EP0004252B1 - Method for making a funnel for aerosol containers - Google Patents

Method for making a funnel for aerosol containers Download PDF

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Publication number
EP0004252B1
EP0004252B1 EP79810021A EP79810021A EP0004252B1 EP 0004252 B1 EP0004252 B1 EP 0004252B1 EP 79810021 A EP79810021 A EP 79810021A EP 79810021 A EP79810021 A EP 79810021A EP 0004252 B1 EP0004252 B1 EP 0004252B1
Authority
EP
European Patent Office
Prior art keywords
funnel
collar
weakening
torn out
central portion
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
EP79810021A
Other languages
German (de)
French (fr)
Other versions
EP0004252A1 (en
Inventor
Werner Diemi
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.)
Styner and Bienz AG
Original Assignee
Styner and Bienz AG
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 Styner and Bienz AG filed Critical Styner and Bienz AG
Publication of EP0004252A1 publication Critical patent/EP0004252A1/en
Application granted granted Critical
Publication of EP0004252B1 publication Critical patent/EP0004252B1/en
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
    • 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
    • B21D51/40—Making outlet openings, e.g. bung holes
    • 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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/24—Perforating, i.e. punching holes
    • B21D28/32—Perforating, i.e. punching holes in other articles of special shape
    • 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
    • B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs

Definitions

  • the present invention relates to a method for producing an aerosol funnel, in which a sheet metal plate is deep-drawn to the funnel, then a circular central part is torn out by means of an axially acting stamp and removed in a hollow stamp, and finally the remaining opening collar is rolled up.
  • a method of this type is known from US-A-3 910 213.
  • the hollow punch on which the funnel lies has a sharp outer edge along which the material in the strong radially inward pull after the impact of the axially acting punch tears. This creates considerable tensile prestresses at the crack, which has an unfavorable effect on the subsequent rolling in of the opening collar.
  • the present invention has for its object to also achieve favorable conditions for the subsequent curling of the collar by means of a simple tool with a long service life for tearing out the middle part.
  • This object is achieved in that in the deep-drawn funnel, supported on a mandrel, by means of an embossing tool without contact with the mandrel, a weak point is embossed on the outside of the funnel, along which the middle part is then torn out.
  • a weakening crevice with a large opening angle of, for example, 90 ° is preferably pressed, as a result of which the material on the side of the crevice is considerably deformed and subjected to pressure.
  • the funnel is transferred to a next processing station, in which the central part is torn out and removed into the hollow stamp. This allows a particularly simple tool design.
  • the funnel provided with the weakening crack 6 then arrives in a further station of the tool on a hollow punch 7.
  • a punch 8 which is lowered from above and acts axially, the middle part 4 is torn out along the weakening crack 6 and through the hollow part as a middle part 4a separated from the funnel Stamp 7 pressed down.
  • the deep-drawn middle part 4a comes under one Shoulder 9 in the bore of the hollow stamp 7 and can no longer emerge upwards when the stamp 8 is subsequently raised.
  • the middle part is separated from the collar 3 by radially inwardly directed forces, and these forces are relatively small thanks to the weakening groove 6, so that the compressive stresses mentioned essentially remain on the resulting upper edge of the collar 3.
  • the funnel 1 is fixed in its position so that it cannot move upward in its position due to the radial forces that occur.
  • the funnel is then removed from the hollow punch 7 according to FIG. 2, and the collar 3 is rolled up in a manner known per se in order to form a round bead.
  • This bead is indicated in dash-dotted lines in Figure 2 and designated 10.
  • An advantage of the method according to the invention is that the mandrel 2 and the embossing tool 5 and of course also the punches 7 and 8 do not have to be very precise, since they can never come into direct contact with one another and consequently can also be produced from very hard material . The wear is therefore extremely low.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines Aerosoltrichters, wobei eine Blechscheibe zum Trichter tiefgezogen, dann ein kreisförmiger Mittelteil mittels eines axial wirkenden Stempels ausgerissen und in einem hohlen Stempel abgeführt und schließlich der verbleibende Öffnungskragen eingerollt wird.The present invention relates to a method for producing an aerosol funnel, in which a sheet metal plate is deep-drawn to the funnel, then a circular central part is torn out by means of an axially acting stamp and removed in a hollow stamp, and finally the remaining opening collar is rolled up.

Ein Verfahren dieser Art ist bekannt aus der US-A-3 910 213. Der hohle Stempel, auf welchem der Trichter liegt, weist eine scharfe Außenkante auf, längs welcher das Material bei dem starken radial einwärts wirkenden Zug nach dem Auftreffen des axial wirkenden Stempels reißt. Es entstehen hierbei an der Rißstelle erhebliche Zugvorspannungen, die sich ungünstig auf das nachfolgende Einrollen des Öffnungskragens auswirken.A method of this type is known from US-A-3 910 213. The hollow punch on which the funnel lies has a sharp outer edge along which the material in the strong radially inward pull after the impact of the axially acting punch tears. This creates considerable tensile prestresses at the crack, which has an unfavorable effect on the subsequent rolling in of the opening collar.

Ein ähnliches Vorgehen ist aus der US-A-2 772 735 bekannt, wobei jedoch der Mittelteil nicht durch den axial wirkenden Stempel ausgerissen, sondern der durch ein übliches Schnittwerkzeug ausgeschnitten wird. Hierbei entstehen zwar keine Zugvorspannungen, aber der verbieibende Öffnungskragen weist einen vorerst nach innen vorstehenden oberen Rand auf, der mit nach außen gerollt werden muß, was diese Operation erschwert. Zudem weist das Werkzeug infolge der sich direkt berührenden Schnittkanten eine hohe Abnützung auf.A similar procedure is known from US-A-2 772 735, but the central part is not torn out by the axially acting punch, but is cut out by a conventional cutting tool. Although there are no tensile pretensions, the remaining opening collar has an upper edge which initially protrudes inwards and which has to be rolled outwards, which makes this operation difficult. In addition, the tool has a high degree of wear due to the directly touching cutting edges.

Es ist versucht worden, die Bedingungen für das anschließende Einrollen des Öffnungskragens dadurch zu verbessern, daß man mittels eines sehr genau bearbeiteten Schnittwerkzeugs am äußeren Ende der den Kragen und den ebenen Mittelteil des tiefgezogenen Trichters verbindenden, gebogenen Übergangsstelle durchschneidet (US-A-3 706 292). Dieses Vorgehen ist jedoch heikel, und die Abnutzung des Werkzeugs ist besonders groß.Attempts have been made to improve the conditions for the subsequent curling of the opening collar by cutting through the curved transition point connecting the collar and the flat central part of the deep-drawn funnel by means of a very precisely machined cutting tool (US Pat. No. 3,706 292). However, this procedure is delicate and the wear on the tool is particularly great.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, mittels eines einfachen Werkzeugs mit hoher Standzeit zum Ausreißen des Mittelteils ebenfalls günstige Voraussetzungen für das anschließende Einrollen des Kragens zu erzielen. Diese Aufgabe wird dadurch gelöst, daß in den tiefgezogenen, auf einem Dorn gestützten Trichter mittels eines Prägewerkzeugs ohne Berührung mit dem Dorn auf der Außenseite des Trichters eine Schwächungsritze geprägt wird, längs welcher dann der Mittelteil ausgerissen wird.The present invention has for its object to also achieve favorable conditions for the subsequent curling of the collar by means of a simple tool with a long service life for tearing out the middle part. This object is achieved in that in the deep-drawn funnel, supported on a mandrel, by means of an embossing tool without contact with the mandrel, a weak point is embossed on the outside of the funnel, along which the middle part is then torn out.

Dadurch, daß sich weder beim Einprägen der Schwächungsritze noch beim Ausreißen des Mittelteils Werkzeugteile direkt zu berühren brauchen, ist die Abnützung der Werkzeugteile sehr gering. Die Genauigkeit der Werkzeuge braucht auch nicht sehr hoch zu sein. Es wurde festgestellt, daß beim Einprägen der Schwächungsritze in den angrenzenden Trichterteilen, insbesondere im verbleibenden Öffnungskragen, Druckvorspannungen entstehen, die sich beim anschließenden Einrollen des Öffnungskragens günstig auswirken, was die Verwendung von hartem, sprödem Blech, beispielsweise dem unter der Bezeichnung »TEMPER 3« bekannten Weißblech ohne weiteres erlaubt.The fact that tool parts do not need to touch directly when impressing the weakening crack or when the middle part is torn out means that the wear of the tool parts is very low. The accuracy of the tools need not be very high either. It was found that when the weakening crack was embossed in the adjacent funnel parts, in particular in the remaining opening collar, compressive prestresses occur which have a favorable effect when the opening collar is subsequently rolled in, which is the result of the use of hard, brittle sheet metal, for example that known as "TEMPER 3" known tinplate allowed without further notice.

Vorzugsweise wird eine Schwächungsritze mit großem Öffnungswinkel von beispielsweise 90° gepreßt, wodurch eine erhebliche Verformung und Druckbeanspruchung des Materials seitlich der Ritze erfolgt.A weakening crevice with a large opening angle of, for example, 90 ° is preferably pressed, as a result of which the material on the side of the crevice is considerably deformed and subjected to pressure.

Weiter kann es von Vorteil sein, daß nach dem Prägen der Schwächungsritze der Trichter in eine nächste Bearbeitungsstation übergeführt wird, in welcher der Mittelteil ausgerissen und in den hohlen Stempel abgeführt wird. Dies erlaubt eine besonders einfache Werkzeugausführung.Furthermore, it can be advantageous that after embossing the weakening crack, the funnel is transferred to a next processing station, in which the central part is torn out and removed into the hollow stamp. This allows a particularly simple tool design.

Im folgenden wird die Erfindung anhand der Zeichnung näher erläutert.

  • Figur 1 zeigt ein erstes Stadium des Herstellungsvorgangs;
  • Figur 2 zeigt ein zweites Stadium des Herstellungsvorgangs; und
  • Figur 3 zeigt einen vergrößerten Ausschnitt aus Figur 1.
The invention is explained in more detail below with reference to the drawing.
  • Figure 1 shows a first stage of the manufacturing process;
  • Figure 2 shows a second stage of the manufacturing process; and
  • FIG. 3 shows an enlarged section from FIG. 1.

Der in üblicher Weise vorbereitete und tiefgezogene Aerosoltrichter 1 wird gemäß Figur 1 auf einen Dorn 2 aufgesetzt, dessen Durchmesser genau dem Innendurchmesser des Öffnungskragens 3 des Trichters entspricht und der die gerundeten Übergangsstellen zwischen dem Kragen 3 und dem Mittelteil 4 des Trichters formschlüssig unterstützt wie Figur 3 zeigt.1 is placed on a mandrel 2, the diameter of which corresponds exactly to the inner diameter of the opening collar 3 of the funnel and which supports the rounded transition points between the collar 3 and the central part 4 of the funnel in a form-fitting manner as in FIG. 3 shows.

Gegen den Trichter wird nun ein ringförmiges Prägewerkzeug 5 abgesenkt, dessen Kante eine kreisförmige Schwächungsritze 6 ungefähr in der Mitte der gerundeten Übergangsstelle zwischen dem Kragen 3 und dem Mittelteil 4 einprägt. Der Öffnungswinkel dieser Schwächungsritze ist verhältnismäßig groß und beträgt beim dargestellten Ausführungsbeispiel 90°. Er könnte jedoch durch entsprechende Formgebung des Prägewerkzeugs 5 an seiner Prägekante unter Umständen noch größer sein. Wesentlich ist jedenfalls, daß eine Schwächungsritze mit verhältnismäßig großem Öffnungswinkel geprägt wird, damit möglichst viel Material seitlich verdrängt wird, was in den angrenzenden Teilen des Kragens 3 bzw. des Mittelteils 4 zu einer erheblichen Materialverformung und zu Druckvorspannungen führt. Die Wirkung dieser Druckvorspannungen im nachher entstehenden Rand des Kragens 3 sind bereits erläutert worden.An annular stamping tool 5 is now lowered against the funnel, the edge of which stamps a circular weakening groove 6 approximately in the middle of the rounded transition point between the collar 3 and the central part 4. The opening angle of this weakening crack is relatively large and is 90 ° in the illustrated embodiment. However, it could, under certain circumstances, be even larger by appropriately shaping the embossing tool 5 on its embossing edge. In any case, it is essential that a weakening crack is embossed with a relatively large opening angle, so that as much material as possible is laterally displaced, which leads to considerable material deformation and compressive stresses in the adjacent parts of the collar 3 or the central part 4. The effect of these compressive prestresses in the edge of the collar 3 that subsequently arises have already been explained.

Der mit der Schwächungsritze 6 versehene Trichter gelangt dann in eine weitere Station des Werkzeugs auf einen hohlen Stempel 7. Mittels eines von oben abgesenkten, axial wirkenden Stempels 8 wird der Mittelteil 4 längs der Schwächungsritze 6 ausgerissen und als vom Trichter getrennter Mittelteil 4a durch den hohlen Stempel 7 heruntergepreßt. Der dabei tiefgezogene Mittelteil 4a gelangt unter eine Schulter 9 in der Bohrung des hohlen Stempels 7 und kann nicht mehr nach oben austreten, wenn nachträglich der Stempel 8 angehoben wird. Die Trennung des Mittelteils vom Kragen 3 erfolgt durch radial nach innen gerichtete Kräfte, und diese Kräfte sind dank der Schwächungsritze 6 verhältnismäßig gering, so daß die erwähnten Druckvorspannungen am entstehenden oberen Rand des Kragens 3 im wesentlichen verbleiben.The funnel provided with the weakening crack 6 then arrives in a further station of the tool on a hollow punch 7. By means of a punch 8 which is lowered from above and acts axially, the middle part 4 is torn out along the weakening crack 6 and through the hollow part as a middle part 4a separated from the funnel Stamp 7 pressed down. The deep-drawn middle part 4a comes under one Shoulder 9 in the bore of the hollow stamp 7 and can no longer emerge upwards when the stamp 8 is subsequently raised. The middle part is separated from the collar 3 by radially inwardly directed forces, and these forces are relatively small thanks to the weakening groove 6, so that the compressive stresses mentioned essentially remain on the resulting upper edge of the collar 3.

Während des Abreißens des Mittelteils wird der Trichter 1 in seiner Position fixiert, damit er sich durch die auftretenden radialen Kräfte in seiner Position nicht nach oben verschieben kann.During the tearing off of the central part, the funnel 1 is fixed in its position so that it cannot move upward in its position due to the radial forces that occur.

Es wird dabei darauf geachtet, die Schwächungsritze 6 so tief als möglich zu führen, so daß beispielsweise noch eine Materialstärke von 0,06 bis 0,08 mm verbleibt. Zugkräfte könnten also beim Abreißen des Mittelteils nur noch in unmittelbarer Umgebung der verbleibenden Materialstärke auftreten, jedoch gesamthaft den Effekt der vorher aufgeprägten Druckspannungen nicht mehr aufheben.Care is taken to guide the weakening groove 6 as deep as possible so that, for example, a material thickness of 0.06 to 0.08 mm remains. When the middle part is torn off, tensile forces could only occur in the immediate vicinity of the remaining material thickness, but overall no longer cancel out the effect of the previously applied compressive stresses.

Der Trichter wird sodann vom hohlen Stempel 7 nach Figur 2 entfernt, und der Kragen 3 wird in an sich bekannter Weise eingerollt, um einen Rundwulst zu bilden. Dieser Wulst ist in Figur 2 in strichpunktierten Linien angedeutet und mit 10 bezeichnet.The funnel is then removed from the hollow punch 7 according to FIG. 2, and the collar 3 is rolled up in a manner known per se in order to form a round bead. This bead is indicated in dash-dotted lines in Figure 2 and designated 10.

Ein Vorteil des erfindungsgemäßen Verfahrens besteht darin, daß der Dorn 2 und das Prägewerkzeug 5 sowie natürlich auch die Stempel 7 und 8 keine sehr hohe Präzision aufzuweisen brauchen, da sie nie in direkte gegenseitige Berührung gelangen können und demzufolge auch aus sehr hartem Material hergestellt werden können. Die Abnützung ist somit äußerst gering.An advantage of the method according to the invention is that the mandrel 2 and the embossing tool 5 and of course also the punches 7 and 8 do not have to be very precise, since they can never come into direct contact with one another and consequently can also be produced from very hard material . The wear is therefore extremely low.

Claims (3)

1. A method for producing an aerosol can top in which a blank is deep drawn for forming a funnel-shaped member, whereafter a circular central portion is torn out by means of an axially working punch and carried off within a hollow sleeve and then the remaining nm of the opening is curled, characterized in that at the outer side of the deep drawn funnel-shaped member supported onto a thorn, a weakening score along which the central portion is subsequently torn out is formed by means of an embossing die not coming into contact with said thorn.
2. Method according to claim 1, characterized in that a weakening score is formed with an angle of aperture of 90°.
3. method according to claims 1 or 2, characterized in that after the forming of the weakening score the funnel-shaped member is transferred to a next processing station in which the central portion is torn out and carried off in said hollow sleeve.
EP79810021A 1978-03-08 1979-03-05 Method for making a funnel for aerosol containers Expired EP0004252B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2506/78 1978-03-08
CH250678A CH626545A5 (en) 1978-03-08 1978-03-08

Publications (2)

Publication Number Publication Date
EP0004252A1 EP0004252A1 (en) 1979-09-19
EP0004252B1 true EP0004252B1 (en) 1982-05-12

Family

ID=4235325

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79810021A Expired EP0004252B1 (en) 1978-03-08 1979-03-05 Method for making a funnel for aerosol containers

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US (1) US4290294A (en)
EP (1) EP0004252B1 (en)
JP (1) JPS54131480A (en)
CH (1) CH626545A5 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT391351B (en) * 1985-11-06 1990-09-25 Steyr Daimler Puch Ag TWO-STROKE COMBUSTION ENGINE WITH CRANKCASE RINSING AND A NOZZLE FOR FUEL INJECTION
JPS6462231A (en) * 1987-09-01 1989-03-08 Shiseido Co Ltd Metal made container and its production
JPS6462232A (en) * 1987-11-11 1989-03-08 Shiseido Co Ltd Aerosol container and its production
US8118197B2 (en) * 2007-06-18 2012-02-21 Precision Valve Corporation Method of making aerosol valve mounting cups and resultant cups
DE102013015051A1 (en) * 2013-09-12 2015-03-12 G. Staehle Gmbh U. Co. Kg Method for producing a blank of a can
CN112605258B (en) * 2020-11-30 2022-09-06 宝山钢铁股份有限公司 Aerosol can machining die and method

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1173793A (en) * 1916-02-29 george
US790735A (en) * 1905-03-10 1905-05-23 Morris Martin Tool for cutting holes in metal tanks.
GB488427A (en) * 1936-01-11 1938-07-06 Crown Cork & Seal Co Improvements in metal bottles or containers and methods of manufacturing the same
US2772735A (en) * 1953-10-09 1956-12-04 Continental Can Co Multiple slide press for cutting sheet metal parts
US3706292A (en) * 1970-08-05 1972-12-19 Nat Steel Corp Manufacture of metal containers with rimmed opening
US3726244A (en) * 1971-04-12 1973-04-10 American Can Co Method and apparatus for forming a fully curled neck on a drawn and ironed pressure can
JPS5313073B2 (en) * 1973-01-11 1978-05-08
NL7401410A (en) * 1973-02-12 1974-08-14
CH577860A5 (en) * 1974-05-30 1976-07-30 Styner & Bienz Ag
US3998086A (en) * 1974-11-15 1976-12-21 Continental Can Company, Inc. Apparatus for perforating the necks of aerosol containers
US3910213A (en) * 1974-11-15 1975-10-07 Continental Can Co Method of perforating the necks of aerosol containers
US4027612A (en) * 1975-07-16 1977-06-07 Continental Can Company, Inc. Method for forming container scored metal flap areas

Also Published As

Publication number Publication date
JPS54131480A (en) 1979-10-12
JPS6344456B2 (en) 1988-09-05
CH626545A5 (en) 1981-11-30
EP0004252A1 (en) 1979-09-19
US4290294A (en) 1981-09-22

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