EP0510759B1 - Procédé de fabrication de coudes de tuyaux à parois minces - Google Patents

Procédé de fabrication de coudes de tuyaux à parois minces Download PDF

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Publication number
EP0510759B1
EP0510759B1 EP19920201075 EP92201075A EP0510759B1 EP 0510759 B1 EP0510759 B1 EP 0510759B1 EP 19920201075 EP19920201075 EP 19920201075 EP 92201075 A EP92201075 A EP 92201075A EP 0510759 B1 EP0510759 B1 EP 0510759B1
Authority
EP
European Patent Office
Prior art keywords
gutter
blank
pipe bend
halves
cut
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
EP19920201075
Other languages
German (de)
English (en)
Other versions
EP0510759A1 (fr
Inventor
Rune Larsson
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.)
AP&T AUTOMATION & TOOLING AB
Original Assignee
Ap& t Automation & Tooling AB
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Filing date
Publication date
Application filed by Ap& t Automation & Tooling AB filed Critical Ap& t Automation & Tooling AB
Publication of EP0510759A1 publication Critical patent/EP0510759A1/fr
Application granted granted Critical
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Classifications

    • 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
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
    • B21C37/286—Making tube fittings for connecting pipes, e.g. U-pieces starting from sheet material

Definitions

  • the present invention relates to a method of producing a thin-walled pipe bend comprising the steps of producing halves for the pipe bend and joining together two halves for the formation of the pipe bend, the halves being formed into one another's mirror image in the plane of curvature of the pipe bend by forming an annular gutter in a skelp blank the gutter being given a profile, which substantially corresponds to the profile of one half.
  • US 2 192 471 discloses a method very similar to that of DE-C-355 286.
  • the point of departure is a starting material in the form of so-called skelp which is cut to parallel-trapezoidal blanks lying alternatingly in the longitudinal direction of the skelp strip.
  • Each one of these blanks is then employed for producing half of a pipe bend, in whih the halves are mirror images of one another, and consequently the pipe bend may be seen as divided along its plane of curvature. Two such halves are subsequently joined together in a suitable manner, for example by welding.
  • the prior art process suffers from numerous drawbacks, one of these residing in the relatively large material consumption which is caused by the fact that the halves for producing the pipe bend are employed in a pressing process, which requires a relatively large quantity of material surrounding the finally-shaped pipe bend half.
  • the present invention relates to a method of the type intimated by way of introduction, the method being devised so as to obviate the above-mentioned drawbacks.
  • the present invention relates to a method which, in particular, makes for the manufacture of pipe bends with an absolute minimum of material consumption, possibly in thinner material than has hitherto been possible, and with a minimum number of handling phases
  • the present invention further relates to a method which gives a finished product of superior quality and configurational accuracy.
  • the method intimated by way of introduction is characterized in that the blank is given a shape having scrap portions exteriorly and centrally of the gutter to be formed, that an opening is cut in the central scrap portion of the blank during the process of forming the gutter and that the halves are cut from the outer scrap strip of the blank and the central scrap portion.
  • the dimensions of the blank may be reduced further, since the hole-making entails that relatively more material is drawn from the region interiorly in the gutter, when this is formed, than would have been the case without the central hole.
  • the method is preferably also characterized in that the opening is cut towards the end of the process of forming the gutter, preferably when there is about 40% of the working stroke left.
  • the present invention is also suitably characterized in that, on division or splitting of the gutter, approximately radially directed bridges are left, these interconnecting parts of the blank located outside the gutter with parts of the blank located inside the gutter.
  • the present invention implies that those halves of which pipe bends are joined together are produced from the point of departure of a closed, annular gutter which has substantially the same profile or cross-sectional configuration as the pipe bend half.
  • the gutter has been produced by pressing of a preferably square or rectangular sheet metal blank which may be taken from a metal sheet or a roll.
  • a sheet metal blank 1 which may preferably have substantially square or rectangular form and which may be taken from rolled so-called skelp.
  • the employment of a square blank obviates the need for orientation of the blank.
  • the finished blank 1 is fed to a press device in which a gutter 2 is formed, this being annular and being given a cross-sectional configuration which is preferably semi-circular (if the pipe bend is to have circular cross-section), but which naturally may be of any other suitable shape for the production of a pipe bend.
  • the gutter 2 in the illustrated embodiment, consists of four arcuately curved portions 3 which are connected pairwise via straight portions 4.
  • the production of the gutter is effected by the application of a substantially conventional pressing process so that a scrap strip 5 is formed exteriorly about the gutter 2.
  • a scrap portion 6 will correspondingly be formed inside the gutter.
  • the scrap strip 5 and the scrap portion 6 substantially lie in a common plane, and that the gutter 2 is located wholly on one side of this plane.
  • a central opening 7 is, during the pressing operation (preferably towards the end of this operation), cut in the central scrap portion 6 of the blank 1.
  • this central opening In an intended pipe diameter of 120 mm in the finished pipe bend, it is appropriate to make this central opening when roughly 25 mm remains of the pressing movement in the tool, i.e. when approximately 40 per cent of the working stroke is left.
  • this central opening 7 affords the major advantage that the material which, during the pressing operation, forms the wall in the gutter 2 will, to a greater extent, be taken from the central portion of the blank than from its peripheral portion outside the gutter.
  • the dimensions of the blank 1 may be reduced so that the total material consumption will consequently be reduced to a corresponding degree.
  • the blank 1 has assumed the shape which is apparent from Figs. 1 and 2, the gutter itself is cut away from superfluous parts (i.e. the scrap strip 5 and the scrap portion 6) of the blank 1. Furthermore, the closed, annular gutter is divided into a number of halves, in Fig. 1 four in number, which are then joined together two-by-two, for example by welding, such that a complete pipe bend is formed.
  • the material saving which may be achieved according to the present invention amounts, in a pipe diameter of 120 mm, to approx. 15 per cent as compared with the prior art method of manufacture described by way of introduction using trapezoidal blanks. Since the forming of the gutter takes place wholly symmetrically, the material thickness in the blank employed can probably be reduced somewhat, possibly of the order of magnitude of between 10 and 20 per cent, whereby a further material saving may be achieved without running the risk of any deterioration in quality or other drawbacks.
  • the length of the straight portions 4 disposed in the gutter may naturally be varied within broad limits, depending upon the final shape of the contemplated pipe bend. In one extreme case, the straight portions 4 may possibly be eliminated entirely. In addition, the straight portions need not be of equal length at both of the ends of a half.
  • the annular gutter be given a corresponding configuration such that it has greater radial extent to every second cutting point 8 than to the remaining cutting points.
  • the radial extent could, for example, be 160 mm in the upper and lower cutting points 8 in the Figure (the profile here being thus a semi-circle with a radius of 80 mm), while the radial extent at the two horizontal cutting points could be 120 mm (the profile here being thus a semi-circle with a radius of 60 mm).
  • Such a dimensioning would result in a transition bend from 120 to 160 mm ⁇ .
  • Fig. 1 it has been assumed that the pipe bend is to be 90°, for which reason four halves are produced in one and the same ring.
  • the annular gutter is divided into a different number of parts than that shown on the Drawing.
  • the gutter may be divided into only two parts, which would result in a U-shaped pipe bend.
  • the division of the gutter may be effected in three points of division, which would result in a pipe bend with an angle of curvature of 120°.
  • the gutter may, of course, also be divided into a larger number of parts than those shown on the Drawing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Claims (5)

  1. Procédé de fabrication d'un coude pour tuyau à paroi mince, comprenant les étapes de production de demi-coudes pour le coude et de jonction mutuelle de deux demi-coudes pour la formation du coude, les demi-coudes étant mutuellement symétriques dans le plan de courbure du coude par formage d'une gouttière annulaire (2) dans une ébauche en feuille (1) de sorte que la gouttière ait un profil qui correspond sensiblement au profil d'un demi-coude, caractérisé en ce qu'on donne à l'ébauche (1) une configuration comportant des parties en excès ou de chute (5,6) à l'extérieur et au centre de la gouttière (2) à former, en ce qu'on découpe une ouverture (7) dans la partie de chute centrale (6) de l'ébauche (1) pendant l'opération de formage de la gouttière (2), et en ce que les demi-coudes sont coupés de la bande de chute extérieure (5) et de la partie de chute centrale (6) de l'ébauche.
  2. Procédé suivant la revendication 1, caractérisé en ce qu'on découpe l'ouverture (7) vers la fin de l'opération de formage de la gouttière (2).
  3. Procédé suivant la revendication 2, caractérisé en ce qu'on découpe l'ouverture (7) lorsqu'il reste environ 40% de la course de travail pour le formage de la gouttière (2).
  4. Procédé suivant une quelconque des revendications 1 à 3, caractérisé en ce que l'ébauche (1) est de forme sensiblement carrée ou rectangulaire.
  5. Procédé suivant une quelconque des revendications 1 à 4, caractérisé en ce qu'on laisse des ponts dirigés sensiblement radialement, lors de la division de la gouttière (2), lesdits ponts interconnectant les parties (5) de l'ébauche (1) situées du côté extérieur de la gouttière (2) et les parties (6) situées du côté intérieur de la gouttière.
EP19920201075 1991-04-26 1992-04-15 Procédé de fabrication de coudes de tuyaux à parois minces Expired - Lifetime EP0510759B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9101275A SE9101275D0 (sv) 1991-04-26 1991-04-26 Saett att framstaella en tunnvaeggig roerkroek
SE9101275 1991-04-26

Publications (2)

Publication Number Publication Date
EP0510759A1 EP0510759A1 (fr) 1992-10-28
EP0510759B1 true EP0510759B1 (fr) 1995-06-21

Family

ID=20382581

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920201075 Expired - Lifetime EP0510759B1 (fr) 1991-04-26 1992-04-15 Procédé de fabrication de coudes de tuyaux à parois minces

Country Status (5)

Country Link
EP (1) EP0510759B1 (fr)
DE (1) DE69203030T2 (fr)
DK (1) DK0510759T3 (fr)
ES (1) ES2073856T3 (fr)
SE (1) SE9101275D0 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE355286C (de) * 1922-06-24 Rheinische Schweisswerke Siegl Verfahren zur Herstellung von Rohrkruemmern
US2192471A (en) * 1937-06-17 1940-03-05 Earl J Harbison Method of making pipe fittings
CH470622A (de) * 1967-01-23 1969-03-31 Sulzer Ag Verfahren zum Herstellen von Rohrkrümmern aus gegossenem metallischem Werkstoff
FR2586597B1 (fr) * 1985-08-30 1990-02-02 Wanner Isofi Isolation Procede de fabrication par emboutissage de pieces metalliques rigides destinees a constituer des revetements de calorifuge de tuyauteries, des gaines et d'autres organes similaires

Also Published As

Publication number Publication date
EP0510759A1 (fr) 1992-10-28
ES2073856T3 (es) 1995-08-16
SE9101275D0 (sv) 1991-04-26
DE69203030T2 (de) 1995-11-02
DE69203030D1 (de) 1995-07-27
DK0510759T3 (da) 1995-11-13

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