EP2205370B1 - Procede et dispositif de fabrication d'un corps creux et corps creux - Google Patents

Procede et dispositif de fabrication d'un corps creux et corps creux Download PDF

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Publication number
EP2205370B1
EP2205370B1 EP08838645A EP08838645A EP2205370B1 EP 2205370 B1 EP2205370 B1 EP 2205370B1 EP 08838645 A EP08838645 A EP 08838645A EP 08838645 A EP08838645 A EP 08838645A EP 2205370 B1 EP2205370 B1 EP 2205370B1
Authority
EP
European Patent Office
Prior art keywords
hollow body
die
cross
produced
sectional area
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.)
Not-in-force
Application number
EP08838645A
Other languages
German (de)
English (en)
Other versions
EP2205370A1 (fr
Inventor
Thomas Flehmig
Jörg GORSCHLÜTER
Oliver Mertens
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Steel Europe AG
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 ThyssenKrupp Steel Europe AG filed Critical ThyssenKrupp Steel Europe AG
Publication of EP2205370A1 publication Critical patent/EP2205370A1/fr
Application granted granted Critical
Publication of EP2205370B1 publication Critical patent/EP2205370B1/fr
Not-in-force 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
    • 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
    • B21C37/16—Making tubes with varying diameter in longitudinal direction
    • B21C37/18—Making tubes with varying diameter in longitudinal direction conical tubes
    • B21C37/185—Making tubes with varying diameter in longitudinal direction conical tubes starting from sheet material
    • 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
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0815—Making tubes with welded or soldered seams without continuous longitudinal movement of the sheet during the bending operation
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/025—Stamping using rigid devices or tools for tubular articles
    • 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
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • the invention relates to a device for carrying out the method.
  • Hollow bodies are frequently required in motor vehicle construction and in pipeline construction, which have large cross-sectional shape changes in the axial direction in only a short axial length, for example from a small cross section to a large cross section.
  • the shape transition between the different cross-sectional shapes having axial sections of these hollow body therefore extends substantially in a radial plane.
  • an exhaust system of a motor vehicle can be considered, which has a correspondingly executed hollow body in the region of the muffler.
  • Other hollow bodies are for example support ends of a frame structure of a motor vehicle or fittings of piping systems. All of these hollow bodies are often produced by a plurality of interconnected, in particular welded, sheets, which have been formed into a corresponding hollow body.
  • the strength of the hollow body thus produced is due to the variety the welds but in need of improvement.
  • welds are susceptible to corrosion and increase the cost of manufacturing.
  • a variety of manufacturing methods are known to produce, for example, from a tubular body corresponding hollow body with strongly deposited shape transition.
  • the pressing of circular blanks or deep-drawn preforms also allows radially extending shape transitions.
  • these shape transitions can usually be made only at the pipe ends and lead to a strong thinning of the sheet thickness. The same applies to the hydroforming, which requires additional high investments in the field of tools.
  • a method according to the preamble of claim 1 is known from JP-A - 2006 00 2898 known.
  • the present invention seeks to provide a method and an apparatus for producing a generic hollow body available, which or which can be operated economically and with which or with which a high strength having hollow body with substantially in one Radial level extending shape transitions and almost constant sheet thickness can be produced.
  • the above-derived object is procedurally achieved by a method having the features of claim 1.
  • the sheet thickness decrease is minimal, since a mold flow of the mold transition or by the compression of the transition region of the preform body, a material flow is generated, which significantly reduces the sheet thickness decrease in highly deformed areas.
  • the thus produced hollow body with a substantially in a radial plane extending shape transition between two axial sections has a very homogeneous sheet thickness.
  • the hollow body can be carried out very economically due to the two-step process, namely the production of the preform and the compression molding of the preform, on the other hand, the resulting hollow body in terms of stability has very good properties.
  • any shape transition is considered, which has a maximum deviation of +/- 20 ° to the perpendicular to the axial direction.
  • the shape transition which essentially runs in a radial plane, takes place between axial sections of the hollow body having different cross-sectional areas, ie axial sections with a small cross-section and / or between different cross-sectional shapes, such as axial and polygonal axial sections of the hollow body.
  • the axial lengths of the axial sections of the hollow body to be produced with different cross-sectional areas may have different lengths, preferably a division of for example, 1/3 to 2/3, wherein 1/3 of the length refers to larger cross-sectional areas.
  • the known methods it has hitherto often only been possible to introduce radially extending shape transitions, for example, into a tubular body in end regions.
  • the preform body is produced from at least one printed circuit board, for example using the rolling-in technique or by U-forming. Both methods, the Einrolltechnik and the UO-forming, have already been tested and allow an economical production of hollow bodies, which can be used as a preform.
  • the formed board is welded together in the edge area.
  • the preform bodies produced by these methods continue to have very good forming properties due to the material-sparing pre-processes.
  • the die upsetting In the second process step, the die upsetting, this also allows large degrees of deformation to be achieved.
  • the length of the transition region of the preform body is selected as a function of the wall thickness of the formed blank, the shape change in the shape transition and depending on the material such that the maximum change in sheet thickness in the axial direction of the hollow body, especially in the area of the shape transition, is ⁇ 15%.
  • the process reliability of the method according to the invention can be further increased and the change in sheet thickness controlled by the method according to the invention.
  • the method according to the invention is particularly advantageous if the preform body has the outer and inner shape of the hollow body to be produced in at least one axial section.
  • the upsetting is particularly simple, since the mandrel can be arranged in a simple manner displaceable in this axial section of the preform body.
  • preform tubular bodies are formed, so that in a simple way fittings or parts of exhaust systems or support ends of a frame structure of a motor vehicle are produced.
  • functional elements or secondary elements are introduced into the hollow body to be produced, so that it can be dispensed with the subsequent introduction of these elements.
  • the introduction of the functional elements and / or secondary molding elements in the die for the production of the preform or in the die for forming the shape transition of the mold transition as well as in the mandrel itself can be integrated.
  • Functional elements or secondary features may be, for example, stampings, holes or tabs in the lateral surface of the hollow body. Other functional elements are also conceivable.
  • blanks of steel, of a steel alloy, in particular of high-strength steels are preferably used for producing the preform body.
  • the method according to the invention allows the use of high-strength steels, since no large degrees of deformation are required for producing the hollow body.
  • the preform body is made of "tailored blanks".
  • "Tailored blanks” are adapted to the particular application, for example, consisting of sheets with different thicknesses and / or material grades blanks.
  • a device in that a first die is provided for producing a preform body from a board using the rolling-in technique or the UO-forming process, wherein the first die is formed such that the preform body has at least one transition region extending in the axial direction of the hollow body to be produced, arranged between the first and the second axial section, and in the transition region the cross-sectional area of the preform body preferably continuously changes from the cross-sectional area of the first axial section to the cross-sectional area of the second axial section, and at least one second Die is provided for receiving the produced preform body with a forming mandrel, wherein the second die has the outer end shape of the hollow body, the forming mandrel, the inner end shape of the hollow to be produced body and the mandrel is axially displaceable relative to the second die.
  • the method according to the invention can be carried out in an economical manner, so that, with regard to the advantages of the device according to the invention, the advantages of the method according to the invention are pointed out becomes.
  • the necessary dies for the production of the preform and for molding of the hollow body in its final form require no high investment and thus contribute to the efficiency of the process.
  • first and / or the second die and / or the forming mandrel has means for introducing functional and / or secondary shaped elements into the hollow body. These do not have to be introduced by additional steps or devices.
  • a further advantageous embodiment of the device according to the invention provides that means for automatically transporting a board into the first die of the device and / or means for inserting the preform body in the second die and / or means for removing the hollow body from the second die are provided.
  • the compositions significantly improve the cycle times for producing the hollow body and, to that extent, lead to a particularly economical method of producing the hollow body.
  • the above object is achieved by a hollow body made of metal, which has at least a first axial section with a first cross-sectional area and a second axial section with a second cross-sectional area and wherein both axial sections of the hollow body over a substantially in a radial plane extending shape transition with each other are connected, thereby achieved that this is produced by the method according to the invention and the maximum change in sheet thickness, in particular in the region of the shape transition +/- 15%.
  • the inventive method allows a particularly gentle production of a hollow body with substantially in a radial plane shape transition between axial sections of different cross-sectional areas and thus allows particularly small changes in sheet thickness of the hollow body.
  • hollow body having radial shape transition can be made available by the hollow body made of steel, a steel alloy and / or high-strength steels.
  • "tailored blanks" can also be used to produce the hollow bodies, so that adaptation of the hollow body to the loads occurring in the application can be achieved with simultaneous weight optimization.
  • the use of high-strength steels results in the thus produced hollow bodies being adapted to high loads.
  • the preform body 1 is shown in a schematic, axial sectional view.
  • the preform body has a first axial section 2 with a first cross-sectional area and a second axial section 3 with a second cross-sectional area.
  • the cross-sectional area of the first axial section 2 is smaller than the cross-sectional area of the second axial section 3.
  • the shape transition in the axially extending transition region 4 is continuous or linear. But there are also other shape transitions conceivable.
  • preform body 1 shown preform body 1, for example, by the application Einrolltechnik or a UO-forming are produced.
  • the preform body, as well as the finished hollow body has a circular cross-section and is therefore particularly simple.
  • the shape transition can also take place between different cross-sectional shapes.
  • Fig. 2 now shows in a schematic, axial sectional view of an embodiment of a die for form upsetting the preform body 1 for carrying out the method according to the invention.
  • the die 5 has a die 6, which corresponds to the outer shape of the hollow body to be produced.
  • the preform body 1 is already inserted and the mandrel 7 is inserted into the preform body 1.
  • the mandrel 7 may additionally comprise, not shown means for introducing functional and / or secondary features in the hollow body. Other means, not shown, for introducing functional elements can also be provided in the die 5, but also in the forming mandrel 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Forging (AREA)

Claims (10)

  1. Procédé pour la fabrication d'un corps creux en métal, lequel présente au moins une première partie axiale (2) avec une première surface de section transversale et une seconde partie axiale (3) avec une seconde surface de section transversale et avec lequel les deux parties axiales (2, 3) du corps creux sont reliées l'une à l'autre grâce à une transition de forme (8) s'étendant essentiellement dans un plan radial, c'est-à-dire grâce à une transition de forme, laquelle présente un écart maximal de +/- 20° par rapport à la perpendiculaire à la direction axiale, avec lequel un corps de préforme (1) est fabriqué à partir d'une platine, lequel présente au moins une région de transition (4) s'étendant en direction axiale du corps creux à fabriquer et disposée entre les première et seconde parties axiales (2, 3), moyennant quoi dans la région de transition (4), la surface de section transversale du corps de préforme (1) varie de préférence de manière continue de la surface de section transversale de la première partie axiale (2) jusqu'à la surface de section transversale de la seconde partie axiale (3),
    le corps de préforme (1) étant reçu dans une matrice (5), la matrice (5) présentant la forme extérieure finale du corps creux à fabriquer,
    un mandrin de façonnage (7) étant introduit dans le corps de préforme (1), le mandrin de façonnage (7) présentant la forme intérieure du corps creux à fabriquer,
    un déplacement axial du mandrin de façonnage (7) permettant de comprimer le corps de préforme (1) dans la matrice (5) pour l'obtention de la forme finale du corps creux,
    caractérisé en ce que le corps de préforme (1) est fabriqué à partir d'au moins une platine en faisant appel à une technique d'enroulement ou bien grâce à une déformation U-O et en ce que la longueur de la région de transition (4) du corps de préforme (1) est choisie en fonction de l'épaisseur de paroi de la platine déformée, du changement de forme de la transition de forme et en fonction du matériau de manière à ce que la variation maximale de l'épaisseur de tôle en direction axiale du corps creux, en particulier dans la zone de transition de forme (8), soit de ± 15%.
  2. Procédé selon la revendication 1, caractérisé en ce que le corps de préforme (1) présente, dans au moins une partie axiale (2, 3), la forme extérieure et intérieure du corps creux à fabriquer.
  3. Procédé selon l'une des revendications 1 à 2, caractérisé en ce que des éléments fonctionnels et/ou des éléments moulés accessoires sont introduits dans le corps creux à fabriquer.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que l'on utilise pour la fabrication du corps de préforme (1) des platines en acier, en un alliage d'acier, en particulier à base d'aciers à haute résistance.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le corps de préforme (1) est fabriqué à partir de «flans sur mesure».
  6. Dispositif pour la fabrication d'un corps creux en métal, lequel présente au moins une première partie axiale (2) avec une première surface de section transversale et une seconde partie axiale (3) avec une seconde surface de section transversale et avec lequel les deux parties axiales (2, 3) sont juxtaposées l'une à l'autre en direction axiale du corps creux grâce à une transition de forme (8) s'étendant essentiellement dans un plan radial, c'est-à-dire grâce à une transition de forme, laquelle présente un écart maximal de +/- 20° par rapport à la perpendiculaire à la direction axiale, en particulier pour la mise en oeuvre d'un procédé selon l'une des revendications 1 à 5,
    caractérisé en ce que l'on prévoit une première matrice (10) pour la fabrication d'un corps de préforme (1) à partir d'une platine en faisant appel à une technique d'enroulement ou bien grâce à un procédé de déformation U-O, la première matrice (10) étant réalisée de manière à ce que le corps de préforme (1) présente au moins une région de transition (4) s'étendant en direction axiale du corps creux à fabriquer et disposée entre les première et seconde parties axiales (2, 3) et dans la région de transition (4), la surface de section transversale du corps de préforme (1) variant de préférence de manière continue de la surface de section transversale de la première partie axiale (2) jusqu'à la surface de section transversale de la seconde partie axiale (3), et au moins une deuxième matrice (5) pour la réception du corps de préforme (1) fabriqué étant prévue avec un mandrin de façonnage (7), la deuxième matrice (5) présentant la forme extérieure finale du corps creux, le mandrin de façonnage (7) présentant la forme finale intérieure du corps creux à fabriquer et le mandrin de façonnage (7) pouvant être déplacé axialement par rapport à la deuxième matrice (5).
  7. Dispositif selon la revendication 6, caractérisé en ce que la première et/ou la deuxième matrice (10, 5) et/ou le mandrin de façonnage (7) présente(nt) des moyens pour introduire des éléments fonctionnels et/ou des éléments moulés accessoires dans le corps creux.
  8. Dispositif selon la revendication 6 ou 7, caractérisé en ce que l'on prévoit des moyens pour le transport automatique d'une platine dans la première matrice (10) du dispositif (9) et/ou des moyens pour placer le corps de préforme dans la deuxième matrice et/ou des moyens pour retirer le corps creux de la deuxième matrice.
  9. Corps creux en métal, lequel présente au moins une première partie axiale (2) avec une première surface de section transversale et une seconde partie axiale (3) avec une seconde surface de section transversale et dans lequel les deux parties axiales (2, 3) du corps creux sont reliées l'une à l'autre grâce à une transition de forme (8) s'étendant dans un plan radial, fabriqué grâce à un procédé selon les revendications 1 à 5, en particulier en faisant appel à un dispositif selon les revendications 6 à 8, la variation maximale de l'épaisseur de tôle en direction axiale du corps creux, en particulier dans la zone de transition de forme (8), étant de ± 15%.
  10. Corps creux selon la revendication 9, caractérisé en ce que le corps creux est fabriqué en acier, en un alliage d'acier et/ou des aciers à haute résistance.
EP08838645A 2007-10-18 2008-10-17 Procede et dispositif de fabrication d'un corps creux et corps creux Not-in-force EP2205370B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007050337A DE102007050337B4 (de) 2007-10-18 2007-10-18 Formgestauchter Hohlkörper
PCT/EP2008/064047 WO2009050270A1 (fr) 2007-10-18 2008-10-17 Procédé et dispositif de fabrication d'un corps creux et corps creux

Publications (2)

Publication Number Publication Date
EP2205370A1 EP2205370A1 (fr) 2010-07-14
EP2205370B1 true EP2205370B1 (fr) 2012-12-19

Family

ID=40297920

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08838645A Not-in-force EP2205370B1 (fr) 2007-10-18 2008-10-17 Procede et dispositif de fabrication d'un corps creux et corps creux

Country Status (5)

Country Link
US (1) US9283602B2 (fr)
EP (1) EP2205370B1 (fr)
DE (1) DE102007050337B4 (fr)
ES (1) ES2401306T3 (fr)
WO (1) WO2009050270A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018099744A1 (fr) 2016-12-01 2018-06-07 Linde + Wiemann SE & Co. KG Procédé et produit semi-fini pour la fabrication d'un élément profilé au moins partiellement durci

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1566645A (en) * 1925-12-22 Alfred b
DE19827798A1 (de) * 1998-06-23 1999-12-30 Thyssenkrupp Stahl Ag Verfahren und Vorrichtung zum Herstellen von längsnahtgeschweißten Rohren aus ebenen Blechzuschnitten
MXPA05011842A (es) * 2003-05-08 2006-05-25 Noble Metal Proc Inc Proceso para la formacion a presion de tubos de metal.
DE10329424B4 (de) * 2003-07-01 2005-04-28 Thyssenkrupp Stahl Ag Verfahren zum Herstellen eines längsgeschlitzten Hohlprofils mit mehreren, im Querschnitt verschiedenen Längsabschnitten aus einer ebenen Blechplatine
JP2005279706A (ja) 2004-03-29 2005-10-13 Calsonic Kansei Corp 金属管の端部縮径加工方法および装置
JP2006002898A (ja) * 2004-06-18 2006-01-05 Calsonic Kansei Corp パイプの接続方法およびパイプの接続構造

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018099744A1 (fr) 2016-12-01 2018-06-07 Linde + Wiemann SE & Co. KG Procédé et produit semi-fini pour la fabrication d'un élément profilé au moins partiellement durci
DE102016123265A1 (de) 2016-12-01 2018-06-07 Linde + Wiemann SE & Co. KG Verfahren und Halbzeug zur Herstellung eines wenigstens partiell gehärteten Profilbauteils

Also Published As

Publication number Publication date
US20100294014A1 (en) 2010-11-25
US9283602B2 (en) 2016-03-15
WO2009050270A1 (fr) 2009-04-23
EP2205370A1 (fr) 2010-07-14
DE102007050337B4 (de) 2009-12-31
ES2401306T3 (es) 2013-04-18
DE102007050337A1 (de) 2009-04-23

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