EP0733414A1 - Herstellungsverfahren eines Metallbehälters in einer Form - Google Patents

Herstellungsverfahren eines Metallbehälters in einer Form Download PDF

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Publication number
EP0733414A1
EP0733414A1 EP96400484A EP96400484A EP0733414A1 EP 0733414 A1 EP0733414 A1 EP 0733414A1 EP 96400484 A EP96400484 A EP 96400484A EP 96400484 A EP96400484 A EP 96400484A EP 0733414 A1 EP0733414 A1 EP 0733414A1
Authority
EP
European Patent Office
Prior art keywords
zone
expansion
expanded
peripheral skirt
elementary
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.)
Granted
Application number
EP96400484A
Other languages
English (en)
French (fr)
Other versions
EP0733414B1 (de
Inventor
Patrick Erhard
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0733414A1 publication Critical patent/EP0733414A1/de
Application granted granted Critical
Publication of EP0733414B1 publication Critical patent/EP0733414B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B21D15/00—Corrugating tubes
    • B21D15/04—Corrugating tubes transversely, e.g. helically
    • B21D15/06—Corrugating tubes transversely, e.g. helically annularly
    • 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
    • B21D22/10—Stamping using yieldable or resilient pads
    • B21D22/105—Stamping using yieldable or resilient pads of tubular products
    • 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 subject of the present invention is a method of manufacturing a shaped metal can, of the beverage can or food can type and more particularly a shaped metal can comprising, on the one hand, a bottom and a cylindrical peripheral skirt integral with said bottom and comprising at least one expanded zone and, on the other hand, a cover crimped on the peripheral skirt.
  • the cover is provided for example with an easy opening device by breaking a line of least resistance or for example a threaded neck intended to receive a screw cap.
  • the peripheral skirt of this type of metal box consists of a cylindrical shell welded longitudinally and comprising at least one expanded zone.
  • the peripheral skirt is produced from a metal blank of mild steel with low carbon content and having an elastic limit of the order of 250 MPa.
  • a mild steel of this type allows local expansion of the welded cylindrical shell without great difficulty with an expansion rate calculated according to the formula: D final - D initial D initial x 100 up to 20%, D initial being the initial diameter of the welded shell and D final being the diameter of the peripheral skirt welded after expansion.
  • the welded shell is produced, the said shell is locally expanded to obtain a peripheral skirt comprising at least one expanded zone and a bottom and a cover are crimped respectively at each end of the peripheral skirt.
  • the formation of the expanded zone is generally carried out by carrying out an overall expansion over the entire height of the zone to be expanded, either by an air or nitrogen pressure forming process or by a forming process. using an incompressible fluid or either by a mechanical expansion process using a sector tool.
  • the bottom and the peripheral skirt formed integrally with this bottom are produced from a cup cut from a metal blank or a strip, either by stamping-re-stamping, or by stamping-ironing.
  • the overall possible expansion rate of the peripheral skirt is of the order of 2.5%.
  • the overall possible expansion rate of the peripheral skirt is less than 1%, or even for very small thicknesses, less than 0.5%.
  • the advantage of such a metal box produced by the stamping-re-stamping technique or by the stamping-ironing technique is that it allows very small thicknesses because the constituent metal is a very stiff metal, at high mechanical characteristics, which induces a low weight and a low material cost.
  • such a box is made in two parts, the bottom and the peripheral skirt having been made of material, thus conferring an advantage from an aesthetic point of view.
  • the object of the present invention is to propose a method for manufacturing a shaped metal can, of the beverage can type, comprising a bottom and a peripheral skirt formed integrally with said bottom, said peripheral skirt comprising at least one expanded zone of which the expansion rate is around 8% in the case of a deep drawing-deep drawing technique and around 3% in the case of a deep drawing-ironing technique.
  • the subject of the invention is therefore a method of manufacturing a shaped metal can, of the beverage can type, comprising, on the one hand, a bottom and a cylindrical peripheral skirt formed integrally with said bottom and comprising at least one expanded area and, on the other part, a cover crimped onto the peripheral skirt, characterized in that said at least zone is produced by performing at least one step consisting of locally and successively expanding elementary zones of the peripheral skirt starting with a first elementary zone located on closer to the bottom to a last elementary zone furthest from said bottom, said elementary zones partially overlapping to obtain said at least expanded zone.
  • the shaped box of the beverage box type, comprises a bottom 1 and a peripheral skirt 2 made integrally with said bottom 1.
  • the form box may include several expanded zones separated by intermediate zones each having a diameter less than the diameter of the expanded zones.
  • the external profile of the expanded zone 2B can be flat as shown in FIG. 1 or curved as shown in FIG. 2.
  • a metal blank made of steel, or aluminum or aluminum alloy is formed, either by a stamping-re-stamping technique, or by a stamping-ironing technique, a blank comprising a bottom and a peripheral skirt of diameter equal to the diameter D of zone 2A of the peripheral skirt 2 of the box formed.
  • the expanded zone is formed by carrying out an overall expansion over the entire height of the zone to be expanded, for example by an air or air forming process. nitrogen under pressure or by a forming process using an incompressible fluid or by a mechanical expansion process using a sector tool.
  • the rate of expansion of the peripheral skirt is limited because the metal has a significant work hardening at the level of this skirt due to the formation or stretching of the wall of said skirt.
  • Shaped boxes were prepared from this steel, on the one hand, by stamping-re-stamping a metal blank to form cylindrical blanks consisting of a bottom and a peripheral skirt of diameter D equal to 84mm, integral with said bottom and, on the other hand, by stamping-ironing of a metal blank to form cylindrical blanks of diameter D equal to 66mm, corresponding to the usual beverage cans.
  • an average elastic limit in the walls of the peripheral skirt Re equal to 600 MPa was measured on the blanks and an average thickness of the wall of the peripheral skirt at center of the area to be expanded equal to 0.15mm.
  • zone 2B After formation of zone 2B by global expansion, it is found that the maximum diameter that it is possible to obtain is equal to 86.1 mm. If the diameter of the box is further increased in the expanded area, there is a tear in the metal of the wall of the peripheral skirt.
  • the thickness of the wall of the peripheral skirt in the center of the expanded zone 2B with a diameter equal to 86.1 mm is equal to 0.12 mm.
  • the maximum rate of expansion authorized for such a box is equal to 2.5%.
  • an average elastic limit in the walls of the peripheral skirt Re equal to 720 MPa and an average thickness of the wall of the peripheral skirt was also measured on the blanks. in the center of the area to be expanded equal to 0.145mm.
  • zone 2B After formation of zone 2B by global expansion, it is found that the maximum diameter that it is possible to obtain is equal to 66.3mm, that is to say a maximum expansion rate equal to 0.4%.
  • the thickness of the wall at the center of the expanded zone 2B is equal to 0.135 mm.
  • the expansion rate obtained before rupture of the metal is of the order of 2.5% and in the case of a shaped box obtained by stamping-ironing the expansion rate before the metal breaks is of the order of 0.4%.
  • the method according to the invention makes it possible to produce, on this type of shaped box, at least one expanded zone, the expansion rate of which is significantly increased.
  • the manufacturing method according to the invention consists in producing the expanded zone 2B by carrying out at least one step consisting in locally and successively expanding elementary zones 10a, 10b, 10c ... 10n, from the peripheral skirt 2, starting with a first elementary zone 10a located closest to the bottom 1 up to a last elementary zone 10n most distant from said bottom.
  • the elementary zones 10a, 10b, 10c ... 10n partially overlap to obtain the zone 2B expanded.
  • the formation of the elementary zones 10a, 10b, 10c ... 10n is carried out in several stages, that is to say in several successive passes so as to obtain, as shown in FIGS. 1 and 2, a first diameter D '1 less than the diameter D1 and so on until the final diameter D1 of the expanded zone 2B is obtained.
  • the expanded zone is first formed in the manner indicated above closest to the bottom 1, then the expanded zone the most distant from said bottom 1.
  • the formation of the elementary zones 10a, 10B, 10c ... 10n is carried out using a tool 20 which comprises at its periphery an expansion rod 21 of shape corresponding to said elementary zones 10a, 10b, 10c ... 10n.
  • the diameter of the expansion rod 21 is less than or equal to 4% of the initial diameter D of the peripheral skirt 2.
  • each elementary area 10a, 10b, 10c ... 10n is greater than or equal to 2/3 of the height h of the expansion rod 21, that is to say that the pitch d advancement of the expansion rod 21 to form each elementary zone 10a, 10b, 10c ... 10n is less than or equal to one third of the height h of said expansion rod 21.
  • each elementary zone 10a, 10b, 10c ... 10n is less than or equal to 1/6 of the height h of the expansion rod 21.
  • the expansion rod 21 may have a section in the form of a spherical cap, a circular section, a rectangular section or even a triangular section, this section being a function of the profile of the area. 2B expanded to obtain.
  • the material constituting the expansion rod 21 is an elastomer.
  • the tool 20 can be formed by juxtaposed and radially displaceable sectors to form, via the expansion rod 21, the elementary zones 10a, 10b, 10c ... 10n and the vertical stepwise movement of this tool 20 can be controlled for example by a jack 22 (Fig. 4).
  • the movements of the tool 20, that is to say the expansion and the advance step by step, can be controlled by judicious programming making it possible to produce an area 2B expanded according to the desired profile.
  • the box is held by a member 24 applied to the bottom 1 while the end of the peripheral skirt 2 opposite to said bottom 1 is free (Fig. 4 ).
  • a counter-form 25 is placed around the peripheral skirt 2.
  • This counter-form 25 is for example made of elastomer and in this case it is applied directly to the external face of the peripheral skirt 2 or of metal and in this in this case, it leaves a free space with the external face of the peripheral skirt to allow the expansion of the zone 2B.
  • the thickness of the wall of the peripheral skirt 2 at the center of the expanded zone 2B is equal to 0.12 mm.
  • the thickness of the wall of the peripheral skirt 2 in the center of the expanded zone 2B is equal to 0.14mm, that is to say 0.02mm more than if the expansion was carried out globally over the entire height of the zone 2B to expand.
  • the thickness of the wall of the peripheral skirt 2 in the center of the expanded zone 2B is equal to 0.136mm and the height of the box has decreased by 2mm compared to the height of the blank, which shows although there has been a supply of metal from the part of the peripheral skirt on the side of its free edge towards the zone undergoing expansion.
  • the manufacturing process for form boxes according to the invention therefore allows to form boxes with more marked curves and obtained from a metal blank in steel, or aluminum or aluminum alloy.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Forging (AREA)
  • Table Devices Or Equipment (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
EP96400484A 1995-03-21 1996-03-07 Herstellungsverfahren eines Metallbehälters in einer Form Expired - Lifetime EP0733414B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9503289A FR2731928B1 (fr) 1995-03-21 1995-03-21 Procede de fabrication d'une boite metallique de forme
FR9503289 1995-03-21

Publications (2)

Publication Number Publication Date
EP0733414A1 true EP0733414A1 (de) 1996-09-25
EP0733414B1 EP0733414B1 (de) 1999-10-06

Family

ID=9477254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96400484A Expired - Lifetime EP0733414B1 (de) 1995-03-21 1996-03-07 Herstellungsverfahren eines Metallbehälters in einer Form

Country Status (8)

Country Link
US (1) US5899105A (de)
EP (1) EP0733414B1 (de)
JP (1) JPH08257659A (de)
AT (1) ATE185295T1 (de)
CA (1) CA2172227A1 (de)
DE (1) DE69604520T2 (de)
ES (1) ES2138298T3 (de)
FR (1) FR2731928B1 (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0029459D0 (en) * 2000-12-04 2001-01-17 Corus Uk Ltd Metal container suitable to accommodate a heating or cooling component and method for manufacturing it
DE10261534A1 (de) * 2002-12-23 2004-07-15 Alexander Christ Spraydose
WO2005061149A2 (en) * 2003-12-22 2005-07-07 Glud & Marstrand A/S A method and an installation for forming a metal container and a metal container for storing of foodstuff
JP4616678B2 (ja) * 2005-03-25 2011-01-19 株式会社神戸製鋼所 包装容器およびその製造方法
US7726165B2 (en) * 2006-05-16 2010-06-01 Alcoa Inc. Manufacturing process to produce a necked container
US7934410B2 (en) * 2006-06-26 2011-05-03 Alcoa Inc. Expanding die and method of shaping containers
KR102101137B1 (ko) 2010-08-20 2020-04-14 알코아 유에스에이 코포레이션 성형 금속 용기 및 그 제작 방법
US9327338B2 (en) 2012-12-20 2016-05-03 Alcoa Inc. Knockout for use while necking a metal container, die system for necking a metal container and method of necking a metal container
AU2014317870B2 (en) * 2013-09-06 2018-02-15 Arconic Technologies Llc Aluminum alloy products and methods for producing same
CN105817512B (zh) * 2016-05-17 2017-10-03 安徽中鼎金亚汽车管件制造有限公司 一种油冷器金属管加工成型设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1645971A (en) * 1922-08-25 1927-10-18 Clarence H Riegel Method of making sheet-metal barrels
DE749792C (de) * 1935-09-17 1944-12-06 Verfahren zur Herstellung von ausgebauchten rohrfoermigen Koerpern, z.B. Metallfass-Maenteln
DE2432300A1 (de) * 1973-07-06 1975-01-23 Dunlop Ltd Verfahren zum pressverformen eines rohlings aus verformbarem material und formpresse
EP0356269A2 (de) * 1988-07-19 1990-02-28 C M B Packaging S.A. Verfahren und Vorrichtung zur Herstellung von Fassmänteln

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2194385A (en) * 1936-09-25 1940-03-19 Barringer Wallis & Manners Ltd Means for shaping tubes or containers
GB1075856A (en) * 1963-09-18 1967-07-12 Metal Containers Ltd An apparatus for forming a plurality of axially spaced beads in a hollow, substantially cylindrical sheet metal blank
US4331014A (en) * 1980-02-29 1982-05-25 Gulf & Western Manufacturing Company Can beading apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1645971A (en) * 1922-08-25 1927-10-18 Clarence H Riegel Method of making sheet-metal barrels
DE749792C (de) * 1935-09-17 1944-12-06 Verfahren zur Herstellung von ausgebauchten rohrfoermigen Koerpern, z.B. Metallfass-Maenteln
DE2432300A1 (de) * 1973-07-06 1975-01-23 Dunlop Ltd Verfahren zum pressverformen eines rohlings aus verformbarem material und formpresse
EP0356269A2 (de) * 1988-07-19 1990-02-28 C M B Packaging S.A. Verfahren und Vorrichtung zur Herstellung von Fassmänteln

Also Published As

Publication number Publication date
ES2138298T3 (es) 2000-01-01
FR2731928B1 (fr) 1997-06-13
FR2731928A1 (fr) 1996-09-27
EP0733414B1 (de) 1999-10-06
ATE185295T1 (de) 1999-10-15
DE69604520D1 (de) 1999-11-11
US5899105A (en) 1999-05-04
JPH08257659A (ja) 1996-10-08
DE69604520T2 (de) 2000-01-20
CA2172227A1 (fr) 1996-09-22

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