EP0467798A1 - Process for making a welded connection between a flexible conductor and a contact finger, and contact finger - Google Patents

Process for making a welded connection between a flexible conductor and a contact finger, and contact finger Download PDF

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Publication number
EP0467798A1
EP0467798A1 EP91420235A EP91420235A EP0467798A1 EP 0467798 A1 EP0467798 A1 EP 0467798A1 EP 91420235 A EP91420235 A EP 91420235A EP 91420235 A EP91420235 A EP 91420235A EP 0467798 A1 EP0467798 A1 EP 0467798A1
Authority
EP
European Patent Office
Prior art keywords
strip
braid
contact finger
welding
notch
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
EP91420235A
Other languages
German (de)
French (fr)
Other versions
EP0467798B1 (en
Inventor
Jean-Paul Favre-Tissot
Georges Fevrier
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.)
Merlin Gerin SA
Original Assignee
Merlin Gerin SA
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Filing date
Publication date
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Publication of EP0467798A1 publication Critical patent/EP0467798A1/en
Application granted granted Critical
Publication of EP0467798B1 publication Critical patent/EP0467798B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H1/5822—Flexible connections between movable contact and terminal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49174—Assembling terminal to elongated conductor
    • Y10T29/49179—Assembling terminal to elongated conductor by metal fusion bonding
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49174—Assembling terminal to elongated conductor
    • Y10T29/49181—Assembling terminal to elongated conductor by deforming
    • Y10T29/49185—Assembling terminal to elongated conductor by deforming of terminal

Definitions

  • the invention relates to a method of connecting by welding a flexible conductor, in particular a copper braid, to the rear end of a contact finger made of a material of good electrical conductivity, in particular copper, from of a stacking side by side of two elementary strips of identical external profiles, and joined together at the front part by a common contact pad.
  • each contact finger comprises a pair of identical strips and joined side by side.
  • the rear end of each strip is provided with a notch to allow the braid to be fixed.
  • This assembly is carried out by a first mechanical hot insertion operation of the end of the braid in the two notches completely crossing the width of the finger, followed by a second brazing operation by adding tin.
  • a third surfacing operation is then necessary to remove the unwanted particles due to soldering.
  • This latter operation is carried out manually by means of a cleaning brush, the passage of which must be effected directly after brazing when the two opposite surfaces of the connection are still hot.
  • the opposite end of the braid is introduced into the notches of a current supply range and then welded by resistance after local deformation of the teeth delimiting the notches.
  • a first object of the invention is to perfect the method of assembling a braid to a contact finger.
  • the assembly by resistance welding is carried out in a single operation without the addition of solder.
  • the additional surfacing operation is eliminated, since the use of electrodes with flat bearing faces prevents local deformation of the lamellae and any excess of material in the welded connection zone.
  • the excess copper due to the excess thickness of the compacted end of the braid is automatically compensated for in the connection during the hot inlaying operation.
  • the reduction of surplus is obtained either by maximum crushing of the turns of the compacted end of the braid, or by transfer of the molten copper in a discharge port made in the second strip.
  • a second object of the invention relates to the production of a contact finger with several lamellae and a connection braid for a high current circuit breaker.
  • the braid is welded in a half-housing delimited by a semi-open notch in the first strip and the planar side juxtaposed with the second strip.
  • the presence in the second strip of a discharge light at the right of the notch of the first coverslip absorbs excess copper during hot inlaying of the compacted end of the braid in the receiving housing.
  • the surface of the light is less than that of the notch. This results in an additional anchoring which strengthens the strength of the welded connection.
  • a movable contact finger 10 of a low-voltage current cut-off device is formed by a stacking side by side. side of two elementary strips 12,14, having identical external profiles.
  • Each strip 12,14 is cut from a copper strip, having a thickness close to two millimeters.
  • a circular orifice 16 is formed in each strip 12,14 to allow the mounting of the finger 10 on a transverse pivot axis.
  • the assembly of the first and second elementary strips 12, 14 is operated by fixing a contact pad 18 to the front part, and by connecting the end 21 of a flexible braid 20 to the rear part of the finger 10.
  • the another end 22 of the braid 20 is intended to be connected to a current supply range (not shown).
  • the flexible braid 20 is made of copper, and the end 21 is shaped by a compacting and shearing operation to obtain a rigid rectangular tinned end. This compacting operation of the braid 20 is carried out by a special machine.
  • the rear part of the first strip 12 is equipped with a semi-open notch 24 cooperating with the juxtaposed flat part of the second strip 14 to define a housing 25 for receiving the end 21 to be connected.
  • the notch 24 and the end 21 have conjugate rectangular shapes, and the depth of the housing 25 corresponds substantially to the thickness of the strip 12 (see FIGS. 6 and 11).
  • the thickness h of the compacted end 21 of the braid 20 is slightly greater than the depth of the housing 25, that is to say the thickness of the strip 12.
  • Figures 1 to 6 and 7 to 11 show two embodiments of contact finger 10 for two different sizes of circuit breakers.
  • the braid 20 has a reduced section, and the entire rear part of the second strip 14 beyond the orifice 16; is massive.
  • the double section of the braid 20 requires a larger notch 24 in the first lamella 12.
  • an oblong outlet port 26 (FIGS. 8 and 9) is formed between the rear end of the second strip 14 and the orifice 16, to improve the connection between the braid 20 and the finger 10 during the welding operation.
  • the shape of this light 26 can be different, or have a plurality of holes.
  • the lumen 26 of the second lamella 14 is arranged in the vicinity of a plane passing through the bottom of the notch 24 of the first lamella 12. The length of the lumen 26 corresponds substantially to the width of the notch 24.
  • FIGS. 12 and 13 which illustrate the initial phase of the process of welding the braid 20 to the contact finger 10
  • the compacted end 21 of the braid 20 is positioned between the movable electrode 30 d '' a resistance welding press 31, and the notch 24 of the first strip 12 of the finger 10.
  • the second strip 14 of the latter bears flat on the fixed electrode 32, such that the axis of the orifices 16 s 'extends vertically in the direction of movement of the movable electrode 30.
  • the complementary shapes of the tip 21 and the notch 24 allow cold or hot embedding respectively before and during the welding operation.
  • the tip 21 extends parallel to the strip 12 and is projecting above the notch 24.
  • the downward movement according to arrow F1 of the movable electrode 30 first causes a gradual approximation of two jaws 34, 36 for clamping the welding press on the edges of the contact finger 10, then the hot inlaying of the tip 21 in the housing 25 by mechanical compression effect and electric heating by passing a welding current.
  • the locking of the contact finger 10 by the action of the clamping jaws 34.36 on the opposite edges of the lamellae 12.14 (arrow F2, Figure 13) is carried out at the rear part of the finger 10 to avoid local deformation strips 12,14 during the welding operation.
  • the blocking force F2 of the jaws 34, 36 is exerted transversely in a direction perpendicular to the movement of the mobile electrode 30.
  • Resistance welding of the copper braid 20 on the copper contact finger 10 takes place without addition of brazing metal (tin), and without annealing.
  • the planar configuration of the two electrodes 30, 32 contributes to obtaining, after welding, smooth lateral surfaces at the level of the connection zone, requiring no additional surfacing or cleaning of the contact finger 10.
  • the clamping jaws 34, 36 of the welding press are advantageously made of molybdenum, and are arranged to derive a fraction of current flowing in the electrodes 30, 32.
  • This method of welding a copper braid on a copper contact, without the addition of solder metal, is advantageously used for multiple pole contacts above 1000A.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)

Abstract

Method for making a welded connection between a braid (20) and a contact finger (10) comprising two elementary thin plates (12, 14) stacked face to face. The first thin plate (12) is provided with a half-open recess (24) interacting with the juxtaposed plane face of the second thin plate (14) in order to define a housing (25) for accommodating one compacted end (21) of the braid (20), the said end undergoing hot incrustation in the housing (25) by means of pressure welding, without local deformation of the thin plates (12, 14). The second thin plate (14) comprises a backflow opening (26) disposed at right angles to the recess (24) for allowing transfer of molten copper during the welding operation, the surface of the opening (26) being less than that of the recess (24). The connection is carried out in a single operation without braze feed. <IMAGE>

Description

L'invention est relative à un procédé de connexion par soudage d'un conducteur flexible, notamment une tresse en cuivre, à l'extrémité postérieure d'un doigt de contact réalisé en un matériau de bonne conductibilité électrique, notamment en cuivre, à partir d'un empilage côte à côte de deux lamelles élémentaires de profils extérieurs identiques, et réunies entre elles à la partie antérieure par une pastille de contact commune.The invention relates to a method of connecting by welding a flexible conductor, in particular a copper braid, to the rear end of a contact finger made of a material of good electrical conductivity, in particular copper, from of a stacking side by side of two elementary strips of identical external profiles, and joined together at the front part by a common contact pad.

Le document FR-A-2.556.515 décrit un dispositif de contacts électriques multiple pour disjoncteurs à fortes intensités, dans lequel chaque doigt de contact comporte une paire de lamelles identiques et accolées côte à côte. L'extrémité postérieure de chaque lamelle est pourvue d'une entaille pour autoriser la fixation de la tresse. Cet assemblage s'effectue par une première opération d'insertion mécanique à chaud du bout de la tresse dans les deux entailles traversant totalement la largeur du doigt, suivie d'une deuxième opération de brasage par apport d'étain. Une troisième opération de surfaçage est ensuite nécessaire pour enlever les particules indésirables dues au brasage. Cette dernière opération est effectuée manuellement au moyen d'un pinceau de nettoyage, dont le passage doit être opéré directement après le brasage lorsque les deux surfaces opposées de la liaison sont encore chaudes. L'extrémité opposée de la tresse est introduite dans des encoches d'une plage d'amenée de courant puis soudée par résistance après déformation locale des dents délimitant les encoches.The document FR-A-2,556,515 describes a multiple electrical contact device for high intensity circuit breakers, in which each contact finger comprises a pair of identical strips and joined side by side. The rear end of each strip is provided with a notch to allow the braid to be fixed. This assembly is carried out by a first mechanical hot insertion operation of the end of the braid in the two notches completely crossing the width of the finger, followed by a second brazing operation by adding tin. A third surfacing operation is then necessary to remove the unwanted particles due to soldering. This latter operation is carried out manually by means of a cleaning brush, the passage of which must be effected directly after brazing when the two opposite surfaces of the connection are still hot. The opposite end of the braid is introduced into the notches of a current supply range and then welded by resistance after local deformation of the teeth delimiting the notches.

Un premier objet de l'invention consiste à perfectionner le procédé d'assemblage d'une tresse à un doigt de contact.A first object of the invention is to perfect the method of assembling a braid to a contact finger.

Le procédé selon l'invention est caractérisé en ce que :

  • l'extrémité de la tresse est compactée pour obtenir un bout rigide de forme complémentaire à celle d'une encoche semi-ouverte pratiquée dans la première lamelle, le bout ayant une épaisseur légèrement supérieure à l'épaisseur de la première lamelle;
  • le doigt de contact est positionné à plat du côté de la deuxième lamelle sur l'électrode fixe d'une presse de soudage, l'encoche de la première lamelle délimitant un logement de réception avec la face plane juxtaposée de la deuxième lamelle;
  • le bout est ensuite chauffé par résistance et incrusté par compression à chaud dans le logement au moyen de l'électrode mobile après blocage préalable des chants opposés du doigt de contact au niveau de la zone de liaison, l'effet de blocage mécanique s'exerçant perpendiculairement au sens de compression et de passage du courant de soudage.
The method according to the invention is characterized in that:
  • the end of the braid is compacted to obtain a piece rigid with a shape complementary to that of a semi-open notch made in the first strip, the tip having a thickness slightly greater than the thickness of the first strip;
  • the contact finger is positioned flat on the side of the second strip on the fixed electrode of a welding press, the notch of the first strip delimiting a receiving housing with the flat face juxtaposed with the second strip;
  • the end is then heated by resistance and embedded by hot compression in the housing by means of the mobile electrode after prior blocking of the opposite edges of the contact finger at the level of the connection zone, the mechanical blocking effect being exerted perpendicular to the direction of compression and flow of the welding current.

L'assemblage par soudage à résistance est effectué en une seule opération sans apport de brasure. L'opération additionnelle de surfaçage est supprimée,étant donné que l'emploi d'électrodes à faces d'appui planes évite la déformation locale des lamelles et tout dépassement de matière dans la zone de liaison soudée.The assembly by resistance welding is carried out in a single operation without the addition of solder. The additional surfacing operation is eliminated, since the use of electrodes with flat bearing faces prevents local deformation of the lamellae and any excess of material in the welded connection zone.

Le surplus de cuivre dû à la surépaisseur du bout compacté de la tresse est compensé automatiquement dans la liaison lors de l'opération d'incrustation à chaud. La réduction de surplus est obtenue soit par écrasement maximum des spires du bout compacté de la tresse, soit par report du cuivre fondu dans une lumière de refoulement pratiquée dans la deuxième lamelle.The excess copper due to the excess thickness of the compacted end of the braid is automatically compensated for in the connection during the hot inlaying operation. The reduction of surplus is obtained either by maximum crushing of the turns of the compacted end of the braid, or by transfer of the molten copper in a discharge port made in the second strip.

Un deuxième objet de l'invention concerne la réalisation d'un doigt de contact à plusieurs lamelles et à tresse de liaison pour un disjoncteur à fortes intensités. Le soudage de la tresse est opéré dans un demi-logement délimité par une encoche semi-ouverte de la première lamelle et la face plane juxtaposée de la deuxième lamelle. La présence dans la deuxième lamelle d'une lumière de refoulement au droit de l'encoche de la première lamelle permet d'absorber l'excès de cuivre lors de l'incrustation à chaud du bout compacté de la tresse dans le logement de réception. La surface de la lumière est inférieure à celle de l'encoche. Il en résulte un ancrage supplémentaire qui renforce la résistance de la liaison soudée.A second object of the invention relates to the production of a contact finger with several lamellae and a connection braid for a high current circuit breaker. The braid is welded in a half-housing delimited by a semi-open notch in the first strip and the planar side juxtaposed with the second strip. The presence in the second strip of a discharge light at the right of the notch of the first coverslip absorbs excess copper during hot inlaying of the compacted end of the braid in the receiving housing. The surface of the light is less than that of the notch. This results in an additional anchoring which strengthens the strength of the welded connection.

D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre, de deux modes de réalisation de l'invention, donnés à titre d'exemples non limitatifs, et représentés aux dessins annexés dans lesquels:

  • la figure 1 est une vue schématique en élévation d'un doigt de contact à double lamelle connecté à une tresse de liaison;
  • la figure 2 montre une vue en plan de la figure 1;
  • la figure 3 représente une vue partielle de la partie postérieure du doigt de contact de la figure 1, avant le soudage de la tresse;
  • les figures 4 et 5 montrent respectivement la deuxième et la première lamelles du doigt de contact de la figure 3;
  • la figure 6 est une vue de profil de droite de la figure 3;
  • les figures 7 à 11 sont des vues identiques respectives des figures 1 à 6 d'une variante de réalisation;
  • la figure 12 illustre schématiquement la presse à souder avant l'opération de soudage de la tresse sur le doigt de contact;
  • la figure 13 est une vue schématique en plan de la presse de la figure 12, au début de la phase de soudage.
Other advantages and characteristics will emerge more clearly from the description which follows, of two embodiments of the invention, given by way of nonlimiting examples, and represented in the appended drawings in which:
  • Figure 1 is a schematic elevational view of a double lamella contact finger connected to a connecting braid;
  • Figure 2 shows a plan view of Figure 1;
  • 3 shows a partial view of the rear part of the contact finger of Figure 1, before welding of the braid;
  • Figures 4 and 5 show respectively the second and the first lamellae of the contact finger of Figure 3;
  • Figure 6 is a right side view of Figure 3;
  • Figures 7 to 11 are respective identical views of Figures 1 to 6 of an alternative embodiment;
  • Figure 12 schematically illustrates the welding press before the welding operation of the braid on the contact finger;
  • Figure 13 is a schematic plan view of the press of Figure 12, at the start of the welding phase.

Sur les figures, un doigt de contact 10 mobile d'un appareil de coupure de courant à basse tension, notamment un disjoncteur électrique de fortes intensités, est formé par un empilage côte à côte de deux lamelles 12,14 élémentaires, ayant des profils extérieurs identiques. Chaque lamelle 12,14 est découpée dans une bande de cuivre, présentant une épaisseur voisine de deux millimètres. Un orifice 16 circulaire est ménagé dans chaque lamelle 12,14 pour autoriser le montage du doigt 10 sur un axe transversal de pivotement. L'assemblage des première et deuxième lamelles 12,14 élémentaires est opéré par fixation d'une pastille de contact 18 à la partie antérieure, et par connexion du bout 21 d'une tresse 20 souple à la partie postérieure du doigt 10. L'autre extrémité 22 de la tresse 20 est destinée à être raccordée à une plage d'amenée de courant (non représentée).In the figures, a movable contact finger 10 of a low-voltage current cut-off device, in particular an electrical circuit breaker of high currents, is formed by a stacking side by side. side of two elementary strips 12,14, having identical external profiles. Each strip 12,14 is cut from a copper strip, having a thickness close to two millimeters. A circular orifice 16 is formed in each strip 12,14 to allow the mounting of the finger 10 on a transverse pivot axis. The assembly of the first and second elementary strips 12, 14 is operated by fixing a contact pad 18 to the front part, and by connecting the end 21 of a flexible braid 20 to the rear part of the finger 10. The another end 22 of the braid 20 is intended to be connected to a current supply range (not shown).

La fixation de la pastille de contact 18 à base d'argent sur les chants inférieures des lamelles 12,14 s'effectue au moyen d'une opération de brasage ou soudage par résistance, décrite en détail dans le brevet français 2.541.520.The fixing of the silver-based contact pad 18 on the lower edges of the strips 12, 14 is carried out by means of a brazing or resistance welding operation, described in detail in French patent 2,541,520.

La tresse 20 souple est réalisée en cuivre, et le bout 21 est mis en forme par une opération de compactage et de cisaillage pour obtenir un embout rectangulaire rigide non étamé. Cette opération de compactage de la tresse 20 est réalisée par une machine spéciale.The flexible braid 20 is made of copper, and the end 21 is shaped by a compacting and shearing operation to obtain a rigid rectangular tinned end. This compacting operation of the braid 20 is carried out by a special machine.

La partie postérieure de la première lamelle 12 est équipée d'une encoche 24 semi-ouverte coopérant avec la partie plane juxtaposée de la deuxième lamelle 14 pour définir un logement 25 de réception du bout 21 à raccorder.The rear part of the first strip 12 is equipped with a semi-open notch 24 cooperating with the juxtaposed flat part of the second strip 14 to define a housing 25 for receiving the end 21 to be connected.

L'encoche 24 et le bout 21 présentent des formes rectangulaires conjuguées, et la profondeur du logement 25 correspond sensiblement à l'épaisseur de la lamelle 12 (voir figure 6 et 11). Par contre l'épaisseur h du bout 21 compacté de la tresse 20 (voir figure 12) est légèrement supérieure à la profondeur du logement 25, c'est à dire à l'épaisseur de la lamelle 12.The notch 24 and the end 21 have conjugate rectangular shapes, and the depth of the housing 25 corresponds substantially to the thickness of the strip 12 (see FIGS. 6 and 11). On the other hand, the thickness h of the compacted end 21 of the braid 20 (see FIG. 12) is slightly greater than the depth of the housing 25, that is to say the thickness of the strip 12.

Les figures 1 à 6 et 7 à 11 montrent deux modes de réalisation de doigt de contact 10 pour deux calibres différents de disjoncteurs.Figures 1 to 6 and 7 to 11 show two embodiments of contact finger 10 for two different sizes of circuit breakers.

Pour le calibre inférieur des figures 1 à 6, la tresse 20 possède une section réduite, et toute la partie postérieure de la deuxième lamelle 14 au-delà de l'orifice 16; est massive.For the lower gauge of Figures 1 to 6, the braid 20 has a reduced section, and the entire rear part of the second strip 14 beyond the orifice 16; is massive.

Pour la calibre supérieur des figures 7 à 11, la section double de la tresse 20 nécessite une encoche 24 plus grande dans la première lamelle 12. Dans ce cas, une lumière 26 oblongue de refoulement (figures 8 et 9) est ménagée entre l'extrémité postérieure de la deuxième lamelle 14 et l'orifice 16, pour améliorer la liaison entre le tresse 20 et le doigt 10 lors de l'opération de soudage. La forme de cette lumière 26 peut être différente, ou comporter une pluralité de trous. En position accolée des deux lamelles 12,14 (figure 8), la lumière 26 de la deuxième lamelle 14 est disposée au voisinage d'un plan passant par le fond de l'encoche 24 de la première lamelle 12. La longueur de la lumière 26 correspond sensiblement à la largeur de l'encoche 24.For the higher gauge of FIGS. 7 to 11, the double section of the braid 20 requires a larger notch 24 in the first lamella 12. In this case, an oblong outlet port 26 (FIGS. 8 and 9) is formed between the rear end of the second strip 14 and the orifice 16, to improve the connection between the braid 20 and the finger 10 during the welding operation. The shape of this light 26 can be different, or have a plurality of holes. In the adjoining position of the two strips 12,14 (FIG. 8), the lumen 26 of the second lamella 14 is arranged in the vicinity of a plane passing through the bottom of the notch 24 of the first lamella 12. The length of the lumen 26 corresponds substantially to the width of the notch 24.

En se référant plus particulièrement aux figures 12 et 13, qui illustrent la phase initiale du procédé de soudage de la tresse 20 au doigt de contact 10, on remarque que le bout 21 compacté de la tresse 20 est positionné entre l'électrode mobile 30 d'une presse de soudage 31 par résistance, et l'encoche 24 de la première lamelle 12 du doigt 10. La deuxième lamelle 14 de ce dernier prend appui à plat sur l'éléctrode fixe 32, tel que l'axe des orifices 16 s'étend verticalement selon la direction de déplacement de l'électrode mobile 30. Les formes complémentaires du bout 21 et de l'encoche 24 autorisent l'encastrement à froid ou à chaud respectivement avant et pendant l'opération de soudage.Referring more particularly to FIGS. 12 and 13, which illustrate the initial phase of the process of welding the braid 20 to the contact finger 10, it is noted that the compacted end 21 of the braid 20 is positioned between the movable electrode 30 d '' a resistance welding press 31, and the notch 24 of the first strip 12 of the finger 10. The second strip 14 of the latter bears flat on the fixed electrode 32, such that the axis of the orifices 16 s 'extends vertically in the direction of movement of the movable electrode 30. The complementary shapes of the tip 21 and the notch 24 allow cold or hot embedding respectively before and during the welding operation.

Dans l'exemple de la figure 12, le bout 21 s'étend parallèlement à la lamelle 12 et se trouve en saillie au-dessus de l'encoche 24. Le mouvement de descente selon la flèche F1 de l'électrode mobile 30 provoque, d'abord un rapprochement progressif de deux mors 34,36 de serrage de la presse de soudage sur les chants du doigt de contact 10, puis l'incrustation à chaud du bout 21 dans le logement 25 par effet de compression mécanique et de chauffage électrique par passage d'un courant de soudage. Le blocage du doigt de contact 10 par l'action des mors 34,36 de serrage sur les chants opposés des lamelles 12,14 (flèche F2, Figure 13), s'effectue à la partie postérieure du doigt 10 pour éviter la déformation locale des lamelles 12,14 pendant l'opération de soudage. La force de blocage F2 des mors 34,36 s'exerce transversalement selon une direction perpendiculaire au déplacement de l'électrode mobile 30. Le soudage par résistance de la tresse 20 en cuivre sur le doigt de contact 10 en cuivre s'opère sans apport de métal de brasure(étain), et sans recuit. La configuration plane des deux électrodes 30,32 contribue à obtenir après soudage des surfaces latérales lisses au niveau de la zone de liaison, ne nécessitant aucune opération additionnelle de surfaçage ou de nettoyage du doigt de contact 10.In the example of Figure 12, the tip 21 extends parallel to the strip 12 and is projecting above the notch 24. The downward movement according to arrow F1 of the movable electrode 30 first causes a gradual approximation of two jaws 34, 36 for clamping the welding press on the edges of the contact finger 10, then the hot inlaying of the tip 21 in the housing 25 by mechanical compression effect and electric heating by passing a welding current. The locking of the contact finger 10 by the action of the clamping jaws 34.36 on the opposite edges of the lamellae 12.14 (arrow F2, Figure 13) is carried out at the rear part of the finger 10 to avoid local deformation strips 12,14 during the welding operation. The blocking force F2 of the jaws 34, 36 is exerted transversely in a direction perpendicular to the movement of the mobile electrode 30. Resistance welding of the copper braid 20 on the copper contact finger 10 takes place without addition of brazing metal (tin), and without annealing. The planar configuration of the two electrodes 30, 32 contributes to obtaining, after welding, smooth lateral surfaces at the level of the connection zone, requiring no additional surfacing or cleaning of the contact finger 10.

Le surplus de cuivre dû à la surépaisseur du bout 21 compacté de la tresse 20 est réduit automatiquement lors de l'incrustation à chaud réalisée par la presse de soudage:

  • soit par écrasement maximum des spires du bout 21 de tresse compacté (cas figures 1 à 6);
  • soit par report de cuivre fondu dans la lumière 26 de la deuxième lamelle 14 juxtaposée (cas figures 7 à 11) permettant d'obtenir un effet d'agrippage supplémentaire qui améliore la résistance à la traction de la liaison soudée.
The excess copper due to the excess thickness of the compacted end 21 of the braid 20 is automatically reduced during hot inlaying carried out by the welding press:
  • either by maximum crushing of the turns of the end 21 of compacted braid (case Figures 1 to 6);
  • or by transferring molten copper into the lumen 26 of the second juxtaposed strip 14 (case in FIGS. 7 to 11) allowing an additional gripping effect to be obtained which improves the tensile strength of the welded connection.

Les mors de serrage 34,36 de la presse de soudage sont avantageusement réalisés en molybdène, et sont agencés pour dériver une fraction de courant circulant dans les électrodes 30,32.The clamping jaws 34, 36 of the welding press are advantageously made of molybdenum, and are arranged to derive a fraction of current flowing in the electrodes 30, 32.

Ce procédé de soudage d'une tresse en cuivre sur un contact en cuivre, sans apport de métal de brasure, est avantageusement utilisé pour des contacts multiples de pôles au-dessus de 1000A.This method of welding a copper braid on a copper contact, without the addition of solder metal, is advantageously used for multiple pole contacts above 1000A.

Claims (7)

Procédé de connexion par soudage d'un conducteur flexible, notamment une tresse (20) en cuivre, à l'extrémité postérieure d'un doigt de contact (10) réalisé en un matériau de bonne conductibilité électrique, notamment en cuivre, à partir d'un empilage côte à côte de deux lamelles (12,14) élémentaires de profils extérieurs identiques, et réunies entre elles à la partie antérieure par une pastille de contact (18) commune, caractérisé en ce que : - l'extrémité de la tresse (20) est compactée pour obtenir un bout (21) rigide de forme complémentaire à celle d'une encoche (24) semi-ouverte pratiquée dans la première lamelle (12), le bout (21) ayant une épaisseur (h) légèrement supérieure à l'épaisseur de la première lamelle (12); - le doigt de contact (10) est positionné à plat du côté de la deuxième lamelle (14) sur l'électrode fixe (32) d'une presse de soudage (31), l'encoche (24) de la première lamelle (12) délimitant un logement (25) de réception avec la face plane juxtaposée de la deuxième lamelle (14); - le bout (21) est ensuite chauffé par résistance et incrusté par compression à chaud dans le logement (25) au moyen de l'électrode mobile (30) après blocage préalable des chants opposés du doigt de contact (10) au niveau de la zone de liaison, l'effet de blocage mécanique s'exerçant perpendiculairement au sens de compression et de passage du courant de soudage. Method for connecting by welding a flexible conductor, in particular a copper braid (20), to the rear end of a contact finger (10) made of a material with good electrical conductivity, in particular copper, from 'a stacking side by side of two elementary strips (12,14) of identical external profiles, and joined together at the front part by a common contact pad (18), characterized in that: - The end of the braid (20) is compacted to obtain a rigid end (21) of shape complementary to that of a semi-open notch (24) made in the first strip (12), the end (21) having a thickness (h) slightly greater than the thickness of the first strip (12); - the contact finger (10) is positioned flat on the side of the second strip (14) on the fixed electrode (32) of a welding press (31), the notch (24) of the first strip ( 12) delimiting a housing (25) for receiving with the juxtaposed flat face of the second strip (14); - The end (21) is then heated by resistance and embedded by hot compression in the housing (25) by means of the mobile electrode (30) after prior blocking of the opposite edges of the contact finger (10) at the connection zone, the mechanical blocking effect being exerted perpendicular to the direction of compression and flow of the welding current. Procédé de connexion selon la revendication 1, caractérisé en ce qu'on utilise des électrodes (30,32) à faces d'appui planes pour obtenir des surfaces latérales complémentaires au niveau de la zone de liaison sans dépassement de matière après l'opération de soudage réalisée sans apport de brasure, et que le surplus de cuivre dû à la surépaisseur du bout (21) compacté de la tresse (20) est compensé automatiquement dans la liaison lors de l'opération d'incrustation à chaud.Connection method according to claim 1, characterized in that electrodes (30,32) with planar support faces are used to obtain complementary lateral surfaces at the level of the connection zone without material overshoot after the operation of welding performed without the addition of solder, and that the excess copper due to the excess thickness of the compacted end (21) of the braid (20) is automatically compensated for in the connection during the hot inlay operation. Procédé de connexion selon la revendication 2, caractérisé en ce que le surplus de cuivre est réduit par écrasement maximum de spires du bout (21) compacté.Connection method according to claim 2, characterized in that the excess copper is reduced by maximum crushing of turns of the compacted end (21). Procédé de connexion selon la revendication 2, caractérisé en ce que le surplus de cuivre est compensé par report dans une lumière (26) de la deuxième lamelle (14) juxtaposée, engendrant un effet d'agrippage supplémentaire pour améliorer la résistance à la traction de la liaison soudée.Connection method according to claim 2, characterized in that the excess copper is compensated for by transfer in a lumen (26) of the second lamella (14) juxtaposed, generating an additional gripping effect to improve the tensile strength of the welded connection. Doigt de contact électrique, notamment pour un disjoncteur à fortes intensités, comprenant un empilage côte à côte de deux lamelles (12,14) élémentaires de profils extérieurs identiques et réalisées en matériau bon conducteur de l'électricité, assemblées à la partie antérieure par une pastille de contact 18, et à l'extrémité postérieure par une tresse (20) de liaison, caractérisé en ce que la première lamelle (12) est dotée d'une encoche (24) semi-ouverte coopérant avec la face plane juxtaposée de la deuxième lamelle (14) pour définir un logement (25) de réception d'un bout (21) compacté de la tresse (20), ledit bout étant incrusté à chaud dans le logement (25) par soudage sous-pression, sans déformation locale des lamelles (12,14).Electrical contact finger, in particular for a high-intensity circuit breaker, comprising a stacking side by side of two elementary strips (12, 14) of identical external profiles and made of material which is good conductor of electricity, assembled at the front by a contact pad 18, and at the rear end by a braid (20) for connection, characterized in that the first strip (12) is provided with a semi-open notch (24) cooperating with the flat face juxtaposed with the second strip (14) to define a housing (25) for receiving a compacted end (21) of the braid (20), said end being hot-embedded in the housing (25) by pressure welding, without local deformation lamellae (12,14). Doigt de contact électrique selon la revendication 5, caractérisé en ce que la deuxième lamelle (14) comporte une lumière (26) de refoulement disposée au droit de l'encoche (24) pour autoriser le transfert de cuivre fondu lors de l'opération de soudage, la surface de la lumière (26) étant inférieure à celle de l'encoche (24).Electrical contact finger according to claim 5, characterized in that the second strip (14) comprises a discharge port (26) arranged in line with the notch (24) to authorize the transfer of molten copper during the operation of welding, the surface of the light (26) being less than that of the notch (24). Doigt de contact électrique selon la revendication 6, caractérisé en ce que la lumière (26) est située au voisinage du fond de l'encoche (24) pour former un ancrage supplémentaire de la liaison soudée.Electrical contact finger according to claim 6, characterized in that the light (26) is located in the vicinity of the bottom of the notch (24) to form an additional anchorage for the welded connection.
EP91420235A 1990-07-19 1991-07-09 Process for making a welded connection between a flexible conductor and a contact finger, and contact finger Expired - Lifetime EP0467798B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9009359A FR2665026B1 (en) 1990-07-19 1990-07-19 METHOD FOR WELDING CONNECTION OF A FLEXIBLE CONDUCTOR TO A CONTACT FINGER, AND ELECTRICAL CONTACT STRUCTURE WITH MULTIPLE BLADES.
FR9009359 1990-07-19

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EP0467798A1 true EP0467798A1 (en) 1992-01-22
EP0467798B1 EP0467798B1 (en) 1995-01-25

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EP (1) EP0467798B1 (en)
JP (1) JP3020664B2 (en)
KR (1) KR100188813B1 (en)
CA (1) CA2046781C (en)
DE (1) DE69106963T2 (en)
ES (1) ES2070469T3 (en)
FR (1) FR2665026B1 (en)
MX (1) MX9100170A (en)

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WO2000044013A1 (en) * 1999-01-20 2000-07-27 Siemens Aktiengesellschaft Method for connecting a contact body and a flexible conductor, and a compression mold for carrying out said method
EP1385183A1 (en) * 2002-07-25 2004-01-28 Siemens Aktiengesellschaft Switch contact arrangement comprising a contact lever and a flexible conductor
WO2012026616A1 (en) * 2010-08-25 2012-03-01 Yazaki Corporation Method for Shaping Electric Wire End and Mold for Shaping Electric Wire End
FR2987220A1 (en) * 2012-02-17 2013-08-23 Tresse Metallique J Forissier Thermal conduction device for use in e.g. aerospace applications, has thermally conductive metal braids whose free ends are electrically compacted in order to prevent solder from rising in braids by capillarity during welding

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DE19636237A1 (en) * 1996-06-21 1998-01-02 Siemens Ag Low-voltage circuit-breaker switching contact system
DE19627324A1 (en) * 1996-06-26 1998-01-02 Siemens Ag Method of connecting a rigid conductor piece with flexible conductors
US6474435B1 (en) 2000-09-07 2002-11-05 Trw Vehicle Safety Systems Inc. Means for electrical connection of components in a vehicle occupant protection system
ITMI20020789A1 (en) * 2002-04-12 2003-10-13 Abb Service Srl CONNECTION ELEMENT OF A FLEXIBLE CONDUCTOR AND METHOD FOR CONNECTING A FLEXIBLE CONDUCTOR TO A CONNECTION TERMINAL
DE10352325B4 (en) * 2003-11-06 2013-11-07 Bayerische Motoren Werke Aktiengesellschaft Method for producing an electrically conductive connection u. Contact part with an electrical connection produced in this way
DE102008039704A1 (en) * 2008-08-26 2010-03-04 Tyco Electronics Amp Gmbh Contact arrangement with bent strand, relay with contact arrangement and method for mounting a relay
FR2942069B1 (en) 2009-02-06 2012-02-10 Schneider Electric Ind Sas ELECTRICAL CONTACT, METHOD FOR WELDING A CONTACT PAD ON A METAL SUPPORT TO MAKE SUCH CONTACT.
US8816242B2 (en) * 2010-03-31 2014-08-26 Advanced Neuromodulation Systems, Inc. Method of fabricating implantable pulse generator using wire connections to feedthrough structures and implantable pulse generators
JPWO2014077144A1 (en) * 2012-11-16 2017-01-05 株式会社オートネットワーク技術研究所 Electric wire with terminal bracket
CN103358002B (en) * 2013-06-25 2015-09-09 欧托凯勃汽车线束（太仓）有限公司 For electric resistance welding equipment and the method for soldering flat braiding copper strips end
DE102014109173B4 (en) * 2014-07-01 2023-06-07 Te Connectivity Germany Gmbh Electrical contact device and electrical welded connection and method for producing a contact device and for setting up a welded connection
JP6597212B2 (en) * 2015-11-12 2019-10-30 住友電装株式会社 Conductive member
KR102047783B1 (en) 2019-07-11 2019-11-22 김종욱 Liquid crystal display, and display device including the same

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Cited By (9)

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Publication number Priority date Publication date Assignee Title
WO2000044013A1 (en) * 1999-01-20 2000-07-27 Siemens Aktiengesellschaft Method for connecting a contact body and a flexible conductor, and a compression mold for carrying out said method
US6751849B1 (en) 1999-01-20 2004-06-22 Siemens Aktiengesellschaft Method for connecting a contact body and a flexible conductor, and a compression mold for carrying out said method
EP1385183A1 (en) * 2002-07-25 2004-01-28 Siemens Aktiengesellschaft Switch contact arrangement comprising a contact lever and a flexible conductor
WO2012026616A1 (en) * 2010-08-25 2012-03-01 Yazaki Corporation Method for Shaping Electric Wire End and Mold for Shaping Electric Wire End
CN103081259A (en) * 2010-08-25 2013-05-01 矢崎总业株式会社 Method for shaping electric wire end and mold for shaping electric wire end
US8534111B2 (en) 2010-08-25 2013-09-17 Yazaki Corporation Method for shaping electric wire end and mold for shaping electric wire end
RU2527485C1 (en) * 2010-08-25 2014-09-10 Язаки Корпорейшн Method of shaping electric wire end and mould for shaping electric wire end
CN103081259B (en) * 2010-08-25 2016-02-03 矢崎总业株式会社 The method be shaped for making wire end and the mould for making wire end be shaped
FR2987220A1 (en) * 2012-02-17 2013-08-23 Tresse Metallique J Forissier Thermal conduction device for use in e.g. aerospace applications, has thermally conductive metal braids whose free ends are electrically compacted in order to prevent solder from rising in braids by capillarity during welding

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FR2665026A1 (en) 1992-01-24
DE69106963T2 (en) 1995-08-10
DE69106963D1 (en) 1995-03-09
KR920003360A (en) 1992-02-29
CA2046781A1 (en) 1992-01-20
ES2070469T3 (en) 1995-06-01
US5163221A (en) 1992-11-17
CA2046781C (en) 2001-07-03
MX9100170A (en) 1992-02-28
JP3020664B2 (en) 2000-03-15
JPH04248283A (en) 1992-09-03
FR2665026B1 (en) 1992-09-18
EP0467798B1 (en) 1995-01-25
KR100188813B1 (en) 1999-06-01

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