EP1153840B1 - Method for manufacturing an annular part of metal sheet for a can lid - Google Patents

Method for manufacturing an annular part of metal sheet for a can lid Download PDF

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Publication number
EP1153840B1
EP1153840B1 EP01105859A EP01105859A EP1153840B1 EP 1153840 B1 EP1153840 B1 EP 1153840B1 EP 01105859 A EP01105859 A EP 01105859A EP 01105859 A EP01105859 A EP 01105859A EP 1153840 B1 EP1153840 B1 EP 1153840B1
Authority
EP
European Patent Office
Prior art keywords
tube
coating
corrugations
lid
along
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
EP01105859A
Other languages
German (de)
French (fr)
Other versions
EP1153840A1 (en
Inventor
Werner Erfgen
Reiner Dr. Sauer
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.)
ThyssenKrupp Rasselstein GmbH
Original Assignee
Rasselstein Hoesch GmbH
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 Rasselstein Hoesch GmbH filed Critical Rasselstein Hoesch GmbH
Publication of EP1153840A1 publication Critical patent/EP1153840A1/en
Application granted granted Critical
Publication of EP1153840B1 publication Critical patent/EP1153840B1/en
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
    • 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
    • B21D51/44—Making closures, e.g. caps
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/16—Making other particular articles rings, e.g. barrel hoops
    • 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
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/50—Non-integral frangible members applied to, or inserted in, preformed openings, e.g. tearable strips or plastic plugs
    • B65D17/501—Flexible tape or foil-like material
    • B65D17/502—Flexible tape or foil-like material applied to the external part of the container wall only
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S72/00—Metal deforming
    • Y10S72/702—Overbending to compensate for springback

Definitions

  • the invention relates to a method for producing a ring part from sheet metal for a Can lid.
  • This method has a number of disadvantages.
  • laser welding the Made of an organic material, heat-sealable coating that is on the Outside of the pipe is destroyed. Combustion products of the coating get into the melt flow of the weld and cause a carbon enrichment in the Weld seam, which is associated with a hardening of the weld seam.
  • the hardening of the Seam is four to five times the hardness of the base material.
  • the Burning of the coating takes place explosively, causing holes in the Weld seam arise.
  • To ensure the sealability in the weld area is it is necessary to repair the weld area with a new coating.
  • Another disadvantage is that the high hardness of the weld seam the formability reduced and leads to increased wear of the forming tools.
  • FIG. 1 shows a ring part 1 with an outer flange 2 for not receiving one illustrated can body.
  • a cylindrical section closes on the outer flange 2 3, which merges into a radially inwardly extending annular surface, which acts as a support surface 4 serves for a tear film 5.
  • a curl 6 adjoins this bearing surface 4. This section is rolled up to form the curl 6.
  • the top of the ring part 1 is coated with a heat-sealable coating 7. This coating is thus also found on the top of the bearing surface 4, with which one flat heat seal 8 is achieved with the tear film 5.
  • the bottom of the Tear film 5 can also be coated with a heat-sealable coating 9, which also achieves a heat seal 10 with the curl 6. With that the Can contents protected from the bare end 11 of the curl 6.
  • the other side of the Ring part 1 and the tear film 5 are provided with a lacquer layer 12 and 13, respectively. It should it is a sealable lacquer.
  • a flat sheet metal part is formed into a cylindrical tube 14, wherein the flat sheet metal part is pulled by means of clamping jaws 15 over a cylinder 16, whereby the axially extending edges 17 are pressed against each other.
  • the heat sealable Coating 7 is located on the inside.
  • the axially extending edges 17 are connected by means of a laser beam 19 Cooling plate 18 prevents the coating 7 from being destroyed in the region of the seam 20.
  • the pipe 14 is divided into pipe sections as described in DE 43 32 306 A1.
  • FIG. 3 shows a pipe section 21 to be formed into a ring part 1 internal coating 7.
  • a pipe section 21 is attached to the top molded conical widening 22.
  • the drawn section with 23 is designated.
  • the cylindrical Section 3 is the cylindrical Section 3 in place. The resulting molded part is shown in FIG. 6.
  • the conical widening 21 becomes an annular flange 24 towards the outside formed and the outer flange 2 is formed, which serves to accommodate the can body.
  • the inner end is simultaneously folded down, with which the support surface 4 is formed becomes.
  • the folded end is rolled up according to Figure 9 and forms the Enrollment 6.
  • the cylindrical tube 14 is provided with beads 25, the tube is then divided into pipe sections 21A, the subdivision in each case Area of a bead increase and a bead recess.
  • the upper region is flared and the lower region formed radially inwards.
  • the subsequent processing steps correspond to the Figures 7 to 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Closures For Containers (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • ing And Chemical Polishing (AREA)
  • Rolling Contact Bearings (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

For the manufacture of a ring part out of a flat sheet-metal part to form a lid for a lid of a can. A hot-sealable coating is provided on one side of the sheet-metal part which is then shaped into a cylindrical tube with the coating being on the inside. The axially extending edges of the tube are joined together to form a butt-joint and the inside surface thereof pressed against a cooling plate. A butt-joint welding seam is then created by means of a laser jet. The tube is separated into equal length tube sections and each is conically enlarged at one end. The other end of each tube section is bent radially inwardly to form a bearing surface for a tear-off foil. By flanging the conically enlarged end, an annular flange is created to receive a body of a can.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines Ringteils aus Blech für einen Dosendeckel.The invention relates to a method for producing a ring part from sheet metal for a Can lid.

Ein solches Verfahren ist beispielsweise in der DE 43 32 306 A1 beschrieben. Hierbei wird ein ebenes Blechteil, das an einer Seite eine heißsiegelfähige Beschichtung aufweist, zu einem zylindrischen Rohr umgeformt, bei welchem sich die Beschichtung auf der Rohraußenseite befindet. Die axial verlaufenden Ränder des Rohres werden zusammengepreßt und miteinander verschweißt, was mittels eines Laserstrahls erfolgt und zur Bildung einer Stumpfstoßschweißnaht führt. Das Rohr wird sodann in gleich lange Rohrabschnitte bzw. Zargen unterteilt. Jede Zarge wird zu einem Ringteil umgeformt und zwar außen zur Bildung eines Außenbördels, der zur Aufnahme des Dosenrumpfes dient. Innenseitig wird eine Einrollung angebracht, deren Oberseite als Auflagefläche zum Anbringen einer Aufreißfolie dient. Diese Auflagefläche weist die heißsiegelfähige Beschichtung auf, so daß die Aufreißfolie mit dieser Auflagefläche versiegelt werden kann.Such a method is described for example in DE 43 32 306 A1. Here will a flat sheet metal part, which has a heat-sealable coating on one side, into one formed cylindrical tube, in which the coating on the outside of the tube located. The axially extending edges of the tube are pressed together and welded together, which is done by means of a laser beam and to form a Butt butt weld leads. The pipe is then divided into pipe sections of the same length or Frames divided. Each frame is formed into a ring part and the outside for formation an outer flange, which is used to hold the can body. Inside is a Roll up attached, the top of which as a support surface for attaching a tear film serves. This contact surface has the heat-sealable coating, so that the Tear foil can be sealed with this contact surface.

Dieses Verfahren ist mit einer Reihe von Nachteilen behaftet. Beim Laserschweißen wird die aus einem organischen Material bestehende heißsiegelfähige Beschichtung, die sich auf der Außenseite des Rohres befindet, zerstört. Verbrennungsprodukte der Beschichtung geraten in den Schmelzfluß der Schweißnaht und bewirken einen Kohlenstoffanreicherung in der Schweißnaht, womit eine Aufhärtung der Schweißnaht verbunden ist. Die Aufhärtung der Naht beträgt das Vier- bis Fünffache im Vergleich zur Härte des Grundwerkstoffes. Die Verbrennung der Beschichtung findet explosionsartig statt, wodurch Löcher in der Schweißnaht entstehen. Um die Siegelfähigkeit im Schweißnahtbereich zu gewährleisten, ist es erforderlich, den Schweißnahtbereich durch eine neue Beschichtung zu reparieren. Weiterhin ist von Nachteil, daß die hohe Härte der Schweißnaht die Umformfähigkeit verringert und zu einem erhöhten Verschleiß der Umformwerkzeuge führt. This method has a number of disadvantages. With laser welding, the Made of an organic material, heat-sealable coating that is on the Outside of the pipe is destroyed. Combustion products of the coating get into the melt flow of the weld and cause a carbon enrichment in the Weld seam, which is associated with a hardening of the weld seam. The hardening of the Seam is four to five times the hardness of the base material. The Burning of the coating takes place explosively, causing holes in the Weld seam arise. To ensure the sealability in the weld area, is it is necessary to repair the weld area with a new coating. Another disadvantage is that the high hardness of the weld seam the formability reduced and leads to increased wear of the forming tools.

Es besteht die Aufgabe, das Verfahren so auszubilden, daß bei leichter Verformbarkeit des Blechteils eine heißsiegelfähig beschichtete Auflagefläche für die Aufreißfolie geschaffen wird.It is the task of designing the method so that with easy deformability of the Sheet metal part created a heat sealable coated contact surface for the tear film becomes.

Gelöst wird diese Aufgabe mit den Merkmalen des Anspruches 1. Vorteilhafte Ausgestaltungen sind den Unteransprüchen entnehmbar.This problem is solved with the features of claim 1. Advantageous Refinements can be found in the subclaims.

Ausführungsbeispiele werden nachfolgend anhand der Zeichnungen näher erläutert. Es zeigen:

Figur 1:
einen Schnitt durch einen Dosendeckelrand;
Figur 2:
eine Darstellung des Verschweißens eines Blechteils;
Figuren 3 bis 9:
eine Darstellung der aufeinanderfolgenden Verfahrensschritte zur Herstellung des Ringteils;
Figur 10:
eine Ausführungsvariante der Verarbeitung eines zylindrischen Rohrs und
Figuren 11 und 12:
Verfahrensvarianten der in den Figuren 3 bis 6 dargestellten Verfahrensschritte.
Exemplary embodiments are explained in more detail below with reference to the drawings. Show it:
Figure 1:
a section through a can lid edge;
Figure 2:
a representation of the welding of a sheet metal part;
Figures 3 to 9:
a representation of the successive process steps for producing the ring part;
Figure 10:
a variant of the processing of a cylindrical tube and
Figures 11 and 12:
Process variants of the process steps shown in Figures 3 to 6.

Die Figur 1 zeigt ein Ringteil 1 mit einem Außenbördel 2 zur Aufnahme eines nicht dargestellten Dosenrumpfes. An den Außenbördel 2 schließt sich ein zylindrischer Abschnitt 3 an, der in eine radial nach innen verlaufende Ringfläche übergeht, die als Auflagefläche 4 für eine Aufreißfolie 5 dient. An diese Auflagefläche 4 schließt sich eine Einrollung 6 an. Dieser Abschnitt ist zur Bildung der Einrollung 6 nach oben eingerollt.FIG. 1 shows a ring part 1 with an outer flange 2 for not receiving one illustrated can body. A cylindrical section closes on the outer flange 2 3, which merges into a radially inwardly extending annular surface, which acts as a support surface 4 serves for a tear film 5. A curl 6 adjoins this bearing surface 4. This section is rolled up to form the curl 6.

Die Oberseite des Ringteils 1 ist mit einer heißsiegelfähigen Beschichtung 7 beschichtet. Diese Beschichtung findet sich somit auch auf der Oberseite der Auflagefläche 4, womit eine flächige Heißversiegelung 8 mit der Aufreißfolie 5 erreicht wird. Die Unterseite der Aufreißfolie 5 kann ebenfalls mit einer heißsiegelfähigen Beschichtung 9 beschichtet sein, womit auch eine Heißversiegelung 10 mit der Einrollung 6 erreicht wird. Damit wird der Doseninhalt vom blanken Ende 11 der Einrollung 6 geschützt. Die jeweils andere Seite des Ringteils 1 und der Aufreißfolie 5 sind mit einer Lackschicht 12 bzw. 13 versehen. Es sollte sich hierbei um einen siegelfähigen Lack handeln.The top of the ring part 1 is coated with a heat-sealable coating 7. This coating is thus also found on the top of the bearing surface 4, with which one flat heat seal 8 is achieved with the tear film 5. The bottom of the Tear film 5 can also be coated with a heat-sealable coating 9, which also achieves a heat seal 10 with the curl 6. With that the Can contents protected from the bare end 11 of the curl 6. The other side of the Ring part 1 and the tear film 5 are provided with a lacquer layer 12 and 13, respectively. It should it is a sealable lacquer.

Gemäß Figur 2 wird ein ebenes Blechteil zu einem zylindrischen Rohr 14 umgeformt, wobei das ebene Blechteil mittels Klemmbacken 15 über einen Zylinder 16 gezogen wird, wodurch die axial verlaufenden Ränder 17 gegeneinander gepreßt werden. Die heißsiegelfähige Beschichtung 7 befindet sich hierbei auf der Innenseite. Längs der Ränder 17 weist der Zylinder 16 eine Kühlplatte 18 auf, längs der innenseitig ein Kühlmedium fließt. Die Verbindung der axial verlaufenden Ränder 17 erfolgt mittels eines Laserstrahls 19. Durch die Kühlplatte 18 wird verhindert, daß im Bereich der Naht 20 die Beschichtung 7 zerstört wird. Durch entsprechende Steuerung des Laserstrahls 19 kann erreicht werden, daß die Beschichtung 7 im Bereich der Naht 20 anschmilzt, so daß die Naht 20 innenseitig durch die Beschichtung 7 flüssigkeitsdicht abgedeckt ist. Das Rohr 14 wird in Rohrabschnitte unterteilt, wie dies in der DE 43 32 306 A1 beschrieben ist.According to Figure 2, a flat sheet metal part is formed into a cylindrical tube 14, wherein the flat sheet metal part is pulled by means of clamping jaws 15 over a cylinder 16, whereby the axially extending edges 17 are pressed against each other. The heat sealable Coating 7 is located on the inside. Along the edges 17 of the Cylinder 16 has a cooling plate 18 along which a cooling medium flows on the inside. The The axially extending edges 17 are connected by means of a laser beam 19 Cooling plate 18 prevents the coating 7 from being destroyed in the region of the seam 20. By appropriate control of the laser beam 19 can be achieved that the Coating 7 melts in the area of the seam 20, so that the seam 20 inside through the Coating 7 is covered liquid-tight. The pipe 14 is divided into pipe sections as described in DE 43 32 306 A1.

Die Figur 3 zeigt einen in ein Ringteil 1 umzuformdenden Rohrabschnitt 21 mit innenliegender Beschichtung 7. Nach Figur 4 wird an diesen Rohrabschnitt 21 oben eine konische Aufweitung 22 angeformt. Im nächsten Schritt gemäß Figur 5 wird das untere Ende des Rohrabschnitts 21 radial nach innen eingezogen, wobei der eingezogene Abschnitt mit 23 bezeichnet ist. Zwischen der Aufweitung 22 und dem Abschnitt 23 ist der zylindrische Abschnitt 3 vorhanden. Das dann sich ergebende Umformteil ist in Figur 6 gezeigt.FIG. 3 shows a pipe section 21 to be formed into a ring part 1 internal coating 7. According to FIG. 4, a pipe section 21 is attached to the top molded conical widening 22. In the next step according to Figure 5, the lower end of the pipe section 21 is drawn radially inwards, the drawn section with 23 is designated. Between the widening 22 and the section 23 is the cylindrical Section 3 in place. The resulting molded part is shown in FIG. 6.

Gemäß Figur 7 wird die konische Aufweitung 21 nach außen zu einem Ringflansch 24 umgeformt und der Außenbördel 2 angeformt, der zur Aufnahme des Dosenrumpfes dient. Das innere Ende wird gleichzeitig nach unten abgekantet, womit die Auflagefläche 4 gebildet wird. Das abgekantete Ende wird gemäß Figur 9 nach oben eingerollt und bildet die Einrollung 6.According to FIG. 7, the conical widening 21 becomes an annular flange 24 towards the outside formed and the outer flange 2 is formed, which serves to accommodate the can body. The inner end is simultaneously folded down, with which the support surface 4 is formed becomes. The folded end is rolled up according to Figure 9 and forms the Enrollment 6.

Gemäß Figur 10 wird das zylindrische Rohr 14 mit Sicken 25 versehen, wobei das Rohr anschließend in Rohrabschnitte 21A unterteilt wird, wobei die Unterteilung jeweils im Bereich einer Sickenerhöhung und einer Sickenvertiefung erfolgt. Gemäß den Figuren 11 und 12 wird am Rohrabschnitt 21A der obere Bereich konisch aufgeweitet und der untere Bereich radial nach innen umgeformt. Die sich anschließenden Bearbeitungsschritte entsprechen den Figuren 7 bis 9.According to Figure 10, the cylindrical tube 14 is provided with beads 25, the tube is then divided into pipe sections 21A, the subdivision in each case Area of a bead increase and a bead recess. According to Figures 11 and 12 at the tube section 21A, the upper region is flared and the lower region formed radially inwards. The subsequent processing steps correspond to the Figures 7 to 9.

Claims (5)

  1. Method for manufacturing an annular part (1) of sheet metal for a can lid with the following steps:
    a) forming a flat sheet metal part exhibiting a heat sealable coating (7) on one side to form a cylindrical tube (14) with the coating (7) located on the inside,
    b) pressing the axial edges (17) of the tube (4) together to form a butt joint and pressing a cooling plate (18) against the inside of the tube (14) along the axial edges (17),
    c) producing a butt joint weld seam (20) along the axial edges (17) by means of a laser beam (19) directed at the outside of the edges (17),
    d) dividing the tube (14) into tube portions (21) of equal length,
    e) widening one end of each tube portion (21) conically,
    f) drawing in the other end of each tube portion (21) radially to form a supporting surface (4) for a tear-off sheet (5) and
    g) flanging the conically widened end to form an external flange (2) for receiving a can body.
  2. Method according to claim 1, characterised in that corrugations (25) are formed in the tube (14) before the division of the tube (14) into tube portions (21), the division takes place along the hollows of the corrugations and along the bulges of the corrugations, and the area of the bulge of the corrugations of each tube portion (21A) is widened conically.
  3. Method according to claim 1, characterised in that a cylindrical portion (3) is left between the conical widening (22) of one end and the radially inwardly formed other end.
  4. Method according to one of claims 1 to 3, characterised in that the portion adjoining the supporting surface (4) on the inside is angled downwards and the angled portion is rolled upwards.
  5. Method according to claim 4, characterised in that the rolling is carried out such that the upper edge of the rolled part (6) runs in the plane of the supporting surface (4).
EP01105859A 2000-05-10 2001-03-09 Method for manufacturing an annular part of metal sheet for a can lid Expired - Lifetime EP1153840B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10022553 2000-05-10
DE10022553A DE10022553C1 (en) 2000-05-10 2000-05-10 Method for producing ring part from sheet metal for can lid involves forming flat plate part with hot-sealable coating on inside into cylindrical tube

Publications (2)

Publication Number Publication Date
EP1153840A1 EP1153840A1 (en) 2001-11-14
EP1153840B1 true EP1153840B1 (en) 2002-09-11

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EP01105859A Expired - Lifetime EP1153840B1 (en) 2000-05-10 2001-03-09 Method for manufacturing an annular part of metal sheet for a can lid

Country Status (8)

Country Link
US (1) US6554556B2 (en)
EP (1) EP1153840B1 (en)
JP (1) JP4541588B2 (en)
AT (1) ATE223844T1 (en)
DE (2) DE10022553C1 (en)
DK (1) DK1153840T3 (en)
ES (1) ES2180522T3 (en)
PT (1) PT1153840E (en)

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Also Published As

Publication number Publication date
PT1153840E (en) 2003-01-31
ES2180522T3 (en) 2003-02-16
US6554556B2 (en) 2003-04-29
JP2002001469A (en) 2002-01-08
US20010041115A1 (en) 2001-11-15
ATE223844T1 (en) 2002-09-15
DE50100023D1 (en) 2002-10-17
DE10022553C1 (en) 2001-07-05
EP1153840A1 (en) 2001-11-14
JP4541588B2 (en) 2010-09-08
DK1153840T3 (en) 2002-10-21

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