EP3479919A1 - Procédé de formage à froid pour tôles ou feuilles en métal - Google Patents

Procédé de formage à froid pour tôles ou feuilles en métal Download PDF

Info

Publication number
EP3479919A1
EP3479919A1 EP17199512.9A EP17199512A EP3479919A1 EP 3479919 A1 EP3479919 A1 EP 3479919A1 EP 17199512 A EP17199512 A EP 17199512A EP 3479919 A1 EP3479919 A1 EP 3479919A1
Authority
EP
European Patent Office
Prior art keywords
sheet
metal foil
plastic film
metal
forming
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Withdrawn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
EP17199512.9A
Other languages
German (de)
English (en)
Inventor
Christian Leppin
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.)
Suisse Technology Partners AG
Original Assignee
Suisse Technology Partners 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
Application filed by Suisse Technology Partners AG filed Critical Suisse Technology Partners AG
Priority to EP17199512.9A priority Critical patent/EP3479919A1/fr
Publication of EP3479919A1 publication Critical patent/EP3479919A1/fr
Withdrawn legal-status Critical Current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
    • B21D22/201—Work-pieces; preparation of the work-pieces, e.g. lubricating, coating
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards

Definitions

  • the present invention relates to a cold forming process for sheets or metal foils.
  • Known means and methods for improving the cold workability of sheets or metallic foils relate, on the one hand, to the improvement of the sheet or film properties with regard to, for example, elongation at break or solidification and, on the other hand, the tribological properties during the forming process, i. the reduction of the coefficients of friction between the interacting surfaces in relative movement, for example by suitable lubrication.
  • WO 03/089507 A1 discloses, for example, a mixture for applying a polymeric, corrosion resistant and low-wear formable coating and a method of making this coating. Due to lubricious particles, the coating or the coating is suitable for a low-wear forming in the sense of less abrasion in the mass production of sheets or metal foils.
  • Object of the present invention is to provide a method which further improves or increases the cold workability of sheets or metal foils.
  • a plastic film is laminated on at least one side of the sheet or the metal foil before the cold forming of the sheet or the metal foil, wherein the plastic film or the plastic film sections on the sheet or metal foil surface so strongly liable / liable that the plastic film or whose sections do not detach from the sheet surface during the forming process, ie the adhesion must be greater than that during the forming process to the shearing forces acting between sheet metal or metal foil and plastic film.
  • the plastic film has a strain rate dependent on the strain rate, in which the tensile stress increases at higher deformation rate.
  • expansion stress behavior is used in the present text synonymous with stress-strain behavior or strength behavior. Accordingly, the material strength of the plastic film increases with increasing deformation or forming speed.
  • the elongation at break of the sheet to be formed is preferably increased by more than 2 percent by the action of a plastic film adhering to the sheet or the metal foil, provided that the adhesion of the plastic film to the at least one sheet or metal foil surface is greater than that between sheet metal during the forming process or metal foil and plastic film acting shear forces and provided that the plastic film has a strain rate dependent on the tensile stress, wherein the tensile stress increases at higher deformation rate.
  • the inventive forming method is preferred for cold forming of sheets (2) or metal foils, in particular for deep drawing, bending or stretch drawing of sheets for the automotive industry, such as Body parts, and used for building accessories, furniture, household appliances, housings and equipment panels, or for cold forming, in particular deep drawing or stretch drawing, of packaging films of metal.
  • sheets (2) or metal foils in particular for deep drawing, bending or stretch drawing of sheets for the automotive industry, such as Body parts, and used for building accessories, furniture, household appliances, housings and equipment panels, or for cold forming, in particular deep drawing or stretch drawing, of packaging films of metal.
  • pipe bending or bending of profiles are suitable as the bending process.
  • the sheet or metal foil is clamped between the die and a blank holder, and the between the clamped portions or at least part of that portion of the sheet or metal foil is reshaped by means of a punch.
  • the metal sheet or the metal foil between the die and a hold-down is held, but not clamped, so that the sheet metal or metal foil material located between the die and hold down during the thermoforming process can follow, with no sheet or foil thickness change as possible.
  • the sheets suitable for cold forming preferably have a sheet thickness of between 0.2 and 3 mm.
  • Metal foils suitable for the cold-forming process according to the invention typically have a film thickness of 8 ⁇ m to 40 ⁇ m.
  • only the sheet metal or metal foil surface (s) which is / are directed against the forming tool during the forming process is / are at least partially acted upon by an adhering plastic film.
  • that part of the forming device which causes the holding or clamping of the sheet or the metal foil does not count toward the forming tool.
  • both sides of the sheet or the metal foil are at least partially provided with an adhesive plastic film.
  • the shaping method according to the invention is particularly suitable for deep-drawing, stretch-drawing, bending or swaging.
  • the bending can For example, concern the bending of pipes or profiles, in particular, the areas which are held in a holding or clamping device, provided with a pipe or profile cavity reinforcing mandrel.
  • the movable part of the sheet or metal foil is understood to mean that part which is not fixed by the holding or clamping device of the forming device.
  • the plastic film is either on the directed against the forming tool side of the sheet or metal foil, or the plastic film is located on the remote from the forming surface of the sheet or metal foil.
  • the plastic film is preferably laminated to the bending tool opposite side of the sheet or metal foil, otherwise - due to the small radii - the plastic film is very strongly compressed at these points and so that there is a risk of delamination of the plastic film.
  • the plastic film (s) or their sections are / are glued to the sheet metal or metal foil surface (s).
  • the plastic film may also be a plastic layer sprayed or sprayed onto at least one side of the sheet or metal foil.
  • the portion of the sheet or the metal foil to be formed on at least one side of the sheet or the metal foil is at least partially acted upon by the plastic film.
  • Preferred materials for the plastic film are oriented polyamide (oPA), polyvinyl chloride (PVC), polypropylene (PP) or high density polyethylene (HDPE).
  • oPA oriented polyamide
  • PVC polyvinyl chloride
  • PP polypropylene
  • HDPE high density polyethylene
  • the sheet or metal foil is preferably made of steel or of an aluminum and / or magnesium alloy.
  • the thickness of the plastic film is preferably 20% to 500%, in particular 140% to 300%, of the sheet metal or metal foil thickness.
  • FIG. 1 illustrated Kalttiefzieh compiler a sheet 2 is held between a die 5 and a blank holder 4 and by means of a punch 3, which presses from top to bottom in the die 5, formed.
  • the sheet 2 is not clamped by the hold-down 4 on the die 5 here during deep drawing.
  • the sheet metal 2 located between the hold-down device 4 and the die 5 can slip during the deep-drawing process or when the stamp 3 is pressed downwards, with as little as possible a change in the thickness of the sheet 2.
  • a plastic film 1 is laminated on the side of the sheet 2, which faces upward or which abuts a stamp surface of the punch 3.
  • the plastic film 1 could also be laminated on one side of the sheet 2, which faces downwards or which faces a die surface of the die 5, or the sheet 2 is laminated on both sides with a plastic film 1.
  • Boundary shape change curves 10, 15 are shown. Such curves 10, 15 are used to determine the forming limits of a material and serve to predict the feasibility of a sheet metal forming task.
  • the minor change in shape as a minor change in the sheet plane as a function of the larger change in shape as the main shape change on the ordinate 25 is plotted on the abscissa 20.
  • Nakajima limit-forming curves 10, 15 shown were converted to failure with a hemispherical punch aluminum sheet metal plates of an AlMg 3 alloy with different geometries and a sheet thickness of 1.0 mm. By varying the width of the sample or by different waisting of the samples are very different deep and stretch drawing conditions from a uniform biaxial deformation to an almost pure tensile load on the sheet surface.
  • a lubrication package was placed between the punch of the measuring machine and the respective aluminum sheet metal blanks in order to determine the measuring points according to the standard ISO 12004-2.
  • the lubrication package is composed of different layers of material, which are defined in the above-mentioned standard, namely a directed against the sheet to be deformed lanolin layer with subsequent layers of teflon, lanolin, PVC, lanolin, Teflon and another lanolin layer, which is directed against the stamp surface.
  • the top of the material layers of the lubrication package which is pressed directly onto the sheet metal blanks sample, consists of lanolin.
  • a PVC layer with a layer thickness of 2 mm was arranged as the uppermost of the lubricating material layers, instead of the directed against the metal sheet to be formed lanolin layer.
  • Further layers following the PVC layer consist of lanolin, teflon, lanolin, teflon and another lanolin layer, which is directed against the stamp surface. Since the PVC layer sticks on the surface of the sheet metal blank during forming, or when the stamp of the measuring machine presses the lubricating package against the sheet metal blank sample, there is no lubricating effect.
  • the formability of the sheet metal blanks improves, which is confirmed by the measuring points of the limit forming curve 15 which are displaced upward on the ordinate 25 of the diagram and run parallel over the dashed curve 10.
  • a boundary deformation curve 15 shifted parallel upwards means that the deformability improves substantially equally in all tested geometries, or in other words that the PVC layer glued to the surface of the sheet metal blanks improves the formability of the sheet metal blanks irrespective of which geometry Sheet metal plate has.
  • the phenomenon of in FIG. 2 15 shows that the formability of the sheet metal blanks samples improves, although the lubricating effect achieved by the lubricating package with an uppermost PVC layer deteriorates.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP17199512.9A 2017-11-01 2017-11-01 Procédé de formage à froid pour tôles ou feuilles en métal Withdrawn EP3479919A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17199512.9A EP3479919A1 (fr) 2017-11-01 2017-11-01 Procédé de formage à froid pour tôles ou feuilles en métal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17199512.9A EP3479919A1 (fr) 2017-11-01 2017-11-01 Procédé de formage à froid pour tôles ou feuilles en métal

Publications (1)

Publication Number Publication Date
EP3479919A1 true EP3479919A1 (fr) 2019-05-08

Family

ID=60201884

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17199512.9A Withdrawn EP3479919A1 (fr) 2017-11-01 2017-11-01 Procédé de formage à froid pour tôles ou feuilles en métal

Country Status (1)

Country Link
EP (1) EP3479919A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0209393A2 (fr) * 1985-07-19 1987-01-21 Toyo Seikan Kaisha Limited Récipient formé par étirage et son procédé de fabrication
EP0312303A1 (fr) * 1987-10-15 1989-04-19 CMB Foodcan plc Feuille métallique revêtue
EP0455584A1 (fr) * 1990-04-26 1991-11-06 Alusuisse-Lonza Services Ag Procédé pour la fabrication d'un récipient stérilisable, en forme de cuvette, et récipient obtenu par ce procédé
WO2003089507A1 (fr) 2002-04-20 2003-10-30 Chemetall Gmbh Melange destine a l'application d'un revetement polymere resistant a la corrosion, pouvant etre façonne sans usure, et procede de fabrication de ce revetement
WO2016203785A1 (fr) * 2015-06-16 2016-12-22 東洋鋼鈑株式会社 Feuille métallique revêtue de résine de polyester et récipient l'utilisant

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0209393A2 (fr) * 1985-07-19 1987-01-21 Toyo Seikan Kaisha Limited Récipient formé par étirage et son procédé de fabrication
EP0312303A1 (fr) * 1987-10-15 1989-04-19 CMB Foodcan plc Feuille métallique revêtue
EP0455584A1 (fr) * 1990-04-26 1991-11-06 Alusuisse-Lonza Services Ag Procédé pour la fabrication d'un récipient stérilisable, en forme de cuvette, et récipient obtenu par ce procédé
WO2003089507A1 (fr) 2002-04-20 2003-10-30 Chemetall Gmbh Melange destine a l'application d'un revetement polymere resistant a la corrosion, pouvant etre façonne sans usure, et procede de fabrication de ce revetement
WO2016203785A1 (fr) * 2015-06-16 2016-12-22 東洋鋼鈑株式会社 Feuille métallique revêtue de résine de polyester et récipient l'utilisant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Fracture of Nano and Engineering Materials and Structures", 1 January 2006, SPRINGER NETHERLANDS, Dordrecht, ISBN: 978-1-4020-4972-9, article MARCUS SCHOSSIG ET AL: "Effect of Strain Rate on Mechanical Properties of Reinforced Polyolefins", pages: 507 - 508, XP055468105, DOI: 10.1007/1-4020-4972-2_251 *

Similar Documents

Publication Publication Date Title
Atrian et al. Deep drawing process of steel/brass laminated sheets
DE102009025821B4 (de) Verfahren zur Herstellung eines Metallbauteils
EP0706843B1 (fr) Procédé et dispositif pour la production de pièces courbées
EP2650108A1 (fr) Procédé de fabrication d'un demi-produit ou d'un composant à base d'un support métallique et d'un revêtement à base de plastique renforcé en fibres de verre, demi-produit ou composant à cet effet et utilisation pour la fabrication d'un composant de structure
EP3177416B1 (fr) Procédé de fabrication de composants formés à chaud
DE102011015732A1 (de) Fluid cooling during hot-blow-forming of metal sheets and tubes
DE60007054T2 (de) Verbundblech zum Tiefziehen
DE102014108113A1 (de) Verfahren zur Herstellung eines Kraftfahrzeugbauteils aus Aluminium
WO2013160234A1 (fr) Procédé de fléchissement d'une tôle composite et tôle composite fléchie
DE102013105673B4 (de) Presswerkzeug und Verfahren zur Herstellung eines Faserverbundwerkstoff-Hybridbauteils
WO2017129609A1 (fr) Bande d'alliage en aluminium pour liaison adhésive
EP3479919A1 (fr) Procédé de formage à froid pour tôles ou feuilles en métal
DE102012106420A1 (de) Verfahren und Vorrichtung zum Biegen eines Leichtblechs
DE102011009891A1 (de) Verfahren zum Herstellen von Blechbauteilen sowie Vorrichtung zur Durchführung des Verfahrens
EP3253508B1 (fr) Procédé de fabrication d'un composant à partir d'un matériau sandwich et composant constitué d'un matériau sandwich
DE102014108114A1 (de) Verfahren zur Herstellung eines Kraftfahrzeugbauteils aus Aluminium
US11123785B2 (en) Surface-treated steel sheet part having cut end surface, and cutting method therefor
DE102009039081A1 (de) Verfahren zum Herstellen eines Verbundbauteils
WO2019042855A1 (fr) Procédé de fabrication d'un matériau composite de chevauchement en tôle
Fereshteh-Saniee et al. An experimental investigation on the deep drawing process of steel–brass bimetal sheets
EP4188691B1 (fr) Matériau composite pour palier lisse
EP1048438B1 (fr) Procédé pour produire des conteneurs d'emballage
EP3147041B1 (fr) Procédé et appareil de cintrage d'un produit semi-fini métallique
DE102006057762A1 (de) Verfahren zur Herstellung von Kopfschrauben
RU2459680C2 (ru) Способ обтяжки листовых 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): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20191109