EP0215294A2 - Dispositif d'élargissement hydraulique de tubes - Google Patents

Dispositif d'élargissement hydraulique de tubes Download PDF

Info

Publication number
EP0215294A2
EP0215294A2 EP86111158A EP86111158A EP0215294A2 EP 0215294 A2 EP0215294 A2 EP 0215294A2 EP 86111158 A EP86111158 A EP 86111158A EP 86111158 A EP86111158 A EP 86111158A EP 0215294 A2 EP0215294 A2 EP 0215294A2
Authority
EP
European Patent Office
Prior art keywords
annular space
probe
pressure medium
receiving groove
pipe
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
EP86111158A
Other languages
German (de)
English (en)
Other versions
EP0215294B1 (fr
EP0215294A3 (en
Inventor
Herbert Krips
Miroslan Dr. Podhorsky
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.)
Balcke Duerr AG
Original Assignee
Balcke Duerr 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 Balcke Duerr AG filed Critical Balcke Duerr AG
Priority to AT86111158T priority Critical patent/ATE42226T1/de
Publication of EP0215294A2 publication Critical patent/EP0215294A2/fr
Publication of EP0215294A3 publication Critical patent/EP0215294A3/de
Application granted granted Critical
Publication of EP0215294B1 publication Critical patent/EP0215294B1/fr
Expired 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
    • B21D39/08—Tube expanders
    • B21D39/20—Tube expanders with mandrels, e.g. expandable
    • B21D39/203—Tube expanders with mandrels, e.g. expandable expandable by fluid or elastic material

Definitions

  • the invention relates to a device for the hydraulic expansion of pipe sections, preferably pipe ends within a pipe disk, by means of a cylindrical probe which can be inserted into the respective pipe and which, by means of at least two spaced-apart sealing rings, forms an annular space with the pipe section to be expanded, which is filled with pressure medium for expansion is, the two sealing rings are each arranged in an annular receiving groove of the probe, in the initial state when inserting the probe into the tube have an outer diameter which at most corresponds to the outer diameter of the probe and before the start of the expansion process to seal the annular gap between the probe and the tube by acting on it Pressure medium are expanded, which is supplied to the receiving grooves through a connecting line connected to the pressure medium supply.
  • the sealing rings arranged in receiving grooves have an outer diameter in the initial state which does not exceed the outer diameter of the cylindrical probe.
  • large forces are avoided when inserting the probe, which were caused by the friction between the sealing rings and the pipe to be expanded and could lead to damage to the sealing rings.
  • the sealing rings lying in the initial state within the outer surface of the probe must be widened. For this purpose, they are elastically expanded by applying pressure medium before the expansion process begins.
  • This expansion is achieved in that the sealing rings are acted upon on their inside with pressure medium, which is supplied to the respective receiving groove before the actual expansion process begins.
  • the sealing rings are pressurized with the aid of control slides which are arranged in the pressure medium supply and which first supply the pressure medium to the receiving grooves of the sealing rings before it is fed via a pressure medium line into the annular space sealed by the sealing rings between the probe and the pipe to be expanded.
  • the pressure medium supplied through parallel connecting lines to the receiving grooves of the sealing rings and the annular space should first be supplied to the annular space by different flow velocities in order to displace the air in the cavity before the sealing rings are to be widened by an increased flow velocity.
  • the invention has for its object to design a device of the type described in such a way that a reliable expansion of the sealing rings and thus sealing of the annular space is achieved before the actual expansion process begins, without the need for expensive and failure-prone control slides.
  • the solution to this problem by the invention is characterized in that the pressure medium supply to the annular space takes place exclusively via at least one of the receiving grooves and is controlled by the sealing ring serving as a valve body, which closes at least one opening formed between the receiving groove and the annular space until it is elastic Expanding has reached its sealing effect.
  • the device according to the invention thus does not require any control slide to be arranged in the probe, in order to achieve, after inserting the probe with sealing rings lying within its outer surface in the pipe section to be expanded, first of all sealing rings and thus sealing of the annular space before the actual expansion process by supplying pressure medium in the annulus begins. Since the pressure medium supply to the annulus is not, in contrast to the known devices Via one or more connecting lines, which are formed in addition to and parallel to the connecting lines to the receiving grooves in the probe, but exclusively via at least one of the receiving grooves, there is an inevitable consequence in the application of the sealing rings and the filling of the annular space, which leads to a reliable sealing effect of the sealing rings.
  • the sealing ring itself is used here as a valve body which closes the opening formed between the receiving groove and the annular space until it is widened to such an extent that it achieves a reliable sealing effect. Due to the design according to the invention, the device can also be used for the hydraulic expansion of pipe sections of pipes whose diameters fluctuate within a larger tolerance range and which have different roughnesses.
  • each receiving groove is sealed in the initial state by the sealing ring against the lateral surface of the probe and is provided on the side facing the annular space with at least one opening through which the receiving groove is connected to the annular space when the sealing ring is expanded.
  • the cross section of the sealing rings can be of any design; Various configurations are also conceivable for the formation of the openings between the receiving groove and the annular space.
  • the receiving groove has a U-shaped cross section; it is provided in its edge adjacent to the annular space with at least one oblique incision which forms the opening to the annular space which can be closed by the sealing ring.
  • the sealing ring has a circular cross section.
  • both receiving grooves can be provided in their edge adjacent to the annular space with a plurality of incisions evenly distributed over the circumference.
  • the opening between the annular space and the receiving groove can be formed by a peripheral chamfer on the side of the receiving groove facing the annular space.
  • the two receiving grooves with a chamfer on their edge facing away from the annular space, as a result of which an increased sealing effect of the sealing rings, which are preferably in the form of D-rings, is achieved when these are expanded during the expansion process with the increased pressure of the pressure medium located in the annular space be charged.
  • FIG. 1 shows the end of a tube 2 inserted into a bore of a tubular disk 1, which is to be expanded hydraulically for pressure-tight fastening in the tubular disk 1.
  • This hydraulic expansion is carried out with the aid of a device which comprises a probe 3 to be inserted into the pipe end to be expanded.
  • this probe 3 has a circular cylindrical shape, the outer diameter of which is slightly smaller than the inner diameter of the pipe 2 to be expanded.
  • two sealing rings 4 are arranged in the probe 3, which in the exemplary embodiment have a circular cross section and consist of elastic material, preferably rubber or plastic. Due to the spaced-apart sealing rings 4 in the probe 3, an annular space 5 is formed with the pipe section to be expanded, which is filled with pressure medium to expand the corresponding pipe section.
  • a liquid, preferably water, is used as the pressure medium.
  • the pressure required to expand the pipe section is of the order of 3000 bar.
  • Each sealing ring 4 is arranged in a receiving groove 6 which, in the exemplary embodiment, has a U-shaped cross section, as can be seen in particular from FIGS. 3 to 8.
  • the outer diameter of the sealing rings 4 corresponds at most to the outer diameter of the probe 3; in the exemplary embodiment, it is slightly smaller than the outer diameter of the probe 3.
  • the sealing rings 4 are therefore within the lateral surface of the probe 3 when it is pushed into the end of the tube 2 to be widened as shown in FIG. This situation is shown for a sealing ring in Figures 3 and 7.
  • the sealing rings 4 lying in the receiving grooves 6 are expanded.
  • the annular receiving grooves 6 are each connected to the pressure medium supply 8 by means of at least one connecting line 7, which is shown in the embodiment in the form of a central bore in the probe 3 and leads to a pressure medium source not shown in the drawing.
  • the pressure medium supplied via the connecting line 7 to the respective receiving groove 6 leads to an expansion of the Sealing ring 4 so that it rests on the inside of the pipe 2 to be expanded and thereby seals the annular space 5.
  • each receiving groove 6 is provided with four openings on the side facing the annular space 5, which in the exemplary embodiment are each formed by an oblique incision 9 in the edge of the receiving groove 6 but also by a different type of passage can be formed.
  • These incisions 9 are closed in the initial state by the sealing ring 4, which rests sealingly on the mutually opposite surfaces of the U-shaped receiving groove 6 in cross section, as long as it is not pressurized. Only when, according to FIG. 4, the sealing ring 4 has been expanded by the application of pressure medium and is in contact with the inner surface of the pipe 2 to be expanded, are the cuts 9 released, as shown in FIG. 5.
  • the sealing rings 4 thus serve as valve bodies for the incisions 9 leading as openings to the annular space 5.
  • the pressure medium is supplied to the annular space 5 exclusively via these incisions 9.
  • a further connecting line between the annular space 5 and the pressure medium supply 8 is not provided in the probe 3.
  • FIG. 5 shows that the sealing ring 4 is reliably pressed onto the inner surface of the pipe 2 to be expanded even during the supply of the pressure medium to the annular space 5, so that it ensures a secure sealing of the annular space 5 even at high pressures.
  • the pipe section lying in the tubular disk 1 can thus be hydraulically expanded by applying a high pressure, as shown in the illustration in FIGS. 5 and 8. After the expansion process has ended, the pressure is released and the pressure drained medium.
  • the sealing rings 4 return to their starting position due to their inherent elasticity, in which they lie according to FIG. 6 within the respective receiving groove 6, so that the probe 3 can subsequently be pulled out of the tube 2 without difficulty.
  • FIGS. 7 and 8 show a second embodiment in which the receiving groove 6 is provided with a chamfer 10 on its edge facing away from the annular space 5.
  • the sealing ring 4 which is circular in the initial state, is pressed onto this chamfer 10, which extends over the entire circumference, when the full pressure has been built up for the hydraulic expansion process, as shown in FIG.
  • the opening between the receiving groove 6 and the annular space 5 is formed by a peripheral chamfer 9a, which is formed in the side of the receiving groove 6 facing the annular space 5.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Heat Treatment Of Articles (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Soil Working Implements (AREA)
EP86111158A 1985-09-12 1986-08-12 Dispositif d'élargissement hydraulique de tubes Expired EP0215294B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86111158T ATE42226T1 (de) 1985-09-12 1986-08-12 Vorrichtung zum hydraulischen aufweiten von rohrabschnitten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3532499A DE3532499C1 (de) 1985-09-12 1985-09-12 Vorrichtung zum hydraulischen Aufweiten von Rohrabschnitten
DE3532499 1985-09-12

Publications (3)

Publication Number Publication Date
EP0215294A2 true EP0215294A2 (fr) 1987-03-25
EP0215294A3 EP0215294A3 (en) 1987-09-30
EP0215294B1 EP0215294B1 (fr) 1989-04-19

Family

ID=6280738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86111158A Expired EP0215294B1 (fr) 1985-09-12 1986-08-12 Dispositif d'élargissement hydraulique de tubes

Country Status (5)

Country Link
EP (1) EP0215294B1 (fr)
JP (1) JPH0647204B2 (fr)
AT (1) ATE42226T1 (fr)
DE (1) DE3532499C1 (fr)
ES (1) ES2000889A6 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995008410A3 (fr) * 1993-09-21 1995-06-01 Metal Box Plc Perfectionnements relatifs au profilage d'articles

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19846323A1 (de) * 1998-10-08 2000-04-20 Alusuisse Lonza Services Ag Verfahren und Vorrichtung zum Umformen eines Hohlprofils o. dgl. Werkstückes auf dem Wege des Innenhochdruck-Umformens
DE19909949B4 (de) * 1998-10-08 2004-11-25 Alcan Technology & Management Ag Vorrichtung und Verfahren zum Umformen eines Hohlprofils od. dgl. Werkstückes auf dem Wege des Innenhochdruck-Umformens
DE19851326C1 (de) * 1998-11-06 2000-02-10 Alusuisse Lonza Services Ag Hohlprofil od. dgl. Werkstück zum Umformen durch Innenhochdruck, Verfahren zum Herstellen eines Profils aus Leichtmetall und Vorrichtung dafür
DE19932420C2 (de) * 1999-07-15 2003-04-24 Alcan Tech & Man Ag Verfahren und Werkzeug zum Verbinden zweier Formteile, Hohlprofil mit einends an ihm festliegendem Kupplungs- oder Flanschelement sowie Verwendung
DE19946010B4 (de) * 1999-08-05 2006-01-05 Alcan Technology & Management Ag Verfahren zum Umformen eines Ausgangsprofils od. dgl. Werkstückes mittels eines Innenhochdruckes sowie Profil und dessen Verwendung
DE19955506B4 (de) * 1999-11-18 2006-05-04 Alcan Technology & Management Ag Verfahren zum Umformen eines Ausgangsprofils od.dgl. Werkstückes sowie Profil dafür
DE10153224B4 (de) * 2001-10-31 2005-09-15 Alcan Technology & Management Ag Verfahren und Vorrichtung zum Formen und/oder Beschneiden eines Hohlkörpers aus einem Hohlprofil od.dgl. Werkstück
EP1447283A3 (fr) * 2003-02-17 2005-01-19 Alcan Technology & Management Ltd. Profilé creux et méthode de sa fabrication
DE102015114345A1 (de) * 2015-04-28 2016-11-03 Sms Group Gmbh Schrittweise wirksamer Rohrexpander sowie Verfahren zum schrittweisen Expandieren eines Rohrs
CN107262616A (zh) * 2017-07-13 2017-10-20 东方电气(广州)重型机器有限公司 核电站热交换器上焊制换热管与管板只胀不焊的连接工艺

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5550933A (en) * 1978-10-09 1980-04-14 Mitsubishi Heavy Ind Ltd Pipe expanding mandrel
DE3105712A1 (de) * 1981-02-17 1982-08-26 Wilfried 4630 Bochum Busse "verfahren zur druckdichten befestigung eines rohres in einem rohrboden o.dgl."
DE3203144A1 (de) * 1982-01-30 1983-08-11 Wilfried 4630 Bochum Busse Verfahren zur druckdichten befestigung eines rohres in einem rohrboden o.dgl.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995008410A3 (fr) * 1993-09-21 1995-06-01 Metal Box Plc Perfectionnements relatifs au profilage d'articles

Also Published As

Publication number Publication date
ATE42226T1 (de) 1989-05-15
JPS6263022A (ja) 1987-03-19
DE3532499C1 (de) 1986-11-20
EP0215294B1 (fr) 1989-04-19
ES2000889A6 (es) 1988-03-16
JPH0647204B2 (ja) 1994-06-22
EP0215294A3 (en) 1987-09-30

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