EP0433203B1 - Verfahren und Vorrichtung zum Tiefziehen von konischen Behältern und nach diesem Verfahren hergestellter Behälter - Google Patents

Verfahren und Vorrichtung zum Tiefziehen von konischen Behältern und nach diesem Verfahren hergestellter Behälter Download PDF

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Publication number
EP0433203B1
EP0433203B1 EP90470068A EP90470068A EP0433203B1 EP 0433203 B1 EP0433203 B1 EP 0433203B1 EP 90470068 A EP90470068 A EP 90470068A EP 90470068 A EP90470068 A EP 90470068A EP 0433203 B1 EP0433203 B1 EP 0433203B1
Authority
EP
European Patent Office
Prior art keywords
punch
blank
stamping
annular
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.)
Expired - Lifetime
Application number
EP90470068A
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English (en)
French (fr)
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EP0433203A1 (de
Inventor
Jean-François Seconde
Gérard Heurteboust
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
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Filing date
Publication date
Application filed by Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Priority to AT90470068T priority Critical patent/ATE104180T1/de
Publication of EP0433203A1 publication Critical patent/EP0433203A1/de
Application granted granted Critical
Publication of EP0433203B1 publication Critical patent/EP0433203B1/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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • 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
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • 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
    • B21D51/02—Making hollow objects characterised by the structure of the objects
    • B21D51/10—Making hollow objects characterised by the structure of the objects conically or cylindrically shaped objects

Definitions

  • the invention relates to the manufacture of containers of generally frustoconical shape, by stamping a sheet metal blank, in particular of steel and of small thickness. It relates more particularly to the manufacture of containers with a high taper, that is to say the side wall of which is largely flared on the side of the opening of the container.
  • the free strand is the annular area of the blank located between the punch and the die, which is neither in contact with the punch nor in contact with the die during stamping, that is to say , in the case of punch and frustoconical matrix and just before the end of the drawing, practically the entire side wall of the container.
  • this method has the drawback of greatly limiting, from the start of stamping, the flow of the metal constituting the blank between the die and the outer ring of the punch. Therefore, the subsequent deformations caused by the other decreasing diameter rings cause a significant stretching of the metal in the central area of the blank, which can lead to its rupture, especially in the case of a thin blank. In addition, tearing can occur by significant friction of the deformed area of the blank between the die and the outer ring of the punch.
  • the object of the present invention is to remedy these problems and to allow the manufacture of containers of generally frustoconical shape by stamping sheet blanks of thin or very thin thickness, in particular of steel.
  • the present invention relates to a method of stamping a sheet blank for the manufacture in one pass of a container of generally frustoconical shape, according to which a stamping tool is used.
  • a stamping tool comprising a male frustoconical force punch and a matrix facing it
  • the expression frustoconical shape to be understood as relating not only to containers of circular cross-section, but also to containers of cross-section of generally polygonal shape, and of which the cross-section in a plane passing through the center of the container can be generally rectilinear or curvilinear with more or less pronounced concavity or convexity.
  • this method is characterized in that the matrix comprises, facing the frustoconical surface of the punch, concentric rings movable perpendicular to the plane of the blank, the concentric annular zones of the blank are deformed successively, starting with that of smaller dimension, each annular zone, of frustoconical shape after deformation, being kept pressed towards the punch by a corresponding ring from the moment when said zone is in contact with the punch and until the end of the stamping, each annular zone being by elsewhere by pressing on a corresponding ring as long as the adjacent internal annular zone is not applied to the punch.
  • the invention it is possible to manufacture, by stamping in a single pass, containers of frustoconical shape from sheet metal of small thickness, practically without risk of breakage of the blank. Indeed, the deformation of the blank occurring first in its central part, close to the bottom of the container, the subsequent successive deformations of the zones of increasing diameter practically do not occur on the already deformed metal of the zones of smaller dimensions, and n therefore do not tend to stretch it excessively, thus avoiding the ruptures which commonly occur as close as possible to the nose of the punch in the procedures according to the prior art.
  • the metal necessary to absorb these deformations is freely, subject to the pressure exerted by the blank holder, brought from the peripheral areas of the blank. It is thus possible to easily control the deformations by stretching the metal by adapting the pressures exerted on the blank drawn by the different rings of the matrix and by the blank holder.
  • each annular zone is maintained substantially in the plane of the blank as long as the adjacent internal annular zone is not applied to the punch.
  • This particular arrangement makes it possible, in addition to permanently containing the free strand by contact of the blank on the annular rings of the die, to keep firmly pressed between punch and die each stamped annular zone before the adjacent zone towards the outside begins. to be deformed by the action of the punch and the corresponding die ring. The influence of the deformation of an annular zone on the adjacent zones towards the interior is then further reduced.
  • the rings can also move slightly, accompanying the area of the blank in free strand, under the effect of less pressure exerted on said rings, this pressure being adapted to the buckling characteristics of the material constituting the blank. It can also be assumed that, during stamping, an annular area of the blank is not fully pressed by the corresponding ring on the punch when the adjacent external annular area begins to be deformed. Even in this case, during stamping, the blank area in free strand gradually decreases, which has the effect of reducing the risks of wrinkling.
  • the punch has on its conical surface one or more circumferential recesses, and corresponding steps are formed on the wall of the container during stamping between two adjacent annular zones of said wall, successively when brought into contact. an annular zone on the punch by the corresponding ring.
  • This arrangement makes it possible to produce a container having on its conical side wall steps which, in addition to their aesthetic appearance, constitute reinforcements of the wall.
  • the formation of these steps creates at the end of the deformation of each annular zone an additional tension of the metal in said annular zone, which participates in the elimination of any wrinkling.
  • the invention also relates to a stamping device for the implementation of the method described above, comprising a punch of generally frustoconical male shape facing a matrix and a blank holder to retain the periphery of the blank while letting it slide, this device being characterized in that the matrix comprises, opposite the frustoconical surface of the punch, concentric rings movable in the direction of movement of the punch, and pressure means for exerting on each of said rings a predetermined force enough to deforming, during stamping, the corresponding annular zone of the blank in the direction of the punch, each of the front annular surfaces of said rings having a shape complementary to the annular surface of the punch which faces it axially, for, at the end of stamping, press each annular area against the punch.
  • the stamping tool shown in the different figures comprises a die 1, a frustoconical punch 2 and a blank holder 3.
  • the die 1 is linked in a manner known per se to an upper plate 4 of a stamping press.
  • the punch is linked to a lower plate 5 of said press.
  • the blank holder 3 is slidably mounted on the lower plate 5, means not shown being provided for exerting pressure on the blank holder 3 in the direction of the die 1.
  • one cutting ring 6, intended in particular to perform at the end of stamping the peripheral cutting of the edge of the container.
  • the die 1 comprises a fixed ring 7 rigidly fixed to the upper plate 4 of the press, and several concentric rings 8, 9, 10, three in the example shown.
  • the central ring 10 is, in this example, a disc, the face 11 of which faces the punch comprises a flat central zone 12 surrounded by a frustoconical zone 13, this central ring 10 being intended to form the bottom of the container and the part of the side wall thereof adjacent to said bottom.
  • this disc could be replaced by an annular ring having a conical surface identical to the surface 13, and a central counter-punch provided for forming, in collaboration with the central part of the punch, the bottom of the container. .
  • the surface of the central zone 12 or of the counter-punch could also be shaped so as to give the bottom of the box a particular relief.
  • the concentric rings 8, 9, 10 are slidably mounted relative to each other, and permanently pushed towards the punch by pressure means such as springs 14, 15, 16. These rings, including the maximum clearance is determined as a function of the stamping depth, are moreover retained by stops 17, 18, 19 limiting their displacement in the direction of the punch, so that the lower ends of these rings are all substantially in the same plane before the stamping.
  • said springs are determined for each ring so as to be able to exert sufficient force on the stamped blank to press the annular area of the blank on the punch which is found during stamping opposite said ring.
  • Each ring has a frustoconical surface 20, 21, 13 of the same conicity as the annular surfaces 20 ', 21', 13 'of the punch located respectively opposite.
  • the external sliding ring 8 that is to say the one having the largest diameter, furthermore comprises a substantially planar surface 22, adjacent to its frustoconical surface 20, situated opposite a surface 22 'of the cutting ring 6, and preferably comprising a protrusion or annular ring 23.
  • An annular cup 23 'of corresponding profile is produced in the cutting ring 6.
  • Said ring 23 and said cup 23' are in particular intended to form on the edge of the container a peripheral rib constituting a heat-sealing track for the subsequent welding of a closure cap for the container. This arrangement also ensures flatness, at the end of stamping, of said heat-sealing track, which guarantees the continuity and therefore the seal, of the weld when the container is closed.
  • the conical annular surfaces 20 ′, 21 ′, 13 ′ of the punch are also connected by recesses 24, 25, which form, with said annular surfaces, circumferential steps, said recesses being located opposite the guide surfaces between the rings of the matrix.
  • the blank 30 is placed between the die and the punch spaced apart from each other, the blank resting on the blank holder 3 and the cutting ring 6, maintained in the high position by the pressurizing means of the blank holder.
  • the sliding rings 8, 9 and 10 are pushed down by the springs 14, 15, 16, the lower ends of these rings and of the fixed ring 7 of the matrix being substantially in the same horizontal plane.
  • the upper plate 4 of the press is then pushed down, until the fixed ring 7 of the die comes into contact with the blank and presses it against the blank holder 3.
  • the rod 23 associated with the bowl 23 ′ thus participates, in addition to the pressure exerted by the blank holder, in retaining the periphery of the blank, by folding and successive unfolding of this, during the sliding of the blank between the outer ring and the cutting ring, during the following phases of the stamping.
  • the upper plate 4 continuing to be pushed down, the blank then begins to be stamped in its central part by the interaction of the central ring 10 with the punch 2.
  • the periphery of the blank has slid radially between the fixed ring 7 of the matrix and the blank holder 3, and between the outer ring 8 and the cutting ring 6, the rod 23 participating in the regularity of this sliding over the entire periphery of the blank.
  • the blank continues to be deformed, the remaining free strand being supported by the lower end of the sliding ring 9 adjacent to the central ring 10.
  • the force exerted by the springs 15 on this ring 9, hereinafter called the middle ring is sufficient to avoid its retraction from the outer ring 8, the free strand of the blank then remaining in the original horizontal plane of the blank.
  • a certain retreat from this middle ring can however be accepted insofar as, despite this decline, the deformation of the free strand remains contained by the pressure exerted by the lower end of said middle ring.
  • the fifth phase is carried out in a similar manner to the fourth phase, by continuing the descent of the upper plate 4, the continued penetration of the punch into the matrix causing the sliding of the middle ring 9 in the outer ring 8.
  • the annular zone conical 34 of larger diameter is then deformed then clamped between the conical surface 20 of the outer ring 8 and the corresponding surface 20 'of the punch, as shown in Figure 1 e , the step 36 then being formed similarly to the step 35.
  • This sixth phase is a phase of cutting the periphery of the container, this cutting being carried out, during the final penetration of the punch into the die, by the cutting ring 6 which, being in abutment on the lower plate 5, moves, relative to the fixed ring 7 of the die, simultaneously with the punch, and, in cooperation with this fixed ring 7, shears the edge 37 of the blank.
  • the forming of the steps 35, 36 makes it possible to create an additional tension of the metal of the blank which participates in the elimination of any remaining folds.
  • the steps are formed successively, at the end of the fourth and of the fifth stamping phase. It will easily be understood that the same effect would be obtained if all the steps were formed simultaneously at the end of stamping. This could result from the fact that, voluntarily or not, the pressure exerted on a ring, for example the middle ring 9, was insufficient to form the corresponding step. In this case, moreover, the annular zone 33 of the blank would not be completely pressed between the punch and the ring 9 at the end of the fourth phase. However, it would be held against the punch near the recess 25 during the fourth phase, and near the recess 24 during the fifth phase.
  • Figures 2, 3 and 4 show in the end of stamping position different variants of the device, each intended for stamping plates of different shapes.
  • the steps 35 ′, 36 ′ instead of being formed by cylindrical recesses such as those described above, are formed by planar recesses in parallel planes. It will be readily understood that the lower ends of the sliding rings are adapted accordingly, and that the method will be carried out in a similar manner to that which has been described above.
  • the shape of the container wall is not limited to the various configurations shown only by way of example.
  • the invention also applies to the manufacture of containers of non-circular horizontal section, the shape of the punch and of the various sliding rings being adapted accordingly.
  • the method and the device according to the invention are particularly suitable for stamping blanks of thin steel sheet, in particular less than 0.2 mm and with high mechanical characteristics (Re> 450 MPa), but can of course be used for stamping thicker or different metal sheets. They allow in particular the manufacture of containers of various shapes, the slope of the walls, the depth of the container, and its dimensions which can vary widely, the shape of the tools and in particular the number of rings being adapted accordingly.

Claims (11)

  1. Verfahren zum Tiefziehen einer Blechscheibe (30) zur Herstellung eines im allgemeinen konischen Behälters in einem Arbeitsgang, bei dem ein Tiefziehwerkzeug verwendet wird, das einen hervorstehenden konischen Stempel (2) und eine ihm gegenüberliegende Form (1) aufweist, dadurch gekennzeichnet, daß die Form konzentrische, der konischen Oberfläche des Stempels gegenüberliegende und in senkrechter Richtung zur Ebene der Blechscheibe bewegliche Ringe (8, 9, 10) aufweist, daß nacheinander ringförmige konzentrische Bereiche (32, 33, 34) der Scheibe verformt werden, wobei mit derjenigen mit den kleinsten Abmessungen begonnen wird, daß jeder ringförmige Bereich (32, 33, 34) durch einen zugehörigen Ring (10, 9, 8) unter Druck am Stempel anliegt, ab dem Zeitpunkt, zu dem der Bereich mit dem Stempel in Berührung steht und bis zum Ende des Tiefziehvorgangs und daß sich jeder ringförmige Bereich außerdem auf einem zugehörigen Ring abstützt, solange der ringförmige benachbarte Bereich nicht an dem Stempel anliegt.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß jeder ringförmige Bereich (32, 33, 34) im wesentlichen in der Ebene der Scheibe (30) gehalten wird, solange der benachbarte innere ringförmige Bereich nicht am Stempel (2) anliegt.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Stempel (2) auf seiner konischen Oberfläche einen oder mehrere umlaufende Absätze (24, 25) aufweist und daß entsprechende Stufen (35, 36) auf der Wand des Behälters während des Tiefziehvorgangs zwischen zwei benachbarten ringförmigen Bereichen (32, 33, 34) des Behälters ausgebildet werden, nacheinander während des Anliegens eines ringförmigen Bereiches am Stempel (2) durch den zugehörigen Ring (10, 9, 8).
  4. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Stempel (2) auf seiner konischen Oberfläche umlaufende Absätze (24, 25) aufweist und daß entsprechende Stufen (35, 36) gleichzeitig am Ende des Tiefziehvorgangs auf der Behälterwand ausgebildet werden.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß entlang eines ebenen Umfangsbereichs der Scheibe, welcher den Rand des tiefgezogenen Behälters bildet, eine Umfangsrippe (31) ausgebildet wird.
  6. Tiefziehvorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 5, mit einem im allgemeinen konischen hervorstehenden Stempel (2), der einer Form (1) und einer Scheiben-Klemmvorrichtung (3) gegenüberliegt, um den Rand der Scheibe zu halten, ihn jedoch zugleich gleiten zu lassen, dadurch gekennzeichnet, daß die Form gegenüber der konischen Oberfläche des Stempels konzentrische in Verschieberichtung des Stempels bewegliche Ringe (8, 9, 10) aufweist sowie eine Druckanordnung (14, 15, 16), um auf jeden der Ringe eine vorgegebene Kraft auszuüben, die ausreicht während des Tiefziehvorgangs den ringförmigen zugehörigen Bereich der Scheibe in Richtung des Stempels zu verformen, wobei jede der ringförmigen vorderen Oberflächen (20', 21', 13) der Ringe eine an die ringförmige Oberfläche (20', 21', 13') des ihnen gegenüberliegenden Stempels angepaßte Form aufweist, um am Ende des Tiefziehvorgangs jeden ringförmigen Bereich gegen den Stempel zu drücken.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Ringe (8, 9, 10) durch Anschläge (17, 18, 19) zurückgehalten werden, welche ihre Verschiebung in Richtung des Stempels (2) begrenzen.
  8. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die dem Stempel (2) gegenüberliegenden Enden der Ringe (8, 9, 10) alle im wesentlichen in der gleichen vorderen Tiefziehebene liegen.
  9. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß sie zwischen der Scheiben-Klemmanordnung (3) und dem Stempel (2) einen Ring (6) aufweist, in dem in seiner der Form zugewandten Fläche eine ringförmige Vertiefung (23') vorgesehen ist und daß ein gleitender Ring (8) der Form, der dem Ring (6) gegenüberliegt, einen Vorsprung (23) aufweist, dessen Profil an dasjenige der ringförmigen Vertiefung (23') angepaßt ist.
  10. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Druckanordnung elastische Bauteile, wie z.B. Federn (14, 15, 16) aufweist.
  11. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Druckanordnung für jeden Ring (8, 9, 10) derart ausgelegt ist, daß auf die während des Tiefziehvorgangs verformte Scheibe eine Kraft ausgeübt wird, die ausreicht, um den ringförmigen Bereich (32, 33, 44) der Scheibe (30) auf den Stempel (2) zu drücken.
EP90470068A 1989-12-11 1990-12-05 Verfahren und Vorrichtung zum Tiefziehen von konischen Behältern und nach diesem Verfahren hergestellter Behälter Expired - Lifetime EP0433203B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90470068T ATE104180T1 (de) 1989-12-11 1990-12-05 Verfahren und vorrichtung zum tiefziehen von konischen behaeltern und nach diesem verfahren hergestellter behaelter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8916445A FR2655576B1 (fr) 1989-12-11 1989-12-11 Procede et dispositif d'emboutissage de recipients de forme tronconique, et repipient ainsi embouti.
FR8916445 1989-12-11

Publications (2)

Publication Number Publication Date
EP0433203A1 EP0433203A1 (de) 1991-06-19
EP0433203B1 true EP0433203B1 (de) 1994-04-13

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EP90470068A Expired - Lifetime EP0433203B1 (de) 1989-12-11 1990-12-05 Verfahren und Vorrichtung zum Tiefziehen von konischen Behältern und nach diesem Verfahren hergestellter Behälter

Country Status (7)

Country Link
EP (1) EP0433203B1 (de)
JP (1) JP2834334B2 (de)
KR (1) KR100191341B1 (de)
AT (1) ATE104180T1 (de)
CA (1) CA2031859C (de)
DE (1) DE69008134D1 (de)
FR (1) FR2655576B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19853130B4 (de) * 1998-11-18 2005-07-14 Daimlerchrysler Ag Verfahren und Einrichtung zum Tiefziehen von Blechteilen
JP2006035225A (ja) * 2004-07-22 2006-02-09 Jfe Steel Kk 傾斜側壁部を持つ金属製容器の成形方法
JP6528701B2 (ja) * 2015-06-08 2019-06-12 株式会社デンソー 製造方法
WO2023245002A1 (en) * 2022-06-16 2023-12-21 Zume, Inc. Systems and methods for screens for fiber part forming molds

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1453652A (en) * 1923-05-01 Method and apparatus por eobmiiia sheet-metal articles
US1551832A (en) * 1923-04-18 1925-09-01 Timken Roller Bearing Co Die
US2312749A (en) * 1940-08-03 1943-03-02 Giles E Bullock Method of making thin sheet metal shells
US3302441A (en) * 1963-07-09 1967-02-07 Continental Can Co Die for deep drawn tapered container
DE1452963A1 (de) * 1964-03-07 1969-04-30 Dro Engineering Co Di Druckkolbenpresse zur Durchfuehrung mehrerer Arbeitsgaenge bei einem Arbeitshub
JPH02179325A (ja) * 1988-12-29 1990-07-12 Enami Seiki:Kk 絞り成形機

Also Published As

Publication number Publication date
EP0433203A1 (de) 1991-06-19
CA2031859C (fr) 2003-06-17
FR2655576B1 (fr) 1995-01-06
ATE104180T1 (de) 1994-04-15
DE69008134D1 (de) 1994-05-19
KR910011355A (ko) 1991-08-07
JP2834334B2 (ja) 1998-12-09
CA2031859A1 (fr) 1991-06-12
FR2655576A1 (fr) 1991-06-14
JPH04118122A (ja) 1992-04-20
KR100191341B1 (ko) 1999-06-15

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