EP0549955B1 - Procédé du type à lit fluidisé pour former de la tôle - Google Patents

Procédé du type à lit fluidisé pour former de la tôle Download PDF

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Publication number
EP0549955B1
EP0549955B1 EP92121405A EP92121405A EP0549955B1 EP 0549955 B1 EP0549955 B1 EP 0549955B1 EP 92121405 A EP92121405 A EP 92121405A EP 92121405 A EP92121405 A EP 92121405A EP 0549955 B1 EP0549955 B1 EP 0549955B1
Authority
EP
European Patent Office
Prior art keywords
sheet
punch
chamber
fluid
delivered
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
EP92121405A
Other languages
German (de)
English (en)
Other versions
EP0549955A1 (fr
Inventor
Mario Da Re
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 EP0549955A1 publication Critical patent/EP0549955A1/fr
Application granted granted Critical
Publication of EP0549955B1 publication Critical patent/EP0549955B1/fr
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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/205—Hydro-mechanical deep-drawing

Definitions

  • the invention relates to a method of the fluidised bed type for the shaping of sheet metal according to the preamble of claim 1, as for example known from JP-A-59056926.
  • a method of this type substantially comprises a first stage in which a blank holder is brought into contact with the sheet supported on a forming die provided with a cavity, a second stage in which a pressurised fluid is delivered to the aforesaid cavity beneath the sheet by means of a hydraulic circuit and finally a third stage during which a punch is displaced towards the sheet in order to deform it plastically. Deformation of the sheet takes place in this third stage due to the combined action of the pressures which are generated by the punch on the upper surface of the sheet and by the pressure generated by the aforesaid fluid which acts on the undersurface of the said sheet.
  • a method of this type has the disadvantage that relatively complex forms cannot be pressed in a single forming operation, or that they require a plurality of successive shaping operations carried out using different presses and dies.
  • the object of this invention is to provide a method of the fluidised bed type for the shaping of sheet metal which does not have the disadvantage which has been described and is therefore capable of carrying out extensive shaping of complex shapes in a single shaping operation.
  • a method of the fluidised bed type for the shaping of sheet metal substantially comprising a first stage in which a blank holder is brought into contact with the sheet supported on a shaping die provided with a cavity, a second stage in which a pressurised fluid is delivered to the said cavity below the said sheet by means of a first hydraulic circuit and a third stage during which a punch is displaced towards the said sheet to deform it elastically through the combined effect of the pressures generated by the said punch on the upper surface of the sheet and the pressures generated on the underside of the sheet by the said fluid, characterised in that a second pressurised fluid delivered by a second hydraulic circuit is caused to act on at least one portion of the upper surface of the said sheet so as to balance out the pressures acting against the underside of the said portion while the said punch is moved towards the sheet in the course of the said third stage.
  • Figures 1, 2 and 3 show successive configurations of the punch and the sheet in the course of the shaping of the said sheet.
  • the method according to the invention substantially comprises a first stage in which a blank holder 1 is brought into contact with the sheet 2 supported on a forming die 3, which is provided with a cavity 4 of suitable shape. During this first stage of the method the blank holder exerts a predetermined pressure against the edges 5 of the sheet so as substantially to provide a hydraulic seal for cavity 4.
  • a pressurised fluid is delivered to cavity 4 below undersurface 5 of the sheet through a first hydraulic circuit, which is not illustrated.
  • a punch 7 of suitable shape is moved towards cavity 4 in order to deform sheet 2, as is clearly shown in Figure 1.
  • the sheet is plastically deformed through the combined action of the pressures which punch 7 exerts against the upper surface 8 of the sheet and the pressures which are generated against the underside 6 of the said sheet by the fluid filling cavity 4. This is obviously held at a predetermined pressure within cavity 4 through suitable means which are not shown.
  • a second pressurised fluid which is delivered by a second hydraulic circuit (not shown) is caused to act against the upper surface 9 of at least a portion 10 of sheet 2 in order to balance out the pressures acting on the undersurface 11 of portion 10.
  • the second hydraulic fluid is delivered substantially to a chamber 12, which is defined partly by the lower surface of the punch itself, partly by the surface of blank holder 1 and the upper surface 9 of portion 10 of the sheet.
  • the second pressurised fluid is delivered to chamber 12 when punch 7 has reached a predetermined point in its stroke and has already begun to deform sheet 2.
  • the hydraulic fluid can be fed to a chamber 12 via a conduit 13 provided in blank holder 1.
  • This conduit includes a stop valve 14 which can be switched from a first position in which the conduit is in communication with a source (not illustrated) of the second pressurized fluid and a second position in which this allows the said fluid to be discharged, thus maintaining a predetermined fluid pressure within the chamber.
  • valve 14 is provided with means to effect a desired resistance to the passage of fluid, so as to maintain the aforesaid predetermined pressure within chamber 12 while punch 7 completes its stroke to deform sheet 2 plastically.
  • additional cavity 15 of small size, in e.g. punch 7, as shown in the figures.
  • additional chamber 15 is still in communication with conduit 13 and excess pressure in the second hydraulic fluid resulting from closure of conduit 13 by punch 7 is thus avoided.
  • the small volume of additional chamber 15 does not have any effect on the geometry and shape characteristics of the semi-finished product obtained by forming the sheet.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Forging (AREA)

Claims (6)

  1. Procédé du type à lit fluidisé pour former une feuille de tôle, comprenant pratiquement une première étape dans laquelle un serre-flan (1) est amené en contact avec la tôle (2) supportée sur une matrice de formage (3) ayant une cavité (4), une deuxième étape dans laquelle un fluide sous pression est amené dans ladite cavité (4) en dessous de la tôle au moyen d'un premier circuit hydraulique et une troisième étape pendant laquelle un poinçon (7) est déplacé en direction de ladite tôle pour la déformer plastiquement par l'action combinée des pressions produites par ledit poinçon sur la surface supérieure (8) de la tôle et des pressions produites par ledit fluide sur le côté inférieur (6) de la tôle, caractérisé en ce qu'un deuxième fluide sous pression, fourni par un deuxième circuit hydraulique, est amené à agir sur la surface supérieure (9) d'au moins une portion (10) de ladite tôle (2) de façon à contrebalancer les pressions agissant sur le côté inférieur (11) de ladite portion pendant que ledit poinçon (7) est déplacé pour déformer ladite tôle au cours de ladite troisième étape.
  2. Procédé selon la revendication 1, caractérisé en ce que ledit deuxième fluide hydraulique est amené dans une chambre (12) délimitée en partie par les surfaces dudit poinçon (7), ledit serre-flan (1) et la surface supérieure (9) de ladite portion de tôle (10).
  3. Procédé selon l'une ou l'autre des revendications 1 et 2, caractérisé en ce que ledit deuxième fluide sous pression est amené dans ladite chambre (12) lorsque ledit poinçon (7) a atteint un point prédéterminé dans sa course et est amené en contact avec ladite tôle (2), et est ensuite progressivement déchargé de ladite chambre pendant la partie restante de la course du poinçon en maintenant une pression prédéterminée dans la chambre pendant que son volume diminue.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit deuxième fluide hydraulique est amené dans ladite chambre (12) par l'intermédiaire d'un conduit (13) prévu dans ledit serre-flan (1), dont le trajet comporte une vanne d'arrêt (14) qui peut être commutée d'une première position dans laquelle le conduit est en communication avec une source dudit deuxième fluide sous pression et une deuxième position dans laquelle elle permet audit deuxième fluide sous pression d'être déchargé tout en maintenant une pression de fluide prédéterminée dans ladite chambre.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un volume résiduel, qui n'est pas nul, est maintenu dans ladite chambre lorsque le poinçon (7) atteint l'extrémité de sa course.
  6. Procédé selon la revendication 5, caractérisé en ce que ledit volume résiduel est contenu à l'intérieur d'une chambre additionnelle (15) en communication avec ladite chambre (12), procurée au moyen d'une cavité ménagée dans une partie dudit poinçon (7) qui se trouve proche de la sortie dudit conduit (13) à la fin de la course de formage.
EP92121405A 1991-12-20 1992-12-16 Procédé du type à lit fluidisé pour former de la tôle Expired - Lifetime EP0549955B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO911012 1991-12-20
ITTO911012A IT1250551B (it) 1991-12-20 1991-12-20 Procedimento per l'imbutitura di lamiera metallica del tipo a letto fluido.

Publications (2)

Publication Number Publication Date
EP0549955A1 EP0549955A1 (fr) 1993-07-07
EP0549955B1 true EP0549955B1 (fr) 1995-11-08

Family

ID=11409816

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92121405A Expired - Lifetime EP0549955B1 (fr) 1991-12-20 1992-12-16 Procédé du type à lit fluidisé pour former de la tôle

Country Status (6)

Country Link
EP (1) EP0549955B1 (fr)
JP (1) JPH05245546A (fr)
BR (1) BR9204920A (fr)
DE (1) DE69205959T2 (fr)
IT (1) IT1250551B (fr)
PL (1) PL169841B1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2103656B1 (es) * 1994-10-06 1998-05-01 Idem Construcciones Vascas S L Sistema de embuticion por agua inyectada para la conformacion de piezas.
DE19827614B4 (de) * 1998-06-20 2005-08-25 Steinhart, Paul, Dipl.-Ing. Verfahren und Vorrichtung zur Herstellung von Tiefziehteilen
KR20020076943A (ko) * 2001-03-31 2002-10-11 현대자동차주식회사 듀얼 하이드로포밍 장치
US8534106B2 (en) * 2009-10-19 2013-09-17 Ford Global Technologies, Llc Hydromechanical drawing process and machine
PL235400B1 (pl) * 2018-01-29 2020-07-13 Politechnika Warszawska Sposób hydromechanicznego kształtowania profili cienkościennych i matryca do hydromechanicznego kształtowania profili cienkościennych
CN112893595B (zh) * 2021-01-14 2023-06-16 山东钢铁集团日照有限公司 一种弯曲轴线管件低压成形专用模具

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE915327C (de) * 1951-09-23 1954-07-19 Heinrich Ewald Kranenberg Vorrichtung zur Herstellung von Hohlkoerpern aus Blech unter hydraulischem Druck
DE951807C (de) * 1955-04-01 1956-11-08 Heinrich Ewald Kranenberg Vorrichtung zur Herstellung von Hohlkoerpern aus Blech unter hydraulischem Druck
DE92253T1 (de) * 1982-04-20 1984-03-01 Amino Iron Works Co., Ltd., Fujunomiya, Shizuoka Verfahren zum formen von blech mittels hydraulischen gegendrucks.

Also Published As

Publication number Publication date
EP0549955A1 (fr) 1993-07-07
JPH05245546A (ja) 1993-09-24
ITTO911012A0 (it) 1991-12-20
PL297058A1 (en) 1993-09-06
DE69205959T2 (de) 1996-07-11
PL169841B1 (pl) 1996-09-30
BR9204920A (pt) 1994-06-28
IT1250551B (it) 1995-04-20
ITTO911012A1 (it) 1993-06-21
DE69205959D1 (de) 1995-12-14

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