EP0323456B1 - Verfahren und vorrichtung zum kaltformen von rohren oder anschlussstücken und damit hergestellte gegenstände - Google Patents

Verfahren und vorrichtung zum kaltformen von rohren oder anschlussstücken und damit hergestellte gegenstände 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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English (en)
French (fr)
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EP0323456A1 (de
Inventor
Augusto Archi
Enrico Sebastiani
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0323456A1 publication Critical patent/EP0323456A1/de
Application granted granted Critical
Publication of EP0323456B1 publication Critical patent/EP0323456B1/de
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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)
  • Moulding By Coating Moulds (AREA)

Claims (3)

  1. Verfahren zum Kaltformen von Rohren oder Rohr-Anschlußstücken, dem gemäß ein Rohr oder ein Rohr-Anschlußstück in ein Gesenk eingesetzt und zwei sich radial erstreckende, untereinander verbundene Wände (22, 22a) - nämlich senkrecht zu der Achse (X-X) des Rohres oder des Rohr-Anschlußstücks - geformt werden, dann im wesentlichen radial einwärts wirkende Kräfte auf Zonen (10) aufgebracht werden, die den radialen Wänden (22, 22a) benachbart sind, wobei die Zonen benachbart zu den radial äußersten Enden der radialen Wände sind, die von innen unterstützt werden, dadurch gekennzeichnet, daß die radialen Wände (22, 22a) mindestens eine Seite nicht unterstützt haben und daß die Reaktionskräfte zu den aufgebrachten radialen Kräften mit Hilfe der radialen Wände (22, 22a) geliefert werden, wobei die Basis einer jeden radialen Wand durch eine innere Abstützung (30) unterstützt ist, die radialen Wände als einzige Mittel im Gegensatz zu diesen Kräften wirken und das Verhältnis Höhe/Dicke der radialen Wände so ist, daß die Ausknickgrenzbelastung niedriger ist als die kombinierte Biege- und Kompressionsspannung.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß während der Anwendung der radialen Kräfte das Gesenk (20, 20a) frei ist, sich axial zu bewegen.
  3. Vorrichtung zum Kaltformen eines Rohres oder eines Rohr-Anschlußstücks, die ein Gesenk (20, 20a), das in der Lage ist, zwei radiale Wände (22, 22a) auf dem Rohr oder dem Rohr-Anschlußstück zu bilden; ein Formungsteil (40), das vorgesehen ist, um nachfolgend in einer im wesentlichen radialen Richtung auf eine Zone (10) benachbart zu den radialen Wänden (22, 22a) zu wirken, eine innere Abstützung (30), die in das zu formende Rohr oder das Rohr-Anschlußstück eingeführt werden kann und das von innen die Basis der radialen Wände (22, 22a) unterstützt, aufweist, dadurch gekennzeichnet, daß das Gesenk zwei gegenüberliegende Teile (20, 20a) aufweist, die lediglich axial beweglich sind und frei sind, sich zu bewegen, wenn der Formungsteil (40) in Kontakt mit der Zone (10) kommt, wobei das Formungsteil in der Lage ist, radial einwärts zu wirken, um die Formungstätigkeit durchzuführen.
EP87904388A 1986-06-30 1987-06-29 Verfahren und vorrichtung zum kaltformen von rohren oder anschlussstücken und damit hergestellte gegenstände Expired - Lifetime EP0323456B1 (de)

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 (de) 1989-07-12
EP0323456B1 true EP0323456B1 (de) 1993-02-03

Family

ID=11175029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87904388A Expired - Lifetime EP0323456B1 (de) 1986-06-30 1987-06-29 Verfahren und vorrichtung zum kaltformen von rohren oder anschlussstücken und damit hergestellte gegenstände

Country Status (5)

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

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
SI1700354T1 (sl) * 2004-01-02 2012-02-29 Water Gremlin Co Baterijski del
MX2021006454A (es) 2018-12-07 2021-07-02 Water Gremlin Co Partes de bateria que tienen barreras contra acidos sin solventes y sistemas y metodos asociados.

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

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