EP0448436A1 - Verfahren zum Herstellen hohler Gegenstände und metallischer pyramidenstumpförmiger Behältern und hohle Gegenstände und metallische Behältern pyramidstumpförmiger Form - Google Patents

Verfahren zum Herstellen hohler Gegenstände und metallischer pyramidenstumpförmiger Behältern und hohle Gegenstände und metallische Behältern pyramidstumpförmiger Form Download PDF

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Publication number
EP0448436A1
EP0448436A1 EP91400587A EP91400587A EP0448436A1 EP 0448436 A1 EP0448436 A1 EP 0448436A1 EP 91400587 A EP91400587 A EP 91400587A EP 91400587 A EP91400587 A EP 91400587A EP 0448436 A1 EP0448436 A1 EP 0448436A1
Authority
EP
European Patent Office
Prior art keywords
shape
rod
truncopyramidal
hollow
concavity
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Withdrawn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
EP91400587A
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English (en)
French (fr)
Inventor
Claude Corti
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.)
Ferembal SA
Original Assignee
Ferembal SA
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 Ferembal SA filed Critical Ferembal SA
Publication of EP0448436A1 publication Critical patent/EP0448436A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
    • B65D7/02—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by shape
    • B65D7/06—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by shape of polygonal cross-section, e.g. tins, boxes
    • 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
    • B21D51/2646—Of particular non cylindrical shape, e.g. conical, rectangular, polygonal, bulged

Definitions

  • the invention relates to metal containers of truncopyramidal shape, consisting of a hollow element and a bottom crimped on this element, in particular intended to contain paint.
  • the invention relates more particularly to a method of manufacturing a hollow metal element and a metal container, of truncopyramidal shape. It also relates to a hollow metal element as well as a metal container, of tronco-pyramidal shape.
  • the method can consist in cutting, from a metal sheet, metal sides of rectangular shape.
  • the cutting is carried out using two circular shears. This cutting process is the most economical because it optimizes both the use of the raw material (thin metal sheet) by reducing cutting waste as much as possible, the cost of cutting labor in optimizing the rates and the investment cost of the machine used.
  • the method then consists in welding the cylinder obtained by bringing two opposite sides of the rectangular flank, with a slight overlap and parallel to the axis of the cylinder thus formed.
  • at least one end of the cylinder is planked.
  • the planking is carried out by flaring so as to obtain a regular fallen edge.
  • This planking step makes it possible to prepare the crimping of the bottom which is carried out in a last step and makes it possible to obtain the tightness of this crimp.
  • a molding of the body of the container can optionally be produced.
  • the method consists in cutting a sidewall of rectangular shape and in carrying out its welding so as to obtain a cylindrical body.
  • the body is then formed by permanently deforming the cylindrical body, using an expansion tool acting along the axis of the cylinder and mounted on a suitable machine. This forming makes it possible to obtain a body of conical shape.
  • the stage of forming the cylindrical body makes it possible to deform the cylindrical body so as to give it a troncopyramidal shape but also causes a camber or a bending of the metal, in the plane of each of the four faces of the body in the form of a trunk of pyramid with two ends of it. This process therefore does not allow a regular edge to be obtained on the ends of the body. This entails risks of improper crimping of the bottom of the container and therefore risk of leakage when the container is filled.
  • this process has the advantage of making it possible to directly obtain a body of truncopyramidal shape having a regular edge on which a base can be crimped after the planking step.
  • this method has the disadvantage of causing improper use of the raw material. Indeed, cutting into a metal sheet metal flanks having a complex shape results in relatively large waste.
  • the object of the invention is to overcome these drawbacks by proposing a method of manufacturing hollow elements or containers of truncopyramidal shape, making it possible to optimize the use of the raw material as well as the number of operations required, in order to limit the cost price of this hollow element or of this container.
  • the end of said body of truncopyramidal shape near which said rod is made corresponds to that of the smallest cross section.
  • the invention also relates to a hollow metallic element of truncopyramidal shape consisting of a welded sheet of metal and comprising on its periphery and near one end, a rod whose concavity is directed towards the outside of said element, the depth of said concavity varying continuously between a maximum value on the short sides of said element and a minimum value substantially at the center of the long sides of said element.
  • the end of the element near which said rod is located is that having the smallest cross section.
  • the invention also relates to a metal container of truncopyramidal shape comprising a hollow metal element as just described and a bottom set on the end of this element comprising said rod.
  • the method according to the invention making it possible to obtain a hollow element of truncopyramidal shape, firstly consists in cutting, from a metal sheet, metal sides of rectangular shape.
  • the dimensions of the sidewalls are chosen as a function of those of the truncopyramidal element which it is desired to obtain.
  • the cutting is preferably carried out using two circular shears. This cutting process is, in the most economical.
  • the cylinder obtained is then welded by bringing two opposite sides of the rectangular flank, parallel to the axis of the cylinder thus formed.
  • the two opposite sides of the rectangular flank which are brought together have a slight overlap.
  • the cylindrical body obtained is then formed, by deforming it permanently using an expansion tool acting along the axis of the cylinder and mounted on a suitable machine.
  • the expansion tool is chosen so that the forming step makes it possible to obtain a body of truncopyramidal shape.
  • the truncopyramidal body obtained does not have a regular edge at any of its ends. Indeed, the forming step causes the metal to bend in the plane of each of the four faces of the body, at the two ends of the latter.
  • the method then consists in making a rod on the periphery of the body of truncopyramidal shape and near one of the two ends of this body.
  • the rod 13 is formed along a cross section of the element 12 of truncopyramidal shape.
  • the concavity of this rod is directed towards the outside of the element.
  • the depth of this concavity will be fixed as a function of the camber obtained during the operation of forming the body of cylindrical shape. To compensate for this camber, the depth of the concavity is not constant over the entire periphery of the element 12. It varies continuously between a maximum value on each of the two short sides 14, 15 of the truncopyramidal element up to a minimum value substantially in the middle of each of the two long sides 16, 17 of this element 12. The maximum and minimum values of the depth of the concavity as well as its variation will be determined for each element of given form.
  • the reference 1 designates a body of truncopyramidal shape, as obtained after the cutting, welding and forming operations.
  • the axis of this body is designated by reference 10.
  • the tool allowing the formation of the anti-cambering rod is designated by the reference 2. It comprises a first part 3 intended to be placed around the body 1 and a second part 4 intended to be placed opposite the first , inside the body 1.
  • these first and second parts 3 and 4 are made of four separate elements. The elements are mobile and are operated by appropriate means, known to those skilled in the art and not shown in the figure.
  • Each of the elements of the first part 3 has a substantially L-shaped shape corresponding to a quarter of the body 1, defined by its two axes of symmetry.
  • the height of each element is at least a fraction of that of the body 1.
  • the shape of the inner surface 6 of each element corresponds substantially to that of the outer surface of the body 1, so as to be able to match the shape of the latter. It is the same for the external surface 7 of each element of the second part 4 opposite the internal face of the body 1.
  • Each element of the first part 3 has, on its inner surface 6 a relief imprint 8, corresponding to the shape of the rod that it is desired to produce.
  • Each element of the second part 4 has, on its outer surface 7, a hollow imprint 9 corresponding to the relief imprint 8 of each element of the first part 3.
  • This tool is as follows.
  • the four symmetrical parts of the second part 4 are placed inside the box body, so as to place the hollow imprint 9 at the place where it is desired to make the rod.
  • Each element of the first part 3 is also placed around the body 1, so that the raised imprints 8 are located substantially opposite a hollow imprint 9 of an element of the corresponding second part 4.
  • Each element of the first part 3 is then pressed against the body 1, according to the arrows F1.
  • the body 1 is stamped by the imprint of the anti-cambering rod, corresponding to the imprints in relief 8 and in hollow 9. This operation stamping is more particularly illustrated by FIG. 3.
  • Figures 1 to 3 also illustrate the planking step which can then be carried out.
  • the tool allowing the formation of the anti-camber ring is supplemented by a third part 5.
  • This third part 5 also consists of four symmetrical and mobile elements. These four elements are operated by any appropriate means known to those skilled in the art.
  • the third part has a substantially parallelepiped shape whose cross section has a surface greater than that of the section located at the end of the box body near which the rod was formed. It also has over its entire periphery and over part of its height a recess 11.
  • Each element of this third part 5 is intended to be placed at least partially inside the body 1, as shown in Figure 1.
  • the third part 5 is positioned so that the end, here lower, of the body 1, near which the rod will be or is made, rests on the horizontal part of the recess 11. After the formation of the rod, we act on each element of the third part 5 so as to move them in the direction and direction indicated by the arrow F3. As illustrated in FIG. 3, this operation makes it possible to flare, towards the outside of the body 1, the lower end of the latter and to make the planking of the lower end of this edge.
  • the method of manufacturing the metal container of truncopyramidal shape according to the invention consists in producing an element of troncopyramidal shape according to the process which has just been described, this element having dimensions corresponding to those of the container that it is desired to obtain.
  • a flanging planking is then carried out at the end of the element close to which the anti-cambering rod has been produced.
  • the planking is carried out by any suitable means, known to those skilled in the art, which will not be described here in detail.
  • the planking can in particular be carried out by means of the tool described with reference to FIGS. 1 to 3.
  • the second step of the process consists in crimping a base 19 on the end of the previously bordered element.
  • the edge of the truncopyramidal element used is regular, a good quality crimping is obtained, the risks of leakage being thus avoided.
  • FIG. 5 illustrates a container 18 obtained by the method which has just been described.
  • This container comprises, near the bottom 19, an anti-camber ring 13.
  • This container can also include a rod 20, at least in the corners, to allow easy separation of the previously stacked containers.
  • a cover 21 and a handle 22 can also be provided.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
EP91400587A 1990-03-14 1991-03-04 Verfahren zum Herstellen hohler Gegenstände und metallischer pyramidenstumpförmiger Behältern und hohle Gegenstände und metallische Behältern pyramidstumpförmiger Form Withdrawn EP0448436A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9003282 1990-03-14
FR9003282A FR2659579B1 (fr) 1990-03-14 1990-03-14 Procede de fabrication d'element creux et de recipient metalliques de forme troncopyramidale et element creux et recipient metalliques de forme troncopyramidale.

Publications (1)

Publication Number Publication Date
EP0448436A1 true EP0448436A1 (de) 1991-09-25

Family

ID=9394738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91400587A Withdrawn EP0448436A1 (de) 1990-03-14 1991-03-04 Verfahren zum Herstellen hohler Gegenstände und metallischer pyramidenstumpförmiger Behältern und hohle Gegenstände und metallische Behältern pyramidstumpförmiger Form

Country Status (3)

Country Link
EP (1) EP0448436A1 (de)
ES (1) ES2039338T1 (de)
FR (1) FR2659579B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0644123A3 (en) * 1993-09-09 1995-04-12 Jose Rodriguez Campillo Anti-bending corrugated system for metallic containers.
EP0725009A1 (de) * 1995-02-03 1996-08-07 Safet Embamet Verfahren zum Herstellen einer metallischen Verpackung mit allgemeiner prismatischer Form und mit diesem Verfahren hergestellte Verpackung
WO1997014619A1 (en) * 1995-10-16 1997-04-24 S.I.L.F.A. S.R.L. Societa' Imballagi Latta Fusti Acciaio Metal container provided with circular base and square opening

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19536543A1 (de) * 1995-09-29 1997-04-10 Schmalbach Lubeca Behälterkörper mit zwei Schultern

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3172386A (en) * 1962-12-28 1965-03-09 American Can Co Can manufacturing method
FR2083520A1 (de) * 1970-03-23 1971-12-17 Huber Karl
FR2430892A1 (fr) * 1978-07-13 1980-02-08 Monfalconesi E Passero Off Recipient metallique cylindrique ou conique, procede et dispositif pour sa fabrication
GB2075462A (en) * 1980-04-30 1981-11-18 Plm Ab Sheet-meal Container
GB2097747A (en) * 1981-05-01 1982-11-10 Right Hand Man Ltd Rimmed containers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3172386A (en) * 1962-12-28 1965-03-09 American Can Co Can manufacturing method
FR2083520A1 (de) * 1970-03-23 1971-12-17 Huber Karl
FR2430892A1 (fr) * 1978-07-13 1980-02-08 Monfalconesi E Passero Off Recipient metallique cylindrique ou conique, procede et dispositif pour sa fabrication
GB2075462A (en) * 1980-04-30 1981-11-18 Plm Ab Sheet-meal Container
GB2097747A (en) * 1981-05-01 1982-11-10 Right Hand Man Ltd Rimmed containers

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0644123A3 (en) * 1993-09-09 1995-04-12 Jose Rodriguez Campillo Anti-bending corrugated system for metallic containers.
EP0725009A1 (de) * 1995-02-03 1996-08-07 Safet Embamet Verfahren zum Herstellen einer metallischen Verpackung mit allgemeiner prismatischer Form und mit diesem Verfahren hergestellte Verpackung
FR2730213A1 (fr) * 1995-02-03 1996-08-09 Safet Embamet Procede de fabrication d'un emballage metallique de forme generale prismatique et emballage obtenu par ce procede
US5813565A (en) * 1995-02-03 1998-09-29 Safet Embamet Process for the production of metallic packaging of generally prismatic shape and packaging obtained by this process
WO1997014619A1 (en) * 1995-10-16 1997-04-24 S.I.L.F.A. S.R.L. Societa' Imballagi Latta Fusti Acciaio Metal container provided with circular base and square opening

Also Published As

Publication number Publication date
FR2659579B1 (fr) 1993-08-06
FR2659579A1 (fr) 1991-09-20
ES2039338T1 (es) 1993-10-01

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