EP0017434B1 - Réceptacles en forme de boîte et procédé et dispositif pour leur fabrication - Google Patents

Réceptacles en forme de boîte et procédé et dispositif pour leur fabrication Download PDF

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Publication number
EP0017434B1
EP0017434B1 EP80300961A EP80300961A EP0017434B1 EP 0017434 B1 EP0017434 B1 EP 0017434B1 EP 80300961 A EP80300961 A EP 80300961A EP 80300961 A EP80300961 A EP 80300961A EP 0017434 B1 EP0017434 B1 EP 0017434B1
Authority
EP
European Patent Office
Prior art keywords
wall
cylindrical wall
bead
ironing
rim
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
Application number
EP80300961A
Other languages
German (de)
English (en)
Other versions
EP0017434A1 (fr
Inventor
Richard Mccormick Mckie
Edward Anthony Vardy
Michael Winterton
Michael Haskew
Frank Price
Geoffrey Whetton
Philip Rhodes
John Alan Cook
John Keith Warren
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.)
Impress Sutton Ltd
Original Assignee
Mardon Illingworth Ltd
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
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Application filed by Mardon Illingworth Ltd filed Critical Mardon Illingworth Ltd
Publication of EP0017434A1 publication Critical patent/EP0017434A1/fr
Application granted granted Critical
Publication of EP0017434B1 publication Critical patent/EP0017434B1/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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/28—Deep-drawing of cylindrical articles using consecutive dies
    • 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
    • B21D22/30—Deep-drawing to finish articles formed by deep-drawing

Definitions

  • This invention relates to a cup-shaped container, a method of making such a container and apparatus for carrying out the method.
  • Cup-shaped containers made of metal are commonly used to make cans for containing and storing foods and liquids.
  • a two-piece can sometimes referred to as a "seamless" can, wherein the body and these base are integrally formed by drawing and wall-ironing from a blank of metal, to form a one-piece cup-shaped container, which is trimmed at the rim and finally capped after filling. It is usual for such a cup-shaped container to be made in three operations. A shallow cup-shaped blank is formed in a first operation from a flat blank. This shaped blank is then subjected to drawing and wall-ironing and the third operation is cutting off the rim margin with a knife to form a cup-shaped container of standard length.
  • Such cans have the advantages that leakage and consequent food contamination are less likely to occur, since seams are considerably reduced as compared with the traditional can.
  • the two-piece cans are more aesthetically pleasing to the eye and are easier to stack end to end.
  • a problem that arises in the manufacture of the one-piece cup-shaped containers is that longitudinal splits occasionally develop in the cylindrical wall of the container. Such splits, if not detected, may result in a can which is liable to leakage and contamination of the contents. Variation occurs in quality of the metal used for making cans and this problem manifests itself particularly with poorer quality metal.
  • the present invention is not concerned with this problem of providing sufficient strength for flanging, but is concerned with preventing splitting, without the necessity for increasing the thickness of the can wall.
  • the present invention provides a method of manufacturing a one-piece cup-shaped container, comprising wall-ironing a pre-shaped blank having a base and cylindrical wall, so as to extend the length of the cylindrical wall, characterised by forming an inner circumferential bead on the cylindrical wall towards the end of the wall-ironing operation, and trimming the rim of the cylindrical wall near the bead, the bead having an axial extent of 0.7 to 1.5 mm.
  • the forming of the bead is preferably effected by the wall-ironing step causing material of the cylindrical wall to flow into a groove around the mandrel.
  • the invention also resides in wall-ironing apparatus for use in manufacturing a one-piece, cup-shaped, metal container from a pre-shaped blank having a base and a cylindrical wall, the apparatus comprising a mandrel insertable within the cylindrical wall and an annular wall-ironing die for ironing the cylindrical wall along the mandrel to extend the length of the cylindrical wall, characterised in that a circumferential groove is provided around the mandrel near the rim-forming portion of the mandrel, whereby an integral inner circumferential bead is formed on the cylindrical wall near the rim by relative movement of the mandrel and the ironing die, the groove being dimensioned so as to provide a bead whose axial extent is 0.7 to 1.5 mm.
  • the invention also resides in a one-piece metal, cup-shaped container having a base and an integral elongate cylindrical wall, in which the cylindrical wall has been extended by wall-ironing and trimmed to provide a container of predetermined length, characterised in that the cylindrical wall has an integral inner circumferential bead formed near the rim and having an axial extent of 0.7 to 1.5 mm.
  • the apparatus shown in Figures is for manufacture of a one-piece, cup-shaped, steel container suitable for making a can.
  • the container 10, as shown in Figure 1 e and 3 comprises a base 11 and an integral cylindrical wall 12.
  • the container is further processed to form an outstanding flange at the rim and, afterfilling, a lid is sealed to the rim.
  • the container is made from a dish-shaped blank 13, as shown in Figures 1 a, and 3, which is preformed by a drawing step from a flat blank of low-carbon, cold rolled, tin-coated steel in known manner.
  • This blank has a base 14 and a shallow cylindrical wall 15.
  • the apparatus carries out a series of forming steps in rapid succession to form a container 10.
  • the apparatus comprises a body 20 (Figure 3), which mounts in fixed, spaced locations, a drawing die 21, a first wall-ironing die 22, a second wall-ironing die 23 and an impression die 24 ( Figure 1 a).
  • the drawing die 21 is annular and formed with an inner circumferential radiussed rebate 25, which snugly receives the base 14 of a blank 13, as shown in Figure 1a.
  • the drawing die 21 is supported by an outer ring 26 of complementary form.
  • the first wall-ironing die 22 is annular and has a frusto-conical inner surface 28 leading to a cylindrical, inner surface 29 of slightly smaller diameter than that of the drawing die 21.
  • the die 22 is supported by an outer ring 30.
  • the second wall-ironing die 23 is similarly annular and has a frusto-conical inner surface 31 leading to a cylindrical, inner surface 32 of slightly smaller diameter than that of the first wall-ironing die 22.
  • the die 23 is supported by an outer ring 33.
  • the impression die is a block held in a recess in a cup 34 and formed with circular depressions 35.
  • the cup 34 is slidable in a housing 37 under pneumatic pressure.
  • the rings 26, 30, 33 and the housing 37 are fixed in the body 20 ( Figure 3) which has an inlet 40 for blanks 13 and an outlet (not shown but located beneath the gap between the second wall-ironing die and the block 35) for the containers 10.
  • Beneath the outlet is a conveyor 41 for removing the containers.
  • Beneath the inlet (as shown in Figure 1 a) is a cradle 42 into which the blanks 13 are fed gravitationally and individually.
  • a guide 44 receives the blanks and means (not shown) is provided in known manner for catching the blanks and releasing them individually.
  • the apparatus includes a mandrel (or punch) 50 of clyindrical form and fixed to a hollow piston rod 55 which may be reciprocated by a hydraulic ram (or mechanical crank).
  • the mandrel has an end face 52 formed complementary to the formations 35 on the impression die 24.
  • the mandrel is received within a sleeve 54, there being an annular gap between the mandrel and the sleeve.
  • the sleeve is slidable on a piston (not shown) to which the piston rod is secured.
  • the outer surface of the piston rod 55 supports a severing die 56.
  • the severing die has a sharp edge formed adjacent an annular groove 57 around the mandrel.
  • the groove is defined by a rebate in the mandrel and an end wall of the piston rod 55 supporting the severing die 56, so that the sharp edge thereof is radially aligned with the edge of the groove.
  • the sleeve 54 is complementary to the rebate 25 in the drawing die 21 and is advanceable to engage in this rebate.
  • the sleeve may, in known manner, have a resilient connection with the piston (not shown), so that on advancement of the piston to advance the mandrel, the sleeve is advanced until it is stopped by engagement with the drawing die 21, when the resilient connection permits continued movement of the mandrel.
  • the mandrel 50 is advanced together with the sleeve 54 towards and into engagement with a blank 13 held in the cradle 42.
  • the sleeve and the mandrel enter the open end of the blank and the sleeve deforms the cylindrical wall 15 of the blank and urges it against the rebated wall of the drawing die 21.
  • the mandrel 50 continues to move relative to the sleeve 54 and pushes the blank through the drawing die, so that the blank is reshaped to the mandrel with a base of reduced diameter a cylindrical wall of increased length. This process is illustrated in Figure 1b.
  • the mandrel 50 continues to advance and forces the re-shaped blank 13 through the first wall-ironing die 22. This process thins and lengthens the cylindrical wall of the blank along the mandrel, as is apparent from Figure 1 c.
  • the mandrel continues to force the blank through the second wall-ironing die 23, as shown in Figure 1 d, and this further thins and lengthens the cylindrical wall to its final length.
  • cup 34 is pneumatically moved in the housing 37 to urge the impression die 24 against the end 52 of the mandrel (as shown in Figure 1 e), to form circular ridges in the base.
  • the frusto-conical surface 31 of the second wall-ironing die co-operates with the sharp edge of the severing die 56 to trim a rim portion of the cylindrical wall, so that the wall is cut to a predetermined length.
  • the second wall-ironing die causes the metal of the cylindrical wall 12 of the container to flow into the groove 57, so that an inner bead is formed around the rim of the container.
  • the cylindrical wall is severed immediately adjacent the bead.
  • Figure 2 more cleary shows the formation of this bead 60 and the severing step, which removes a trim 61.
  • the mandrel 50 is then retracted and the inherent resilience of the container 10 causes the cylindrical wall to open out slightly, so that the bead 60 is retracted from the groove 57 and the rim engages the end face 62 of the second wall-ironing die, thereby preventing retraction of the container.
  • the container falls through the outlet onto the conveyor 41 and the trim 61 also falls away into a collection bin.
  • the depth of the groove 57 is, preferably, sufficient to permit formation of a bead 60, which stands proud of the cylindrical wall 12 by 0.06 to 0.07 mm.
  • the width (i.e. the dimension parallel to the container axis) of the groove and of the bead is between 0.7 and 1.5 mm and preferably about 1 mm.
  • the severing, or trimming step may be carried out in a separate operation on a separate trimming machine.
  • the provision of the bead is extremely important in preventing the container from beginning to split longitudinally from the rim.
  • the bead significantly increases the rim strength without noticeably increasing the weight of the container. It is possible, therefore, for a container to be made with thinner walls than is usual without any greater risk of splitting.
  • the increase in the mean value from 256.7 to 301.2 is significant at the 0.1% probability level.
  • the invention may be applied to cans of materials other than tin coated steel, such as aluminium or aluminium alloy.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Claims (10)

1. Procédé pour fabriquer un récipient métallique d'une seule pièce en forme de coupe, dans lequel on lamine les parois d'une ébauche préformée ayant une base et une paroi cylindrique de façon à allonger cette paroi cylindrique, caractérisé en ce qu'on forme un bourrelet circonférentiel intérieur sur la paroi cylindrique vers la fin de l'opération de laminage, et on coupe le bord de la paroi cylindrique près du bourrelet.
2. Procédé selon la revendication 1, dans lequel l'opération de laminage des parois est effectuée en déplaçant l'un par rapport à l'autre une matrice de laminage annulaire et un mandrin sur lequel la paroi cylindrique est laminée, caractérisé en ce qu'une gorge est ménagée autour du mandrin de façon que de la matière de la paroi cylindrique flue dans la gorge pour former le bourrelet pendant la dernière partie de l'opération de laminage.
3. Procédé selon la revendication 2, caractérisé en ce que l'opération de laminage des parois se continue après la formation d'un bourrelet au droit d'un bord coupant pour effectuer ladite coupe.
4. Dispositif de laminage de parois utilisé pour fabriquer un récipient métallique d'une seule pièce en forme de coupe à partir d'une ébauche préformée ayant une base et une paroi cylindrique, le dispositif comportant un mandrin pouvant être introduit à l'intérieur de la paroi cylindrique et une matrice annulaire de laminage de paroi pour laminer la paroi cylindrique le long du mandrin afin d'allonger cette paroi cylindrique, caractérisé en ce qu'une gorge circonférentielle est ménagée autour du mandrin près de la portion du mandrin formant le bord, grâce à quoi un bourrelet circonférential interne monobloc est formée sur la paroi cylindrique près du bord par le mouvement relatif du mandrin et de la matrice de laminage.
5. Dispositif de laminage de parois selon la revendication 4, caractérisé en ce qu'il est prévu des moyens de coupe au voisinage de la gorge et pouvant coopérer avec la matrice de laminage pour couper le bord de la paroi cylindrique allongée.
6. Dispositif de laminage de parois selon la revendication 5, caractérisé en ce que les moyens de coupe comportent un bord coupant radialement aligné avec un bord de la gorge de telle sorte que le bourrelet est au voisinage immédiat du bord libre de la paroi cylindrique coupée.
7. Récipient métallique d'une seule pièce en forme de coupe ayant une base et une paroi cylindrique allongée monobloc, dans lequel la paroi cylindrique a été allongée par laminage et a éte coupée pour donner un récipient d'une longueur prédéterminée, caractérisé en ce qu'un bourrelet circonférentiel interne monobloc est formé dans la paroi cylindrique près du bord.
8. Récipient selon la revendication 7, caractérisé en ce que le bourrelet affleure le bord.
9. Récipient selon la revendication 7 ou la revendication 8, caractérisé en ce que le bourrelet a une dimension axiale supérieure à sa dimension radiale par rapport à la paroi cylindrique.
10. Récipient selon la revendication 9, caractérisé en ce que la dimension radiale est 0,06 à 0,07 mm.
EP80300961A 1979-04-07 1980-03-27 Réceptacles en forme de boîte et procédé et dispositif pour leur fabrication Expired EP0017434B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7912327 1979-04-07
GB7912327 1979-04-07

Publications (2)

Publication Number Publication Date
EP0017434A1 EP0017434A1 (fr) 1980-10-15
EP0017434B1 true EP0017434B1 (fr) 1983-03-23

Family

ID=10504428

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Application Number Title Priority Date Filing Date
EP80300961A Expired EP0017434B1 (fr) 1979-04-07 1980-03-27 Réceptacles en forme de boîte et procédé et dispositif pour leur fabrication

Country Status (4)

Country Link
EP (1) EP0017434B1 (fr)
AU (1) AU5715980A (fr)
DE (1) DE3062402D1 (fr)
ES (1) ES8104733A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU554674B2 (en) * 1981-08-07 1986-08-28 American National Can Corp. Redrawing an elongated container
JPH0538526A (ja) * 1991-08-05 1993-02-19 Toyota Motor Corp 素材円筒部のしごきトリミング法
GB9119418D0 (en) * 1991-09-11 1991-10-23 Decorpart Ltd Apparatus and methods for press forming of articles
EP1666745B1 (fr) 2003-09-16 2016-11-09 NTN Corporation Roulement a aiguilles du type coque, structure de support pour arbre principal de compresseur, et structure de support pour section d'entrainement d'une pompe a piston
WO2020117641A1 (fr) * 2018-12-04 2020-06-11 Novelis Inc. Système de réétirage et de chaudronnage

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2503828A1 (de) * 1975-01-30 1976-08-05 Friedrich Reiner Telefonfabrik Permanentdynamische elektro-akustische wandlerkapsel

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE582448C (de) * 1930-07-16 1933-08-15 Epos Aluminium Werk E Pfaendle Kaltziehverfahren fuer Aluminiumblech zur Herstellung von Behaeltern o. dgl. mit oberem Verstaerkungsrand
DE1602538A1 (de) * 1967-06-16 1970-03-05 Rasselstein Ag Vorrichtung zum Beschneiden von tiefgezogenen und anschliessend abstreckgezogenen Hohlkoerpern
US3610018A (en) * 1969-01-31 1971-10-05 Nat Steel Corp Reinforced wall-ironed container and manufacture
BE795263A (fr) * 1972-02-11 1973-05-29 K M Engineering A G Procede de fabrication sans enlevement de copeaux de recipients en tole d'acier
DE2256334B2 (de) * 1972-11-16 1974-09-05 Wuerttembergische Metallwarenfabrik, 7340 Geislingen Verfahren zum Abstreck-Gleitziehen von Metallhohlkörpern
US3945231A (en) * 1973-10-31 1976-03-23 Toyo Seikan Kaisha Limited Process and apparatus for preparation of thin walled cylindrical vessels
JPS588924B2 (ja) * 1974-03-22 1983-02-18 ヨシザキ コウゾウ イツタイカンセイケイゴ ノ カタヌキオヨウイニスル ホウホウ

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2503828A1 (de) * 1975-01-30 1976-08-05 Friedrich Reiner Telefonfabrik Permanentdynamische elektro-akustische wandlerkapsel

Also Published As

Publication number Publication date
ES490321A0 (es) 1981-04-16
AU5715980A (en) 1980-10-09
DE3062402D1 (en) 1983-04-28
EP0017434A1 (fr) 1980-10-15
ES8104733A1 (es) 1981-04-16

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