EP0549955B1 - Method of the fluidised bed type for the shaping of sheet metal - Google Patents

Method of the fluidised bed type for the shaping of sheet metal Download PDF

Info

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)
French (fr)
Other versions
EP0549955A1 (en
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
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 Fiat Auto SpA filed Critical Fiat Auto SpA
Publication of EP0549955A1 publication Critical patent/EP0549955A1/en
Application granted granted Critical
Publication of EP0549955B1 publication Critical patent/EP0549955B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
  • Forging (AREA)
EP92121405A 1991-12-20 1992-12-16 Method of the fluidised bed type for the shaping of sheet metal Expired - Lifetime EP0549955B1 (en)

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 (en) 1993-07-07
EP0549955B1 true EP0549955B1 (en) 1995-11-08

Family

ID=11409816

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92121405A Expired - Lifetime EP0549955B1 (en) 1991-12-20 1992-12-16 Method of the fluidised bed type for the shaping of sheet metal

Country Status (6)

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

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

Similar Documents

Publication Publication Date Title
US3208255A (en) Method and apparatus for hydraulic deep-drawing of sheet material
US5016458A (en) Method and device for pressing sheet material with a deformable punch under a ram
US5626048A (en) Method and apparatus for forming cup-shaped members
US6128987A (en) Hydraulic press for forming metal plates
EP0059432A2 (en) Press machine
KR100474018B1 (ko) 하이드로포밍 장치 및 방법
GB2151527A (en) Method of pressing a blank
US4770015A (en) Process and device for press-forming sheet material having a small elongation
AU617566B2 (en) Method and apparatus for embossing the inside surface of a cup-shaped article
EP0549955B1 (en) Method of the fluidised bed type for the shaping of sheet metal
US3286496A (en) Apparatus for hydraulic deep-drawing of sheet metal
US6588244B2 (en) Process for hydroforming sheet metal and device for practicing the same
US5195349A (en) Forming machine and process for forming material therewith
EP0092253B1 (en) Metal sheet forming process with hydraulic counterpressure
US5819573A (en) Hydraulic forming of workpieces from sheet metal
US20020083756A1 (en) Deep-drawing method and deep-drawing die
US1904864A (en) Material working apparatus
JP3581734B2 (ja) 軸方向加圧式絞り成形法
EP0605096A1 (en) Mold for tile
JPS6313626A (ja) リツプスキン類の成形法及び装置
SU1433613A1 (ru) Штамп дл гор чего гидромеханического прессовани
EP1043091B1 (en) Method of moulding metal using high fluid pressure
JPH0225224A (ja) 対向液圧成形装置
JPH0227933Y2 (pl)
SU1171170A1 (ru) Устройство дл прессовани заготовок из малопластичных материалов

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB IT SE

17P Request for examination filed

Effective date: 19931203

17Q First examination report despatched

Effective date: 19940812

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES FR GB IT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY

Effective date: 19951108

ITF It: translation for a ep patent filed

Owner name: STUDIO TORTA SOCIETA' SEMPLICE

REF Corresponds to:

Ref document number: 69205959

Country of ref document: DE

Date of ref document: 19951214

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19960208

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20041025

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20041028

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20041228

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20051216

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20051216

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060701

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20051216

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060831

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20060831