EP0072891B1 - Method of and device for conically widening metal tubes by compressed air - Google Patents

Method of and device for conically widening metal tubes by compressed air Download PDF

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Publication number
EP0072891B1
EP0072891B1 EP82104100A EP82104100A EP0072891B1 EP 0072891 B1 EP0072891 B1 EP 0072891B1 EP 82104100 A EP82104100 A EP 82104100A EP 82104100 A EP82104100 A EP 82104100A EP 0072891 B1 EP0072891 B1 EP 0072891B1
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EP
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Prior art keywords
sealing
tube
sealing ring
metal tube
mandrel
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Expired
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EP82104100A
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German (de)
French (fr)
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EP0072891A1 (en
Inventor
Alois Ing.Grad. Rettenmaier
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HERLAN & CO. MASCHINENFABRIK GMBH
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Herlan & Co Maschinenfabrik GmbH
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    • 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
    • B21D51/36—Making hollow objects characterised by the use of the objects collapsible or like thin-walled tubes, e.g. for toothpaste

Definitions

  • the invention relates to a method for the conical expansion of metal tubes according to the features listed in the preamble of claim 1 and relates equally to an apparatus for performing the method.
  • the object of the invention is therefore to provide a method and a device in which an absolute tightness is guaranteed during the butting and the associated shortening of the tube, without preventing the metal tube from expanding evenly in the area of the filling opening in accordance with the conical shape of the die ; at the same time, it must be prevented that tube damage in the form of cracks on the edge of the tube, corrugations and paint damage, especially on the inside of the tube, occurs.
  • the method according to the invention and the device for its implementation have the advantage over known methods and devices that by forming a shoulder-like, inwardly directed bevel, a level tube edge is produced during the butting process and thereby an optimal seal is guaranteed during the butting, the tube material being gentle stretches and the outside and inside lacquer as well as the possibly spread inside rubber sealing ring remain undamaged during this process.
  • the inwardly shaped sealing edge is not mechanically shaped outwards due to the lack of flaring and is therefore not overwhelmed. There are only slight marginal stresses and the risk of tearing at the tube edge is largely avoided. Due to the gentle treatment, above all of the painting and possibly rubber coating, by the method according to the invention, the optimal production line arrangement is retained.
  • the device offers further advantages in that it produces the same conical metal tubes regardless of length and diameter tolerances of the cylindrical metal tubes in shape and length and does not require any wear-prone rubber or plastic sealing elements as inner tube seals.
  • the device according to FIG. 1 for the butting of metal tubes belongs to a turret, not shown, in which twelve butting mandrels 13 are clamped.
  • the cylindrical tube 16, possibly with a sprayed-on rubber ring 26, is pushed over two conical mandrels 13 by a lifting element (also not shown), each with a die 5, until the die 5 comes to rest on the outer end face of the tube holder 19, the open tube end opening the in Centered by the conical centering ring 24 and is pressed on the outer tube edge against the force of the compression spring 3 against the sealing surface 2 of the sealing ring 1.
  • the compression spring 3 lies against the end face 8 of the sealing ring 1 facing away from the tube and is prestressed by an adjustable holder (not shown).
  • a sufficient edge pressure between the outer tube edge and the sealing surface 2 inclined at an angle is generated by the spring force in order to initially seal against the inflowing air.
  • the compressed air required for tapering flows through the converter compressed air channel 18 and reaches the inner wall of the cylindrical tube 16 via the axially extending outlet channels 15 distributed over the circumference of the conifying mandrel 13 and the sleeve 25.
  • the converter compressed air channel it is radial running, distributed on the circumference channels 21 of the cone 13 compressed air flowed into the cavity 20.
  • an inward-facing sealing chamfer 6 is formed from the metal sealing surface 2, which is inclined at an angle 8, which can lie between 45 ° and 75 ° to the tube axis 7, the open tube end is sealed airtight and, at the same time, the pneumatic pressure causes it to settle cylindrical metal tube 16 to the conical inner surface of the die 5, the metal tube being axially shortened to a constant length and confined at an angle ⁇ , as shown in FIG. 2.
  • the specific sealing pressure can be increased that a separate compressed air connection is provided on the cavity 20, which can be adapted to the sealing pressure by pressure regulators and thus a max. Pressure build-up guaranteed during the butting process in the interior of the metal tube.
  • the converter compressed air supply is interrupted, the die 5 is removed from the cone mandrel 13 and the butted tube 22 is pressed off from the tube holder 19 by means of tube blow-off air which flows through the tube 17.
  • the molded-on tube edge 6 is leveled at the crack test station (not shown) - one of the successor stations - by the existing sealing cone at the crack test station, so that the butted metal tube is stackable.
  • FIG. 3 shows metal tubes 23 which are stacked one inside the other and are butted coaxially to the tube axis 7 from diameter d i to diameter d 2 by angle a and which can be produced on the device according to the invention with different tube cones or tube spacings p with the same tube diameter.

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

Description

Die Erfindung betrifft ein Verfahren zum konischen Aufweiten von Metalltuben nach den im Oberbegriff des Patentanspruchs 1 aufgeführten Merkmalen und betrifft gleichermaßen eine Vorrichtung zur Ausführung des Verfahrens.The invention relates to a method for the conical expansion of metal tubes according to the features listed in the preamble of claim 1 and relates equally to an apparatus for performing the method.

Durch das konische Aufweiten der Metalltuben soll eine raumsparende Stapelung der Tuben in Stangenform ermöglicht werden, wodurch nur 1/5 des bisherigen Transportvolumens bzw. Verpackungsmaterials benötigt wird.By the conical widening of metal tubes a space-saving stacking of the tubes is to be made possible in rod form, whereby only 1/5 is required of the existing transport volume and packaging material.

Für die Umwandlung von Tuben in die konische Form sind bisher verschiedene Verfahren vorgeschlagen worden, die beispielsweise darin bestehen, daß Tuben an ihrer Basis mit einem elastischen Mantel oder auf andere Weise abgedichtet und geweitet werden.Various methods have hitherto been proposed for converting tubes into the conical shape, which consist, for example, of sealing and expanding tubes at their base with an elastic jacket or in some other way.

Es ist z. B. aus der DE-OS 2 711 649 ein Verfahren bekannt, nach dem an einem offenen zylindrischen Ende einer Tube duch einen elastischen Mantel zunächst die Abdichtung entlang des Tubenrandes erfolgt und anschließend durch Einströmen eines pneumatischen oder hydraulischen Mediums in den abgedichteten Innenraum der Tube die konische Form durch Anlegen an die Innenfläche einer Matrize erfolgt. Durch den nacheinander stattfindenden Prozeß des Abdichtens bei gleichzeitigem Aufweiten des offenen Tubenrandes durch den elastischen Mantel und durch das zeitverzögerte Konifizieren der Tube entstehen Spannungen im Lack und in der Tube, wodurch eine hohe Fehlerquote entstehen kann und wobei durch den Verschleiß des elastischen Mantels ein regelmäßiges Auswechseln des Mantels stattfinden muß.It is Z. B. from DE-OS 2 711 649 a method is known, after which at an open cylindrical end of a tube by means of an elastic jacket, the seal is first made along the edge of the tube and then by inflowing a pneumatic or hydraulic medium into the sealed interior of the tube conical shape by placing on the inner surface of a die. The successive process of sealing with simultaneous widening of the open tube edge due to the elastic jacket and due to the delayed tapering of the tube creates tensions in the lacquer and in the tube, which can result in a high error rate and with regular wear due to the wear of the elastic jacket of the coat must take place.

Aus der DE-PS 2012701 und der DE-AS 2 131 504 ist es ferner bekannt, daß die Abdichtung des offenen Tubenrandes durch Eingreifen eines in Tubenrichtung axial beweglichen Stopfens mit einem Außenkonus in die Füllöffnung der Tube erfolgt. Dabei wird durch den Außenkonus, der einen größeren Kegelwinkel als die Innenwand der Matrize aufweist, der Tubenrand unabhängig vom Konifizieren zusätzlich nach außen aufgespreizt, wodurch häufig Einrisse am Tubenrand und Innenlackbeschädigungen die Folge sind. Durch die nach außen sich weitende Füllöffnung der Tube entstehen Druckluftverluste, die den Konifiziervorgang verteuern würden.From DE-PS 2012701 and DE-AS 2 131 504 it is also known that the sealing of the open tube edge takes place by engaging an axially movable stopper in the tube direction with an outer cone in the filling opening of the tube. The outer cone, which has a larger cone angle than the inner wall of the die, also expands the tube edge to the outside, regardless of the taper, which often results in tears at the tube edge and damage to the interior paint. The filling opening of the tube, which widens outwards, results in compressed air losses which would make the conification process more expensive.

Aufgabe der Erfindung ist es daher, ein Verfahren und eine Vorrichtung zu schaffen, bei denen eine absolute Dichtigkeit während des Konifizierens und der damit verbundenen Tubenverkürzung gewährleistet ist, ohne die Metalltube daran zu hindern, sich auch im Bereich der Füllöffnung gleichmäßig entsprechend der Matrizenkonizität zu weiten; zugleich muß verhindert werden, daß Tubenbeschädigungen in Form von Rissen am Tubenrand, Wellungen und Lackbeschädigungen, insbesondere an der Tubeninnenseite, entstehen.The object of the invention is therefore to provide a method and a device in which an absolute tightness is guaranteed during the butting and the associated shortening of the tube, without preventing the metal tube from expanding evenly in the area of the filling opening in accordance with the conical shape of the die ; at the same time, it must be prevented that tube damage in the form of cracks on the edge of the tube, corrugations and paint damage, especially on the inside of the tube, occurs.

Diese Aufgabe ist erfindungsgemäß dadurch gelöst, daß durch die linienartige Anpressung des äußeren Randes des offenen Endes der zylindrischen Metalltube, die Metalltube gegen die abgeschrägte Dichtfläche des unter Federdruck stehenden, metallisch abdichtenden Dichtringes luftdicht abgeschlossen und während des Konifiziervorganges, um den weiteren Druckaufbau zu ermöglichen, durch die in Tubenrichtung axiale Bewegung des Dichtringes am offenen Rand der Metalltube eine nach innen gerichtete dichtende Fase angeformt wird.This object is achieved in that the line-like pressure of the outer edge of the open end of the cylindrical metal tube, the metal tube against the beveled sealing surface of the spring-loaded, metal sealing ring sealed airtight and during the butting process to enable further pressure build-up, by the axial movement of the sealing ring in the tube direction on the open edge of the metal tube, an inwardly directed sealing chamfer is formed.

Weitere Ausgestaltungen der Erfindung sind in den Unteransprüchen beschrieben.Further refinements of the invention are described in the subclaims.

Das erfindungsgemäße Verfahren und die Vorrichtung zu dessen Durchführung haben gegenüber bekannten Verfahren und Vorrichtungen den Vorteil, daß durch Bildung einer schulterartigen, nach innen gerichteten Fase ein egaler Tubenrand während des Konifiziervorganges hergestellt und dadurch eine optimale Dichtung beim Konifizieren garantiert wird, wobei der Tubenwerkstoff sich schonend dehnt und Außen-und Innenlack sowie der ggf. innen aufgespreizte Gummidichtring bei diesem Vorgang unbeschädigt bleiben. Der nach innen geformte Dichtrand wird gegenüber bekannten Verfahren durch das Fehlen des Aufdornens nicht mechanisch nach außen geformt und dadurch nicht überfordert. Es ergeben sich nur noch geringe Randspannungen und damit werden Einrißgefahren am Tubenrand weitgehendst vermieden. Durch die schonende Behandlung vor allem der Lackierung und ggf. Gummierung durch das erfindungsgemäße Verfahren bleibt die optimale Fertigungslinienanordnung erhalten. Die Vorrichtung bietet weitere Vorteile dadurch, daß sie unabhängig von Längen- und Durchmessertoleranzen der zylindrischen Metalltuben in Form und Länge jeweils gleiche konische Metalltuben hergestellt und dazu keine verschleißanfälligen Dichtelemente aus Gummi oder Kunststoff als Tubeninnendichtung benötigt.The method according to the invention and the device for its implementation have the advantage over known methods and devices that by forming a shoulder-like, inwardly directed bevel, a level tube edge is produced during the butting process and thereby an optimal seal is guaranteed during the butting, the tube material being gentle stretches and the outside and inside lacquer as well as the possibly spread inside rubber sealing ring remain undamaged during this process. Compared to known methods, the inwardly shaped sealing edge is not mechanically shaped outwards due to the lack of flaring and is therefore not overwhelmed. There are only slight marginal stresses and the risk of tearing at the tube edge is largely avoided. Due to the gentle treatment, above all of the painting and possibly rubber coating, by the method according to the invention, the optimal production line arrangement is retained. The device offers further advantages in that it produces the same conical metal tubes regardless of length and diameter tolerances of the cylindrical metal tubes in shape and length and does not require any wear-prone rubber or plastic sealing elements as inner tube seals.

Das erfindungsgemäße Verfahren und die zur Durchführung desselben dienende Vorichtung werden unter Zuhilfenahme der Zeichnungen näher erläutert. Es zeigt

  • Fig. 1 einen axialen Schnitt durch ein Vorrichtung zum konischen Aufweiten zylindrischer Metalltuben mittels Druckluft,
  • Fig. 2 Teil einer konischen Metalltube mit einer nach innen gerichteten Dichtfase des offenen Endes,
  • Fig. 3 einen Längsschnitt durch zwei ineinander geschachtelte egalisierte konische Metalltuben.
The method according to the invention and the device used to carry it out are explained in more detail with the aid of the drawings. It shows
  • 1 shows an axial section through a device for conically expanding cylindrical metal tubes by means of compressed air,
  • 2 part of a conical metal tube with an inward sealing bevel of the open end,
  • Fig. 3 shows a longitudinal section through two nested equalized conical metal tubes.

Die Vorrichtung nach Fig. 1 zum Konifizieren von Metalltuben gehört zu einem nicht dargestellten Revolverkopf, in dem zwölf Konifizierdorne 13 eingespannt sind. Über zwei Konifizierdorne 13 wird durch ein ebenfalls nicht dargestelltes Huborgan mit je einer Matrize 5 die zylindrische Tube 16, ggf. mit aufgespritztem Gummiring 26, geschoben, bis die Matrize 5 an der äußeren Stirnseite des Tubenhalters 19 zur Anlage kommt, wobei das offene Tubenende auf der Innenseite von dem kegeligen Zentrierring 24 zentriert und am äußeren Tubenrand gegen die Kraft der Druckfeder 3 an die Dichtfläche 2 des Dichtringes 1 gedrückt wird. Die Druckfeder 3 liegt dabei an der von der Tube abgewandten Stirnfläche 8 des Dichtringes 1 an und wird durch eine nicht dargestellte einstellbare Halterung vorgespannt. Unabhängig von Durchmesser- und Längentoleranzen der zylindrischen Tube 16 wird durch die Federkraft eine ausreichende Kantenpressung zwischen dem äußeren Tubenrand und der unter einem Winket geneigten Dichtfläche 2 erzeugt, um zunächst gegen die einströmende Luft abzudichten. Die zum Konifizieren benötigte Druckluft strömt durch den Umformer-Druckluftkanal 18 und gelangt über die auf dem Umfang des Konifizierdornes 13 und der Hülse 25 verteilten, axial verlaufenden Austrittskanäle 15 an die Innenwand der zylindrischen Tube 16. Gleichzeitig ist, ausgehend vom Umformer-Druckluftkanal über radial verlaufende, auf dem Umfang verteilte Kanäle 21 des Konifizierdornes 13 Druckluft in den Hohlraum 20 geströmt. Durch die Durchmesserdifferenzen der Gleitflächen 11, 12 des Dichtringes 1 und 11', 12' des Konifizierdornes 13 und Abdichtung des Hohlraumes 20 durch die Dichtelemente 9 und 10 wird unter pneumatischem Druck auf der Ringfläche 4 eine in Tubenrichtung weisende axiale Kraftkomponente erzeugt, die den Dichtring auf den Gleitflächen 11, 12, 11', 12' soweit axial verschiebt, bis die Dichtfläche 2 an der zur Dichtfläche 2 parallelen Anschlagfläche 14 der Matrize 5 anliegt. Dabei wird von der unter einem Winkel,8, der zur Tubenachse 7 zwischen 45° und 75° liegen kann, geneigten metallischen Dichtfläche 2 eine nach innen gerichtete dichtende Fase 6 angeformt, das offene Tubenende luftdicht verschlossen und gleichzeitig legt sich durch den pneumatischen Druck die zylindrische Metalltube 16 an die konische Innenfläche der Matrize 5 an, wobei die Metalltube axial auf ein konstantes Längenmaß verkürzt und unter einem Winkel α konfiziert wird, wie es Fig. 2 wiedergibt.The device according to FIG. 1 for the butting of metal tubes belongs to a turret, not shown, in which twelve butting mandrels 13 are clamped. The cylindrical tube 16, possibly with a sprayed-on rubber ring 26, is pushed over two conical mandrels 13 by a lifting element (also not shown), each with a die 5, until the die 5 comes to rest on the outer end face of the tube holder 19, the open tube end opening the in Centered by the conical centering ring 24 and is pressed on the outer tube edge against the force of the compression spring 3 against the sealing surface 2 of the sealing ring 1. The compression spring 3 lies against the end face 8 of the sealing ring 1 facing away from the tube and is prestressed by an adjustable holder (not shown). Regardless of the diameter and length tolerances of the cylindrical tube 16, a sufficient edge pressure between the outer tube edge and the sealing surface 2 inclined at an angle is generated by the spring force in order to initially seal against the inflowing air. The compressed air required for tapering flows through the converter compressed air channel 18 and reaches the inner wall of the cylindrical tube 16 via the axially extending outlet channels 15 distributed over the circumference of the conifying mandrel 13 and the sleeve 25. At the same time, starting from the converter compressed air channel, it is radial running, distributed on the circumference channels 21 of the cone 13 compressed air flowed into the cavity 20. Due to the differences in diameter of the sliding surfaces 11, 12 of the sealing ring 1 and 11 ', 12' of the conical mandrel 13 and sealing of the cavity 20 by the sealing elements 9 and 10, an axial force component pointing in the direction of the tube is generated under pneumatic pressure on the ring surface 4, which component seals the sealing ring on the sliding surfaces 11, 12, 11 ', 12' axially displaced until the sealing surface 2 rests on the stop surface 14 of the die 5 parallel to the sealing surface 2. In this case, an inward-facing sealing chamfer 6 is formed from the metal sealing surface 2, which is inclined at an angle 8, which can lie between 45 ° and 75 ° to the tube axis 7, the open tube end is sealed airtight and, at the same time, the pneumatic pressure causes it to settle cylindrical metal tube 16 to the conical inner surface of the die 5, the metal tube being axially shortened to a constant length and confined at an angle α, as shown in FIG. 2.

Ist gegen Ende des Konifiziervorganges durch die Durchmesservergrößerung des Tubenendes und die durch den pneumatischen Druck entstehende Kraftkomponente auf die Dichtfläche 2 mit einem zu starken Absinken des von der Ringfläche 4 erzeugten spezifischen Druckes an der Dichtfase 6 zu rechnen, so kann der spezifische Dichtdruck daduch erhöht werden, daß am Hohlraum 20 ein separater Druckluftanschluß vorgesehen wird, der durch Druckregler dem Dichtdruck angepaßt werden kann und somit einen max. Druckaufbau beim Konifiziervorgang im Innenraum der Metalltube garantiert.If, at the end of the conifying process, the diameter increase of the tube end and the force component on the sealing surface 2 resulting from the pneumatic pressure cause the specific pressure generated by the annular surface 4 to drop too sharply at the sealing chamfer 6, the specific sealing pressure can be increased that a separate compressed air connection is provided on the cavity 20, which can be adapted to the sealing pressure by pressure regulators and thus a max. Pressure build-up guaranteed during the butting process in the interior of the metal tube.

Nachdem die zylindrische Tube 16 die erwünschte konische Form angenommen hat, wird die Umformer-Druckluftzufuhr unterbrochen, die Matrize 5 vom Konifizierdorn 13 entfernt und die konifizierte Tube 22 mittels Tubenabblaseluft, die durch das Rohr 17 strömt, vom Tubenhalter 19 abgedrückt.After the cylindrical tube 16 has assumed the desired conical shape, the converter compressed air supply is interrupted, the die 5 is removed from the cone mandrel 13 and the butted tube 22 is pressed off from the tube holder 19 by means of tube blow-off air which flows through the tube 17.

Der angeformte Tubenrand 6 wird an der nicht dargestellten Rißprüfstation - eine der Nachfolgestationen - durch den vorhandenen Dichtkegel an der Rißprüfstation egalisiert, so daß die konifizierte Metalltube stapelfähig ist.The molded-on tube edge 6 is leveled at the crack test station (not shown) - one of the successor stations - by the existing sealing cone at the crack test station, so that the butted metal tube is stackable.

Fig. 3 zeigt ineinander gestapelte, koaxial zur Tubenachse 7 von Durchmesser di auf Durchmesser d2 um Winkel a konifizierte und egalisierte Metalltuben 23, die auf der erfindungsgemäßen Vorrichtung bei gleichem Tubendurchmesser mit verschiedenen Konifizierkegeln bzw. Tubenabständen p hergestellt werden können.

Figure imgb0001
FIG. 3 shows metal tubes 23 which are stacked one inside the other and are butted coaxially to the tube axis 7 from diameter d i to diameter d 2 by angle a and which can be produced on the device according to the invention with different tube cones or tube spacings p with the same tube diameter.
Figure imgb0001

Claims (10)

1. Process for the conical widening of metal tubes (16), wherein the cylindrical metal tube, which is to be shaped into conical form and is closed at one end and open at the other end, is sealed in an airtight manner at the open end, the interior space is placed under pressure by means of a pneumatic medium. And the cylindrical metal tube is pressed onto the interior wall of the matrix (5) designed with a conical recess, characterised in that, due to the linear pressing of the outer edge of the open end of the cylindrical metal tube (16), the metal tube is sealed in an airtight manner against the chamfered sealing surface (2) of the metallic sealing ring (1) which is under spring pressure, and, during the conifi- cation process, in order to permit the further build-up of pressure, an inward-directed sealing chamfer (6) is produced at the open edge of the metal tube (16) by means of the axial movement of the sealing ring (1) in the direction of the tube.
2. Process according to Claim 1, characterised in that in order to flatten off a uniform, inward-directed sealing chamfer (6), the specific sealing pressure is increased with the operating pressure by subjecting the annular surface (4) of the sealing ring (1) to the action of compressed air.
3. Process according to Claim 1, characterised in that in order to flatten a uniform, inward-directed sealing chamfer (6), the specific sealing pressure is matched to the required specific sealing pressure, and is adjustable, independently of the operating pressure by means of a pressure regulator by subjecting the annular surface (4) of the sealing ring (1) to the action of compressed air.
4. Apparatus for conically widening metal tubes (16) and the like, having an internally conical matrix (5) which receives a metal tube, and a conifying mandrel (13) which can be pushed into the matrix and supports a metal tube, a compressed-air source for introducing a pneumatic pressure medium into the internal space of the metal tube, and a sealing element which seals the metal tube in an airtight manner at the open rear end, characterised in that the sealing element is designed as a metal sealing ring (1) in the form of a cylinder which can be moved axially on the conifying mandrel (13) and possesses a sealing surface (2), situated on the end face in the direction of the tube, which extends into the sealing ring (1) at an angle B in an angular range between 45° and 75° to the axis of the tube, in the manner of a truncated cone, and is designed, on that part thereof which extends into the region of the open rear end of the metal tube (16), as a shaping surface for the open edge of the metal tube (16).
5. Apparatus according to Claim 4, characterised in that in order to generate the necessary sealing pressure for sealing the rear tube edge at the sealing surface (2), a compression spring (3) is provided, which acts in the axial direction and is supported on that end face (8) of the sealing ring (1) which faces away from the metal tube.
6. Apparatus according to Claim 4 or 5, characterised by an annular surface (4) which is situated on the shouldered internal hole of the sealing ring (1), and, due to the differences in diamter of the sliding surfaces (11, 11', 12, 12') of the sealing ring (1) and of the conifying mandrel (13) between the sealing elements (9, 10), under pneumatic pressure, generates an axial force component directed towards the metal tube.
7. Apparatus according to one of Claims 4 to 6, characterised by a stop surface (14) which represents the axial limitation, in the tube direction, of the stroke of the sealing ring (1) by contact between the sealing surface (2) of the sealing ring (1) and the stop surface (14) of the matrix (5), which surface is chamfered parallel to the sealing surface (2).
8. Apparatus according to one of Claims 4 to 7, characterised in that the metallic sealing ring (1) consists of hardened steel in order to achieve a wearresistant sealing surface (2) and abrasion- resistant sliding surfaces (11,12).
9. Apparatus according to one of Claims 4 to 8, having a sleeve located within the matrix on the conifying mandrel, outlet ducts for widening the tubes being arranged on the conifying mandrel and on the sleeve, distributed over the periphery, and the conifying mandrel having an axial aperture, characterised in that axially extending outlet ducts (15) of the conifying mandrel (13) and of the sleeve (25) are provided to permit the compressed air to flow through during the re- shaping of the cylindrical tube (16), and in that the compressed air is separated from the tube exhaust air by the pipe (17) extending within the conifying mandrel (13) about the longitudinal axis thereof and ending in the tube holder (19) attached to the conifying mandrel, a second connection for compressed air for reshaping purposes being provided in addition to the connection for the tube exhaust air.
10. Apparatus according to one of Claims 4 to 9, characterised in that the cavity (20) between the annular surface (4) of the sliding surfaces (11) of the sealing ring (1) and (12') of the conifying mandrel (13) is connected to the compressed-air duct (18) for re-shaping purposes by means of radially extending ducts (21) distributed over the periphery.
EP82104100A 1981-08-22 1982-05-12 Method of and device for conically widening metal tubes by compressed air Expired EP0072891B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813133257 DE3133257A1 (en) 1981-08-22 1981-08-22 METHOD AND DEVICE FOR THE CONICAL EXPANSION OF METAL TUBES BY MEANS OF COMPRESSED AIR
DE3133257 1981-08-22

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EP0072891A1 EP0072891A1 (en) 1983-03-02
EP0072891B1 true EP0072891B1 (en) 1985-11-13

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DE3225522A1 (en) * 1982-07-08 1984-01-12 Cebal Verpackungen GmbH & Co KG, 8500 Nürnberg METHOD FOR CONIFICATING TUBES

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GB969453A (en) * 1962-04-26 1964-09-09 Tubed Chemicals Corp Manufacture of squeeze tube containers
HU171756B (en) * 1976-03-30 1978-03-28 Koho Es Gepipari Miniszterium Method and apparatus for producing conical tubes

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EP0072891A1 (en) 1983-03-02
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