EP3488944A1 - Procédé de production d'un corps de boîte métallique par étirage de paroi - Google Patents

Procédé de production d'un corps de boîte métallique par étirage de paroi Download PDF

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Publication number
EP3488944A1
EP3488944A1 EP18208554.8A EP18208554A EP3488944A1 EP 3488944 A1 EP3488944 A1 EP 3488944A1 EP 18208554 A EP18208554 A EP 18208554A EP 3488944 A1 EP3488944 A1 EP 3488944A1
Authority
EP
European Patent Office
Prior art keywords
wall
ironing
cup
ring
ironing ring
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.)
Pending
Application number
EP18208554.8A
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German (de)
English (en)
Inventor
Emile JASPERSE
Frederik Jonker
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 EP3488944A1 publication Critical patent/EP3488944A1/fr
Pending 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
    • 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
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner

Definitions

  • the invention relates to a process for the production of a can body comprising a base and a tubular body from sheet metal which is coated on at least one side with a polymer layer, in which process, firstly, a round disc is produced from the sheet metal, which disc is then deep-drawn into a cup which has a polymer layer at least on the outside, after which this cup is formed into a can body by wall ironing, the wall ironing taking place in a single stroke by moving the cup successively through one or more wall-ironing rings.
  • EP0402006-A1 is based on a laminate comprising an aluminium sheet.
  • This patent proposes that the problems with processing of this laminate be solved by employing a combination of a proposed exit angle from a wall-ironing ring and an entry angle thereof which is selected between 1 and 4° and external cooling after each wall-ironing step.
  • This patent also proposes a specific selection of material for the wall-ironing ring.
  • US Patent A-3,765,206 proposes the wall ironing of cans from coated steel utilizing a single wall-ironing ring with an entry angle of between 4 and 6°.
  • the entry angle is understood to mean the angle which the plane of entry to a wall-ironing ring forms with the axis of the said ring.
  • this document relates only to steel sheet with a metallic coating.
  • EP0298560-A2 describes a method of wall ironing in two die regions in which in one die region hydrodynamic lubrication under pressure is applied, whereas in the other die region there is no lubrication.
  • a process for the production of a can body comprising a base and a tubular body from sheet metal which is coated on one side with a polymer layer, in which process first a round disc is produced from the sheet metal, which disc is then deep-drawn into a cup, wherein the outside of the cup is provided with said polymer layer, after which this cup is redrawn and subsequently formed into a can body by wall ironing, the wall ironing taking place in a single stroke by moving the redrawn cup successively through one or more wall-ironing rings by means of a punch, characterized in that the used sheet metal is selected from the group of sheet metals consisting of (uncoated steel sheet (blackplate), tin coated steel sheet (tinplate), chromium-chromium oxide coated steel sheet (ECCS), tinplate which was diffusion annealed to form an iron-tin alloy consisting of at least 80% of FeSn (50 at.% iron and 50 at.% tin) thereupon
  • the phrase 'moving the redrawn cup successively through one or more wall-ironing rings by means of a punch' means that the external diameter of the can body is the same everywhere along the can body, and that there is no remaining flange on the can body after the drawing.
  • the direction of movement of the cup and can is the same (see figure 1 ).
  • GB2547016 discloses a process where there is always a flange remaining on the can body. This means that the can body is not pushed through the rings but is halted to retain the flange and the can must be retracted to remove it from the process. The direction of movement of the cup and can is reversed near the end.
  • the flange in GB2547016 has to be removed afterwards leading to significant waste compared to the optional trimming of the can body according to the invention.
  • the invention therefore consists in the fact that, when a sheet metal is used which has been selected from the group consisting of i). uncoated steel sheet (blackplate), ii). tin coated steel sheet (tinplate), iii). chromium-chromium oxide coated steel sheet (ECCS), iv). tinplate which was diffusion annealed to form an iron-tin alloy consisting of at least 80% of FeSn (50 at.% iron and 50 at.% tin) thereupon, or v).
  • the advantage of the wall-ironing ring or rings according to the invention is that scuffing due to shear in the polymer coating during wall ironing is prevented or minimised. If more than one ring is used, the entry angle for each successive wall-ironing ring has to be smaller than that of the preceding ring. In the second and any further wall-ironing rings following the first wall-ironing ring the entry angle should become smaller in order to prevent scuffing. It was found that the entry angle for the first wall-ironing ring should be between 3.5 and 4.5° in order to prevent the expansion force in this first ring becoming excessive.
  • a coolant is meant that is applied directly to the can during the wall-ironing operation as in EP0402006-A1 .
  • the coolant usually also contains lubricant or provides lubrication by itself to facilitate the wall-ironing operation.
  • the polymer layers provide the lubrication.
  • internal cooling in the form of internal cooling of the punch and/or the wall-ironing rings or the spacers between the rings. In this case no external coolant is necessary.
  • This process referred to as a dry process, is not hampered by large amounts of coolant that need to be processed and the can bodies need not be rinsed to remove the excess coolant and dried afterwards.
  • the polymer layer preferably comprises two or more layers, each with their specific properties. It is preferable to use a three-layer polymer coating system on each side of the substrate.
  • the three layers of coating on each side of the substrate comprise an adhesion layer, a main layer and a surface layer with optimised interface properties, such as release properties, an optimised adhesion to steel is provided by the adhesion layer, and the main layer has a more general functionality such as providing barrier properties.
  • a cylindrical land zone having a length L is present between the entry and the exit of each wall ironing ring wherein L is at most 0.6 mm, preferably at most 0.5 mm, more preferably at most 0.3 mm, preferably wherein L of the first wall ironing ring is different from L of the second wall ironing ring.
  • the wall-ironed can body is sometimes very tightly adhered to the punch as a result of the smoothness of the punch and inner surface of the can body and the retained tension in the can.
  • the reduction in the second wall-ironing ring (RED2) or, in case of more than two wall-ironing rings being used, the reduction in the last wall-ironing ring (RED_Last) is chosen such so as to remove tension in the can body thereby facilitating the stripping of the can body from the punch.
  • the reduction RED2 (or RED_Last) is preferably chosen low, preferably between 0.1 and 10%.
  • the wall thickness of the cup is reduced by a value RED1 between 10 and 60 % in the first wall-ironing ring and wherein, if present, the wall thickness is further reduced by a value RED2 of between 0.1 and 30% in the second wall-ironing ring. More preferably the wall thickness of the cup is reduced by a value RED1 between 20 and 55 % in the first wall-ironing ring and/or the wall thickness of the cup is further reduced in the second wall-ironing ring by a value RED2 of at least 2%, preferably more than 5 %.
  • a three layer polymer coating system with a total thickness of 30 ⁇ m is applied to one side of a steel strip (the side becoming the outside of the can) with a thickness of between 0.10 and 0.50 mm by means of film lamination.
  • the coated strip obtained is used to produce, in two steps, a cup with a diameter of 73 mm, the polymer-coated side forming the outside of the cup.
  • a cup with a diameter of 100 mm is deep drawn from a round disc with a diameter of 150 mm.
  • this cup is formed into a cup having the final diameter of 73 mm by a further deep-drawing operation. See Fig. 1 for the schematic representation.
  • This cup is fed to a wall ironing machine in which the wall thickness of the cup is reduced by wall ironing at a speed of between 180 and 600 strokes per minute and using a redraw ring followed by a first wall-ironing ring with an entry angle ⁇ 1 and an exit angle ⁇ 1 , which reduces the wall thickness of the cup by a value (RED1) between 10 and 60 % and a second wall-ironing ring an entry angle ⁇ 2 and an exit angle ⁇ 2 , which reduces the wall thickness of the cup by a value RED2 between 2 and 25%.
  • RED1 between 10 and 60 %
  • a second wall-ironing ring an entry angle ⁇ 2 and an exit angle ⁇ 2
  • Adhesion layer Main layer Surface layer Food Optimised for sterilisation Optimised for non-blushing performance or coating colour Optimised for forming performance or content release Aerosol Optimised for heat resistance Optimised for barrier performance or coating colour Optimised for print General Line (Paint) Optimised for chemical resistance Optimised for barrier properties or coating colour Beer and beverage Optimised for adhesion Optimised for barrier performance, deformation stresses and coating colour Optimised for forming performance and print
  • the entry angle ⁇ for the first wall-ironing rings is preferably between about 1.5 and 2.5 °. This is believed to be caused by the hard titanium dioxide particles have a scouring effect that increases the risk of damage to the film when being processed with an entry angle for the first wall-ironing ring of between 3.5 and 4.5°.
  • a white titanium dioxide pigmented coating can be further processed with the exit angle ( ⁇ ) of the first ring between 2.5 and 3.5° and an entry angle ( ⁇ ) for the second wall-ironing ring, if present, of between 1.5 and 2.5° and the exit angle ( ⁇ ) is between 2.75 and 3.25°, similar to the method according to the invention.
  • the polymer coated steel substrates that can be processed by the process according to the invention are preferably based on polycondensates, such as polyesters, copolyesters (including PET, PBT, polyethylene furanoate (PEF), poly(lactic acid) (PLA)) or polyamides, polyolefins, elastomers, crystallisable polyaddition polymers, or any other polymer that can be formed in a film by extrusion.
  • the polymer coating may consist of one or more layers.
  • the polymer coating layer comprises or consists of polyethylene terephthalate, IPA-modified polyethylene terephthalate, CHDM-modified polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyethylene furanoate, poly (lactic acid) or copolymers or blends thereof.
  • Fig. 1 shows various processing systems in various processing phases
  • Fig. 2 shows a detail of a wall ironing operation
  • Fig. 3 shows a schematic detail of the workface of an ironing ring with a land zone between the (frusto-conical) entry and exit plane.
  • Fig. 1 illustrates how a preformed deep-drawn cup 3 is formed into a finished wall-ironed can body 9.
  • the cup 3 is placed between a redraw sleeve 2 and a redraw die 4.
  • punch 1 moves to the right, the cup 3 is brought to an internal diameter of the final finished can 9 by the redrawing step.
  • the punch 1 successively forces the product through (in this example) two wall-ironing rings 6 and 7.
  • Ring 8 is an optional stripper ring.
  • Wall ironing provides the can body 9 to be formed with its ultimate wall thickness and wall length.
  • the base of can body 9 is formed by moving punch 1 towards an optional base tool 10.
  • Retracting punch 1 allows to detach can 9 from the punch 1 so that it can be discharged in the transverse direction.
  • the optional stripper ring may assist in this.
  • the can 9 is then subsequently trimmed, optionally necked and provided with a lid after filling.
  • Fig. 2 provides a detailed illustration of the passage of a part of the can wall to be formed through, for example, wall-ironing ring 5.
  • Punch 1 is indicated diagrammatically.
  • the entry plane for wall-ironing ring 5 runs at an entry angle ⁇ to the direction of the axis of the wall-ironing ring.
  • the thickness of the material of the wall to be formed is reduced between punch 1 and wall-ironing ring 5.
  • This material comprises the actual metal can body wall 11 with layers of polymer 12 and 13 on either side.
  • the layer of polymer 12 becomes the outside of the can body, and the layer of polymer 13 becomes the inside of the can body, eventually coming into contact with the contents of the can.
  • the figure illustrates how the thickness of all three layers 11, 12 and 13 is reduced.
  • Fig. 3 shows a schematic detail of the workface of an ironing ring with a land zone between the (frusto-conical) entry and exit plane.
  • the radii of the transfer between the land zone and the entry plane and the radius of the transfer between the land zone and the exit plane are between 0.1 and 10 mm, preferably between 0.2 and 5 mm.
  • the wall ironing rings are preferably provided with a land zone of length L which is located between connects the frusto-conical entry surface and the frusto-conical exit surface of the ring.
  • the land zone is a cylindrical ring and has a length of at most 0.6 mm, preferably of at most 0.5 mm, and even more preferably of at most 0.3 mm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP18208554.8A 2017-11-27 2018-11-27 Procédé de production d'un corps de boîte métallique par étirage de paroi Pending EP3488944A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17203790 2017-11-27

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EP3488944A1 true EP3488944A1 (fr) 2019-05-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110217464A (zh) * 2019-06-29 2019-09-10 广州荣鑫容器有限公司 一种可灌装568-580ml的金属罐及其制作方法
CN112427562A (zh) * 2020-11-02 2021-03-02 中材科技(成都)有限公司 一种压力容器钢质内胆的卧式冷拉深设备及其冷拉深方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765206A (en) 1969-09-05 1973-10-16 Bethlehem Steel Corp Method of forming coated seamless containers
EP0298560A2 (fr) 1987-07-10 1989-01-11 Hoogovens Groep B.V. Procédé et appareil de repassage de la paroi d'un corps cylindrique d'une seule pièce et corps ainsi fabriqué
EP0402006A1 (fr) 1989-06-08 1990-12-12 CarnaudMetalbox plc Procédé et dispositif pour le façonnage de corps creux par repassage de la paroi
JPH05337563A (ja) * 1991-09-20 1993-12-21 Aida Eng Ltd 内面部に複数の溝を有する部品の精密仕上げ加工方法
JPH10249462A (ja) * 1997-03-11 1998-09-22 Kishimoto Akira 製缶工具およびそれを用いた製缶方法
WO2009123295A1 (fr) * 2008-03-31 2009-10-08 Ｊｆｅスチール株式会社 Procédé de formation de boîtes par emboutissage-étirage (di)
GB2547016A (en) 2016-02-04 2017-08-09 Crown Packaging Technology Inc Metal containers and methods of manufacture

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3765206A (en) 1969-09-05 1973-10-16 Bethlehem Steel Corp Method of forming coated seamless containers
EP0298560A2 (fr) 1987-07-10 1989-01-11 Hoogovens Groep B.V. Procédé et appareil de repassage de la paroi d'un corps cylindrique d'une seule pièce et corps ainsi fabriqué
EP0402006A1 (fr) 1989-06-08 1990-12-12 CarnaudMetalbox plc Procédé et dispositif pour le façonnage de corps creux par repassage de la paroi
JPH05337563A (ja) * 1991-09-20 1993-12-21 Aida Eng Ltd 内面部に複数の溝を有する部品の精密仕上げ加工方法
JPH10249462A (ja) * 1997-03-11 1998-09-22 Kishimoto Akira 製缶工具およびそれを用いた製缶方法
WO2009123295A1 (fr) * 2008-03-31 2009-10-08 Ｊｆｅスチール株式会社 Procédé de formation de boîtes par emboutissage-étirage (di)
GB2547016A (en) 2016-02-04 2017-08-09 Crown Packaging Technology Inc Metal containers and methods of manufacture

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110217464A (zh) * 2019-06-29 2019-09-10 广州荣鑫容器有限公司 一种可灌装568-580ml的金属罐及其制作方法
CN110217464B (zh) * 2019-06-29 2024-01-23 广州荣鑫容器有限公司 一种568-580ml金属罐的制作方法
CN112427562A (zh) * 2020-11-02 2021-03-02 中材科技(成都)有限公司 一种压力容器钢质内胆的卧式冷拉深设备及其冷拉深方法
CN112427562B (zh) * 2020-11-02 2023-09-26 中材科技(成都)有限公司 一种压力容器钢质内胆的卧式冷拉深设备及其冷拉深方法

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