EP1997569B1 - Procédé de traitement des extrémités de tuyaux - Google Patents

Procédé de traitement des extrémités de tuyaux Download PDF

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Publication number
EP1997569B1
EP1997569B1 EP20080008346 EP08008346A EP1997569B1 EP 1997569 B1 EP1997569 B1 EP 1997569B1 EP 20080008346 EP20080008346 EP 20080008346 EP 08008346 A EP08008346 A EP 08008346A EP 1997569 B1 EP1997569 B1 EP 1997569B1
Authority
EP
European Patent Office
Prior art keywords
pipe
forming
profile
contour
tube
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 - Fee Related
Application number
EP20080008346
Other languages
German (de)
English (en)
Other versions
EP1997569A1 (fr
Inventor
Waleri Keil
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.)
Benteler Automobiltechnik GmbH
Original Assignee
Benteler Automobiltechnik GmbH
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 Benteler Automobiltechnik GmbH filed Critical Benteler Automobiltechnik GmbH
Publication of EP1997569A1 publication Critical patent/EP1997569A1/fr
Application granted granted Critical
Publication of EP1997569B1 publication Critical patent/EP1997569B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/12—Shaping end portions of hollow articles
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/063—Making machine elements axles or shafts hollow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/12—Making machine elements axles or shafts of specially-shaped cross-section

Definitions

  • the invention relates to a method for machining the ends of a longitudinally welded tube made of steel with a three-dimensional contour of the ends in several cutting planes with the steps cutting board, forming tube profile, longitudinal seam welding or continuous tube from a strip, longitudinal seam welding and cutting to length
  • the production of longitudinally welded pipes belongs to the state of the art. So will in the DD 276 043 A1 shown how thin-walled tubes are made of flat sheet metal blanks with the least possible deviation of the cross section of the circular shape. It also belongs to the general state of the art to produce longitudinally welded tubes in a continuous process and then cut fixed lengths of the endless tube.
  • the DE 9116427 U1 a welded hollow profile of a single roll-formed metal strip, wherein the hollow body is closed by high frequency welding facing each other connecting edges.
  • the cross member of a torsion beam axle the so-called torsion often consists of a deformed tube, which must be connected at the pipe ends, each with a trailing arm.
  • a torsion beam axle comprising two composed of a respective lower shell and an upper shell trailing arm and connected to the trailing arms cross member.
  • An essential feature of this torsion beam axle is the design of the transition areas from the cross member to the trailing arm.
  • the End faces of the hollow stub can be trimmed in a simple straight sawing operation.
  • the oval tube end of the cross member is within only one cutting plane. Otherwise it reveals the DE 297 20 207 U1 .
  • the ends of the torsion profile have a configuration adapted to the contour of the tubular trailing arm and extend with their end-side apex areas located here on the upper side of the trailing arm. Consequently, the three-dimensional contour of the ends of the torsion profile is in several cutting planes.
  • Hardened high strength steels are often cut by laser or plasma cutting because of their strength values.
  • plasma cutting the fluctuates Quality of the cut and is overall rather poor, the cutting process therefore requires complex quality controls and produces relatively much rejects.
  • Laser cutting causes even higher maintenance and operating costs than plasma cutting. Both methods of separation have in common that they can lead to splashing and sticking burn on the pipe profile.
  • the DE 196 04 368 C2 shows a method of making a pipe having a diameter larger than a mean pipe diameter at the pipe end.
  • a circuit board is initially provided, which has a rectangular base area, to which at least one contrasting configuration section is connected in one piece.
  • the board is the lengthwise development of the outer peripheral surface of the tube to be produced including any over the circumference of the tube as tabs or the like protruding surfaces.
  • the board is formed into a hollow cylindrical body.
  • a tubular deformation of the base region and the design section takes place in a die in several sub-steps.
  • the longitudinal edges of the base area are then exactly to each other, while the board is wound in the forming section with partially overlapping areas.
  • This is followed by the final shaping of the design section, for example an expansion over an internally acting mandrel. If a tab projecting from the circumference of the tube is to be formed, the design section need only be directed into the corresponding position.
  • the present invention seeks to provide a method for finishing a longitudinally welded pipe with a three-dimensional contour of the ends, which is dimensionally accurate and easier compared to the known manufacturing process.
  • either the three-dimensional contour of the ends with allowance is already introduced into the developed board cut or the three-dimensional contour of the ends is introduced with measure via a mechanical trimming tool in the longitudinally welded pipe.
  • the ends of the tube are heated and by means of a forming mandrel true to length and Contoured compressed.
  • Advantage of this method is the faithful reproducibility of the pipe ends.
  • the trimming of the ends in the board with allowance or the trim on the longitudinally welded pipe with allowance can first be done with a certain tolerance, because the end of the pipe is true to size by the upsetting. Therefore, also lower quality trimming can be used.
  • the cutting times are before a possible hardening process, so that can be dispensed with a laser or plasma cutting of hardened steel.
  • a laser or plasma cutting of hardened steel By eliminating plasma and laser cutting, splashes on the tube profile and burnup are avoided.
  • the heating of the pipe ends is necessary so that the forming forces during upsetting are lower and the material flows better.
  • an inductive heating offers itself for the end heating.
  • the pipe end By means of an inductor, the pipe end can be specifically heated without introducing unnecessary energy into other areas of the pipe.
  • a preferred variant opens up when the tube consists of a hardenable steel grade and is to be hardened anyway.
  • the entire tube must be heated to a temperature above the AC 3 - point of the alloy, is possibly additionally reformed in the warm state and placed in a forming and / or hardening tool.
  • a uniform heating of the tube takes place in a continuous furnace.
  • any other desired heating method such as inductive or conductive heating can also be used.
  • the pipe ends are also heated, it makes sense to make the upsetting of the pipe ends in the forming and / or hardening tool.
  • the advantage is that the heating to a temperature above the AC 3 point of the alloy can be used at the same time for upsetting the pipe ends. An additional post-heating of the pipe ends is unnecessary.
  • the tube is uniformly hardened in the hardening tool including the faithful ends.
  • the pipe ends are partially reheated after the forming and / or hardening process. Due to the considerable heat input, which is necessary to keep the forming forces low, the set by the hardening strength values are lifted at the pipe end. Especially in the case of a torsion beam axle in which the torsion profile located between the trailing arms has been hardened, a reduction in strength is known Pipe ends, however harmless. On the one hand, the increased strength values are needed more in the middle of the torsion profile than at the ends. On the other hand, the material is thickened by the compression process at the ends and thereby increased in wall thickness. This at least partially compensates for the loss of strength.
  • the torsion profile is usually connected by welding technology with the trailing arms, so that anyway takes place an increased heat input at the pipe ends. Therefore, the material thickening by upsetting is advantageous in any case.
  • the more or less strongly deformed ends of the torsion profile are set on the front side on the outer circumference of the trailing arm. Since the trailing arms also consist of tubes or of three-dimensionally shaped pressing shells, the front sides of the torsion profile must map this three-dimensional geometry.
  • the front sides of the Torsionsprofils are therefore correspondingly with allowance in the board or especially when the starting material was a tube cut to length of an endless tube, cut after longitudinal seam welding, but before a hardening process and either in conjunction with a curing process or after a partial heating the front sides over a forming mandrel faithfully compressed to length and contour.
  • the method according to the invention leads to lower investment costs than the mechanical trimming method or a plasma or laser cutting on the hardened tube.
  • the running costs are also lower, because the time-consuming and cost-intensive quality controls and the rejects are reduced after the previous end trimming.
  • Probably the most rewarding variant is in the short tube production, ie in the production of a laser welded tube from a board, which already at the blank cut the end contour with a few mm allowance, for example 1 to 2 mm, each end face punched because the short tube production closest to the final contour is and eliminates additional trimming the already longitudinally welded pipe.
  • a true-to-scale end geometry of the tube can be ensured over the upsetting process in the heated state, which guarantees a trouble-free connection with a connection component.
  • FIG. 1 shows by way of example and schematically a process known from the prior art for producing a longitudinally welded pipe from a circuit board.
  • a tube (2) is formed and closed by a weld (3) along the abutting edge (3) to a tube profile (2).
  • the tube (2) then has a cylindrical shape.
  • the ends (4) are straight cut and each lie within only one cutting plane.
  • FIG. 2 shows by way of example and schematically sub-steps of the method according to the invention. Accordingly, already in the board (10) at the end faces (5) a trim (6) is introduced. This results after rolling a pipe profile (20) with correspondingly shaped three-dimensional contours (7) in several cutting planes in the region of the pipe ends (7).
  • the pipe ends (7) are pre-cut after the longitudinal seam welding of the abutting edge (3) with an oversize final contour.
  • the tube ends (7) are later heated only in a further sub-step, not shown, and compressed by means of a forming mandrel faithfully to length and contour.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laser Beam Processing (AREA)

Claims (4)

  1. Procédé d'usinage des extrémités (7) d'un tube (20) en acier soudé en long avec un contour tridimensionnel (7) des extrémités (7) dans plusieurs plans de coupe, comprenant les étapes
    - découpage de la tôle (10), façonnage du profil de tube (20), soudure longitudinale ou
    - façonnage d'un tube sans fin à partir d'une bande, soudure longitudinale, coupure à la longueur souhaitée,
    caractérise par
    les étapes suivantes du procédé :
    - réalisation du contour tridimensionnel (7) des extrémités (7) avec surépaisseur dans le développement de la découpe de tôle (6) ou
    - réalisation du contour tridimensionnel (7) des extrémités (7) avec surépaisseur sur le tube soudé en longueur (2) au moyen d'une cisaille,
    - chauffage des extrémités (7) du tube (20) et
    - refoulage des extrémités (7) à la longueur et au contour définis au moyen d'un mandrin de façonnage.
  2. Procédé selon la revendication 1,
    caractérise par
    - le chauffage inductif des extrémités (7) du tube (20).
  3. Procédé selon l'une des revendications précédentes,
    caractérise par
    - le chauffage du tube (20) entier en alliage d'acier trempant à une température supérieure au point AC3 de l'alliage et
    - le refoulage des extrémités (7) du tube (20) à la longueur et au contour définis au moyen d'un mandrin de façonnage, dans un outil à déformer et/ou un outil à tremper, et
    - le durcissement du profil de tube (20) dans l'outil.
  4. Procédé selon l'une des revendications précédentes,
    caractérisé en ce que
    le profil (20) est un profil de torsion destiné à un essieu multibras d'un véhicule à moteur, avec l'étape supplémentaire suivante :
    - transformation du tube en profil de torsion avant ou pendant le refoulage des extrémités chauffées du tube à la longueur et au contour définis.
EP20080008346 2007-05-22 2008-05-02 Procédé de traitement des extrémités de tuyaux Expired - Fee Related EP1997569B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007023173A DE102007023173A1 (de) 2007-05-22 2007-05-22 Verfahren zur Bearbeitung der Enden von Rohren

Publications (2)

Publication Number Publication Date
EP1997569A1 EP1997569A1 (fr) 2008-12-03
EP1997569B1 true EP1997569B1 (fr) 2009-11-25

Family

ID=39639481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080008346 Expired - Fee Related EP1997569B1 (fr) 2007-05-22 2008-05-02 Procédé de traitement des extrémités de tuyaux

Country Status (2)

Country Link
EP (1) EP1997569B1 (fr)
DE (2) DE102007023173A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009050058C5 (de) 2009-10-21 2019-02-28 Volkswagen Ag Verbundlenkerachse und Verfahren zur Herstellung von Verbundlenkerachsen für Kraftfahrzeuge
DE102012112133A1 (de) 2012-12-12 2014-06-12 Sergei Nicolaewich Belov Verfahren und Vorrichtung zur warmen Umformung von Rohrenden
CN105834346B (zh) * 2015-01-13 2017-11-03 中国科学院金属研究所 一种使用小压力高效愈合钢锭内部孔洞型缺陷的锻造方法

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE439258C (de) * 1924-03-27 1927-01-07 Valentin Retterath Verfahren zum Verdicken der Enden duennwandiger Rohre
DE521450C (de) * 1928-03-22 1931-03-25 Mannesmann Ag Verfahren zum Anstauchen von Rohrenden
US3453720A (en) * 1966-05-05 1969-07-08 Fruehauf Corp Method of making axles
DE1982563U (de) * 1967-02-09 1968-04-04 Richard Antretter Mit dosiereinrichtung versehenes streugeraet fuer schuettbare massen.
FR2579490B1 (fr) * 1985-03-26 1988-12-09 Fruehauf France Procede de fabrication d'essieux monoblocs de vehicules routiers
DD276043A1 (de) 1988-10-05 1990-02-14 Waermegeraete U Armaturen Werk Verfahren und vorrichtung zur herstellung duennwandiger rohre
DE9116427U1 (de) 1991-12-18 1992-11-26 Welser Profile Ag, Ybbsitz Hohlprofil
DE19604368C2 (de) 1996-02-07 1999-12-30 Benteler Werke Ag Verfahren zur Herstellung eines Rohrs mit Abschnitten unterschiedlicher Querschnittskonfiguration
DE29720207U1 (de) 1997-11-14 1998-01-02 Benteler Ag, 33104 Paderborn Verbundlenkerachse für Kraftfahrzeuge
DE19941993C1 (de) 1999-09-02 2000-12-14 Benteler Werke Ag Verfahren zur Herstellung eines biegesteifen torsionsweichen Rohrprofils als Querträger für eine Verbundlenkerhinterachse eines Personenkraftwagens
DE10120392B4 (de) * 2001-04-25 2004-09-23 Muhr Und Bender Kg Verfahren zum Herstellen von rotationssymmetrischen Bauteilen
DE10207151C1 (de) 2002-02-20 2003-02-13 Benteler Automobiltechnik Gmbh Verbundlenkerachse

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Publication number Publication date
EP1997569A1 (fr) 2008-12-03
DE102007023173A1 (de) 2008-11-27
DE502008000213D1 (de) 2010-01-07

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