EP2720813B1 - Method for producing slit hollow profiles - Google Patents

Method for producing slit hollow profiles Download PDF

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Publication number
EP2720813B1
EP2720813B1 EP12726804.3A EP12726804A EP2720813B1 EP 2720813 B1 EP2720813 B1 EP 2720813B1 EP 12726804 A EP12726804 A EP 12726804A EP 2720813 B1 EP2720813 B1 EP 2720813B1
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Prior art keywords
hollow profile
blank
length
areas
cross
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EP12726804.3A
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German (de)
French (fr)
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EP2720813A1 (en
EP2720813B2 (en
Inventor
Thomas Flehmig
Michael BRÜGGENBROCK
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel Europe AG
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    • 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
    • B21C37/065—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 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 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/01—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments
    • B21D5/015—Bending sheet metal along straight lines, e.g. to form simple curves between rams and anvils or abutments for making tubes

Definitions

  • the invention relates to a method for the production of slotted hollow profiles from a cut board, wherein the hollow profile of the substantially planar board using the Einrolltechnik or using a UO-forming is made, so that the hollow profile in the axial direction of a slot along the abutting edges the platinum blank has provided in the locally provided cross-sectional areas a greater circumferential length than the necessary Einformmother, so that in the forming of the platinum blank to a closed hollow profile, the opposite edges of the formed platinum blank abut each other and during the forming into the final shape at least the At the edge impact adjacent surfaces of the hollow profile in the circumferential direction are at least partially compressed.
  • slot profiles which from a substantially planar board using a UO-forming or using the Einrolltechnik, which is also known under the name InnForm T 3 ® technology of the Applicant, manufactured and joined cohesively along the longitudinal slot are known from the prior art.
  • a rolling-(InnForm T 3 ®) is the production of a hollow section of a platinum cut using a multi-page press, individual presses or press lines, For example, as a follow-on composite, understood, with the presses usually flat platinum blank usually by forming and bending operations with or without the use of a mold core reshape.
  • a substantially planar board blank is first formed into a U-shape using a corresponding punch and die, and then formed into an O-shape using a second die.
  • the UO-forming can also be done in press lines. Both in the application of Einrolltechnik as well as when using the UO-forming but it comes to spring back and elastic and / or plastic distortions in the sheet metal plane, so that the required dimensional and dimensional accuracy when joining a closed hollow profile is not sufficient.
  • the springbacks and distortions of the board material which occur especially in higher-strength and ultra-high strength steels, cause deviations from the desired contour at the edge impact occur before welding.
  • the slot of the hollow profile for example, deviations from its nominal width, so that problems in welding the slotted hollow profiles can occur.
  • German patent DE 103 29 424 B4 It is known to select the board blank in the production of hollow profiles with a longitudinally variable cross-section so that in the transition areas, a material surplus or a lack of material is provided so that no material thickening or thinning at the transition areas occur when forming the hollow profile.
  • German patent specification DE 100 45 938 C1 a method for the production of closed hollow profiles, in which the opposite edges of the board blank can be completely brought to shock in order to be able to be welded in a simple manner without using filler materials can. This is achieved by first bending or roll forming the board blank in a form-bending tool so that the longitudinal edges of the blank are bumped.
  • the sheet metal blank is compressed by an axial punch in the axial direction, so that the abutting edges abut properly on impact and a Peripheral bead is generated in the truncated cone sections of the hollow profile.
  • this axial compression requires an additional Axialstempel and basically still another step.
  • the present invention has the object to provide a method for the production of closed hollow profiles available with which in a simple way combinatorial slotted hollow profiles can be produced, which can be easily joined to closed hollow sections.
  • the object is achieved in the generic method in that the excess length of the circumferential length of the blank sheet is distributed symmetrically on both edge regions.
  • the excess length is distributed symmetrically on both edge regions, in order to facilitate the forming of the board blank and the upsetting of the hollow profile.
  • the provision of dimensionally stable edge impact of the slotted hollow profile can be provided by the fact that the excess length of the peripheral length of the board cut in the locally provided cross-sectional areas is at least 1% to 10%, preferably 2% to 5% of the necessary Einformpen ,
  • the nominal circumferential length in the locally provided cross-sectional areas corresponds to the actual required extent for providing the cross-sectional area in this area.
  • the method according to the invention can be further improved by upsetting the hollow profile over its entire cross section. This is the case in particular if the hollow profile has a round, for example a circular or an elliptical cross-sectional area.
  • the hollow profile is compressed along the entire edge impact. This ensures that the springback of the hollow profile over the entire axial length of the edge impact is reduced and thus a high-dimensional edge impact can be provided.
  • the hollow profile produced has a round cross-section at least in regions, the hollow profile in these regions can be compressed over the entire cross-section via the method according to the invention.
  • the hollow profile produced at least partially a box-shaped or polygonal cross-section, so that in particular at least the voltage applied to the edge impact surfaces of the hollow profile can be compressed using the method according to the invention and also a high-dimensional edge impact can be provided.
  • the method according to the invention can be applied to any desired cross-sectional shape, wherein any combination, for example round / elliptical / box-shaped, is also possible in the longitudinal direction.
  • the excess length in particular in connection with the tool design, can also be dimensioned such that it has a minimization of springback in all other surfaces.
  • the method can be further developed in that the provided at the edge impact slot of the Hollow profile after forming, in particular using a laser beam is welded. Due to the high-dimensional edge joints, which can be realized with the method according to the invention, it does not matter in the production process according to the invention whether the closed hollow profile to be produced has regionally different cross-sectional areas. Regardless of how as well as the cross-sectional area itself is formed, a upsetting of the surfaces involved in the edge impact surfaces of the hollow profile and thus a dimensionally stable formation of edge impact occurs via the inventive method.
  • Fig. 1 in a perspective view a board blank 1 shown, which at the edge regions 1a, 1b, which form the later edge impact of the hollow profile, has a length excess.
  • the necessary Einformin, ie the circumferential length of the board is marked, which is needed for the provision of the cross-sectional area.
  • Fig. 2, 3 and 4 Now, the individual forming steps of a UO deformation of the board blank 1 are shown in a perspective view.
  • the board blank 1 is first formed into a U-shape, Fig. 2 , This is usually done with a first die half using a punch, which transforms the flat board blank 1 in the U-shape.
  • As the board is further reshaped, as in FIG Fig.
  • the U-shape initially closed this is often achieved using an upper die half, so that the edge portions 1a, 1b of the board blank 1 abut against each other.
  • the edge portions 1a, 1b abut each other and lead to a compression of the hollow profile over the entire cross section. Due to the compression, the springback of the board blank is greatly reduced, so that a particularly dimensionally stable longitudinal slot 2 of the hollow profile can be made available.
  • the compression of the hollow profile takes place in the circumferential direction, as the arrows in Fig. 4 suggest.
  • the Longitudinal slot 2 is particularly suitable for carrying out a laser beam welding, since the laser beam welding requires due to the small extent of the weld zone special requirement for dimensional accuracy of the slot.
  • Fig. 4 can be seen, the formed into a longitudinally slotted hollow profile board blank 1 is compressed over its entire axial length in the circumferential direction. However, it is also conceivable to compress the board blank 1 only in the areas which are needed for the provision of a longitudinal slot to be welded.
  • FIG. 5 Another embodiment of a board blank 3 shows Fig. 5 in a perspective view.
  • the board blank 3 is intended for the use of Einrolltechnik.
  • a substantially flat board blank is preferably formed into a hollow profile using a multi-side press, single presses or press lines using a mandrel 4.
  • Fig. 5 3a, 3b denotes the circumferential length provided for the provision of the local cross section.
  • the beyond edge regions of the board blank 3 are used according to the invention for compression of the board blank during the forming of the board blank 3 in the final form.
  • the length excess of the board blank 3 can be varied in the circumferential direction variable depending on the shape of the hollow profile to be produced. It has been found that a choice of the length excess in the circumferential length of the blank blank of at least 1% to 10% of the necessary circumferential length or the Einformin, preferably 2% to 5% of the necessary Einformin particularly good results in terms of providing highly dimensionally, longitudinally slotted hollow profiles leads.
  • Fig. 6 the board cut already formed into a preform 3, which is formed using a mandrel 4, a lower die half 5 and an upper die half 6 to the final shape.
  • the over the axial length provided length excess of Blankenzuitess in the circumferential direction is used to compress the hollow profile to be produced before forming in the final shape, so that the springback is significantly reduced during the deformation of the board blank to a slotted hollow profile.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von geschlitzten Hohlprofilen aus einer zugeschnittenen Platine, bei welchem das Hohlprofil aus der im Wesentlichen ebenen Platine unter Anwendung der Einrolltechnik oder unter Anwendung einer U-O-Umformung hergestellt wird, so dass das Hohlprofil in Axialrichtung einen Schlitz entlang der Stoßkanten der umgeformten Platine aufweist, wobei der Platinenzuschnitt in den lokal vorgesehenen Querschnittsflächen eine größere Umfangslänge als die notwendige Einformlänge bereitstellt, so dass bei dem Umformen des Platinenzuschnitts zu einem geschlossenen Hohlprofil die gegenüberliegenden Kanten des umgeformten Platinenzuschnitts aneinander stoßen und während des Umformens in die Endform zumindest die an den Kantenstoß angrenzenden Flächen des Hohlprofils in Umfangsrichtung zumindest teilweise gestaucht werden.The invention relates to a method for the production of slotted hollow profiles from a cut board, wherein the hollow profile of the substantially planar board using the Einrolltechnik or using a UO-forming is made, so that the hollow profile in the axial direction of a slot along the abutting edges the platinum blank has provided in the locally provided cross-sectional areas a greater circumferential length than the necessary Einformlänge, so that in the forming of the platinum blank to a closed hollow profile, the opposite edges of the formed platinum blank abut each other and during the forming into the final shape at least the At the edge impact adjacent surfaces of the hollow profile in the circumferential direction are at least partially compressed.

Die Herstellung von geschlitzten Hohlprofilen, sogenannten Schlitzprofilen, welche aus einer im Wesentlichen ebenen Platine unter Anwendung einer U-O-Umformung oder unter Anwendung der Einrolltechnik, welche auch unter der Bezeichnung InnForm T3® Technologie der Anmelderin bekannt ist, hergestellt und entlang des Längsschlitzes stoffschlüssig gefügt werden, ist aus dem Stand der Technik bekannt. Als Einrolltechnik (InnForm T3®) wird die Herstellung eines Hohlprofils aus einem Platinenzuschnitt unter Verwendung einer Mehrseitenpresse, Einzelpressen oder Pressenlinien, beispielsweise als Folgeverbund, verstanden, wobei die Pressen den zumeist flachen Platinenzuschnitt üblicherweise durch Umform- und Biegeoperationen mit oder ohne die Verwendung eines Formkerns umformen. Bei einer U-O-Umformung wird üblicherweise ein im Wesentlichen ebener Platinenzuschnitt zunächst in eine U-Form unter Verwendung eines entsprechenden Stempels und eines Untergesenks umgeformt und anschließend unter Verwendung eines zweiten Obergesenks in eine O-Form umgeformt. Die U-O-Umformung kann auch in Pressenlinien erfolgen. Sowohl bei der Anwendung der Einrolltechnik als auch bei der Verwendung der U-O-Umformung kommt es allerdings zu Rückfederungen und elastischen und/oder plastischen Verzerrungen in der Blechebene, so dass die geforderte Form- und Maßhaltigkeit beim Fügen zu einem geschlossenen Hohlprofil nicht ausreichend gegeben ist. Die Rückfederungen und Verzerrungen des Platinenmaterials, welche insbesondere bei höherfesten und höchstfesten Stählen verstärkt auftreten, führen dazu, dass Abweichungen von der Sollkontur am Kantenstoß vor dem Verschweißen auftreten. Im Ergebnis weist der Schlitz des Hohlprofils beispielsweise Abweichungen von seiner Sollbreite auf, so dass Probleme beim Schweißen der geschlitzten Hohlprofile auftreten können.The production of slotted hollow profiles, so-called slot profiles, which from a substantially planar board using a UO-forming or using the Einrolltechnik, which is also known under the name InnForm T 3 ® technology of the Applicant, manufactured and joined cohesively along the longitudinal slot are known from the prior art. As a rolling-(InnForm T 3 ®) is the production of a hollow section of a platinum cut using a multi-page press, individual presses or press lines, For example, as a follow-on composite, understood, with the presses usually flat platinum blank usually by forming and bending operations with or without the use of a mold core reshape. Typically, in a UO forming, a substantially planar board blank is first formed into a U-shape using a corresponding punch and die, and then formed into an O-shape using a second die. The UO-forming can also be done in press lines. Both in the application of Einrolltechnik as well as when using the UO-forming but it comes to spring back and elastic and / or plastic distortions in the sheet metal plane, so that the required dimensional and dimensional accuracy when joining a closed hollow profile is not sufficient. The springbacks and distortions of the board material, which occur especially in higher-strength and ultra-high strength steels, cause deviations from the desired contour at the edge impact occur before welding. As a result, the slot of the hollow profile, for example, deviations from its nominal width, so that problems in welding the slotted hollow profiles can occur.

Aus der deutschen Patentschrift DE 103 29 424 B4 ist bekannt, den Platinenzuschnitt bei der Herstellung von Hohlprofilen mit in Längsrichtung veränderlichem Querschnitt so zu wählen, dass in den Übergangsbereichen ein Materialüberschuss oder ein Materialmangel bereitgestellt wird, so dass beim Umformen zum Hohlprofil keine Materialverdickungen oder -verdünnungen an den Übergangsbereichen auftreten. Dagegen betrifft die deutsche Patentschrift DE 100 45 938 C1 ein Verfahren zur Herstellung von geschlossenen Hohlprofilen, bei welchem die einander gegenüberliegenden Kanten des Platinenzuschnitts vollständig auf Stoß gebracht werden können, um auf einfache Weise ohne Verwendung von Zusatzwerkstoffen verschweißt werden zu können. Dies wird dadurch erreicht, dass in einem Form-Biegewerkzeug der Platinenzuschnitt zunächst gebogen oder rollgeformt wird, so dass die Längskanten des Zuschnitts auf Stoß gebracht werden. Während dieses Biege- oder Rollformvorganges wird der Blechzuschnitt über einen Axialstempel in Axialrichtung gestaucht, so dass die Stoßkanten einwandfrei auf Stoß anliegen und eine Umfangswulst in den Kegelstumpfabschnitten des Hohlprofils erzeugt wird. Diese axiale Stauchung erfordert jedoch einen zusätzlichen Axialstempel und grundsätzlich noch einen weiteren Arbeitsschritt.From the German patent DE 103 29 424 B4 It is known to select the board blank in the production of hollow profiles with a longitudinally variable cross-section so that in the transition areas, a material surplus or a lack of material is provided so that no material thickening or thinning at the transition areas occur when forming the hollow profile. By contrast, the German patent specification DE 100 45 938 C1 a method for the production of closed hollow profiles, in which the opposite edges of the board blank can be completely brought to shock in order to be able to be welded in a simple manner without using filler materials can. This is achieved by first bending or roll forming the board blank in a form-bending tool so that the longitudinal edges of the blank are bumped. During this bending or roll forming process, the sheet metal blank is compressed by an axial punch in the axial direction, so that the abutting edges abut properly on impact and a Peripheral bead is generated in the truncated cone sections of the hollow profile. However, this axial compression requires an additional Axialstempel and basically still another step.

Von diesem Stand der Technik ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein Verfahren zur Herstellung von geschlossenen Hohlprofilen zur Verfügung zu stellen, mit welchem auf einfache Weise hochmaßhaltige, geschlitzte Hohlprofile hergestellt werden können, welche leicht zu geschlossenen Hohlprofilen gefügt werden können.Based on this prior art, the present invention has the object to provide a method for the production of closed hollow profiles available with which in a simple way hochmaßhaltige slotted hollow profiles can be produced, which can be easily joined to closed hollow sections.

Nach der Lehre der vorliegenden Erfindung wird die Aufgabe bei dem gattungsgemäßen Verfahren dadurch gelöst, dass der Längenüberschuss der Umfangslänge des Platinenzuschnitts symmetrisch auf beide Kantenbereiche verteilt wird.According to the teachings of the present invention, the object is achieved in the generic method in that the excess length of the circumferential length of the blank sheet is distributed symmetrically on both edge regions.

Sowohl bei der Verwendung der Einrolltechnik (InnForm T3® als auch bei der Anwendung einer U-O-Umformung hat sich herausgestellt, dass es während des Umformverfahrens ein in Umfangsrichtung durchgeführtes Stauchen des geschlitzten Hohlprofils zu einer sauberen Ausbildung des Kantenstoßes des Hohlprofils kommt und die Rückfederung des fertigen Teils minimiert ist. Hierzu ist der Platinenzuschnitt in den beispielsweise lokal vorgesehenen Querschnittsflächen so zu wählen, dass der Platinenzuschnitt in diesen Bereichen eine größere Umfangslänge als die benötigte Einformlänge zur Verfügung stellt. Die Einformlänge ist das Maß des Platinenzuschnitts, welches dem lokal vorgesehenen Umfanges entspricht. Hierdurch wird automatisch bei der Verwendung der Einrolltechnik bzw. der U-O-Umformung eine Stauchung in Umfangsrichtung der Platine erreicht, wobei zumindest die unmittelbar an den Kantenstoß angrenzenden Flächen des Hohlprofils gestaucht werden. Dies reicht aus, um die Rückfederung deutlich zu minimieren und einen sauberen Kantenstoß am geschlitzten Hohlprofil zu erzeugen.Both when using the roll-in technique (InnForm T 3 ® as well as the application of a UO-forming has been found that during the forming process carried out in the circumferential direction upsetting the slotted hollow profile to a clean formation of edge impact of the hollow profile and the springback of the For this purpose, the blank cut in the, for example, locally provided cross-sectional areas should be selected so that the blank cut in these areas has a larger circumferential length than the required Einformlänge provides. The Einformlänge is the measure of the board blank, which corresponds to the locally intended extent. As a result, a compression in the circumferential direction of the board is automatically achieved when using the curling technique or the UO-forming, wherein at least the immediately adjacent to the edge impact surfaces of the hollow profile are compressed. This is sufficient to minimize the springback and to produce a clean edge impact on the slotted hollow profile.

Erfindungsgemäß wird der Längenüberschuss symmetrisch auf beide Kantenbereiche verteilt, um das Umformen des Platinenzuschnitts und das Stauchen des Hohlprofils zu erleichtern.According to the invention, the excess length is distributed symmetrically on both edge regions, in order to facilitate the forming of the board blank and the upsetting of the hollow profile.

Gemäß einer ersten vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens kann die Bereitstellung eines maßhaltigen Kantenstoßes des geschlitzten Hohlprofils dadurch bereitgestellt werden, dass der Längenüberschuss der Umfangslänge des Platinenzuschnitts in den lokal vorgesehen Querschnittsflächen mindestens 1% bis 10%, vorzugsweise 2% bis 5% der notwendigen Einformlänge beträgt. Die nominale Umfangslänge in den lokal vorgesehenen Querschnittsflächen entspricht dem tatsächlich benötigten Umfang zur Bereitstellung der Querschnittsfläche in diesem Bereich.According to a first advantageous embodiment of the method according to the invention, the provision of dimensionally stable edge impact of the slotted hollow profile can be provided by the fact that the excess length of the peripheral length of the board cut in the locally provided cross-sectional areas is at least 1% to 10%, preferably 2% to 5% of the necessary Einformlänge , The nominal circumferential length in the locally provided cross-sectional areas corresponds to the actual required extent for providing the cross-sectional area in this area.

Das erfindungsgemäße Verfahren kann dadurch weiterverbessert werden, dass das Hohlprofil über seinen gesamten Querschnitt gestaucht wird. Dies ist insbesondere der Fall, wenn das Hohlprofil eine runde, beispielsweise eine kreisförmige oder eine elliptische Querschnittsfläche aufweist.The method according to the invention can be further improved by upsetting the hollow profile over its entire cross section. This is the case in particular if the hollow profile has a round, for example a circular or an elliptical cross-sectional area.

Gemäß einer nächsten bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens wird das Hohlprofil entlang des gesamten Kantenstoßes gestaucht. Hierdurch wird erreicht, dass die Rückfederung des Hohlprofils über die gesamte Axiallänge des Kantenstoßes reduziert wird und insofern ein hochmaßhaltiger Kantenstoß bereitgestellt werden kann.According to a next preferred embodiment of the method according to the invention, the hollow profile is compressed along the entire edge impact. This ensures that the springback of the hollow profile over the entire axial length of the edge impact is reduced and thus a high-dimensional edge impact can be provided.

Weist das hergestellte Hohlprofil zumindest bereichsweise einen runden Querschnitt auf, so kann über das erfindungsgemäße Verfahren das Hohlprofil in diesen Bereichen über den gesamten Querschnitt gestaucht werden.If the hollow profile produced has a round cross-section at least in regions, the hollow profile in these regions can be compressed over the entire cross-section via the method according to the invention.

Gemäß einer weiteren bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens weist das hergestellte Hohlprofil zumindest bereichsweise einen kastenförmigen oder eckigen Querschnitt auf, so dass insbesondere mindestens die an den Kantenstoß anliegenden Flächen des Hohlprofils bei Verwendung des erfindungsgemäßen Verfahrens gestaucht werden können und ebenfalls ein hochmaßhaltiger Kantenstoß bereitgestellt werden kann.According to a further preferred embodiment of the method according to the invention, the hollow profile produced at least partially a box-shaped or polygonal cross-section, so that in particular at least the voltage applied to the edge impact surfaces of the hollow profile can be compressed using the method according to the invention and also a high-dimensional edge impact can be provided.

Das erfindungsgemäße Verfahren ist auf jede beliebige Querschnittsform anwendbar, wobei auch in Längsrichtung betrachtet beliebige Kombination, beispielsweise rund/elliptisch/kastenförmig möglich sind. Der Längenüberschuss kann, insbesondere in Verbindung mit der Werkzeuggestaltung, auch so dimensioniert werden, dass dieser sich in allen weiteren Flächen rückfederungsminimierend auswirkt.The method according to the invention can be applied to any desired cross-sectional shape, wherein any combination, for example round / elliptical / box-shaped, is also possible in the longitudinal direction. The excess length, in particular in connection with the tool design, can also be dimensioned such that it has a minimization of springback in all other surfaces.

Schließlich kann das Verfahren dadurch weiter ausgestaltet werden, dass der am Kantenstoß vorgesehene Schlitz des Hohlprofils nach der Umformung, insbesondere unter Verwendung eines Laserstrahls geschweißt wird. Aufgrund der hochmaßhaltigen Kantenstöße, welche mit dem erfindungsgemäßen Verfahren realisiert werden können, spielt es bei dem erfindungsgemäßen Herstellverfahren keine Rolle, ob das herzustellende, geschlossene Hohlprofil bereichsweise unterschiedliche Querschnittsflächen besitzt. Unabhängig nämlich davon wie auch die Querschnittsfläche selbst ausgebildet ist, erfolgt über das erfindungsgemäße Verfahren ein Stauchen der am Kantenstoß beteiligten Flächen des Hohlprofils und damit eine maßhaltige Ausbildung des Kantenstoßes.Finally, the method can be further developed in that the provided at the edge impact slot of the Hollow profile after forming, in particular using a laser beam is welded. Due to the high-dimensional edge joints, which can be realized with the method according to the invention, it does not matter in the production process according to the invention whether the closed hollow profile to be produced has regionally different cross-sectional areas. Regardless of how as well as the cross-sectional area itself is formed, a upsetting of the surfaces involved in the edge impact surfaces of the hollow profile and thus a dimensionally stable formation of edge impact occurs via the inventive method.

Im Weiteren soll die Erfindung anhand von Ausführungsbeispielen in Verbindung mit der Zeichnung näher erläutert werden. Die Zeichnung zeigt in

Fig. 1
in perspektivischer Darstellung eine schematische Ansicht eines Platinenzuschnitts zur Herstellung eines rohrförmigen Hohlprofils,
Fig. 2 bis Fig. 4
den Platinenzuschnitt aus Fig. 1 in den verschiedenen Umformstadien einer U-O-Umformung ebenfalls in perspektivischer Darstellung,
Fig. 5
in perspektivischer Darstellung ein Platinenzuschnitt zur Herstellung eines Hohlprofils unter Verwendung der Einrolltechnik (InnForm T3®) und
Fig. 6
in einer perspektivischen Darstellung der zu einem komplexen Hohlprofil umgeformte Platinenzuschnitt aus Fig. 5 vor dem finalen Umformschritt bei der Verwendung der Einrolltechnik.
In addition, the invention will be explained in more detail with reference to embodiments in conjunction with the drawings. The drawing shows in
Fig. 1
in a perspective view a schematic view of a board blank for producing a tubular hollow profile,
Fig. 2 to Fig. 4
the board cut out Fig. 1 in the different forming stages of a UO-forming also in perspective,
Fig. 5
a perspective view of a board blank for producing a hollow profile using the Einrolltechnik (InnForm T 3 ®) and
Fig. 6
in a perspective view of the transformed into a complex hollow profile board blank from Fig. 5 before the final forming step using the roll-in technique.

Zunächst ist in Fig. 1 in einer perspektivischen Darstellung ein Platinenzuschnitt 1 gezeigt, welcher an den Kantenbereichen 1a, 1b, die den späteren Kantenstoß des Hohlprofils bilden, einen Längenüberschuss aufweist. Mit der Länge A ist die notwendige Einformlänge, d.h. die Umfangslänge der Platine gekennzeichnet, welche für die Bereitstellung der Querschnittsfläche benötigt wird. In den Fig. 2, 3 und 4 werden nun die einzelnen Umformschritte einer U-O-Umformung des Platinenzuschnitts 1 in perspektivischer Darstellung gezeigt. Der Platinenzuschnitt 1 wird zunächst in eine U-Form geformt, Fig. 2. Dies erfolgt üblicherweise mit einer ersten Gesenkhälfte unter Verwendung eines Stempels, welcher den ebenen Platinenzuschnitt 1 in die U-Form umformt. Bei der weiteren Umformung des Platinenzuschnitts wird, wie in Fig. 3 gezeigt, die U-Form zunächst geschlossen, dies wird häufig unter Verwendung einer oberen Gesenkhälfte erreicht, so dass die Kantenbereiche 1a, 1b des Platinenzuschnitts 1 gegeneinander stoßen. Bei der Umformung des Platinenzuschnitts 1 in die Endform, wie dies in Fig. 4 gezeigt ist, stoßen die Kantenbereiche 1a, 1b aufeinander und führen zu einer Stauchung des Hohlprofils über den gesamten Querschnitt. Aufgrund der Stauchung wird die Rückfederung des Platinenzuschnitts stark reduziert, so dass ein besonders maßhaltiger Längsschlitz 2 des Hohlprofils zur Verfügung gestellt werden kann. Die Stauchung des Hohlprofils findet in Umfangsrichtung statt, wie die Pfeile in Fig. 4 andeuten. Der Längsschlitz 2 eignet sich besonders zur Durchführung eines Laserstrahlschweißens, da das Laserstrahlschweißen aufgrund der geringen Ausdehnung der Schweißzone besondere Anforderung an die Maßhaltigkeit des Schlitzes fordert. Wie Fig. 4 zu entnehmen ist, wird der zu einem längsgeschlitzten Hohlprofil umgeformte Platinenzuschnitt 1 über seine gesamte axiale Länge in Umfangsrichtung gestaucht. Allerdings ist auch denkbar, den Platinenzuschnitt 1 nur in den Bereichen zu stauchen, welche für die Bereitstellung eines zu schweißenden Längsschlitzes benötigt werden.First is in Fig. 1 in a perspective view a board blank 1 shown, which at the edge regions 1a, 1b, which form the later edge impact of the hollow profile, has a length excess. With the length A, the necessary Einformlänge, ie the circumferential length of the board is marked, which is needed for the provision of the cross-sectional area. In the Fig. 2, 3 and 4 Now, the individual forming steps of a UO deformation of the board blank 1 are shown in a perspective view. The board blank 1 is first formed into a U-shape, Fig. 2 , This is usually done with a first die half using a punch, which transforms the flat board blank 1 in the U-shape. As the board is further reshaped, as in FIG Fig. 3 shown, the U-shape initially closed, this is often achieved using an upper die half, so that the edge portions 1a, 1b of the board blank 1 abut against each other. When forming the board blank 1 in the final shape, as in Fig. 4 is shown, the edge portions 1a, 1b abut each other and lead to a compression of the hollow profile over the entire cross section. Due to the compression, the springback of the board blank is greatly reduced, so that a particularly dimensionally stable longitudinal slot 2 of the hollow profile can be made available. The compression of the hollow profile takes place in the circumferential direction, as the arrows in Fig. 4 suggest. Of the Longitudinal slot 2 is particularly suitable for carrying out a laser beam welding, since the laser beam welding requires due to the small extent of the weld zone special requirement for dimensional accuracy of the slot. As Fig. 4 can be seen, the formed into a longitudinally slotted hollow profile board blank 1 is compressed over its entire axial length in the circumferential direction. However, it is also conceivable to compress the board blank 1 only in the areas which are needed for the provision of a longitudinal slot to be welded.

Ein weiteres Ausführungsbeispiel eines Platinenzuschnitts 3 zeigt Fig. 5 in einer perspektivischen Darstellung. Der Platinenzuschnitt 3 ist für die Verwendung der Einrolltechnik vorgesehen. Bei der Einrolltechnik wird ein im Wesentlichen ebener Platinenzuschnitt unter Verwendung einer Mehrseitenpresse, Einzelpressen oder Pressenlinien vorzugsweise unter Verwendung eines Formkerns 4 zu einem Hohlprofil umgeformt. In Fig. 5 ist mit 3a, 3b die für die Bereitstellung des lokalen Querschnitts vorgesehene Umfangslänge gekennzeichnet. Die darüber hinaus stehenden Kantenbereiche des Platinenzuschnitts 3 werden erfindungsgemäß zur Stauchung des Platinenzuschnitts während der Umformung des Platinenzuschnitts 3 in die Endform verwendet.Another embodiment of a board blank 3 shows Fig. 5 in a perspective view. The board blank 3 is intended for the use of Einrolltechnik. In the curling technique, a substantially flat board blank is preferably formed into a hollow profile using a multi-side press, single presses or press lines using a mandrel 4. In Fig. 5 3a, 3b denotes the circumferential length provided for the provision of the local cross section. The beyond edge regions of the board blank 3 are used according to the invention for compression of the board blank during the forming of the board blank 3 in the final form.

Wie Fig. 5 noch zu entnehmen ist, kann der Längenüberschuss des Platinenzuschnitts 3 in Umfangsrichtung variabel abhängig von der herzustellenden Form des Hohlprofils variiert werden. Es hat sich gezeigt, dass eine Wahl des Längenüberschusses in Umfangslänge des Platinenzuschnitts von mindestens 1% bis 10% der notwendigen Umfangslänge bzw. der Einformlänge, vorzugsweise 2% bis 5% der notwendigen Einformlänge besonders gute Ergebnisse hinsichtlich der Bereitstellung hochmaßhaltiger, längsgeschlitzter Hohlprofile führt.As Fig. 5 can still be seen, the length excess of the board blank 3 can be varied in the circumferential direction variable depending on the shape of the hollow profile to be produced. It has been found that a choice of the length excess in the circumferential length of the blank blank of at least 1% to 10% of the necessary circumferential length or the Einformlänge, preferably 2% to 5% of the necessary Einformlänge particularly good results in terms of providing highly dimensionally, longitudinally slotted hollow profiles leads.

Schließlich ist in Fig. 6 der bereits zu einer Vorform umgeformte Platinenzuschnitt 3 dargestellt, welcher unter Verwendung eines Formkerns 4, einer unteren Gesenkhälfte 5 und einer oberen Gesenkhälfte 6 zur Endform umgeformt wird. Der über die axiale Länge vorgesehene Längenüberschuss des Platinenzuschnitts in Umfangsrichtung wird dazu verwendet, dass herzustellende Hohlprofil vor der Umformung in die Endform zu Stauchen, so dass die Rückfederung bei der Umformung des Platinenzuschnitts zu einem geschlitzten Hohlprofil deutlich verringert wird.Finally, in Fig. 6 the board cut already formed into a preform 3, which is formed using a mandrel 4, a lower die half 5 and an upper die half 6 to the final shape. The over the axial length provided length excess of Blankenzuschnitts in the circumferential direction is used to compress the hollow profile to be produced before forming in the final shape, so that the springback is significantly reduced during the deformation of the board blank to a slotted hollow profile.

Claims (7)

  1. Method for producing slit hollow profiles from a cut blank (1, 3), in which the hollow profile is produced from the essentially flat blank (1, 3) using rolling-up technology or using U-O-forming, so that the hollow profile has a slit (2) running in the axial direction along the abutting edges of the formed blank, wherein the cut blank (1, 3) provides a circumferential length in the locally provided cross-sectional areas which is greater than the required forming length, so that when the cut blank (1, 3) is formed into a closed hollow profile the opposite edges (1a, 1b, 3a, 3b) of the formed cut blank abut on one another and when it is formed into the final shape at least the areas of the hollow profile abutting on the edge joint are at least partly compressed in the circumferential direction, characterised in that the excess length of the circumferential length of the cut blank (1, 3) is distributed symmetrically over both edge areas.
  2. Method according to Claim 1, characterised in that the excess length of the circumferential length of the cut blank (1, 3) in the locally provided cross-sectional areas is at least 1 % to 10 %, preferably 2 % to 5 % of the required forming length.
  3. Method according to Claim 1 or 2, characterised in that the hollow profile is compressed over its entire cross-section.
  4. Method according to any one of Claims 1 to 3, characterised in that the hollow profile is compressed along the entire edge joint.
  5. Method according to any one of Claims 1 to 4, characterised in that the produced hollow profile at least in certain areas has a round cross-section.
  6. Method according to any one of Claims 1 to 5, characterised in that the produced hollow profile at least in certain areas has a box-shaped or cornered cross-section and the increased circumferential length is provided at least in the areas which abut on the edge joint.
  7. Method according to any one of Claims 1 to 6, characterised in that the slit of the hollow profile provided on the edge joint is welded after the forming, in particular is welded using a laser beam.
EP12726804.3A 2011-06-17 2012-06-11 Method for producing slit hollow profiles Active EP2720813B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011051160A DE102011051160A1 (en) 2011-06-17 2011-06-17 Method for producing slotted hollow profiles
PCT/EP2012/061002 WO2012171875A1 (en) 2011-06-17 2012-06-11 Method for producing slit hollow profiles

Publications (3)

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EP2720813A1 EP2720813A1 (en) 2014-04-23
EP2720813B1 true EP2720813B1 (en) 2014-10-01
EP2720813B2 EP2720813B2 (en) 2018-06-27

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US (1) US8833128B2 (en)
EP (1) EP2720813B2 (en)
JP (1) JP5706042B2 (en)
KR (1) KR101974963B1 (en)
CN (1) CN103608132B (en)
DE (1) DE102011051160A1 (en)
ES (1) ES2526888T5 (en)
WO (1) WO2012171875A1 (en)

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CN111872632B (en) * 2020-06-12 2023-06-20 中国二冶集团有限公司 Manufacturing method of open pipeline

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Publication number Publication date
ES2526888T5 (en) 2018-10-22
JP5706042B2 (en) 2015-04-22
KR101974963B1 (en) 2019-05-03
EP2720813A1 (en) 2014-04-23
US20140096579A1 (en) 2014-04-10
CN103608132B (en) 2016-05-25
JP2014516801A (en) 2014-07-17
CN103608132A (en) 2014-02-26
US8833128B2 (en) 2014-09-16
DE102011051160A1 (en) 2012-12-20
KR20140034913A (en) 2014-03-20
WO2012171875A1 (en) 2012-12-20
ES2526888T3 (en) 2015-01-16
EP2720813B2 (en) 2018-06-27

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