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EP1648631B1 - Method for producing from a metal sheet a hollow profile which is longitudinally slotted and provided with several longitudinal segments having different cross sections - Google Patents

Method for producing from a metal sheet a hollow profile which is longitudinally slotted and provided with several longitudinal segments having different cross sections Download PDF

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Publication number
EP1648631B1
EP1648631B1 EP04740154A EP04740154A EP1648631B1 EP 1648631 B1 EP1648631 B1 EP 1648631B1 EP 04740154 A EP04740154 A EP 04740154A EP 04740154 A EP04740154 A EP 04740154A EP 1648631 B1 EP1648631 B1 EP 1648631B1
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EP
European Patent Office
Prior art keywords
hollow profile
metal sheet
die
longitudinal
segment
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
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EP04740154A
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German (de)
French (fr)
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EP1648631A1 (en
Inventor
Lothar HÖMIG
Uwe Kneiphoff
Thomas Flehmig
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
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ThyssenKrupp Steel AG
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Publication of EP1648631A1 publication Critical patent/EP1648631A1/en
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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, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles 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
    • B21C37/065—Manufacture of metal sheets, rods, wire, tubes, profiles 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 starting from a specific blank, e.g. tailored blank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles 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
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles 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

Definitions

  • the invention relates to a method for producing a longitudinally slotted hollow profile, in particular as a precursor of a longitudinally welded hollow profile, from a flat sheet metal blank, which consists of a plurality of longitudinal sections different in cross-section, of which at least one section over its length is increased or decreased.
  • Hollow profiles of this type can be produced in various ways.
  • document US-A-4,148,426 discloses a method for producing a hollow profile from a one-piece planar blank. This blank is first formed U-shaped in a lower die half and then formed with an upper die half to the finished longitudinally slotted hollow profile. In another manufacturing method, the hollow profile is welded together from individual blanks.
  • the hollow profile is made of a one-piece blank.
  • the hollow profile can be widened by hydroforming. If you wanted to produce a hollow profile shape of the example described, then the cross-sectional widening would go fully at the expense of wall thickness. Therefore, this production method is of limited use.
  • the invention is based on the issue to develop a little complex manufacturing process for hollow sections with longitudinally different cross-sections of sheet metal blanks, in which it is only to a limited extent undesirable local material thinning and virtually none Wrinkling comes.
  • the hollow profile should be as homogeneous as possible over its entire surface, in order to be able to be reshaped without damage.
  • the U-shaped deformation takes place already in the first die half, in particular using a correspondingly profiled core.
  • the invention is based on the idea that in the transition areas, where due to the settlement of the hollow section material shortage or material surplus, which could be compensated during the forming of the hollow profile by stretching (thinning) or compression (thickening) of the wall, this lack of material or this excess material the rounded or rounded edge regions is compensated for corresponding material displacement, so that in the die a hollow profile is made even with diametrically different longitudinal sections without significant thinning and thickening in the critical transition areas of a single blank. It will be understood that “rounded” and “rounded” are not strictly arcuate cut edges, but all cut edges are detected that do not have the otherwise sharp corners at the transitions, especially edges that follow a polynomial, continuous curve.
  • the blank can be bent inwardly at the longitudinal edges before forming in the die.
  • the bending radius of the bent longitudinal edges should be at most equal to the smallest radius of curvature of the hollow profile.
  • a hollow profile 1 is formed according to Figure 5, which is composed of three longitudinal sections 2, 3, 4, namely a cylindrical longitudinal section 2 with a small diameter, a conically widening longitudinal section 3 and a cylindrical longitudinal section 4 larger diameter. Accordingly, the blank of the sheet metal blank can be divided into three areas 5, 6, 7. The regions 5 and 7 have a substantially rectangular cross section, while the intermediate region 6 has a substantially trapezoidal cross section.
  • a special feature in This blank 5, 6, 7 consists in that in the transition areas 8, 9 between the areas 5, 6, 7 the otherwise straight cut edges are rounded, namely the cut edges 8a, 8b are rounded off from the smaller rectangular area 5 to the trapezoidal area 6 while the cut edges 9a, 9b are rounded off from the trapezoidal region 6 to the larger rectangular region 7.
  • additional material is made available for the transition region 8, while material is removed for the transition region 9.
  • a lack of material in the regions 8c, 8d of the transition region 8 and a surplus of material in the regions 9c, 9d of the transitional region 9 is compensated, which would result in unwinding of the hollow profile to be formed in the plane.
  • This principle of the provision of material or the removal of material at transition areas 8, 9 which is shown in the embodiment for a simple geometric shape, can be realized even in more complicated hollow profile shapes, even in elliptical, rectangular and various transition areas, for example from round to rectangular and the same.
  • FIG. 1 The reshaping of the blank according to FIG. 1 to the hollow profile of FIG. 5 takes place stepwise.
  • FIG. 2 shows the blank prepared in this way for the actual forming.
  • This blank 5, 6, 7 is then formed with its longitudinally extending central region in a first die half 10a of a later hollow profile fitted die 10a, 10b with the aid of a core 11, so that a U-shaped molding with upright Legs 12a, 12b arises.
  • a first die half 10a of a later hollow profile fitted die 10a, 10b with the aid of a core 11, so that a U-shaped molding with upright Legs 12a, 12b arises.
  • the first die half 10a material is shifted in the transition regions 8, 9, so that it comes only to a very limited extent to compression and thickening of material or thinning in the transition areas.
  • the legs 12a, 12b are bent toward one another with a second die half 10b, if necessary after removal of the core 11, until they bear against the die half 10b when the second die half 10b is lowered, until the die 10a, 10b is complete closed is.
  • a core 11 supported by the sword 13 serves as a centering for the longitudinal edges.
  • the longitudinal edges After removal of the molded to the hollow profile board, the longitudinal edges abut each other and form a linear weldable edge impact.
  • the preformed hollow profile produced in this way is available after longitudinal seam welding for further forming processes, for example hydroforming, in which case it only needs to be deformed comparatively little because of the preform.
  • the sword 13 takes over the management task together with the second die half 10b. It is also understood that the sword 13 can be kept arbitrary, for example, on the second die half 10b.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

A method for producing hollow profiles provided with different cross sections along the length thereof includes shaping the profiles in a die from one piece of cut metal sheet. According to said method, a convex or concave rounding produced on the edges of a longitudinal section results in material excess or material shortage in the transition regions, thereby preventing the material thinning or thickening in said transition regions during forming.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines längsgeschlitzten Hohlprofils, insbesondere als Vorprodukt eines längsnahtgeschweißten Hohlprofils, aus einer ebenen Blechplatine, das aus mehreren im Querschnitt verschiedenen Längsabschnitten besteht, von denen mindestens ein Abschnitt über seine Länge sich vergrößert oder verkleinert.The invention relates to a method for producing a longitudinally slotted hollow profile, in particular as a precursor of a longitudinally welded hollow profile, from a flat sheet metal blank, which consists of a plurality of longitudinal sections different in cross-section, of which at least one section over its length is increased or decreased.

Hohlprofile dieser Art können auf verschiedene Art und Weise hergestellt werden. Dokument US-A-4 148 426 offenbart ein Verfahren zur Herstellung eines Hohlprofils aus einem einteiligen ebenen Zuschnitt. Dieser Zuschnitt wird zunächst in einer unteren Gesenkhälfte u-förmig umgeformt und anschließend mit einer oberen Gesenkhälfte zum fertigen längsgeschlitzten Hohlprofil ausgebildet. Bei einem anderen Herstellungsverfahren ist das Hohlprofil aus einzelnen Zuschnitten zusammengeschweißt. So hat ein Hohlprofil mit einem im Durchmesser kleinen zylindrischen Längsabschnitt, einem sich anschließenden konischen Längsabschnitt und einem sich daran anschließenden im Durchmesser größeren zylindrischen Längsabschnitt zwar insgesamt eine konstante Wandstärke, doch ist seine Herstellung wegen der einzeln zuzuschneidenden, dann zu formenden und anschließend zusammenzuschweißenden Längsabschnitte aufwendig. Hinzu kommt, dass die Schweißnähte Orte von Inhomogenitäten bilden, die für eine umformende Weiterverarbeitung, zum Beispiel Innenhochdruckumformen, von Nachteil und Ausgangspunkte für eine Rissbildung bei weiterer Umformung und beim späteren betrieblichen Einsatz sind.Hollow profiles of this type can be produced in various ways. document US-A-4,148,426 discloses a method for producing a hollow profile from a one-piece planar blank. This blank is first formed U-shaped in a lower die half and then formed with an upper die half to the finished longitudinally slotted hollow profile. In another manufacturing method, the hollow profile is welded together from individual blanks. Thus, a hollow profile with a small diameter cylindrical longitudinal section, a subsequent conical longitudinal section and an adjoining larger diameter cylindrical longitudinal section while overall a constant wall thickness, but its production is complicated because of the individually zuzuschneidenden, then to be formed and then zusammengeschweißenden longitudinal sections , In addition, the welds form places of inhomogeneities, which are used for forming, for Example hydroforming, disadvantageous and starting points for cracking during further forming and later operational use are.

Bei einem anderen bekannten Herstellungsverfahren wird das Hohlprofil aus einem einteiligen Zuschnitt gefertigt. Um in einzelnen Längsabschnitten unterschiedliche Querschnitte zu erhalten, kann das Hohlprofil durch Innenhochdruckumformen aufgeweitet werden. Würde man eine Hohlprofilform des beschriebenen Beispiels herstellen wollen, dann würde die Querschnittserweiterung voll zu Lasten der Wandstärke gehen. Deshalb ist dieses Herstellungsverfahren nur eingeschränkt brauchbar.In another known manufacturing method, the hollow profile is made of a one-piece blank. In order to obtain different cross sections in individual longitudinal sections, the hollow profile can be widened by hydroforming. If you wanted to produce a hollow profile shape of the example described, then the cross-sectional widening would go fully at the expense of wall thickness. Therefore, this production method is of limited use.

Schließlich ist ein zweistufiges Verfahren zum Herstellen eines Hohlprofils mit Flansch bekannt ( DE 199 05 365 A1 ), bei dem in einer ersten Stufe ein ansonsten rechteckförmiges Hohlprofil mit einem hakenförmigen Flansch und einer stufenförmigen Einbuchtung hergestellt wird. Um den Querschnitt dieses Hohlprofils zu vergrößern, wird es in einer nachfolgenden Stufe durch Innenhochdruck aufgeweitet und erhält damit seine endgültige Form. Die zuvor geschilderte Problematik der Wandstärkenveränderung beim Innenhochdruckumformen infolge unterschiedlicher Querschnitte in einzelnen Längsabschnitten des Hohlprofils ist bei diesem Stand der Technik nicht behandelt.Finally, a two-stage process for producing a hollow profile with flange is known (US Pat. DE 199 05 365 A1 ), in which in a first stage an otherwise rectangular hollow profile is produced with a hook-shaped flange and a stepped indentation. In order to increase the cross section of this hollow profile, it is expanded in a subsequent stage by internal high pressure and thus receives its final shape. The above-described problem of changing the wall thickness during hydroforming as a result of different cross sections in individual longitudinal sections of the hollow profile is not dealt with in this prior art.

Der Erfindung liegt die Ausgabe zugrunde, ein wenig aufwendiges Herstellungsverfahren für Hohlprofile mit in Längsrichtung unterschiedlichen Querschnitten aus Blechzuschnitten zu entwickeln, bei dem es allenfalls nur in geringem Umfang zu unerwünschten örtlichen Materialausdünnungen und praktisch zu keiner Faltenbildung kommt. Das Hohlprofil soll über seine gesamte Oberfläche möglichst homogen sein, um schadlos weiter umgeformt werden zu können.The invention is based on the issue to develop a little complex manufacturing process for hollow sections with longitudinally different cross-sections of sheet metal blanks, in which it is only to a limited extent undesirable local material thinning and virtually none Wrinkling comes. The hollow profile should be as homogeneous as possible over its entire surface, in order to be able to be reshaped without damage.

Diese Aufgabe wird bei einem Verfahren der eingangs genannten Art durch folgende Merkmale gelöst:

  • Es wird von einem einteiligen Zuschnitt der Blechplatine ausgegangen, die an jedem Übergangsbereich von einem kleinen Querschnitt auf einen größeren Querschnitt des späteren Hohlprofils beziehungsweise umgekehrt ausgerundete beziehungsweise abgerundete Längsschnittkanten zur Bereitstellung von Ausgleichsmaterial für einen Materialmangel beziehungsweise Materialüberschuss in jedem Übergangsbereich beim späteren Umformen aufweist.
  • Der Zuschnitt wird in seinem sich in Längsrichtung erstreckenden mittleren Bereich unter Verlagerung vom Material zum Ausgleich von Materialmangel beziehungsweise Materialüberschuss in jedem Übergangsbereich U-förmig verformt.
  • Der U-förmig verformte Zuschnitt wird mit seinem geschlossenen Bereich in eine erste Gesenkhälfte eines dem Hohlprofil entsprechenden Gesenks eingesetzt.
  • Die Schenkel des U-förmig verformten Zuschnittes werden mit einer zweiten Hälfte des Gesenks unter Einsatz eines Führungsschwertes für die Längsschnittkanten zusammengeführt, wobei Material in jedem Übergangsbereich zum Ausgleich von Materialmangel beziehungsweise Materialüberschuss verlagert wird.
  • Entformen des Hohlprofils.
This object is achieved in a method of the type mentioned by the following features:
  • It is assumed that a one-piece blank of the metal sheet, which has at each transition region from a small cross section to a larger cross section of the later hollow profile or vice versa rounded or rounded longitudinal edges to provide compensation material for a lack of material or excess material in each transition region during subsequent forming.
  • The blank is U-shaped in its longitudinally extending central region under displacement of the material to compensate for material shortage or excess material in each transition region.
  • The U-shaped shaped blank is inserted with its closed area in a first die half of a die corresponding to the hollow profile.
  • The legs of the U-shaped blank are joined to a second half of the die using a guide blade for the longitudinal edges, with material in each transition region to compensate for material shortage or excess material is relocated.
  • Removal of the hollow profile.

Vorzugsweise erfolgt die U-förmige Verformung bereits in der ersten Gesenkhälfte insbesondere unter Verwendung eines entsprechend profilierten Kerns.Preferably, the U-shaped deformation takes place already in the first die half, in particular using a correspondingly profiled core.

Die Erfindung beruht auf dem Gedanken, dass in den Übergangsbereichen, wo aufgrund der Abwicklung des Hohlprofils Materialmangel beziehungsweise Materialüberschuss besteht, der beim Formen des Hohlprofils durch Strecken (Ausdünnen) oder Stauchen (Verdicken) der Wandung ausgeglichen werden könnte, dieser Materialmangel beziehungsweise dieser Materialüberschuss durch die ausgerundeten beziehungsweise abgerundeten Randbereiche bei entsprechender Materialverlagerung ausgeglichen wird, so dass im Gesenk ein Hohlprofil auch mit im Durchmesser unterschiedlichen Längsabschnitten ohne nennenswerte Ausdünnung und Verdickung auch in den kritischen Übergangsbereichen aus einem einzigen Zuschnitt hergestellt wird. Es versteht sich, dass von " abgerundet " und "ausgerundet" nicht streng kreisbogenförmige Schnittkanten, sondern alle Schnittkanten erfasst werden, die nicht die sonst scharfen Ecken an den Übergängen haben, insbesondere Kanten, die einem polynomischen, stetigen Kurvenverlauf folgen.The invention is based on the idea that in the transition areas, where due to the settlement of the hollow section material shortage or material surplus, which could be compensated during the forming of the hollow profile by stretching (thinning) or compression (thickening) of the wall, this lack of material or this excess material the rounded or rounded edge regions is compensated for corresponding material displacement, so that in the die a hollow profile is made even with diametrically different longitudinal sections without significant thinning and thickening in the critical transition areas of a single blank. It will be understood that "rounded" and "rounded" are not strictly arcuate cut edges, but all cut edges are detected that do not have the otherwise sharp corners at the transitions, especially edges that follow a polynomial, continuous curve.

Um das Umformen im Gesenk zu erleichtern, kann der Zuschnitt vor dem Umformen im Gesenk an seinen Längsrändern nach innen umgebogen werden. Dabei sollte der Biegeradius der umgebogenen Längsränder höchstens gleich dem kleinsten Krümmungsradius des Hohlprofils sein.In order to facilitate the forming in the die, the blank can be bent inwardly at the longitudinal edges before forming in the die. The bending radius of the bent longitudinal edges should be at most equal to the smallest radius of curvature of the hollow profile.

Im folgenden wird die Erfindung anhand einer Zeichnung näher erläutert. Im einzelnen zeigen:

Figur 1
einen Zuschnitt einer Blechplatine,
Figur 2
den Zuschnitt gemäß Figur 1 mit umgebogenen Längsrändern,
Figur 3
einen ersten Umformschritt des Zuschnittes gemäß Figur 1 und 2 in einem Gesenk mit einem Kern in perspektivischer Darstellung,
Figur 4
einen zweiten Umformschritt des Zuschnittes gemäß Figur 1 und 2 in dem Gesenk der Figur 3 in perspektivischer Darstellung
u n d
Figur 5
das Hohlprofil nach dem Entformen in perspektivischer Darstellung.
In the following the invention will be explained in more detail with reference to a drawing. In detail show:
FIG. 1
a blank of a sheet metal blank,
FIG. 2
the blank according to FIG. 1 with bent longitudinal edges,
FIG. 3
1 shows a first forming step of the blank according to FIGS. 1 and 2 in a die with a core in perspective view,
FIG. 4
a second forming step of the blank according to Figures 1 and 2 in the die of Figure 3 in a perspective view
and
FIG. 5
the hollow profile after demolding in a perspective view.

Beim Ausführungsbeispiel wird aus einem einteiligen Zuschnitt einer Blechplatine ein Hohlprofil 1 entsprechend Figur 5 geformt, das sich aus drei Längsabschnitten 2, 3, 4 zusammensetzt, und zwar einem zylindrischen Längsabschnitt 2 mit einem kleinen Durchmesser, einem sich konisch erweiternden Längsabschnitt 3 und einem zylindrischen Längsabschnitt 4 größeren Durchmessers. Entsprechend lässt sich der Zuschnitt der Blechplatine in drei Bereiche 5, 6, 7 aufteilen. Die Bereiche 5 und 7 haben einen im wesentlichen rechteckförmigen Querschnitt, während der dazwischenliegende Bereich 6 einen im wesentlichen trapezförmigen Querschnitt aufweist. Eine Besonderheit bei diesem Zuschnitt 5, 6, 7 besteht darin, dass in den Übergangsbereichen 8, 9 zwischen den Bereichen 5, 6, 7 die sonst geraden Schnittkanten gerundet sind, und zwar sind die Schnittkanten 8a, 8b vom kleineren rechteckförmigen Bereich 5 zum trapezförmigen Bereich 6 ausgerundet, während die Schnittkanten 9a, 9b vom trapezförmigen Bereich 6 zum größeren rechteckförmigen Bereich 7 abgerundet sind. Dadurch wird für den Übergangsbereich 8 zusätzliches Material zur Verfügung gestellt, während für den Übergangsbereich 9 Material abgenommen ist. Mit dieser Materialzugabe beziehungsweise Materialabnahme wird ein Materialmangel in den Bereichen 8c, 8d des Übergangsbereichs 8 und ein Materialüberschuss in den Bereichen 9c, 9d des Übergangsbereichs 9 kompensiert, der sich bei Abwicklung des zu formenden Hohlprofils in die Ebene ergeben würde.In the embodiment of a one-piece blank of a sheet metal blank, a hollow profile 1 is formed according to Figure 5, which is composed of three longitudinal sections 2, 3, 4, namely a cylindrical longitudinal section 2 with a small diameter, a conically widening longitudinal section 3 and a cylindrical longitudinal section 4 larger diameter. Accordingly, the blank of the sheet metal blank can be divided into three areas 5, 6, 7. The regions 5 and 7 have a substantially rectangular cross section, while the intermediate region 6 has a substantially trapezoidal cross section. A special feature in This blank 5, 6, 7 consists in that in the transition areas 8, 9 between the areas 5, 6, 7 the otherwise straight cut edges are rounded, namely the cut edges 8a, 8b are rounded off from the smaller rectangular area 5 to the trapezoidal area 6 while the cut edges 9a, 9b are rounded off from the trapezoidal region 6 to the larger rectangular region 7. As a result, additional material is made available for the transition region 8, while material is removed for the transition region 9. With this material addition or removal of material, a lack of material in the regions 8c, 8d of the transition region 8 and a surplus of material in the regions 9c, 9d of the transitional region 9 is compensated, which would result in unwinding of the hollow profile to be formed in the plane.

Dieses Prinzip der Zurverfügungstellung von Material beziehungsweise der Wegnahme von Material an Übergangsbereichen 8, 9 der beim Ausführungsbeispiel für eine einfache geometrische Form dargestellt ist, lässt sich auch bei komplizierteren Hohlprofilformen verwirklichen, auch bei elliptischen, rechteckigen und verschiedenartigen Übergangsbereichen, zum Beispiel von rund auf rechteckig und dergleichen.This principle of the provision of material or the removal of material at transition areas 8, 9 which is shown in the embodiment for a simple geometric shape, can be realized even in more complicated hollow profile shapes, even in elliptical, rectangular and various transition areas, for example from round to rectangular and the same.

Die Umformung des Zuschnittes gemäß Figur 1 zum Hohlprofil der Figur 5 erfolgt schrittweise. Vorzugsweise werden zunächst die Längsränder 6a, 6b, 7a, 7b, 5a, 5b nach innen umgebogen, insbesondere mit einem Biegeradius, der höchstens gleich dem kleinsten Krümmungsradius des späteren Hohlprofils ist. In Figur 2 ist der so für die eigentliche Umformung vorbereitete Zuschnitt dargestellt.The reshaping of the blank according to FIG. 1 to the hollow profile of FIG. 5 takes place stepwise. Preferably, first the longitudinal edges 6a, 6b, 7a, 7b, 5a, 5b bent inwards, in particular with a bending radius which is at most equal to the smallest radius of curvature of the later hollow profile. FIG. 2 shows the blank prepared in this way for the actual forming.

Dieser Zuschnitt 5, 6, 7 wird dann entsprechend Figur 3 mit seinem in Längsrichtung sich erstreckenden mittleren Bereich in einer ersten Gesenkhälfte 10a eines dem späteren Hohlprofil angepassten Gesenks 10a, 10b unter Zuhilfenahme eines Kerns 11 eingeformt, so dass ein U-förmiges Formteil mit aufrechtstehenden Schenkeln 12a,12b entsteht. Schon bei diesem Umformschritt in der ersten Gesenkhälfte 10a wird in den Übergangsbereichen 8, 9 Material verlagert, so dass es allenfalls nur in sehr geringem Umfang zu Stauchungen und Materialverdickungen oder Ausdünnungen in den Übergangsbereichen kommt.This blank 5, 6, 7 is then formed with its longitudinally extending central region in a first die half 10a of a later hollow profile fitted die 10a, 10b with the aid of a core 11, so that a U-shaped molding with upright Legs 12a, 12b arises. Already at this forming step in the first die half 10a material is shifted in the transition regions 8, 9, so that it comes only to a very limited extent to compression and thickening of material or thinning in the transition areas.

In einem weiteren Umformschritt gemäß Figur 4 werden - gegebenenfalls nach Entfernen des Kerns 11 - die Schenkel 12a,12b mit einer zweiten Gesenkhälfte 10b aufeinander zu gebogen, indem sie sich beim Absenken der zweiten Gesenkhälfte 10b an dieser anlegen, bis das Gesenk 10a, 10b vollständig geschlossen ist. Dabei dient ein vom Kern 11 getragenes Schwert 13 als Zentrierung für die Längsschnittkanten. Auch bei diesem zweiten Umformschritt kommt es zu einer Materialverlagerung in den Übergangsbereichen 8, 9, so dass Materialausdünnungen oder Materialverdickungen im wesentlichen nicht auftreten.In a further forming step according to FIG. 4, the legs 12a, 12b are bent toward one another with a second die half 10b, if necessary after removal of the core 11, until they bear against the die half 10b when the second die half 10b is lowered, until the die 10a, 10b is complete closed is. Here, a core 11 supported by the sword 13 serves as a centering for the longitudinal edges. Also in this second forming step, there is a shift of material in the transition regions 8, 9, so that material thinning or material thickening does not occur substantially.

Nach Entformen der zum Hohlprofil umgeformten Platine stoßen die Längsschnittkanten aufeinander und bilden einen linearen schweißbaren Kantenstoß. Das so hergestellte vorgeformte Hohlprofil steht nach der Längsnahtschweißung für weitere Umformprozesse, zum Beispiel Innenhochdruckumformen, zur Verfügung, bei denen es dann wegen der Vorform nur noch vergleichsweise wenig verformt zu werden braucht.After removal of the molded to the hollow profile board, the longitudinal edges abut each other and form a linear weldable edge impact. The preformed hollow profile produced in this way is available after longitudinal seam welding for further forming processes, for example hydroforming, in which case it only needs to be deformed comparatively little because of the preform.

Es versteht sich, dass bei Hohlprofilen mit an beiden Enden kleineren Querschnitten als im mittleren Bereich der Kern für den zweiten Umformschritt entfernt werden muss. In diesem Fall übernimmt das Schwert 13 gemeinsam mit der zweiten Gesenkhälfte 10b die Führungsaufgabe. Es versteht sich auch, dass das Schwert 13 beliebig gehalten sein kann, beispielsweise auch an der zweiten Gesenkhälfte 10b.It is understood that in hollow sections with smaller cross-sections at both ends than in the central region of the core for the second forming step must be removed. In this case, the sword 13 takes over the management task together with the second die half 10b. It is also understood that the sword 13 can be kept arbitrary, for example, on the second die half 10b.

Claims (4)

  1. Method for producing from a flat metal sheet a hollow profile (1), which is longitudinally slotted, in particular as a pre-product of a longitudinal seam welded hollow profile, which consists of several longitudinal segments (2, 3, 4) having different cross sections, at least one longitudinal segment (3) of which becomes larger or smaller along its length, comprising the following features:
    - One starts with one piece of cut metal sheet (5, 6, 7), which at each transition segment (8, 9) from a small cross section to a larger cross section of the later hollow profile (1) has either concave and/or convex longitudinal profile edges (8a, 8b, 9a, 9b) in order to provide material to compensate for material shortage and/or material excess in each transition segment (8, 9) during later forming.
    - The cut metal sheet is formed as a U-shape in its central segment extending in the longitudinal direction, while material is transferred to compensate for material shortage and/or material excess in each transition segment (8, 9).
    - The U-shaped formed metal sheet with its closed segment is inserted into a first half (10a) of a die (10a, 10b) corresponding to the hollow profile (1).
    - The sides (12a, 12b) of the U-shaped formed metal sheet are brought together with a second half (10b) of the die (10a, 10b) using a guide blade (13) for the longitudinal edges, material being transferred in each transition segment (8, 9) to compensate for material shortage and/or material excess.
    - Release of the hollow profile (1) from the die.
  2. Method according to Claim 1, characterized in that the U-shaped formation of the cut metal sheet (5, 6, 7) takes place in the first die half (10a), in particular using a correspondingly shaped core (11).
  3. Method according to claim 1 or 2, characterized in that the cut metal sheet (5, 6, 7) is bent inwards along its longitudinal edges (5a, 5b, 6a, 6b, 7a, 7b) before shaping in the die (10a, 10b).
  4. Method according to Claim 3, characterized in that the bend radius of the bent longitudinal edges (5a, 5b, 6a, 6b, 7a, 7b) is at most equal to the smallest bend radius of the hollow profile (1).
EP04740154A 2003-07-01 2004-06-22 Method for producing from a metal sheet a hollow profile which is longitudinally slotted and provided with several longitudinal segments having different cross sections Expired - Lifetime EP1648631B1 (en)

Applications Claiming Priority (2)

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DE10329424A DE10329424B4 (en) 2003-07-01 2003-07-01 Method for producing a longitudinally slotted hollow profile with a plurality of longitudinal sections, which are different in cross-section, from a planar sheet metal blank
PCT/EP2004/006725 WO2005002753A1 (en) 2003-07-01 2004-06-22 Method for producing from a metal sheet a hollow profile which is longitudinally slotted and provided with several longitudinal segments having different cross sections

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EP (1) EP1648631B1 (en)
JP (1) JP4713471B2 (en)
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DE (2) DE10329424B4 (en)
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WO2005002753A1 (en) 2005-01-13
CN1816402B (en) 2011-12-14
US7637135B2 (en) 2009-12-29
ATE376462T1 (en) 2007-11-15
DE502004005330D1 (en) 2007-12-06
DE10329424A1 (en) 2005-01-27
CA2537664A1 (en) 2005-01-13
PT1648631E (en) 2008-02-01
JP2009513354A (en) 2009-04-02
US20070175261A1 (en) 2007-08-02
ES2295876T3 (en) 2008-04-16
EP1648631A1 (en) 2006-04-26
DE10329424B4 (en) 2005-04-28
JP4713471B2 (en) 2011-06-29
CN1816402A (en) 2006-08-09

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