EP0297219A1 - Manufacturing method of a flexible electrical cable - Google Patents
Manufacturing method of a flexible electrical cable Download PDFInfo
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- EP0297219A1 EP0297219A1 EP88105170A EP88105170A EP0297219A1 EP 0297219 A1 EP0297219 A1 EP 0297219A1 EP 88105170 A EP88105170 A EP 88105170A EP 88105170 A EP88105170 A EP 88105170A EP 0297219 A1 EP0297219 A1 EP 0297219A1
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- conductor
- fine wires
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- screen
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/02—Stranding-up
- H01B13/0292—After-treatment
Definitions
- the present invention relates to a method of manufacturing a flexible electric cable consisting of a stranded conductor formed of fine wires, of diameter less than 0.5 mm, made of aluminum or aluminum alloy, and coated with a polymer material, or made up of one or more insulated conductors, covered with an electrical screen formed of fine wires of diameter less than 0.5 mm, made of aluminum or aluminum alloy, wrapped or braided around them, this screen can be surrounded at least one insulating layer of polymer material.
- Such cables are particularly used in the wiring of aircraft or spacecraft. They usually consist of a conductive core made of a strand of fine wires and an insulation formed from one or more layers of one or more polymeric materials. These materials can be either directly extruded on the conductive core, or pre-formed into strips which are then wound helically around the conductive core. This insulation is itself frequently coated with a layer of enamel obtained by firing a varnish.
- the insulated conductor, or a bundle of insulated conductors can be coated with an electric screen produced using fine wires, either by wrapping or by braiding. This electrical screen is generally coated with an electrical insulator which can be extruded or taped and, optionally, covered with an enamel.
- the insulating polymers and enamels used are frequently fluorinated resins or polyimides, or any other material retaining good mechanical and electrical insulation properties at operating temperatures above about 150 ° C.
- the object of the present invention is to enable the manufacture of flexible electrical cables comprising aluminum or aluminum alloy wires with a diameter of less than 0.5 mm, and which can go down to approximately 0.05 mm, by reducing to a very large extent the risk of breakage during stranding, braiding, covering or insulation operations.
- the method according to the invention is characterized in that one carries out the operations of stranding the fine wires forming the conductor, or of wrapping or braiding the wires surrounding the insulated conductor (s) and forming the electric screen, using fine wires not annealed or only partially annealed, then in that the stranded conductor or the gimped or braided electrical screen is subjected to at least one final annealing.
- the insulation is completed with a layer of varnish based on polymeric material after stranding the fine wires forming the conductor and applying the insulation, or after wrapping or braiding the wires forming the electrical screen and applying the insulator, the insulated conductor or the insulated electrical screen is coated with a layer of varnish based on polymer material, then the insulated conductor or the insulated screen, coated with varnish, is subjected to a heat treatment simultaneously ensuring the annealing of the conductor or of the electric screen and cooking of the varnish.
- the insulated conductor or the insulated electrical screen is annealed simultaneously and the varnish is cured by passing through an enclosure at 450 ° C for approximately 30 seconds.
- the isolated conductor or the electrical screen is annealed in an enclosure whose temperature is at least 240 ° C.
- the process of the invention applies particularly well to cables comprising fine wires of aluminum or aluminum alloy, covered with a layer of nickel, these wires being particularly appreciated by users when the conductor (s), or the screen, of the cables must be joined at their ends to electrical elements such as contacts or other cables, by crimping or soldering.
- the nickel layer eliminates the bad contacts inherent in the surface oxidation of aluminum. It also makes it possible to obtain a good bonding of the soft solder with tin or silver.
- the wires In the not fully annealed state, the wires have, as is known, mechanical properties, and in particular a tensile strength, greater than those presented by these same wires in the perfectly annealed state.
- the annealing heat treatment necessary to obtain the best electrical conductivity and all the flexibility required by the cables, is carried out after the stranding and insulation of the conductor, or after the wrapping or braiding operation.
- the annealed, semi-cold worked and cold worked metallurgical states have a variable definition depending on the suppliers of the wires and the countries. In France, for example, these states are defined for aluminum or aluminum alloy wires by standard NF A 02-006 and the guaranteed values of the mechanical characteristics are indicated for each state by the supplier. In any case, there are always for each aluminum or aluminum alloy wire several metallurgical states apart from the annealed state such that the value of the breaking stress is considerably greater than the value observed in the annealed condition.
- the heat treatment which makes it possible to obtain a perfectly annealed wire depends on the purity of the metal or on the composition of the alloy. It also depends on the metallurgical states and the heat treatments that the metal underwent in the manufacturing phases which preceded the annealing.
- This heat treatment is characterized by the temperature to which the wire must be brought and the duration of maintenance at this temperature. For aluminum and many alloys, the temperature must be at least 240 ° C and in this case the duration can be several hours. But if we use a higher temperature, for example higher at 350 ° C, the time can be reduced to a fraction of a second.
- the insulators used in flexible cables are capable of withstanding such temperatures for periods which can range from a few seconds to several hours depending on the insulation material used.
- the applicant has produced a stranded conductor made up of 19 wires having a diameter of 0.15 mm. These 131050 aluminum wires, defined by French standard NF A 02-104, were covered with a layer of nickel approximately 1 micron thick. They were stranded while they were in the work-hardened metallurgical state corresponding to the designation H 26 of the French standard NF A 02-006. In this state, the breaking stress was greater than 160 MPa and the elongation at break was approximately 1%.
- the stranded conductor was isolated by two layers of polyimide tape sold under the Kapton brand by DUPONT de NEMOURS. These ribbons were 25 microns thick.
- This insulation was coated with a layer of varnish consisting of an aqueous emulsion of polytetrafluoroethylene.
- the conductor thus coated then passed at a speed of 20 m / min in an enclosure heated to 450 ° C.
- the residence time in the enclosure of each part of the insulated conductor was approximately 30 seconds.
- two conductors thus produced were twisted together to form a pair.
- a braid made up of 16 spindles of 3 wires in aluminimum 131050 coated with nickel as indicated above.
- the diameter of these wires was 0.12 mm. They were used in a partially hardened metallurgical state corresponding to the designation H 24 of the French standard NF A 02-006, the more hardened metallurgical state H26 not being favorable for the good constitution of a braid.
- H 24 the breaking stress of each wire was between 140 and 150 MPa.
- the elongation at break was between 3 and 4%.
- the braid was then insulated with two layers of Kapton tape and a layer of fluoride varnish as indicated above.
- the cable thus produced then passed through the same enclosure and with the same operating conditions as indicated above.
- the tests carried out on threads extracted from the braid after this treatment have given the same results, that is to say a breaking stress of less than 130 MPa and an elongation at break of more than 12%, thus guaranteeing the flexibility and the required conductivity.
- the value of the temperature and the duration of stay in the enclosure can vary within wide proportions and nevertheless make it possible to obtain annealing of the stranded conductor or of the screen. This allows among other things to choose these operating conditions taking into account other constraints related in particular to the characteristics of the insulating materials used.
- the temperature of the enclosure was set at the high value imposed by the cooking of the fluorinated varnish.
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Abstract
Procédé de fabrication d'un câble électrique souple constitué d'un conducteur toronné formé de fils fins, de diamètre inférieure à 0,5 mm, en aluminium ou alliage d'aluminium, revêtu d'un matériau polymère, ou constitué d'un ou plusieurs conducteurs isolés, revêtus d'un écran électrique formé de fils fins de diamètre inférieur à 0,5 mm, en aluminium ou alliage d'aluminium, guipés ou tressés autour d'eux, cet écran pouvant être entouré d'au moins une couche isolante en matériau polymère. On effectue les opération de toronnage des fils fins formant le conducteur, ou bien de guipage ou de tressage des fils entourant le ou les conducteurs isolés et formant l'écran électrique, en utilisant des fils fins non recuits ou seulement partiellement recuits, puis l'on soumet le conducteur toronné ou l'écran électrique guipé ou tressé à au moins un recuit final. Application notamment à la fabrication de câbles électriques souples facilement sertissables ou brasables, comprenant des fils fins d'aluminium ou alliage d'aluminium nickelés.Method of manufacturing a flexible electric cable consisting of a stranded conductor formed of fine wires, of diameter less than 0.5 mm, made of aluminum or aluminum alloy, coated with a polymer material, or consisting of or several insulated conductors, covered with an electrical screen formed of fine wires of diameter less than 0.5 mm, of aluminum or aluminum alloy, wrapped or braided around them, this screen can be surrounded by at least one layer insulation in polymer material. The operations of stranding the fine wires forming the conductor, or wrapping or braiding the wires surrounding the insulated conductor (s) and forming the electrical screen, are carried out using fine wires which are not annealed or only partially annealed, then the the stranded conductor or the gimped or braided electrical screen is subjected to at least one final annealing. Application in particular to the manufacture of flexible electric cables easily crimpable or solderable, comprising fine wires of nickel-plated aluminum or aluminum alloy.
Description
La présente invention concerne un procédé de fabrication d'un câble électrique souple constitué d'un conducteur toronné formé de fils fins, de diamètre inférieure à 0,5 mm, en aluminium ou alliage d'aluminium, et revêtu d'un matériau polymère, ou constitué d'un ou plusieurs conducteurs isolés, revêtus d'un écran électrique formé de fils fins de diamètre inférieur à 0,5 mm, en aluminium ou alliage d'aluminium, guipés ou tressés autour d'eux, cet écran pouvant être entouré d'au moins une couche isolante en matériau polymère.The present invention relates to a method of manufacturing a flexible electric cable consisting of a stranded conductor formed of fine wires, of diameter less than 0.5 mm, made of aluminum or aluminum alloy, and coated with a polymer material, or made up of one or more insulated conductors, covered with an electrical screen formed of fine wires of diameter less than 0.5 mm, made of aluminum or aluminum alloy, wrapped or braided around them, this screen can be surrounded at least one insulating layer of polymer material.
De tels câbles sont particulièrement utilisés dans le câblage des aéronefs ou des engins spatiaux. Ils sont habituellement constitués d'une âme conductrice faite d'un toron de fils fins et d'une isolation formée d'une ou plusieurs couches d'un ou de plusieurs matériaux polymères. Ces matériaux peuvent être, soit directement extrudés sur l'âme conductrice, soit préablement façonnés en rubans qui sont ensuite enroulés hélicoïdalement autour de l'âme conductrice. Cette isolation est elle-même fréquemment revêtue d'une couche d'émail obtenue par cuisson d'un vernis. Le conducteur isolé, ou un faisceau de conducteurs isolés, peut être revêtu d'un écran électrique réalisé à l'aide de fils fins,soit par guipage, soit par tressage. Cet écran électrique est généralement revêtu d'un isolant électrique qui peut être extrudé ou rubané et, éventuellement, recouvert d'un émail.Such cables are particularly used in the wiring of aircraft or spacecraft. They usually consist of a conductive core made of a strand of fine wires and an insulation formed from one or more layers of one or more polymeric materials. These materials can be either directly extruded on the conductive core, or pre-formed into strips which are then wound helically around the conductive core. This insulation is itself frequently coated with a layer of enamel obtained by firing a varnish. The insulated conductor, or a bundle of insulated conductors, can be coated with an electric screen produced using fine wires, either by wrapping or by braiding. This electrical screen is generally coated with an electrical insulator which can be extruded or taped and, optionally, covered with an enamel.
Les polymères isolants et les émaux utilisés sont fréquemment des résines fluorées ou des polyimides, ou tout autre matériau conservant de bonnes propriété mécaniques et d'isolement électrique à des températures de service supérieures à environ 150°C.The insulating polymers and enamels used are frequently fluorinated resins or polyimides, or any other material retaining good mechanical and electrical insulation properties at operating temperatures above about 150 ° C.
Pour obtenir des câbles souples et la plus faible résistance électrique, il est essentiel que le métal des conducteurs soit convenablement recuit. Mais, dans le cas des conducteurs comportant des fils fins, de diamètre inférieur à 0, 5 mm, il est connu que les fils recuits d'aluminium ou d'alliage d'aluminium sont fragiles et supportent mal les variations brusques des efforts qui leur sont appliqués au cours des opérations de toronnage, d'isolation ou de tressage, variations brusques dont il n'est pas possible de s'affranchir entièrement malgré le soin apporté lors des opérations de toronnage, de tressage, de guipage ou d'isolation. Il en résulte de nombreuses casses des fils au cours du cycle de fabrication, casses d'autant plus gênantes que pour obtenir la meilleure souplesse des câbles, on s'efforce d'augmenter le nombre des fils en diminuant leur diamètre.To obtain flexible cables and the lowest electrical resistance, it is essential that the metal of the conductors is properly annealed. However, in the case of conductors comprising fine wires, with a diameter of less than 0.5 mm, it is known that annealed wires of aluminum or aluminum alloy are fragile and do not tolerate sudden variations in the forces which their are applied during stranding, insulation or braiding operations, sudden variations which it is not possible to completely overcome despite the care taken during stranding, braiding, covering or insulation. This results in numerous breakages of the wires during the manufacturing cycle, breakages which are all the more troublesome since, in order to obtain the best flexibility of the cables, an effort is made to increase the number of wires by reducing their diameter.
La présente invention a pour but de permettre la fabrication de câbles électriques souples comportant des fils d'aluminium ou d'alliage d'aluminium de diamètre inférieur à 0,5 mm, et pouvant descendre jusqu'à environ 0,05 mm, en réduisant dans une très large mesure les risques de casse lors des opérations de toronnage, de tressage, de guipage ou d'isolation.The object of the present invention is to enable the manufacture of flexible electrical cables comprising aluminum or aluminum alloy wires with a diameter of less than 0.5 mm, and which can go down to approximately 0.05 mm, by reducing to a very large extent the risk of breakage during stranding, braiding, covering or insulation operations.
Le procédé selon l'invention est caractérisé en ce que l'on effectue les opérations de toronnage des fils fins formant le conducteur, ou bien de guipage ou de tressage des fils entourant le ou les conducteurs isolés et formant l'écran électrique, en utilisant des fils fins non recuits ou seulement partiellement recuits, puis en ce que l'on soumet le conducteur toronné ou l'écran électrique guipé ou tressé à au moins un recuit final.The method according to the invention is characterized in that one carries out the operations of stranding the fine wires forming the conductor, or of wrapping or braiding the wires surrounding the insulated conductor (s) and forming the electric screen, using fine wires not annealed or only partially annealed, then in that the stranded conductor or the gimped or braided electrical screen is subjected to at least one final annealing.
Il répond en outre de préférence à au moins l'une des caractéristiques suivantes :
- lorsque l'isolant est complété par une couche de vernis à base de matériau polymère après le toronnage des fils fins formant le conducteur et application de l'isolant, ou après le guipage ou le tressage des fils formant l'écran électrique et application de l'isolant, on enrobe le conducteur isolé ou l'écran électrique isolé d'une couche de vernis à base de matériau polymère, puis on soumet le conducteur isolé ou l'écran isolé, enrobés de vernis, à un traitement thermique assurant simultanément le recuit du conducteur ou de l'écran électrique et la cuisson du vernis.
- lorsque le vernis est à base de résines fluorées, on effectue simultanément le recuit du conducteur isolé ou de l'écran électrique isolé et la cuisson du vernis par passage dans une enceinte à 450°C pendant 30 secondes environ.
- on effectue le recuit du conducteur isolé ou de l'écran électrique dans une enceinte dont la température est d'au moins 240°C.It also preferably meets at least one of the following characteristics:
- when the insulation is completed with a layer of varnish based on polymeric material after stranding the fine wires forming the conductor and applying the insulation, or after wrapping or braiding the wires forming the electrical screen and applying the insulator, the insulated conductor or the insulated electrical screen is coated with a layer of varnish based on polymer material, then the insulated conductor or the insulated screen, coated with varnish, is subjected to a heat treatment simultaneously ensuring the annealing of the conductor or of the electric screen and cooking of the varnish.
- When the varnish is based on fluorinated resins, the insulated conductor or the insulated electrical screen is annealed simultaneously and the varnish is cured by passing through an enclosure at 450 ° C for approximately 30 seconds.
- the isolated conductor or the electrical screen is annealed in an enclosure whose temperature is at least 240 ° C.
Le procédé de l'invention s'applique particulièrement bien aux câbles comportant des fils fins d'aluminium ou d'alliage d'aluminium, recouverts d'une couche de nickel, ces fils étant particulièrement appréciés des utilisateurs lorsque le ou les conducteurs, ou l'écran, des câbles doivent être réunis à leur extrémité à des éléments électriques tels que des contacts ou d'autres câbles, par sertissage ou brasage. La couche de nickel élimine les mauvais contacts inhérents à l'oxydation superficielle de l'aluminium. Elle permet aussi d'obtenir un bon accrochage des brasures tendres à l'étain ou à l'argent.The process of the invention applies particularly well to cables comprising fine wires of aluminum or aluminum alloy, covered with a layer of nickel, these wires being particularly appreciated by users when the conductor (s), or the screen, of the cables must be joined at their ends to electrical elements such as contacts or other cables, by crimping or soldering. The nickel layer eliminates the bad contacts inherent in the surface oxidation of aluminum. It also makes it possible to obtain a good bonding of the soft solder with tin or silver.
Dans l'état non entièrement recuit, les fils possèdent comme il est connu des propriétés mécaniques, et en particulier une contrainte à la rupture, supérieures à celles que présentent ces mêmes fils dans l'état parfaitement recuit. Le traitement thermique de recuit, nécessaire pour obtenir la meilleure conductivité électrique et toute la souplesse requise par les câbles, est pratiqué après les opérations de toronnage et d'isolation du conducteur, ou après l'opération de guipage ou de tressage.In the not fully annealed state, the wires have, as is known, mechanical properties, and in particular a tensile strength, greater than those presented by these same wires in the perfectly annealed state. The annealing heat treatment, necessary to obtain the best electrical conductivity and all the flexibility required by the cables, is carried out after the stranding and insulation of the conductor, or after the wrapping or braiding operation.
Les états métallurgiques recuit, semi-écroui et écroui ont une définition variable selon les fournisseurs des fils et les pays. En France, par exemple, ces états sont définis pour les fils d'aluminium ou d'alliage d'aluminium par la norme NF A 02-006 et les valeurs garanties des caractéristiques mécaniques sont indiquées pour chaque état par le fournisseur. De toutes façons, il existe toujours pour chaque fil d'aluminium ou d'alliage d'aluminium plusieurs états métallurgiques en dehors de l'état recuit tels que la valeur de la contrainte à la rupture soit considérablement supérieure à la valeur observée dans l'état recuit.The annealed, semi-cold worked and cold worked metallurgical states have a variable definition depending on the suppliers of the wires and the countries. In France, for example, these states are defined for aluminum or aluminum alloy wires by standard NF A 02-006 and the guaranteed values of the mechanical characteristics are indicated for each state by the supplier. In any case, there are always for each aluminum or aluminum alloy wire several metallurgical states apart from the annealed state such that the value of the breaking stress is considerably greater than the value observed in the annealed condition.
Le traitement thermique qui permet d'obtenir un fil parfaitement recuit dépend de la pureté du métal ou de la composition de l'alliage. Il dépend aussi des états métallurgiques et des traitements thermiques qu'à subis le métal dans les phases de fabrication qui ont précédé le recuit. Ce traitement thermique est caractérisé par la température à laquelle doit être porté le fil et la durée de maintien à cette température. Pour l'aluminium et de nombreux alliages, la température doit être au moins égale à 240° C et dans ce cas la durée peut être de plusieurs heures. Mais si on utilise une température plus élevée, par exemple supérieure à 350° C, la durée peut être réduite à une fraction de seconde.The heat treatment which makes it possible to obtain a perfectly annealed wire depends on the purity of the metal or on the composition of the alloy. It also depends on the metallurgical states and the heat treatments that the metal underwent in the manufacturing phases which preceded the annealing. This heat treatment is characterized by the temperature to which the wire must be brought and the duration of maintenance at this temperature. For aluminum and many alloys, the temperature must be at least 240 ° C and in this case the duration can be several hours. But if we use a higher temperature, for example higher at 350 ° C, the time can be reduced to a fraction of a second.
Les isolants utilisés dans les câbles souples, particulièrement ceux destinés aux industries aéronautiques et spaciales, sont capables de supporter de telles températures pendant des durées qui peuvent aller de quelques secondes à plusieurs heures selon le matériau d'isolation utilisé.The insulators used in flexible cables, particularly those intended for the aeronautical and space industries, are capable of withstanding such temperatures for periods which can range from a few seconds to several hours depending on the insulation material used.
Ainsi il est possible de recuire le conducteur toronné et le guipage ou la tresse constituant l'écran lorsque ceux-ci sont revêtus de leur isolation. Ce recuit peut même être combiné avec l'opération de cuisson des vernis qui enduisent éventuellement la ou les couches d'isolant.Thus it is possible to anneal the stranded conductor and the wrapping or the braid constituting the screen when these are coated with their insulation. This annealing can even be combined with the operation of cooking varnishes which possibly coat the layer or layers of insulation.
A titre d'exemple, la demanderesse a réalisé un conducteur toronné constitué de 19 fils ayant un diamètre de 0,15 mm. Ces fils en aluminium 131050, défini par la norme française NF A 02-104, étaient recouverts d'une couche de nickel d'environ 1 micron d'épaisseur. Ils ont été toronnés alors qu'ils étaient dans l'état métallurgique écroui correspondant à la désignation H 26 de la norme française NF A 02-006. Dans cet état, la contrainte à la rupture était supérieure à 160 MPa et l'allongement à la rupture était d'environ 1 %. Le conducteur toronné a été isolé par deux couches de ruban polyimide vendu sous la marque Kapton par DUPONT de NEMOURS. Ces rubans avaient une épaisseur de 25 microns. Cette isolation a été revêtue d'une couche de vernis constitué d'une émulsion aqueuse de polytétrafluoroéthylène. Le conducteur ainsi revêtu a alors défilé à la vitesse de 20 m/mn dans une enceinte chauffée à 450° C. Le temps de séjour dans l'enceinte de chaque partie du conducteur isolé était d'environ 30 secondes. Ces conditions opératoires ont permis de cuire le vernis et de recuire les fils d'aluminium constituant le conducteur toronné. Après traitement les fils extraits du conducteur avaient un allongement à la rupture supérieur à 12 %. La contrainte à la rupture n'était pas supérieure à 130 MPa. Ces caractéristiques correspondent bien à un état métallurgique recuit garantissant la conductivité électrique et la souplesse requises.By way of example, the applicant has produced a stranded conductor made up of 19 wires having a diameter of 0.15 mm. These 131050 aluminum wires, defined by French standard NF A 02-104, were covered with a layer of nickel approximately 1 micron thick. They were stranded while they were in the work-hardened metallurgical state corresponding to the designation H 26 of the French standard NF A 02-006. In this state, the breaking stress was greater than 160 MPa and the elongation at break was approximately 1%. The stranded conductor was isolated by two layers of polyimide tape sold under the Kapton brand by DUPONT de NEMOURS. These ribbons were 25 microns thick. This insulation was coated with a layer of varnish consisting of an aqueous emulsion of polytetrafluoroethylene. The conductor thus coated then passed at a speed of 20 m / min in an enclosure heated to 450 ° C. The residence time in the enclosure of each part of the insulated conductor was approximately 30 seconds. These operating conditions made it possible to cure the varnish and to anneal the aluminum wires constituting the stranded conductor. After treatment, the wires extracted from the conductor had an elongation at break greater than 12%. The breaking stress was not more than 130 MPa. These characteristics correspond well to an annealed metallurgical state guaranteeing the required electrical conductivity and flexibility.
Dans une autre réalisation, deux conducteurs ainsi réalisés ont été torsadés ensemble pour former une paire. Sur cette paire a été appliquée une tresse constituée de 16 fuseaux de 3 fils en aluminimum 131050 revêtu de nickel comme indiqué ci-dessus. Le diamètre de ces fils était de 0,12 mm. Ils ont été utilisés dans un état métallurgique partiellement écroui correspondant à la désignation H 24 de la norme française NF A 02-006, l'état métallurgique H26 plus écroui n'étant pas favorable à la bonne constitution d'une tresse. Dans cet état H 24, la contrainte à la rupture de chaque fil était comprise entre 140 et 150 MPa. L'allongement à la rupture était compris entre 3 et 4 %. La tresse a ensuite été isolée par deux couches de ruban en Kapton et une couche de vernis fluoré comme indiqué ci-dessus. Le câble ainsi réalisé a alors défilé dans la même enceinte et avec les mêmes conditions opératoires qu'indiquées ci-dessus. Les essais pratiqués sur des fils extraits de la tresse après ce traitement ont donné les mêmes résultats, c'est-à-dire une contrainte à la rupture inférieure à 130 MPa et un allongement à la rupture supérieur à 12 %, garantissant ainsi la souplesse et la conductivité requises.In another embodiment, two conductors thus produced were twisted together to form a pair. On this pair was applied a braid made up of 16 spindles of 3 wires in aluminimum 131050 coated with nickel as indicated above. The diameter of these wires was 0.12 mm. They were used in a partially hardened metallurgical state corresponding to the designation H 24 of the French standard NF A 02-006, the more hardened metallurgical state H26 not being favorable for the good constitution of a braid. In this state H 24, the breaking stress of each wire was between 140 and 150 MPa. The elongation at break was between 3 and 4%. The braid was then insulated with two layers of Kapton tape and a layer of fluoride varnish as indicated above. The cable thus produced then passed through the same enclosure and with the same operating conditions as indicated above. The tests carried out on threads extracted from the braid after this treatment have given the same results, that is to say a breaking stress of less than 130 MPa and an elongation at break of more than 12%, thus guaranteeing the flexibility and the required conductivity.
Comme il a été indiqué plus haut, la valeur de la température et la durée de séjour dans l'enceinte peuvent varier dans de larges proportions et permettre néanmoins d'obtenir le recuit du conducteur toronné ou de l'écran. Ceci permet entre autres de choisir ces conditions opératoires en tenant compte d'autres contraintes liées en particulier aux caractéristiques des matériaux isolants utilisés. Dans les exemples ci-dessus, la température de l'enceinte a été fixée à la valeur élevée qu'imposait la cuisson du vernis fluoré.As indicated above, the value of the temperature and the duration of stay in the enclosure can vary within wide proportions and nevertheless make it possible to obtain annealing of the stranded conductor or of the screen. This allows among other things to choose these operating conditions taking into account other constraints related in particular to the characteristics of the insulating materials used. In the above examples, the temperature of the enclosure was set at the high value imposed by the cooking of the fluorinated varnish.
Claims (5)
caractérisé en ce que l'on effectue les opération de toronnage des fils fins formant le conducteur, on bien de guipage ou de tressage des fils entourant le ou les conducteurs isolés et formant l'écran électrique, en utilisant des fils fins non recuits ou seulement partiellement recuits, puis en ce que l'on soumet le conducteur toronné ou l'écran électrique guipé ou tressé à au moins un recuit final.1 / Method for manufacturing a flexible electric cable consisting of a stranded conductor formed of fine wires, of diameter less than 0.5 mm, made of aluminum or aluminum alloy, coated with a polymer material, or made up of one or more insulated conductors, coated with an electrical screen formed of fine wires of diameter less than 0.5 mm, made of aluminum or aluminum alloy, wrapped or braided around them, this screen can be surrounded by at least an insulating layer of polymer material,
characterized in that one carries out the operations of stranding the fine wires forming the conductor, or wrapping or braiding the wires surrounding the insulated conductor (s) and forming the electrical screen, using fine wires not annealed or only partially annealed, then in that the stranded conductor or the wrapped or braided electrical screen is subjected to at least one final annealing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8704691A FR2613528B1 (en) | 1987-04-03 | 1987-04-03 | METHOD FOR MANUFACTURING A FLEXIBLE ELECTRICAL CONDUCTOR CABLE COMPRISING THIN THREADS OF ALUMINUM OR ALUMINUM ALLOY |
| FR8704691 | 1987-04-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0297219A1 true EP0297219A1 (en) | 1989-01-04 |
| EP0297219B1 EP0297219B1 (en) | 1993-03-10 |
Family
ID=9349751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88105170A Expired - Lifetime EP0297219B1 (en) | 1987-04-03 | 1988-03-30 | Manufacturing method of a flexible electrical cable |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4859258A (en) |
| EP (1) | EP0297219B1 (en) |
| JP (1) | JPS63264818A (en) |
| CA (1) | CA1318113C (en) |
| DE (1) | DE3879003T2 (en) |
| ES (1) | ES2039492T3 (en) |
| FR (1) | FR2613528B1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2674365B1 (en) * | 1991-03-21 | 1993-06-04 | Filotex Sa | COAXIAL CABLE WITH LOW LOSSES. |
| JP5486870B2 (en) * | 2009-08-18 | 2014-05-07 | 矢崎総業株式会社 | Manufacturing method of aluminum alloy wire |
| RU2551136C1 (en) * | 2013-12-25 | 2015-05-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тольяттинский государственный университет" (ТГУ) | Electric coil production method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE884833C (en) * | 1947-03-05 | 1953-07-30 | Asea Ab | Process for the continuous production of shaped electrical cable conductors with a good fill factor and while maintaining a good electrical conductivity |
| FR1281150A (en) * | 1961-02-23 | 1962-01-08 | Ericsson Telefon Ab L M | Manufacturing process of plastic insulated twisted copper wire |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2083323B1 (en) * | 1970-03-16 | 1976-06-11 | British Insulated Callenders | |
| JPS59207509A (en) * | 1983-05-11 | 1984-11-24 | 住友電気工業株式会社 | Method of producing flat type insulated wire |
-
1987
- 1987-04-03 FR FR8704691A patent/FR2613528B1/en not_active Expired
-
1988
- 1988-03-30 ES ES198888105170T patent/ES2039492T3/en not_active Expired - Lifetime
- 1988-03-30 DE DE8888105170T patent/DE3879003T2/en not_active Expired - Fee Related
- 1988-03-30 EP EP88105170A patent/EP0297219B1/en not_active Expired - Lifetime
- 1988-03-31 CA CA000563117A patent/CA1318113C/en not_active Expired - Fee Related
- 1988-04-01 JP JP63081136A patent/JPS63264818A/en active Pending
- 1988-04-04 US US07/177,264 patent/US4859258A/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE884833C (en) * | 1947-03-05 | 1953-07-30 | Asea Ab | Process for the continuous production of shaped electrical cable conductors with a good fill factor and while maintaining a good electrical conductivity |
| FR1281150A (en) * | 1961-02-23 | 1962-01-08 | Ericsson Telefon Ab L M | Manufacturing process of plastic insulated twisted copper wire |
Also Published As
| Publication number | Publication date |
|---|---|
| CA1318113C (en) | 1993-05-25 |
| EP0297219B1 (en) | 1993-03-10 |
| FR2613528B1 (en) | 1989-06-09 |
| US4859258A (en) | 1989-08-22 |
| FR2613528A1 (en) | 1988-10-07 |
| ES2039492T3 (en) | 1993-10-01 |
| DE3879003T2 (en) | 1993-06-24 |
| JPS63264818A (en) | 1988-11-01 |
| DE3879003D1 (en) | 1993-04-15 |
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