EP0043335B1 - Dispositif de fabrication à chaud en continu d'éléments métalliques tubulaires courbes - Google Patents

Dispositif de fabrication à chaud en continu d'éléments métalliques tubulaires courbes Download PDF

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Publication number
EP0043335B1
EP0043335B1 EP81420095A EP81420095A EP0043335B1 EP 0043335 B1 EP0043335 B1 EP 0043335B1 EP 81420095 A EP81420095 A EP 81420095A EP 81420095 A EP81420095 A EP 81420095A EP 0043335 B1 EP0043335 B1 EP 0043335B1
Authority
EP
European Patent Office
Prior art keywords
mandrel
blanks
ring
shank
diameter
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
Application number
EP81420095A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0043335A1 (fr
Inventor
Michel Leblanc
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.)
Vallourec SA
Original Assignee
Vallourec 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 Vallourec SA filed Critical Vallourec SA
Priority to AT81420095T priority Critical patent/ATE5952T1/de
Publication of EP0043335A1 publication Critical patent/EP0043335A1/fr
Application granted granted Critical
Publication of EP0043335B1 publication Critical patent/EP0043335B1/fr
Expired legal-status Critical Current

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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
    • B21D9/00—Bending tubes using mandrels or the like
    • B21D9/12—Bending tubes using mandrels or the like by pushing over a curved mandrel; by pushing through a curved die

Definitions

  • the present invention relates to a device for continuously manufacturing hot tubular curves, in particular steel.
  • metal curves are made from blanks or ferrules each consisting of a section of tube, the blanks being threaded in groups and pushed by a pushing means on a mandrel comprising a straight cylindrical rod extended at its end by a curved section.
  • a heating means for example an electric inductor or a gas oven, being arranged substantially in the connection zone of the straight rod of the mandrel with the forming section.
  • the blanks used are made of tubes manufactured in great length, then cut.
  • the object of the invention is precisely to provide a device making it possible to ensure good constant positioning of the blanks.
  • the device according to the invention is characterized in that it comprises, on the straight mandrel rod, upstream of the heating zone, a ring surrounding the mandrel rod and comprising at least one cylindrical seat of the same axis as that of the mandrel rod, the diameter of this bearing surface, greater than the diameter of the mandrel rod, being at least equal to the nominal interior diameter of the tubular blanks threaded and passed.
  • the ring can be made in one piece with the mandrel rod or preferably be made by turning and attached around said rod.
  • the cylindrical bearing surface of the ring is connected to the mandrel rod by frustoconical bearing surfaces.
  • a cold plastic deformation is produced in the blanks pushed on the rod using a pusher means, around the ring which results in giving the blanks a constant internal diameter by compensating initial dimensional irregularities.
  • the blanks which, after passing over the expansion ring, constitute a train of blanks in permanent compression between the forming-expansion zone of the mandrel and the expansion ring of the rod, are thus able to continue their journey towards the heating / forming zone of the mandrel while remaining perfectly aligned and centered on the rod.
  • the diameter of the rod, in this part, between the expansion ring and the mandrel forming zone, can be different from that of the upstream part of the rod, so as to reduce the play to a minimum and constant value.
  • the presence of the ring according to the invention means that the blanks, advancing beyond said ring towards the heating and forming-expansion zone of the mandrel, are constantly kept pressed against each other by means of the sections d end and this, whether one exerts a push or not.
  • This allows, for example, to feed the machine with blanks, by stopping the thrust, without destroying the centering or the alignment of the blanks presented to the heating.
  • This maintenance in a centered position of the blanks, in the absence of thrust, is due to the frictional forces on the ring and to the geometrical constriction of the rod during the release of pusee, the whole allowing a sufficient tightening of the blanks between them to maintain them in position.
  • the length of the rod extending between the ring and the heating zone of the blanks is preferably long enough to avoid any noticeable thermal effect on the ring. This length therefore depends on the heating means used. Furthermore, the ring is arranged downstream of the pushing means as close as possible to the end of this means in its most advanced position.
  • the length of the cylindrical bearing surface of the ring is advantageously between approximately 0.5 and approximately 1.5 times the nominal diameter of the blanks used.
  • the slope of the frustoconical bearing upstream is advantageously between approximately 7.5% and approximately 15% so as to facilitate the expansion of the metal in diameter and the slope of the frustoconical bearing downstream of the ring, that is to say -to say, towards the heating device fage is advantageously between about 5% and about 7%.
  • the mandrel comprises a straight cylindrical rod (1) of considerable length extended by a curved end portion of expansion and forming (2).
  • a means for heating the blanks shown diagrammatically in the form of an inductor (3).
  • the tubular blanks are threaded at the left end in FIG. 1 of the rod (1) and pushed using a conventional pusher means, not shown.
  • an expansion ring for the blanks (4) being able to be produced integrally with the rod (1) or attached to it and comprising a cylindrical bearing surface (5) connecting to the rod (1) by frustoconical bearing surfaces (6) upstream and respectively (7) downstream.
  • FIG. 2 Illustrated in Figure 2 a blank T threaded around the rod (1) and moved using a pushing means in the direction of the arrow (A), towards the heating device (3) and the forming area (2).
  • the external diameter of the cylindrical section (5) being greater than the nominal internal diameter of the blanks (T) introduced, these being pushed are deformed cold on the ring (4) and continue their movement on the rod (1) having received an internal diameter as constant as possible, so that it can be precisely aligned and centered on the downstream part of the mandrel rod (1) avoiding any risk of jamming, bending, tearing, entanglement and / or overlapping.
  • the diameter of the mandrel rod (1) upstream and downstream of (4) is adjusted to the actual tolerances of the inside diameter of the blanks; thus, the diameter of the downstream part of the rod (1) will be greater than that of the upstream part of the rod (1) and the diameter of the downstream part will be calculated to have a minimum and regular clearance of the order of 5 to 10/1 oeme of mm on diameter, for example.
  • the ring (4) is designed so as to allow the lubricant, which is inside the blanks (T) upstream of said ring, to pass downstream of (4) so that the blanks continue to be lubricated after passing over the ring.
  • a preferred solution consists in cutting on the cylindrical part of (4) grooves (8), not parallel to the axis of the rod, but helical, for example, three or four in number.
  • Such grooves (8) ensure the continuity of the internal lubrication of the blanks, while avoiding any marking and / or deformation located on the inside of the blanks.
  • an expansion ring is used, the cylindrical bearing of which has a diameter of 60 mm.
  • the blanks have a length of 270 mm, the cylindrical bearing surface of the ring has a length of 55 mm, the frustoconical bearing upstream a length of 15 mm and a slope of 12.6% and the frustoconical bearing downstream a length of 15 mm and a slope of 6.6%.
  • the diameter of the rod (1) upstream of the ring is 58.1 mm and downstream of the ring is 59 mm.
  • the length of the rod between the ring (4) and the inductor (3) is of the order of 1.5 m. As explained, any floating of the blanks in this area is avoided, even in the absence of thrust.
  • a very high strength steel is used for the production of the expansion ring which is treated for example so as to reach a breaking load of the order of 2200 MPa.
  • An advantageous embodiment consists in using an expansion ring which is threaded on its internal diameter.
  • the mandrel then comprises a rod produced in two parts which are assembled end to end by screwing inside the expansion ring, which therefore plays the role of junction piece at the same time. It is thus easy to change the ring when it is worn.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP81420095A 1980-06-27 1981-06-26 Dispositif de fabrication à chaud en continu d'éléments métalliques tubulaires courbes Expired EP0043335B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81420095T ATE5952T1 (de) 1980-06-27 1981-06-26 Vorrichtung zum fortlaufenden warmherstellen metallischer rohrbogen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8014362 1980-06-27
FR8014362A FR2485409A1 (fr) 1980-06-27 1980-06-27 Dispositif de fabrication a chaud en continu de courbes metalliques tubulaires

Publications (2)

Publication Number Publication Date
EP0043335A1 EP0043335A1 (fr) 1982-01-06
EP0043335B1 true EP0043335B1 (fr) 1984-01-25

Family

ID=9243604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81420095A Expired EP0043335B1 (fr) 1980-06-27 1981-06-26 Dispositif de fabrication à chaud en continu d'éléments métalliques tubulaires courbes

Country Status (4)

Country Link
EP (1) EP0043335B1 (https=)
AT (1) ATE5952T1 (https=)
DE (1) DE3162026D1 (https=)
FR (1) FR2485409A1 (https=)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116586527B (zh) * 2023-07-18 2023-09-05 盐山亚汇管业有限公司 一种便于上料的弯头推制装置及工艺

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE583550C (de) * 1931-03-28 1933-09-05 Rohrbogenwerk G M B H Verfahren zur Herstellung von Rohrbogen
DE573890C (de) * 1931-04-25 1933-10-10 Rohrbogenwerk G M B H Verfahren zur Herstellung von Rohrbogen o. dgl.
DE658010C (de) * 1935-01-29 1938-03-19 Mannesmann Ag Verfahren zum Biegen von Rohrbogen o. dgl. mit geraden Schenkeln
US2105075A (en) * 1935-10-08 1938-01-11 Tube Turns Inc Method and apparatus for making pipe bends
DE1056905B (de) * 1957-10-23 1959-05-06 Kocks Gmbh Friedrich Verfahren zum Biegen von Rohren

Also Published As

Publication number Publication date
FR2485409A1 (fr) 1981-12-31
ATE5952T1 (de) 1984-02-15
DE3162026D1 (en) 1984-03-01
FR2485409B1 (https=) 1982-08-20
EP0043335A1 (fr) 1982-01-06

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