WO1996025255A1 - Outil expansible pour formage a froid - Google Patents

Outil expansible pour formage a froid Download PDF

Info

Publication number
WO1996025255A1
WO1996025255A1 PCT/EP1996/000501 EP9600501W WO9625255A1 WO 1996025255 A1 WO1996025255 A1 WO 1996025255A1 EP 9600501 W EP9600501 W EP 9600501W WO 9625255 A1 WO9625255 A1 WO 9625255A1
Authority
WO
WIPO (PCT)
Prior art keywords
tool according
spreading tool
expanding
expansion
mandrel
Prior art date
Application number
PCT/EP1996/000501
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 SK1103-97A priority Critical patent/SK110397A3/sk
Priority to EP96904006A priority patent/EP0809553A1/fr
Priority to JP8524630A priority patent/JPH11500358A/ja
Priority to PL96321799A priority patent/PL321799A1/xx
Priority to AU47881/96A priority patent/AU4788196A/en
Publication of WO1996025255A1 publication Critical patent/WO1996025255A1/fr
Priority to FI973328A priority patent/FI973328A/fi
Priority to NO973754A priority patent/NO973754L/no

Links

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 present invention relates to a spreading tool consisting of a generally cylindrical expanding mandrel which is provided with an at least partially conical inner bore and is divided in the axial direction into a plurality of essentially cylindrical sector-shaped expanding members, a holding part projecting from the outer circumference of each expanding member.
  • pretensioning means acting on the holding parts which pretension the expanding members in mutual contact with the generally cylindrical expanding mandrel, a housing in which the holding parts are guided in a radially displaceable manner, conical expanding means for engaging in the at least partially conical inner bore of the expanding mandrel, and actuating means for axially displacing the expanding means in the inner bore of the expanding mandrel while spreading the same against the force of the biasing means.
  • Such a spreading tool is known from German Offenlegungsschrift 42 20 794 and is used to widen the tubes of the reversibly deformable plastic tubes so that the tube ends can be firmly and sealingly connected to other tubes or a tube connector .
  • a similar spreading tool is known, for example, from published European patent application 0 619 152 and contains a cap which is connected to the spreading members by specially designed connecting and guiding means.
  • a connecting part is known from DE-OS 38 17 442 and from DE-G 94 04 513, which has at least one connecting part for connecting a reversibly widened pipe end.
  • the connecting part is provided with at least one holding element for the firm and sealing connection to the pipe end, which determines an inclined outer surface towards its free end and a steeply falling surface towards the opposite side.
  • the sloping outer surface makes it easier to push on the widened pipe end, while the steeply sloping surface together with the sloping outer surface determines a sealing edge which is important for the formation of the firm and sealing connection.
  • this object is achieved in that the expansion members have a recess between their free end and their holding part, which extends along the circumference of the expansion members.
  • the design of the expansion members according to the invention has the result that there is no non-uniform widening of the pipe end in the area of the cutouts, but rather that the pipe end is widened uniformly with good approximation. In this area, the widening of the pipe end is somewhat less, but this less widening hampers the application of the pipe end to the respective connecting part little or not at all. When the widened pipe end is pushed onto the respective connecting part, this area comes to bear much more evenly against the outer surface of the respective connecting part, as a result of which the desired firm and sealing connection is ensured in the end.
  • a ring made of a self-reshapable material is received in the recess and can essentially completely or partially fill the recess.
  • the ring material can be selected from an elastic material that is self-deformable at room temperature or from a material whose reshaping behavior is comparable to the material of the pipe end to be expanded; it can also be formed from a reinforced material.
  • a uniformly deformed area is also formed on the inner wall of the widened pipe end, but this projects less inward than the area which is formed in the absence of the ring. In comparison, this makes it easier to push the pipe end onto the connecting part.
  • the advantage of the uniformly deformed area is maintained, and the additional advantage is gained that the ring contributes to better cohesion of the expansion members and also provides a higher 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 the above-mentioned holding elements with a sealing edge and the cutouts on the expanding members are aligned with this sealing edge.
  • the axial arrangement of the recess on the expansion members can be such that the sealing edge on the holding element is arranged symmetrically with respect to the recesses. If necessary, more than one recess can be provided on the expanding mandrel and more than one sealing edge on the connecting part.
  • FIG. 1 shows a longitudinal section through a first 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 which can be used in connection with the spreading tool according to FIG. 1 or 4;
  • FIG. 4 shows a longitudinal section through a modified design of the spreading tool according to FIG. 1;
  • FIG. 5 shows a longitudinal section through a further embodiment of the spreading tool according to the invention.
  • FIG. 1 shows in longitudinal section a first exemplary embodiment of a spreading tool with a housing 1 which contains actuating means 2 for the spreading tool at one end.
  • the actuating means 2 contains a pressure-actuated piston 3, which is connected to an expanding means in the form of an expanding cone 4, for example by a screw connection.
  • the pressure medium-actuated piston 3 can also be provided his.
  • 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 such 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 an inner bore 6 made of a conical bore part 7, with which the expanding cone 4 is engaged or can be brought into engagement, and a cylindrical bore part 8 in its free end.
  • the expanding mandrel 5 is provided with a chamfer 9 which can run at an angle in the range from 5 ° to 20 ° to the peripheral surface of the expanding mandrel 5.
  • the edges that limit the chamfer 9 are rounded. The chamfer 9 and its rounded edges prevent damage to the inner wall of a pipe end 19 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 10; in the illustrated embodiment, cf. FIG. 2, the expanding mandrel 5 is divided into eight parts and thus consists of eight expanding members 10.
  • the expanding members 10 lie against one another in the circumferential direction and thus form a generally cylindrical peripheral surface.
  • each holding part consists of an arm projecting radially from the circumference of the thickening 11 12, on the circumference of which a receptacle 13 for a preloading means, for example an annular spring 14, is provided.
  • the annular spring 14 exerts a radially inward bias on the expansion members 10, whereby the expansion members 10 are held in mutual contact in the unactuated state of the expanding mandrel 5 and the generally cylindrical peripheral surface of the expanding mandrel 5 is formed.
  • the radially projecting arms 12 are mounted in the associated end face of the housing 1 so as to be radially displaceable in a guide comprising a holding plate 15 and a bearing plate 16 with a sliding element 17.
  • the holding plate 15 is detachably fastened to the end face of the housing 1 by means of screws, so that the expansion members 10 or the expanding mandrel 5 are interchangeably arranged in the end face of the housing 1 by means of the radial arms 12 and the holding plate 15.
  • each expanding member 10 Between the thickening 11 and the chamfer 9 of the expanding mandrel 5 there is a recess 18 on each expanding member 10, which in the closed or unactuated state of the expanding mandrel 5 is designed in the manner of a circumferential groove.
  • the edges of the cutouts 18 are preferably beveled in order to avoid damage to the pipe end 19 during insertion.
  • the mechanically highly stressed parts such as the expanding cone and the expanding members of the expanding mandrel, are made from a higher quality tool steel.
  • the spreading tool is shown in the idle state.
  • the spreading cone 5 only in the conical bore part 7 of the inner bore 6 of the expanding mandrel 5, without an axially directed force acting on the expanding cone 4.
  • the expansion members 10 are then in mutual contact, and the expansion mandrel 5 forms a generally cylindrical body, as shown in FIG.
  • FIG. 1 shows the expansion cone 4 in the end position of its displacement path, in which the maximum expansion of the expansion mandrel 5 is achieved. With this expansion, gaps extending in the longitudinal direction arise between the expansion members 10.
  • the expanding mandrel 5 when the expanding tool is at rest, it is inserted into a pipe end 19 made of a material which is preferably self-deformable at ambient temperature, for example of medium-density, high-density or cross-linked polyolefin.
  • the end face of the pipe end 19 comes to rest against the thickening 11, as a result of which the axial length of the pipe end 19 to be expanded is limited.
  • the expansion cone 4 is actuated, the expansion members 10 are pushed outwards against the force of the ring spring 14, as a result of which the tube end 19 is widened by a corresponding amount.
  • the inner surface of the pipe end 19 lies against the outer surface of the expanding mandrel 5, but not in the area of the above-mentioned axial gaps between the spreading members 10 which are pushed apart Ribs.
  • the The inner wall of the pipe end 19 does not adhere to the circumference of the expanding mandrel 5 when it is widened, even in the area of the cutouts 18. Accordingly, on the inner wall of the widened pipe end 19, an inwardly projecting region or web of a height is formed which is determined by the depth of the recess 18.
  • the connecting part can be designed, for example, as in the pipe connector according to G 94 04 513 and is shown in longitudinal section in FIG. 4.
  • the pipe connector 20 forms a straight piece of pipe which has connecting parts 21 at opposite ends.
  • Each connecting part 21 contains a holding element 22 for connection to a widened pipe end such as the pipe end 19.
  • Each holding element 22 contains an outer surface 23 which gradually slopes down to the free end of the pipe connector 21 and a sealing edge 24 which drops steeply to the other side.
  • the recesses 18 of the expansion members 10 are aligned with the axial position of the sealing edge 24 on the connecting part 21, to which the reversibly widened pipe end 19 is applied.
  • the sealing edge 24 is preferably arranged symmetrically to the cutouts 18, so that the webs remaining on the circumference of the inner wall after the widening of the pipe end 19 likewise run symmetrically to the sealing edge 24 in the axial direction.
  • these webs are subject to a short-term, likewise reversible deformation and then lie on the connecting part 21 on both sides of the sealing edge 24 over their entire circumference, as a result of which at least in this area a firm and sealing connection between the pipe end 19 and the connecting part 21 is achieved.
  • the connecting part 21 may optionally have more than one sealing edge 24; in this case, more than one recess 18 is provided on the expanding mandrel 5 at corresponding points.
  • Figure 4 is a representation corresponding to Figure 1 and shows a modified version of the spreading tool. The same parts are provided with the same reference numerals.
  • An expanding mandrel 25 contains a consistently conical inner bore 26 which extends over the entire axial length of the expanding mandrel 25. Otherwise, the expansion mandrel 25 is also composed of eight expansion members, which are held together under prestress by an annular spring 14.
  • the annular spring 14 is held in a receptacle 13 in radial arms 12, which start from a thickening 11 at the inner end of the expanding mandrel 25 and can be moved radially between a holding plate 15 and a bearing plate 16 with a sliding element 17 on the end face of the housing 1 are attached.
  • the expanding mandrel 25 has a chamfer 9 with rounded edges and between the chamfer 9 and the thickening 11 there is at least one recess 18 on the expansion members 10.
  • the function of the recesses 18 and the mode of operation of this expanding tool correspond to that described above in connection with Figures 1 to 3 has been described.
  • the longitudinal sectional view of FIG. 5 shows, from a further exemplary embodiment, only one expanding mandrel 27, the expanding members of which have one, possibly also more than one, recess 18.
  • the expanding mandrel 27 contains a ring 28 inserted into the recesses 18. Otherwise, the expanding tool is designed in accordance with FIGS. 1 and 2 or FIG.
  • the ring 28 completely or partially fills the recesses 18. It consists of an elastic material or a material that can be self-deformed at ambient temperature, possibly made of the same material as that of the pipe end to be expanded.
  • a practically uniformly deformed area is formed which extends over the inner wall of the tube and has the same effect as the corresponding area which is formed in the absence of the ring 28 .
  • this area protrudes less far inwards, which makes it easier to push the widened pipe end onto the respective connecting part 20 without the effects achieved by the presence of the uniformly deformed area being impaired.
  • the ring 28 forms part of the pretensioning means, since the presence of the ring 28 causes the expansion members of the expansion mandrel 27 to be held together and to be subjected to an additional restoring force after the expansion cone 4 has withdrawn.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Earth Drilling (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

La présente invention concerne un outil expansible comportant un mandrin expansible (5) cylindrique constitué par plusieurs éléments expansibles en forme de segments cylindriques (10) qui sont fixés et guidés, avec un élément de fixation, sur une face d'une enveloppe (1), de façon à pouvoir être remplacés. Le mandrin expansible (5) comporte un trou intérieur (6) en partie conique, dans lequel s'engage un cône expansible (4) qui agit en combinaison avec des organes d'actionnement (2). Ceux-ci font avancer le cône expansible (4) dans le trou intérieur (6) du mandrin expansible (5) pour élargir l'extrémité (19) d'un tube placé sur le mandrin expansible (5). En outre, à son extrémité libre, le mandrin expansible (5) présente un chanfrein (9). Au moins un renfoncement (18) s'étendant sur tout le périmètre du mandrin expansible (5) est situé entre ce chanfrein (9) et une partie épaissie (11) d'où part l'élément de fixation.
PCT/EP1996/000501 1995-02-15 1996-02-07 Outil expansible pour formage a froid WO1996025255A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
SK1103-97A SK110397A3 (en) 1995-02-15 1996-02-07 Expanding tool for cold-forming
EP96904006A EP0809553A1 (fr) 1995-02-15 1996-02-07 Outil expansible pour formage a froid
JP8524630A JPH11500358A (ja) 1995-02-15 1996-02-07 冷間成形のための広げ工具
PL96321799A PL321799A1 (en) 1995-02-15 1996-02-07 Tool for cold-flaring ends of pipes
AU47881/96A AU4788196A (en) 1995-02-15 1996-02-07 Expanding tool for-cold-forming
FI973328A FI973328A (fi) 1995-02-15 1997-08-14 Laajennustyökalu kylmämuokkausta varten
NO973754A NO973754L (no) 1995-02-15 1997-08-14 Ekspansjonsverktöy for kaldforming

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19504968A DE19504968A1 (de) 1995-02-15 1995-02-15 Spreizwerkzeug für Kaltverformungen
DE19504968.3 1995-02-15

Publications (1)

Publication Number Publication Date
WO1996025255A1 true WO1996025255A1 (fr) 1996-08-22

Family

ID=7753972

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/000501 WO1996025255A1 (fr) 1995-02-15 1996-02-07 Outil expansible pour formage a froid

Country Status (11)

Country Link
EP (1) EP0809553A1 (fr)
JP (1) JPH11500358A (fr)
AU (1) AU4788196A (fr)
CA (1) CA2211897A1 (fr)
DE (1) DE19504968A1 (fr)
FI (1) FI973328A (fr)
HU (1) HUP9801997A2 (fr)
NO (1) NO973754L (fr)
PL (1) PL321799A1 (fr)
SK (1) SK110397A3 (fr)
WO (1) WO1996025255A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11054076B2 (en) 2016-11-04 2021-07-06 Zurn Industries, Llc Reinforcing ring with sleeve
US11543065B2 (en) 2016-09-02 2023-01-03 Zurn Industries, Llc Extruded cold-expansion compression collar
US11541581B2 (en) 2016-09-02 2023-01-03 Zurn Industries, Llc Injection molded cold-expansion compression collar

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29613985U1 (de) * 1996-08-13 1996-11-14 Wirsbo Rohrprod Und Vertr Gmbh Spreizwerkzeug mit Rückholvorrichtung
US6439023B1 (en) * 2000-03-22 2002-08-27 General Electric Company Methods and apparatus for retrofitting compressible flanges
DE202008002265U1 (de) * 2008-02-18 2008-04-30 Novopress Gmbh Pressen Und Presswerkzeuge & Co. Kg Vorrichtung zum Aufweiten von Rohren
DE202008002266U1 (de) * 2008-02-18 2008-04-30 Novopress Gmbh Pressen Und Presswerkzeuge & Co. Kommanditgesellschaft Vorrichtung zum Aufweiten von Rohren
CH699306A1 (de) * 2008-08-13 2010-02-15 Finemon Ag Aufweitwerkzeug für Rohre und Rohrpresskupplung.
ES2948193T3 (es) * 2018-09-27 2023-09-01 Uponor Innovation Ab Herramienta de expansión

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3385087A (en) * 1966-02-18 1968-05-28 Huth Mfg Corp Swaging tool
US4198844A (en) * 1979-01-05 1980-04-22 J & S Hydraulics Inc. Tube expander
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3385087A (en) * 1966-02-18 1968-05-28 Huth Mfg Corp Swaging tool
US4198844A (en) * 1979-01-05 1980-04-22 J & S Hydraulics Inc. Tube expander
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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11543065B2 (en) 2016-09-02 2023-01-03 Zurn Industries, Llc Extruded cold-expansion compression collar
US11541581B2 (en) 2016-09-02 2023-01-03 Zurn Industries, Llc Injection molded cold-expansion compression collar
US11054076B2 (en) 2016-11-04 2021-07-06 Zurn Industries, Llc Reinforcing ring with sleeve

Also Published As

Publication number Publication date
CA2211897A1 (fr) 1996-08-22
JPH11500358A (ja) 1999-01-12
FI973328A0 (fi) 1997-08-14
AU4788196A (en) 1996-09-04
EP0809553A1 (fr) 1997-12-03
DE19504968A1 (de) 1996-08-22
NO973754D0 (no) 1997-08-14
FI973328A (fi) 1997-08-14
NO973754L (no) 1997-10-13
PL321799A1 (en) 1997-12-22
HUP9801997A2 (hu) 1998-12-28
SK110397A3 (en) 1998-01-14

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