EP0372360A2 - Procédé de fabrication de pièces tubulaires - Google Patents

Procédé de fabrication de pièces tubulaires Download PDF

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Publication number
EP0372360A2
EP0372360A2 EP89121939A EP89121939A EP0372360A2 EP 0372360 A2 EP0372360 A2 EP 0372360A2 EP 89121939 A EP89121939 A EP 89121939A EP 89121939 A EP89121939 A EP 89121939A EP 0372360 A2 EP0372360 A2 EP 0372360A2
Authority
EP
European Patent Office
Prior art keywords
hydroform
tube
pressure
expanding process
tubular construction
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Withdrawn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
EP89121939A
Other languages
German (de)
English (en)
Other versions
EP0372360A3 (fr
Inventor
Rainer Dipl.-Ing. Kuhn
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.)
Individual
Original Assignee
Individual
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
Priority claimed from DE19883840938 external-priority patent/DE3840938A1/de
Application filed by Individual filed Critical Individual
Publication of EP0372360A2 publication Critical patent/EP0372360A2/fr
Publication of EP0372360A3 publication Critical patent/EP0372360A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/18—Making hollow objects characterised by the use of the objects vessels, e.g. tubs, vats, tanks, sinks, or the like
    • 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
    • B21D53/00—Making other particular articles

Definitions

  • the invention relates to a method for producing tubular components, a tube being formed from a sheet and the two ends being welded to one another, and the tube thus obtained being subjected to an expansion process.
  • tubular components for example inner containers for dishwashers, oven tubes and tubes for microwave ovens. It is common practice to press the required recesses out of a sheet and to bend this deformed sheet into a rectangular tube, the ends of which are then welded together. This process is cumbersome and difficult to use.
  • Another known method for the production of tubular components consists in forming a tube by means of bending rounds starting from a sheet metal and then welding the two ends together.
  • the tube thus obtained is then mechanically expanded in a suitable device in order to obtain the bulges which are necessary in the finished baking oven, for example.
  • further shaping can take place in different stations in order to achieve the final shape.
  • This method has certain advantages over the first one described method, but it can not be used for many purposes because the manufacturing costs associated with this method are relatively high.
  • the invention has for its object to provide a method for producing tubular components with which inexpensive and reliable high-quality tubular components for example, baking ovens can be produced.
  • This object is achieved in that the tube is mechanically pre-expanded prior to the expanding process and that the pre-expanded tube is sealed and subjected to a hydroform expanding process while sealing its two ends.
  • a tube-like component close to the final shape is already produced during the pre-expansion.
  • Another embodiment of the invention is that a circumferential sealing ring is formed in the pipe to be expanded to seal the two pipe ends.
  • the two circumferential sealing rings are formed like a labyrinth.
  • the pressure required in the hydroforming expansion process is applied in stages up to the maximum pressure.
  • the pressure is applied in a pulsating manner up to the maximum pressure.
  • the pressurized water system provided for the hydroform expanding process is designed as a closed circuit in which the hydraulic pressure is changed with the aid of a separate oil circuit coupled to the pressurized water system.
  • hydroform expansion process is carried out with the aid of a core carrying the pressurized water and without the interposition of a rubber sack or a membrane that can be placed on the core.
  • Said mechanical deformation according to the invention can take place simultaneously with the hydroform expanding process, but it can also take place after or before the hydroform expanding process.
  • the advantages achieved by the invention are, in particular, that when the method is used there is considerable material savings with regard to the body to be produced and practically no waste is produced in the course of the production process. Furthermore, there are low tool costs for the changeover when different types of tubular components are manufactured. There is also no problem in using sheets of the most varied quality, for example normal deep-drawing steel and austenitic and ferritic stainless steel. Different sheet thicknesses can also be processed without any problems.
  • Fig. 1 The production line shown in Fig. 1 for the production of tubular components shows only the essential elements necessary for understanding the invention. For example, it is not shown that, starting from a sheet metal plate or from a bundle, a tube is produced by bending rounds. Incidentally, this tube, which serves as a preform for the tubular component to be produced, can have any shape in cross section. In the example shown, the tube 1 is circular in cross section, but it can also be square or rectangular, for example. In Fig. 1 is also not shown that the tube is welded together at its two ends after the bending round.
  • the tubular components 2 to be produced with a line according to FIG. 1 serve in particular as inner containers for dishwashers, oven tubes or, for. B. Tubes for microwave ovens.
  • FIG. 1 shows various stations 3 to 10, on which the tube 2 is made into the final tubular component 2 in different steps.
  • the preformed and welded tube arrives in station 3, in order then to be subjected to the mechanical expansion process according to the invention in station 4.
  • This pre-expansion preferably takes place in such a way that a tube-like component close to the final shape is already produced, as shown in FIG. 2.
  • a tube with a rectangular cross-section was produced from the circular tube, which already has approximately the shape as shown by the tubular component 2 in FIG. 4.
  • the weld seam between the two pipe ends is designated 11.
  • the pre-expanded pipe 1 is fed to station 5, in which the hydroform expansion process according to the invention takes place.
  • the station 5 is shown in somewhat more detail in FIGS. 6 and 7 in two views.
  • the first important step of the method according to the invention in station 5 is that the two ends 13 and 14 have a circumferential sealing ring 15.
  • the sealing rings to be molded at the two ends 13 and 14 are labyrinthine, as shown in FIG. 5.
  • This shaping of the circumferential sealing rings 15, in which the material remains undamaged in contrast to known methods, takes place with the aid of the matrices 16 (FIG. 6, FIG. 7) which can be adjusted in the direction of the core 17.
  • This first step in the hydroforming expansion process in station 5 is illustrated with reference to FIGS. 3 and 5, where the circumferential sealing rings 15 are shown at the ends 13 and 14.
  • a lock 18 engages so that the space 19 between the core 17 and the matrices 16, in which the component 1 to be expanded is located, is hermetically sealed.
  • the matrices 16 have corresponding depressions corresponding to the bulges to be attached to the tube 1. If water or a water-based emulsion is now supplied to the core 17 under high pressure via the line 20, the tube 1 is inserted into the depressions in the tube Matrices 16 expanded. This hydroform expanding process gives the tube 1 its essential shape as prescribed by the tubular component 2. In stations 6 to 10 in FIG. 1, the tubular component 1 is further processed until it can be removed as a finished component at the last station 21.
  • the pressure required in the hydroform expansion process in station 5 is applied in stages up to the maximum pressure, in particular in a pulsating manner, as is shown in FIG. 8.
  • This procedure brings excellent results in terms of dimensional accuracy and the formation of the bulge to be attached to the pipe 1; the pulsation of the pressure in the region 22 in FIG. 8 until the maximum pressure 23 is reached prevents the tube 1 from bulging out suddenly in the direction of the dies 16. Rather, the tube 1 is advantageously deformed step by step until it is finally shaped, the full contact of the tube 1 on the depressions in the matrices 16.
  • a special feature of the invention is that, contrary to the usual procedure in the hydroforming process, no rubber bag or membrane is provided between the core 17, the tube 1 to be deformed or the matrices 16.
  • the pressurized water reaches the pipe 1 to be deformed directly via the core 17 and presses the pipe 1 against the dies 16.
  • the high level of operational safety and the low maintenance costs when using the new method are also due to the fact that the pressurized water system 24 is designed as a closed circuit.
  • the hydraulic pressure to be changed in this system 24 is varied with the aid of a separate oil circuit 25 coupled to the pressurized water system 24 (FIG. 9).
  • an expansion cylinder 26 is connected between the two systems 24 and 25, each having a cylinder / piston system 27 and 28 for the water side and oil side.
  • two separate hydraulic circuits are available, which has great advantages:
  • the critical water side is limited to a minimum, so that you can get by with two water valves.
  • the costs for maintenance there are also essential positive aspects for the new method according to the invention.
  • FIG. 10 shows a tubular component which has been produced with the aid of the method according to the invention. It is characterized by the fact that practically two tube-like components have been produced in one work step without waste being produced. After the hydroform expansion process or the subsequent operations in stations 6 to 10, the two tubular components are separated from one another. This example underlines the high cost-effectiveness that results from the method according to the invention when manufacturing tubular components.
  • the described pre-expansion can be omitted if the properties of the material (sheet) to be shaped require it. For example, so much deformation may be necessary in the hydroform expansion process that pre-expansion is prohibited.
  • This object is achieved according to the invention in a method of the type specified in the introduction in that a mechanical deformation is superimposed on the hydroform expanding process.
  • the additional mechanical deformation according to the invention can take place simultaneously with the hydroform expanding process, but it can also, always in the hydroform expanding station, take place after or before the hydroform expanding process.
  • the deformation pressure for the hydroform expansion process can be reduced, which has great advantages for the water hydraulics.
  • the water pressure of the hydroform expansion process can take on a holding function as far as the pipe to be deformed is concerned.
  • the invention exists inter alia. in a combined process, a process with a hydroform expanding process and a mechanical deformation superimposed on this process.
  • FIGS. 6 and 7 schematically shows, starting from FIGS. 6 and 7, an apparatus for carrying out the method according to the invention.
  • the hydroforming expansion process has already been described, which consists essentially in that high pressure water is supplied to the core 17, as a result of which the tube 1 is expanded into the depressions 51 in the dies 16. the direction of action of the water coming from the core 17 is indicated by the arrows 52.
  • a mechanism can additionally be provided, which can consist, for example, of plungers 53.
  • plungers 53 for example sharp-edged profiles 54 and very narrow radii 55 realized.
  • the plungers 53 move in the direction of the double arrows 56.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP19890121939 1988-12-05 1989-11-28 Procédé de fabrication de pièces tubulaires Withdrawn EP0372360A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3840938 1988-12-05
DE19883840938 DE3840938A1 (de) 1988-12-05 1988-12-05 Verfahren zur herstellung von rohrartigen bauteilen
DE3906957 1989-03-04
DE3906957A DE3906957A1 (de) 1988-12-05 1989-03-04 Verfahren zur herstellung von rohrartigen bauteilen

Publications (2)

Publication Number Publication Date
EP0372360A2 true EP0372360A2 (fr) 1990-06-13
EP0372360A3 EP0372360A3 (fr) 1991-03-20

Family

ID=25874840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890121939 Withdrawn EP0372360A3 (fr) 1988-12-05 1989-11-28 Procédé de fabrication de pièces tubulaires

Country Status (2)

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EP (1) EP0372360A3 (fr)
DE (1) DE3906957A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4201819A1 (de) * 1991-01-28 1992-07-30 Mannesmann Ag Verfahren und vorrichtung zum hydraulischen aufweiten von rohrfoermigen hohlprofilen
DE4214557A1 (de) * 1992-04-28 1993-11-04 Mannesmann Ag Verfahren zum hydraulischen aufweiten von geschlossenen hohlprofilen
US6006568A (en) * 1998-03-20 1999-12-28 The Budd Company Multi-piece hydroforming tool
US6128936A (en) * 1998-09-09 2000-10-10 Kabushiki Kaisha Opton Bulging device and bulging method
DE10016025A1 (de) * 2000-03-31 2001-10-18 Hde Metallwerk Gmbh Verfahren zur Herstellung von großvolumigen Hohlkörpern
EP1184101A2 (fr) * 2000-08-29 2002-03-06 VAW Aluminium AG Procédé pour former des articles tubulaires creux métalliques
WO2003004190A1 (fr) * 2001-07-05 2003-01-16 Magna Structural Systems Inc. Procede d'expansion d'une ebauche tubulaire
DE102006012625A1 (de) * 2006-03-20 2007-09-27 Audi Ag Verfahren zur Herstellung von Profilen
WO2009027402A1 (fr) * 2007-08-31 2009-03-05 BSH Bosch und Siemens Hausgeräte GmbH Procédé de fabrication d'un appareil électroménager conduisant de l'eau

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310972A (en) * 1964-11-10 1967-03-28 Continental Can Co Moving hydraulic impulse metal forming device
CH462080A (fr) * 1968-01-30 1968-09-15 Contraves Ag Verfahren und Vorrichtung zum Anformen eines Ringwulstes an einer glattmanteligen Rohrleitung
DE2131811A1 (de) * 1971-06-23 1972-12-28 Siemens Elektrogeraete Gmbh Vorrichtung zum Tiefziehen rohrfoermiger Werkstuecke
FR2156092A1 (fr) * 1971-10-06 1973-05-25 Roper Corp
US3908854A (en) * 1971-05-10 1975-09-30 White Westinghouse Corp Dishwasher tub gasket surface
EP0234243A1 (fr) * 1986-02-27 1987-09-02 Zeltron Istituto Zanussi Per L'elettronica S.P.A. Méthode de fabrication d'une cuve de machine à laver de blanchisserie

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2541869A (en) * 1944-12-13 1951-02-13 Justin W Macklin Apparatus for making bellows

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3310972A (en) * 1964-11-10 1967-03-28 Continental Can Co Moving hydraulic impulse metal forming device
CH462080A (fr) * 1968-01-30 1968-09-15 Contraves Ag Verfahren und Vorrichtung zum Anformen eines Ringwulstes an einer glattmanteligen Rohrleitung
US3908854A (en) * 1971-05-10 1975-09-30 White Westinghouse Corp Dishwasher tub gasket surface
DE2131811A1 (de) * 1971-06-23 1972-12-28 Siemens Elektrogeraete Gmbh Vorrichtung zum Tiefziehen rohrfoermiger Werkstuecke
FR2156092A1 (fr) * 1971-10-06 1973-05-25 Roper Corp
EP0234243A1 (fr) * 1986-02-27 1987-09-02 Zeltron Istituto Zanussi Per L'elettronica S.P.A. Méthode de fabrication d'une cuve de machine à laver de blanchisserie

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4201819A1 (de) * 1991-01-28 1992-07-30 Mannesmann Ag Verfahren und vorrichtung zum hydraulischen aufweiten von rohrfoermigen hohlprofilen
DE4214557A1 (de) * 1992-04-28 1993-11-04 Mannesmann Ag Verfahren zum hydraulischen aufweiten von geschlossenen hohlprofilen
US6006568A (en) * 1998-03-20 1999-12-28 The Budd Company Multi-piece hydroforming tool
US6128936A (en) * 1998-09-09 2000-10-10 Kabushiki Kaisha Opton Bulging device and bulging method
DE10016025A1 (de) * 2000-03-31 2001-10-18 Hde Metallwerk Gmbh Verfahren zur Herstellung von großvolumigen Hohlkörpern
DE10016025B4 (de) * 2000-03-31 2005-06-16 Hde Solutions Gmbh Verfahren zur Herstellung von Hohlkörpern
US6826943B2 (en) 2000-08-29 2004-12-07 Hydro Alumunium Deutschland Gmbh Process for forming tube-shaped hollow bodies made of metal
EP1184101A3 (fr) * 2000-08-29 2002-12-11 VAW Aluminium AG Procédé pour former des articles tubulaires creux métalliques
EP1184101A2 (fr) * 2000-08-29 2002-03-06 VAW Aluminium AG Procédé pour former des articles tubulaires creux métalliques
WO2003004190A1 (fr) * 2001-07-05 2003-01-16 Magna Structural Systems Inc. Procede d'expansion d'une ebauche tubulaire
US7013697B2 (en) 2001-07-05 2006-03-21 Magna Structural Systems, Inc. Method for expanding a tubular blank
CN1313222C (zh) * 2001-07-05 2007-05-02 马格纳构造系统公司 用于膨胀管坯的方法
DE102006012625A1 (de) * 2006-03-20 2007-09-27 Audi Ag Verfahren zur Herstellung von Profilen
DE102006012625B4 (de) * 2006-03-20 2008-08-28 Audi Ag Verfahren zur Herstellung von Profilen
DE102006012625C5 (de) * 2006-03-20 2010-06-17 Audi Ag Verfahren zur Herstellung von Profilen
WO2009027402A1 (fr) * 2007-08-31 2009-03-05 BSH Bosch und Siemens Hausgeräte GmbH Procédé de fabrication d'un appareil électroménager conduisant de l'eau
US8783272B2 (en) 2007-08-31 2014-07-22 Bsh Bosch Und Siemens Hausgeraete Gmbh Method for manufacturing a water-bearing domestic appliance

Also Published As

Publication number Publication date
DE3906957A1 (de) 1990-09-06
EP0372360A3 (fr) 1991-03-20

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