EP0323456B1 - Procede et appareil pour le formage a froid de tubes ou raccords, et produits ainsi obtenus - Google Patents

Procede et appareil pour le formage a froid de tubes ou raccords, et produits ainsi obtenus Download PDF

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Publication number
EP0323456B1
EP0323456B1 EP87904388A EP87904388A EP0323456B1 EP 0323456 B1 EP0323456 B1 EP 0323456B1 EP 87904388 A EP87904388 A EP 87904388A EP 87904388 A EP87904388 A EP 87904388A EP 0323456 B1 EP0323456 B1 EP 0323456B1
Authority
EP
European Patent Office
Prior art keywords
pipe
radial
radial walls
walls
fitting
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
EP87904388A
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German (de)
English (en)
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EP0323456A1 (fr
Inventor
Augusto Archi
Enrico Sebastiani
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Individual
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Individual
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Publication date
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Publication of EP0323456A1 publication Critical patent/EP0323456A1/fr
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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
    • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
    • B21D17/02—Forming single grooves in sheet metal or tubular or hollow articles by pressing
    • 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
    • B21D53/24—Making other particular articles nuts or like thread-engaging members

Definitions

  • the present invention refers to a process and apparatus for the cold shaping or cold forming of pipes or metallic pipe fittings.
  • Shaped pipes or pipe fittings are normally obtained by casting or through a mechanical process, therefore they are expensive.
  • the attempt to produce these articles made of plastics has resulted in pieces having a mechanical resistance definitely unsuitable for the most common uses.
  • FR-A-1 393 986 provides for a process, as defined in the pre-characterizing part of the claim 1, consisting of applying a longitudinal pressure on the cylindrical walls of a piece of pipe to obtain a collar with a thickness double compared to the one of the cylindrical walls.
  • the collar in a second step is radially compressed from the outside on six sides, since the surfaces are simultaneously closed both internally and externally, to form a massive hexagon.
  • FR-A-1 393 986 also discloses an apparatus, as defined in the pre-characterizing part of claim 3, for carrying out the above process.
  • the aim of the present invention is to produce pipes or metallic pipe-fittings of various shapes which are much more economical than the prior art ones, while still maintaining their sturdiness unaltered.
  • the radially extending walls can be formed by shaped radial die slides or inserts acting on the pipe or pipe-fitting wall.
  • the obtained articles are preferably, but not limitedly: pipes or pipe-fittings having a same diameter at both ends or different diameters and with a polygonal or circular collar; pipes or pipe-fittings with ring at their ends.
  • These hose fittings can have circular collars capable of being sealed with conical or flat coupling surfaces.
  • Figure 1 and 2 show the working phases on a pipe section 17.
  • This pipe section is inserted in the dies 20 and 20a provided with abutments 13 and is compressed axially, thus obtaining first, in a known way, through cone 29, the enlargement of one of its portions, then the forming of radial walls 22 and 22a. These latter are them shaped by inserts 40 acting radially to the pipe section 17.
  • the pipe and particularly the internal base of each radial wall 22 and 22a is supported by a support 30 inside the pipe, preferably a plug.
  • This internal support 30 is provided with at least a cone 29 which carries out the shaping of the pipe and supports the internal base of the radial walls 22 and 22a.
  • FIGs 3, 4 and 5 show more in detail the above mentioned working phases; as shown in Fig. 3 a portion of pipe 17 is first enlarged, then, continuing the compression by moving the dies 20 and 20a, the radial walls 22 and 22a are formed (Fig. 4). During this phase the approach of the two dies 20 and 20a is carried out until the distance between the extreme ends 21 of the dies is equal to twice the thickness of the pipe to be shaped.
  • Fig. 5 shows the shaping of zone 10 connecting the radial walls 22 and 22a.
  • the two dies 20 and 20a are left free to move away until the distance between the extreme sides 21 is equal to the thickness required for the collar 11.
  • the inserts 40 have front sides 40a having a width equal to the collar thickness.
  • Fig. 6 shows a pipe-fitting 18 having a polygonal collar 11 and two portions having different diameter
  • Fig. 7 shows a pipe-fitting 19 similar to the one in Fig. 6, but having equal diameter at both ends.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Forging (AREA)

Abstract

Une longueur tubulaire (17) d'un tube ou d'un raccord est d'abord soumise à des déformations de manière à obtenir au moins une paroi radiale, essentiellement perpendiculaire à l'axe du tube, et ayant par rapport à l'épaisseur une hauteur telle que sa charge limite d'écrasement est inférieure à sa charge limite de flexion et de compression; ensuite ledit tube est déformé par des forces essentiellement radiales qui agissent sur une zone adjacente à ladite paroi radiale qui sert de support. La paroi radiale peut être supportée à sa base interne. La paroi radiale (22, 22a) peut être formée en faisant agir des éléments radiaux formés (40) sur la paroi du tuyau ou en faisant agir mutuellement deux matrices qui dégagent le tube au point voulu, réalisant ainsi un collier. Un travail ultérieur à froid peut s'effectuer au moyen des éléments radiaux, et mettre en contact une partie du tube adjacente à ladite paroi radiale avec une surface fixe qui forme ladite partie. Un format axial de la paroi radiale peut être réalisé au moyen de matrices dont l'action se fait dans un sens axial.

Claims (3)

  1. Procédé pour le formage à froid de tuyaux ou de raccords de tuyau selon lequel un tuyau ou un raccord de tuyau est introduit dans une matrice, et selon lequel sont formées deux cloisons reliées qui s'étendent radialement (22, 22a) - c'est-à-dire perpendiculairement à l'axe (X-X) du tuyau ou du raccord de tuyau - ensuite des forces importantes sont appliquées agissant radialement vers l'intérieur sur des zones (10) attenantes auxdites cloisons radiales (22, 22a), lesdites zones étant attenantes aux extrémités les plus radialement extérieures desdites cloisons radiales qui sont supportées intérieurement, caractérisé en ce que lesdites cloisons radiales (22, 22a) ont au moins un côté non supporté et en ce que les forces de réaction auxdites forces radiales appliquées sont fournies au moyen desdites cloisons radiales (22, 22a), la base de chaque cloison radiale étant supportée par un support intérieur (30), lesdites cloisons radiales agissant comme seul moyen pour contrer ces forces, le rapport de la hauteur à l'épaisseur desdites cloisons radiales étant tel que leur charge limite de flambage soit inférieure à la combinaison de la contrainte de flexion et de la contrainte de compression.
  2. Procédé selon la revendication 1, caractérisé en ce que pendant l'application desdites forces radiales, la matrice (20, 20a) est libre de se déplacer axialement.
  3. Appareil pour le formage à froid d'un tuyau ou d'un raccord de tuyau comprenant une matrice (20, 20a) capable de former deux cloisons radiales (22, 22a) sur le tuyau ou sur le raccord de tuyau ; un élément de mise en forme (40) prévu pour agir successivement, suivant une direction sensiblement radiale, sur une zone (10) attenante aux cloisons radiales (22, 22a) ; un support interne (30), qui peut être introduit dans le tuyau ou dans le raccord de tuyau à former, et qui supporte intérieurement la base des cloisons radiales (22, 22a), caractérisé en ce que la matrice comprend deux parties opposées (20, 20a) qui sont mobiles seulement axialement et sont libres de se déplacer lorsque l'élément de mise en forme (40) vient en contact avec ladite zone (10), l'élément de mise en forme étant capable d'agir radialement vers l'intérieur pour exécuter l'opération de formage.
EP87904388A 1986-06-30 1987-06-29 Procede et appareil pour le formage a froid de tubes ou raccords, et produits ainsi obtenus Expired - Lifetime EP0323456B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT20988/86A IT1191835B (it) 1986-06-30 1986-06-30 Procedimento e relativa apparecchiatura per produrre a freddo sagomatura di vario tipo su tubi o raccordi e prodotti cosi' ottenuti
IT2098886 1986-06-30

Publications (2)

Publication Number Publication Date
EP0323456A1 EP0323456A1 (fr) 1989-07-12
EP0323456B1 true EP0323456B1 (fr) 1993-02-03

Family

ID=11175029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87904388A Expired - Lifetime EP0323456B1 (fr) 1986-06-30 1987-06-29 Procede et appareil pour le formage a froid de tubes ou raccords, et produits ainsi obtenus

Country Status (5)

Country Link
EP (1) EP0323456B1 (fr)
AU (1) AU7644487A (fr)
DE (1) DE3784070T2 (fr)
IT (1) IT1191835B (fr)
WO (1) WO1988000099A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10031989B4 (de) 2000-06-30 2007-08-16 Witzig & Frank Gmbh Verfahren und Vorrichtung zur Herstellung von Pressfittings aus Stahl, insbesondere Edelstahl
BRPI0417087B1 (pt) * 2004-01-02 2018-06-19 Water Gremlin Company Terminal de bateria fundido sob pressão, métodos de fabricar uma parte de bateria e um terminal de bateria e de fundir sob pressão um terminal de bateria, e, parte de bateria de chumbo ou liga de chumbo
BR112020021221A2 (pt) 2018-12-07 2021-07-27 Water Gremlin Company peça de bateria, método para fabricar uma peça de bateria, e, sistema para fabricar peça de bateria

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR402947A (fr) * 1908-09-12 1909-10-20 Eriel D'usines A Gaz Douille de raccord et son procédé de fabrication
FR446337A (fr) * 1911-09-07 1912-12-02 Victor Hawkins Pankhurst Chemise ondulée pour moteurs à combustion interne
US1854000A (en) * 1929-07-13 1932-04-12 Fulford Mfg Co Method and apparatus for making contact pins
GB515745A (en) * 1938-06-07 1939-12-13 Ernest Haslam Improvements in or relating to tools used in flanging tubes
FR1393986A (fr) * 1963-03-04 1965-04-02 Nautchno I I Pi Avtomobilnovo Procédé de fabrication de pièces creuses à plusieurs facettes
US3866457A (en) * 1973-08-24 1975-02-18 Caterpillar Tractor Co Method and apparatus for tube forming
JPS5659555A (en) * 1979-10-18 1981-05-23 Komatsu Ltd Production of joint
DE3409549A1 (de) * 1984-03-15 1985-09-26 Gesenkschmiede Schneider Gmbh, 7080 Aalen Verfahren zur herstellung von flanschen oder bunden an hohlteilen

Also Published As

Publication number Publication date
AU7644487A (en) 1988-01-29
WO1988000099A1 (fr) 1988-01-14
IT8620988A0 (it) 1986-06-30
IT8620988A1 (it) 1987-12-30
DE3784070T2 (de) 1993-07-01
IT1191835B (it) 1988-03-23
DE3784070D1 (de) 1993-03-18
EP0323456A1 (fr) 1989-07-12

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