame.
  • a lower counterform also makes it possible to press the sheet against the upper bending mold.
  • Figure 1 shows the corner of a glass sheet 1 placed on the cooling frame according to the invention.
  • the metal track 2 covered with a knit 3 of refractory fibers, said knit being maintained on the track by means of lugs 4.
  • the track comprises through holes 5 to increase the access of the cooling air coming from below to the leaf.
  • a support piece 6, a kind of "hand” comprising three fingers in thin steel blades is in the separated position.
  • the support piece 6 being in the support position.
  • An interlayer of the fabric or refractory fiber felt type equips the support piece 6 to come into contact with the glass.
  • FIG. 2 represents a support track 21 of a cooling frame according to the invention.
  • Each of the four corners of the support track 21 is provided with a support piece 22, 23, 24, 25 shown in spaced position (as in Figure 1a)).
  • Each support piece is actuated by a rotary pneumatic cylinder 26, 27, 28, 29 for passing each support piece from a position apart to a support position by a simple rotation.

Abstract

The invention relates to a frame for cooling a bent glass sheet, comprising a support track for the sheet and a removable supporting part which, in the support position and during the blown-air cooling of the sheet, can rest on the upper face of the sheet and along the periphery thereof. The bent sheet being cooled on the cooling frame remains in contact with the frame according to the invention during cooling and its shape more closely matches the desired shape.

Description

FEUILLE DE VERRE BOMBEE  BOMBED GLASS SHEET
MAINTENUE PENDANT SON REFROIDISSEMENT  MAINTAINED DURING ITS COOLING
L'invention concerne le domaine du refroidissement d'une feuille de verre bombée, notamment sa trempe. The invention relates to the field of cooling a curved glass sheet, especially its quenching.
Le refroidissement d'une feuille de verre peut être accélérée, notamment par soufflage d'air, dans le but de provoquer des contraintes interne, son durcissement et de modifier son comportement à la casse. Un refroidissement particulièrement rapide est appelée trempe thermique. La cassure d'une vitre trempée se produit de façon explosive, l'ensemble de la vitre étant instantanément transformée en petits morceaux non-coupants. Les verres durcis ou trempés sont couramment utilisés dans l'espace urbain et comme vitrage automobile, notamment comme vitre latérale de portière, ou lunette arrière. Un verre semi- durci ou durci et non trempé est un verre ayant subi un refroidissement rapide mais moins rapide que pour une trempe thermique. Un verre trempé est fortement durci.  The cooling of a glass sheet can be accelerated, in particular by blowing air, in order to cause internal stresses, its hardening and to modify its behavior to breakage. Especially fast cooling is called thermal quenching. The breakage of a tempered pane occurs explosively, with the entire pane instantly transformed into small, non-sharp pieces. Hardened or tempered glass is commonly used in urban areas and as automotive glazing, particularly as a side window, or rear window. A semi-hardened or hardened and unhardened glass is a glass which has been cooled rapidly but less rapidly than for thermal quenching. Tempered glass is highly cured.
Le durcissement thermique d'une feuille de verre bombée est habituellement réalisé dans la foulée de son bombage et selon le processus suivant :  The thermal hardening of a curved glass sheet is usually performed in the wake of its bending and according to the following process:
- chauffage d'une feuille plane à la température de bombage thermique, à sa température de déformation plastique, habituellement entre 580 et 700°C, puis  heating a flat sheet at the thermal bending temperature to its plastic deformation temperature, usually between 580 and 700 ° C., and then
- bombage de la feuille, puis  - bending the leaf, then
- refroidissement rapide de la feuille par soufflage d'air.  - Fast cooling of the sheet by blowing air.
Ainsi, le traitement de durcissement thermique opéré par le refroidissement profite de ce que la feuille a dû être chauffée pour son bombage. Pour cette étape de refroidissement, la feuille est posée sur un cadre de trempe et placée entre un caisson de soufflage supérieur et un caisson de soufflage inférieur. Les deux faces principales de la feuille (l'une étant tournée vers le haut et l'autre étant tournée vers le bas) sont soumises au soufflage d'air de refroidissement. Le bombage de la feuille peut être réalisé au moins partiellement sur le même cadre que celui utilisé ensuite pour le refroidissement. Le US5974834 enseigne le bombage et la trempe d'un vitrage comprenant un orifice de faible taille, essentiellement pour faire office de lunette arrière de véhicule automobile. Thus, the thermal hardening treatment performed by the cooling benefits from the fact that the sheet had to be heated for its bending. For this cooling step, the sheet is placed on a quenching frame and placed between an upper blower box and a lower blower box. The two main faces of the sheet (one facing upwards and the other facing downwards) are subjected to the blowing of cooling air. The bending of the sheet can be carried out at least partially on the same frame as that then used for cooling. The US5974834 teaches the bending and tempering of a glazing comprising a small orifice, essentially to act as a rear window of a motor vehicle.
Pour le refroidissement par soufflage d'air, une feuille de verre repose sur un cadre de refroidissement en position horizontale. Lorsqu'elle repose sur le cadre de refroidissement, la feuille de verre bombée présente généralement sa face la plus concave vers le haut. En fait, une feuille de verre bombée peut avoir une forme plus complexe que entièrement concave sur une face et entièrement convexe sur l'autre face. Une feuille de verre peut être concave selon une direction sur une face et convexe selon une autre direction sur la même face. La figure 8 a) du WO2012/049433 montre une telle forme. Une feuille peut également présenter sur la même face une inversion de courbure, c'est-à-dire concave en une zone de ladite face et selon une direction et convexe en une autre zone de ladite face et selon la même direction (forme en S).  For cooling by blowing air, a sheet of glass rests on a cooling frame in horizontal position. When resting on the cooling frame, the curved glass sheet generally has its most concave face upwards. In fact, a curved glass sheet may have a more complex shape than fully concave on one side and fully convex on the other side. A glass sheet may be concave in a direction on one side and convex in another direction on the same face. Figure 8 a) of WO2012 / 049433 shows such a shape. A sheet may also have on the same face an inversion of curvature, that is to say concave in an area of said face and in one direction and convex in another area of said face and in the same direction (S-shaped ).
Le cadre de refroidissement comprend une piste apte à recevoir la périphérie de la feuille de verre. Cette piste a la forme correspondant à la forme finale souhaitée pour la feuille de verre. On s'est aperçu que la forme finale de la feuille pouvait ne pas correspondre exactement à celle souhaitée même si le cadre de refroidissement avait bien la bonne forme. L'écart de forme est d'autant plus élevé que la forme de la feuille est complexe, notamment lorsque l'une de ses face comprend une inversion de courbure selon une direction donnée. Une façon de résoudre ce problème est de compenser l'écart de forme constaté par un écart de forme intentionnel au niveau du cadre de refroidissement. Cependant, une telle démarche peut nécessiter la réalisation et l'essai de plusieurs cadres de refroidissement, jusqu'à ce que la forme idéale soit trouvée. De plus, pour un cadre de refroidissement donné, la modification des conditions thermiques de réalisation du refroidissement risque encore d'avoir une conséquence sur la forme finale de la feuille.  The cooling frame comprises a track adapted to receive the periphery of the glass sheet. This track has the shape corresponding to the desired final shape for the glass sheet. It was found that the final shape of the sheet may not correspond exactly to that desired even if the cooling frame was in good shape. The shape difference is even higher than the shape of the sheet is complex, especially when one of its face comprises a curvature inversion in a given direction. One way to solve this problem is to compensate for the difference in shape found by an intentional shape gap in the cooling frame. However, such an approach may require the completion and testing of several cooling frames, until the ideal shape is found. In addition, for a given cooling frame, the modification of the thermal conditions for carrying out cooling may still have a consequence on the final shape of the sheet.
On a maintenant trouvé un moyen de refroidir une feuille de verre sur un cadre de refroidissement de sorte que la feuille finale ait bien la même forme que celle du cadre de refroidissement. Grâce à cette solution, il devient inutile de tâtonner à réaliser une multitude de cadres et de plus, les conditions thermiques de réalisation du refroidissement peuvent varier sans avoir grande influence sur la forme finale. L'observation du comportement de feuilles soumises au refroidissement par soufflage d'air a montré que les coins de la feuille ont tendance à se relever légèrement juste avant le soufflage ou pendant le soufflage. On a alors imaginé de maintenir les coins de la feuille en appuyant sur leur face supérieure aux endroits problématiques, c'est-à-dire susceptibles de se relever pendant le refroidissement voire même déjà avant le refroidissement. Cette action a effectivement permis de résoudre le problème susmentionné. We have now found a way to cool a glass sheet on a cooling frame so that the final sheet has the same shape as that of the cooling frame. Thanks to this solution, it becomes useless to fumble to realize a multitude of frames and moreover, the thermal conditions Cooling performance can vary without much influence on the final shape. Observation of the behavior of sheets subjected to air-blast cooling has shown that the corners of the sheet tend to rise slightly just before blowing or during blowing. It was then imagined to maintain the corners of the sheet by pressing on their upper face at problematic locations, that is to say likely to rise during cooling or even before cooling. This action effectively solved the problem mentioned above.
L'invention est particulièrement utile pour donner à la périphérie de la feuille de verre la forme exacte du cadre de refroidissement lorsque les bords de la feuille, surtout ses coins, ont tendance à se relever pendant le refroidissement, et généralement également pendant le bombage par gravité intervenant juste avant le refroidissement sur le cadre de refroidissement. Ce problème peut se poser pour tout type de forme, comme une forme en selle de cheval, une forme en S ou même une forme présentant de faibles courbures. Ce problème se pose notamment lorsque le procédé de bombage choisi fait intervenir une forme supérieure de bombage contre laquelle la feuille de verre est pressée, la feuille étant ensuite recueillie par le cadre de refroidissement selon l'invention. Le bombage se poursuit alors sur ce cadre de refroidissement avec une tendance des coins à se relever. Cette tendance est observée entre le moment où le verre repose sur le cadre de refroidissement et jusqu'à ce que le verre soit figé par le refroidissement, ce qui met fin à sa déformation. Ce comportement est plus fort lorsque le pressage contre la forme supérieure est réalisé dans un four dont l'intérieur est porté à la température de bombage, le cadre de refroidissement selon l'invention rentrant ensuite dans le four pour se positionner sous la forme supérieure de bombage et recueillir la feuille venant d'être bombé par la forme supérieure de bombage. Le cadre de refroidissement selon l'invention portant la feuille bombée sort ensuite du four pour se placer en zone de refroidissement entre des caissons de trempe qui vont souffler de l'air de refroidissement sur les deux faces principales de la feuille de verre. Le refroidissement de la feuille sur le cadre selon l'invention est donc exercé sur la feuille dont la chaleur provient de l'étape de bombage qui vient de précéder. La température de la feuille ne fait que décroître entre la fin de son contact avec la forme supérieure de bombage et le début du soufflage. The invention is particularly useful for giving the periphery of the glass sheet the exact shape of the cooling frame when the edges of the sheet, especially its corners, tend to rise during cooling, and generally also during bending by gravity occurring just before cooling on the cooling frame. This problem can arise for any type of shape, such as a horse saddle shape, an S shape or even a shape with low curvatures. This problem arises especially when the bending process chosen involves a higher bending form against which the glass sheet is pressed, the sheet being then collected by the cooling frame according to the invention. The bending then continues on this cooling frame with a tendency of the corners to rise. This tendency is observed between the moment when the glass rests on the cooling frame and until the glass is frozen by the cooling, which puts an end to its deformation. This behavior is stronger when the pressing against the upper shape is carried out in an oven whose interior is brought to the bending temperature, the cooling frame according to the invention then entering the furnace to position itself in the upper form of bending and collect the newly bent sheet by the upper bending form. The cooling frame according to the invention carrying the curved sheet then leaves the oven to be placed in a cooling zone between quenching boxes which will blow cooling air on the two main faces of the glass sheet. The cooling of the sheet on the frame according to the invention is therefore exerted on the sheet whose heat comes from the bending step which has just preceded. The temperature of the sheet is only decrease between the end of its contact with the upper bending form and the start of blowing.
On peut constater un fort effondrement, généralement supérieure à 1 cm, et même supérieure à 2 cm, voire même supérieure à 3 cm, entre le moment où le verre repose sur le cadre de refroidissement et celui pour lequel le verre est figé par le refroidissement, l'écart de temps entre ces deux moment pouvant être supérieure à 1 seconde et même supérieure à 2 secondes. Plus cet effondrement est fort et plus les bords du verre, surtout les coins, ont tendance à se relever.  It can be seen a strong collapse, generally greater than 1 cm, and even greater than 2 cm, or even greater than 3 cm, between the moment when the glass rests on the cooling frame and the one for which the glass is frozen by the cooling , the time difference between these two moments being greater than 1 second and even greater than 2 seconds. The stronger the collapse, the more edges of the glass, especially the corners, tend to rise.
L'invention concerne également le dispositif comprenant le cadre de refroidissement selon l'invention et le système de soufflage pour souffler de l'air vers les deux faces principales de la feuille de verre. Le système de soufflage comprend des caissons de soufflage disposés de part et d'autre de la feuille, vis- à-vis des deux faces principales, chaque caisson de soufflage étant muni d'orifices pour souffler de l'air vers une face principale. Le cadre de refroidissement supportant la feuille de verre à refroidir est placé entre les caissons et le soufflage d'air sur les deux faces principales provoque le refroidissement de la feuille. Une trempe exerce une vitesse de refroidissement de la peau de verre d'au moins 30°C/seconde. Une semi-trempe exerce une vitesse de refroidissement de la peau de verre d'au moins 15°C/seconde.  The invention also relates to the device comprising the cooling frame according to the invention and the blowing system for blowing air towards the two main faces of the glass sheet. The blowing system comprises blow boxes disposed on both sides of the sheet, vis-à-vis the two main faces, each blower box being provided with orifices for blowing air to a main face. The cooling frame supporting the glass sheet to be cooled is placed between the boxes and the air blowing on the two main faces causes cooling of the sheet. Quenching exerts a cooling rate of the glass skin of at least 30 ° C / sec. Semi-quenching has a cooling rate of the glass skin of at least 15 ° C / sec.
La figure 1 représente le coin d'une feuille de verre posée sur le cadre de refroidissement selon l'invention, une pièce d'appui étant en position écartée en a) et en position d'appui en b).  FIG. 1 represents the corner of a glass sheet placed on the cooling frame according to the invention, a support piece being in the spaced apart position at a) and in the support position at b).
La figure 2 représente une piste support d'un cadre de refroidissement, chacun des quatre coins de la piste support étant muni d'une pièce d'appui selon l'invention actionnée par un vérin rotatif, les pièces d'appui étant en position écartée.  FIG. 2 shows a support track of a cooling frame, each of the four corners of the support track being provided with a support piece according to the invention actuated by a rotary jack, the support pieces being in the remote position .
L'invention concerne en premier lieu un cadre de refroidissement d'une feuille de verre bombée comprenant une piste support de la feuille et une pièce d'appui amovible pouvant, en position d'appui, appuyer sur la face supérieure de la feuille et en périphérie de celle-ci. La piste support présente une forme correspondant à la forme souhaitée finale de la feuille de verre. Cette piste support est généralement reliée à un cadre structurel plus rigide. Ce cadre structurel peut être placé sous la piste support. Il peut aussi entourer la piste support. Un moyen de réglage faisant partie du moyen de liaison entre le cadre structurel et la piste support permet d'agir sur la forme de la piste support par déplacement de points de la piste support à partir du cadre structurel fixe. La pièce d'appui peut être reliée à la piste support ou au cadre structurel. Cette pièce d'appui est amovible en ce sens qu'elle peut passer de la position d'appui sur la feuille à une position écartée en s'écartant de la feuille pour ne pas se retrouver au-dessus d'elle en vue de dessus. En position écartée, la pièce d'appui ne touche plus la feuille. La pièce d'appui est ainsi en position écartée avant que la feuille de verre ne repose sur la piste support du cadre de refroidissement et après le refroidissement suffisant de la feuille de verre pour ne plus risquer de modification de forme de la feuille. Cette position écartée permet de dégager un espace suffisant au-dessus de la piste support pour pouvoir poser la feuille sur la piste support avant le refroidissement et pour pouvoir éloigner et donc récupérer la feuille du cadre de refroidissement après le refroidissement. Notamment, la séparation de la feuille de verre du cadre de refroidissement peut être exercée par un soufflage d'air venant du dessous, suffisamment puissant pour soulever la feuille, ou par la prise en charge de la feuille par un préhenseur à ventouses venant par le dessus The invention relates primarily to a cooling frame of a curved glass sheet comprising a support track of the sheet and a removable support piece which, in the support position, press on the upper face of the sheet and periphery of it. The support track has a shape corresponding to the final desired shape of the glass sheet. This support track is generally connected to a more rigid structural frame. This frame structural can be placed under the support track. It can also surround the support track. An adjusting means forming part of the connecting means between the structural frame and the support track makes it possible to act on the shape of the support track by moving points of the support track from the fixed structural frame. The support piece can be connected to the support track or the structural frame. This support piece is removable in that it can move from the support position on the sheet to a spaced apart position away from the sheet so as not to be above it in top view . In the separated position, the support piece no longer touches the sheet. The support piece is thus in the spaced position before the glass sheet rests on the support track of the cooling frame and after sufficient cooling of the glass sheet to avoid any risk of shape modification of the sheet. This spaced position makes it possible to leave sufficient space above the support track to be able to place the sheet on the support track before cooling and to be able to remove and therefore recover the sheet of the cooling frame after cooling. In particular, the separation of the glass sheet from the cooling frame can be exerted by a blowing of air from below, sufficiently powerful to lift the sheet, or by the management of the sheet by a suction gripper coming through the above
Notamment, le mouvement de la pièce d'appui pour passer de la position d'appui à la position écartée peut être exercé par l'action d'un vérin, notamment pneumatique, notamment rotatif. Ainsi, la pièce d'appui amovible peut tourner autour d'un axe fixe pour passer de la position d'appui à la position écartée et vice versa.  In particular, the movement of the support piece to move from the support position to the remote position can be exerted by the action of a jack, including pneumatic, including rotary. Thus, the removable support piece can rotate about a fixed axis to move from the support position to the spread position and vice versa.
La pièce d'appui est positionnée pour appuyer à un endroit de la bordure de la feuille se soulevant en l'absence d'appui par la pièce d'appui. Le cadre de refroidissement peut comprendre plusieurs pièces d'appuis, notamment quatre pièces d'appuis, agissant chacune sur un endroit différent de la périphérie de la feuille de verre, ledit endroit étant susceptible de se soulever en l'absence de pièce d'appui. Un endroit concerné est souvent un coin de la feuille mais peut aussi se situer au niveau d'une encoche dans un bord de la feuille. Dans la pratique, on fait au préalable des essais de refroidissement sans pièce d'appui pour observer à quels endroits il convient d'équiper le cadre de refroidissement de pièces d'appuis, et dans un deuxième temps, pour la production, on équipe le cadre de refroidissement de pièces d'appui aux endroits le nécessitant. Notamment, la pièce d'appui peut appuyer sur la feuille dans un de ses coins et le cas échéant dans plusieurs de ses coins. Dans le cas d'une feuille comprenant plusieurs coins ou peut équiper le cadre de refroidissement de plusieurs pièces d'appui, notamment d'autant de pièce d'appui que de coin. Généralement, la feuille de verre comprend quatre coins et le cadre de refroidissement comprend quatre pièces d'appuis pour traiter chacun de ces coins. The support piece is positioned to press at a point on the edge of the sheet that lifts up in the absence of support by the support piece. The cooling frame may comprise a plurality of support members, in particular four support members, each acting on a different location from the periphery of the glass sheet, said area being able to lift in the absence of a support piece. . An affected area is often a corner of the sheet but may also be at a notch in one edge of the sheet. In practice, cooling tests are carried out beforehand without a support piece to observe in which places it is necessary to equip the cooling frame of support parts, and in a second time, for production, equips the cooling frame of support parts where it is needed. In particular, the support piece can press the sheet in one of its corners and if necessary in several of its corners. In the case of a sheet comprising several corners or may equip the cooling frame of several support parts, including as much support piece as corner. Generally, the glass sheet has four corners and the cooling frame comprises four support pieces for treating each of these corners.
La pièce d'appui exerce une pression suffisante sur la feuille de verre pour que celle-ci ne perde pas son contact, localement (c'est-à-dire sous la pièce d'appui), avec la piste support lors du refroidissement. Généralement, cette pression est comprise dans le domaine allant de 20g/cm2 à 1000g/cm2. The support piece exerts sufficient pressure on the glass sheet so that it does not lose its contact, locally (that is to say, under the support piece), with the support track during cooling. Generally, this pressure is in the range of 20g / cm 2 to 1000g / cm 2 .
La pièce d'appui appuie généralement sur une aire comprise dans le domaine allant de 0,2 à 20 cm2. Cette aire concerne chaque pièce d'appui utilisée. Si n pièces d'appui sont utilisées, l'aire totale d'appui utilisée par feuille est de n fois 0,2 à 20 cm2, réparti sur n endroits. La pièce d'appui est ajourée, c'est-à-dire qu'elle laisse passer l'air entre différentes zones de contact entre elle et le verre. Pour ce faire, elle peut par exemple avoir la forme d'une « main » à trois doigts comme on peut le voir sur la figure 1 . Avantageusement, cette pièce d'appui est réalisée en une lame d'acier fin (par exemple chaque doigt de la « main » est une fine lame d'acier) dont l'élasticité permet d'adoucir et doser la pression exercée sur le verre, notamment au moment du contact. De préférence, la pièce d'appui est munie d'un intercalaire en fibres réfractaire pour venir au contact du verre. The support piece generally bears on an area in the range of 0.2 to 20 cm 2 . This area concerns each piece of support used. If n support pieces are used, the total bearing area used per sheet is n times 0.2 to 20 cm 2 , spread over n places. The support piece is perforated, that is to say, it allows air to pass between different areas of contact between it and the glass. To do this, it may for example be in the form of a "hand" with three fingers as can be seen in Figure 1. Advantageously, this support piece is made of a thin steel blade (for example each finger of the "hand" is a thin steel blade) whose elasticity makes it possible to soften and dose the pressure exerted on the glass , especially at the moment of contact. Preferably, the support piece is provided with a refractory fiber interlayer to come into contact with the glass.
La zone périphérique sur laquelle la pièce d'appui appuie est généralement comprise entre le bord du verre et trois centimètres du bord du verre sur la face supérieure de la feuille. De préférence, l'appui est réalisé entre le bord du verre et un centimètre du bord du verre sur la face supérieure de la feuille.  The peripheral zone on which the support piece presses is generally between the edge of the glass and three centimeters of the edge of the glass on the upper face of the sheet. Preferably, the support is made between the edge of the glass and one centimeter of the edge of the glass on the upper face of the sheet.
L'invention concerne également un procédé de refroidissement d'une feuille de verre bombée sur un cadre de refroidissement par soufflage d'air de refroidissement, le refroidissement étant effectué sur le cadre de refroidissement selon l'invention, la pièce d'appui amovible appuyant sur la face supérieure de la feuille et en périphérie de celle-ci pendant le soufflage d'air de refroidissement. De préférence, la pièce d'appui appuie déjà sur la feuille avant le commencement du soufflage d'air de refroidissement. La pièce d'appui appuie sur la feuille juste après la dépose de la feuille bombée sur la piste du cadre de refroidissement et de préférence déjà avant le début du soufflage. L'invention est particulièrement utile pour le refroidissement d'une feuille présentant une inversion de courbure selon une direction donnée sur la même face. Elle est aussi particulièrement utile dans le cas du refroidissement de grandes feuilles, notamment dont l'aire d'une face principale est supérieure à 0,8 m2. The invention also relates to a method for cooling a curved glass sheet on a cooling air cooling cooling frame, the cooling being carried out on the cooling frame according to the invention, the removable support piece supporting on the upper face of the sheet and at the periphery thereof during the blowing of cooling air. Preferably, the support piece already presses on the sheet before the beginning of the blowing of cooling air. The support piece presses the sheet just after removal of the curved sheet on the track of the cooling frame and preferably already before the start of blowing. The invention is particularly useful for cooling a sheet having an inversion of curvature in a given direction on the same face. It is also particularly useful in the case of the cooling of large sheets, in particular with a main surface area greater than 0.8 m 2 .
Le refroidissement exercé sur une feuille reposant sur le cadre de refroidissement selon l'invention est notamment une semi-trempe thermique ou une trempe thermique. Pour exercer un traitement de semi-trempe ou trempe, la pression d'air dans les caissons de soufflage est comprise entre 500 et 4000 mm de colonne d'eau, étant entendu que plus la pression est forte plus l'effet de durcissement (c'est-à-dire de trempe) est fort.  The cooling exerted on a sheet resting on the cooling frame according to the invention is in particular a semi-thermal quenching or a thermal quenching. To exert a treatment of semi-quenching or quenching, the air pressure in the blow boxes is between 500 and 4000 mm of water column, it being understood that the higher the pressure, the stronger the curing effect (c that is, quenching) is strong.
Ainsi, l'invention concerne également un procédé de fabrication d'une feuille de verre bombée comprenant le bombage thermique de la feuille puis le refroidissement de la feuille par le procédé de refroidissement sur le cadre de refroidissement selon l'invention. Ce procédé peut comprendre le bombage par pressage contre une forme supérieure de bombage, notamment dans un four à la température de déformation du verre, notamment une forme pleine de bombage, puis la réception de la feuille par le cadre de refroidissement dans le four, puis la sortie du four du cadre de refroidissement portant la feuille, puis le placement du cadre de refroidissement portant la feuille entre des caissons de soufflage, puis le soufflage d'air par les caissons de soufflage sur les deux faces principales de la feuille. Notamment, le bombage par pressage peut être réalisé par aspiration contre la forme supérieure, celle-ci pouvant être munie de moyens d'aspiration permettant de maintenir la feuille contre elle. Le cadre de refroidissement peut se placer sous la forme de bombage maintenant la feuille contre elle par aspiration, puis l'arrêt de l'aspiration permet à la feuille de se détacher de la forme supérieure et d'être réceptionnée par le cadre de refroidissement. Une contreforme inférieure permet également d'exercer un pressage de la feuille contre la forme supérieure de bombage. Thus, the invention also relates to a method of manufacturing a curved glass sheet comprising the thermal bending of the sheet and cooling the sheet by the cooling method on the cooling frame according to the invention. This method may comprise bending by pressing against a higher bending form, especially in an oven at the glass deformation temperature, in particular a solid bending mold, then receiving the sheet by the cooling frame in the oven, and then the exit of the oven from the cooling frame carrying the sheet, then the placement of the cooling frame carrying the sheet between blow boxes, then the blowing of air by the blow boxes on the two main faces of the sheet. In particular, the bending by pressing can be performed by suction against the upper form, the latter may be provided with suction means for keeping the sheet against it. The cooling frame may be in the form of bending holding the sheet against it by suction, and then stopping the suction allows the sheet to detach from the upper form and be received by the cooling frame. A lower counterform also makes it possible to press the sheet against the upper bending mold.
La figure 1 représente le coin d'une feuille de verre 1 posée sur le cadre de refroidissement selon l'invention. En a) on distingue la piste 2 métallique recouverte d'un tricot 3 en fibres réfractaires, ledit tricot étant maintenu sur la piste grâce à des ergots 4. La piste comprend des orifices traversant 5 pour augmenter l'accès de l'air de refroidissement venant du dessous à la feuille. Une pièce d'appuis 6, sorte de « main » comprenant trois doigts en fines lames d'acier est en position écartée. En b), on voit les mêmes éléments qu'en a), la pièce d'appuis 6 étant en position d'appui. Un intercalaire du type tissu ou feutre en fibres réfractaire (non représenté) équipe la pièce d'appui 6 pour venir au contact du verre.  Figure 1 shows the corner of a glass sheet 1 placed on the cooling frame according to the invention. In a) there is the metal track 2 covered with a knit 3 of refractory fibers, said knit being maintained on the track by means of lugs 4. The track comprises through holes 5 to increase the access of the cooling air coming from below to the leaf. A support piece 6, a kind of "hand" comprising three fingers in thin steel blades is in the separated position. In b), we see the same elements as a), the support piece 6 being in the support position. An interlayer of the fabric or refractory fiber felt type (not shown) equips the support piece 6 to come into contact with the glass.
La figure 2 représente une piste support 21 d'un cadre de refroidissement selon l'invention. Chacun des quatre coins de la piste support 21 est muni d'une pièce d'appui 22, 23, 24, 25 représenté en position écarté (comme sur la figure 1 a)). Chaque pièce d'appui est actionné par un vérin pneumatique rotatif 26, 27, 28, 29 permettant de faire passer chaque pièce d'appui d'une position écartée à une position d'appui par une simple rotation.  FIG. 2 represents a support track 21 of a cooling frame according to the invention. Each of the four corners of the support track 21 is provided with a support piece 22, 23, 24, 25 shown in spaced position (as in Figure 1a)). Each support piece is actuated by a rotary pneumatic cylinder 26, 27, 28, 29 for passing each support piece from a position apart to a support position by a simple rotation.

Claims

REVENDICATIONS
1 . Cadre de refroidissement d'une feuille de verre bombée comprenant une piste support de la feuille et une pièce d'appui amovible pouvant, en position d'appui et pendant un refroidissement de ladite feuille par soufflage d'air, appuyer sur la face supérieure de la feuille et en périphérie de celle-ci.  1. Cooling frame of a curved glass sheet comprising a support track of the sheet and a removable support piece which can, in the support position and during a cooling of said sheet by blowing air, press on the upper face of the leaf and on the periphery of it.
2. Cadre selon la revendication précédente, caractérisé en ce que la pièce d'appui peut passer en position écartée en s'écartant de la feuille pour ne pas se retrouver au-dessus d'elle en vue de dessus.  2. Frame according to the preceding claim, characterized in that the support piece can move away from the sheet so as not to be above it when viewed from above.
3. Cadre selon l'une des revendications précédentes, caractérisé en ce que la pièce d'appui amovible tourne autour d'un axe fixe pour passer de la position d'appui à la position écartée et vice versa.  3. Frame according to one of the preceding claims, characterized in that the removable support piece rotates about a fixed axis to move from the support position to the spread position and vice versa.
4. Cadre selon l'une des revendications précédentes, caractérisé en ce que la pièce d'appui est amovible par l'action d'un vérin.  4. Frame according to one of the preceding claims, characterized in that the support piece is removable by the action of a jack.
5. Cadre selon l'une des revendications précédentes, caractérisé en ce que la pièce d'appui appuie sur la feuille dans un de ses coins, et le cas échéant dans plusieurs de ses coins.  5. Frame according to one of the preceding claims, characterized in that the bearing part bears on the sheet in one of its corners, and where appropriate in several of its corners.
6. Cadre selon l'une des revendications précédentes, caractérisé en ce que la pièce d'appui exerce une pression comprise dans le domaine allant de 20g/cm2 à 1000g/cm2. 6. Frame according to one of the preceding claims, characterized in that the support member exerts a pressure in the range of 20g / cm 2 to 1000g / cm 2 .
7. Cadre selon l'une des revendications précédentes, caractérisé en ce que la pièce d'appui appuie sur une aire comprise dans le domaine allant de 0,2 à 20 cm2. 7. Frame according to one of the preceding claims, characterized in that the support part bears on an area in the range of 0.2 to 20 cm 2 .
8. Cadre selon l'une des revendications précédentes, caractérisé en ce que la pièce d'appui appuie sur une zone comprise entre le bord du verre et trois centimètres du bord du verre sur la face supérieure de la feuille.  8. Frame according to one of the preceding claims, characterized in that the bearing part bears on an area between the edge of the glass and three centimeters of the edge of the glass on the upper face of the sheet.
9. Cadre selon la revendication précédente, caractérisé en ce que la pièce d'appui appuie sur une zone comprise entre le bord du verre et un centimètre du bord du verre sur la face supérieure de la feuille.  9. Frame according to the preceding claim, characterized in that the bearing part bears on an area between the edge of the glass and one centimeter of the edge of the glass on the upper face of the sheet.
10. Cadre selon l'une des revendications précédentes, caractérisé en ce qu'il comprend plusieurs pièces d'appuis, notamment quatre pièces d'appuis, agissant chacune sur un endroit différent de la périphérie de la feuille de verre. 10. Frame according to one of the preceding claims, characterized in that it comprises a plurality of support parts, including four parts of supports, each acting on a different location of the periphery of the glass sheet.
1 1 . Dispositif de refroidissement d'une feuille de verre bombée comprenant un cadre de refroidissement de l'une des revendications précédentes et des caissons de soufflage d'air pouvant souffler de l'air sur les deux faces principales de la feuille de verre.  1 1. A device for cooling a curved glass sheet comprising a cooling frame of one of the preceding claims and air blow boxes capable of blowing air on the two main faces of the glass sheet.
12. Procédé de préparation d'une feuille de verre bombée comprenant le bombage thermique de la feuille puis le refroidissement de la feuille par soufflage d'air, caractérisé en ce que le refroidissement est effectué sur le cadre de refroidissement ou par le dispositif de refroidissement de l'une des revendications précédentes, la pièce d'appui amovible appuyant sur la face supérieure de la feuille et en périphérie de celle-ci pendant le soufflage d'air.  12. A process for preparing a curved glass sheet comprising thermal bending of the sheet and then cooling the sheet by blowing air, characterized in that the cooling is carried out on the cooling frame or by the cooling device. of one of the preceding claims, the removable support piece pressing on the upper face of the sheet and at the periphery thereof during the blowing of air.
13. Procédé selon la revendication précédente de procédé, caractérisé en ce qu'entre le moment où le verre repose sur le cadre de refroidissement et celui pour lequel il est figé, le verre s'effondre de plus de 1 cm voire de plus 2 cm voire même de plus de 3 cm.  13. Method according to the preceding claim for the process, characterized in that between the moment when the glass rests on the cooling frame and the one for which it is fixed, the glass collapses more than 1 cm or even more than 2 cm. even more than 3 cm.
14. Procédé selon l'une des revendications précédentes de procédé, caractérisé en ce que la pièce d'appui exerce une pression suffisante sur la feuille de verre pour que celle-ci ne perde pas son contact, localement, avec la piste support lors du soufflage d'air.  14. Method according to one of the preceding method claims, characterized in that the support member exerts sufficient pressure on the glass sheet so that it does not lose its contact locally with the support track during the air blowing.
15. Procédé selon l'une des revendications précédentes de procédé, caractérisé en ce que la pièce d'appui commence à appuyer sur la face supérieure de la feuille et en périphérie de celle-ci avant le soufflage d'air de refroidissement.  15. Method according to one of the preceding process claims, characterized in that the support piece begins to press the upper face of the sheet and the periphery thereof before the blowing of cooling air.
16. Procédé selon l'une des revendications précédentes de procédé, caractérisé en ce que pour le refroidissement, le cadre de refroidissement supportant la feuille de verre se place entre des caissons de soufflage, puis les caissons de soufflage soufflent de l'air sur les faces principales de la feuille de verre.  16. Method according to one of the preceding process claims, characterized in that for cooling, the cooling frame supporting the glass sheet is placed between blow boxes, then the blow boxes blow air on the main faces of the glass sheet.
17. Procédé selon la revendication précédente, caractérisé en ce qu'il comprend le bombage par pressage contre une forme supérieure de bombage, puis la réception de la feuille par le cadre de refroidissement, puis le placement du cadre de refroidissement portant la feuille entre les caissons de soufflage, puis le refroidissement de la feuille par de l'air soufflé par les caissons de soufflage. 17. Method according to the preceding claim, characterized in that it comprises bending by pressing against a higher form of bending, then the reception of the sheet by the cooling frame, then the placement of the cooling frame carrying the sheet between the blow boxes, then the cooling of the sheet by air blown by the blow boxes.
18. Procédé selon la revendication précédente, caractérisé en ce que le bombage par pressage est réalisé dans un four à la température de déformation du verre, puis la feuille est réceptionnée dans le four par le cadre de refroidissement, puis le cadre de refroidissement portant la feuille sort du four pour se placer entre les caissons de soufflage, puis la feuille est refroidie par le soufflage d'air.  18. Method according to the preceding claim, characterized in that the bending by pressing is carried out in an oven at the glass deformation temperature, then the sheet is received in the oven by the cooling frame, then the cooling frame carrying the sheet leaves the oven to stand between the blow boxes, then the sheet is cooled by blowing air.
19. Procédé selon l'une des revendications 16 à 18, caractérisé en ce que la pression d'air dans les caissons de soufflage est comprise entre 500 et 4000 mm de colonne d'eau.  19. Method according to one of claims 16 to 18, characterized in that the air pressure in the blow boxes is between 500 and 4000 mm of water column.
20. Procédé selon l'une des revendications précédentes de procédé, caractérisé en ce que la feuille présente une aire de face principale supérieure à 0,8 m2. 20. Method according to one of the preceding method claims, characterized in that the sheet has a main face area greater than 0.8 m 2 .
21 . Procédé selon l'une des revendications précédentes de procédé, caractérisé en ce que le refroidissement est une semi-trempe thermique ou une trempe thermique.  21. Method according to one of the preceding method claims, characterized in that the cooling is a semi-thermal quenching or a thermal quenching.
EP15823373.4A 2014-12-30 2015-12-29 Bent glass sheet supported during cooling Withdrawn EP3240764A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1463433A FR3031101B1 (en) 2014-12-30 2014-12-30 BOBBY GLASS SHEET MAINTAINED DURING ITS COOLING
PCT/FR2015/053766 WO2016108028A1 (en) 2014-12-30 2015-12-29 Bent glass sheet supported during cooling

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EP3240764A1 true EP3240764A1 (en) 2017-11-08

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US (1) US11142477B2 (en)
EP (1) EP3240764A1 (en)
JP (1) JP6924141B2 (en)
KR (1) KR20170101922A (en)
CN (2) CN112830672A (en)
BR (1) BR112017012385A2 (en)
CA (1) CA2971022A1 (en)
EA (1) EA033879B1 (en)
FR (1) FR3031101B1 (en)
MX (1) MX2017008704A (en)
WO (1) WO2016108028A1 (en)

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KR101778232B1 (en) * 2016-12-29 2017-09-13 주식회사 제이앤티씨 Forming apparatus
BR112019010702A2 (en) * 2017-02-20 2019-10-01 Saint Gobain tempering frame for tempering glass panels
FR3097542B1 (en) 2019-06-19 2021-06-18 Saint Gobain Cooling device

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JP6924141B2 (en) 2021-08-25
FR3031101A1 (en) 2016-07-01
CN105960382A (en) 2016-09-21
US11142477B2 (en) 2021-10-12
BR112017012385A2 (en) 2018-04-24
FR3031101B1 (en) 2019-07-12
EA033879B1 (en) 2019-12-04
JP2018504351A (en) 2018-02-15
KR20170101922A (en) 2017-09-06
CA2971022A1 (en) 2016-07-07
WO2016108028A1 (en) 2016-07-07
EA201791501A1 (en) 2017-10-31
US20170349476A1 (en) 2017-12-07
CN112830672A (en) 2021-05-25
MX2017008704A (en) 2017-10-31

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