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WO1998006519A1 - Expanseur a dispositif de retour - Google Patents

Expanseur a dispositif de retour Download PDF

Info

Publication number
WO1998006519A1
WO1998006519A1 PCT/EP1997/004366 EP9704366W WO9806519A1 WO 1998006519 A1 WO1998006519 A1 WO 1998006519A1 EP 9704366 W EP9704366 W EP 9704366W WO 9806519 A1 WO9806519 A1 WO 9806519A1
Authority
WO
WIPO (PCT)
Prior art keywords
tool according
spreading tool
expansion
members
piston
Prior art date
Application number
PCT/EP1997/004366
Other languages
German (de)
English (en)
Inventor
Friedrich Imgram
Original Assignee
Wirsbo Rohrproduktion Und Vertriebs-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 Wirsbo Rohrproduktion Und Vertriebs-Gmbh filed Critical Wirsbo Rohrproduktion Und Vertriebs-Gmbh
Priority to AU42984/97A priority Critical patent/AU4298497A/en
Publication of WO1998006519A1 publication Critical patent/WO1998006519A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C57/00—Shaping of tube ends, e.g. flanging, belling or closing; Apparatus therefor, e.g. collapsible mandrels
    • B29C57/02—Belling or enlarging, e.g. combined with forming a groove
    • B29C57/04—Belling or enlarging, e.g. combined with forming a groove using mechanical means
    • 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

Definitions

  • the invention relates to a spreading tool containing
  • a generally cylindrical expanding mandrel with an at least partially conical inner bore which is composed of a plurality of cylindrical sector-shaped expanding members
  • Such a spreading tool is described in the unpublished, older German patent application 195 04 868.3 and is used for the reversible widening of the ends of plastic tubes which are to be connected firmly and sealingly to a connecting part such as a pipe end or a pipe connector.
  • the object of the invention is to provide a spreading tool of the aforementioned type which fulfills the same purpose with less effort.
  • return means are provided between the actuating means and the expansion cone, which are preferably designed as return springs, in particular as disc springs.
  • the spreading tool is designed to be less expensive in terms of technology and price, without impairing its functionality.
  • Such a spreading tool serves for the reversible widening of the ends of plastic tubes, which can be firmly and sealingly connected to another tube or a tube connector during jerk deformation, cf. generally DE-OS 38 16 442, DE-OS 42 20 784, DE-Gb 84 04 512 and EP-A-0 618 142.
  • the expansion tool according to the invention is designed such that the expansion members have a recess between their free end and their holding part, which extends along the circumference of the expansion members. It is thereby achieved that the respective pipe end in the area of the recesses is widened uniformly with good approximation and the gaps running along the circumference, which form when the expanding mandrel is spread between the expansion members, have little or no influence on the expansion in the region of the recess.
  • the lower widening of the pipe end applied to the expanding mandrel in the region of the recess prevents the application of the Pipe end on the respective connecting part not or only slightly. Rather, this less widened area of the pipe end comes evenly into contact with the outer surface of the respective connecting part, as a result of which the desired firm and sealing connection is ultimately ensured.
  • the recess can also accommodate a ring made of an elastic material, a material that is self-deformable at room temperature, or a material that is comparable in terms of the deformation to that of the pipe end to be expanded. This not only facilitates the application of the widened pipe end to the respective connecting part, but also provides a restoring force for the expansion members after the expansion cone has been withdrawn.
  • the expanding tool is used with connecting parts, the connecting parts of which have at least one sealing edge, and if the at least one recess is aligned with the at least one sealing edge.
  • the recess on the expansion members can be arranged symmetrically to the sealing edge on the connecting part.
  • FIG. 1 shows a longitudinal section through the embodiment of the expanding tool according to the invention
  • FIG. 2 shows a cross section through the expanding tool according to FIG. 1 along the line II-II;
  • FIG. 3 shows a view of a connecting part for use with the expanding tool according to FIG. 1;
  • FIG. 4 shows a cross section through a modified design of the expanding mandrel in the expanding tool according to FIG.
  • FIG. 1 shows a long section of an exemplary embodiment of an expanding tool with a housing 1, which has actuating means actuated by pressure medium in the form of a single-acting piston-cylinder unit with a cylinder 2 and a piston 3 at one end, the piston 3 with an expanding means in the form of an expanding cone 4 cooperates.
  • actuating means can also be provided.
  • the pressure medium can be supplied to the housing 1 axially or radially.
  • the housing 1 can be provided with holding means which allow it to be held during operation, and it is designed in such a way that it can also be used for overhead work.
  • a generally cylindrical expanding mandrel 5 is attached in the opposite end of the housing 1.
  • This expanding mandrel 5 contains a conical inner bore 6 which, in the exemplary embodiment shown, extends from an inner end face 7 over the entire length of the expanding mandrel 5.
  • the inner bore 6 can also be designed so that it extends only over part of the length of the expanding mandrel 5 and merges into a cylinder bore that opens into the free end of the expanding mandrel 5.
  • the expanding mandrel 5 is provided with a chamfer 8, which can run at an angle of 5 ° to 20 ° to the peripheral surface of the expanding mandrel 5 and is preferably provided with rounded edges.
  • the chamfer 8 prevents damage to the inner wall of the pipe end into which the expanding mandrel 5 is inserted for expansion.
  • the expanding mandrel 5 is divided several times in the longitudinal direction and consists of a number of cylindrical sector-shaped expansion members 9; in the illustrated embodiment, cf. Figure 2, the expanding mandrel 5 is divided into eight expansion members 9. In the idle state or the unactuated state of the spreading tool, the spreading members 9 lie against one another in the circumferential direction and thus form a generally cylindrical outer surface.
  • each holding part consists of an arm 11 projecting radially from the periphery of the thickening 10, on the periphery of which a receptacle 12 is provided for a prestressing means, which for example forms an annular spring 13.
  • the ring spring 13 loaded acts a radially inward bias on the expansion members 9, whereby these are held in mutual contact in the unactuated state of the expanding mandrel 5 and the generally cylindrical shape of the expanding mandrel 5 is formed.
  • the radially projecting arms 11 are mounted in the associated end face of the housing 1 so as to be radially displaceable in a guide composed of a holding plate 14 and a bearing plate 15.
  • the guide can contain a sliding element 16 between the radial arms 11 and the holding plate 14 and / or the bearing plate 15; the surfaces of the holding plate 14 and the bearing plate 15 can instead be provided with incisions 17 in the adjustment region of the radial arms 11, as a result of which the surface adhesion between the parts in contact is reduced and their adjustability is improved.
  • the holding plate 14 is detachably fastened by screws to the end face of the housing 1, so that the expansion members 9 or the expanding mandrel 5 are arranged interchangeably in the end face of the housing 1 by means of the radial arms 11 and the holding plate 14.
  • each expanding member 9 Between the thickening 10 and the chamfer 8 of the expanding mandrel 5 there is a recess 18 on each expanding member 9, which forms a circumferential groove when the expanding mandrel 5 is not actuated.
  • the edges of the cutouts 18 are preferably beveled in order to avoid damage to pipe ends when the expanding mandrel 5 is inserted.
  • the spreading tool described above includes return means with which the expansion cone can be brought 4 after spreading from the inner bore 6 of the expanding mandrel 5 ⁇ back.
  • the piston 3 is provided with an extension 19 on the end facing the expansion cone 4, forming a shoulder 25, on which Return means are located, which in the illustrated embodiment are formed by disc springs 26, for which the shoulder 25 forms an abutment.
  • the free end of the extension 19 is screwed into a threaded bore 27 so that the piston 3 and the expansion cone 4 are connected to one another in the interior of the housing 1.
  • the disc springs 26 are located between the shoulder 25 on the piston 3 and the inner end face 7 of the expansion cone 4.
  • the displacement path of the expansion cone 4 and the expansion of the expansion mandrel 5 are achieved by the disc springs 26 bearing against an inner shoulder 28 of the housing 1 and the compression of the plate springs 26 limited. If desired, this displacement path can be reduced by a spacer sleeve which is placed on the extension 19 between the plate springs 26 and the inner end face 7 of the expansion cone 4.
  • the mechanically highly stressed parts such as the expanding cone 4 and the expanding members 9 of the expanding mandrel 5 are made from high-quality tool steel. In this way, on the one hand, the occurrence of friction and seizure points between the parts acting on one another and, on the other hand, deformation of the tension members 9 is avoided with high expansion forces.
  • the spreading tool is shown in the idle state.
  • the pressure-actuated piston 3 and also the expansion cone 4 connected to it via the extension 19 are withdrawn, the plate springs 26 are relaxed.
  • the expanding cone 4 is located in the conical inner bore 6 of the expanding mandrel 5 in a position in which no axially directed force on the Expanding mandrel 5 is exercised.
  • the expansion members 9 are in mutual contact, and the expansion mandrel 5 forms the generally cylindrical body shown in FIG.
  • the piston-cylinder unit After expansion, the piston-cylinder unit is relieved of the pressure medium pressure applied.
  • the prestressed disk springs 26 can act on the shoulder 25 of the piston 3 in such a way that the piston 3 and the expansion cone 4 connected to its extension 19 are withdrawn from the inner bore 6 of the expanding mandrel 5 until the disk springs 26 are released.
  • This displacement path is sufficient to loosen the expansion members 9 from the inner wall of the widened tube end to such an extent that the tube end can be easily removed from the expanding mandrel. 5 can be removed. Thereafter, the piston 3 together with the expansion cone 4 can be easily moved back into the rest position shown in the upper half of FIG. 1.
  • the expansion members 9 act on the inner wall of the pipe end, which is applied to the expanding mandrel up to the stop on the thickening 10.
  • the inner wall of the pipe end only comes into contact in the peripheral area of the expansion members 9, but not in the area of the gaps that develop between the adjacent expansion members 9 during the expansion process. This creates axially extending, inwardly projecting ribs on the inner wall of the pipe end.
  • the inner wall of the pipe end does not abut the expansion members 9 in the region of the cutouts 18. In this way, an inwardly projecting region or web of a height that is determined by the depth of the recess 18 also arises on this inner wall.
  • each connecting part 21 contains a holding element 22, which gradually falls to the free end of the pipe connector 20 and defines a sealing edge 24, which drops steeply to the other side.
  • the recesses 18 of the expansion members 9 are aligned with the axial position of the sealing edge 24 on the connecting part 21, to which the reversibly widened pipe end is applied.
  • the recesses 18 are preferably arranged symmetrically to the sealing edge 24, so that the webs remaining on the circumference of the inner wall of the pipe end after its widening are likewise formed symmetrically to the sealing edge 24 in the axial direction.
  • these webs are subjected to a temporary, likewise reversible deformation and then lie over the entire circumference of the connecting part 21 on both sides of the sealing edge 24.
  • a firm and sealing connection between the pipe end and the connecting part 21 is achieved at least in this area.
  • the connecting part 21 may optionally have more than one sealing edge; in this case, recesses 18 are provided on the expansion members 5 at corresponding locations.
  • FIG. 4 shows a modified embodiment of the expanding mandrel 5, the expanding members of which contain one, possibly also more than one, recess 18. A ring 29 is inserted into the recess.
  • the ring 29 advantageously only partially fills the recess 18. It consists of an elastic or self-deformable material at ambient temperature, possibly made of the same material as the pipe end to be expanded. As a result of the presence of the ring 27, a practically uniformly deformed area is formed in the area of the widened tube end, which, however, protrudes less far inwards than the web, which in the absence of the Rings 29 is formed. This makes it easier to push the widened pipe end onto the connecting part 21 without impairing the advantageous effects which are achieved by the presence of the web, that is to say the region which projects essentially from the inner circumference of the widened pipe end.
  • the ring 29 forms part of the prestressing means which hold the expansion members 9 together, because the ring 29 generates a restoring force acting on the expansion members 9 in addition to the ring spring 13 after the retraction of the expansion cone 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Coating Apparatus (AREA)

Abstract

L'expanseur comprend un boîtier (1) dans lequel peuvent coulisser dans le sens axial des organes de commande hydrauliques ou mécaniques prévus pour un cône d'écartement (4). Un mandrin extensible (5) est constitué de plusieurs membres écarteurs (9) qui figurent une béance partiellement conique (6) dans laquelle s'engage le cône d'écartement (4). L'avancement axial du cône d'écartement (4) provoque la divergence radiale des membres écarteurs, qui sont conduits par coulissage contre une précontrainte au bout du boîtier. Les organes de commande sont reliés au cône d'écartement. Les organes de retour, constitués de préférence de rondelles-ressort (26) prennent appui, à l'état de relâchement, contre une butée (25) des organes de commande et, d'autre part, contre une face frontale (7) du cône d'écartement; à l'état de tension, les rondelles-ressort sont comprimées entre la butée et l'épaulement intérieur (28) du boîtier.
PCT/EP1997/004366 1996-08-13 1997-08-12 Expanseur a dispositif de retour WO1998006519A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU42984/97A AU4298497A (en) 1996-08-13 1997-08-12 Expansion machine with a return device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29613985U DE29613985U1 (de) 1996-08-13 1996-08-13 Spreizwerkzeug mit Rückholvorrichtung
DE29613985.8 1996-08-13

Publications (1)

Publication Number Publication Date
WO1998006519A1 true WO1998006519A1 (fr) 1998-02-19

Family

ID=8027751

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/004366 WO1998006519A1 (fr) 1996-08-13 1997-08-12 Expanseur a dispositif de retour

Country Status (3)

Country Link
AU (1) AU4298497A (fr)
DE (1) DE29613985U1 (fr)
WO (1) WO1998006519A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001089736A1 (fr) * 2000-05-25 2001-11-29 Henning Ruud Dispositif de poussoir coulissant
FR2828125A1 (fr) * 2001-08-01 2003-02-07 Virax Sa Dispositif d'outil a expansion pour pince a emboiture
WO2009000966A1 (fr) * 2007-06-25 2008-12-31 Uponor Innovation Ab Procédé et outil pour élargir une extrémité de tuyau
US7922475B2 (en) 2006-12-28 2011-04-12 Virax, Société par actions simplifiée Expansion tool device for pliers or machine for producing sockets at the ends of pipes made out of plastic or composite material
CN111438284A (zh) * 2020-04-30 2020-07-24 中山联塑华通钢塑管有限公司 一种液压胀管装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008002265U1 (de) * 2008-02-18 2008-04-30 Novopress Gmbh Pressen Und Presswerkzeuge & Co. Kg Vorrichtung zum Aufweiten von Rohren
CN102513460A (zh) * 2011-12-16 2012-06-27 大连三高科技发展有限公司 扩径式钢管端部定径机
CN113275864A (zh) * 2021-06-09 2021-08-20 无锡市明通动力工业有限公司 一种散热管用撑孔装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH550036A (fr) * 1972-02-22 1974-06-14 Kugler Fonderie Robinetterie Appareil pour evaser l'extremite d'un tube.
WO1994018486A1 (fr) * 1993-02-05 1994-08-18 Wirsbo Bruks Ab Procede de production d'un raccordement de tuyau, et outil et manchon de raccord appropries pour appliquer ce procede
WO1995010000A1 (fr) * 1993-10-07 1995-04-13 Wirsbo Bruks Ab Procede et outil d'elargissement
DE19504968A1 (de) * 1995-02-15 1996-08-22 Wirsbo Rohrprod Und Vertr Gmbh Spreizwerkzeug für Kaltverformungen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH550036A (fr) * 1972-02-22 1974-06-14 Kugler Fonderie Robinetterie Appareil pour evaser l'extremite d'un tube.
WO1994018486A1 (fr) * 1993-02-05 1994-08-18 Wirsbo Bruks Ab Procede de production d'un raccordement de tuyau, et outil et manchon de raccord appropries pour appliquer ce procede
WO1995010000A1 (fr) * 1993-10-07 1995-04-13 Wirsbo Bruks Ab Procede et outil d'elargissement
DE19504968A1 (de) * 1995-02-15 1996-08-22 Wirsbo Rohrprod Und Vertr Gmbh Spreizwerkzeug für Kaltverformungen

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001089736A1 (fr) * 2000-05-25 2001-11-29 Henning Ruud Dispositif de poussoir coulissant
FR2828125A1 (fr) * 2001-08-01 2003-02-07 Virax Sa Dispositif d'outil a expansion pour pince a emboiture
WO2003011496A1 (fr) * 2001-08-01 2003-02-13 Virax S.A. Dispositif d'outil a expansion pour pince a emboiture
US7922475B2 (en) 2006-12-28 2011-04-12 Virax, Société par actions simplifiée Expansion tool device for pliers or machine for producing sockets at the ends of pipes made out of plastic or composite material
US8303295B2 (en) 2006-12-28 2012-11-06 Virax, Societe Par Actions Simplifiee Expansion tool device for pliers or machine for producing sockets at the ends of pipes made out of plastic or composite material
WO2009000966A1 (fr) * 2007-06-25 2008-12-31 Uponor Innovation Ab Procédé et outil pour élargir une extrémité de tuyau
US8562331B2 (en) 2007-06-25 2013-10-22 Uponor Innovation Ab Method and tool for expanding a pipe end
CN111438284A (zh) * 2020-04-30 2020-07-24 中山联塑华通钢塑管有限公司 一种液压胀管装置

Also Published As

Publication number Publication date
DE29613985U1 (de) 1996-11-14
AU4298497A (en) 1998-03-06

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