FR2624501A1 - Rouleaux de transport pour la zone chaude d'un four de trempe et/ou de bombage de feuilles de verre - Google Patents

Rouleaux de transport pour la zone chaude d'un four de trempe et/ou de bombage de feuilles de verre Download PDF

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Publication number
FR2624501A1
FR2624501A1 FR8816114A FR8816114A FR2624501A1 FR 2624501 A1 FR2624501 A1 FR 2624501A1 FR 8816114 A FR8816114 A FR 8816114A FR 8816114 A FR8816114 A FR 8816114A FR 2624501 A1 FR2624501 A1 FR 2624501A1
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France
Prior art keywords
transport rollers
glass sheets
oven
tempering
hot zone
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.)
Pending
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FR8816114A
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English (en)
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Saint Gobain Vitrage SA
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Saint Gobain Vitrage SA
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Publication date
Application filed by Saint Gobain Vitrage SA filed Critical Saint Gobain Vitrage SA
Publication of FR2624501A1 publication Critical patent/FR2624501A1/fr
Priority to EP19890403280 priority Critical patent/EP0375484A1/fr
Priority to FI895854A priority patent/FI895854A0/fi
Priority to JP31789289A priority patent/JPH02188434A/ja
Pending legal-status Critical Current

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    • 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
    • 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
    • C03B35/16—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by roller conveyors
    • C03B35/165—Supports or couplings for roller ends, e.g. trunions, gudgeons
    • 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
    • C03B35/16—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by roller conveyors
    • C03B35/18—Construction of the conveyor rollers ; Materials, coatings or coverings thereof
    • C03B35/181—Materials, coatings, loose coverings or sleeves thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
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  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
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  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
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Abstract

L'invention concerne l'utilisation de carbure de silicium pour la réalisation de rouleaux de transport pour la zone chaude d'un four de trempe et/ou de bombage de feuilles de verre.

Description

ROULEAUX DE TRANSPORT POUR LA ZONE CHAUDE
D'UN FOUR DE TREMPE ET/OU DE BOMBAGE
DE FEUILTL DE VERRE
L'invention concerne un rouleau de transport pour la zone chaude de fours horizontaux pour feuilles de verre notamment pour fours de trempe et/ou de bombage, ainsi qu'un four horizontal équipé d'un convoyeur constitué par de tels rouleaux de transport et prévu pour le réchauffage de feuilles de verre jusqu'à la température de trempe et/ou
de bombage.
Les rouleaux de transport connus ne sont pas sans défaut que ce soit du point de vue de leur comportement dans la zone de leur logement dans les paliers que celui dans la zone de contact avec les feuilles de verre. Ainsi les rouleaux de transport en dioxyde de silicium peuvent conduire après un certain temps d'utilisation à un marquage des feuilles de verre dû à de petites bulles présentes dans
le corps du rouleau et émergeant à la surface de celui-ci.
Pour remédier à cet inconvénient il est connu de munir les rouleaux de transport d'un revêtement ne formant pas de bulles tel que l'oxyde d'aluminium, l'oxyde de zirconium, le silicate de zirconium ou le dioxyde de silicium (DE-A-1
247 567).
Un autre défaut des rouleaux de transport connus
vient de ce que leur résistance à l'abrasion est insuffi-
sante pour les types usuels de paliers et/ou d'entraînement -2représentés et décrits par exemple dans les publications DE-23 19 049 et EP 51 539. Il est certes connu du brevet EP
51 539 de munir autour de leurs points critiques les rou-
leaux de transport en quartz fritté d'une couche vitreuse résistante aux frottements obtenue au moyen d'une fusion localisée de la surface. Toutefois, dans de nombreux cas, la résistance aux frottements de cette couche est encore insuffisante. Un inconvénient supplémentaire des rouleaux de
transport connus est qu'en raison de leur propriété de ré-
sistance mécanique il apparaît un certain bombage trans-
versal élastique voir sous certaines conditions définitif.
Ce bombage transversal a un effet défavorable sur la qua-
lité optique des feuilles de verre. Du fait que les rou-
leaux de transport sont montés sur des supports placés de façon usuelle à l'extérieur du four et ne sont pas soutenus entre les paliers de support, ils doivent présenter un diamètre relativement grand si on veut éviter ces bombages transversaux. Cette valeur élevée du diamètre des rouleaux de transport a pour conséquence une distance relativement grande entre les rouleaux de transport et par conséquence entre les lignes de soutien successives des feuilles de
verre, de telle sorte qu'il en résulte un danger de défor-
mation des feuilles de verre entre ces lignes de soutien
par affaissement dû au poids propre des feuilles de verre.
L'invention a pour but un rouleau de transport pour convoyeur de fours horizontaux pour feuilles de verre qui par rapport aux rouleaux connus présente une résistance
à l'abrasion mécanique plus élevée, un comportement amé-
lioré vis-à-vis du verre chaud et une moindre tendance à la déformation. Selon l'invention, il est proposé d'utiliser dans la zone chaude de fours horizontaux pour feuilles de verre des rouleaux de transport exclusivement ou essentiellement
en carbure de silicium.
Il est apparu que des rouleaux de transport en carbure de silicium satisfont toutes les exigences ci-dessus relatées. En raison de la grande dureté de ce - 3 - matériau, les rouleaux de transport selon l'invention ont une résistance à l'abrasion exceptionnellement élevée, de
sorte qu'ils peuvent être entraînés directement par fric-
tion pendant une période d'utilisation très longue. De plus, le carbure de silicium n'est pas mouillé par le verre fondu et au contraire des matériaux à base d'oxyde ne colle
pas au verre ramolli, de sorte que sous cet aspect égale-
ment les rouleaux selon l'invention présentent un avantage essentiel par rapport aux rouleaux connus de l'art. De plus, la dilatation élastique du carbure de silicium est nettement inférieure à celle des matériaux habituellement
utilisés, ce qui diminue le danger d'un bombage transver-
sal. Cela signifie que pour une même longueur de rouleau de transport, le diamètre d'un rouleau en carbure de silicium peut être jusqu'à 50 % plus petit. Par conséquence, les
rouleaux de transport selon l'invention peuvent être dis-
posés de façon plus rapprochée les uns des autres, ce qui conduit à une diminution du risque de dégradation de la
qualité optique.
Par rapport aux rouleaux de transport connus de l'art, les rouleaux de transport en carbure de silicium présentent toutefois une conductivité thermique accrue de sorte que les pertes thermiques sont plus grandes si les paliers sont positionnés en dehors du four. Mais on peut y remédier si conformément à un développement avantageux de l'invention, on choisit d'opérer avec des paliers sis dans
l'enceinte chaude du four et donc avec des rouleaux dis-
posés sur toute leur longueur dans le four. Dans ce but, il est particulièrement avantageux d'utiliser des paliers à gaz tels que ceux décrits dans la demande de brevet EP 88 402447.2. La surface de glissement d'un tel palier à gaz
est munie d'orifices d'émission d'un gaz sous pression no-
tamment de l'air qui permet la formation d'un film gazeux
entre la coquille support et le rouleau de transport.
L'accouplement des rouleaux de transport au dispositif d'entraînement commun est obtenu de préférence de la façon décrite dans la demande de brevet EP 88.402447.2 o il est proposé un accouplement de chaque rouleau de transport à un arbre d'entraînement disposé à l'extérieur du four au moyen - 4 - d'une tige d'accouplement traversant la paroi du four qui présente un diamètre plus petit que celui du rouleau et qui
est accouplée de façon articulée à la fois à l'arbre d'en-
traînement et au rouleau de transport.
- Pour l'invention, on peut utiliser tels quels des tubes en carbure de silicium technique obtenus par des
procédés connus de cet art et disponibles dans le commerce.
Par carbure de silicium technique, on entend un matériau qui se compose pour l'essentiel de carbure de silicium, mais qui peut contenir de petites quantités d'additifs et/ou d'impuretés qui lui confèrent en règle générale une couleur sombre. Ces tubes sont obtenus à partir de corps cylindriques pleins ou creux, rectifiés au diamètre voulu dont la surface est polie de façon appropriée de sorte qu'ils peuvent être posés directement sur les paliers à gaz. -5 -
REVEDICATIONS
1. Rouleau de transport pour la zone chaude d'un four horizontal pour feuilles de verre, notamment un four de trempe et/ou de bombage, caractérisé en ce qu'il est constitué exclusivement ou essentiellement en carbure- de silicium. 2. Four horizontal avec un convoyeur de transport formé de rouleaux pour le réchauffage de feuilles de verre à la température de bombage et/ou de trempe, caractérisé en
ce que les rouleaux de transport sont constitués exclusi-
vement ou essentiellement en carbure de silicum et sont
montés sur des paliers disposés à l'intérieur du four.
3. Four horizontal selon la revendication 2, ca-
ractérisé en ce que les rouleaux de transport sont montés sur des paliers à gaz dont les surfaces de glissement sont
munies d'orifices d'émission d'un gaz sous pression, no-
tamment de l'air, servant à la formation de films gazeux
entre les coquilles de support et les rouleaux.
FR8816114A 1987-12-14 1988-12-08 Rouleaux de transport pour la zone chaude d'un four de trempe et/ou de bombage de feuilles de verre Pending FR2624501A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19890403280 EP0375484A1 (fr) 1988-12-08 1989-11-28 Rouleaux de transport pour la zone chaude d'un four de trempe et/ou de bombage de feuilles de verre
FI895854A FI895854A0 (fi) 1988-12-08 1989-12-07 Transportrullar foer det heta zonet av ett haerdnings- eller kuperingsugn foer glasskivor.
JP31789289A JPH02188434A (ja) 1988-12-08 1989-12-08 高温領域でガラス板を移送するローラ，およびこれを備えた水平炉

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62315595A JPH01257355A (ja) 1987-12-14 1987-12-14 マイクロ波モノリシックｉｃ

Publications (1)

Publication Number Publication Date
FR2624501A1 true FR2624501A1 (fr) 1989-06-16

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ID=18067243

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FR888816144A Expired - Fee Related FR2624654B1 (fr) 1987-12-14 1988-12-08 Circuit integre monolithique micro-ondes et procede de fabrication

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FR888816144A Expired - Fee Related FR2624654B1 (fr) 1987-12-14 1988-12-08 Circuit integre monolithique micro-ondes et procede de fabrication

Country Status (4)

Country Link
US (2) US4956697A (fr)
JP (1) JPH01257355A (fr)
FR (2) FR2624501A1 (fr)
GB (1) GB2213638B (fr)

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Also Published As

Publication number Publication date
FR2624654A1 (fr) 1989-06-16
US4956697A (en) 1990-09-11
GB8823335D0 (en) 1988-11-09
JPH01257355A (ja) 1989-10-13
GB2213638B (en) 1991-11-06
US5045503A (en) 1991-09-03
GB2213638A (en) 1989-08-16
FR2624654B1 (fr) 1992-06-19

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