EP0657232A1 - Neue Punktverbindung von Blechen durch Kaltfliessen und Werkzeuge zur Herstellung dieser Verbindung - Google Patents

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

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Publication number
EP0657232A1
EP0657232A1 EP93402964A EP93402964A EP0657232A1 EP 0657232 A1 EP0657232 A1 EP 0657232A1 EP 93402964 A EP93402964 A EP 93402964A EP 93402964 A EP93402964 A EP 93402964A EP 0657232 A1 EP0657232 A1 EP 0657232A1
Authority
EP
European Patent Office
Prior art keywords
cavity
punch
tools
producing
shells
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.)
Granted
Application number
EP93402964A
Other languages
English (en)
French (fr)
Other versions
EP0657232B1 (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 DE69319601T priority patent/DE69319601T2/de
Priority to ES93402964T priority patent/ES2121969T3/es
Priority to EP93402964A priority patent/EP0657232B1/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 the production of an assembly point for sheets, more particularly thick aluminum sheets by cold creep.
  • the invention relates to the assembly by cold creep which consists in superimposing at least two sheets, keeping them applied one against the other by a blank holder, forming a stamping using a punch against a matrix in order to form in a first sheet a cavity whose lateral walls have, in the vicinity of the bottom, an enlargement, and in the second sheet a cavity of corresponding shape, conforming by its external surface to the shape of the cavity of the first sheet .
  • the thickness of the second sheet in line with the side wall of the cavity is reduced due to the stretch produced by the insertion of the punch, this generates a slight weakness of the point of assembly especially sensitive 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 one simultaneously practices in at least two superposed sheets using a punch and a two stamped matrix so as to form in each sheet from on 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 that the projection of the first sheet has a flare housed in said widening, 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 towards the free edge of that -this.
  • the beads are four in number and regularly spaced.
  • the invention also relates to tools for producing the new assembly point as defined above and of the type comprising a punch with a blank holder, a matrix comprising an anvil against which mobile shells are applied elastically on a surface guide and limited in their movement by a stop, said tools being characterized in that the punch has grooves.
  • the punch can also have at its free end a cylindrical part connected to the small base of a truncated cone.
  • the grooves are regularly angularly offset.
  • the free ends of the shells are rounded.
  • the free ends of the shells are rounded so that the free edge of said shells situated on the side of the latter cooperating with the anvil is at a distance from the guide surface greater than the distance separating the edge free of the shells adjacent to the external lateral wall thereof.
  • FIG. 1 there is shown a set of tools for producing 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 support 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 die 10 which comprises four shells 11 which rest by their underside on a guide surface 12 of the tool 13.
  • the guide surface 12 and the underside of the 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 11 abut.
  • a cage 16 which constitutes a stop limiting the sliding of the shells 11 and which has holes 17 for guiding fingers 18 integral with the shells 11.
  • the shells 11 have a groove 20 in which is housed a tension spring 21 in the form of a closed ring.
  • References 23 and 24 denote two sheets, for example, aluminum sheets.
  • the free end of the shells 11 is rounded, which has the advantage, when the assembly point is being formed, of avoiding when the shells deviate that the sheet 24 is marked. Indeed, thanks to the rounded ends, the shells when they deviate only bear on the sheet 24 at one point and no projecting part is in contact with said sheet.
  • the rounding is carried out so that the free edge of the shells 11 situated on the side of the internal lateral edge cooperating with the lateral surface of the anvil 14 is located at a distance from the guide surface 12 greater than that separating said guide surface from the free edge of each shell 11 located on the side of the external lateral surface thereof.
  • the 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 assembly point.
  • cylindrical cavities 26 and 27 are formed simultaneously in the sheets 23 and 24 on one side and on the other side of the projections 33 and 34 respectively.
  • said shells 11 which form the matrix 10 are held by the elastic ring 21, at the time of stamping, said shells move apart to abut against the cage 16 so that it forms by creep, in the vicinity from the bottom 30 of the cavity 27, an enlargement 31, while in the projection 33 of the sheet 23 a flare 32 is formed by creep so that an internal connection is thus made between the sheets 26 and 27.
  • the point of assembly then being released from the punch and the die. It is thus possible to assemble, by producing a series of regularly spaced assembly points, two sheets and even three.
  • the grooves 9 of the punch 8 form in the cavity 26 four beads 35 which extend parallel to each other from the bottom of the cavity 26 towards the free edge thereof.
  • Figure 4 shows in section an assembly point made with a conventional punch and we have shown in this figure the same references as those used to designate different corresponding parts of the assembly point 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 makes it possible, at the right of these beads, to increase the thickness "L" and thus to strengthen the assembly point.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Stackable Containers (AREA)
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.
DE69319601T DE69319601T2 (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.
EP93402964A EP0657232B1 (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 true EP0657232A1 (de) 1995-06-14
EP0657232B1 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 (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

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4757609A (en) * 1980-09-08 1988-07-19 Btm Corporation Apparatus for joining sheet material

Patent Citations (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

Also Published As

Publication number Publication date
ES2121969T3 (es) 1998-12-16
DE69319601T2 (de) 1999-05-20
DE69319601D1 (de) 1998-08-13
EP0657232B1 (de) 1998-07-08
FR2692181B1 (fr) 1994-09-02
FR2692181A1 (fr) 1993-12-17

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