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EP0268735B1 - Procédé de réalisation d'une connexion pliée ou bordelée d'un tube avec une pièce de jonction - Google Patents

Procédé de réalisation d'une connexion pliée ou bordelée d'un tube avec une pièce de jonction Download PDF

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Publication number
EP0268735B1
EP0268735B1 EP19870109167 EP87109167A EP0268735B1 EP 0268735 B1 EP0268735 B1 EP 0268735B1 EP 19870109167 EP19870109167 EP 19870109167 EP 87109167 A EP87109167 A EP 87109167A EP 0268735 B1 EP0268735 B1 EP 0268735B1
Authority
EP
European Patent Office
Prior art keywords
area
carried out
internal stresses
folds
fold
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
EP19870109167
Other languages
German (de)
English (en)
Other versions
EP0268735A1 (fr
Inventor
Rainer Hess
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.)
LACO SA
Original Assignee
LACO SA
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 LACO SA filed Critical LACO SA
Publication of EP0268735A1 publication Critical patent/EP0268735A1/fr
Application granted granted Critical
Publication of EP0268735B1 publication Critical patent/EP0268735B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • 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
    • B21D39/06—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes in openings, e.g. rolling-in

Definitions

  • the invention described here relates to a method for the folded or flanged connection of a pipe part to a connecting part or the like according to the preamble of claim 1 (DE-A-2 323 951).
  • the object of the invention described here is to design and develop the known processes, in particular the process known from DE-A-36 17 760.1, in such a way that such a folded or flanged connection can be carried out as easily as possible in terms of the device without losing a desired determinability, for example with regard to the fold which is initially formed and with regard to the size of the respective fold.
  • an area, a "web" remains between the two fold areas, the properties of which differ from those of the areas in which the folds are supposed to form, which essentially corresponds in its properties to the larger area spanning the fold area, the properties in this area being determined by the internal stresses generated.
  • the necessary generation of the residual stresses can be carried out in very different ways.
  • a corresponding warming-up of the tube part is possible in the area overlapping the fold area with subsequent quenching.
  • the temperatures known for the respective materials are to be set, which lead to the corresponding structural reorganization, which cannot be completely reversed when quenched, as a result of which compressive or tensile stresses (in the non-heat-treated area) then occur in the tube wall.
  • the generation of the residual stresses is achieved in that the tubular part is expanded in the area overlapping the fold area and in that a stress relief annealing is carried out in the respective areas in which the folds are to be formed.
  • a hydraulic expansion as well as a mechanical expansion is possible, reference is made in particular to the description in the patent application P 36 04 994.8.
  • the stress relief annealing in the respective areas in which the folds are to be formed is carried out differently such that residual stresses remain at least in one area (in which a fold is to be formed). In this way it can be determined which area initially poses a fold during the connection process, reference being made in particular to the disclosure of patent application DE-A-36 17 760.1 with regard to the advantages associated therewith.
  • the stress relief annealing can be carried out in the context of the invention, for example, by rotating the tube part in front of a fixed heat source. It is advisable to choose the heat source and in particular the heat generated on the outer tube wall so that a geometrically precisely defined heat is achieved, which means that a (partial) stress relief annealing can be reliably set precisely in the areas in which the folds are to be formed . Accordingly, it is also essential that defined temperatures are generated in these areas on the pipe part, in order in the individual areas to be able to achieve different stress relief anneals.
  • the stress relief annealing can be carried out by means of a conventional gas burner known from a welding device.
  • the stress relief annealing can also be effected by inductive heating.
  • the procedure was such that the residual stresses were first reduced in a first report, in which a fold is to be formed, and then initially waited until this area was practically completely cooled again, and only then in the second area in which a fold was to be formed, the residual stresses were reduced.
  • This procedure ensures that practically the residual stresses that were originally applied remain in the remaining "web” with certainty.
  • a simultaneous procedure can be achieved in that shielding is carried out with respect to the remaining “web” or even corresponding cooling elements are assigned to this area.
  • the shielding can take place, for example, by means of a copper ring.
  • the drawing shows a pipe section 1, which for example could also be a curved pipe section (cf. DE-A-36 04 944.1), in a cross-sectional view, into which a mandrel 2 is inserted.
  • the mandrel 2 has an area of larger diameter 3 and an area of smaller diameter 4.
  • the transition area 5 of the mandrel 2, between the area 3 and the area 4 is designed like a shoulder and lies against a corresponding shoulder area 6 of the pipe section 1.
  • This shoulder region 6 results in a counter-holder for the printing tool 7.
  • the printing tool 7 can, for example, which is not shown in the drawing, be designed to be divided.
  • a telescopic sleeve can also be provided, for example, as described in detail in patent application P 36 17 760.1.
  • the sleeve-like tool and the pressure tool for the counter-holder are designed in a combined manner on the shoulder area 6, while a sleeve-like tool 8 and a tool 9 are each provided in a manner known per se at the front end area of the tube piece 1 .
  • the same training could of course also be chosen in the area of the counter bracket.
  • the pipe section 1 shown has, due to the expansion by means of the mandrel 2 in the area 10, not inconsiderable residual stresses. These residual stresses are reduced in the annular regions a and c, the reduction of the residual stresses in the region c being carried out to an increased extent, the region c also being chosen to be larger than the region a, so that the fold in the region c is first with a somewhat larger extent, which is described in detail in terms of its usefulness etc. in patent application P 36 17 760.1.
  • the area b remains as a “web” between the areas a and c and furthermore has the same or substantially the same residual stresses as the remaining areas of the expanded pipe part 10.
  • the method according to the invention not only makes the device described in patent application P 36 17 760.1 unnecessary, as described in detail, but, as already mentioned, there is also a much more elastic connection between the pipe part and the connecting part and less force is required for the rebate , ie less power required.
  • the countermeasure was that region a was first annealed without stress, then this region was allowed to cool until it was practically cooled again.
  • the area c was then annealed without stress, in each case to the extent described above. Care was taken to ensure that only a slight warming occurred in area b, at most to the extent that only a blue discolouration occurred. If the entire area, a, b and c together, has a dimension of approximately 60 mm, then the first area a can have a dimension of approximately 20 mm, the area of 12 mm and the area c the remaining dimension.
  • these aforementioned dimensions are only examples and correspond to a test carried out in the workshop.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (5)

  1. Procédé pour réaliser une connexion pliée ou bordelée d'une pièce tubulaire métallique (1) avec une pièce de jonction ou élément similaire qui présente une embase enserrant sensiblement la pièce tubulaire (1) et coopérant avec celle-ci, des plis coopérant avec l'embase étant réalisés de chaque côté de la pièce de jonction par une sollicitation axiale et un guidage radiale dans la pièce tubulaire (1), caractérisé en ce qu'avant la sollicitation axiale, on effectue successivement les opérations suivantes:
    - création de contraintes internes dans la pièce tubulaire (1) uniquement dans les zones (a,c) dans lesquelles doivent être formés les plis, et dans la zone (b) située entre les deux précédentes, et
    - élimination au moins partielle des contraintes internes par recuit, dans les zones (a,c) dans lesquelles doivent être formés les plis.
  2. Procédé selon la revendication 1, caractérisé en ce que la création de contraintes internes s'effectue par évasement.
  3. Procédé selon la revendication 1, caractérisé en ce que la création de contraintes internes s'effectue par chauffage, puis refroidissement brusque.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'élimination des contraintes internes dans les diverses zones de pliage (a,c) s'effectue avec des intensités différentes, des contraintes résiduelles subsistant dans au moins l'une des zones de pliage.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que le recuit s'effectue en faisant tourner la pièce tubulaire devant une source de chaleur fixe.
EP19870109167 1986-10-31 1987-06-26 Procédé de réalisation d'une connexion pliée ou bordelée d'un tube avec une pièce de jonction Expired - Lifetime EP0268735B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863637137 DE3637137A1 (de) 1986-10-31 1986-10-31 Verfahren zur gefalzten oder geboerdelten verbindung eines rohrteiles mit einem verbindungsteil
DE3637137 1986-10-31

Publications (2)

Publication Number Publication Date
EP0268735A1 EP0268735A1 (fr) 1988-06-01
EP0268735B1 true EP0268735B1 (fr) 1991-08-21

Family

ID=6312901

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870109167 Expired - Lifetime EP0268735B1 (fr) 1986-10-31 1987-06-26 Procédé de réalisation d'une connexion pliée ou bordelée d'un tube avec une pièce de jonction

Country Status (2)

Country Link
EP (1) EP0268735B1 (fr)
DE (2) DE3637137A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017121180B4 (de) 2016-09-16 2019-07-25 GM Global Technology Operations LLC Verfahren zum Abbau von Restspannung in angegossenen Laufbuchsen von HPDC-Motorblöcken

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02134338U (fr) * 1989-04-13 1990-11-07

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3728886A (en) * 1971-03-24 1973-04-24 Emerson Electric Co Method of producing precision tapered tubes
US3921754A (en) * 1973-03-29 1975-11-25 Rainer Hess Muffler having a connection between its disks and the tube lengths extending therethrough
US4130932A (en) * 1975-11-11 1978-12-26 Arkla Industries, Inc. Method of joining a tube to a plate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017121180B4 (de) 2016-09-16 2019-07-25 GM Global Technology Operations LLC Verfahren zum Abbau von Restspannung in angegossenen Laufbuchsen von HPDC-Motorblöcken

Also Published As

Publication number Publication date
DE3637137A1 (de) 1988-05-05
EP0268735A1 (fr) 1988-06-01
DE3772334D1 (de) 1991-09-26

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