EP0347369A2 - Procédé et dispositif d'élargissement hydraulique de profils creux - Google Patents

Procédé et dispositif d'élargissement hydraulique de profils creux Download PDF

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Publication number
EP0347369A2
EP0347369A2 EP89730141A EP89730141A EP0347369A2 EP 0347369 A2 EP0347369 A2 EP 0347369A2 EP 89730141 A EP89730141 A EP 89730141A EP 89730141 A EP89730141 A EP 89730141A EP 0347369 A2 EP0347369 A2 EP 0347369A2
Authority
EP
European Patent Office
Prior art keywords
hollow profile
sealing
sealing ring
hollow
pressure
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.)
Withdrawn
Application number
EP89730141A
Other languages
German (de)
English (en)
Other versions
EP0347369A3 (fr
Inventor
Gerd Dr.-Ing. Vogt
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0347369A2 publication Critical patent/EP0347369A2/fr
Publication of EP0347369A3 publication Critical patent/EP0347369A3/fr
Withdrawn legal-status Critical Current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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/045—Closing or sealing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B5/00—Presses characterised by the use of pressing means other than those mentioned in the preceding groups
    • B30B5/02—Presses characterised by the use of pressing means other than those mentioned in the preceding groups wherein the pressing means is in the form of a flexible element, e.g. diaphragm, urged by fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B7/00—Presses characterised by a particular arrangement of the pressing members
    • B30B7/04—Presses characterised by a particular arrangement of the pressing members wherein pressing is effected in different directions simultaneously or in turn

Definitions

  • the invention relates to a method for the hydraulic expansion of hollow profiles according to the preamble of claim 1 and a device for performing this method.
  • Hollow profiles in this sense are tubular bodies made of metallic materials, in particular steel, which can have any cross-sectional shape.
  • Components are often required for mechanical engineering purposes, which are designed as elongated, possibly also curved bodies, the cross-sectional shape of which changes significantly along their length. In many cases, for reasons of weight, one is interested in designing these components as hollow bodies. In order to keep the manufacturing outlay low, it has already been proposed to choose a tubular semi-finished product as the starting material and to achieve the desired final shape by expanding the starting material.
  • the known method requires a high level of equipment and is not suitable for the production of components which are curved or angled along their longitudinal extent. It is of particular importance, however, that the position of the sealing of the hollow profile for the hydraulic expansion requires precise preprocessing of the sealing surfaces on the semi-finished product and an exact matching of the piston geometry to the semi-finished product dimensions. The respective tolerances in the manufacture of semi-finished products can lead to processing problems.
  • the object of the invention is therefore to propose a method for the hydraulic expansion of hollow metal profiles, which can be carried out as simply as possible and in which, in particular, the sealing of the hollow profile is carried out without great expenditure on devices.
  • the sealing ring is also chambered in the sealing head in such a way that, due to the internal pressure, it can only expand in the direction of the outer or inner surface of the hollow profile to be sealed and there comes to a tight contact.
  • the chambering of the sealing ring therefore means that the elastic material cannot escape laterally. Since the hydraulic expansion pressure is also present in the sealing gap, it is provided according to the invention that the internal pressure in the sealing ring is always kept above this expansion pressure to such an extent that the contact pressure of the sealing ring on the surface of the hollow profile is always above the expansion pressure and a secure seal is thus ensured. Due to the elasticity, the sealing ring is able to easily accommodate manufacturing tolerances with regard to dimensions and surface properties.
  • the side walls of the sealing ring chamber act as mechanical stops with regard to the expansion of the hollow body.
  • a stop must be provided on the outside as a separate support, especially since the sealing pressure is higher than the actual expansion pressure anyway.
  • the sealing pressure can be set in such a way that the sealing pressure is continuously increased in accordance with the increase in the expansion pressure. It is expedient in each case 10-20% above the current expansion pressure.
  • the sealing function is guaranteed, since the elastic parts of the sealing ring also come into close contact with one another as soon as they are subjected to sufficient internal pressure.
  • the sealing heads are not pushed away in the axial direction from the hollow profile to be expanded by the expansion pressure, they must be held by appropriate counterforces. According to the invention, this is done by tension elements which connect the opposing sealing heads to one another. These tension elements can be attached outside the hollow profile, but can also lie in this. Flexible, i.e. Bendable internal tension elements (e.g. rope or chain) are used advantageously if the hollow profile to be expanded originally has a straight shape (e.g. circular cylindrical tube) and is to be converted into a curved final shape. In this case, the end regions of the tube, which are closed with the sealing heads, must be able to move locally, which is made possible by the flexibility of the tension elements. In other cases, it will be useful to integrate the holder for the sealing heads in the outer tool.
  • Flexible, i.e. Bendable internal tension elements e.g. rope or chain
  • FIG. 1 shows an axial longitudinal section through a hollow profile with two external sealing heads and an external tool
  • FIG. 2 shows an example for an internal sealing head with external support of the hollow profile. Parts with the same reference symbols have the same function in both figures.
  • the hollow profile 1, e.g. a cylindrical steel tube is closed on its end faces by two outer sealing heads 2a, 2b.
  • the outer sealing heads 2a, 2b are rigid (with a view to deformation due to the expansion pressure p2) and have an opening designed as a blind hole, the jacket contour of which corresponds approximately to that of the hollow profile 1 to be expanded.
  • An annular chamber 11 is embedded in the lateral surface of this opening, which is open towards the outer surface of the hollow profile 1 and receives a sealing ring 3 made of elastic materials.
  • the sealing ring 3 is hollow on the inside and connected to a hydraulic pressure source (pressure accumulator 7). As soon as the sealing ring 3 is subjected to the internal pressure p 1, its outer shape is changed.
  • the annular chamber 11 closely surrounds the sealing ring 3 on three sides, it can only expand in the direction of the outer surface of the hollow profile 1 and fit tightly against it. In this way, the annular gap 6 between the outer surface of the hollow profile 1 and the outer surface of the opening in the sealing head 2a, 2b is sealed.
  • the two sealing heads 2a, 2b are connected to each other by the tension element 5 (eg rod, rope, chain) in such a way that they are expanded by the expansion pressure p2, which can be introduced into the hollow profile 1 through the outer sealing head 2a through a supply line from the pressure accumulator 8 , cannot be pushed outwards, i.e. cannot move on the hollow section 1.
  • the actual deformation area of the hollow profile 1 is enclosed by an external tool 4, which defines the external shape of the expanded hollow profile.
  • the operation of the device is that, at the beginning of the process, the sealing rings 11 are initially subjected to internal pressure p 1 and are brought to bear tightly against the outer surface of the hollow profile 1. Only then is hydraulic pressure generated in the interior of the hollow profile 1. While the pressure p2 is increased, it is ensured that the pressure p1 is always greater than p2, so that the sealing effect is retained.
  • inner sealing heads 9 can also be used, which ensure that the sealing head 9 is sealed off from the inner surface of the hollow profile 1.
  • the function of the sealing ring 3 is completely in accordance with that in Figure 1, i.e. the outwardly open annular chamber 11 only allows the sealing ring 3 to expand outwards onto the inner surface of the hollow profile 1. Since the hollow profile 1 would expand p 1 under the effect of the sealing pressure, it is necessary in this case to provide an external support 10 for the hollow profile 1 separately.
  • the process according to the invention has the advantage that it can be carried out with little expenditure on equipment. It also enables the production of expanded hollow profiles, the longitudinal axis of which is curved, even if a straight semifinished product is used as the starting material.
EP19890730141 1988-06-16 1989-06-12 Procédé et dispositif d'élargissement hydraulique de profils creux Withdrawn EP0347369A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3820952A DE3820952A1 (de) 1988-06-16 1988-06-16 Verfahren und vorrichtung zum hydraulischen aufweiten von hohlprofilen
DE3820952 1988-06-16

Publications (2)

Publication Number Publication Date
EP0347369A2 true EP0347369A2 (fr) 1989-12-20
EP0347369A3 EP0347369A3 (fr) 1990-10-17

Family

ID=6356940

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890730141 Withdrawn EP0347369A3 (fr) 1988-06-16 1989-06-12 Procédé et dispositif d'élargissement hydraulique de profils creux

Country Status (5)

Country Link
US (1) US4951492A (fr)
EP (1) EP0347369A3 (fr)
JP (1) JPH0284219A (fr)
KR (1) KR900000138A (fr)
DE (1) DE3820952A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4103078A1 (de) * 1991-02-01 1992-08-06 Eichelberg & Co Gmbh H D Vorrichtung zum hydrostatischen umformen von hohlkoerpern aus kaltumformbarem metall
WO1992013655A1 (fr) * 1991-02-01 1992-08-20 Hde Metallwerk Gmbh Dispositif de formage hydrostatique de corps creux en metal deformable a froid
DE4103082A1 (de) * 1991-02-01 1992-08-27 Eichelberg & Co Gmbh H D Verfahren zum hydrostatischen umformen von hohlkoerpern aus kaltumformbarem metall und vorrichtung zur durchfuehrung des verfahrens
FR2717409A1 (fr) * 1994-03-16 1995-09-22 Babcock & Wilcox Co Mandrin flexible d'expansion hydraulique.
WO1999025505A2 (fr) * 1997-11-14 1999-05-27 Mannesmann Ag Procede et dispositif pour reduire les frictions de paroi lors d'un processus de formage par haute pression interieure

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5353618A (en) 1989-08-24 1994-10-11 Armco Steel Company, L.P. Apparatus and method for forming a tubular frame member
DE4337517A1 (de) * 1993-11-03 1995-05-04 Klaas Friedrich Verfahren zum Innenhochdruck-Umformen von hohlen abgesetzten Wellen aus kaltumformbarem Metall
US5992197A (en) * 1997-03-28 1999-11-30 The Budd Company Forming technique using discrete heating zones
DE19751407C1 (de) * 1997-11-14 1999-07-15 Mannesmann Ag Verfahren und Vorrichtung zum hydraulischen Abdichten eines Hohlprofils
DE19812884C2 (de) * 1998-03-17 2002-02-07 Inpro Innovations Gmbh Verfahren zum Andocken eines Formkeils an verschweißte Blechplatinen zu deren Innenhochdruckumformen zu einem hohlen Bauteil und Vorrichtung zur Durchführung des Verfahrens
US6098437A (en) * 1998-03-20 2000-08-08 The Budd Company Hydroformed control arm
US6006568A (en) * 1998-03-20 1999-12-28 The Budd Company Multi-piece hydroforming tool
US6032501A (en) * 1999-02-09 2000-03-07 The Budd Company Method of hydroforming multi-lateral members from round tubes
US6209372B1 (en) 1999-09-20 2001-04-03 The Budd Company Internal hydroformed reinforcements
DE19957508C1 (de) * 1999-11-30 2001-01-04 Daimler Chrysler Ag Vorrichtung zum Fügen von Fügeteilen auf Hohlprofile mittels fluidischen Innenhochdruckes
DE10055607A1 (de) * 2000-11-09 2002-05-23 Daimler Chrysler Ag Mantelrohr einer Lenksäule eines Kraftfahrzeuges und ein Verfahren zur Herstellung des Mantelrohres
US6510720B1 (en) * 2001-10-18 2003-01-28 Hartwick Professionals, Inc. Hydraulic pressure forming using a self aligning and activating die system
US6536252B1 (en) 2002-02-19 2003-03-25 Babcock & Wilcox Canada Ltd. Non-metallic hydraulic expansion mandrel
CN1304136C (zh) * 2004-04-06 2007-03-14 东莞市永强汽车制造有限公司 封头成型设备
JP5710872B2 (ja) * 2009-09-29 2015-04-30 ヤマハ発動機株式会社 素材管の加工方法，素材管の加工装置及び加工管
DE102013109880B4 (de) 2012-09-10 2016-11-03 National Research Council Of Canada Reibungsarmer Endennachschub beim Innenhochdruckumformen
JP7155233B2 (ja) * 2018-02-23 2022-10-18 住友重機械工業株式会社 成形装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1930745A (en) * 1930-10-20 1933-10-17 Doherty Res Co Method and means for cold treating metal tubing
GB650333A (en) * 1947-04-25 1951-02-21 Robertshaw Fulton Controls Co Collets for establishing and maintaining a seal by the use of fluid under pressure
FR1245164A (fr) * 1959-01-09 1960-11-04 Procédé de fabrication de tubes ronds et dispositif pour l'exécution de ce procédé
DE1158934B (de) * 1953-09-17 1963-12-12 Baldwin Lima Hamilton Corp Vorrichtung zum Aufweiten eines Rohres
US3625040A (en) * 1969-08-06 1971-12-07 Koppy Tool Corp Method and apparatus for forming articles from a tubular blank

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA532335A (fr) * 1956-10-30 S. Schindler Frank Appareil pour le gaufrage annulaire des tubes metalliques
CH350946A (fr) * 1958-01-10 1960-12-31 Keelavite Company Limited Appareil pour former au moins un renflement dans une extrémité d'un tuyau
DE2935086C2 (de) * 1979-08-28 1982-04-01 Mannesmann AG, 4000 Düsseldorf Verfahren und Vorrichtung zur Herstellung von abgesetzten Hohlkörpern stark unterschiedlicher Querschnittsformen
US4751836A (en) * 1986-07-07 1988-06-21 Vetco Gray Inc. Pipe end conditioner and method
US4827748A (en) * 1988-07-11 1989-05-09 Cameron Iron Works Usa, Inc. Cold forming tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1930745A (en) * 1930-10-20 1933-10-17 Doherty Res Co Method and means for cold treating metal tubing
GB650333A (en) * 1947-04-25 1951-02-21 Robertshaw Fulton Controls Co Collets for establishing and maintaining a seal by the use of fluid under pressure
DE1158934B (de) * 1953-09-17 1963-12-12 Baldwin Lima Hamilton Corp Vorrichtung zum Aufweiten eines Rohres
FR1245164A (fr) * 1959-01-09 1960-11-04 Procédé de fabrication de tubes ronds et dispositif pour l'exécution de ce procédé
US3625040A (en) * 1969-08-06 1971-12-07 Koppy Tool Corp Method and apparatus for forming articles from a tubular blank

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4103078A1 (de) * 1991-02-01 1992-08-06 Eichelberg & Co Gmbh H D Vorrichtung zum hydrostatischen umformen von hohlkoerpern aus kaltumformbarem metall
WO1992013655A1 (fr) * 1991-02-01 1992-08-20 Hde Metallwerk Gmbh Dispositif de formage hydrostatique de corps creux en metal deformable a froid
DE4103082A1 (de) * 1991-02-01 1992-08-27 Eichelberg & Co Gmbh H D Verfahren zum hydrostatischen umformen von hohlkoerpern aus kaltumformbarem metall und vorrichtung zur durchfuehrung des verfahrens
DE4103079A1 (de) * 1991-02-01 1992-08-27 Eichelberg & Co Gmbh H D Vorrichtung zum hydrostatischen umformen von hohlkoerpern aus kaltumformbarem metall
US5279142A (en) * 1991-02-01 1994-01-18 Hde Metallwerk Gmbh Hydrostatically deforming a hollow body
US5303570A (en) * 1991-02-01 1994-04-19 Hde Metallwerk Gmbh Hydrostatically deforming a hollow body
FR2717409A1 (fr) * 1994-03-16 1995-09-22 Babcock & Wilcox Co Mandrin flexible d'expansion hydraulique.
WO1999025505A2 (fr) * 1997-11-14 1999-05-27 Mannesmann Ag Procede et dispositif pour reduire les frictions de paroi lors d'un processus de formage par haute pression interieure
WO1999025505A3 (fr) * 1997-11-14 1999-08-12 Mannesmann Ag Procede et dispositif pour reduire les frictions de paroi lors d'un processus de formage par haute pression interieure

Also Published As

Publication number Publication date
JPH0284219A (ja) 1990-03-26
DE3820952A1 (de) 1989-12-21
DE3820952C2 (fr) 1991-01-24
US4951492A (en) 1990-08-28
EP0347369A3 (fr) 1990-10-17
KR900000138A (ko) 1990-01-30

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