EP0711614B1 - Method for assembling two metal banks - Google Patents
Method for assembling two metal banks Download PDFInfo
- 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
- Authority
- 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
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 44
- 239000002184 metal Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000011248 coating agent Substances 0.000 claims abstract description 38
- 238000000576 coating method Methods 0.000 claims abstract description 38
- 238000005219 brazing Methods 0.000 claims abstract description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000005304 joining Methods 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 6
- 239000011701 zinc Substances 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 4
- 239000000956 alloy Substances 0.000 claims abstract description 4
- 239000004411 aluminium Substances 0.000 claims abstract description 3
- 238000002844 melting Methods 0.000 claims description 12
- 230000008018 melting Effects 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 abstract description 10
- 230000004927 fusion Effects 0.000 abstract description 6
- 238000003466 welding Methods 0.000 description 9
- 239000010410 layer Substances 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 3
- 238000005476 soldering Methods 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 241000287107 Passer Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241001080024 Telles Species 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/03—Application 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
- B21D39/031—Joining 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.
Landscapes
- 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
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
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.
- 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.
- 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
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
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
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
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
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
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
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
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
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
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
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
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
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)
- 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).
- 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.
- 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.
- 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.
- 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%.
- 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.
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 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0711614A1 EP0711614A1 (en) | 1996-05-15 |
EP0711614B1 true EP0711614B1 (en) | 1998-04-15 |
Family
ID=9468589
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95401925A Expired - Lifetime EP0711614B1 (en) | 1994-11-08 | 1995-08-22 | Method for assembling two metal banks |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0711614B1 (en) |
AT (1) | ATE165023T1 (en) |
DE (1) | DE69502072T2 (en) |
ES (1) | ES2116698T3 (en) |
FR (1) | FR2726494B1 (en) |
Cited By (1)
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)
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)
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)
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 |
-
1994
- 1994-11-08 FR FR9413337A patent/FR2726494B1/en not_active Expired - Fee Related
-
1995
- 1995-08-22 AT AT95401925T patent/ATE165023T1/en not_active IP Right Cessation
- 1995-08-22 DE DE69502072T patent/DE69502072T2/en not_active Expired - Fee Related
- 1995-08-22 EP EP95401925A patent/EP0711614B1/en not_active Expired - Lifetime
- 1995-08-22 ES ES95401925T patent/ES2116698T3/en not_active Expired - Lifetime
Patent Citations (1)
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)
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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