EP0300318B1 - Dispositif pour rétreindre à froid l'extrémité d'un tube - Google Patents

Dispositif pour rétreindre à froid l'extrémité d'un tube Download PDF

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Publication number
EP0300318B1
EP0300318B1 EP88111065A EP88111065A EP0300318B1 EP 0300318 B1 EP0300318 B1 EP 0300318B1 EP 88111065 A EP88111065 A EP 88111065A EP 88111065 A EP88111065 A EP 88111065A EP 0300318 B1 EP0300318 B1 EP 0300318B1
Authority
EP
European Patent Office
Prior art keywords
tube
jaws
stop ring
pistons
annular body
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
EP88111065A
Other languages
German (de)
English (en)
Other versions
EP0300318A1 (fr
Inventor
Robert Weber
Helmut Mechtold
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT88111065T priority Critical patent/ATE67942T1/de
Publication of EP0300318A1 publication Critical patent/EP0300318A1/fr
Application granted granted Critical
Publication of EP0300318B1 publication Critical patent/EP0300318B1/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
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • B21D39/046—Connecting tubes to tube-like fittings

Definitions

  • the invention relates to a device for drawing in a pipe end by plastic cold forming according to the preamble of patent claim 1.
  • deformation is carried out by external pressure on the tubular surface by means of a plurality of kneading jaws arranged over the circumference of the tube, the internal longitudinal shape either being free or bound.
  • the inner surface takes on the shape of the inner tool, which can be cylindrical, conical or profiled.
  • the present invention has for its object to provide an on-site device for pulling a pipe end by cold forming, which is simple to use and can be used for different pipe diameters.
  • the device should be able to prepare the joints precisely in terms of dimensions.
  • the support body has an annular body and an inner tool centrally mounted thereon, designed as a stop ring connected pistons which can be moved radially towards the center by a pressure medium and the stop ring has individual stops which are formed from stop heads with threaded shafts which are screwed radially adjustably into radial threaded bores of the stop ring and have means for rotating the threaded shaft on the shaft end.
  • the ends of pipes in particular their inner diameters, can be adapted to one another very precisely at the joints, an accuracy in the range of tenths of a millimeter being achievable on site.
  • the stop ring designed as an internal tool so that it can be removed from the ring body.
  • the device can also be used without the inner stop ring, whereby the shape of the pipe end develops freely when it is pulled in.
  • the surfaces of the jaws acting on the tube end have an acute angle which opens away from the pipe end in the direction of the pipe axis. In this way, the pull-in forces can be kept very low.
  • the tube end is pulled inward in the manner of a negative tulip-like shape, the shape developing freely and being determined by the wall thickness of the tube and the tube material. It is particularly advantageous if the acute angle of the jaw surfaces is smaller than the angle of friction between the jaws and the pipe outer surface.
  • the individual cylinders are connected to one another by channels arranged in the ring body for supplying the pressure medium, and at least one cylinder is provided with connecting means for a flexible line leading to a pressure medium generator.
  • FIG 1 shows, in the device for pulling in the end of a tube 1 on a clamping body 2, an annular body 11 with piston 9 and a stop ring 6 designed as an internal tool are rotatably arranged with individual stops.
  • the single stops are made Stop heads 3 formed with threaded shafts 4.
  • these threaded shafts 4 are rotatably arranged in radial threaded bores 5 of a stop ring 6 into a desired position.
  • Means for rotating the threaded shaft are attached to each end of the shaft.
  • an internal polygon 7 is used for turning, into which an Allen key with ratchet can be inserted in order to make a continuous adjustment of the height of the stop heads 3.
  • the surface of the stop heads 3 facing the inner surface of the tube is spherical and preferably has the shape of a spherical surface.
  • the ring body 11, which is held centrally on the stop ring 6, has inwardly open, blind holes arranged in the shape of a cylinder and serving as cylinders 10.
  • the jaws 8 are each fastened to the pistons 9 by screws 12 and have a shoulder 13 which serves as a stop for the end of the tube 1 in the device.
  • the pistons 9 are provided with a return spring 18, one end of which is attached to the piston 9 and the other end of which is fastened to a plug 20 which can be screwed into the cylinder 10 and which seals it tightly on the side opposite the jaw 8. This training enables a particularly simple manufacture.
  • the individual cylinders 10 are connected to one another by channels 14 for supplying a pressure medium (part FIG. 2A). At least one of the cylinders 10 is provided with connecting means 15, for example in the form of a quick coupling, for a line 16 leading to a pressure medium generator (FIG. 1). If the piston 9 is pressurized with pressure medium, the jaws 8 coming into contact with the outer surface of the pipe press the pipe end inwards and thereby reduce the outer and inner diameter of the pipe end (part-FIG 2B).
  • the jaws 8 can have different shapes depending on the desired profile of the pipe end.
  • the surfaces of the jaws 8 which act on the tube end preferably have an acute angle ⁇ which opens away from the tube end in the direction of the tube axis.
  • the angle ⁇ is expediently smaller than the angle of friction between the jaws 8 and the outer surface of the tube 1.
  • the angle ⁇ is approximately 5 °.
  • the same number of stop heads 3 as that of the jaws 8 is preferably used.
  • the ring body 11, which is rotatably mounted on the clamping body 2, has an inner flange 11 a, which is guided in sliding surfaces of a ring 2 a and the clamping body 2.
  • the ring 2a is held by means of screws 2b on the clamping body 2, so that the device can also be used without a clamping body 2 by loosening the screws 2b.
  • the individual stop heads 3 are all set to the same setting dimension, so that the desired inside diameter for the tube is specified.
  • clamping screws 17, which are arranged on the clamping body 2, a rough adjustment is made for the tube 1.
  • the circular arc circumscribed by the tips of the clamping screws 17 is set slightly larger than the outside diameter of the pipe for pre-centering.
  • the movable line 16 is connected to a hand pump, the relief valve of which is initially open, so that the return springs 18 can retract the pistons 9 with the screwed-on jaws 8 into the position shown in FIG. 1 if this has not yet been done.
  • the device is then ready to be pushed onto the end of the tube 1.
  • the shoulder 13 limits the depth of the slide. Now the clamping screws 17 rotated inwards so far that they hold the pipe pulling device frictionally on the pipe end.
  • the relief valve on the hand pump can be closed and the device can be pressurized by actuating the hand pump until the inner surface of the pipe lies evenly on all stop heads 3 (lower half of FIG. 2). 6 visual holes 19 are provided on the stop ring for visual inspection.
  • the stop ring 6 can be removed from the ring body 11 by loosening the screws 11b.
  • Such a booster 21 can - as shown in FIG. 3 - be placed on one or more or all pistons 9 in a force-enhancing manner.
  • a cylinder 22 with a piston 23 is screwed into the upper opening 24 of the cylinder 10 arranged in the ring body 11 and the piston 23 is connected to the piston 9 via a piston rod 25.
  • the piston rod 25 is provided with bores 26, 27 through which the pressure medium guided into the cylinder 10 reaches channels 28, 29 and from there into the space of the cylinder 22.
  • a hydraulic unit is expediently used as the pressure medium generator.
  • boosters may also be necessary if the pull-in forces of the device are no longer sufficient due to the thick wall thickness of the pipe.
  • the boosters then load the pipe circumference with additional individual forces so that the pipe end can be pressed in there.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)
  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
  • Steroid Compounds (AREA)
  • Gripping On Spindles (AREA)
  • Jigs For Machine Tools (AREA)
  • Forging (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Holders For Apparel And Elements Relating To Apparel (AREA)
  • Metal Extraction Processes (AREA)

Claims (8)

  1. Appareil pour rétreindre l'extrémité d'un tube par déformation plastique à froid et dans lequel il est prévu un outil intérieur (3 à 7), qui détermine le profil intérieur désiré du tube et, sur un corps de support, plusieurs mâchoires (8) disposées extérieurement sur le pourtour de l'outil intérieur (3 à 7), caractérisé par le fait qu'il est prévu un corps de serrage, qui comporte un corps annulaire (11) et un outil intérieur monté de manière à être centré sur ce corps et agencé sous la forme d'un anneau de butée (6), le corps annulaire (11) possédant des trous borgnes s'ouvrant vers l'intérieur, qui sont utilisés à la manière de cylindres (10) et disposés en étoile et dans lesquels sont insérés des pistons (9) raccordés aux mâchoires (8) et déplaçables radialement vers le centre à l'aide d'un fluide comprimé, tandis que l'anneau de butée (6) comporte des butées individuelles qui sont formées par des têtes de butée (3) possédant des tiges filetées (4), qui sont vissées, d'une manière réglable radialement, dans des taraudages radiaux (5) de l'anneau de butée (6) et possèdent, sur leur extrémité, des moyens (7) pour faire tourner la tige filetée (4).
  2. Appareil suivant la revendication 1, caractérisé par le fait que l'anneau de butée (6) réalisé sous la forme d'un outil intérieur peut être retiré du corps annulaire (11).
  3. Appareil suivant la revendication 1 ou 2, caractérisé par le fait que les surfaces, qui agissent sur l'extrémité du tube, des mâchoires (8) font un angle aigu (α) qui s'ouvre à partir de l'extrémité du tube dans la direction de l'axe de ce dernier.
  4. Appareil suivant la revendication 3, caractérisé par le fait que l'angle (α) est inférieur à l'angle de frottement entre la mâchoire (8) et la surface extérieure du tube (1).
  5. Appareil suivant l'une des revendications précédentes, caractérisé par le fait que les différents cylindres (10) sont raccordés entre eux au moyen de canaux (14) ménagés dans le corps annulaire (11) et utilisés pour l'envoi du fluide comprimé, et qu'il est prévu au moins un cylindre (10) comportant des moyens de raccordement (15) pour une canalisation flexible (16) aboutissant à un générateur du fluide comprimé.
  6. Appareil suivant l'une des revendications précédentes, caractérisé par le fait que les pistons (9) sont équipés d'un ressort de rappel (18).
  7. Appareil suivant l'une des revendications précédentes, caractérisé par le fait qu'un amplificateur de pression (21) est monté sur un ou plusieurs pistons (9).
  8. Appareil suivant l'une des revendications précédentes, caractérisé par le fait que le corps annulaire (11) est monté de façon à pouvoir tourner sur un corps de serrage (2) équipé de vis de blocage (17).
EP88111065A 1987-07-22 1988-07-11 Dispositif pour rétreindre à froid l'extrémité d'un tube Expired - Lifetime EP0300318B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88111065T ATE67942T1 (de) 1987-07-22 1988-07-11 Geraet zum einziehen eines rohrendes durch kaltverformen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3724309 1987-07-22
DE3724309 1987-07-22

Publications (2)

Publication Number Publication Date
EP0300318A1 EP0300318A1 (fr) 1989-01-25
EP0300318B1 true EP0300318B1 (fr) 1991-10-02

Family

ID=6332146

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88111065A Expired - Lifetime EP0300318B1 (fr) 1987-07-22 1988-07-11 Dispositif pour rétreindre à froid l'extrémité d'un tube

Country Status (7)

Country Link
US (1) US4899571A (fr)
EP (1) EP0300318B1 (fr)
JP (1) JPS6440124A (fr)
AT (1) ATE67942T1 (fr)
DE (1) DE3865262D1 (fr)
FI (1) FI880529A (fr)
NO (1) NO883273L (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100396186B1 (ko) * 2000-07-13 2003-08-27 최혁재 스웨이징 머신

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2999405A (en) * 1957-12-24 1961-09-12 Smith Corp A O Apparatus for radially compressing articles
GB1201693A (en) * 1967-09-01 1970-08-12 Kocks Wermelskirchen G M B H Apparatus for calibrating pipes
US3888103A (en) * 1971-01-25 1975-06-10 Robin Renshaw Forming apparatus
US3731518A (en) * 1971-05-26 1973-05-08 G Blocher Crimping die arrangement
US3795035A (en) * 1972-04-26 1974-03-05 Texaco Inc Mechanisms for swaging the ends of pipes
DE2313787A1 (de) * 1973-03-20 1974-10-03 Mecanica De Utilaje Medgidia I Verfahren und vorrichtung zum verengen von rohren
DE2650691C3 (de) * 1976-11-05 1980-01-24 G. Siempelkamp Gmbh & Co, 4150 Krefeld Vorrichtung zum Außenkalibrieren von Rohren
PL110440B1 (en) * 1977-02-03 1980-07-31 Osrodek Badawczorozwojowy Maszyn Hutniczych Tube pointer
US4472959A (en) * 1982-02-16 1984-09-25 Grotnes Metalforming Systems, Inc. Removable multi-die cartridge for shrink forming machine
DE3408070A1 (de) * 1984-03-05 1985-09-05 Kraftwerk Union AG, 4330 Mülheim Aufweitvorrichtung fuer rohrenden

Also Published As

Publication number Publication date
FI880529A (fi) 1989-01-23
NO883273D0 (no) 1988-07-22
JPS6440124A (en) 1989-02-10
DE3865262D1 (de) 1991-11-07
NO883273L (no) 1989-01-23
US4899571A (en) 1990-02-13
EP0300318A1 (fr) 1989-01-25
FI880529A0 (fi) 1988-02-05
ATE67942T1 (de) 1991-10-15

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