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EP1066894A1 - Method of assembling at least two metallic elements for creating a metallic structure - Google Patents

Method of assembling at least two metallic elements for creating a metallic structure Download PDF

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Publication number
EP1066894A1
EP1066894A1 EP99202194A EP99202194A EP1066894A1 EP 1066894 A1 EP1066894 A1 EP 1066894A1 EP 99202194 A EP99202194 A EP 99202194A EP 99202194 A EP99202194 A EP 99202194A EP 1066894 A1 EP1066894 A1 EP 1066894A1
Authority
EP
European Patent Office
Prior art keywords
elements
section
hem
assembly
along
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.)
Withdrawn
Application number
EP99202194A
Other languages
German (de)
French (fr)
Inventor
Richard Kergen
Pascal Magain
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ArcelorMittal Liege Upstream SA
Original Assignee
Cockerill Sambre SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Cockerill Sambre SA filed Critical Cockerill Sambre SA
Priority to EP99202194A priority Critical patent/EP1066894A1/en
Priority to DE60001502T priority patent/DE60001502T2/en
Priority to BR0012356-0A priority patent/BR0012356A/en
Priority to AT00945472T priority patent/ATE233139T1/en
Priority to CA002373908A priority patent/CA2373908A1/en
Priority to KR1020027000113A priority patent/KR20020043545A/en
Priority to US10/019,289 priority patent/US6857812B1/en
Priority to AU59564/00A priority patent/AU5956400A/en
Priority to PCT/BE2000/000080 priority patent/WO2001002110A1/en
Priority to EP00945472A priority patent/EP1192016B1/en
Publication of EP1066894A1 publication Critical patent/EP1066894A1/en
Withdrawn legal-status Critical Current

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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
    • B21D39/02—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 by folding, e.g. connecting edges of a sheet to form a cylinder
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49616—Structural member making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49936—Surface interlocking
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
    • Y10T29/49941—Peripheral edge joining of abutting plates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/49—Member deformed in situ
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/49—Member deformed in situ
    • Y10T403/4966—Deformation occurs simultaneously with assembly
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/49—Member deformed in situ
    • Y10T403/4991—Both members deformed

Definitions

  • the present invention relates to a method of assembling at least two metallic elements in order to create a structure, at least one of the two elements with a very high yield strength and its application to realize (beam) structures of complex form from simple elements, not requiring no significant deformations.
  • the idea is to decompose an element of structure of complex shape, usually achieved by inconsistent stamping operations with steels with high mechanical characteristics, in in simple elements, made using folding type forming, and assembled by hem.
  • the objective is to significantly reduce the weight of structures by using as little metal as possible.
  • These structures the crates of motor vehicle for example are obtained by often complex parts assembled by stamping.
  • steels with high mechanical characteristics.
  • these steels have a limit elasticity between 400 and 1500 MPa.
  • These steels are produced by steel processes and processes of mass known per se, which allow to offer steels whose cost price is close to that of steels at classic carbon. The interest then lies in the fact that we can get a lightening of the structure not negligible.
  • the elements constitutive of the same structure often have complex shapes obtained by stamping processes involving significant deformations and therefore incompatible with poor formatting capabilities of these steels.
  • the present invention aims to provide a method of assembling at least two metallic elements or component parts of which at least one of the two is made of steel with a very high limit of elasticity in order to produce structural parts of complex form by breaking down these complex forms into simple elements, achievable using setting operations in shape not involving significant deformation, and therefore compatible with steels with high characteristics mechanical.
  • the present invention relates to a method of assembling at least two metallic elements one of which, at least, has a high or very high elastic limit along a junction section in view of creating a more complex structure, characterized in that assembly is done by hem crimping the along the section where the elements join.
  • At least one of the elements is made of preferably in steel with yield strength greater than 400 MPa or aluminum with a limit elasticity greater than 200 MPa.
  • the ratio of the radius of hem at the sum of the thicknesses of the different elements that we want to assemble along the junction section is between 2 and 10.
  • the ratio of the difference between the radius and thickness of the outermost metal with the thickness of the innermost metal is, advantageously greater than 2.
  • the process is also characterized by the fact that the junction is not necessarily straight but may have local curvature, the radius of curvature preferably being greater than five radii hem exteriors.
  • the present invention also relates to the product obtained by the assembly process described above, characterized in that it is in the form at least two metallic elements having, along a junction section, a hem.
  • the product is in the form of a double-core "I" beam, obtained by assembling four components connected by four hems the along the junction section of the four elements taken two by two.
  • the product results from the assembly of two elements by two hems so as to form a section closed, at least one of the two elements having a U section.
  • Figures 1 describe a structure carried out in a conventional manner having a geometry in "U”.
  • Figures 2 show the elements simple constituents in order to create the same kind of structure as that shown in FIGS. 1 according to the assembly method of the present invention.
  • Figures 3 show a tool allowing the realization of a structure as described in Figure 2.
  • Figure 4 shows variants assembly orientation for a U-shaped structure.
  • Figures 5 show a shape more complex execution of a structure with a closed section obtained by the assembly process of the present invention.
  • Figure 6 shows the tool used to make a closed structure as shown in Figure 5.
  • Figure 7 shows another form execution of a structure having the form of a double-beam "I" beam.
  • Figure 8 shows the tool for production and assembly of an I-beam with a core double.
  • FIG. 9 represents a part of the type shield crosspiece.
  • FIG. 10 represents a part of the type middle foot.
  • Figure 11 represents a part presenting tabs at the ends to facilitate assembly.
  • Figure 1 shows the usual mode of production of a U-shaped geometry piece. type of part is obtained by stamping from a flat sheet as shown schematically in Figure la. As part steels with very high yield strength, stamping of such a room poses severe problems of control of the elastic return: the shape obtained deviates appreciably of the ideal shape as shown in Figure 1b. Of critical problems due to low formability of this type of steel occur, for example when the height of the U-section varies significantly as shown in the figure lc or when the height of the section remains constant, the curvature of the U-beam varies locally so sensitive (Figure 1d).
  • Parts 1, 2 and 3 can be obtained by folding or lifting the edge. These bet techniques in shape only involve small deformations in the sheet plane and are compatible with steels with very high yield strength with low capacity forming.
  • Figure 3 shows a typical tool allowing the realization of this type of part using of a press.
  • the side elements 1 or 2 and the bottom 3 are prepared for hemming as shown in 5. These parts produced using press operations are presented in the tool described in Figure 3.
  • the left half-view shows the closed tool, before the hem, the left view shows the tool when the hem is finished.
  • Elements 7, 7 'and 9 are supported on the upper slide of the press by through springs not shown and whose crush stroke is greater than tool stroke 8, 8 'forming the hem.
  • the springs are compressed and press, by through parts 7 and 9, parts 1, 2 and 3 against part 10 which follows their shape and rests on the press table.
  • element 8 which is directly connected to it shape the hem as shown on the right side of the figure 3.
  • Parts 1, 2 and 3 are not necessarily all high-limit steel elasticity: for example, depending on the function of the part, only part 3 can be made of very high limit steel of elasticity, the steel parts 1 and 2 having a better formability and better weldability, allowing easy assembly of the part to the rest of the structure with assembly processes such as spot welding.
  • the process allows also to adapt thicknesses to requirements structural parts: the three parts 1, 2 and 3 may have different thicknesses, the process hem assembly accepting thicknesses significantly different, with a ratio greater than of them.
  • the method also makes it possible to carry out closed sections as shown in Figure 5.
  • the part 11 can be obtained by simple folding, a variation of the closed section being obtained by varying the height of the folded edges. Exhibit 12 which closes the section is even simpler in shape.
  • the part 11 can also be produced by deep drawing of steel with lower yield strength, less than 400 MPa for example, part 12 being in steel with very high yield strength and playing the role of reinforcement.
  • Element 15 holds parts 10 and 11 against the 17-17 'element which rests on the lower table of the press.
  • closed structure is based on the assembly of parts by 4 hems.
  • a typical section corresponding to this application is presented in figure 7. Parts 22, 22 'are assembled by hem with the parts 21 and 21'.
  • Figure 8 presents a tool allowing hem this section to the hurry.
  • Exhibits 21 and 22 are prepared for the hem formation as indicated in 23: they received a preform which initiates the hem.
  • the pieces are then placed in the tooling which is composed of the elements mobile 20 and 20 ', 19 and 19'. These elements are first apart, horizontally for 20 and 20 ', vertically for 19 and 19 '.
  • the parts 22 and 22 'are deposited on the elements 20 and 20 'and maintained in the same way. All type 18 tools (18 ', 18 '', 18 '') are then in the position indicated for the tool 18.
  • the tools 18 are then moved, successively or simultaneously to form the hem and find in the position indicated by 18 ', 18' ', 18' ''.
  • This type of tool can be mounted on a press, elements 19, 18 and 18 'being implemented by the slide upper of the press: 19 is mounted on springs and its stroke is limited by a stop not shown. The element 19 'rests on the press table and is therefore fixed, the tools 18 "and 18 '' 'being activated by the slide bottom of the press.
  • This type of assembly method by press tool makes it possible to form shapes whose section is not constant: the distance between the pieces 21 and 21 'as well as the distance between parts 22 and 22' may vary.
  • the technique allows for complex shaped structures with steels having a very low ductility taking advantage of the productivity of the hem assembly process and the reinforcement it brings to the structure. It also helps to spare at the ends of the pieces of metal tabs making it easy to assemble these parts to the rest of the automotive structure.
  • FIGS 8 to 10 describe some specific applications.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Body Structure For Vehicles (AREA)
  • Connection Of Plates (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Electric Connection Of Electric Components To Printed Circuits (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Ceramic Products (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

The invention concerns a method for assembling at least two simple sheet metal elements (1, 2, 3,; 11, 12, 21, 21', 22, 22') for producing a structural part with open section, preferably U-shaped, or closed section, at least one of the metal elements having a high or very high yield strength and low deformability. The invention is characterised in that the metal elements are formed by at least a folding process; the metal elements are arranged relative to each other along a junction section; the metal elements are assembled by a crimped lap-joint (4) along the junction section of said elements.

Description

Objet de l'inventionSubject of the invention

La présente invention se rapporte à un procédé d'assemblage d'au moins deux éléments métalliques en vue de créer une structure, au moins un des deux éléments présentant une très haute limite d'élasticité et à son application pour réaliser des structures (de poutre) de forme complexe à partir d'éléments simples, ne demandant pas de déformations importantes.The present invention relates to a method of assembling at least two metallic elements in order to create a structure, at least one of the two elements with a very high yield strength and its application to realize (beam) structures of complex form from simple elements, not requiring no significant deformations.

L'idée est de décomposer un élément de structure de forme complexe, réalisé habituellement par des opérations de mise à forme par emboutissage peu compatibles avec des aciers à hautes caractéristiques mécaniques, en sous éléments simples, réalisés à l'aide d'opération de formage de type pliage, et assemblés par ourlet.The idea is to decompose an element of structure of complex shape, usually achieved by inconsistent stamping operations with steels with high mechanical characteristics, in in simple elements, made using folding type forming, and assembled by hem.

Etat de la techniqueState of the art

Dans le domaine de la construction mécanique et en particulier de l'automobile, l'objectif est de réduire sensiblement le poids des structures en utilisant le moins de métal possible. Ces structures, les caisses de véhicule automobile par exemple, sont obtenues par assemblage de pièces souvent complexes, réalisées par emboutissage. Afin de réduire l'épaisseur du métal utilisé pour réaliser ces structures en conservant les propriétés mécaniques des dites structures, il faut utiliser des aciers présentant des caractéristiques mécaniques élevées. Des nuances d'aciers au carbone faiblement alliés présentant de hautes caractéristiques mécaniques, mais souvent associées à une capacité de mise en forme par déformation limitée, sont aujourd'hui disponibles.In the field of mechanical engineering and in particular of the automobile, the objective is to significantly reduce the weight of structures by using as little metal as possible. These structures, the crates of motor vehicle for example are obtained by often complex parts assembled by stamping. In order to reduce the thickness of the metal used to create these structures while retaining the properties mechanical of said structures, it is necessary to use steels with high mechanical characteristics. Low-alloy carbon steel grades with high mechanical characteristics, but often associated with a fitness capacity by limited deformation, are available today.

Typiquement, ces aciers présentent une limite d'élasticité située entre 400 et 1500 MPa. Ces aciers sont produits par des processus et procédés sidérurgiques de masse connus en soi, qui permettent de proposer des aciers dont le prix de revient est voisin de celui des aciers au carbone classiques. L'intérêt réside alors dans le fait que l'on peut obtenir un allégement de la structure non négligeable. Cependant, de par leur faible capacité de mise en forme, de par une soudabilité parfois médiocre, ces aciers posent des problèmes spécifiques de mise en oeuvre, et en particulier d'assemblage.Typically, these steels have a limit elasticity between 400 and 1500 MPa. These steels are produced by steel processes and processes of mass known per se, which allow to offer steels whose cost price is close to that of steels at classic carbon. The interest then lies in the fact that we can get a lightening of the structure not negligible. However, due to their low bet capacity in shape, due to sometimes poor weldability, these steels pose specific implementation problems, and in particular of assembly.

Plus particulièrement, les éléments constitutifs d'une même structure présentent souvent des formes complexes obtenues par des procédés d'emboutissage impliquant des déformations importantes et donc incompatibles avec les faibles capacités de mise en forme de ces aciers.More specifically, the elements constitutive of the same structure often have complex shapes obtained by stamping processes involving significant deformations and therefore incompatible with poor formatting capabilities of these steels.

Buts de l'inventionAims of the invention

La présente invention vise à proposer un procédé d'assemblage d'au moins deux éléments métalliques ou pièces constitutives dont au moins un des deux est réalisé dans un acier présentant une très haute limite d'élasticité en vue de réaliser des pièces de structure de forme complexe en décomposant ces formes complexes en éléments simples, réalisables à l'aide d'opérations de mise en forme n'impliquant pas de déformations importantes, et donc compatibles avec les aciers à hautes caractéristiques mécaniques.The present invention aims to provide a method of assembling at least two metallic elements or component parts of which at least one of the two is made of steel with a very high limit of elasticity in order to produce structural parts of complex form by breaking down these complex forms into simple elements, achievable using setting operations in shape not involving significant deformation, and therefore compatible with steels with high characteristics mechanical.

Principaux éléments caractéristiques de l'inventionMain characteristic features of the invention

La présente invention se rapporte à un procédé d'assemblage d'au moins deux éléments métalliques dont l'un, au moins, présente une haute ou très haute limite d'élasticité le long d'une section de jonction en vue de créer une structure plus complexe, caractérisé en ce que l'assemblage est effectué par sertissage par ourlet le long de la section de jonction des éléments entre eux.The present invention relates to a method of assembling at least two metallic elements one of which, at least, has a high or very high elastic limit along a junction section in view of creating a more complex structure, characterized in that assembly is done by hem crimping the along the section where the elements join.

Au moins un des éléments est réalisé de préférence dans un acier présentant une limite d'élasticité supérieur à 400 MPa ou un aluminium avec une limite d'élasticité supérieure à 200 MPa.At least one of the elements is made of preferably in steel with yield strength greater than 400 MPa or aluminum with a limit elasticity greater than 200 MPa.

Avantageusement, le rapport du rayon de l'ourlet à la somme des épaisseurs des différents éléments que l'on désire assembler le long de la section de jonction est compris entre 2 et 10.Advantageously, the ratio of the radius of hem at the sum of the thicknesses of the different elements that we want to assemble along the junction section is between 2 and 10.

De plus, le rapport de la différence entre le rayon et l'épaisseur du métal le plus extérieur avec l'épaisseur du métal le plus intérieur est, avantageusement supérieur à 2.In addition, the ratio of the difference between the radius and thickness of the outermost metal with the thickness of the innermost metal is, advantageously greater than 2.

La nature ou l'épaisseur des différents éléments peut ne pas être identique pour tous les éléments.The nature or thickness of the different elements may not be the same for all elements.

Le procédé est également caractérisé par le fait que la jonction n'est pas nécessairement rectiligne mais peut présenter une courbure locale, le rayon de courbure étant de préférence supérieur à cinq rayons extérieurs d'ourlet.The process is also characterized by the fact that the junction is not necessarily straight but may have local curvature, the radius of curvature preferably being greater than five radii hem exteriors.

La présente invention concerne également le produit obtenu par le procédé d'assemblage décrit ci-dessus, caractérisé en ce qu'il se présente sous la forme d'au moins deux éléments métalliques présentant, le long d'une section de jonction, un ourlet. The present invention also relates to the product obtained by the assembly process described above, characterized in that it is in the form at least two metallic elements having, along a junction section, a hem.

Sous une première forme préférée de l'invention, le produit se présente sous la forme d'une poutre en "I" à âme double, obtenue par l'assemblage de quatre éléments constitutifs reliés par quatre ourlets le long de la section de jonction des quatre éléments pris deux à deux.In a first preferred form of the invention, the product is in the form of a double-core "I" beam, obtained by assembling four components connected by four hems the along the junction section of the four elements taken two by two.

Sous une deuxième forme préférée de l'invention, le produit résulte de l'assemblage de deux éléments par deux ourlets de façon à former une section fermée, un des deux éléments au moins présentant une section en U.In a second preferred form of the invention, the product results from the assembly of two elements by two hems so as to form a section closed, at least one of the two elements having a U section.

Brève description des dessinsBrief description of the drawings

Les figures 1 décrivent une structure réalisée de manière classique présentant une géométrie en "U".Figures 1 describe a structure carried out in a conventional manner having a geometry in "U".

Les figures 2 représentent les éléments constitutifs simples en vue de créer le même genre de structure que celle représentée aux figures 1 selon le procédé d'assemblage de la présente invention.Figures 2 show the elements simple constituents in order to create the same kind of structure as that shown in FIGS. 1 according to the assembly method of the present invention.

Les figures 3 représentent un outil permettant la réalisation d'une structure telle que décrite à la figure 2.Figures 3 show a tool allowing the realization of a structure as described in Figure 2.

La figure 4 représente des variantes d'orientation d'assemblage pour une structure en U.Figure 4 shows variants assembly orientation for a U-shaped structure.

Les figures 5 représentent une forme d'exécution plus complexe d'une structure possédant une section fermée et obtenue selon le procédé d'assemblage de la présente invention.Figures 5 show a shape more complex execution of a structure with a closed section obtained by the assembly process of the present invention.

La figure 6 représente l'outil mis en oeuvre pour réaliser une structure fermée telle que représentée à la figure 5.Figure 6 shows the tool used to make a closed structure as shown in Figure 5.

La figure 7 représente une autre forme d'exécution d'une structure présentant la forme d'une poutre en "I" à âme double.Figure 7 shows another form execution of a structure having the form of a double-beam "I" beam.

La figure 8 représente l'outil permettant la réalisation et l'assemblage d'une poutre en "I" à âme double.Figure 8 shows the tool for production and assembly of an I-beam with a core double.

La figure 9 représente une pièce de type traverse de bouclier.FIG. 9 represents a part of the type shield crosspiece.

La figure 10 représente une pièce de type pied milieu.FIG. 10 represents a part of the type middle foot.

La figure 11 représente une pièce présentant des languettes aux extrémités pour faciliter l'assemblage.Figure 11 represents a part presenting tabs at the ends to facilitate assembly.

Description détaillée de plusieurs formes d'exécution de l'inventionDetailed description of several embodiments of the invention

La présente invention sera décrite plus en détails à l'aide des figures annexées, et repose sur le principe selon lequel il convient de décomposer une pièce complexe en éléments simples qui sont alors assemblés mécaniquement par ourlets.The present invention will be described in more detail details using the attached figures, and is based on principle that a part should be broken down complex into simple elements which are then assembled mechanically by hems.

La figure 1 présente le mode habituel de réalisation d'une pièce de géométrie en U. Classiquement ce type de pièce est obtenu par emboutissage à partir d'une tôle plane comme schématisé à la figure la. Dans le cadre d'aciers à très haute limite d'élasticité, l'emboutissage d'une telle pièce pose des problèmes sévères de maítrise du retour élastique : la forme obtenue s'écarte sensiblement de la forme idéale comme présenté à la figure 1b. Des problèmes critiques dus à la faible formabilité de ce type d'acier surviennent, par exemple lorsque la hauteur de la section en U varie sensiblement comme indiqué à la figure lc ou lorsque la hauteur de la section restant constante, la courbure de la poutre en U varie localement de façon sensible (figure 1d).Figure 1 shows the usual mode of production of a U-shaped geometry piece. type of part is obtained by stamping from a flat sheet as shown schematically in Figure la. As part steels with very high yield strength, stamping of such a room poses severe problems of control of the elastic return: the shape obtained deviates appreciably of the ideal shape as shown in Figure 1b. Of critical problems due to low formability of this type of steel occur, for example when the height of the U-section varies significantly as shown in the figure lc or when the height of the section remains constant, the curvature of the U-beam varies locally so sensitive (Figure 1d).

Le principe selon la présente invention proposé pour réaliser ce type de pièce est illustré aux figures 2. La pièce est décomposée en éléments simples, les côtés 1 et 2, le fond 3 qui sont assemblés par un ourlet 4.The principle according to the present invention proposed to make this type of part is illustrated in figures 2. The part is broken down into simple elements, the sides 1 and 2, the bottom 3 which are joined by a hem 4.

Les pièces 1, 2 et 3 peuvent être obtenues par pliage ou par relevage de bord. Ces techniques de mise en forme n'impliquent que de faibles déformations dans le plan de la tôle et sont compatibles avec des aciers à très haute limite d'élasticité présentant une faible capacité de formage.Parts 1, 2 and 3 can be obtained by folding or lifting the edge. These bet techniques in shape only involve small deformations in the sheet plane and are compatible with steels with very high yield strength with low capacity forming.

La figure 3 présente un outil typique permettant la réalisation de ce type de pièce à l'aide d'une presse. Les éléments latéraux 1 ou 2 et le fond 3 sont préparés pour la formation de l'ourlet comme indiqué en 5. Ces pièces réalisées à l'aide d'opération de presses simples sont présentées dans l'outil décrit à la figure 3.Figure 3 shows a typical tool allowing the realization of this type of part using of a press. The side elements 1 or 2 and the bottom 3 are prepared for hemming as shown in 5. These parts produced using press operations are presented in the tool described in Figure 3.

La demi-vue de gauche présente l'outil fermé, avant la réalisation de l'ourlet, la vue de gauche présente l'outil une fois l'ourlet terminé. Les éléments 7, 7'et 9 prennent appui sur le coulisseau supérieur de la presse par l'intermédiaire de ressorts non représentés et dont la course d'écrasement est supérieure à la course des outils 8, 8' formant l'ourlet. Dans la situation présentée à la figure 3, les ressorts sont comprimés et pressent, par l'intermédiaire des pièces 7 et 9, les pièces 1, 2 et 3 contre la pièce 10 qui épouse leur forme et repose sur la table de la presse. Lorsque le coulisseau de la presse achève sa course, l'élément 8 qui lui est directement relié forme l'ourlet comme indiqué dans la partie droite de la figure 3.The left half-view shows the closed tool, before the hem, the left view shows the tool when the hem is finished. Elements 7, 7 'and 9 are supported on the upper slide of the press by through springs not shown and whose crush stroke is greater than tool stroke 8, 8 'forming the hem. In the situation presented to the Figure 3, the springs are compressed and press, by through parts 7 and 9, parts 1, 2 and 3 against part 10 which follows their shape and rests on the press table. When the press slide ends its run, element 8 which is directly connected to it shape the hem as shown on the right side of the figure 3.

Les pièces 1, 2 et 3 ne sont pas nécessairement toutes en acier à haute limite d'élasticité : par exemple, selon la fonction de la pièce, seule la pièce 3 peut être en acier à très haute limite d'élasticité, les pièces 1 et 2 en acier présentant une meilleure capacité de mise à forme et une meilleure soudabilité, ce qui permet d'assembler facilement la pièce au reste de la structure avec des procédés d'assemblage tels que la soudure par points. Le procédé permet également d'adapter les épaisseurs aux exigences structurales de la pièce : les trois pièces 1, 2 et 3 peuvent présenter des épaisseurs différentes, le procédé d'assemblage par ourlet acceptant des épaisseurs sensiblement différentes, dont le rapport est supérieur à deux.Parts 1, 2 and 3 are not necessarily all high-limit steel elasticity: for example, depending on the function of the part, only part 3 can be made of very high limit steel of elasticity, the steel parts 1 and 2 having a better formability and better weldability, allowing easy assembly of the part to the rest of the structure with assembly processes such as spot welding. The process allows also to adapt thicknesses to requirements structural parts: the three parts 1, 2 and 3 may have different thicknesses, the process hem assembly accepting thicknesses significantly different, with a ratio greater than of them.

Des variantes d'orientation de l'ourlage sont présentées à la figure 4.Variations of hemming orientation are shown in Figure 4.

Le procédé permet également de réaliser des sections fermées comme indiqué à la figure 5. Selon la figure 5, la pièce 11 peut être obtenue par simple pliage, une variation de la section fermée étant obtenue en variant la hauteur des bords pliés. La pièce 12 qui ferme la section est de forme encore plus simple. Comme variante de ce cas, la pièce 11 peut également être réalisée par emboutissage d'un acier à plus basse limite d'élasticité, inférieure à 400 MPa par exemple, la pièce 12 étant en acier à très haute limite d'élasticité et jouant le rôle de renfort.The method also makes it possible to carry out closed sections as shown in Figure 5. According to the FIG. 5, the part 11 can be obtained by simple folding, a variation of the closed section being obtained by varying the height of the folded edges. Exhibit 12 which closes the section is even simpler in shape. As a variant of in this case, the part 11 can also be produced by deep drawing of steel with lower yield strength, less than 400 MPa for example, part 12 being in steel with very high yield strength and playing the role of reinforcement.

Un outillage typique permettant de réaliser ce type de pièce est présenté à la figure 6. Le principe est proche de celui décrit à la figure 3. Les éléments 14, 14' et 15 prennent appui sur le coulisseau supérieur de la presse par l'intermédiaire de ressorts non représentés.A typical tool allowing to realize this type of part is presented in figure 6. The principle is close to that described in FIG. 3. Elements 14, 14 'and 15 are supported on the upper slide of the press by means of springs not shown.

L'élément 15 maintient les pièces 10 et 11 contre l'élément 17-17' qui repose sur la table inférieure de la presse.Element 15 holds parts 10 and 11 against the 17-17 'element which rests on the lower table of the press.

Dans la partie gauche de la figure, la situation avant la formation de l'ourlet est représentée : le coulisseau de la presse a amené les éléments 14 et 15 en contact, les ressorts étant légèrement comprimés. La vue de droite présente la situation à la fin de la formation de l'ourlet : le coulisseau de la presse a poursuivi sa course et l'élément 16', qui lui est directement relié, a formé l'ourlet.In the left part of the figure, the situation before hem formation is shown: the press slide brought elements 14 and 15 into contact, the springs being slightly compressed. The sight of right presents the situation at the end of the formation of the hem: the press slide continued to run and the element 16 ', which is directly connected to it, has formed the hem.

Un autre mode possible de réalisation de structure fermée est basé sur l'assemblage des pièces par 4 ourlets. Une section typique correspondant à cette application est présentée à la figure 7. Les pièces 22, 22' sont assemblées par ourlet avec les pièces 21 et 21'.Another possible embodiment of closed structure is based on the assembly of parts by 4 hems. A typical section corresponding to this application is presented in figure 7. Parts 22, 22 'are assembled by hem with the parts 21 and 21'.

La figure 8 présente un outillage permettant de réaliser l'assemblage par ourlet de cette section à la presse. Les pièces 21 et 22 sont préparées en vue de la formation de l'ourlet comme indiqué en 23 : elles ont reçu une préforme qui amorce l'ourlet. Les pièces sont alors placées dans l'outillage qui est composé des éléments mobiles 20 et 20', 19 et 19'. Ces éléments sont d'abord écartés, horizontalement pour 20 et 20', verticalement pour 19 et 19'. Les pièces 21 et 21' sont déposées sur 19 et 19' respectivement et maintenues par des moyens non représentés, un système magnétique par exemple. De même, les pièces 22 et 22' sont déposées sur les éléments 20 et 20' et maintenues de même. Tous les outils de type 18 (18', 18'', 18''') sont alors dans la position indiquée pour l'outil 18. Les outils 18 sont alors déplacés, successivement ou simultanément pour former l'ourlet et se trouver dans la position indiquée par 18', 18'', 18'''. Ce type d'outillage peut être monté sur une presse, les éléments 19, 18 et 18' étant mis en oeuvre par le coulisseau supérieur de la presse : 19 est monté sur ressorts et sa course est limitée par une butée non représentée. L'élément 19' repose sur la table de la presse et est donc fixe, les outils 18" et 18''' étant mise en action par le coulisseau inférieur de la presse. Ce type de mode d'assemblage par outil de presse permet de réaliser des formes dont la section n'est pas constante : la distance entre les pièces 21 et 21' ainsi que la distance entre les pièces 22 et 22' peuvent varier.Figure 8 presents a tool allowing hem this section to the hurry. Exhibits 21 and 22 are prepared for the hem formation as indicated in 23: they received a preform which initiates the hem. The pieces are then placed in the tooling which is composed of the elements mobile 20 and 20 ', 19 and 19'. These elements are first apart, horizontally for 20 and 20 ', vertically for 19 and 19 '. The pieces 21 and 21 'are deposited on 19 and 19' respectively and maintained by means not shown, a magnetic system for example. Likewise, the parts 22 and 22 'are deposited on the elements 20 and 20 'and maintained in the same way. All type 18 tools (18 ', 18 '', 18 '') are then in the position indicated for the tool 18. The tools 18 are then moved, successively or simultaneously to form the hem and find in the position indicated by 18 ', 18' ', 18' ''. This type of tool can be mounted on a press, elements 19, 18 and 18 'being implemented by the slide upper of the press: 19 is mounted on springs and its stroke is limited by a stop not shown. The element 19 'rests on the press table and is therefore fixed, the tools 18 "and 18 '' 'being activated by the slide bottom of the press. This type of assembly method by press tool makes it possible to form shapes whose section is not constant: the distance between the pieces 21 and 21 'as well as the distance between parts 22 and 22' may vary.

Les applications potentielles concernent différents types de pièces de structure automobile comme pièces de renfort d'habitacle (traverse bouclier), pieds milieux, éléments de longeron, berceau moteur (dessins de description).Potential applications concern different types of automotive structural parts like cockpit reinforcement parts (shield cross member), feet middle, side member, engine cradle (drawings of description).

La technique permet de réaliser des structures de forme complexe avec des aciers présentant une très faible ductilité en profitant de la productivité du procédé d'assemblage par ourlet et du renforcement qu'il apporte à la structure. Elle permet également de ménager aux extrémités des pièces des languettes de métal permettant d'assembler facilement ces pièces au reste de la structure automobile.The technique allows for complex shaped structures with steels having a very low ductility taking advantage of the productivity of the hem assembly process and the reinforcement it brings to the structure. It also helps to spare at the ends of the pieces of metal tabs making it easy to assemble these parts to the rest of the automotive structure.

Les figures 8 à 10 décrivent certaines applications particulières.Figures 8 to 10 describe some specific applications.

Claims (12)

Procédé d'assemblage d'au moins deux éléments métalliques dont l'un, au moins, présente une haute ou très haute limite d'élasticité le long d'une section de jonction en vue de créer une structure plus complexe, caractérisé en ce que l'assemblage est effectué par sertissage par ourlet le long de la section de jonction des éléments entre eux.Method of assembling at least two metallic elements, at least one of which has a high or very high yield strength along a joining section to create a more structure complex, characterized in that the assembly is carried out by hem crimping along the joint section elements between them. Procédé d'assemblage selon la revendication 1, caractérisé en ce qu'au moins un des éléments est en acier et présente une limite d'élasticité supérieure à 400 MPa.Assembly process according to claim 1, characterized in that at least one of elements is made of steel and has a yield strength greater than 400 MPa. Procédé d'assemblage selon la revendication 1, caractérisé en ce qu'au moins un des éléments est en aluminium et présente une limite d'élasticité supérieure à 200 MPa.Assembly process according to claim 1, characterized in that at least one of elements is made of aluminum and has a limit elasticity greater than 200 MPa. Procédé d'assemblage selon l'une quelconque des revendications précédentes, caractérisé en ce que le rapport du rayon de l'ourlet à la somme des épaisseurs des différents éléments que l'on désire assembler le long de la section de jonction est compris entre 2 et 10.Assembly method according to one any of the preceding claims, characterized in what the ratio of the radius of the hem to the sum of thicknesses of the various elements that one wishes assemble along the joint section is included between 2 and 10. Procédé d'assemblage selon les revendications 1, 2 ou 3, caractérisé en ce que le rapport de la différence entre le rayon et l'épaisseur du métal le plus extérieur avec l'épaisseur du métal le plus intérieur est supérieur à 2.Assembly process according to claims 1, 2 or 3, characterized in that the ratio of the difference between the radius and the thickness of the metal the outermost with the thickness of the innermost metal is greater than 2. Procédé d'assemblage selon l'une quelconque des revendications précédentes, caractérisé en ce que la nature ou l'épaisseur des différents éléments n'est pas identique pour tous.Assembly method according to one any of the preceding claims, characterized in what the nature or thickness of the different elements is not the same for everyone. Procédé d'assemblage selon l'une quelconque des revendications précédentes, caractérisé en ce que la jonction n'est pas rectiligne, mais présente une courbure locale, dont le rayon est au moins supérieur à cinq fois le rayon extérieur de l'ourlet.Assembly method according to one any of the preceding claims, characterized in that the junction is not straight, but has a local curvature, whose radius is at least greater than five times the outside radius of the hem. Produit obtenu par le procédé d'assemblage décrit dans l'une quelconque des revendications précédentes, caractérisé en ce qu'il se présente sous la forme d'au moins deux éléments métalliques présentant le long d'une section de jonction un ourlet.Product obtained by the process assembly described in any of previous claims, characterized in that it present in the form of at least two metallic elements having a hem along a joining section. Produit selon la revendication 8, caractérisé en ce que le rapport du rayon de l'ourlet à la somme des épaisseurs des différents éléments que l'on assemble le long de la section de jonction est compris entre 2 et 10.Product according to claim 8, characterized in that the ratio of the radius of the hem to the sum of the thicknesses of the different elements that we assembles along the joint section is included between 2 and 10. Produit selon la revendication 8 ou 9, caractérisé en ce que le rapport de la différence entre le rayon et l'épaisseur du métal le plus extérieur avec l'épaisseur du métal le plus intérieur est supérieur à 2.Product according to claim 8 or 9, characterized in that the ratio of the difference between the radius and thickness of the outermost metal with the thickness of the innermost metal is greater than 2. Produit selon l'une quelconque des revendications 8 à 10, caractérisé en ce qu'il se présente sous la forme d'une poutre en "I" obtenue par l'assemblage de quatre éléments constitutifs reliés par quatre ourlets le long de la section de jonction des quatre éléments pris deux à deux.Product according to any of Claims 8 to 10, characterized in that it is presented in the form of an "I" beam obtained by joining of four components connected by four hems along the junction section of the four elements taken two by two. Produit selon l'une quelconque des revendications 8 à 10, caractérisé en ce qu'il résulte de l'assemblage de deux éléments par deux ourlets de façon à former une section fermée, un des deux éléments au moins présentant une section en U.Product according to any of claims 8 to 10, characterized in that it results from the joining of two elements by two hems so as to form a closed section, at least one of the two elements with a U-shaped section.
EP99202194A 1999-07-05 1999-07-05 Method of assembling at least two metallic elements for creating a metallic structure Withdrawn EP1066894A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
EP99202194A EP1066894A1 (en) 1999-07-05 1999-07-05 Method of assembling at least two metallic elements for creating a metallic structure
DE60001502T DE60001502T2 (en) 1999-07-05 2000-07-05 CONNECTION METHOD OF MINIMUM TWO METAL COMPONENTS FOR PRODUCING A STRUCTURE
BR0012356-0A BR0012356A (en) 1999-07-05 2000-07-05 Assembly process of at least two metal components to create a structure
AT00945472T ATE233139T1 (en) 1999-07-05 2000-07-05 CONNECTING METHOD OF A MINIMUM OF TWO METAL COMPONENTS TO PRODUCE A STRUCTURE
CA002373908A CA2373908A1 (en) 1999-07-05 2000-07-05 Method for assembling at least two component metal elements for producing a structure
KR1020027000113A KR20020043545A (en) 1999-07-05 2000-07-05 Method for assembling at least two component metal elements for producing a structure
US10/019,289 US6857812B1 (en) 1999-07-05 2000-07-05 Process for assembling at least two constituent metal parts in order to create a structure
AU59564/00A AU5956400A (en) 1999-07-05 2000-07-05 Method for assembling at least two component metal elements for producing a structure
PCT/BE2000/000080 WO2001002110A1 (en) 1999-07-05 2000-07-05 Method for assembling at least two component metal elements for producing a structure
EP00945472A EP1192016B1 (en) 1999-07-05 2000-07-05 Method for assembling at least two component metal elements for producing a structure

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Application Number Priority Date Filing Date Title
EP99202194A EP1066894A1 (en) 1999-07-05 1999-07-05 Method of assembling at least two metallic elements for creating a metallic structure

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EP00945472A Expired - Lifetime EP1192016B1 (en) 1999-07-05 2000-07-05 Method for assembling at least two component metal elements for producing a structure

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EP (2) EP1066894A1 (en)
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AT (1) ATE233139T1 (en)
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DE102006029180A1 (en) * 2006-06-24 2007-12-27 Bayerische Motoren Werke Ag Production of a sheet metal part used in the production of doors and tailgates for vehicles comprises injecting an adhesive into the flange fold after flanging the ends of the flange fold
JP5927874B2 (en) * 2011-01-31 2016-06-01 株式会社リコー Sheet material punching device
WO2017183358A1 (en) * 2016-04-20 2017-10-26 株式会社デンソー Heat exchanger and manufacturing method thereof

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DE60001502D1 (en) 2003-04-03
WO2001002110A1 (en) 2001-01-11
AU5956400A (en) 2001-01-22
BR0012356A (en) 2002-03-26
CA2373908A1 (en) 2001-01-11
US6857812B1 (en) 2005-02-22
EP1192016B1 (en) 2003-02-26
DE60001502T2 (en) 2003-12-11
EP1192016A1 (en) 2002-04-03
KR20020043545A (en) 2002-06-10
ATE233139T1 (en) 2003-03-15

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