EP0711614B1 - Method for assembling two metal banks - Google Patents

Method for assembling two metal banks Download PDF

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Publication number
EP0711614B1
EP0711614B1 EP95401925A EP95401925A EP0711614B1 EP 0711614 B1 EP0711614 B1 EP 0711614B1 EP 95401925 A EP95401925 A EP 95401925A EP 95401925 A EP95401925 A EP 95401925A EP 0711614 B1 EP0711614 B1 EP 0711614B1
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EP
European Patent Office
Prior art keywords
sheet
metal
blanks
coating
punch
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.)
Expired - Lifetime
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EP95401925A
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German (de)
French (fr)
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EP0711614A1 (en
Inventor
Thierry Marquais
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Sollac SA
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Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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Publication of EP0711614A1 publication Critical patent/EP0711614A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/03Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal otherwise than by folding
    • B21D39/031Joining superposed plates by locally deforming without slitting or piercing

Definitions

  • the present invention relates to a method of assembling two sheet metal blanks, at least one of which is coated on at least one of its faces with a metallic coating.
  • point clinched The mechanical strength of such an assembly point, called point clinched, is sometimes considered too weak, especially in pure traction.
  • the resistance mechanical in pure tension of a clinched point is of the order of 80 to 140 DaN depending on the technology and tools used, and the mechanical strength of a point clinch in tension-shear is of the order of 150 to 280 DaN, always depending on the technology and the tools used.
  • the main drawback of this assembly technique is its corrosion resistance.
  • the technique consists, using a punch and of a matrix, to make two stampings so as to form, in each sheets from one side, a cavity and on the other side a projection, the projection of the first sheet being inserted into the cavity of the second sheet, said cavity of the second sheet having, near its bottom, a widening while the projection of the first sheet has a flare housed in said enlargement.
  • corrosion agents such as that for example simply humidity, or water, which will stagnate and promote corrosion of the sheets at the assembly point.
  • Another solution for joining two sheet metal blanks is to use the resistance welding technique.
  • Such a welded point has very good mechanical strength, greater than 300 DaN in pure tension and in shear tension.
  • the spot resistance welding technique requires that the sheet blanks to be assembled are overlapped over at least 20 mm. This is what is known in the automotive field as the fallen edge, and it turns out that a fallen edge of 20 mm is penalizing in the automobile.
  • the spot resistance welding technique is a technique that requires a large amount of energy, electrical intensity necessary for welding being of the order of 10 kA, or even more, which generates a significant cost.
  • the coating pollutes the welding electrodes, thus reducing their duration of life.
  • the present invention relates to a method of assembling two sheet metal blanks whose mechanical strength of the assembly points is greater than that of the so-called clinched points, and which does not have the disadvantages associated with the resistance welding spot technique.
  • the present invention relates to a process for assembling two sheet metal blanks, at least one of which is coated on at least one of its faces with a metallic coating, in which we superimpose the two sheet blanks and we realize at least one point of assembly by cold creep of the type in which one practices simultaneously in the two sheet metal blanks using a punch and a matrix a cavity, for example circular, said cavities being thus housed one inside the other and having an enlargement in the vicinity of the bottom, characterized in that the two sheet blanks are superimposed so that the coated side of the coated sheet blank is in contact with one side of the other sheet blank, and in that we pass between the punch and the die a electric current for soldering said assembly point.
  • the subject of the invention is a method of assembling two blanks metallic 1, 2, at least one of which is coated on at least one of its faces a metallic coating.
  • the two sheet blanks 1 and 2 are each coated on one of their faces of a metal coating layer, respectively 4 and 5.
  • one or both sheet metal blanks 1, 2 can be coated on both sides with a layer of metallic coating.
  • the first step in the assembly process is to overlap the two sheet blanks 1, 2.
  • the second step of the assembly process according to the invention consists in making at least one cold-flow assembly point of the type in which we practice simultaneously in the two sheet blanks using with a punch and a die a cavity, for example circular, rectangular or other, said cavities being thus housed one inside the other and having an enlargement in the vicinity of the bottom, passing between the punch and the matrix an electric current of soldering of said point assembly when said punch is at the end of the stroke.
  • the two sheet blanks 1 and 2 are placed in a device for producing an assembly point by cold creep, i.e. between a matrix 6 and a blank holding device 7 - punch 8.
  • the assembly point training device must have a punch and a matrix both conductors of electricity, the punch being electrically isolated from the punch holder (not shown) and the matrix holder matrix (not shown), a current generator electrical (not shown) and a system of electrical contactors level of the punch and of the die (not shown).
  • the goal is that by Joule effect due to the passage of current between punch 8 and die 6, so at the interface between the two sheets, we create a brazing point 12 of the two sheet blanks 1 and 2, the layer of metallic coating 3, 4 or 5 serving as brazing, as has been shown in figure 4.
  • the intensity of the brazing current must be such that it allows to obtain in the assembly point at the interface between the two sheet blanks 1 and 2, by Joule effect, a temperature between the melting temperature of the metal coating 3, 4, 5 minus 20% and the melting temperature of said coating.
  • the intensity of the current of soldering is such that it allows to obtain in the assembly point to the interface between the two sheet blanks 1 and 2, by Joule effect, a temperature between the melting temperature of the metal coating 3, 4, 5 minus 20% and the melting temperature of said coating. minus 10%.
  • the method according to the invention as described above is particularly effective for the assembly of two blanks of steel sheet at least one of which is coated on at least one of its faces with a coating based on one or more elements among zinc, aluminum, nickel and their alloys, and when the two sheet blanks are coated on at least one of their faces with an identical metallic coating.
  • a first sample was made by making a point assembly according to the prior art, said clinch point and a second sample was produced by performing an assembly point according to the invention passing between the punch and the die when the punch is finished an electric current of 1 kA for 1 second.
  • the two points assembly were carried out with punches and dies of form identical and effort exerted between the punch and the die also identical.
  • point shear tensile strength assembly of the prior art is equal to 170 DaN, it is equal at 265 DaN for the assembly point according to the invention, i.e. a gain of more 50%.
  • the advantage of assembly method according to the invention is that it reduces the edge dropped to a value of 12 to 15 mm compared to the 20 mm needed to make a welded stitch.
  • the required electrical intensity is at least ten times less which has a significant economic advantage.
  • the method of assembling two sheet blanks according to the invention finds particular application in the field of household appliances and the automobile.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Resistance Welding (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Laminated Bodies (AREA)
  • Secondary Cells (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)

Abstract

The procedure, esp. for joining two sheet components where at least one has a metal coating, consists of placing the two sheets together so that the coating is on the inside and forming at least one fastening point by a cold creep procedure. The next step is using a die (8) and a matrix (6) to form a cavity with an enlarged base, and passing an electric brazing current between the die and matrix when the die is at the end of its travel. The electric current is designed to produce a temperature between the two sheet components which lies between the fusion temperature of the metal coating less 20 per cent and the fusion temperature of the coating. The metal coating is based on one or more elements selected from zinc, aluminium, nickel and their alloys.

Description

La présente invention concerne un procédé d'assemblage de deux flans de tôle métallique dont un au moins est revêtu sur au moins une de ses faces d'un revêtement métallique.The present invention relates to a method of assembling two sheet metal blanks, at least one of which is coated on at least one of its faces with a metallic coating.

Il est connu pour assembler deux flans de tôle métallique, par exemple dans le document FR 2 691 388, de superposer les deux flans de tôle et de réaliser au moins un point d'a ssemblage par fluage à froid du type dans lequel on pratique simultanément dans les deux flans de tôle à l'aide d'un poinçon et d'une matrice une cavité circulaire, lesdites cavités étant ainsi logées l'une dans l'autre et présentant au voisinage du fond un élargissement.It is known to assemble two sheet metal blanks, by example in document FR 2 691 388, to superimpose the two blanks of sheet metal and to produce at least one cold-flow assembly point of the type in which we practice simultaneously in the two sheet blanks using a punch and a die a circular cavity, said cavities thus being housed one inside the other and presenting in the vicinity of the bottom a enlargement.

Cette technique d'assemblage mécanique de deux flans de tôle est connue sous le nom de clinchage, et est très souvent utilisée dans le domaine de l'électroménager ainsi que dans le domaine automobile, dans le cadre de l'assemblage de pièces non visibles.This technique of mechanical assembly of two sheet blanks is known as clinching, and is very often used in the appliance sector as well as in the automotive field, in the part of the assembly of parts not visible.

La tenue mécanique d'un tel point d'assemblage, appelé point clinché, est parfois considérée comme trop faible, surtout en traction pure. Par exemple, pour des tôles galvanisées de 0,8 mm d'épaisseur, la tenue mécanique en traction pure d'un point clinché est de l'ordre de 80 à 140 DaN selon la technologie et les outils utilisés, et la tenue mécanique d'un point clinché en traction-cisaillement est de l'ordre de 150 à 280 DaN, toujours selon la technologie et les outils utilisés.The mechanical strength of such an assembly point, called point clinched, is sometimes considered too weak, especially in pure traction. For example, for 0.8 mm thick galvanized sheets, the resistance mechanical in pure tension of a clinched point is of the order of 80 to 140 DaN depending on the technology and tools used, and the mechanical strength of a point clinch in tension-shear is of the order of 150 to 280 DaN, always depending on the technology and the tools used.

L'inconvénient principal de cette technique d'assemblage est sa tenue à la corrosion. En effet, la technique consiste, à l'aide d'un poinçon et d'une matrice, à réaliser deux emboutis de manière à former, dans chacune des tôles à partir d'une face, une cavité et sur l'autre face une saillie, la saillie de la première tôle étant insérée dans la cavité de la seconde tôle, ladite cavité de la seconde tôle présentant, au voisinage de son fond, un élargissement tandis que la saillie de la première tôle comporte un évasement logé dans ledit élargissement. Entre la saillie de la première tôle et la cavité de la seconde tôle peuvent pénétrer des agents de corrosion, tels que par exemple tout simplement de l'humidité, ou de l'eau, qui vont stagner et favoriser la corrosion des tôles au niveau du point d'assemblage.The main drawback of this assembly technique is its corrosion resistance. Indeed, the technique consists, using a punch and of a matrix, to make two stampings so as to form, in each sheets from one side, a cavity and on the other side a projection, the projection of the first sheet being inserted into the cavity of the second sheet, said cavity of the second sheet having, near its bottom, a widening while the projection of the first sheet has a flare housed in said enlargement. Between the projection of the first sheet and the cavity of the second sheet can penetrate corrosion agents, such as that for example simply humidity, or water, which will stagnate and promote corrosion of the sheets at the assembly point.

Une autre solution pour assembler deux flans de tôle métallique consiste à utiliser la technique du soudage par résistance. Another solution for joining two sheet metal blanks is to use the resistance welding technique.

Pour cela on place les deux flans à assembler en recouvrement et on réalise un point soudé en faisant passer un courant de soudage entre deux électrodes situées en vis-à-vis de part et d'autre des flans.For this we place the two blanks to be assembled in overlap and we realize a welded point by passing a welding current between two electrodes located opposite each side of the blanks.

Un tel point soudé présente une très bonne tenue mécanique, supérieure à 300 DaN en traction pure et en traction cisaillement.Such a welded point has very good mechanical strength, greater than 300 DaN in pure tension and in shear tension.

En revanche cette technique présente quelques inconvénients.However, this technique has some drawbacks.

Lorsque les flans de tôle sont revêtus, par exemple d'un revêtement anticorrosion, le soudage provoque un brûlage dudit revêtement ce qui est préjudiciable à la tenue à la corrosion des flans de tôle au niveau des points soudés.When the sheet blanks are coated, for example with a anticorrosion coating, welding causes said coating to burn which is detrimental to the corrosion resistance of the sheet metal blanks at the level welded points.

La technique du soudage par résistance par point nécessite que les flans de tôle à assembler soient en recouvrement sur au moins 20 mm. C'est ce que l'on appelle dans le domaine automobile le bord tombé, et il s'avère qu'un bord tombé de 20 mm est pénalisant dans l'automobile.The spot resistance welding technique requires that the sheet blanks to be assembled are overlapped over at least 20 mm. This is what is known in the automotive field as the fallen edge, and it turns out that a fallen edge of 20 mm is penalizing in the automobile.

Enfin, la technique du soudage par résistance par point est une technique qui nécessite une grande quantité d'énergie, l'intensité électrique nécessaire au soudage étant de l'ordre de 10 kA, voire plus, ce qui engendre un coût important.Finally, the spot resistance welding technique is a technique that requires a large amount of energy, electrical intensity necessary for welding being of the order of 10 kA, or even more, which generates a significant cost.

De plus, lorsque les flans de tôle dont revêtus sur les deux faces ou que les faces revêtues sont les faces extérieures de l'assemblage, le revêtement pollue les électrodes de soudage, diminuant ainsi leur durée de vie.In addition, when the sheet metal blanks of which coated on both faces or that the coated faces are the exterior faces of the assembly, the coating pollutes the welding electrodes, thus reducing their duration of life.

La présente invention a pour objet un procédé d'assemblage de deux flans de tôle dont la tenue mécanique des points d'assemblage est supérieure à celle des points dits clinchés, et qui ne présente pas les inconvénients liés à la technique du soudage par résistance par points.The present invention relates to a method of assembling two sheet metal blanks whose mechanical strength of the assembly points is greater than that of the so-called clinched points, and which does not have the disadvantages associated with the resistance welding spot technique.

La présente invention concerne un procédé d'assemblage de deux flans de tôle métallique dont un au moins est revêtu sur au moins une de ses faces d'un revêtement métallique, dans lequel on superpose les deux flans de tôle et on réalise au moins un point d'assemblage par fluage à froid du type dans lequel on pratique simultanément dans les deux flans de tôle à l'aide d'un poinçon et d'une matrice une cavité, par exemple circulaire, lesdites cavités étant ainsi logées l'une dans l'autre et présentant au voisinage du fond un élargissement, caractérisé en ce qu' on superpose les deux flans de tôle de manière que la face revêtue du flan de tôle revêtu soit en contact avec une face de l'autre flan de tôle, et en ce qu'on fait passer entre le poinçon et la matrice un courant électrique de brasage dudit point d'assemblage.The present invention relates to a process for assembling two sheet metal blanks, at least one of which is coated on at least one of its faces with a metallic coating, in which we superimpose the two sheet blanks and we realize at least one point of assembly by cold creep of the type in which one practices simultaneously in the two sheet metal blanks using a punch and a matrix a cavity, for example circular, said cavities being thus housed one inside the other and having an enlargement in the vicinity of the bottom, characterized in that the two sheet blanks are superimposed so that the coated side of the coated sheet blank is in contact with one side of the other sheet blank, and in that we pass between the punch and the die a electric current for soldering said assembly point.

Selon d'autres caractéristiques préférées de l'invention :

  • les deux flans de tôle métallique sont chacun revêtus sur au moins une de leurs faces, et on superpose les deux flans de tôle de manière qu'une face revêtue du premier flan de tôle soit en contact avec une face revêtue de l'autre flan de tôle,
  • on fait passer le courant électrique de brasage entre le poinçon et la matrice lorsque ledit poinçon est en fin de course,
  • l'intensité du courant électrique de brasage est telle qu'elle permet d'obtenir dans le point d'assemblage à l'interface entre les deux flans de tôle, par effet Joule, une température comprise entre la température de fusion du revêtement métallique moins 20 % et la température de fusion du revêtement métallique, de préférence comprise entre la température de fusion du revêtement métallique moins 20 % et la température de fusion du revêtement métallique moins 10 %,
  • le revêtement métallique est un revêtement à base de l'un ou plusieurs éléments parmi le zinc, l'aluminium, le nickel et leurs alliages.
According to other preferred characteristics of the invention:
  • the two sheet metal blanks are each coated on at least one of their faces, and the two sheet blanks are superimposed so that one side coated with the first sheet blank is in contact with one side coated with the other blank sheet metal,
  • the electric brazing current is passed between the punch and the die when said punch is at the end of its travel,
  • the intensity of the electric brazing current is such that it makes it possible to obtain, in the assembly point at the interface between the two sheet blanks, by the Joule effect, a temperature between the melting temperature of the metal coating minus 20% and the melting temperature of the metallic coating, preferably between the melting temperature of the metallic coating minus 20% and the melting temperature of the metallic coating minus 10%,
  • the metallic coating is a coating based on one or more elements among zinc, aluminum, nickel and their alloys.

Les caractéristiques et avantages apparaítront mieux à la suite de la description qui va suivre, donnée uniquement à titre d'exemple, faite en référence aux dessins annexés, sur lesquels :

  • les figures 1 à 3 représentent trois étapes de réalisation d'un point d'assemblage de deux flans de tôle selon le procédé de l'invention,
  • la figure 4 représente une vue en perspective coupée d'un point d'assemblage selon l'invention.
The characteristics and advantages will appear more clearly from the description which follows, given solely by way of example, made with reference to the appended drawings, in which:
  • FIGS. 1 to 3 represent three stages in the production of an assembly point for two sheet metal blanks according to the method of the invention,
  • Figure 4 shows a perspective view cut from an assembly point according to the invention.

L'invention a pour objet un procédé d'assemblage de deux flans métallique 1, 2, dont un au moins est revêtu sur au moins une de ses faces d'un revêtement métallique. The subject of the invention is a method of assembling two blanks metallic 1, 2, at least one of which is coated on at least one of its faces a metallic coating.

Dans l'exemple de réalisation représenté sur les figures 1 à 3, seul le flan de tôle 1 est revêtu d'une couche 3 de revêtement métallique, le flan de tôle 2 étant nu.In the embodiment shown in Figures 1 to 3, only the sheet blank 1 is coated with a layer 3 of metallic coating, the sheet blank 2 being bare.

En revanche dans l'exemple de réalisation représenté sur la figure 4, les deux flans de tôle 1 et 2 sont chacun revêtus sur une de leurs faces d'une couche de revêtement métallique, respectivement 4 et 5.On the other hand, in the embodiment shown on the Figure 4, the two sheet blanks 1 and 2 are each coated on one of their faces of a metal coating layer, respectively 4 and 5.

Il est bien évident que l'un ou les deux flans de tôle 1, 2 peuvent être revêtus sur leurs deux faces d'une couche de revêtement métallique.It is obvious that one or both sheet metal blanks 1, 2 can be coated on both sides with a layer of metallic coating.

La première étape du procédé d'assemblage consiste à superposer les deux flans de tôle 1, 2.The first step in the assembly process is to overlap the two sheet blanks 1, 2.

Lorsqu'un seul des deux flans de tôle 1, 2 est revêtu d'une couche 3 de revêtement métallique, on superpose les deux flans de tôle de manière que la face revêtue du flan de tôle revêtu 1 soit en contact avec une face de l'autre flan de tôle 2.When only one of the two sheet blanks 1, 2 is coated with a layer 3 of metallic coating, the two sheet metal blanks are superimposed so that the coated side of the coated sheet blank 1 is in contact with a face of the other sheet blank 2.

Lorsque les deux flans de tôle 1, 2 sont revêtus sur l'une de leurs faces d'une couche de revêtement métallique 4, 5, on superpose les deux flans de tôle 1, 2 de manière que la face du premier flan de tôle 1 munie de la couche de revêtement métallique 4 soit en contact avec la face du second flan de tôle 2 munie de la couche de revêtement métallique 5.When the two sheet blanks 1, 2 are coated on one of their faces with a layer of metallic coating 4, 5, the two sheet blanks 1, 2 so that the face of the first sheet blank 1 provided of the metallic coating layer 4 is in contact with the face of the second sheet blank 2 provided with the metal coating layer 5.

La seconde étape du procédé d'assemblage selon l'invention consiste à réaliser au moins un point d'assemblage par fluage à froid du type dans lequel on pratique simultanément dans les deux flans de tôle à l'aide d'un poinçon et d'une matrice une cavité, par exemple circulaire, rectangulaire ou autre, lesdites cavités étant ainsi logées l'une dans l'autre et présentant au voisinage du fond un élargissement, en faisant passer entre le poinçon et la matrice un courant électrique de brasage dudit point d'assemblage lorsque ledit poinçon est en fin de course.The second step of the assembly process according to the invention consists in making at least one cold-flow assembly point of the type in which we practice simultaneously in the two sheet blanks using with a punch and a die a cavity, for example circular, rectangular or other, said cavities being thus housed one inside the other and having an enlargement in the vicinity of the bottom, passing between the punch and the matrix an electric current of soldering of said point assembly when said punch is at the end of the stroke.

Cette seconde étape de réalisation d'un point d'assemblage est détaillée sur les figures 1 à 3.This second step of making an assembly point is detailed in Figures 1 to 3.

Comme on le voit sur la figure 1, les deux flans de tôle 1 et 2 sont placés dans un dispositif de réalisation d'un point d'assemblage par fluage à froid, c'est à dire entre une matrice 6 et un dispositif serre-flan 7 - poinçon 8.As seen in Figure 1, the two sheet blanks 1 and 2 are placed in a device for producing an assembly point by cold creep, i.e. between a matrix 6 and a blank holding device 7 - punch 8.

Les deux flans de tôle 1, 2 étant maintenus entre le serre-flan 7 et la matrice 6, on descend le poinçon 8 pour former dans chacun des flans de tôle 1, 2 une cavité, circulaire dans l'exemple de réalisation représenté, respectivement 9, 10, lesdites cavités étant logées l'une dans l'autre, comme représenté sur la figure 2.The two sheet metal blanks 1, 2 being held between the blank holder 7 and the matrix 6, we descend the punch 8 to form in each of the blanks sheet metal 1, 2 a cavity, circular in the embodiment shown, respectively 9, 10, said cavities being housed one inside the other, as shown in figure 2.

On continue ensuite à descendre le poinçon 8 afin de continuer à former les cavités 9, 10 de manière à ce que, par fluage à froid du métal, elles présentent au voisinage de leur fond un élargissement 11, comme représenté sur la figure 3. Cette phase est habituellement appelée phase de matage des deux flans de tôle.We then continue to descend the punch 8 in order to continue forming the cavities 9, 10 so that, by cold flow of the metal, they have in the vicinity of their bottom an enlargement 11, as shown in Figure 3. This phase is usually called the matting of the two sheet blanks.

Lorsque le poinçon est en fin de course et que le point d'assemblage est quasiment réalisé, c'est à dire pendant la phase de matage des deux flans de tôle 1 et 2, on fait passer un courant électrique de brasage dudit point d'assemblage entre le poinçon 8 et la matrice 6.When the punch is at the end of the stroke and the point assembly is almost done, i.e. during the matting phase of the two sheet blanks 1 and 2, an electric brazing current is passed of said assembly point between the punch 8 and the die 6.

Pour cela, le dispositif de formation du point d'assemblage doit comporter un poinçon et une matrice tous deux conducteurs de l'électricité, le poinçon étant isolé électriquement du porte poinçon (non représenté) et la matrice du porte matrice (non représentée), un générateur de courant électrique (non représenté) et un système de contacteurs électriques au niveau du poinçon et de la matrice (non représenté).For this, the assembly point training device must have a punch and a matrix both conductors of electricity, the punch being electrically isolated from the punch holder (not shown) and the matrix holder matrix (not shown), a current generator electrical (not shown) and a system of electrical contactors level of the punch and of the die (not shown).

Le but poursuivi est que par effet Joule dû au passage du courant entre le poinçon 8 et la matrice 6, donc à l'interface entre les deux tôles, on crée un point de brasage 12 des deux flans de tôle 1 et 2, la couche de revêtement métallique 3, 4 ou 5 servant de brasure, comme on l'a représenté sur la figure 4.The goal is that by Joule effect due to the passage of current between punch 8 and die 6, so at the interface between the two sheets, we create a brazing point 12 of the two sheet blanks 1 and 2, the layer of metallic coating 3, 4 or 5 serving as brazing, as has been shown in figure 4.

Pour cela, il faut que l'intensité du courant de brasage soit telle qu'elle permet d'obtenir dans le point d'assemblage à l'interface entre les deux flans de tôle 1 et 2, par effet Joule, une température comprise entre la température de fusion du revêtement métallique 3, 4, 5 moins 20 % et la température de fusion dudit revêtement.For this, the intensity of the brazing current must be such that it allows to obtain in the assembly point at the interface between the two sheet blanks 1 and 2, by Joule effect, a temperature between the melting temperature of the metal coating 3, 4, 5 minus 20% and the melting temperature of said coating.

De manière préférentielle, il faut que l'intensité du courant de brasage soit telle qu'elle permet d'obtenir dans le point d'assemblage à l'interface entre les deux flans de tôle 1 et 2, par effet Joule, une température comprise entre la température de fusion du revêtement métallique 3, 4, 5 moins 20 % et la température de fusion dudit revêtement. moins 10 %.Preferably, the intensity of the current of soldering is such that it allows to obtain in the assembly point to the interface between the two sheet blanks 1 and 2, by Joule effect, a temperature between the melting temperature of the metal coating 3, 4, 5 minus 20% and the melting temperature of said coating. minus 10%.

Connaissant l'épaisseur des flans de tôle 1, 2 et de leur couche de revêtement 3, 4, 5 le cas échéant, ainsi que la résistivité du matériau constitutif desdits flans de tôle et de leur revêtement, et les paramètres de l'installation, il est aisé de calculer l'intensité nécessaire pour satisfaire ces conditions.Knowing the thickness of the sheet blanks 1, 2 and their layer coating 3, 4, 5 if applicable, as well as the resistivity of the material constituting said sheet blanks and their coating, and the parameters of the installation, it is easy to calculate the intensity necessary to satisfy these conditions.

Le procédé selon l'invention tel que décrit ci-avant est particulièrement efficace pour l'assemblage de deux flans de tôle en acier dont l'un au moins est revêtu sur au moins une de ses faces d'un revêtement à base de l'un ou plusieurs éléments parmi le zinc, l'aluminium, le nickel et leurs alliages, et lorsque les deux flans de tôle sont revêtus sur au moins une de leurs faces d'un revêtement métallique identique.The method according to the invention as described above is particularly effective for the assembly of two blanks of steel sheet at least one of which is coated on at least one of its faces with a coating based on one or more elements among zinc, aluminum, nickel and their alloys, and when the two sheet blanks are coated on at least one of their faces with an identical metallic coating.

A titre d'exemple, on a réalisé l'assemblage de deux flans de tôle identiques en acier doux d'épaisseur égale à 0,8 mm revêtus chacun d'un revêtement constitué d'un alliage de zinc et d'aluminium à 99 % de zinc et 1 % d'aluminium.As an example, two blanks of identical mild steel sheet 0.8 mm thick, each coated with a coating made of an alloy of zinc and aluminum with 99% zinc and 1 % aluminum.

Un premier échantillon a été réalisé en effectuant un point d'assemblage selon la technique antérieure, dit point clinché et un second échantillon a été réalisé en effectuant un point d'assemblage selon l'invention en faisant passer entre le poinçon et la matrice lorsque le poinçon est en fin de course un courant électrique de 1 kA pendant 1 seconde. Les deux points d'assemblage ont été réalisé avec des poinçons et des matrices de forme identique et à effort exercé entre le poinçon et la matrice également identique.A first sample was made by making a point assembly according to the prior art, said clinch point and a second sample was produced by performing an assembly point according to the invention passing between the punch and the die when the punch is finished an electric current of 1 kA for 1 second. The two points assembly were carried out with punches and dies of form identical and effort exerted between the punch and the die also identical.

On a ensuite déterminé pour chaque échantillon sa résistance en traction pure et sa résistance en traction cisaillement. Les essais de traction pure et de traction cisaillement ont été effectués respectivement selon les normes NF A 87 001 pour la traction pure et NF A 89 206 pour la traction cisaillement.We then determined for each sample its resistance in pure tension and its shear tensile strength. The trials of pure traction and shear traction were performed respectively according to standards NF A 87 001 for pure traction and NF A 89 206 for the shear traction.

Alors que la résistance en traction pure du point d'assemblage de la technique antérieure est égale à 50 DaN, elle est égale à 65 DaN pour le point d'assemblage selon l'invention, soit un gain de 30 %.While the pure tensile strength of the assembly point of the prior art is equal to 50 DaN, it is equal to 65 DaN for the assembly point according to the invention, ie a gain of 30%.

De même la résistance en traction cisaillement du point d'assemblage de la technique antérieure est égale à 170 DaN, elle est égale à 265 DaN pour le point d'assemblage selon l'invention, soit un gain de plus de 50 %.Likewise the point shear tensile strength assembly of the prior art is equal to 170 DaN, it is equal at 265 DaN for the assembly point according to the invention, i.e. a gain of more 50%.

Par rapport au soudage par résistance par point, l'avantage du procédé d'assemblage selon l'invention est qu'il permet de réduire le bord tombé à une valeur de 12 à 15 mm comparé aux 20 mm nécessaires pour réaliser un point soudé. De plus l'intensité électrique nécessaire est au moins dix fois moindre ce qui présente un avantage économique non négligeable.Compared to spot resistance welding, the advantage of assembly method according to the invention is that it reduces the edge dropped to a value of 12 to 15 mm compared to the 20 mm needed to make a welded stitch. In addition, the required electrical intensity is at least ten times less which has a significant economic advantage.

Le procédé d'assemblage de deux flans de tôle selon l'invention trouve particulièrement application dans le domaine de l'électroménager et l'automobile.The method of assembling two sheet blanks according to the invention finds particular application in the field of household appliances and the automobile.

Claims (6)

  1. Method of joining two sheet-metal blanks (1, 2), at least one of which is coated on at least one of its sides with a metal coating (3), in which the two sheet-metal blanks (1, 2) are superposed and at least one joining point is produced by cold creep, of the type in which a cavity (9, 10) is made simultaneously in the two sheet-metal blanks (1, 2) using a punch (8) and a die (6), the said cavities thus being housed, one in the other, and having an enlargement (11) near the bottom, characterized in that the two sheet-metal blanks (1, 2) are superposed so that the coated side of the coated sheet-metal blank is in contact with one side of the other sheet-metal blank and in that an electric current for brazing the said joining point is passed between the punch (8) and the die (6).
  2. Joining method according to Claim 1, characterized in that the two sheet-metal blanks (1, 2) are each coated on at least one of their sides and in that the two sheet-metal blanks (1, 2) are superposed so that a coated side of the first sheet-metal blank is in contact with a coated side of the other sheet-metal blank.
  3. Method according to one of the preceding claims, characterized in that the electric brazing current is passed between the punch (8) and the die (6) when the said punch is at the end of its stroke.
  4. Method according to one of the preceding claims, characterized in that the intensity of the electric brazing current is such that it makes it possible to obtain, in the joining point at the interface between the two sheet-metal blanks (1, 2), by the Joule effect, a temperature which is between the melting point of the metal coating less 20% and the melting point of the metal coating.
  5. Method according to one of Claims 1 to 3, characterized in that the intensity of the electric brazing current is such that it makes it possible to obtain, in the joining point at the interface between the two sheet-metal blanks (1, 2), by the Joule effect, a temperature which is between the melting point of the metal coating less 20% and the melting point of the metal coating less 10%.
  6. Method according to one of the preceding claims, characterized in that the metal coating is a coating based on one or more elements taken from zinc, aluminium, nickel and alloys thereof.
EP95401925A 1994-11-08 1995-08-22 Method for assembling two metal banks Expired - Lifetime EP0711614B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9413337 1994-11-08
FR9413337A FR2726494B1 (en) 1994-11-08 1994-11-08 METHOD FOR ASSEMBLING TWO SHEETS OF METAL SHEET

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Publication Number Publication Date
EP0711614A1 EP0711614A1 (en) 1996-05-15
EP0711614B1 true EP0711614B1 (en) 1998-04-15

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EP95401925A Expired - Lifetime EP0711614B1 (en) 1994-11-08 1995-08-22 Method for assembling two metal banks

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EP (1) EP0711614B1 (en)
AT (1) ATE165023T1 (en)
DE (1) DE69502072T2 (en)
ES (1) ES2116698T3 (en)
FR (1) FR2726494B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5602960B1 (en) * 2014-01-16 2014-10-08 武延 本郷 Joining jig, manufacturing method of joined body, and joined body

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2502683B1 (en) * 2011-03-23 2014-08-27 SMP Deutschland GmbH Hybrid material compound and a method and device for producing same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2691388A1 (en) * 1992-05-21 1993-11-26 Homax Ag New assembly joint for sheets - having two discs with circular cavity which widens to form a swelling extending to the interior, etc.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63132733A (en) * 1986-11-25 1988-06-04 Toyota Motor Corp Caulking method by electric conduction
JPH0475731A (en) * 1990-07-05 1992-03-10 Sumitomo Light Metal Ind Ltd Manufacture of aluminum brazed honecomb panel
JP2514481B2 (en) * 1991-05-28 1996-07-10 村井 正輔 Welding method for metal plate and method for forming projection for welding positioning

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2691388A1 (en) * 1992-05-21 1993-11-26 Homax Ag New assembly joint for sheets - having two discs with circular cavity which widens to form a swelling extending to the interior, etc.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5602960B1 (en) * 2014-01-16 2014-10-08 武延 本郷 Joining jig, manufacturing method of joined body, and joined body

Also Published As

Publication number Publication date
DE69502072D1 (en) 1998-05-20
ATE165023T1 (en) 1998-05-15
ES2116698T3 (en) 1998-07-16
FR2726494A1 (en) 1996-05-10
DE69502072T2 (en) 1998-12-10
EP0711614A1 (en) 1996-05-15
FR2726494B1 (en) 1996-12-13

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