EP0657232B1 - Punktverbindung von Blechen durch Kaltfliessen und Werkzeuge zur Herstellung dieser Verbindung - Google Patents

Punktverbindung von Blechen durch Kaltfliessen und Werkzeuge zur Herstellung dieser Verbindung Download PDF

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Publication number
EP0657232B1
EP0657232B1 EP93402964A EP93402964A EP0657232B1 EP 0657232 B1 EP0657232 B1 EP 0657232B1 EP 93402964 A EP93402964 A EP 93402964A EP 93402964 A EP93402964 A EP 93402964A EP 0657232 B1 EP0657232 B1 EP 0657232B1
Authority
EP
European Patent Office
Prior art keywords
punch
tools
shells
sheet
cavity
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
Application number
EP93402964A
Other languages
English (en)
French (fr)
Other versions
EP0657232A1 (de
Inventor
Jean-Claude Chabod
Jean-Claude Faivre
Letterio Sturniola
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.)
HOMAX AG
Original Assignee
HOMAX AG
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
Priority to FR929207191A priority Critical patent/FR2692181B1/fr
Application filed by HOMAX AG filed Critical HOMAX AG
Priority to EP93402964A priority patent/EP0657232B1/de
Priority to ES93402964T priority patent/ES2121969T3/es
Priority to DE69319601T priority patent/DE69319601T2/de
Publication of EP0657232A1 publication Critical patent/EP0657232A1/de
Application granted granted Critical
Publication of EP0657232B1 publication Critical patent/EP0657232B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21D39/03—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 plate assembly point according to the preamble of claim 1, more particularly thick aluminum sheets by cold flow and a tool for the realization of such an assembly point according to the preamble of claim 3.
  • the invention relates to creep assembly cold which consists of superimposing at least two sheets, keep them applied against each other by a greenhouse, to form a stamping using a punch against a matrix in order to form, in a first sheet, a cavity whose side walls have, in the vicinity from the bottom, an enlargement, and in the second sheet a cavity of corresponding shape matching, by its external surface, the shape of the cavity of the first sheet.
  • GB-A-2 189 175 describes an assembly point and a set to produce such an assembly point according to the preambles of claims 1 and 3.
  • the thickness of the second sheet, to the right of the side wall of the cavity is reduced due to the stretch produced by the depression of the punch, this generates a slight weakness of the especially sensitive assembly point when using relatively thin aluminum sheets.
  • One of the aims of the present invention is to remedy this drawback.
  • the assembly point is of the type in which we practice simultaneously in at least two sheets superimposed using a punch and a die two stampings so as to form, in each of the 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 said second sheet having, in the vicinity of its bottom, an enlargement, while the projection of the first sheet has a flare housed in said enlargement, said point being characterized in that the cavity of the first sheet has a series of beads extending substantially parallel from the bottom of said cavity to the free edge of this one.
  • the beads are one in number of four and evenly spaced.
  • the tool according to the invention for the realization of the assembly point as above defined and of the type comprising a punch with a blank holder, a matrix comprising an anvil against which are elastically applied movable shells on a surface guide and limited in their movement by a stop, said tools being characterized in that the punch has grooves extending parallel to the longitudinal axis of said punch and opening at its free end.
  • this affects a frustoconical shape.
  • the punch can also have at its end free a cylindrical part connected to the small base of a truncated cone.
  • the grooves can be regularly angularly offset.
  • a another feature of the invention is to remedy to this disadvantage.
  • the free ends of the shells can be rounded.
  • the ends free shells are rounded so that the free edge of said shells located on the side thereof cooperating with the anvil either at a distance from the surface guide greater than the distance from the edge free from the shells adjacent to the outer side wall of these.
  • FIG. 1 there is shown a set of tools for the realization of an assembly point, according to the invention.
  • These tools include a tool 1 provided with a shank 2 to allow its attachment to a mandrel of a machine.
  • Tool 1 has a shoulder 3 intended to receive a support stop 4 for a blank holder 5.
  • the blank holder 5 is constituted by a block of rubber or plastic material shaped so as to have a circular opening 6 whose edges cooperate, on the one hand, with the bearing stop 4 and, on the other hand, with a shoulder 7 of the tool.
  • the tool 1 is terminated by the active part of the punch 8 which has four grooves 9 which extend parallel to the longitudinal axis of the tool and which are regularly offset by 90 ° between them.
  • the active part of the punch 8 has, on the side of the free end, a cylindrical part 8 a connected to the small base of a truncated cone 8 b , the large base of which is adjacent to the shoulder 7.
  • the bottom of the grooves 9 is rounded and these are open at the free end of the punch 8.
  • the punch 8 is intended to cooperate with a matrix 10 which includes four shells 11 which rest by their underside on a guide surface 12 of the tool 13.
  • the guide surface 12 and the underside shells 10 are perfectly machined so that the shells 10 can slide freely on said surface 12.
  • the tool 13 includes an anvil 14 against the lateral surface of which the shells abut 11.
  • a cage 16 which constitutes a stop limiting the sliding of the shells 11 and which has holes 17 for guiding fingers 18 secured to the shells 11.
  • the shells 11 have a groove 20 in which is housed a tension spring 21 in the form of a ring closed.
  • References 23 and 24 designate two sheets, for example, aluminum sheets.
  • the free end of the shells 11 is rounded which has the advantage, when formation of the assembly point, avoid when the shells move apart that the sheet 24 is marked. Indeed, thanks to the rounded ends, the shells when they deviate only on the sheet 24 on one point and no projecting part is in contact with said sheet.
  • the rounding is carried out so that the free edge shells 11 located on the side of the internal lateral edge cooperating with the lateral surface of the anvil 14 either located at a distance from the upper guide surface 12 to that separating said guide surface from the free edge of each shell 11 located on the side of the lateral surface external of it.
  • Tool 1 is lowered so that the blank holder 5 blocks said sheets, the punch 8 deforming by cold stamping said sheets to form the point assembly.
  • the grooves 9 of the punch 8 forms in the cavity 26 four beads 35 which extend parallel to each other from the bottom from the cavity 26 towards the free edge of the latter.
  • Figure 4 shows a section of an assembly point made with a classic punch and we carried over in this figure the same references as those used to designate different corresponding parts of the point assembly of figure 5, but assigned the letter "at”.
  • the thickness "L" of the sheet 23 a in the part situated above the flaring 32 a and comprised between the projection 33 a and the cavity 26 a is smaller than for the other parts.
  • the formation of the beads 35 allows the right of these beads to increase the thickness "L” and thus strengthen the assembly point.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (8)

  1. Punktverbindung von Blechen durch Kaltfließverformen, wobei man in zumindest zwei übereinanderliegenden Blechen (23 und 24) gleichzeitig mit Hilfe eines Stempels und einer Matrize zwei Tiefungen so herstellt, daß in jedem der Bleche von einer Seite her ein Hohlraum (26, 27) und auf der anderen Seite ein Vorsprung (33, 34) gebildet werden, wobei der Vorsprung (33) des ersten Bleches (23) in den Hohlraum (27) des zweiten Bleches (24) eingefügt ist, der genannte Hohlraum (27) des zweiten Bleches (24) in der Nähe seines Bodens (30) eine Erweiterung (31) besitzt und der Vorsprung (33) des ersten Bleches eine Ausbauchung (32) aufweist, die in der genannten Erweiterung (31) angeordnet ist, dadurch gekennzeichnet, daß der Hohlraum (26) des ersten Bleches (23) eine Reihe von Wülsten (35) aufweist, die sich im wesentlichen parallel vom Boden des genannten Hohlraumes gegen den freien Rand desselben erstrecken.
  2. Punktverbindung nach Anspruch 1, dadurch gekennzeichnet, daß die Anzahl der Wülste (35) vier beträgt und sie in regelmäßigen Abständen voneinander angeordnet sind.
  3. Werkzeuge zum Herstellen der Punktverbindung nach Anspruch 1, mit einem Stempel (8) mit einem Niederhalter (5), mit einer Matrize (10), die einen Amboß (14) aufweist, gegen den Schalen (11) federnd angelegt sind, die auf einer Führungsfläche (12) beweglich und in ihrer Verschiebebewegung durch einen Anschlag (16) begrenzt sind, dadurch gekennzeichnet, daß der Stempel (8) Rillen (9) aufweist, die sich parallel zur Längsachse des genannten Stempels (8) erstrecken und an dessen freiem Ende offen sind.
  4. Werkzeuge nach Anspruch 3, dadurch gekennzeichnet, daß der Stempel (8) eine kegelstumpfförmige Form besitzt.
  5. Werkzeuge nach Anspruch 3, dadurch gekennzeichnet, daß der Stempel (8) in einem zylindrischen Teil (8a) endigt, der mit der kleinen Basis eines Kegelstumpfes (8b) verbunden ist.
  6. Werkzeuge nach Anspruch 3, dadurch gekennzeichnet, daß die Rillen (9) in regelmäßigen Winkelabständen zueinander versetzt sind.
  7. Werkzeuge nach Anspruch 3, dadurch gekennzeichnet, daß die freien Enden der Schalen (11) abgerundet sind.
  8. Werkzeuge nach Anspruch 7, dadurch gekennzeichnet, daß die freien Enden der Schalen (11) so abgerundet sind, daß der freie Rand der genannten Schalen (11) auf deren mit dem Amboß (14) zusammenwirkender Seite von der Führungsfläche einen Abstand hat, der größer ist als der betreffende Abstand an dem der seitlichen Außenwand benachbarten freien Rand der Schalen (11).
EP93402964A 1992-06-15 1993-12-08 Punktverbindung von Blechen durch Kaltfliessen und Werkzeuge zur Herstellung dieser Verbindung Expired - Lifetime EP0657232B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR929207191A FR2692181B1 (fr) 1992-06-15 1992-06-15 Nouveau point d'assemblage de tôles par fluage à froid et outils pour la réalisation dudit point d'assemblage.
EP93402964A EP0657232B1 (de) 1992-06-15 1993-12-08 Punktverbindung von Blechen durch Kaltfliessen und Werkzeuge zur Herstellung dieser Verbindung
ES93402964T ES2121969T3 (es) 1992-06-15 1993-12-08 Conexion mediante punto de union para chapas por extrusion en frio y herramientas para producir esta conexion.
DE69319601T DE69319601T2 (de) 1992-06-15 1993-12-08 Punktverbindung von Blechen durch Kaltfliessen und Werkzeuge zur Herstellung dieser Verbindung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR929207191A FR2692181B1 (fr) 1992-06-15 1992-06-15 Nouveau point d'assemblage de tôles par fluage à froid et outils pour la réalisation dudit point d'assemblage.
EP93402964A EP0657232B1 (de) 1992-06-15 1993-12-08 Punktverbindung von Blechen durch Kaltfliessen und Werkzeuge zur Herstellung dieser Verbindung

Publications (2)

Publication Number Publication Date
EP0657232A1 EP0657232A1 (de) 1995-06-14
EP0657232B1 true EP0657232B1 (de) 1998-07-08

Family

ID=26134755

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93402964A Expired - Lifetime EP0657232B1 (de) 1992-06-15 1993-12-08 Punktverbindung von Blechen durch Kaltfliessen und Werkzeuge zur Herstellung dieser Verbindung

Country Status (4)

Country Link
EP (1) EP0657232B1 (de)
DE (1) DE69319601T2 (de)
ES (1) ES2121969T3 (de)
FR (1) FR2692181B1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2189175A (en) * 1986-04-17 1987-10-21 Btm Corp Apparatus for joining sheet material

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3771216A (en) * 1971-10-27 1973-11-13 Johnson Die & Eng Co Method and tooling for extruding a closed end rivet
DE3131301A1 (de) * 1981-08-07 1983-02-24 Siemens AG, 1000 Berlin und 8000 München "vorrichtung zum verbinden mindestens zweier duennwandiger werkstuecke durch ein scher-quetsch-verfahren"
DE3923182A1 (de) * 1989-07-13 1991-01-24 Fraunhofer Ges Forschung Vorrichtung zum verbinden von plattenfoermigen bauteilen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2189175A (en) * 1986-04-17 1987-10-21 Btm Corp Apparatus for joining sheet material

Also Published As

Publication number Publication date
ES2121969T3 (es) 1998-12-16
FR2692181B1 (fr) 1994-09-02
DE69319601D1 (de) 1998-08-13
DE69319601T2 (de) 1999-05-20
EP0657232A1 (de) 1995-06-14
FR2692181A1 (fr) 1993-12-17

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