WO2005110642A1 - Procede et dispositif pour l'emboutissage profond d'ebauches metalliques, et articles a etagement ainsi fabriques, generalement coupes ou coques a extremites libres nettes - Google Patents

Procede et dispositif pour l'emboutissage profond d'ebauches metalliques, et articles a etagement ainsi fabriques, generalement coupes ou coques a extremites libres nettes Download PDF

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Publication number
WO2005110642A1
WO2005110642A1 PCT/EP2005/006049 EP2005006049W WO2005110642A1 WO 2005110642 A1 WO2005110642 A1 WO 2005110642A1 EP 2005006049 W EP2005006049 W EP 2005006049W WO 2005110642 A1 WO2005110642 A1 WO 2005110642A1
Authority
WO
WIPO (PCT)
Prior art keywords
stepped
typically
pressure sleeve
upper pressure
articles
Prior art date
Application number
PCT/EP2005/006049
Other languages
English (en)
Inventor
Jean-Marc Legresy
Original Assignee
Impress Group 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 Impress Group Bv filed Critical Impress Group Bv
Publication of WO2005110642A1 publication Critical patent/WO2005110642A1/fr

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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
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/44—Making closures, e.g. caps

Definitions

  • the invention relates to a method and an apparatus for drawing metal blanks to form articles, typically drawn bodies can bodies or cups, or shells for easy open can ends. It relates to a method and apparatus for the manufacturing of deep drawn shells used to make said easy open ends, with a removable can end panel for easy opening.
  • Metallic easy open can ends have a scoreline of reduced thickness surrounding said removable panel, and they are used to seal metallic can bodies typically by seaming.
  • Can bodies sealed with said easy open ends are adapted to withstand the temperature and pressure conditions developed during sterilisation.
  • Cups or shells are made as follows : a) planar sheet metal blanks are provided from a strip of metal or coil, typically steel coated with tin, or tin free steel, or aluminium, said strip of metal being preferably lacquered or laminated with a plastic film, said blanks being stamped from said strip or coil of metal, b) said blanks are drawn with a drawing tool to make frusto-conical cup or bodies having a recessed central panel and a peripheral flange, with a sloped skirt in between known as chuck wall. Said blanks may be drawn in one to three steps depending on the ratio H/L or D, H being the height of the end body, L or D being the largest dimension or diameter.
  • Easy open can ends are generally made as follows : a) planar sheet metal blanks are provided from a strip of metal or coil, typically steel coated with tin, or tin free steel, or aluminium, said strip of metal being preferably lacquered or laminated with a plastic film, said blanks being stamped from said strip or coil of metal, b) said blanks are drawn with a drawing press (or shell press) to make shells having a recessed central panel and a peripheral seam flange, with a sloped intermediate portion in between, c) a sealing compound is applied in the curved peripheral seam flange to ensure an airtight seal of the easy open end when seamed to the can, d) said shells are then provided with easy open means, a rivet being formed in the central panel, a scoreline being formed in said central panel to define a removable panel portion, a pull tab being secured to said rivet and optionally the central panel being beaded.
  • Said drawing press comprises basically blank holders (an upper blank holder and a lower blank holder) and a punch cooperating with die.
  • Standard easy open ends are converted from shells of comparatively low depth, i.e. of about 5 mm or less in depth.
  • Some ends require to form shells of about 15 mm in depth, i.e. with a higher drawing ratio.
  • Another purpose of the present invention is to get easy open ends being at the same time of high deepness and manufactured out of comparatively low gauge metal.
  • Another purpose of the present invention is to have easy open shells in which said sloped portion is a stepped portion with a ledge portion defining an upper sidewall portion and a lower sidewall portion, both sidewall portions being drawn without pleats or wrinkles.
  • a first object of the present invention is an apparatus for drawing metal blanks in order to make stepped articles, typically can bodies, cups or shells for easy open ends, said articles comprising a recessed central panel and a peripheral seam flange with typically a seaming panel and a lip, with, in between, a sloped stepped portion having at least one ledge and defining an internal profile, said ledge defining an upper sidewall portion and a lower sidewall portion, comprising : a) a cut edge able to cut said blanks from a metal strip, b) a pair of blank holders with an upper punch and a lower draw ring, c) a lower tool, typically in a fixed position, comprising a die core ring and a die core, said die core ring having a shaped profile with a flat portion and a sloped stepped part having typically said internal profile with at least one step, d) an upper tool, typically moving down axially to and from said lower tool, comprising a knock out or upper ring due to cooperate with said
  • the applicant has found that it was possible to reduce the gauge or thickness of the metal strip from which the blanks are cut. For instance, for shell making, it has been found possible to use a steel metal strip having a thickness of 0,16 mm, instead of a metal strip having a thickness of 0,20 mm, i.e. a 15 % reduction of the metal thickness and cost without any pleat form. Finally, the applicant has found that the power of the drawing press necessary to actuate its moving part to draw and form the blanks was significantly lower with the apparatus according to the invention, with respect to usual practices.
  • Figures la to 5f deal with the apparatus and the corresponding process for making stepped articles (9, 9', 9"). These figures are partial sectional views in a vertical plane comprising the axial direction (10) disclosing the position of the different parts of the drawing tools or apparatus (1) at different stages of the drawing process.
  • Figures la to Id deal with prior art apparatus and process.
  • Figures 2a to 5f deal with apparatus and processes according to the invention.
  • Figures la to 2f deal with an article (9, 9', 9") having one ledge (920).
  • the strip of metal (6) has been clamped by the blank holders (3).
  • the cutting ring or cut edge (2) has been actuated, and the blank cut (7), still maintained by the blank holders (3), has been put in contact with flat part (400) of die core ring (40), and started to be formed.
  • Figure 2c corresponds to figure lb.
  • Figure 2d and 2e are successive intermediate positions similar to the one of figure lc.
  • Figure 2f corresponds to figure 1 d.
  • the punch core (51) comprises two shoulders (510, 510'), and the lower tool (4) comprises a die core ring (40') with a lower pressure sleeve (43) forming a step (430).
  • Figures 3a to 3f deal with an article (9, 9', 9") having two ledges (920, 920').
  • said lower pressure sleeve (43) forms a step (430).
  • Figures 3a to 3f correspond to figures 2a to 2f.
  • the upper tool (5) comprises one upper pressure sleeve (52) and a small punch core (53), and lower die (4) comprises a die core ring (40) with a slopped stepped part (41) forming a step (410).
  • Figure 4a is similar to figures la, 2a, 3a.
  • Figure 4b is similar to figures 2b, 3b.
  • Figure 4c is similar to figure lb, 2c and 3c.
  • said upper pressure sleeve (52) is activated and acts as part of said upper tool (5) to form said blank, while small punch core (53) is not yet activated, said upper pressure sleeve (52) being stopped by the step (410) in figure 4e.
  • small punch core (53) is activated.
  • Figure 4g is similar to figures Id, 2f and 3f.
  • the upper tool (5) comprises two upper pressure sleeves, one outer upper pressure sleeve (52) and an inner upper pressure sleeve (52'), and a small punch core (53),
  • the lower die (4) comprises a die core ring (40') with a lower pressure sleeve (43) forming a step (430).
  • Figure 5 a corresponds to figure 4a.
  • Figure 5b corresponds to figure 4b.
  • Figure 5c corresponds to figure 4c.
  • the inner upper pressure sleeve (52') is activated and lowered to draw said blank up to the level of said step (430).
  • Figure 6 is a sectional view of the complete tooling of apparatus (1) corresponding to figures 4a to 4g.
  • Figure 7a is a partial sectional view of the stepped shell (9, 9'), with a depth H of 15 mm, having one ledge (920), manufactured with the process and apparatus of figures 4a to 4g according to the present invention.
  • Figure 7b is a photograph (lateral view) of a stepped shell (9, 9') manufactured with the process and apparatus of figures 4a to 4g.
  • Figure 7c is a photograph (lateral view) of a pleated stepped shell (9, 9') manufactured with the process and apparatus of figures 2a to 2f corresponding to the prior art.
  • Figure 8a similar to figure 7a, is a partial sectional view of a stepped shell (9, 9') having two ledges (920, 920') manufactured with the process and apparatus of figures 5a to 5f according to the present invention.
  • Figure 8b is a partial sectional view of a stepped can body (9, 9"), with a depth H of 45 mm, manufactured with the process and apparatus similar to the ones of figures 5a to 5f according to the present invention.
  • said punch core (51) may comprise as many upper pressure sleeves (52, 52') as steps (410, 410') so as to form as many ledges (920, 920') present in said slopped stepped portion or chuck wall portion (92).
  • said punch core (51) may comprise only one upper pressure sleeve (52), only one ledge (920) being present in said slopped stepped portion or chuck wall portion (92).
  • said punch core (51) may comprise two adjacent pressure sleeves, one outer pressure sleeve (52) and one inner pressure sleeve (52'), two ledges (920) and (920') being present in said slopped stepped portion or chuck wall portion (92).
  • Said actuating means may actuate said upper pressure sleeves (52, 52') until said upper pressure sleeves (52, 52') are stopped typically by step (410) of said lower die (4), each upper pressure sleeve (52) and (52') being stopped by its corresponding step (410) and (410').
  • said die ring (40, 40') may comprise at least one lower pressure sleeve (43) to form said step (410, 430) or to form a stop (431).
  • Another object of the invention is a method of making stepped articles (9), typically cans (9"), cups or shells (9') for easy open ends, said stepped articles (9) comprising a recessed central panel (90) and a peripheral seam flange (91), with a sloped stepped portion (92) in between, by drawing of metal blanks (7), with the apparatus (1) according to the present invention.
  • said metal strip (6) may be cut by said cutting ring or cut edge (2) to form said blank
  • said blank (7) may be clamped at its periphery by said pair of blank holders (3), with said upper punch holder (30) and said lower blank holder or drawing ring (31), c) then, said blank holders (3) may be moved down to put said blank (7) in contact with said flat part (401) of said die core ring (40), so as to form all or part of said lip (911) of said peripheral seam flange (91), d) then, the said upper pressure sleeve (52) and the small punch core (53) may be moved down until typically the upper pressure sleeve (52) is stopped by said step (410), or each of said upper pressure sleeves (52, 52'), if more than one upper pressure sleeve (52, 52') is present with an outer upper pressure sleeve (52) and an inner upper pressure sleeve (52'), is moved down in turn, the said outer upper pressure sleeve (52) being first actuated, until each said outer upper pressure sleeve (52)
  • Another object of the invention is a stepped article (9) made according to the process of the invention.
  • said lower sidewall (922) may have a slope going from 5° to 15°, preferably from 8° to 12°, and typically of 10°, angle relative to an axial direction (10).
  • stepped articles (9) may be made from a metal strip (6) chosen among steel coated with tin, or tin free steel, or aluminium, or alloys, said strip of metal being preferably lacquered or laminated or co-extruded with a plastic film, the thickness of said metal strip (6) being in range 0,13 mm - 0,22 mm, and preferably in the range 0,16 mm - 0,18 mm.
  • Another object of the invention is a stepped article according to the invention wherein said depth H is in the range 8 mm to 20 mm, and preferably in the range 12 to 18 mm, so as to form a stepped shell (9, 9') for an easy open end, said stepped shell (9, 9') having said peripheral seam flange (91) with said seaming panel (910) and said lip (911). See figures 7a to 8a.
  • Another object of the invention is a stepped article according to the invention wherein said depth H is in the range 20 mm to 70 mm, so as to form can bodies or cups (9, 9"). See figure 8b.
  • stepped articles (9) have been manufactured from a metal strip of 0,15 mm or 0,17 mm or 0,20 mm of thickness of lacquered tin free steel, using the type of apparatus of figure 6, with different tools - lower die (4) and upper punch (5), said apparatus being devised to measure the power required to draw the blanks (7).
  • Example 1 Stepped shells (9, 9') according to figure 7a have been manufactured with the process and apparatus disclosed in figures 4a to 4g, and 6.
  • Example 2 According to another embodiment, stepped shells (9, 9') according to figure 8a have been manufactured according to the process and apparatus disclosed in figures 5a to 5f.
  • Example 3 Stepped can bodies according to figure 8b have been manufactured according to the process and apparatus similar to the ones disclosed in figures 5a to 5f.
  • the apparatus and the process according to the invention allows for a high reduction in thickness of the strip of metal used, and as a consequence a very significant gain in the metal cost. Moreover, the process itself is less energy consuming.

Abstract

L'invention concerne un dispositif (1) qui comprend: a) un bord tranchant (2) découpant des ébauches (7) dans une bande métallique (6), b) une paire de porte-ébauches (3), un poinçon supérieur (30) et un anneau d'étirage inférieur (31), c) un outil inférieur (4), généralement en position fixe, comprenant un anneau central de filière (40) et un centre de poinçonnage (42), ledit anneau central de filière (40, 40') ayant un profil formé (400) et une partie étagée en pente (41) qui comprend au moins un étage (410), d) un outil supérieur (5) et un centre de poinçonnage (51), ainsi qu'un actionneur, sachant que le centre de poinçonnage (51) comporte au moins un manchon de pression supérieur (52, 52') capable de coopérer axialement avec l'étage en question (410) pour former le rebord considéré (920, 920'), et un centre de poinçonnage de «de petite taille» (53) capable de coopérer axialement avec la plaque de filière (42) visée. On décrit aussi un procédé d'élaboration d'articles à étagement, et l'avantage de l'invention est que les articles étagés emboutis ne présentent aucun pli.
PCT/EP2005/006049 2004-05-19 2005-05-17 Procede et dispositif pour l'emboutissage profond d'ebauches metalliques, et articles a etagement ainsi fabriques, generalement coupes ou coques a extremites libres nettes WO2005110642A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04356077A EP1598126A1 (fr) 2004-05-19 2004-05-19 Procédé et dispositif d'emboutissage d'ébauches métalliques et ébauches métalliques étagées obtenues par ledit procédé et dispositif, par exemple couvercles ou fermetures à ouverture facile
EP04356077.0 2004-05-19

Publications (1)

Publication Number Publication Date
WO2005110642A1 true WO2005110642A1 (fr) 2005-11-24

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PCT/EP2005/006049 WO2005110642A1 (fr) 2004-05-19 2005-05-17 Procede et dispositif pour l'emboutissage profond d'ebauches metalliques, et articles a etagement ainsi fabriques, generalement coupes ou coques a extremites libres nettes

Country Status (2)

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EP (1) EP1598126A1 (fr)
WO (1) WO2005110642A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016026116A (ja) * 2010-09-20 2016-02-12 コンテナー デベロプメント リミテッド 缶胴の形成方法および装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4587826A (en) * 1984-05-01 1986-05-13 Redicon Corporation Container end panel forming method and apparatus
GB2193140A (en) * 1986-07-28 1988-02-03 Redicon Corp Method and apparatus for forming container end panels
WO2002040193A2 (fr) * 2000-11-20 2002-05-23 Alfons Haar Inc. Extremites d'un generateur d'aerosol
WO2003004716A2 (fr) * 2001-07-03 2003-01-16 Container Development, Ltd. Enveloppe de canette et extremite de canette a sertissage double
EP1126939B1 (fr) * 1998-11-02 2004-02-11 Alfons Haar Inc. Procedes et appareil de formage d'une extremite de boite a bourrelets

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4587826A (en) * 1984-05-01 1986-05-13 Redicon Corporation Container end panel forming method and apparatus
GB2193140A (en) * 1986-07-28 1988-02-03 Redicon Corp Method and apparatus for forming container end panels
EP1126939B1 (fr) * 1998-11-02 2004-02-11 Alfons Haar Inc. Procedes et appareil de formage d'une extremite de boite a bourrelets
WO2002040193A2 (fr) * 2000-11-20 2002-05-23 Alfons Haar Inc. Extremites d'un generateur d'aerosol
WO2003004716A2 (fr) * 2001-07-03 2003-01-16 Container Development, Ltd. Enveloppe de canette et extremite de canette a sertissage double

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016026116A (ja) * 2010-09-20 2016-02-12 コンテナー デベロプメント リミテッド 缶胴の形成方法および装置

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