EP2048675A1 - Method of manufacturing contact pads for electrical switchgear and button obtained according to this method - Google Patents

Method of manufacturing contact pads for electrical switchgear and button obtained according to this method Download PDF

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Publication number
EP2048675A1
EP2048675A1 EP08354064A EP08354064A EP2048675A1 EP 2048675 A1 EP2048675 A1 EP 2048675A1 EP 08354064 A EP08354064 A EP 08354064A EP 08354064 A EP08354064 A EP 08354064A EP 2048675 A1 EP2048675 A1 EP 2048675A1
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EP
European Patent Office
Prior art keywords
contact
contact pad
elementary
piece
slot
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Granted
Application number
EP08354064A
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German (de)
French (fr)
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EP2048675B1 (en
Inventor
Denis Guillet
Olivier Cardoletti
Albin Henon
Cyril Nicolle
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Schneider Electric Industries SAS
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Schneider Electric Industries SAS
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Publication of EP2048675A1 publication Critical patent/EP2048675A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/0203—Contacts characterised by the material thereof specially adapted for vacuum switches
    • H01H1/0206—Contacts characterised by the material thereof specially adapted for vacuum switches containing as major components Cu and Cr
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
    • H01H33/6643—Contacts; Arc-extinguishing means, e.g. arcing rings having disc-shaped contacts subdivided in petal-like segments, e.g. by helical grooves

Definitions

  • the present invention relates to a method for manufacturing contact pads for an electrical breaking device, said contact pad comprising at least one slot, and a contact pad made according to the method mentioned above.
  • a preform is made consisting of a cylinder of diameter slightly greater than the final diameter of the contact and thickness, that of the contact after machining.
  • This preform is sintered, calibrated and then annealed in order to give the contact the desired physicochemical properties including the desired electrical conductivity.
  • This preform is then machined to give the contact its final shape.
  • the shape of the contact contributes to the breaking function of the vacuum bulbs, especially with the machining of the slots.
  • This fabrication ends in a deburring step, this step having for objective to remove any sharp angle possibly left by machining chips and affecting the dielectric strength of the contact in the vacuum bottle.
  • the first is a metallurgical step of sintering the preform and obtaining the final physicochemical properties
  • the second is a machining step.
  • This last step does not really have any added value in the manufacture of the contact. This machining cost is all the more important as some suppliers perform a manual deburring operation, a necessary operation in areas inaccessible to tools, such as the end of machined slots.
  • the present invention solves these disadvantages and proposes a method of manufacturing contact pads for an electrical breaking device, easy to implement and having a reduced cost, and a contact pad obtained by means of this method.
  • the subject of the present invention is a method for manufacturing contact pads for an electrical switching device, said contact pad comprising at least one least one slot, this method being characterized in that it comprises at least one step of identifying and producing an elementary piece of the contact pad, said piece having no slot and can be reproduced several times to form after a suitable assembly of said parts, a contact pad in its final form, and a step of assembling said elementary pieces so as to obtain said contact pad in its final form, the slots being made by two edges facing two adjacent elementary parts.
  • said method comprises a calibration and annealing step, said calibration and annealing steps being intended to confer the appropriate physicochemical properties on said material. electrical contact of the aforementioned elementary parts.
  • said method comprises a deburring step.
  • said method comprises a step of fixing said assembly on a contact support.
  • the steps of calibration and assembly of the elementary parts are performed simultaneously by means of a sintering part ensuring the mechanical strength of the contact.
  • the elementary parts are produced by sintering.
  • the subject of the invention is also an elementary piece of contact pad, said piece having no slot and being capable of being reproduced several times in order to form, after an appropriate assembly of these pieces, a contact pad in its final form.
  • said slot having slots, each of the slots being made by two facing edges respectively belonging to two adjacent elementary pieces.
  • this part is formed by a quarter ring connected on a part of its outer circumference to a beak-shaped portion, this part having a circular peripheral edge forming the circular peripheral edge of the contact pad and a rectilinear inner edge for forming with the outer side edge of an adjacent elementary piece, an orthoradial rectilinear slot of the contact pad and a lateral outer edge for forming with the straight inner edge of an adjacent elementary piece a second orthoradial slot .
  • Another subject of the present invention is a contact pad, this pad being characterized in that it consists of at least two elementary pieces having the previously mentioned characteristics taken alone or in combination.
  • the slots belonging to the contact patch are of radial or orthoradial form.
  • the present invention further relates to an electric switchgear and a vacuum interrupter comprising at least one contact pad, said pad having the aforementioned characteristics taken alone or in combination.
  • this vacuum interrupter comprises a cylindrical envelope inside which are housed two arcing contacts respectively a fixed arcing contact and a movable arcing contact, this movable contact being able to be moved. inside the casing between two positions respectively a closing position of the contacts and a position of opening of the contacts.
  • this contact pad 1 is in one piece and was made by shrinking, then machining the slots.
  • a contact pad 2 made according to the method of the invention is illustrated.
  • the first step of the method consists in identifying the shape of an elementary piece 3 having no slot, which part is intended to be reproduced in a certain number of copies, these elementary pieces 3 then being intended to be assembled in such a way as to forming a disk-shaped pellet 2 having slots 4.
  • the elementary part 3 is manufactured for example by sintering without additional machining.
  • the slots 4 of the contact pad 2 are formed by two facing edges 4a, 4b respectively belonging to two adjacent elementary pieces 3a, 3b.
  • the pellet 2 is constituted by four elementary pieces 3a, 3b, 3c, 3d such as that illustrated on FIG. figure 3 said pieces being assembled to form a whole pellet.
  • each of the elementary pieces 3 is formed by a ring quarter 5 connected on a part of its outer circumference 6 by a beak-shaped part 7, this part 7 having a circular peripheral edge 8 forming the circular peripheral edge of the contact pad 2, a rectilinear inner edge 9 and an outer lateral edge 10.
  • the rectilinear inner edge 9 of an elementary piece 3a forms with the outer rectilinear edge 10a of a adjacent part 3d an orthoradial slot 11.
  • the lateral outer edge 10 of the elementary part 3a forms with the rectilinear inner edge 9a of an adjacent elementary piece 3b an orthoradial rectilinear slot 11a of the contact pad 2.
  • said elementary part After manufacture of the elementary part for example by sintering, said elementary part is calibrated, then annealed, in order to give the material of said part the expected physicochemical properties of the contact material.
  • the piece thus manufactured can be deburred by industrial means (for example by passing the barrel).
  • the contact is then reconstituted by final assembly of the various elementary parts and fixing of this assembly by a solder 12 on a contact support 13.
  • this elementary part being smaller in size than the final pellet, the means of implementation, for example comprising a pelletizing press, are reduced and require less investment.
  • the steps for calibrating and assembling the elementary shapes can be performed simultaneously with the aid of a shrinking piece 14, ensuring the mechanical strength of the contact, a solder 15 solidarizing the contact pad 2 to the contact support 13.
  • the manufacturing method according to the invention applies in particular to vacuum interrupters of circuit breakers using the so-called axial magnetic field cleavage technique, as shown in FIG. figure 6 , or radial magnetic field as shown on the figure 7 , the slots 4 being oriented differently on the contact pad 2 according to the cutting technique used.
  • the invention is also applicable to similar contacts having slots belonging to electrical switching devices. So, according to the realization of the bulb illustrated on the figure 6 , the slots 16 are radial, while according to the embodiment of the bulb illustrated on the figure 7 the slots 17 are orthoradial.
  • the number of segments constituting the pellet is at least two, the maximum limitation being determined by the technological limits of elaboration.
  • the method of manufacturing contact pads according to the invention is applicable to any pad intended for the manufacture of contacts comprising slots for switches, circuit breakers, contactors with vacuum technology or other, in the fields of the average , low or high voltage, whatever its destination, from the moment when the pellet can be segmented into several elementary forms without any slot involving mechanical embrittlement of the piece to be sintered.
  • the invention can be used for contact pads consisting of contact material compositions for cutting short circuit currents (circuit breakers) or load currents (switches), occasionally or with high electrical endurance (contactors), for example contacts made of Cu-Cr with a mass percentage of chromium of between 10% and 60%.
  • a method of manufacturing a contact pad which is particularly economical, has a reduced implementation means. Indeed, the elementary part being of smaller dimensions than the final pellet, the implementation means used (for example a pelletizing press) are reduced and require less investment.
  • the invention also makes it possible to produce complex slot shapes that can hardly be obtained by machining. In addition, this type of elemental petal is easily achievable directly to the sides by metallurgy powders, this being more difficult for whole pellets because of the slots.
  • the invention is not limited to the embodiments described and illustrated which have been given by way of example.

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  • Manufacture Of Switches (AREA)
  • Powder Metallurgy (AREA)

Abstract

The method involves identifying and forming four elemental parts (3a-3d) of a contact pad (2), where the elemental parts are formed by sintering. The elemental parts are assembled to obtain the contact pad in its final form e.g. disc form. Radial or orthoradial shaped slits (4) are formed by opposite edges (4a, 4b) of the two adjacent elemental parts (3a, 3b). The assembled elemental parts are fixed on a contact support by a solder joint. An independent claim is also included for a contact pad comprising elemental parts.

Description

La présente invention concerne un procédé de fabrication de pastilles de contact pour un appareil de coupure électrique, ladite pastille de contact comportant au moins une fente, ainsi qu'une pastille de contact réalisée suivant le procédé précédemment mentionné.The present invention relates to a method for manufacturing contact pads for an electrical breaking device, said contact pad comprising at least one slot, and a contact pad made according to the method mentioned above.

La fabrication des contacts électriques est réalisée de manière connue de la façon suivante. Tout d'abord, une préforme est réalisée consistant en un cylindre de diamètre légèrement supérieur au diamètre final du contact et d'épaisseur, celle du contact après usinage. Cette préforme est frittée, calibrée puis recuite afin de conférer au contact, les propriétés physico-chimiques souhaitées comprenant la conductivité électrique souhaitée.
Cette préforme est ensuite usinée pour donner au contact sa forme finale. La forme du contact contribue à la fonction coupure des ampoules à vide, notamment avec l'usinage des fentes. Cette fabrication se termine par une étape d'ébavurage, cette étape ayant pour objectif d'enlever tout angle vif laissé éventuellement par des copeaux d'usinage et affectant la tenue diélectrique du contact dans l'ampoule à vide.
Ainsi, on peut distinguer deux grandes étapes pour la réalisation d'un contact électrique : La première est une étape métallurgique de frittage de la préforme et d'obtention des propriétés physico-chimiques finales, la seconde est une étape d'usinage. Cette dernière étape ne possède pas vraiment de valeur ajoutée dans la fabrication du contact.
Ce coût d'usinage est d'autant plus important que certains fournisseurs réalisent une opération d'ébavurage manuelle, opération nécessaire dans les zones inaccessibles à des outillages, telles que le bout des fentes usinées.The manufacture of the electrical contacts is carried out in a known manner as follows. Firstly, a preform is made consisting of a cylinder of diameter slightly greater than the final diameter of the contact and thickness, that of the contact after machining. This preform is sintered, calibrated and then annealed in order to give the contact the desired physicochemical properties including the desired electrical conductivity.
This preform is then machined to give the contact its final shape. The shape of the contact contributes to the breaking function of the vacuum bulbs, especially with the machining of the slots. This fabrication ends in a deburring step, this step having for objective to remove any sharp angle possibly left by machining chips and affecting the dielectric strength of the contact in the vacuum bottle.
Thus, two main steps can be distinguished for producing an electrical contact: The first is a metallurgical step of sintering the preform and obtaining the final physicochemical properties, the second is a machining step. This last step does not really have any added value in the manufacture of the contact.
This machining cost is all the more important as some suppliers perform a manual deburring operation, a necessary operation in areas inaccessible to tools, such as the end of machined slots.

La présente invention résout ces inconvénients et propose un procédé de fabrication des pastilles de contact pour un appareil de coupure électrique, de mise en oeuvre aisée et présentant un coût réduit, ainsi qu'une pastille de contact obtenue au moyen de ce procédé.The present invention solves these disadvantages and proposes a method of manufacturing contact pads for an electrical breaking device, easy to implement and having a reduced cost, and a contact pad obtained by means of this method.

A cet effet, la présente invention a pour objet un procédé de fabrication de pastilles de contact pour un appareil de coupure électrique, ladite pastille de contact comportant au moins une fente, ce procédé étant caractérisé en ce qu'il comporte au moins une étape d'identification et de réalisation d'une pièce élémentaire de la pastille de contact, ladite pièce ne comportant pas de fente et pouvant être reproduite plusieurs fois pour former, après un assemblage approprié desdites pièces, une pastille de contact dans sa forme finale, et une étape d'assemblage desdits pièces élémentaires de manière à obtenir ladite pastille de contact dans sa forme finale, les fentes étant réalisées par deux bords en regard de deux pièces élémentaires adjacentes.For this purpose, the subject of the present invention is a method for manufacturing contact pads for an electrical switching device, said contact pad comprising at least one least one slot, this method being characterized in that it comprises at least one step of identifying and producing an elementary piece of the contact pad, said piece having no slot and can be reproduced several times to form after a suitable assembly of said parts, a contact pad in its final form, and a step of assembling said elementary pieces so as to obtain said contact pad in its final form, the slots being made by two edges facing two adjacent elementary parts.

Selon une caractéristique particulière de l'invention, entre les étapes de réalisation et d'assemblage précitées, ledit procédé comporte une étape de calibrage puis de recuisson, lesdites étapes de calibrage et de recuisson étant destinées à conférer les propriétés physico-chimiques appropriées audit matériau de contact électrique des pièces élémentaires précitées.According to a particular characteristic of the invention, between the above-mentioned production and assembly steps, said method comprises a calibration and annealing step, said calibration and annealing steps being intended to confer the appropriate physicochemical properties on said material. electrical contact of the aforementioned elementary parts.

Selon une autre caractéristique, après les étapes de calibrage et de recuisson, ledit procédé comporte une étape d'ébavurage.According to another characteristic, after the calibration and annealing steps, said method comprises a deburring step.

Selon une autre caractéristique, après l'étape d'assemblage, ledit procédé comporte une étape de fixation dudit assemblage sur un support de contact.According to another characteristic, after the assembly step, said method comprises a step of fixing said assembly on a contact support.

Selon une autre caractéristique particulière, les étapes de calibrage et d'assemblage des pièces élémentaires sont réalisées simultanément au moyen d'une pièce de frittage assurant la tenue mécanique du contact.According to another particular characteristic, the steps of calibration and assembly of the elementary parts are performed simultaneously by means of a sintering part ensuring the mechanical strength of the contact.

Selon une autre caractéristique, les pièces élémentaires sont réalisées par frittage.According to another characteristic, the elementary parts are produced by sintering.

L'invention a encore pour objet une pièce élémentaire de pastille de contact, ladite pièce ne comportant pas de fente et étant susceptible d'être reproduite plusieurs fois pour former, après un assemblage approprié de ces pièces, une pastille de contact dans sa forme finale, ladite pastille comportant des fentes, chacune des fentes étant réalisée par deux bords en regard appartenant respectivement à deux pièces élémentaires adjacentes.The subject of the invention is also an elementary piece of contact pad, said piece having no slot and being capable of being reproduced several times in order to form, after an appropriate assembly of these pieces, a contact pad in its final form. said slot having slots, each of the slots being made by two facing edges respectively belonging to two adjacent elementary pieces.

Selon une caractéristique particulière, cette pièce est formée par un quart d'anneau relié sur une partie de sa circonférence extérieure à une partie en forme de bec, cette partie présentant un bord périphérique circulaire formant le bord périphérique circulaire de la pastille de contact et un bord intérieur rectiligne destiné à former avec le bord latéral extérieur d'une pièce élémentaire adjacente, une fente rectiligne orthoradiale de la pastille de contact et un bord extérieur latéral destiné à former avec le bord intérieur rectiligne d'une pièce élémentaire adjacente une seconde fente orthoradiale.According to a particular feature, this part is formed by a quarter ring connected on a part of its outer circumference to a beak-shaped portion, this part having a circular peripheral edge forming the circular peripheral edge of the contact pad and a rectilinear inner edge for forming with the outer side edge of an adjacent elementary piece, an orthoradial rectilinear slot of the contact pad and a lateral outer edge for forming with the straight inner edge of an adjacent elementary piece a second orthoradial slot .

La présente invention a encore pour objet une pastille de contact, cette pastille étant caractérisée en ce qu'elle est constituée par au moins deux pièces élémentaires comportant les caractéristiques précédemment mentionnées prises seules ou en combinaison.Another subject of the present invention is a contact pad, this pad being characterized in that it consists of at least two elementary pieces having the previously mentioned characteristics taken alone or in combination.

Selon une autre caractéristique, les fentes appartenant à la pastille de contact sont de forme radiale ou orthoradiale.According to another characteristic, the slots belonging to the contact patch are of radial or orthoradial form.

La présente invention a encore pour objet un appareil de coupure électrique et une ampoule à vide comportant au moins une pastille de contact, ladite pastille comportant les caractéristiques précédemment mentionnées prises seules ou en combinaison.The present invention further relates to an electric switchgear and a vacuum interrupter comprising at least one contact pad, said pad having the aforementioned characteristics taken alone or in combination.

Mais d'autres avantages et caractéristiques de l'invention apparaîtront mieux dans la description détaillée qui suit et se réfère aux dessins annexés donnés uniquement à titre d'exemple et dans lesquels :

  • La figure 1 est une vue en perspective d'une pastille de contact selon l'art antérieur,
  • La figure 2 est une vue en perspective d'une pastille de contact selon l'invention,
  • La figure 3 est une vue en perspective d'une pièce élémentaire de pastille de contact selon l'invention,
  • La figure 4 est une vue en perspective, illustrant une pastille de contact selon l'invention avant sa fixation sur un support de contact,
  • La figure 5 est une vue en perspective d'une pastille de contact et d'une pièce de frettage selon l'invention,
  • Les figures 6 et 7 sont deux vues en perspective, illustrant respectivement deux réalisations différentes d'une pastille de contact.
But other advantages and features of the invention will become more apparent in the detailed description which follows and refers to the accompanying drawings given solely by way of example and in which:
  • The figure 1 is a perspective view of a contact pad according to the prior art,
  • The figure 2 is a perspective view of a contact pad according to the invention,
  • The figure 3 is a perspective view of an elementary piece of contact pad according to the invention,
  • The figure 4 is a perspective view, illustrating a contact pad according to the invention before it is fixed on a contact support,
  • The figure 5 is a perspective view of a contact pad and a hooping piece according to the invention,
  • The Figures 6 and 7 are two perspective views, respectively illustrating two different embodiments of a contact pad.

Sur la figure 1, on voit une pastille de contact 1 selon l'art antérieur, destinée à étre montée à l'extrémité d'un contact fixe ou mobile dans une ampoule à vide, cette ampoule à vide étant destinée notamment à être intégrée à un disjoncteur électrique moyenne tension afin de réaliser la coupure d'un circuit électrique en cas de défaut. De manière connue en soi, cette ampoule à vide comprend une enveloppe cylindrique à l'intérieur de laquelle sont logées deux contacts d'arc respectivement un contact d'arc fixe et un contact d'arc mobile, ce contact mobile étant apte à être déplacé à l'intérieur de l'enveloppe entre deux positions respectivement une position de fermeture des contacts et une position d'ouverture des contacts.
Selon cette réalisation de l'art antérieur, cette pastille de contact 1 est monobloc et a été réalisée par frettage, puis usinage des fentes.
Sur la figure 2, une pastille de contact 2 fabriquée selon le procédé de l'invention est illustrée.
La première étape du procédé consiste à identifier la forme d'une pièce élémentaire 3 ne comportant pas de fente, laquelle pièce étant destinée à être reproduite en un certain nombre d'exemplaires, ces pièces élémentaires 3 étant ensuite destinées à être assemblées de manière à former une pastille 2 en forme de disque comportant des fentes 4.
La pièce élémentaire 3 est fabriquée par exemple par frittage sans usinage supplémentaire. Les fentes 4 de la pastille de contact 2 sont réalisées par deux bords en regard 4a,4b appartenant respectivement à deux pièces élémentaires adjacentes 3a,3b.
Selon la réalisation illustrée sur les figures 1 à 4, la pastille 2 est constituée par quatre pièces élémentaires 3a,3b,3c,3d telles que celle illustrée sur la figure 3, lesdites pièces étant assemblées de manière à former une pastille entière. Telle qu'illustrée sur la figure 3, chacune des pièces élémentaires 3 est formée par un quart d'anneau 5 relié sur une partie de sa circonférence extérieure 6 par une partie en forme de bec 7, cette partie 7 présentant un bord périphérique circulaire 8 formant le bord périphérique circulaire de la pastille de contact 2, une bord intérieur rectiligne 9 et un bord latéral extérieur 10. Le bord intérieur rectiligne 9 d'une pièce élémentaire 3a forme avec le bord rectiligne extérieur 10a d'une pièce adjacente 3d une fente orthoradiale 11. De même, le bord extérieur latéral 10 de la pièce élémentaire 3a forme avec le bord intérieur rectiligne 9a d'une pièce élémentaire adjacente 3b une fente rectiligne orthoradiale 11a de la pastille de contact 2.
Après fabrication de la pièce élémentaire par exemple par frittage, ladite pièce élémentaire est calibrée, puis recuite, afin de conférer au matériau de ladite pièce les propriétés physico-chimiques escomptées du matériau de contact.
La pièce ainsi fabriquée peut être ébavurée par des moyens industriels (par exemple par passage au tonneau). L'un des bords de la pièce élémentaire constituant un bord de fente, la difficulté de l'usinage des bords des fentes qui existait lorsque la pastille de contact entière était usinée, est alors supprimée.
Le contact est ensuite reconstitué par assemblage final des différentes pièces élémentaires et fixation de cet ensemble par une brasure 12 sur un support de contact 13.
Ainsi, cette pièce élémentaire étant de dimensions plus petites que la pastille finale, les moyens de mise en oeuvre, par exemple comprenant une presse à pastiller, sont réduits et nécessitent moins d'investissement.
On notera que les étapes de calibrage et d'assemblage des formes élémentaires peuvent être réalisées simultanément à l'aide d'une pièce de frettage 14, assurant la tenue mécanique du contact, une brasure 15 solidarisant la pastille de contact 2 au support de contact 13.
Le procédé de fabrication selon l'invention s'applique notamment aux ampoules à vide des disjoncteurs utilisant la technique de coupure dite à champ magnétique axial, telles que représentées sur la figure 6, ou à champ magnétique radial telles que représentées sur la figure 7, les fentes 4 étant orientées différemment sur la pastille de contact 2 suivant la technique de coupure utilisée.
L'invention s'applique également aux contacts similaires comportant des fentes appartenant aux appareils de coupure électriques.
Ainsi, selon la réalisation de l'ampoule illustrée sur la figure 6, les fentes 16 sont radiales, tandis que selon la réalisation de l'ampoule illustrée sur la figure 7, les fentes 17 sont orthoradiales.On the figure 1 , we see a contact pad 1 according to the prior art, intended to be mounted at the end of a fixed or movable contact in a vacuum lamp, this vacuum bulb being intended in particular to be integrated into a medium electrical circuit breaker voltage in order to cut an electrical circuit in the event of a fault. In a manner known per se, this vacuum interrupter comprises a cylindrical envelope inside which are housed two arcing contacts respectively a fixed arcing contact and a movable arcing contact, this movable contact being able to be moved. inside the casing between two positions respectively a closing position of the contacts and a position of opening of the contacts.
According to this embodiment of the prior art, this contact pad 1 is in one piece and was made by shrinking, then machining the slots.
On the figure 2 a contact pad 2 made according to the method of the invention is illustrated.
The first step of the method consists in identifying the shape of an elementary piece 3 having no slot, which part is intended to be reproduced in a certain number of copies, these elementary pieces 3 then being intended to be assembled in such a way as to forming a disk-shaped pellet 2 having slots 4.
The elementary part 3 is manufactured for example by sintering without additional machining. The slots 4 of the contact pad 2 are formed by two facing edges 4a, 4b respectively belonging to two adjacent elementary pieces 3a, 3b.
According to the illustrated realization on the Figures 1 to 4 , the pellet 2 is constituted by four elementary pieces 3a, 3b, 3c, 3d such as that illustrated on FIG. figure 3 said pieces being assembled to form a whole pellet. As illustrated on the figure 3 each of the elementary pieces 3 is formed by a ring quarter 5 connected on a part of its outer circumference 6 by a beak-shaped part 7, this part 7 having a circular peripheral edge 8 forming the circular peripheral edge of the contact pad 2, a rectilinear inner edge 9 and an outer lateral edge 10. The rectilinear inner edge 9 of an elementary piece 3a forms with the outer rectilinear edge 10a of a adjacent part 3d an orthoradial slot 11. Similarly, the lateral outer edge 10 of the elementary part 3a forms with the rectilinear inner edge 9a of an adjacent elementary piece 3b an orthoradial rectilinear slot 11a of the contact pad 2.
After manufacture of the elementary part for example by sintering, said elementary part is calibrated, then annealed, in order to give the material of said part the expected physicochemical properties of the contact material.
The piece thus manufactured can be deburred by industrial means (for example by passing the barrel). One of the edges of the elementary piece constituting a slot edge, the difficulty of machining the edges of the slots that existed when the entire contact pad was machined, is then removed.
The contact is then reconstituted by final assembly of the various elementary parts and fixing of this assembly by a solder 12 on a contact support 13.
Thus, this elementary part being smaller in size than the final pellet, the means of implementation, for example comprising a pelletizing press, are reduced and require less investment.
It will be noted that the steps for calibrating and assembling the elementary shapes can be performed simultaneously with the aid of a shrinking piece 14, ensuring the mechanical strength of the contact, a solder 15 solidarizing the contact pad 2 to the contact support 13.
The manufacturing method according to the invention applies in particular to vacuum interrupters of circuit breakers using the so-called axial magnetic field cleavage technique, as shown in FIG. figure 6 , or radial magnetic field as shown on the figure 7 , the slots 4 being oriented differently on the contact pad 2 according to the cutting technique used.
The invention is also applicable to similar contacts having slots belonging to electrical switching devices.
So, according to the realization of the bulb illustrated on the figure 6 , the slots 16 are radial, while according to the embodiment of the bulb illustrated on the figure 7 the slots 17 are orthoradial.

Le nombre de segments constituant la pastille est au minimum de deux, la limitation maximale étant déterminée par les limites technologiques d'élaboration.
Le procédé de fabrication de pastilles de contact selon l'invention s'applique à toute pastille destinée à la fabrication de contacts comportant des fentes pour les interrupteurs, les disjoncteurs, les contacteurs à technologie dans le vide ou autres, dans les domaines de la moyenne, de la basse ou de la haute tension, quelque soit sa destination, dés l'instant où la pastille peut être segmentée en plusieurs formes élémentaires sans aucune fente impliquant une fragilisation mécanique de la pièce à fritter.The number of segments constituting the pellet is at least two, the maximum limitation being determined by the technological limits of elaboration.
The method of manufacturing contact pads according to the invention is applicable to any pad intended for the manufacture of contacts comprising slots for switches, circuit breakers, contactors with vacuum technology or other, in the fields of the average , low or high voltage, whatever its destination, from the moment when the pellet can be segmented into several elementary forms without any slot involving mechanical embrittlement of the piece to be sintered.

L'invention peut être utilisée pour des pastilles de contact constituées de compositions de matériau de contact destinées à couper des courants de court-circuit (disjoncteurs) ou des courants de charge (interrupteurs), occasionnellement ou avec une endurance électrique élevée (contacteurs), par exemple des contacts constitués de Cu-Cr avec un pourcentage en masse de chrome compris entre 10 % et 60 %.
On a donc réalisé selon l'invention, un procédé de fabrication d'une pastille de contact, particulièrement économique, présentant des moyens de mise en oeuvre réduits.
En effet, la pièce élémentaire étant de dimensions plus petites que la pastille finale, les moyens de mise en oeuvre utilisés (exemple une presse à pastiller) sont réduits et nécessitent moins d'investissement.
L'invention permet également de réaliser des formes de fente complexes qui peuvent difficilement être obtenues par usinage.
En outre, ce type de pétale élémentaire est facilement réalisable directement aux cotes par métallurgie des poudres, ceci étant plus difficile pour des pastilles entières à cause des fentes.
Bien entendu, l'invention n'est pas limitée aux modes de réalisations décrits et illustrés qui n'ont été donnés qu'à titre d'exemple.The invention can be used for contact pads consisting of contact material compositions for cutting short circuit currents (circuit breakers) or load currents (switches), occasionally or with high electrical endurance (contactors), for example contacts made of Cu-Cr with a mass percentage of chromium of between 10% and 60%.
Thus, according to the invention, a method of manufacturing a contact pad, which is particularly economical, has a reduced implementation means.
Indeed, the elementary part being of smaller dimensions than the final pellet, the implementation means used (for example a pelletizing press) are reduced and require less investment.
The invention also makes it possible to produce complex slot shapes that can hardly be obtained by machining.
In addition, this type of elemental petal is easily achievable directly to the sides by metallurgy powders, this being more difficult for whole pellets because of the slots.
Of course, the invention is not limited to the embodiments described and illustrated which have been given by way of example.

Au contraire, l'invention comprend tous lés équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci sont réalisées suivant son esprit.On the contrary, the invention includes all the technical equivalents of the means described and their combinations if they are carried out according to its spirit.

Claims (12)

Procédé de fabrication de pastilles de contact pour un appareil de coupure électrique, ladite pastille de contact comportant au moins une fente, caractérisé en ce qu'il comporte : - au moins une étape d'identification et de réalisation d'une pièce élémentaire (3a,3b,3c,3d) de la pastille de contact (2), ladite pièce ne comportant pas de fente (4) et pouvant être reproduite plusieurs fois pour former, après un assemblage approprié desdites pièces, une pastille de contact (2) dans sa forme finale, et - une étape d'assemblage desdits pièces élémentaires de manière à obtenir ladite pastille de contact dans sa forme finale, les fentes (4) étant réalisées par deux bords en regard (4a,4b) de deux pièces élémentaires adjacentes . A method of manufacturing contact pads for an electrical breaking apparatus, said contact pad having at least one slot, characterized in that it comprises: at least one step of identifying and producing an elementary piece (3a, 3b, 3c, 3d) of the contact pad (2), said piece having no slot (4) and being able to be reproduced several times to form, after an appropriate assembly of said parts, a contact patch (2) in its final form, and - A step of assembling said elementary parts so as to obtain said contact pad in its final form, the slots (4) being formed by two facing edges (4a, 4b) of two adjacent elementary pieces. Procédé de fabrication de pastilles de contact selon la revendication 1, caractérisé en ce qu'entre les étapes de réalisation et d'assemblage précitées, ledit procédé comporte une étape de calibrage puis de recuisson, lesdites étapes de calibrage et de recuisson étant destinées à conférer les propriétés physico-chimiques appropriées audit matériau de contact électrique des pièces élémentaires précitées (3a,3b,3c,3d).Method for manufacturing contact pads according to claim 1, characterized in that, between the above-mentioned production and assembly steps, said method comprises a calibration and annealing step, said calibration and annealing steps being intended to confer the physico-chemical properties appropriate to said electrical contact material of the aforementioned elementary pieces (3a, 3b, 3c, 3d). Procédé de fabrication de pastilles de contact selon la revendication 2, caractérisé en ce qu'après les étapes de calibrage et de recuisson, ledit procédé comporte une étape d'ébavurage.A method of manufacturing contact pads according to claim 2, characterized in that after the sizing and annealing steps, said method comprises a deburring step. Procédé de fabrication de pastilles de contact selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'après l'étape d'assemblage, ledit procédé comporte une étape de fixation dudit assemblage sur un support de contact (13).Method of manufacturing contact pads according to any one of claims 1 to 3, characterized in that after the assembly step, said method comprises a step of fixing said assembly on a contact support (13). Procédé de fabrication de pastilles de contact selon la revendication 2, caractérisé en ce que les étapes de calibrage et d'assemblage des pièces élémentaires (3a,3b,3c,3d) sont réalisées simultanément au moyen d'une pièce de frettage (14) assurant la tenue mécanique du contact.A method of manufacturing contact pads according to claim 2, characterized in that the steps of sizing and assembling the elementary pieces (3a, 3b, 3c, 3d) are performed simultaneously by means of a hooping piece (14) ensuring the mechanical strength of the contact. Procédé de fabrication de pastilles de contact selon l'une quelconque des revendications précédentes, caractérisé en ce que les pièces élémentaires (3a,3b,3c,3d) sont réalisées par frittage.Method of manufacturing contact pads according to any one of the preceding claims, characterized in that the elementary parts (3a, 3b, 3c, 3d) are made by sintering. Pièce élémentaire de pastille de contact, ladite pièce (3a,3b,3c,3d) ne comportant pas de fente et étant susceptible d'être reproduite plusieurs fois pour former, après un assemblage approprié de ces pièces, une pastille de contact (2) dans sa forme finale, ladite pastille comportant des fentes, chacune des fentes (4) étant réalisée par deux bords (4a,4b) en regard appartenant respectivement à deux pièces élémentaires adjacentes.Elementary piece of contact pad, said piece (3a, 3b, 3c, 3d) having no slot and being capable of being reproduced several times to form, after an appropriate assembly of these pieces, a contact pad (2) in its final form, said pad having slots, each of the slots (4) being formed by two edges (4a, 4b) opposite respectively belonging to two adjacent elementary pieces. Pièce élémentaire de pastille de contact (3a) selon la revendication 7, caractérisée en ce qu'elle est formée par un quart d'anneau (5) relié sur une partie de sa circonférence extérieure (6) à une partie en forme de bec (7), cette partie en forme de bec (7) présentant un bord périphérique circulaire (8) formant le bord périphérique circulaire de la pastille de contact (2) et un bord intérieur rectiligne (9) destiné à former avec le bord latéral extérieur (10a) d'une pièce élémentaire adjacente (3d), une fente rectiligne orthoradiale (11) de la pastille de contact (2), et un bord extérieur latéral (10) destiné à former avec le bord intérieur rectiligne (9a) d'une pièce élémentaire adjacente (3b) une seconde fente orthoradiale (11).Elementary piece of contact pad (3a) according to Claim 7, characterized in that it is formed by a ring quarter (5) connected on a part of its outer circumference (6) to a beak-shaped part ( 7), said nose-shaped portion (7) having a circular peripheral edge (8) forming the circular peripheral edge of the contact pad (2) and a straight inner edge (9) for forming with the outer lateral edge ( 10a) of an adjacent elementary piece (3d), an orthoradial rectilinear slot (11) of the contact pad (2), and a lateral outer edge (10) for forming with the straight inner edge (9a) of a adjacent elementary piece (3b) a second orthoradial slot (11). Pastille de contact, caractérisée en ce qu'elle est constituée par au moins deux pièces élémentaires (3a,3b,3c,3d) selon la revendication 7 ou 8.Contact patch, characterized in that it consists of at least two elementary parts (3a, 3b, 3c, 3d) according to claim 7 or 8. Pastille de contact selon la revendication 9, caractérisée en ce que les fentes (4) appartenant à la pastille de contact (2) sont de forme radiale ou orthoradiale.Contact pad according to claim 9, characterized in that the slots (4) belonging to the contact pad (2) are of radial or orthoradial form. Appareil de coupure électrique comportant au moins une pastille de contact (2) selon la revendication 9 ou 10.Electrical breaking device comprising at least one contact pad (2) according to claim 9 or 10. Ampoule à vide comportant au moins une pastille de contact (2) selon la revendication 9 ou 10.Vacuum bulb having at least one contact pad (2) according to claim 9 or 10.
EP08354064A 2007-10-12 2008-09-29 Method of manufacturing contact pads for electrical switchgear and button obtained according to this method Active EP2048675B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0707166A FR2922355B1 (en) 2007-10-12 2007-10-12 METHOD FOR MANUFACTURING CONTACTING PELLETS FOR AN ELECTRIC CUTTING APPARATUS AND CONTACT PUTTY OBTAINED ACCORDING TO THIS METHOD

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EP2048675A1 true EP2048675A1 (en) 2009-04-15
EP2048675B1 EP2048675B1 (en) 2010-08-25

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EP (1) EP2048675B1 (en)
CN (1) CN101409163B (en)
AT (1) ATE479192T1 (en)
DE (1) DE602008002299D1 (en)
FR (1) FR2922355B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2969367B1 (en) * 2010-12-17 2013-04-26 Schneider Electric Ind Sas ELECTRIC CUTTING APPARATUS

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2454157A1 (en) * 1974-11-14 1976-05-26 Siemens Ag Vacuum switching tube with contact discs - has contacts divided in separated segments coupled to common current lead via chokes
EP0185211A2 (en) * 1984-11-22 1986-06-25 Hitachi, Ltd. Vacuum circuit breaker

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3422949A1 (en) * 1984-06-19 1985-12-19 Siemens AG, 1000 Berlin und 8000 München VACUUM SWITCH TUBES WITH A COIL TO GENERATE A MAGNETIC FIELD
JP2002334641A (en) * 2001-05-09 2002-11-22 Meidensha Corp Vacuum circuit breaker electrode and manufacturing method of the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2454157A1 (en) * 1974-11-14 1976-05-26 Siemens Ag Vacuum switching tube with contact discs - has contacts divided in separated segments coupled to common current lead via chokes
EP0185211A2 (en) * 1984-11-22 1986-06-25 Hitachi, Ltd. Vacuum circuit breaker

Also Published As

Publication number Publication date
CN101409163B (en) 2013-05-29
FR2922355B1 (en) 2009-12-04
FR2922355A1 (en) 2009-04-17
CN101409163A (en) 2009-04-15
EP2048675B1 (en) 2010-08-25
ATE479192T1 (en) 2010-09-15
DE602008002299D1 (en) 2010-10-07

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