EP0045116B1 - Procédé pour éjecter un récipient embouti d'un poinçon de réétirage et poinçon de réétirage pour exécuter ce procédé - Google Patents

Procédé pour éjecter un récipient embouti d'un poinçon de réétirage et poinçon de réétirage pour exécuter ce procédé Download PDF

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Publication number
EP0045116B1
EP0045116B1 EP81200865A EP81200865A EP0045116B1 EP 0045116 B1 EP0045116 B1 EP 0045116B1 EP 81200865 A EP81200865 A EP 81200865A EP 81200865 A EP81200865 A EP 81200865A EP 0045116 B1 EP0045116 B1 EP 0045116B1
Authority
EP
European Patent Office
Prior art keywords
wall
mandril
ironing
sleeve
fluid
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
EP81200865A
Other languages
German (de)
English (en)
Other versions
EP0045116A1 (fr
Inventor
Hendrik Gerrit Heijting
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.)
Thomassen and Drijver Verblifa NV
Original Assignee
Thomassen and Drijver Verblifa NV
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 Thomassen and Drijver Verblifa NV filed Critical Thomassen and Drijver Verblifa NV
Priority to AT81200865T priority Critical patent/ATE7275T1/de
Publication of EP0045116A1 publication Critical patent/EP0045116A1/fr
Application granted granted Critical
Publication of EP0045116B1 publication Critical patent/EP0045116B1/fr
Expired 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
    • B21D45/00—Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass
    • B21D45/06—Stripping-off devices

Definitions

  • the invention relates to a method of releasing a wall-ironed sleeve having an enlarged wall thickness at the end remote from the bottom from a wall-ironing mandril whereby pressurized fluid is led to the operative surface of the mandril causing the sleeve to be released from the mandril.
  • a pressurized fluid is introduced at the front face of the wall-ironing mandril.
  • a further disadvantage of the prior art is that the introduction of fluid at the front face of the wall-ironing mandril brings about the risk of bottom deformation as well as the risk of the sleeve being, so to say, shot away, which may give rise to unsatisfactory process control and to disturbances in automatic processes.
  • the invention has for its object to obviate the disadvantages of the prior art and provides a method of the kind set forth in which the fluid is allowed to enter at the transitional region between the normal wall thickness and the enlarged wall thickness. It is pointed out that the axial position of the admission of the fluid corresponds to a region where no wall-ironing operation takes place, since otherwise fluid inlet apertures might become clogged, the fluid being now admitted as near as possible the zone where the operation concerned is carried out in order to maximize the effect.
  • the fluid pressure preferably amounts to at least 10 bars.
  • Experiments with tinned iron sleeves having a wall thickness of about 0.1 mm have shown that, for example, at a fluid pressure of about 25 bars the sleeve can be released substantially without friction.
  • the invention furthermore relates to a wall-ironing mandril suitable for carrying into effect the method according to the invention, said mandril having a cylindrical, relatively broad part at its free end, a cylindrical, relatively narrow part coaxial to the former and a substantially conical part interconnecting said two cylindrical parts and at least one fluid inlet conduit opening out at the operative surface, said wall-ironing mandril being characterized in accordance with the invention in that the at least one fluid inlet conduit opens out in the region of the transitional part between the cylindrical, relatively narrow part and the conical part.
  • a plurality of fluid inlet apertures are arranged along the circumference.
  • At least one pressure equalizing duct opening out at the front face is preferably provided at least one pressure equalizing duct opening out at the front face. This excludes at the same time any risk of the atmospheric pressure between the front face of the mandril and the bottom of the sleeve deforming the sleeve bottom and the neighbouring wall parts.
  • sleeves having wall thicknesses of even less than 0.1 mm can be stripped off the wall-ironing mandril without deformation of the material.
  • an appreciable saving of material can be obtained by reducing length differences between the initially manufactured and the finally trimmed sleeves. Moreover, disturbances of the process are minimized, which is conductive to the productivity, whilst in addition the various tools have a considerably longer lifetime, which means saving of costs.
  • the device schematically shown in Figure 1 comprises a wall-ironing mandril 1 embodying the invention, a first wall-ironing ring 2, a second wall-ironing ring 3, a third wall-ironing ring 4 as well as a frame 5 interconnecting the three wall-ironing rings.
  • the wall-ironing mandril is axially driven by means of a plunger 7 actuated by means not shown and being rigidly connected by known coupling means with the wall-ironing mandril 1.
  • the device is in that stage of the wall-ironing process in which a formed sleeve 6 has to be released from the wall-ironing mandril 1.
  • the wall-ironing mandril has a plurality of circumferentially disposed fluid inlet apertures 8 located in the area of a transitional part shown in the drawing, particularly Figures 2 and 3, between the relatively narrow part 9 of the wall-ironing mandril 1 and the conical part 11 connecting the narrow part 9 with the relatively broad part 10 with a view to the releasing operation.
  • the fluid inlet apertures 8 communicate in the manner illustrated in Figure 1 through a flexible pressure duct 12 with a source 13 of pressurized fluid.
  • This pressurized fluid source is energized synchronously with the displacement of the plunger 7 or continuously in a manner such that the releasing operation takes place after the accomplishment of the wall-ironing operation proper.
  • the wall-ironing mandril 1 has a fluid inlet aperture 14 which communicates in the manner shown in Figure 1 through a second pressure duct 15 with a second source 16 of pressurized fluid, for example, compressed air.
  • This source is also energized synchronously with the displacement of the plunger 7 or else permanently.
  • the axial positions of the apertures 8 may be chosen within wide limits on either side.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Forging (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Metal Extraction Processes (AREA)
  • Press Drives And Press Lines (AREA)
  • Reciprocating Pumps (AREA)

Claims (6)

1. Procédé pour dégager d'un mandrin (1) de formage par étirage un manchon (6) formé par étirage ayant une epaisseur de paroi plus large à son extrémité éloignée du fond du manchon, du fluide sous pression étant acheminé vers la surface opérationnelle du mandrin pour ainsi dégager le manchon du mandrin, caractérisé en ce que le fluide est admis dans une région de transition (en 11) entre l'épaisseur de paroi normale (en 10) et l'épaisseur de paroi plus large (en 9).
2. Procédé selon la revendication 1, caractérisé en ce que la pression du fluide s'élève à au moins 10 bars.
3. Mandrin de formage par étirage pour la mise en oeuvre du procédé selon l'une des revendications précédentes, ledit mandrin (1) comportant une partie cylindrique relativement large (10) à son extrémité libre, une partie cylindrique relativement étroite (9) coaxiale avec la première, une partie sensiblement conique (11) reliant entre elles les deux parties cylindriques, et au moins un conduit d'admission de fluide s'ouvrant sur la surface opérationnelle caractérisé en ce que le conduit d'admission de fluide (8) s'ouvre dans la région d'une partie de transition (11) entre la partie cylindrique relativement étroite (9) et la partie conique (11).
4. Mandrin selon la revendication 3, caractérisé par une pluralité d'ouvertures d'admission de fluide (8) disposées circonférentielle- ment.
5. Mandrin selon l'une des revendications 3 et 4, caractérisé par au moins un conduit d'équilibrage des pressions (14) s'ouvrant sur la face avant.
6. Mandrin selon la revendication 5, caractérisé en ce que le conduit d'équilibrage des pressions (14) est en communication libre avec l'atmosphère.
EP81200865A 1980-07-30 1981-07-30 Procédé pour éjecter un récipient embouti d'un poinçon de réétirage et poinçon de réétirage pour exécuter ce procédé Expired EP0045116B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81200865T ATE7275T1 (de) 1980-07-30 1981-07-30 Verfahren zum abstreifen tiefgezogener hohlkoerper von einem ziehdorn und ziehdorn zum ausfuehren dieses verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8004357A NL8004357A (nl) 1980-07-30 1980-07-30 Werkwijze voor het vanaf een duntrekdoorn lossen van een dungetrokken bus en duntrekdoorn voor uitvoering van die werkwijze.
NL8004357 1980-07-30

Publications (2)

Publication Number Publication Date
EP0045116A1 EP0045116A1 (fr) 1982-02-03
EP0045116B1 true EP0045116B1 (fr) 1984-05-02

Family

ID=19835683

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81200865A Expired EP0045116B1 (fr) 1980-07-30 1981-07-30 Procédé pour éjecter un récipient embouti d'un poinçon de réétirage et poinçon de réétirage pour exécuter ce procédé

Country Status (7)

Country Link
EP (1) EP0045116B1 (fr)
JP (1) JPS57115923A (fr)
AT (1) ATE7275T1 (fr)
AU (1) AU553560B2 (fr)
DE (1) DE3163393D1 (fr)
NL (1) NL8004357A (fr)
ZA (1) ZA814567B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9507204D0 (en) * 1995-04-07 1995-05-31 Metal Box Plc Base forming of can bodies
JP6032750B2 (ja) * 2013-10-18 2016-11-30 旭精機工業株式会社 パンチ及びプレス成形機

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3402591A (en) * 1964-10-28 1968-09-24 Reynolds Metals Co Apparatus for making drawn and ironed cans or containers
US3406554A (en) * 1965-07-06 1968-10-22 Continental Can Co Apparatus for and method of forming containers
US3524338A (en) * 1968-02-05 1970-08-18 Continental Can Co Stripping punch
JPS5129323Y2 (fr) * 1971-01-28 1976-07-23
US3771344A (en) * 1972-10-30 1973-11-13 Crown Cork & Seal Co Apparatus for stripping container bodies from metal working punches

Also Published As

Publication number Publication date
ZA814567B (en) 1982-07-28
AU7347281A (en) 1982-02-04
EP0045116A1 (fr) 1982-02-03
AU553560B2 (en) 1986-07-24
DE3163393D1 (en) 1984-06-07
JPS57115923A (en) 1982-07-19
NL8004357A (nl) 1982-03-01
ATE7275T1 (de) 1984-05-15
JPH0116573B2 (fr) 1989-03-24

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