FR2539060A1 - Method for forming sheet metal by flow turning and application to the manufacture of mass-produced volume reflectors - Google Patents

Method for forming sheet metal by flow turning and application to the manufacture of mass-produced volume reflectors Download PDF

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Publication number
FR2539060A1
FR2539060A1 FR8300345A FR8300345A FR2539060A1 FR 2539060 A1 FR2539060 A1 FR 2539060A1 FR 8300345 A FR8300345 A FR 8300345A FR 8300345 A FR8300345 A FR 8300345A FR 2539060 A1 FR2539060 A1 FR 2539060A1
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FR
France
Prior art keywords
wheel
reflectors
manufacture
application
sheet metal
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.)
Granted
Application number
FR8300345A
Other languages
French (fr)
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FR2539060B1 (en
Inventor
Jean-Yves Repussard
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.)
Thomson-Brandt SA
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Thomson-Brandt 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 Thomson-Brandt SA filed Critical Thomson-Brandt SA
Priority to FR8300345A priority Critical patent/FR2539060B1/en
Publication of FR2539060A1 publication Critical patent/FR2539060A1/en
Application granted granted Critical
Publication of FR2539060B1 publication Critical patent/FR2539060B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • B21D22/16—Spinning over shaping mandrels or formers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • B21D53/883—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards reflectors

Abstract

The present invention relates to a method for forming prepainted sheet metal by flow turning. It makes it possible to reduce the manufacturing costs of reflectors of all types such as parabolic antennas or reflector stiffeners. To this end, a protective film is placed between the flow turning roller and the part. It is also possible to use a roller made of soft material.

Description

PROCEDE DE FORMAGE DE TOLES PAR
FLUOTOURNAGE ET APPLICATION A LA FABRICATION
DE REFLECTEURS VOLUMIQUES DE SERINE. METHOD FOR FORMING SHEETS BY
FLUOTOURNAGE AND APPLICATION TO MANUFACTURE
VOLUME REFLECTORS SYSTEMES.

La présente invention concerne un procédé de formage de tôles par fluotournage. Elle trouve son application notamment pour la fabrication de réflecteurs volumiques de série. The present invention relates to a sheet forming process by flow spinning. It finds its application in particular for the manufacture of series volume reflectors.

Les réflecteurs volumiques, comme les antennes de forme parabolique, sont fabriquées dans une tôle mince. Dans le cas des antennes de réception d'émissions par satellites, on doit sauvegarder à la fois une grande précision dans la construction mécanique et un faible coût. De telles antennes sont utilisées notamment par des particuliers pour recevoir des émissions de télévision par satellite géostationnaire. L'antenne doit, chez le particulier, être orientée une fois pour toutes. La liaison de l'antenne à son support orientable est faite par l'intermédiaire d'un raidisseur qui est décrit dans la demande de brevet n0 2 501 421 déposée le 6 mars 1981 au nom de la demanderesse. On y a décrit en particulier un procédé de fabrication du raidisseur par fluoprojection ou fluotournage.Un tel procédé présente les avantages d'être rapide et peu coûteuse et de réaliser la forme de pièce désirée avec une grande précision. Mais il faut, après le formage par fluotournage, réaliser une protection de la pièce formée par exemple avec une enduction thermoplastique ou encore avec une peinture étanche isolant la tôle métallique des agents atmosphériques. Ce peut être aussi une simple couche de pré laquage. Volume reflectors, like parabolic antennas, are made of thin sheet metal. In the case of antennas for receiving satellite broadcasts, both high precision in mechanical engineering and low cost must be safeguarded. Such antennas are used in particular by individuals to receive television broadcasts by geostationary satellite. The antenna should, in the home, be oriented once and for all. The antenna is connected to its adjustable support by means of a stiffener which is described in patent application No. 2 501 421 filed on March 6, 1981 in the name of the applicant. There has been described in particular a method of manufacturing the stiffener by fluorescence or flow forming. Such a method has the advantages of being quick and inexpensive and of producing the desired shape of part with great precision. However, after forming by flow spinning, it is necessary to protect the formed part, for example with a thermoplastic coating or with a waterproof paint insulating the metal sheet from atmospheric agents. It can also be a simple layer of pre-lacquering.

La présente invention permet d'utiliser des tôles préparées à l'avance qui sont vendues en grandes séries par leurs fabricants et ainsi de diminuer le coût de fabrication des pièces formées. En effet, elle concerne un procédé de formage de tôles par fluotournage qui part d'une tôle plate préparée d'origine et permet d'obtenir la pièce formée en adaptant la pression de fluotournage en fonction de la résistance mécanique de la couche de préparation.  The present invention makes it possible to use sheets prepared in advance which are sold in large series by their manufacturers and thus to reduce the cost of manufacturing the formed parts. In fact, it relates to a process for forming sheets by flow forming which starts from a flat sheet originally prepared and makes it possible to obtain the part formed by adapting the pressure of flow forming as a function of the mechanical strength of the preparation layer.

D'autres caractéristiques et avantages de la présente invention sont fournis dans la description et la figure unique annexée. Other characteristics and advantages of the present invention are provided in the description and the attached single figure.

La figure unique représente un détail du tour au cours du procédé de formage selon l'invention. On peut y voir l'axe 1 du tour avec le porte outil 2 et un mandrin 3 qui représente la forme de la pièce que l'on désire former. La tôle 4,5- qui était un disque à l'origine comporte une partie 5 déjà appliquée sur le mandrin 3 et donc formée et une partie 4 en forme de couronne. The single figure shows a detail of the lathe during the forming process according to the invention. We can see the axis 1 of the lathe with the tool holder 2 and a mandrel 3 which represents the shape of the part that we want to form. The sheet 4,5- which was originally a disc has a part 5 already applied to the mandrel 3 and therefore formed and a part 4 in the form of a crown.

La tôle 4,5 est maintenue à force sur le mandrin par la contrepoupée 6 et son axe 7. Le tour comporte aussi, ainsi qu'il est connu, une molette 9 sur un axe 8 actionnée par un moteur. La molette 9 et le mandrin 3 tournent en sens contraires l'un de l'autre. The sheet 4.5 is held by force on the mandrel by the tailstock 6 and its axis 7. The lathe also includes, as is known, a wheel 9 on an axis 8 actuated by a motor. The dial 9 and the mandrel 3 rotate in opposite directions to each other.

Dans le procédé de l'invention, la tôle est initialement recouverte d'une couche de préparation qui peut servir de protection contre les agents atmosphériques. Ce peut être une couche d'une peinture, une anodisation ou tout traitement de surface. Un fluotournage classique ne permet pas d'obtenir le résultat de l'invention, à savoir une pièce formée protégée, car les pressions appliquées sont trop fortes et la peinture, la couche de préparation ou le film protecteur seraient arrachés. Pour éviter cela, l'invention fait une modulation des pressions locales appliquées par la molette sur la tôle en fonction de la résistance mécanique de la couche de préparation. Pour cela, on dispose de plusieurs paramètres qui sont notamment:
- le module d'élasticité du matériau constituant la molette,
- le diamètre de la molette,
- la vitesse de rotation relative de la molette et du mandrin,
le refroidissement de la tôle au point de fluotournage,
- l'interposition d'un film de protection du revêtement de surface de la tôle.In the process of the invention, the sheet is initially covered with a preparation layer which can serve as protection against atmospheric agents. It can be a layer of paint, anodizing or any surface treatment. A conventional flow turning does not make it possible to obtain the result of the invention, namely a protected formed part, because the pressures applied are too high and the paint, the preparation layer or the protective film would be torn off. To avoid this, the invention modulates the local pressures applied by the dial on the sheet according to the mechanical strength of the preparation layer. For this, we have several parameters which are in particular:
- the modulus of elasticity of the material constituting the wheel,
- the diameter of the wheel,
- the relative speed of rotation of the wheel and the mandrel,
sheet metal cooling at the flow turning point,
- the interposition of a protective film for the surface coating of the sheet.

Pour mettre en oeuvre le procédé de l'invention, la molette 9 est réalisée en matière plastisque du genre nylon ou téflon. To implement the method of the invention, the wheel 9 is made of plastic material of the nylon or Teflon type.

Le film protecteur prévu peut être constitué par une feuille plastique qui s'interpose entre la tôle par la molette pour éviter d'abîmer le revêtement de surface de la tôle.  The protective film provided may consist of a plastic sheet which is interposed between the sheet by the wheel to avoid damaging the surface coating of the sheet.

Claims (8)

REVENDICATIQNS 1. Procédé de formage de tôles par fluotournage-repoussage, caractérisé en ce que la tôle plate d'origine est préparée et en ce que la pression locale de fluotournage est prédéterminée en fonction de la résistance mécanique de la couche de préparation. 1. A method of forming sheets by flow-spinning-spinning, characterized in that the original flat sheet is prepared and in that the local pressure of flow-forming is predetermined as a function of the mechanical strength of the preparation layer. 2. Procédé selon la revendication 1, caractérisé en ce que la pression locale prédéterminée est fixée par le choix du module d'élasticité de la molette, son diamètre et/ou sa vitesse de rotation. 2. Method according to claim 1, characterized in that the predetermined local pressure is fixed by the choice of the modulus of elasticity of the wheel, its diameter and / or its speed of rotation. 3. Procédé selon la revendication 1 ou 2, caractérisé en ce que on procède à un arrosage refroidissant de la molette. 3. Method according to claim 1 or 2, characterized in that one carries out a cooling watering of the wheel. 4. Procédé selon la revendication 1, caractérisé en ce que la tôle est recouverte d'un film protecteur lors de l'opération. 4. Method according to claim 1, characterized in that the sheet is covered with a protective film during the operation. 5. Procédé selon la revendication 4, caractérisé en ce que le film protecteur est un film plastique interposé entre la molette et la couche de préparation. 5. Method according to claim 4, characterized in that the protective film is a plastic film interposed between the wheel and the preparation layer. 6. Procédé selon la revendication 2, caractérisé en ce que la molette est en plastique du genre téflon. 6. Method according to claim 2, characterized in that the wheel is plastic of the Teflon type. 7. Procédé selon la revendication 2, caractérisé en ce que la molette est en plastique du genre nylon. 7. Method according to claim 2, characterized in that the wheel is of nylon type plastic. 8. Application du procédé selon l'invention à la fabrication de réflecteurs métalliques.  8. Application of the method according to the invention to the manufacture of metal reflectors.
FR8300345A 1983-01-11 1983-01-11 METHOD FOR FORMING SHEETS BY FLUOTOURNING AND APPLICATION TO THE MANUFACTURE OF SERIAL VOLUME REFLECTORS Expired FR2539060B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8300345A FR2539060B1 (en) 1983-01-11 1983-01-11 METHOD FOR FORMING SHEETS BY FLUOTOURNING AND APPLICATION TO THE MANUFACTURE OF SERIAL VOLUME REFLECTORS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8300345A FR2539060B1 (en) 1983-01-11 1983-01-11 METHOD FOR FORMING SHEETS BY FLUOTOURNING AND APPLICATION TO THE MANUFACTURE OF SERIAL VOLUME REFLECTORS

Publications (2)

Publication Number Publication Date
FR2539060A1 true FR2539060A1 (en) 1984-07-13
FR2539060B1 FR2539060B1 (en) 1985-06-07

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FR8300345A Expired FR2539060B1 (en) 1983-01-11 1983-01-11 METHOD FOR FORMING SHEETS BY FLUOTOURNING AND APPLICATION TO THE MANUFACTURE OF SERIAL VOLUME REFLECTORS

Country Status (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2575537A1 (en) * 1985-01-02 1986-07-04 Geru Claude Accessory, called "reduction plate", intended to ensure the connection of two pipelines of different diameter, and method for producing this accessory
EP1477245A1 (en) * 2002-02-19 2004-11-17 Honda Giken Kogyo Kabushiki Kaisha Successive forming device

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1175808A (en) * 1956-05-28 1959-04-02 Deep drawing process for sheets
FR1241637A (en) * 1958-11-28 1960-09-16 Ici Ltd Coating compositions
FR1252874A (en) * 1960-02-05 1961-02-03 Uddeholms Ab Cold machining process for metals
US3314143A (en) * 1964-11-03 1967-04-18 Robert E Mcdonald Method for producing tube shells
FR1565532A (en) * 1968-01-11 1969-05-02
DE2927604A1 (en) * 1979-07-07 1981-01-15 Heinz F Brockhoff Metal working machine with detection of workpiece thickness - using calculated gap between piston rod end block and forming tool
FR2501421A1 (en) * 1981-03-06 1982-09-10 Thomson Brandt Ground-based antenna for TV reception from geostationary satellite - comprises detector at focal point of parabolic reflector mounted on adjustable stiffening member and bracket
EP0062685A1 (en) * 1981-04-11 1982-10-20 Leifeld GmbH & Co. Method of processing a numerically supervised and controlled spinning machine, and spinning machine for carrying out this method

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1175808A (en) * 1956-05-28 1959-04-02 Deep drawing process for sheets
FR1241637A (en) * 1958-11-28 1960-09-16 Ici Ltd Coating compositions
GB872581A (en) * 1958-11-28 1961-07-12 Ici Ltd Coating compositions for use in sheet metal working
FR1252874A (en) * 1960-02-05 1961-02-03 Uddeholms Ab Cold machining process for metals
US3314143A (en) * 1964-11-03 1967-04-18 Robert E Mcdonald Method for producing tube shells
FR1565532A (en) * 1968-01-11 1969-05-02
DE2927604A1 (en) * 1979-07-07 1981-01-15 Heinz F Brockhoff Metal working machine with detection of workpiece thickness - using calculated gap between piston rod end block and forming tool
FR2501421A1 (en) * 1981-03-06 1982-09-10 Thomson Brandt Ground-based antenna for TV reception from geostationary satellite - comprises detector at focal point of parabolic reflector mounted on adjustable stiffening member and bracket
EP0062685A1 (en) * 1981-04-11 1982-10-20 Leifeld GmbH & Co. Method of processing a numerically supervised and controlled spinning machine, and spinning machine for carrying out this method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2575537A1 (en) * 1985-01-02 1986-07-04 Geru Claude Accessory, called "reduction plate", intended to ensure the connection of two pipelines of different diameter, and method for producing this accessory
EP1477245A1 (en) * 2002-02-19 2004-11-17 Honda Giken Kogyo Kabushiki Kaisha Successive forming device
EP1477245A4 (en) * 2002-02-19 2007-03-21 Honda Motor Co Ltd Successive forming device

Also Published As

Publication number Publication date
FR2539060B1 (en) 1985-06-07

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