EP0341168A1 - Outillage pour mise en forme de matériaux métalliques en feuille et procédé correspondant - Google Patents

Outillage pour mise en forme de matériaux métalliques en feuille et procédé correspondant Download PDF

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Publication number
EP0341168A1
EP0341168A1 EP89420164A EP89420164A EP0341168A1 EP 0341168 A1 EP0341168 A1 EP 0341168A1 EP 89420164 A EP89420164 A EP 89420164A EP 89420164 A EP89420164 A EP 89420164A EP 0341168 A1 EP0341168 A1 EP 0341168A1
Authority
EP
European Patent Office
Prior art keywords
sheet
rev
mold
forming
core
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.)
Withdrawn
Application number
EP89420164A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jean-Paul Biboud
Jean-Mary Wattier
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.)
Constellium Issoire SAS
Original Assignee
Cegedur Pechiney Rhenalu SA
Pechiney Rhenalu SAS
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 Cegedur Pechiney Rhenalu SA, Pechiney Rhenalu SAS filed Critical Cegedur Pechiney Rhenalu SA
Publication of EP0341168A1 publication Critical patent/EP0341168A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • B21D26/053—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 characterised by the material of the blanks
    • B21D26/055—Blanks having super-plastic properties

Definitions

  • the invention relates to a tool for shaping metallic materials in the form of sheets, particularly for obtaining complex shapes, not straight, or having re-entrant or undercut angles.
  • This tool is particularly suitable for shaping superplastic materials.
  • the shaping of sheet materials is essentially done by folding, stamping, bending, rolling, flow forming, etc. -
  • these methods are limited to parts of simple and convex shapes; it is in particular difficult to obtain shapes with ribs with closed contours or more generally having undercut parts.
  • tools must be provided in several parts, which can be dismantled and extracted from these undercut parts.
  • the invention proposes to solve this difficulty.
  • the tool according to the invention is characterized in that it comprises at least an undercut part which we will designate by "core”, made of a material soluble in a determined liquid, preferably water or an essentially medium aqueous. This part is associated with the rest of the tooling, produced conventionally, to constitute the mold, template, shape, etc. in or on which the metal sheet is deformed.
  • the core is preferably made of compressed sea salt, which may contain a greater or lesser proportion of an insoluble granular additive such as sand, mica, talc, etc.
  • an insoluble granular additive such as sand, mica, talc, etc.
  • any soluble material can be used, conformable to the desired shape and having sufficient resistance to mechanical and / or thermal stresses undergone during forming.
  • the soluble core can be mechanically reinforced by a flexible internal reinforcement, continuous or divided, such as a wire - (or wire elements).
  • superplastic forming can be combined with local or generalized diffusion welding (SPF-DB) to obtain the final product.
  • SPF-DB local or generalized diffusion welding
  • Demoulding is generally done by extraction of the formed part, containing the nuclei, which is then immersed in the appropriate solvent medium in order to remove the soluble nuclei.
  • the complexity of the formed part and the mold does not allow immediate separation of these 2 elements after forming, it is preferable to provide openings or channels in the thickness of the mold and / or openings in the part in line with the cores soluble.
  • the release is then done by complete immersion of the mold-part assembly in the soluble medium used. If the forming is carried out hot, under the temperature conditions as they correspond to the dissolution, the solvent medium can also serve, where appropriate, as metallurgical quenching medium, either by immersion of the part, or by immersion of the whole part + mold.
  • This core is embedded on 5 mm in the forming tool holder plate 3.
  • All of the tools namely the tool holder 3 secured to a piston 4, the core 2 and the blank clamps 5, are brought to a temperature of 516 ° C + or - 2 ° C in a regulated oven (not shown).
  • the blank 1 is introduced into the tooling and the temperature of the tooling and the blank is stabilized at 516 ° C.
  • the upper blank holder 5a is then clamped against the lower blank holder 5b by trapping the periphery of the blank 1.
  • the oven is put into the air and after opening the blanks, the part, that is to say the formed sheet, is evacuated upwards with the salt core.
  • the core is then dissolved in water by immersion of the part.
  • a blank of the same nature and of the same dimension as that of EXAMPLE 1 was formed in a similar manner to obtain a part shown in FIG. 5, the soluble core having the shape of a parallelepiped bar provided with cylindrical support feet 6.
  • the only essential differences with Example 1 are, as is known, the surface preparation of the sheet before testing eliminating the layers of surface oxide, placing the enclosure under vacuum (5a, 5b) before forming and applying pressure in the enclosure 5a, so as to apply a differential pressure substantially similar to that of FIG . 4. This results in a junction 7 by solid state diffusion welding of the blank 1 between the support legs 6 at the end of the cycle.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Press Drives And Press Lines (AREA)
EP89420164A 1988-05-03 1989-05-02 Outillage pour mise en forme de matériaux métalliques en feuille et procédé correspondant Withdrawn EP0341168A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8806430 1988-05-03
FR8806430A FR2630937B1 (en)van) 1988-05-03 1988-05-03

Publications (1)

Publication Number Publication Date
EP0341168A1 true EP0341168A1 (fr) 1989-11-08

Family

ID=9366263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89420164A Withdrawn EP0341168A1 (fr) 1988-05-03 1989-05-02 Outillage pour mise en forme de matériaux métalliques en feuille et procédé correspondant

Country Status (2)

Country Link
EP (1) EP0341168A1 (en)van)
FR (1) FR2630937B1 (en)van)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2306996C2 (ru) * 2005-10-24 2007-09-27 Константин Юрьевич Апатов Способ получения изделий из листовых заготовок в состоянии сверхпластичности

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2544359A1 (de) * 1974-10-03 1976-04-15 Rockwell International Corp Verfahren zum superplastischen verformen von metallen mit gleichzeitiger diffusionsverbindung
DE2916844A1 (de) * 1979-04-26 1980-11-06 Daimler Benz Ag Verfahren zur herstellung von unterdruckbehaeltern und unterdruckbehaelter fuer kraftfahrzeuge
US4263375A (en) * 1978-12-26 1981-04-21 The Boeing Company Superplastically formed titanium structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2544359A1 (de) * 1974-10-03 1976-04-15 Rockwell International Corp Verfahren zum superplastischen verformen von metallen mit gleichzeitiger diffusionsverbindung
US4263375A (en) * 1978-12-26 1981-04-21 The Boeing Company Superplastically formed titanium structure
DE2916844A1 (de) * 1979-04-26 1980-11-06 Daimler Benz Ag Verfahren zur herstellung von unterdruckbehaeltern und unterdruckbehaelter fuer kraftfahrzeuge

Also Published As

Publication number Publication date
FR2630937A1 (en)van) 1989-11-10
FR2630937B1 (en)van) 1991-08-16

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