EP0593950B1 - Procédé de fixation d'un insert tubulaire de renforcement dans une structure métallique tubulaire et dispositif d'utilisation du procédé - Google Patents

Procédé de fixation d'un insert tubulaire de renforcement dans une structure métallique tubulaire et dispositif d'utilisation du procédé Download PDF

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Publication number
EP0593950B1
EP0593950B1 EP93115680A EP93115680A EP0593950B1 EP 0593950 B1 EP0593950 B1 EP 0593950B1 EP 93115680 A EP93115680 A EP 93115680A EP 93115680 A EP93115680 A EP 93115680A EP 0593950 B1 EP0593950 B1 EP 0593950B1
Authority
EP
European Patent Office
Prior art keywords
wall
tubular
punch
insert
tubular structure
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
EP93115680A
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German (de)
English (en)
Other versions
EP0593950A1 (fr
Inventor
Mario Da Re'
Paolo Giuseppe Guidoboni
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.)
Fiat Auto SpA
Original Assignee
Fiat Auto SpA
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Filing date
Publication date
Application filed by Fiat Auto SpA filed Critical Fiat Auto SpA
Publication of EP0593950A1 publication Critical patent/EP0593950A1/fr
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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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/035—Deforming tubular bodies including an additional treatment performed by fluid pressure, e.g. perforating
    • 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
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • B21D39/044—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods perpendicular

Definitions

  • the present invention relates to a process and to an apparatus for fixing a tubular reinforcing insert to a tubular metal structure.
  • EP-A-0 293 101 discloses a method of making a rigid angled joint between a first length of metal tubing and a second length. This method comprises the steps of first applying a rotating piercing tool under pressure to the first tube's wall. The tool thus forms a hole surrounded by an integral bush, which is formed from the displaced tube wall material and has a diameter to closely fit the external diameter of the second tube. The second tube is inserted through the bush into the interior of the first tube and is secured therein by a bolt or screw.
  • the tubular structure may be the chassis of the motor vehicle, the support frame for the engine or a supporting structure in general.
  • a welding technique is used.
  • the reinforcing insert serves as an anchorage for mechanical parts.
  • the reinforcing insert serves as the seat for vibration-damping supports and is subject to traction or axial-compressive stresses and/or shear forces.
  • the object of the present invention is to provide a different system for fixing the reinforcing insert so as to avoid welding and screwing.
  • This technique involves a considerable reduction in the working time compared with normal fixing by welding. Moreover, if the number of reinforcing inserts to be fixed to the main structure is increased, the working time remains constant in that the operation is carried out in a single forming tool. On the contrary, when inserts are fixed by welding, the working time increases proportionally with the number of pieces to be welded.
  • the joint obtained by the process of the invention has greater resistance to shear forces by virtue of the greater resistant surface offered by the collar formed in the wall of the tubular structure.
  • the dimensions of the joint are also more precise than in traditional fixing by welding.
  • a tubular structure is indicated 10 to which a tubular reinforcing insert 12 is to be fixed.
  • Two dies one movable relative to the other, are indicated 14 and 16 and are adapted to clamp the tubular structure 10 between them.
  • the die 14, 16 have respective seats 18, 20 which together form a deformation chamber.
  • the lower die 16 has a recess 22 from the base wall of which projects a cylindrical punch 24 which, in use, extends perpendicular to the axis of the tubular structure 10.
  • the diameter of the punch 24 is substantially equal to the internal diameter of the reinforcing insert 12 so that the latter may be fitted onto the punch 24 without forcing.
  • the diameter of the recess 22 is slightly greater than the outer diameter of the insert 12.
  • the punch 24 has a pointed part which projects beyond the corresponding end of the reinforcing insert 12.
  • the insert 12 has a conical end portion 26 ending with an annular groove 28.
  • the structure 10 is disposed between the two dies 14, 16 and is connected to a hydraulic circuit (not illustrated) which directs high pressure fluid into the tubular structure 10.
  • This forming technique is known per se and is generally termed "hydroforming".
  • the portion of the structure which is located in the deformation chamber 18, 20 expands radially until it is brought into contact with the walls of the seats 18, 20 which form the deformation chamber.
  • the punch 24 opens a hole 30 in the wall 10 ( Figure 3) causing inward deformation or a wall portion 32 which constitutes an annular collar.
  • the reinforcing insert 12 is inserted forcibly into the annular collar 32 ( Figure 4).
  • the pressurised fluid acting in the structure 10 compresses the collar 32 against the outer wall of the insert 12 and clamps the collar 32 against the groove 28 and the end portion 26 of the insert 12.
  • FIGS 5 and 6 illustrate the structure 10 after the fixing of the insert 12 in the manner described above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Claims (8)

  1. Procédé de fixation d'un insert tubulaire de renforcement (12) à une structure métallique tubulaire (10), comprenant la formation d'un trou (30) dans la paroi de la structure tubulaire (10) par déformation vers l'intérieur d'une partie de la paroi afin que la partie déformée de paroi forme un collier annulaire (32), caractérisé en ce qu'il comprend les étapes suivantes :
    - l'emmanchement à force d'une partie d'extrémité (26) de l'insert tubulaire (12) dans le collier (32), et
    - l'introduction d'un liquide à haute pression dans la structure tubulaire (10) afin que le collier soit comprimé contre la partie d'extrémité (26) de l'insert tubulaire (12).
  2. Procédé selon la revendication 1, caractérisé en ce que le trou (30) et le collier (32) sont formés par l'introduction à force d'un poinçon (24) dans la paroi de la structure tubulaire (10).
  3. Procédé selon la revendication 2, caractérisé en ce qu'il comporte en outre l'étape de dilatation radiale d'une partie de la structure tubulaire (10) d'une manière qui correspond au point d'ancrage de l'insert (12) sous l'effet de l'introduction du liquide sous pression dans la structure tubulaire (10), l'introduction du poinçon (24) dans la paroi de la structure tubulaire (10) étant provoquée par la dilatation radiale de la paroi.
  4. Procédé selon la revendication 2 ou la revendication 3, caractérisé en ce que l'insert tubulaire (12) est placé sur le poinçon (24) avant l'étape d'introduction du poinçon (24) dans la paroi de la structure tubulaire (10), le poinçon (24) ayant une extrémité pointue qui dépasse au-delà de l'extrémité de l'insert (12).
  5. Procédé selon la revendication 1, caractérisé en ce que ladite partie d'extrémité (26) de l'insert (12) est conique.
  6. Procédé selon la revendication 1, caractérisé en ce que l'insert tubulaire (12) a une gorge annulaire (28) sur laquelle le collier (32) est fermé pendant sa compression contre la partie (26) d'extrémité de l'insert (12).
  7. Appareil de fixation d'un insert tubulaire (12) de renforcement sur une structure tubulaire métallique (10), dans lequel :
    a) l'appareil comprend deux matrices (14, 16) destinées au serrage de la structure tubulaire (10) entre elles,
    b) l'une des matrices (16) a une cavité (22) dans sa paroi de base, un poinçon (24) étant fixé dans la cavité (22), son extrémité libre dépassant au-delà de la paroi de base, une cavité cylindrique qui peut loger l'insert de renforcement (12) étant délimitée entre le poinçon (24) et la paroi de la cavité (22),
    c) le poinçon (24) comporte une partie pointue à son extrémité libre, la partie pointue convenant à l'ouverture d'un trou (30) dans la paroi de la structure tubulaire (10) et déformant vers l'intérieur la partie de paroi qui est ouverte lorsque le poinçon (24) et la paroi sont déplacés mutuellement, le poinçon (24) ayant une configuration telle que, lors de la poursuite du déplacement relatif du poinçon (24) et de la paroi, le matériau entourant le trou (30) se dilate progressivement en direction radiale dans un collier annulaire, et
    d) l'appareil comprend un dispositif d'introduction d'un liquide à haute pression dans la structure tubulaire (10).
  8. Appareil selon la revendication 7, caractérisé en ce que les matrices (14, 16) délimitent une chambre de déformation (18, 20) dont les dimensions sont plus grandes que celles de la partie correspondante de la structure tubulaire (10) avant l'introduction du liquide sous pression dans sa structure si bien que l'introduction du liquide dans la structure tubulaire provoque une dilatation radiale de la partie de cette structure dans cette chambre (18, 20) et la pénétration du poinçon (24) dans la paroi de la structure (10).
EP93115680A 1992-10-22 1993-09-29 Procédé de fixation d'un insert tubulaire de renforcement dans une structure métallique tubulaire et dispositif d'utilisation du procédé Expired - Lifetime EP0593950B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO920851 1992-10-22
ITTO920851A IT1256977B (it) 1992-10-22 1992-10-22 Procedimento per il fissaggio di un inserto tubolare di rinforzo ad una struttura tubolare metallica ed apparecchiatura per la realizzazione di tale procedimento.

Publications (2)

Publication Number Publication Date
EP0593950A1 EP0593950A1 (fr) 1994-04-27
EP0593950B1 true EP0593950B1 (fr) 1997-02-12

Family

ID=11410798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93115680A Expired - Lifetime EP0593950B1 (fr) 1992-10-22 1993-09-29 Procédé de fixation d'un insert tubulaire de renforcement dans une structure métallique tubulaire et dispositif d'utilisation du procédé

Country Status (4)

Country Link
EP (1) EP0593950B1 (fr)
JP (1) JPH06198358A (fr)
DE (1) DE69308101T2 (fr)
IT (1) IT1256977B (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19530055B4 (de) * 1995-08-16 2004-08-26 Schuler Hydroforming Gmbh & Co. Kg Verfahren zum Herstellen von doppelwandigen Durchbrechungen in Bauteilen nach dem Innenhochdruck-Umformverfahren
DE19714902C2 (de) * 1997-04-10 1999-05-12 Meleghy Hydroforming Gmbh & Co Verfahren und Vorrichtung zum Einbringen von Verbindungselementen in ein Blech
US6134767A (en) * 1997-04-10 2000-10-24 Meleghy Hydroforming Gmbh & Co. Kg Method for embedding connection elements in a wall
EP1105228A2 (fr) * 1998-08-17 2001-06-13 SIEMPELKAMP PRESSEN SYSTEME GmbH & CO. Procede de deformation par haute pression interne d'au moins deux corps creux dotes respectivement d'un orifice, notamment de tuyaux metalliques ou de profiles creux metalliques
SE516610C2 (sv) * 2000-06-29 2002-02-05 Saab Automobile Sätt att framställa ett förstärkt rörformigt profilelement genom hydroformning och ett sådant profilelement
DE10230284B4 (de) * 2002-07-05 2008-10-16 Daimler Ag Verfahren und Vorrichtung zur Befestigung von Bauteilen an umfänglich geschlossensn Hohlprofilen
DE10346906B3 (de) 2003-10-09 2005-05-19 Benteler Automobiltechnik Gmbh Fügen zweier Bauteile während des Warmformvorgangs
JP5130693B2 (ja) * 2006-10-27 2013-01-30 新日鐵住金株式会社 ハイドロフォームを用いた穿孔方法と穿孔装置
DE102007007932B3 (de) * 2007-02-17 2008-12-18 Daimler Ag Verfahren und Vorrichtung zum Verbinden eines Anschlussbauteils mit einem Innenhochdruckumformteil
DE102010041971A1 (de) * 2010-10-05 2012-04-05 Arnold & Shinjo Gmbh & Co. Kg Verfahren und Vorrichtung zum Anbringen von Stanzelementen an Rohren

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3350905A (en) * 1963-12-21 1967-11-07 Agency Ind Science Techn Liquid pressure bulge forming apparatus
FR1532737A (fr) * 1966-07-12 1968-07-12 Western Electric Co Fabrication d'un objet tubulaire présentant des parties de sections droites différentes
GB8710650D0 (en) * 1987-05-06 1987-06-10 Flamefast Technology Ltd Making angled joint

Also Published As

Publication number Publication date
ITTO920851A0 (it) 1992-10-22
DE69308101D1 (de) 1997-03-27
IT1256977B (it) 1995-12-27
EP0593950A1 (fr) 1994-04-27
ITTO920851A1 (it) 1994-04-22
DE69308101T2 (de) 1997-05-28
JPH06198358A (ja) 1994-07-19

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