EP4058283A1 - Procédé de fabrication d'une pièce en acier ou en aluminium - Google Patents

Procédé de fabrication d'une pièce en acier ou en aluminium

Info

Publication number
EP4058283A1
EP4058283A1 EP20801324.3A EP20801324A EP4058283A1 EP 4058283 A1 EP4058283 A1 EP 4058283A1 EP 20801324 A EP20801324 A EP 20801324A EP 4058283 A1 EP4058283 A1 EP 4058283A1
Authority
EP
European Patent Office
Prior art keywords
polymer
sheet
layer
steel
coating
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Withdrawn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
EP20801324.3A
Other languages
German (de)
English (en)
Inventor
Chiel Matthias DANE
Jan Paul Penning
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.)
Tata Steel Ijmuiden BV
Original Assignee
Tata Steel Ijmuiden BV
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 Tata Steel Ijmuiden BV filed Critical Tata Steel Ijmuiden BV
Publication of EP4058283A1 publication Critical patent/EP4058283A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/085—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/088—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/09—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/06—Coating on the layer surface on metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating

Definitions

  • the invention relates to a method for producing a part of steel or aluminium, for instance for automotive purposes.
  • flat sheets or blanks are cut from strip material produced by the steel or aluminium manufacturers. These flat sheets or blanks have to be (de)formed before they can be used in cars or other products, for instance by pressing, deep drawing, bending or roll forming.
  • the sheet or blank has to be deformed three-dimensionally in a pressing tool.
  • a pressing tool high friction can exist between the sheet and the tooling; the resulting friction forces reduce the forming capacity.
  • an oil layer is applied on the sheet or blank.
  • part can be attached to other parts or other material in an easy way.
  • a part that is degreased is not seen as the best starting point for attaching.
  • the method of the invention comprising the following steps: providing a steel or aluminium sheet; providing a coating on one or both sides of the sheet, wherein the coating consists of one or more polymer layers, wherein the polymer is a thermoplastic polymer; and forming the coated sheet into a part by pressing, stamping, deep drawing, roll forming, bending, hydroforming or stretching after the polymer layer(s) have been provided on the sheet.
  • the sheet will act as a lubricant between the sheet and the tool for deforming the sheet. In this way, the friction between the sheet and the tool is reduced.
  • the polymer coating remains on the part produced using the tool.
  • each layer consists of a polymer from the group of:
  • thermoplastic polymers in each of these four groups can be used as a layer, both when the coating consists of one layer and when the coating consists of two or more layers.
  • the polymer is chosen such that:
  • a polyolefin is selected from the group of polyethylenes, polypropylenes, polyethylene copolymers, polypropylene copolymers, chemically modified polyolefins such as maleic anhydride grafted polyethylene or polypropylene, or is a combination of two or more of these polyolefins;
  • a polyamide is selected from the group of polyamide 6 (PA6), polyamide 6.6 (PA6.6), polyamide 4.6 (PA4.6) or is a combination of two or more of these polyamides;
  • a polyester is selected from the group polyethylene terephthalate (PET), polybutylene terephthalate (PBT), a copolyester containing isophthalic acid (I PA) and/or cyclohexanedimethanol (CHDM), or is a combination of two or more of these polyesters;
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • I PA isophthalic acid
  • CHDM cyclohexanedimethanol
  • a polycarbonate is a polycarbonate of Bisphenol A.
  • these groups of polyolefins, polyamides, polyesters and polycarbonates are suitable as a layer on a steel or aluminium sheet that is to be deformed, in view of their adherence properties on steel and aluminium, and/or in view of their lubricating properties relative to the deformation tool.
  • the polymer coating is suitable to act as a lubricant, it is advantageous when the coated sheet is formed free from an applied lubricant or oil.
  • an applied lubricant or oil there is no need to apply a layer of an oil or other lubricant on the strip or sheet, and thus also no need to remove this layer after the sheet has been formed or deformed into a part.
  • not using an applied lubricant or oil means a reduction in processing steps and thus a reduction in cost.
  • a so-called “oil-free press shop” is seen as advantageous by the industry.
  • the sheet When using the polymer coated sheet according to the invention for deep drawing, for instance, the sheet is deformed between a punch and a die, while the circumference of the sheet or blank is kept under a compression force by a blank holder.
  • the distance between the punch and the die is larger than the thickness of the polymer coated sheet, that is the combined thickness of the sheet and the polymer coating. In this way the polymer coating can act as a lubricant.
  • the polymer coating with remain adhered to the sheet and deforms together with the sheet.
  • the distance between the punch and the die is approximately 1.2 times the thickness of the polymer coated sheet, so between 1.1 and 1.4 times the thickness of the polymer coated sheet.
  • the steel sheet is cut from a hot-rolled steel strip or from a hot-rolled and subsequently cold-rolled steel strip.
  • a hot-rolled or cold-rolled strip to cut the sheet from is the easiest and most cost-effective way to provide a sheet for the present method.
  • Such a strip can be produced in the required composition and with the required properties.
  • the steel sheet can for instance be a formable steel sheet for outer panels for automotive purposes, a high strength steel sheet for the chassis of a car, or a steel sheet for the white goods industry. Such sheet are known as such to the skilled person.
  • the hot rolled or cold rolled strip has a width of less than 600 mm.
  • Steel strips having this width are suitable to cut out sheets or blanks that can be formed by for instance deep drawing.
  • the hot rolled or cold rolled steel strip preferably has a thickness of at least 0,66 mm, preferably a thickness of at least 0,68 mm.
  • the strip has a maximum thickness of 4 mm, because thicker sheets or blanks are difficult to form and took heavy for use.
  • the high strength steel sheet used can be a HSLA steel, a AHSS or a UHSS, such as a DP steel, a CP steel or a TRIP steel, which usually have a thickness between 0,8 and 2,5 mm.
  • a HSLA steel a HSSS or a UHSS
  • DP steel a DP steel
  • CP steel a CP steel or a TRIP steel
  • Such steel types are known to the person skilled in the art and ned no further elucidation.
  • steel sheet for outer panels which are made from a mils steel such as DX or BH steel, which sheets usually have a thickness between 0,7 and 1 ,5 mm.
  • standard cold rolled steel sheets or blanks can be used.
  • the steel sheet consists of a steel having a UTS of at least 600 MPa, more preferably a UTS of at least 800 MPa, preferably the steel sheet being a AHSS or UHSS such as DP, CP, TRIP, TWIP steel.
  • AHSS AHSS
  • UHSS such as DP, CP, TRIP, TWIP steel
  • the steel sheet is coated with a metal or metal alloy layer that is present between the steel sheet and the one or more polymer layers, preferably the steel sheet is coated with a zinc or zinc alloy layer, more preferably the zinc or zinc alloy layer being a EG or GA or Gl or ZM applied layer and/or the steel sheet is treated with an adhesion promotor or conversion coating, and wherein the steel sheet coated with a GA or Gl or ZM layer is preferably coated by hot dip coating.
  • a metal or metal alloy it is almost always a requirement that the steel sheet is coated with a metal or metal alloy to reduce or prevent corrosion.
  • a conversion coating or adhesion promotor is often required when a polymer coating must be applied on a metal or metal alloy that is present on the steel sheet.
  • the aluminium sheet consists of AA5xxx, AL6xxx or AA7xxx. These aluminium alloys are frequently used in the automotive industry for outer panels or chassis components.
  • the polymer coating consists of more than one layer, in which the layer contacting the metal sheet is a (co)polyester or a chemically modified polyolefin or a polycarbonate.
  • a (co)polyester or a chemically modified polyolefin or a polycarbonate is very suitable as layer in direct contact with the metal sheet in view of its bonding properties.
  • the polymer coating consists of more than two layers, in which the outermost layer, facing away from the metal sheet, is a (co)polyester or a chemically modified polyolefin or a polycarbonate.
  • a (co)polyester or a chemically modified polyolefin or a polycarbonate is also very suitable as outermost layer in view of its adhesion properties to other materials.
  • the outermost layer, facing away from the metal sheet contains certain additives to reduce the friction coefficient of the coating, such as insoluble ‘anti-block’ particles and organic slip additives.
  • additives which are known per se, improves the lubricating effect of the polymer coating by reducing the friction coefficient thereof.
  • the polymer coating consists of one layer that is a (co)polyester or a chemically modified polyolefin or a polycarbonate. Using only one layer as a coating simplifies the production process of the strip or sheet to a certain extent.
  • a polymer coating has a layer contacting the metal sheet with a thickness between 2 and 10 pm, and the polymer coating has a thickness between 10 and 200 pm.
  • the polymer coating has a thickness between 10 and 90 pm , more preferably a thickness between 10 and 70 pm. These thicknesses provide the polymer coating with a good strength during deformation, such that disruption of the coating is reduced. Especially thinner polymer coatings are less likely to deform during the forming process.
  • a further layer is attached to the part, which further layer at least partly consists of a polymer and optionally further consists of flexible material such a fibres, to form a steel-polymer hybrid part.
  • a polymer coating on the part that is formed in accordance with the invention thus has the further advantage that a further layer can be easily attached to the formed part.
  • the coating on the part consists of a polymer
  • the further layer at least partly consists of a polymer as well. Adhesion between the coating and the further layer can thus be realised by choosing suitable polymers for both the coating and the further layer.
  • a further layer is attached to the polymer coated sheet before the forming of a part, which further layer at least partly consists of a polymer and optionally further consists of flexible material such a fibres, to form a steel-polymer hybrid part.
  • the part that is formed is directly a hybrid part, without any further processing step. Since the adhering of a further layer to a flat sheet is much easier than the adhering to a formed sheet, this is an advantageous method. Of course the further layer has to be able to withstand the forming step.
  • any of the above inventive methods it is possible, after the forming of a part from the polymer coated sheet, to apply a polymer three-dimensional body against the polymer layer of the part, preferably by injection moulding in a die for forming the part.
  • the part that is formed has a side that is provided with an at least partially polymeric layer, it is possible to apply the three-dimensional body to the part.
  • Injection moulding is a suitable way to apply the three-dimensional body, because a very good adherence can be obtained.
  • the part is painted after the preceding steps have been performed. This is often needed when the part is used for automotive purposes, but also for other purposes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un procédé de fabrication d'une pièce en acier ou en aluminium, par exemple à des fins automobiles. Selon l'invention, le procédé comprend les étapes suivantes : - la fourniture d'une tôle d'acier ou d'aluminium ; - la fourniture d'un revêtement sur un ou les deux côtés de la feuille, le revêtement étant constitué d'une ou de plusieurs couches de polymère, le polymère étant un polymère thermoplastique ; - et la formation de la feuille revêtue en un élément par pressage, estampage, emboutissage profond, formage par laminage, cintrage, hydroformage ou étirement après disposition de la ou des couches de polymère sur la feuille.
EP20801324.3A 2019-11-13 2020-11-11 Procédé de fabrication d'une pièce en acier ou en aluminium Withdrawn EP4058283A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP19208941 2019-11-13
PCT/EP2020/081808 WO2021094404A1 (fr) 2019-11-13 2020-11-11 Procédé de fabrication d'une pièce en acier ou en aluminium

Publications (1)

Publication Number Publication Date
EP4058283A1 true EP4058283A1 (fr) 2022-09-21

Family

ID=68581459

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20801324.3A Withdrawn EP4058283A1 (fr) 2019-11-13 2020-11-11 Procédé de fabrication d'une pièce en acier ou en aluminium

Country Status (2)

Country Link
EP (1) EP4058283A1 (fr)
WO (1) WO2021094404A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023222211A1 (fr) 2022-05-18 2023-11-23 Eos Imaging Méthode d'imagerie radiologique avec image de scannogramme à plusieurs niveaux d'énergie

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8724240D0 (en) * 1987-10-15 1987-11-18 Metal Box Plc Laminated metal sheet
FR2866592B1 (fr) * 2004-02-19 2007-06-08 Usinor Procede de fabrication d'une piece composite
AU2012280627B2 (en) * 2011-07-07 2016-01-21 Tata Steel Nederland Technology B.V. Polyamide-imide coated substrate

Also Published As

Publication number Publication date
WO2021094404A1 (fr) 2021-05-20

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