EP0619152A1 - Tête de dilatation pour outil évaseur pour pièces à usiner creuses - Google Patents

Tête de dilatation pour outil évaseur pour pièces à usiner creuses Download PDF

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Publication number
EP0619152A1
EP0619152A1 EP93105591A EP93105591A EP0619152A1 EP 0619152 A1 EP0619152 A1 EP 0619152A1 EP 93105591 A EP93105591 A EP 93105591A EP 93105591 A EP93105591 A EP 93105591A EP 0619152 A1 EP0619152 A1 EP 0619152A1
Authority
EP
European Patent Office
Prior art keywords
flange
sectors
guide
jaws
expanding
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.)
Granted
Application number
EP93105591A
Other languages
German (de)
English (en)
Other versions
EP0619152B1 (fr
Inventor
Karl-Heinz Velte
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.)
Rothenberger Werkzeuge AG
Original Assignee
Rothenberger Werkzeugemaschinen 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
Priority to DE4202348A priority Critical patent/DE4202348C1/de
Application filed by Rothenberger Werkzeugemaschinen GmbH filed Critical Rothenberger Werkzeugemaschinen GmbH
Priority to EP93105591A priority patent/EP0619152B1/fr
Priority to ES93105591T priority patent/ES2106912T3/es
Priority to DK93105591.7T priority patent/DK0619152T3/da
Priority to AT93105591T priority patent/ATE156732T1/de
Publication of EP0619152A1 publication Critical patent/EP0619152A1/fr
Application granted granted Critical
Publication of EP0619152B1 publication Critical patent/EP0619152B1/fr
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
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging
    • B21D41/026—Enlarging by means of mandrels

Definitions

  • the invention relates to an expansion head for expanding tools according to the preamble of claim 1.
  • Such expanding tools are also referred to as expanders.
  • the expanding jaws are moved radially by the axial stroke of a conically tapered end of an expanding mandrel.
  • the expanding mandrel is in turn driven by a cam, toggle lever, control slots or also by hydraulic means, etc.
  • the ratio of the stroke of the expanding mandrel to the radial path of the expanding jaws is determined by the opening angle of the expanding mandrel.
  • the invention is therefore based on the object of specifying an expansion head of the type described at the outset, which can be used in conjunction with expanders (basic devices) in which the stroke of the expanding mandrel of the basic device is increased with a conventional opening angle and thus the possible opening path of the expanding jaws.
  • the opening angle is maintained for the purpose of being able to use conventional expansion heads with the same basic device.
  • the guide pins can no longer loosen even during the usually very rough operation on a construction site.
  • the stiffness that otherwise occurs due to canting of the expanding jaws within the radial guide elements is avoided when retracting. Since both ring springs are arranged on the maximum possible diameters, i.e. they are long, two strong springs with identical flat characteristics can be used, which is very beneficial for the large radial travel of the expanding jaws.
  • the flange sectors Due to the interference fit in at least one of the two associated bores, the flange sectors are stiffened against one another and despite simple manufacture and little overlap to extremely precise guide elements.
  • the bores for the guide pins in the outer flange sectors are designed as blind bores. In this way, the pins can no longer be ejected by laymen, so that the expansion head is protected against being fitted with expanding jaws that do not belong together.
  • an expansion head 1 which includes a cap 2 with a radially inwardly directed guide flange 3 and with a set of sector-shaped expansion jaws 4.
  • Knurls 2a increase the grip of the expansion head to be screwed on by hand.
  • the spreading jaws 4 are each guided individually on the guide flange 3 by means of an inner flange sector 5 and an outer flange sector 6 and a radial groove 7 formed between them. It is understood that the flange sectors 5 and 6 are made in one piece with the expanding jaws.
  • a bore 8 or 9 is arranged, both of which are aligned with one another and in which the respective ends of a guide pin 10 parallel to the axis "A" are accommodated, which in this way have the groove 7 , stored on both ends, bridged.
  • the outer flange sectors 6 have at least the same diameter as the inner flange sectors 5 and have groove sectors 11 and 12 on their outer sides, which complement each other on the entire circumference to form an annular groove interrupted by gaps 13.
  • Radial guide grooves 14 for receiving and moving the guide pins 10 are arranged in the guide flange 3. Both in the inner flange sectors 5 and on the outer flange sectors 6 are in said groove sectors 11 or 12 annular tension springs 15 and 16 for the provision of the expanding jaws 4.
  • the bores 9 in the outer flange sectors 6 are designed as blind bores.
  • the guide pins 10 are held with a press fit in at least one of the two associated bores 8 and 9.
  • the guide pins 10 are designed as grooved pins.
  • the expanding jaws 4 have been produced from a rotating body with the axis "A", which has been broken down into six sectors by the column 13 (sawing column), as can be seen from FIG. 2.
  • the gap width was chosen in accordance with the radial stroke, in such a way that the working surfaces 4a and 4b, in the most widely spread position, complement each other to cylindrical surfaces which are only separated by the said gaps and correspond to the maximum expansion diameter if one considers the resetting or springback the workpiece once.
  • conical surfaces 16 which interact with the expanding mandrel, not shown here, which is subjected to pressure and consequently have its opening angle.
  • These conical surfaces do not lie, at least not at the beginning of the expansion movement, over their entire axial length on the conical surface of the expanding mandrel, and they only lie flat on the expanding mandrel in a single axial intermediate position, so that they can perform rocking movements outside of this position, e.g. then, when the pipe material flows differently when expanded over the circumference, which is by no means rare.
  • the base area is in the Area of the flange sectors. This distinguishes such an expansion head from devices with the cone surfaces in the opposite position. In such devices, the expanding mandrel is subjected to tension, but must then be removed to change an expansion head. In the subject matter of the invention, it is sufficient to separate the expansion head 1 from the basic device by means of the internal thread 2b of the cap 2.
  • the flow behavior of the materials during expansion additionally illuminates the value of the radial guide elements in the area of the guide flange 3:
  • the expansion jaws which are particularly slim for smaller pipe diameters, are subjected to very high bending stresses, which in turn results in tilting moments in the area of the radial guide elements. Tilting leads to additional stiffness, which requires higher actuation forces and thus puts additional strain on the expanding jaws.
  • the complete device is a hand tool, which is usually operated like a pair of pliers and has two hand levers for driving the expanding mandrel. By increasing the stroke of the expanding mandrel, the situation is becoming increasingly critical.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Earth Drilling (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP93105591A 1992-01-29 1993-04-05 Tête de dilatation pour outil évaseur pour pièces à usiner creuses Expired - Lifetime EP0619152B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE4202348A DE4202348C1 (en) 1992-01-29 1992-01-29 Tube end expansion tool - has holding drillings for guide pins at inner and outer flange sectors
EP93105591A EP0619152B1 (fr) 1992-01-29 1993-04-05 Tête de dilatation pour outil évaseur pour pièces à usiner creuses
ES93105591T ES2106912T3 (es) 1992-01-29 1993-04-05 Cabezal de expansion para herramientas abocardadoras para piezas de trabajo huecas.
DK93105591.7T DK0619152T3 (da) 1992-01-29 1993-04-05 Ekspansionshoved til udvideværktøj til hule emner
AT93105591T ATE156732T1 (de) 1992-01-29 1993-04-05 Expansionskopf für aufweitewerkzeuge für hohle werkstücke

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4202348A DE4202348C1 (en) 1992-01-29 1992-01-29 Tube end expansion tool - has holding drillings for guide pins at inner and outer flange sectors
EP93105591A EP0619152B1 (fr) 1992-01-29 1993-04-05 Tête de dilatation pour outil évaseur pour pièces à usiner creuses

Publications (2)

Publication Number Publication Date
EP0619152A1 true EP0619152A1 (fr) 1994-10-12
EP0619152B1 EP0619152B1 (fr) 1997-08-13

Family

ID=25911322

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93105591A Expired - Lifetime EP0619152B1 (fr) 1992-01-29 1993-04-05 Tête de dilatation pour outil évaseur pour pièces à usiner creuses

Country Status (5)

Country Link
EP (1) EP0619152B1 (fr)
AT (1) ATE156732T1 (fr)
DE (1) DE4202348C1 (fr)
DK (1) DK0619152T3 (fr)
ES (1) ES2106912T3 (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4339993C1 (de) * 1993-11-24 1995-01-05 Rothenberger Werkzeuge Masch Vorrichtung zum Aufweiten von Hohlkörpern
DE4446506A1 (de) * 1994-12-25 1996-06-27 Rothenberger Werkzeuge Masch Vorrichtung zum Aufweiten von Hohlkörpern
DE19730054C1 (de) * 1997-07-14 1999-03-18 Eckhard Wolter Expansionswerkzeug zum Verformen rohrförmiger Werkstückenden
DE19924695C2 (de) * 1999-05-28 2001-05-10 Rothenberger Werkzeuge Ag Expansionswerkzeug für Hohlkörper und Verfahren zu dessen Herstellung
DE19963885C1 (de) * 1999-12-30 2001-05-03 Rehau Ag & Co Verfahren zum Aufweiten von flexiblen Rohren und Vorrichtung zur Durchführung des Verfahrens
DE102007007294B3 (de) 2007-02-14 2008-07-10 Rothenberger Ag Antriebsgerät mit einer Kupplung für Werkzeugköpfe
DE202010004948U1 (de) * 2010-04-13 2011-09-01 Rehau Ag + Co. Expanderkopf für hohle Werkstücke mit geführten Segmenten
DE102010035222B4 (de) * 2010-08-24 2013-04-18 Rothenberger Ag Kupplung für die axiale Verbindung eines Antriebsgerätes mit einem Expanderkopf
DE102010035221B4 (de) * 2010-08-24 2013-04-18 Rothenberger Ag Kupplung für die axiale Verbindung eines Antriebsgeräts mit Expanderkopf
EP2608935B1 (fr) 2010-08-24 2018-02-28 Rothenberger AG Éléments d'accouplement pour raccorder un appareil d'entraînement à une tête d'expanseur
DE102012100894A1 (de) 2012-02-03 2013-08-08 Rehau Ag + Co Expansionskopf für Aufweitwerkzeuge, diesen umfassendes Expansionswerkzeug sowie deren Verwendung
DE202012104450U1 (de) 2012-11-19 2014-02-25 Rehau Ag + Co Expansionskopf für Aufweitwerkzeuge und diesen umfassendes Expansionswerkzeug
CN110773651A (zh) * 2019-11-05 2020-02-11 武汉威研工程技术有限公司 一种便携式自定心扩孔器
DE202019107067U1 (de) * 2019-12-18 2021-03-19 Rehau Ag + Co Expansionskopf für Aufweitwerkzeuge sowie diesen umfassendes Aufweitwerkzeug

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2459506A1 (de) * 1974-09-13 1976-04-01 Rast Patent Mfg Pty Klauenanordnung fuer ein expansionswerkzeug
EP0044795A2 (fr) * 1980-07-18 1982-01-27 UNICUM S.A. (Société Anonyme) Tête d'expansion pour un appareil destiné à évaser ou à élargir les extrémités des tubes ou similaires
EP0499094A2 (fr) * 1991-02-12 1992-08-19 Rothenberger Werkzeuge-Maschinen Gmbh Elargisseur pour les pièces à usiner creux

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB866994A (en) * 1957-11-13 1961-05-03 Wlodimierz Rast Improvements in or relating to an expanding tool for pipes
US3550424A (en) * 1968-06-12 1970-12-29 Wlodzimierz Rast Tube expander
AU8441475A (en) * 1974-09-13 1977-03-03 Ridge Tool Co. Jaw construction for expanding tools

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2459506A1 (de) * 1974-09-13 1976-04-01 Rast Patent Mfg Pty Klauenanordnung fuer ein expansionswerkzeug
EP0044795A2 (fr) * 1980-07-18 1982-01-27 UNICUM S.A. (Société Anonyme) Tête d'expansion pour un appareil destiné à évaser ou à élargir les extrémités des tubes ou similaires
EP0499094A2 (fr) * 1991-02-12 1992-08-19 Rothenberger Werkzeuge-Maschinen Gmbh Elargisseur pour les pièces à usiner creux

Also Published As

Publication number Publication date
DE4202348C1 (en) 1993-06-09
EP0619152B1 (fr) 1997-08-13
ES2106912T3 (es) 1997-11-16
ATE156732T1 (de) 1997-08-15
DK0619152T3 (da) 1998-04-06

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