EP0788848B1 - Method of manufacturing a tube with variable cross-section - Google Patents

Method of manufacturing a tube with variable cross-section Download PDF

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Publication number
EP0788848B1
EP0788848B1 EP97101610A EP97101610A EP0788848B1 EP 0788848 B1 EP0788848 B1 EP 0788848B1 EP 97101610 A EP97101610 A EP 97101610A EP 97101610 A EP97101610 A EP 97101610A EP 0788848 B1 EP0788848 B1 EP 0788848B1
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EP
European Patent Office
Prior art keywords
tube
section
blank
board
forming section
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
Application number
EP97101610A
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German (de)
French (fr)
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EP0788848A1 (en
Inventor
Wolfgang Streubel
Udo Klasfauseweh
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Benteler Deustchland GmbH
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Benteler Deustchland GmbH
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Publication of EP0788848A1 publication Critical patent/EP0788848A1/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 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
    • B21C37/065—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
    • B21C37/0803—Making tubes with welded or soldered seams the tubes having a special shape, e.g. polygonal tubes

Definitions

  • the invention relates to a method for manufacturing a pipe with sections of different cross-sectional configurations, such as. known from JP-A-3 291 115 is.
  • Welded pipes are made from steel strip or blanks Pipes shaped and then welded along their joints. This creates hollow bodies with a round cross-section.
  • Pipes are often used with cross-sectional enlargements at the ends needed. These widenings will made by mechanical expansion by the Pipe end with the help of a mandrel due to tensile and / or compressive forces is expanded.
  • the cross-sectional extensions that can be achieved however, are due to the ability to change shape limited of the material used. Accordingly, only comparatively small changes in geometry can be made. Also occurs frequently by expanding the material structure in the expansion area. In many cases this is undesirable because the hardening of the shape-changing capacity of the material. To eliminate the structural change is then a complex annealing treatment necessary for one for subsequent processing steps sufficient ductility of the widened pipe ends ensure.
  • the invention is based on the prior art Task based on a method for producing a Pipe with sections of different cross-sectional configurations to make it easier and more economical, whereby especially the possibilities in the design of the Pipe configuration can be improved.
  • a board provided which over a rectangular base area has at least one forming section is integrated in one piece.
  • the board is the true length Development of the outer peripheral surface of the manufactured Tube including any over the circumference of the pipe as tabs or similar protruding surfaces.
  • the board becomes a hollow cylindrical one Body shaped.
  • This is a tubular one Reshaping of the base area and a spiral reshaping of the forming section.
  • the longitudinal edges of the base area then lie exactly against each other while the board is partially wound in the forming section overlapping areas.
  • This forming process can be economical and high Accuracy can be made in a die, with first the board in a first step to one Semicircular profile and in a further step in the hollow cylindrical shape is brought.
  • the final shape can be an expansion of the Forming section act with an attacking from the inside Active medium, for example a mandrel. Should be one of the scope protruding tab of the tube needs to be formed the forming section only in the corresponding position be judged.
  • the joints are connected in the subsequent joining process. This is usually done by welding. For this there are different methods available, like that Laser, shielding gas, inductive or resistance welding.
  • a tube is obtained with the method according to the invention with sections of different cross-sectional configurations, with harmful deformations or weakening of the Pipe material avoided in the area of a cross-sectional change will occur or only to a reasonable extent.
  • the inventive method is particularly good for Production of a tube with a truncated cone Cross-sectional expansion suitable at at least one end, as provided for in claim 3.
  • a board with a rectangular one Base area to which a forming section is attached at one end trapezoidal configuration. Along the longitudinal plane of the board is symmetrical. The board is the development of the lateral surface of the one to be manufactured Rohrs.
  • tubes can be manufactured at to the trumpet-like area further cylindrical or frustoconical sections connect.
  • a sliding area can be formed, for example be that at the front end of the board a short trapezoidal approach is provided as an auxiliary surface. This auxiliary surface ensures that due to the initial punctiform touch a problem-free rolling up of the Board is possible.
  • Another advantageous measure is according to claim 6 in that the plate before the forming by a targeted Rolling deformation with areas in the rolling direction changing board thickness is provided. If necessary the rolled blank is trimmed as required, before being sent for further processing becomes.
  • the use-specifically shaped board shows deliberately varying board thicknesses to match accordingly the later use of the one made from the board Rohrs diverse areas to exactly those wall thicknesses convey that to the respective loads and thus also the voltage peaks which differ from one another locally are matched to these areas in practice Subject to use.
  • a pipe can be made with sections different cross-sectional configuration and Sections of different wall thickness.
  • the area by area Reduced wall thickness pipe is particularly suitable for the production of components that are under external stress stand, but with the occurring tensions due to the component design spread over the Component are at different heights. This is especially in the case of components of motor vehicles the case. Such components become after the maximum load designed, this inevitably leads to oversizing in less stressed areas. Out of this this not only results in a higher use of materials, but also unnecessary weight.
  • the rolling direction of the particular configuration be adapted to the later pipe.
  • You can the output boards twice or possibly several times in partially rolled in different directions.
  • the respective thickness according to the requirements can also be varied step by step.
  • rolling in a two-roll stand can be varied.
  • the roll geometry in the roll inlet can change the symmetry with respect to the central transverse plane within certain limits to be influenced.
  • the circuit board 1 shows a section of a circuit board 1, those for the manufacture of an end-widened tube serves.
  • the circuit board 1 has a rectangular base area 2, to which a trapezoidal Forming section 3 connects.
  • the board 1 is yours Center longitudinal axis MLA is symmetrical and provides the true-to-length processing of the pipe to be manufactured represents.
  • the circuit board 1 becomes a hollow cylindrical one Body shaped.
  • the forming section 3 is rolled up spirally, as shown in Figure 2 is. Here there is an overlap of the forming section 3 in areas 4 and 5.
  • the base region 2 is tubular is reshaped.
  • the longitudinal edges 6 and 7 of the base area 2 then face each other.
  • the hollow cylindrical body is in a suitable die and the forming section 3 flared, being in the final frustoconical Geometry is transferred.
  • the longitudinal edges 8 and 9 of the forming section 3 and of the longitudinal edges 6, 7 of the base region 2 is reached.
  • FIG. 4 shows the end section of a tube 10 with a cylindrical central portion 11 to which a frustoconical length section 12 and a cylindrical length section 13 connects.
  • the tube 10 is formed symmetrically to the central longitudinal axis MLA.
  • the circuit board 14 is shown in dashed lines, which is used to manufacture the tube 10.
  • the circuit board 14 is the development of the lateral surface of the tube 10.
  • By the adapted board cut becomes an exact system the joints 17, 17 ', 18, 18', 19, 19 'on the end-formed tube 10 reached.
  • FIG. 5 shows a circuit board 20 with a rectangular base area 21 and a trapezoidal shape trained forming section 22 and another rectangular forming section 23.
  • a ramp-like sliding area 26 trained.
  • the Aufgleit Scheme 26 is by a short trapezoidal approach 27 is formed.
  • the approach 27 acts as an auxiliary surface and ensures that due to the point-like contact at the beginning of the reeling process the board 20 can be done without problems.
  • a pipe 40 is shown in FIGS a holder 42 protruding from the circumference 41.
  • the holder 42 is arranged in the central region 43 of the tube 40.
  • a board is again used in the manufacture with a rectangular base area that the Holder 42 is attached as a forming section 44.
  • the circuit board is then rolled up so that the position shown in FIG situation shown.
  • the forming section 44 is in some areas on the outer surface 45 of the tube 40 on.
  • the forming section 44 in appropriately brought into the desired position, so that the holder 42 results.
  • FIG. 12 shows a section of a blank 48, in which regions 49 to 52 have been stretched by a specific rolling deformation, with blank thicknesses s 1 to s 4 changing in the rolling direction WR.
  • the areas 49-52 merge seamlessly into one another.
  • the circuit board 48 has an approximately smooth surface 57 on the underside 56. Of course, the board 48 can also be stretched on both sides.
  • Areas 50-52 are part of a rectangular base area 58 of the circuit board 48.
  • the area 49 has a trapezoidal shape Configuration and forms the forming section 59, which is integrally attached to the base region 58.
  • a tube can be produced from the board 48 with sections of different cross-sectional configuration and sections of different wall thicknesses s 1 to s 4 .
  • the regions 49-52 have exactly those circuit board thicknesses s 1 to s 4 which are matched to the respective loads and tensions to which the regions 49-52 are subject in the practical use of the tube produced from the circuit board 48 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Branch Pipes, Bends, And The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung eines Rohrs mit Abschnitten unterschiedlicher Querschnittskonfiguration, wie z.B. aus der JP-A-3 291 115 bekannt ist.The invention relates to a method for manufacturing a pipe with sections of different cross-sectional configurations, such as. known from JP-A-3 291 115 is.

Geschweißte Rohre werden aus Bandstahl oder Platinen zu Rohren geformt und anschließend entlang ihrer Stöße geschweißt. Dabei entstehen Hohlkörper mit rundem Querschnitt.Welded pipes are made from steel strip or blanks Pipes shaped and then welded along their joints. This creates hollow bodies with a round cross-section.

Häufig werden Rohre mit an den Enden vorliegenden Querschnittserweiterungen benötigt. Diese Aufweitungen werden durch mechanisches Aufweiten hergestellt, indem das Rohrende mit Hilfe eines Dorns durch Zug- und/oder Druckkräfte aufgeweitet wird. Die dabei erzielbaren Querschnittserweiterungen sind jedoch durch das Formänderungsvermögen des verwendeten Werkstoffs begrenzt. Dementsprechend können nur vergleichsweise geringe Geometrieänderungen vorgenommen werden. Auch tritt häufig durch das Aufweiten eine Verfestigung des Werkstoffgefüges im Aufweitungsbereich ein. Dies ist in vielen Fällen unerwünscht, da die Verfestigung das Formänderungsvermögen des Werkstoffs herabsetzt. Zur Beseitigung der Gefügeveränderung ist dann eine aufwendige Glühbehandlung notwendig, um eine für nachfolgende Bearbeitungsschritte hinreichende Duktilität der aufgeweiteten Rohrenden sicherzustellen.Pipes are often used with cross-sectional enlargements at the ends needed. These widenings will made by mechanical expansion by the Pipe end with the help of a mandrel due to tensile and / or compressive forces is expanded. The cross-sectional extensions that can be achieved however, are due to the ability to change shape limited of the material used. Accordingly, only comparatively small changes in geometry can be made. Also occurs frequently by expanding the material structure in the expansion area. In many cases this is undesirable because the hardening of the shape-changing capacity of the material. To eliminate the structural change is then a complex annealing treatment necessary for one for subsequent processing steps sufficient ductility of the widened pipe ends ensure.

Mehraufwand ist auch erforderlich, wenn die Rohre mit Haltern, Laschen oder ähnlichem ausgerüstet sein müssen. Derartige Anbauteile werden üblicherweise nach der Rohrfertigung schweißtechnisch am Rohr festgelegt. Damit ist nicht nur fertigungstechnischer Mehraufwand verbunden, sondern es kann auch infolge der Schweißung zu nachträglichen Gefügeveränderungen des Werkstoffs im Schweißbereich kommen.Additional effort is also required if the pipes are used Holders, tabs or similar must be equipped. Such attachments are usually made after pipe manufacturing welded to the pipe. So that is not only linked to additional manufacturing costs, but it can also result from welding afterwards Structural changes in the material in the welding area come.

Der Erfindung liegt ausgehend vom Stand der Technik die Aufgabe zugrunde, ein Verfahren zur Herstellung eines Rohrs mit Abschnitten unterschiedlicher Querschnittskonfiguration einfacher und ökonomischer zu gestalten, wobei insbesondere auch die Möglichkeiten in der Gestaltung der Rohrkonfiguration verbessert werden.The invention is based on the prior art Task based on a method for producing a Pipe with sections of different cross-sectional configurations to make it easier and more economical, whereby especially the possibilities in the design of the Pipe configuration can be improved.

Diese Aufgabe wird erfindungsgemäß durch das im Anspruch 1 augegebenen Verfahren gelöst.This object is achieved by the claim 1 given procedure solved.

Zur Herstellung eines Rohrs mit Abschnitten unterschiedlicher Querschnittskonfiguration wird zunächst eine Platine bereitgestellt, welche über einen rechteckigen Basisbereich verfügt, an den mindestens ein Umformabschnitt einstückig angegliedert ist. Die Platine ist die längengetreue Abwicklung der äußeren Umfangsfläche des herzustellenden Rohrs einschließlich etwaiger über den Umfang des Rohrs als Laschen oder ähnlichem abstehender Flächen.To make a pipe with different sections Cross-sectional configuration is first a board provided which over a rectangular base area has at least one forming section is integrated in one piece. The board is the true length Development of the outer peripheral surface of the manufactured Tube including any over the circumference of the pipe as tabs or similar protruding surfaces.

Im nächsten Schritt wird die Platine zu einem hohlzylindrischen Körper geformt. Dabei erfolgt eine rohrförmige Umformung des Basisbereichs und eine spiralförmige Umformung des Umformabschnitts. Die Längskanten des Basisbereichs liegen dann exakt aneinander an, während die Platine im Umformabschnitt aufgewickelt ist mit teilweise überlappenden Bereichen.In the next step, the board becomes a hollow cylindrical one Body shaped. This is a tubular one Reshaping of the base area and a spiral reshaping of the forming section. The longitudinal edges of the base area then lie exactly against each other while the board is partially wound in the forming section overlapping areas.

Dieser Umformvorgang kann wirtschaftlich und mit hoher Genauigkeit in einem Gesenk vorgenommen werden, wobei zunächst die Platine in einem ersten Teilschritt zu einem Halbkreisprofil und in einem weiteren Teilschritt in die hohlzylindrische Form gebracht wird.This forming process can be economical and high Accuracy can be made in a die, with first the board in a first step to one Semicircular profile and in a further step in the hollow cylindrical shape is brought.

Hieran schließt sich die Endformgebung des Rohrs an, bei der mittels geeigneter Wirkmedien auf den Umformabschnitt eingewirkt wird und so die endgültige Geometrie des Rohrs erreicht wird.This is followed by the final shape of the tube, at that by means of suitable active media on the forming section is influenced and so the final geometry of the tube is achieved.

Bei der Endformgebung kann es sich um ein Aufweiten des Umformabschnitts handeln mit einem von innen angreifenden Wirkmedium, beispielsweise einem Dorn. Soll eine vom Umfang des Rohrs abstehende Lasche geformt werden, braucht der Umformabschnitt lediglich in die entsprechende Stellung gerichtet werden.The final shape can be an expansion of the Forming section act with an attacking from the inside Active medium, for example a mandrel. Should be one of the scope protruding tab of the tube needs to be formed the forming section only in the corresponding position be judged.

Im nachfolgenden Fügeprozeß werden die Stöße verbunden. Dies geschieht üblicherweise durch Verschweißen. Hierzu stehen unterschiedliche Verfahren zur Verfügung, wie das Laser-, Schutzgas-, Induktiv- oder Widerstandsschweißen. The joints are connected in the subsequent joining process. This is usually done by welding. For this there are different methods available, like that Laser, shielding gas, inductive or resistance welding.

Mit dem erfindungsgemäßen Verfahren erhält man ein Rohr mit Abschnitten unterschiedlicher Querschnittskonfiguration, wobei schädliche Verformungen oder Schwächungen des Rohrwerkstoffs im Bereich einer Querschnittsänderung vermieden werden bzw. nur in einem vertretbaren Umfang auftreten.A tube is obtained with the method according to the invention with sections of different cross-sectional configurations, with harmful deformations or weakening of the Pipe material avoided in the area of a cross-sectional change will occur or only to a reasonable extent.

Nach den Merkmalen des Anspruchs 2 ist es auch möglich, zunächst die im Basisbereich liegenden Stoßkanten ganz oder teilweise zu fügen, bevor die Endformung vorgenommen wird. Dies kann bei einer komplizierteren geometrischen Konfiguration eines Rohrs zu einer Erleichterung der weiteren Fertigungsschritte führen.According to the features of claim 2, it is also possible First the butt edges lying in the base area completely or to add partially before the final shaping is made becomes. This can be a more complicated geometric Configuration of a pipe to facilitate the further Lead manufacturing steps.

Das erfindungsgemäße Verfahren ist besonders gut für die Herstellung eines Rohrs mit einer kegelstumpfförmigen Querschnittserweiterung an mindestens einem Ende geeignet, wie dies Anspruch 3 vorsieht.The inventive method is particularly good for Production of a tube with a truncated cone Cross-sectional expansion suitable at at least one end, as provided for in claim 3.

Danach wird eine Platine verwendet mit einem rechteckigen Basisbereich, an den sich an einem Ende ein Umformabschnitt trapezförmiger Konfiguration anschließt. Entlang ihrer Längsebene ist die Platine symmetrisch ausgebildet. Die Platine ist die Abwicklung der Mantelfläche des herzustellenden Rohrs.Then a board with a rectangular one is used Base area to which a forming section is attached at one end trapezoidal configuration. Along the longitudinal plane of the board is symmetrical. The board is the development of the lateral surface of the one to be manufactured Rohrs.

Nachdem die Platine zu einem rohrförmigen Hohlkörper umgeformt ist, wird die Endformgebung des Rohrs vorgenommen, indem der spiralartig aufgewickelte Umformabschnitt trompetenartig aufgeweitet wird. Zweckmäßig geschieht dies in einer geeigneten Matrize durch Aufdornen des Endbereichs, so daß sich dieser vollständig abwickelt und die endgültige Geometrie des abgesetzten Rohrs erreicht wird. Hieran schließt sich dann das Verschweißen der Stoßkanten an. After the board is formed into a tubular hollow body is the final shaping of the pipe, by the spirally wound forming section is expanded like a trumpet. Happily happens this in a suitable die by thinning the end area, so that it unwinds completely and reached the final geometry of the stepped pipe becomes. This is followed by the welding of the Abutting edges.

Mit dieser Vorgehensweise können nahezu beliebige Querschnittserweiterungen in den Endbereichen eines Rohrs erreicht werden. Das Formänderungsvermögen des verwendeten Werkstoffs begrenzt die Formgebung der Rohre erheblich weniger als bisher. Verfestigungen des Werkstoffs im Bereich der Aufweitungen werden minimiert. Demzufolge kann auch in der Regel auf eine thermische Nachbehandlung zur Egalisierung nachteiliger Werkstoffveränderungen verzichtet werden.With this procedure, almost any cross-sectional extensions can be made reached in the end areas of a pipe become. The deformability of the used Material significantly limits the shape of the pipes less than before. Solidification of the material in the area the widening is minimized. As a result also usually for thermal aftertreatment No equalization of disadvantageous material changes become.

Eine vorteilhafte Weiterbildung des erfindungsgemäßen Verfahrens ist im Anspruch 4 zu sehen. Durch die Verwendung einer Platine, bei der sich an den trapezförmigen Umformabschnitt weitere trapezförmige und/oder rechteckige Umformabschnitte anschließen, ist eine breite Geometrievariation der Endbereiche eines Rohrs möglich.An advantageous development of the invention The method can be seen in claim 4. By using it a circuit board with the trapezoidal shape Forming section further trapezoidal and / or rectangular Connecting forming sections is a wide variation in geometry the end areas of a pipe possible.

Auf diese Weise können Rohre hergestellt werden, bei denen sich an den trompetenartig aufgeweiteten Bereich weitere zylindrische oder kegelstumpfförmige Abschnitte anschließen.In this way, tubes can be manufactured at to the trumpet-like area further cylindrical or frustoconical sections connect.

Um zu vermeiden, daß die Stoßkanten des Umformabschnitts beim Aufrollvorgang direkt aneinanderstoßen, kann dem Umformabschnitt ein rampenartiger Aufgleitbereich zugeordnet werden. Dieser ist insbesondere dann von Vorteil, wenn mehrere Umformabschnitte unterschiedlicher Geometrie aneinandergegliedert sind.To avoid the abutting edges of the forming section abutting directly during the rolling process can cause the forming section assigned a ramp-like sliding area become. This is particularly advantageous if if several forming sections of different geometry are grouped together.

Ein Aufgleitbereich kann beispielsweise dadurch gebildet werden, daß am stirnseitigen Ende der Platine ein kurzer trapezförmiger Ansatz als Hilfsfläche vorgesehen wird. Diese Hilfsfläche sorgt dafür, daß aufgrund der anfangs punktförmigen Berührung ein problemloses Aufrollen der Platine möglich ist. A sliding area can be formed, for example be that at the front end of the board a short trapezoidal approach is provided as an auxiliary surface. This auxiliary surface ensures that due to the initial punctiform touch a problem-free rolling up of the Board is possible.

Möglich ist es aber auch, den Aufgleitbereich durch eine Umstellung an einer Stoßkante eines Umformabschnitts auszubilden.However, it is also possible to use a sliding area Form conversion on a butt edge of a forming section.

Eine weitere vorteilhafte Maßnahme besteht nach Anspruch 6 darin, daß die Platine vor der Umformung durch eine gezielte walzende Verformung mit in Walzrichtung bereichsweise wechselnden Platinendicken versehen wird. Falls erforderlich, wird die gewalzte Platine bedarfsgerecht beschnitten, bevor sie der Weiterverarbeitung zugeführt wird. Die verwendungsspezifisch geformte Platine weist bewußt variierende Platinendicken auf, um entsprechend der späteren Verwendung des aus der Platine gefertigten Rohrs diversen Bereichen genau diejenigen Wanddicken zu vermitteln, die auf die jeweiligen Belastungen und damit auch die örtlich voneinander abweichenden Spannungsspitzen abgestimmt sind, denen diese Bereiche im praktischen Einsatz unterliegen.Another advantageous measure is according to claim 6 in that the plate before the forming by a targeted Rolling deformation with areas in the rolling direction changing board thickness is provided. If necessary the rolled blank is trimmed as required, before being sent for further processing becomes. The use-specifically shaped board shows deliberately varying board thicknesses to match accordingly the later use of the one made from the board Rohrs diverse areas to exactly those wall thicknesses convey that to the respective loads and thus also the voltage peaks which differ from one another locally are matched to these areas in practice Subject to use.

Auf diese Weise kann ein Rohr hergestellt werden mit Abschnitten unterschiedlicher Querschnittskonfiguration und Abschnitten unterschiedlicher Wanddicke. Das bereichsweise wanddickenreduzierte Rohr ist besonders geeignet für die Herstellung von Bauteilen, die unter äußerer Belastung stehen, bei denen aber die auftretenden Spannungen aufgrund der Bauteilkonstruktion verteilt über das Bauteil in unterschiedlicher Höhe vorliegen. Dies ist insbesondere bei Komponenten von Kraftfahrzeugen häufig der Fall. Werden derartige Bauteile nach der Maximalbelastung ausgelegt, führt dies zwangsläufig zu einer Überdimensionierung in weniger belasteten Bereichen. Hieraus resultiert dann nicht nur ein höherer Materialeinsatz, sondern auch unnötiges Gewicht. Diese Nachteile werden nunmehr dadurch vermieden, daß die Rohre, die zur Herstellung der Bauteile dienen, entsprechend der späteren Belastung in einzelnen Bereichen der Bauteile unterschiedlich dimensioniert werden.In this way, a pipe can be made with sections different cross-sectional configuration and Sections of different wall thickness. The area by area Reduced wall thickness pipe is particularly suitable for the production of components that are under external stress stand, but with the occurring tensions due to the component design spread over the Component are at different heights. This is especially in the case of components of motor vehicles the case. Such components become after the maximum load designed, this inevitably leads to oversizing in less stressed areas. Out of this this not only results in a higher use of materials, but also unnecessary weight. These drawbacks will be now avoided by the fact that the pipes used for the production the components serve, according to the later Different loads in individual areas of the components be dimensioned.

Grundsätzlich kann die Walzrichtung der jeweiligen Konfiguration des späteren Rohrs angepaßt werden. Dabei können die Ausgangsplatinen auch zweimal oder ggf. mehrfach in verschiedenen Richtungen partiell gewalzt werden. Dadurch kann die jeweilige Dicke entsprechend den Erfordernissen beliebig auch stufenweise variiert werden. Zweckmäßig erfolgt das Walzen in einem Zweiwalzengerüst. Durch Variation der Walzengeometrie im Walzeneinlauf kann die Symmetrie bezüglich der Mittelquerebene in gewissen Grenzen beeinflußt werden.Basically, the rolling direction of the particular configuration be adapted to the later pipe. You can the output boards twice or possibly several times in partially rolled in different directions. Thereby can the respective thickness according to the requirements can also be varied step by step. Conveniently done rolling in a two-roll stand. By variation The roll geometry in the roll inlet can change the symmetry with respect to the central transverse plane within certain limits to be influenced.

Die Erfindung ist nachfolgend anhand von in den Zeichnungen dargestellten Ausführungsbeispielen näher beschrieben. Es zeigen:

Figur 1
in der Draufsicht den Ausschnitt einer Platine für ein endseitig erweitertes Rohr;
Figur 2
einen vertikalen Querschnitt durch einen spiralförmig gerollten Umformabschnitt;
Figur 3
einen vertikalen Querschnitt durch den rohrförmig gerollten Mittelabschnitt;
Figur 4
in der Draufsicht den Endabschnitt eines Rohrs mit einem kegelstumpfförmigen Längenabschnitt, an den sich ein zylinderförmiger Längenabschnitt anschließt, sowie die Abwicklung des Endabschnitts;
Figur 5
eine weitere Ausführungsform einer Platine;
Figur 6
einen vertikalen Querschnitt durch einen Umformabschnitt mit einer Umstellung;
Figur 7
den Endabschnitt eines mehrfach abgesetzten Rohrs;
Figur 8
eine weitere Ausführungsform eines Rohrs in der Draufsicht;
Figur 9
das Rohr gemäß Figur 8 in perspektivischer Darstellung;
Figur 10
einen vertikalen Querschnitt durch das Rohr der Figur 8 vor der Endformgebung;
Figur 11
den vertikalen Querschnitt durch das Rohr gemäß der Figur 8 nach der Endformgebung und
Figur 12
in perspektivischer Darstellungsweise einen Ausschnitt aus einer Platine mit bereichsweise unterschiedlichen Platinendicken.
The invention is described below with reference to embodiments shown in the drawings. Show it:
Figure 1
in the top view the section of a circuit board for a tube expanded at the end;
Figure 2
a vertical cross section through a spirally rolled forming section;
Figure 3
a vertical cross section through the tubular rolled middle section;
Figure 4
in plan view the end section of a tube with a frustoconical length section, which is followed by a cylindrical length section, and the development of the end section;
Figure 5
another embodiment of a circuit board;
Figure 6
a vertical cross section through a forming section with a change;
Figure 7
the end section of a multi-step pipe;
Figure 8
a further embodiment of a tube in plan view;
Figure 9
the tube of Figure 8 in perspective;
Figure 10
a vertical cross section through the tube of Figure 8 before final shaping;
Figure 11
the vertical cross section through the tube according to Figure 8 after the final shaping and
Figure 12
a perspective view of a section of a board with different board thicknesses in some areas.

Die Figur 1 zeigt einen Ausschnitt aus einer Platine 1, die zur Herstellung eines endseitig erweiterten Rohrs dient. Die Platine 1 verfügt über einen rechteckigen Basisbereich 2, an den sich ein trapezförmig ausgebildeter Umformabschnitt 3 anschließt. Die Platine 1 ist zu ihrer Mittellängsachse MLA symmetrisch ausgebildet und stellt die längengetreue Abwicklung des herzustellenden Rohrs dar.1 shows a section of a circuit board 1, those for the manufacture of an end-widened tube serves. The circuit board 1 has a rectangular base area 2, to which a trapezoidal Forming section 3 connects. The board 1 is yours Center longitudinal axis MLA is symmetrical and provides the true-to-length processing of the pipe to be manufactured represents.

Umformtechnisch wird die Platine 1 zu einem hohlzylindrischen Körper geformt. Der Umformabschnitt 3 wird dabei spiralförmig aufgerollt, wie dies in Figur 2 dargestellt ist. Hier kommt es zu einer Überlappung des Umformabschnitts 3 in den Bereichen 4 und 5. In terms of forming technology, the circuit board 1 becomes a hollow cylindrical one Body shaped. The forming section 3 is rolled up spirally, as shown in Figure 2 is. Here there is an overlap of the forming section 3 in areas 4 and 5.

Aus der Figur 3 geht hervor, daß der Basisbereich 2 rohrförmig umgeformt ist. Die Längskanten 6 und 7 des Basisbereichs 2 liegen sich dann gegenüber.It can be seen from FIG. 3 that the base region 2 is tubular is reshaped. The longitudinal edges 6 and 7 of the base area 2 then face each other.

Bei der Endformgebung wird der hohlzylindrische Körper in einer geeigneten Matrize fixiert und der Umformabschnitt 3 aufgedornt, wobei er in die endgültige kegelstumpfförmige Geometrie überführt wird. Durch den präzise auf die Rohrform angepaßten Platinenschnitt wird eine exakte Anlage der Längskanten 8 und 9 des Umformabschnitts 3 sowie der Längskanten 6, 7 des Basisbereichs 2 erreicht.In the final shaping, the hollow cylindrical body is in a suitable die and the forming section 3 flared, being in the final frustoconical Geometry is transferred. Through the precise on the Pipe-shaped board cut becomes an exact system the longitudinal edges 8 and 9 of the forming section 3 and of the longitudinal edges 6, 7 of the base region 2 is reached.

In einem nachfolgenden Verfahrensschritt wird das Rohr durch Verschweißen der Längskanten 6, 7 bzw. 8, 9 fertiggestellt.In a subsequent process step, the pipe completed by welding the longitudinal edges 6, 7 or 8, 9.

In der Figur 4 ist der Endabschnitt eines Rohrs 10 dargestellt mit einem zylindrischen Mittelabschnitt 11, an den sich ein kegelstumpfförmiger Längenabschnitt 12 und ein zylinderförmiger Längenabschnitt 13 anschließt.FIG. 4 shows the end section of a tube 10 with a cylindrical central portion 11 to which a frustoconical length section 12 and a cylindrical length section 13 connects.

Zur Mittellängsachse MLA ist das Rohr 10 symmetrisch ausgebildet.The tube 10 is formed symmetrically to the central longitudinal axis MLA.

In gestrichelter Linienführung ist die Platine 14 dargestellt, die zur Herstellung des Rohrs 10 dient. Die Platine 14 ist die Abwicklung der Mantelfläche des Rohrs 10. Man erkennt den rechteckigen Basisbereich 11', an den sich ein trapezförmiger Umformabschnitt 15 und ein weiterer rechteckiger Umformabschnitt 16 anschließen. Durch den angepaßten Platinenschnitt wird eine exakte Anlage der Stöße 17, 17', 18, 18', 19, 19' am endgeformten Rohr 10 erreicht.The circuit board 14 is shown in dashed lines, which is used to manufacture the tube 10. The circuit board 14 is the development of the lateral surface of the tube 10. One recognizes the rectangular base area 11 'by the a trapezoidal forming section 15 and another Connect rectangular forming section 16. By the adapted board cut becomes an exact system the joints 17, 17 ', 18, 18', 19, 19 'on the end-formed tube 10 reached.

Aus der Figur 5 geht eine Platine 20 hervor mit einem rechteckigen Basisbereich 21 sowie einem trapezförmig ausgebildeten Umformabschnitt 22 und einem weiteren rechteckigen Umformabschnitt 23. Um zu vermeiden, daß die Stoßkanten 24, 25 des Umformabschnitts 23 beim Aufrollvorgang aneinanderstoßen, ist ein rampenartiger Aufgleitbereich 26 ausgebildet. Der Aufgleitbereich 26 wird durch einen kurzen trapezförmigen Ansatz 27 gebildet. Der Ansatz 27 fungiert als Hilfsfläche und sorgt dafür, daß aufgrund der anfangs punktförmigen Berührung der Aufrollvorgang der Platine 20 ohne Probleme erfolgen kann.5 shows a circuit board 20 with a rectangular base area 21 and a trapezoidal shape trained forming section 22 and another rectangular forming section 23. To avoid that Butt edges 24, 25 of the forming section 23 during the rolling process abutting is a ramp-like sliding area 26 trained. The Aufgleitbereich 26 is by a short trapezoidal approach 27 is formed. The approach 27 acts as an auxiliary surface and ensures that due to the point-like contact at the beginning of the reeling process the board 20 can be done without problems.

Eine andere Lösung zur Unterstützung des Aufrollvorgangs ist ist Figur 6 dargestellt. Hier wird ein Aufgleitbereich 28 durch eine Umstellung 29 an einer Stoßkante 30 eines Umformabschnitts 31 realisiert.Another solution to support the reeling process Figure 6 is shown. Here is a sliding area 28 by a changeover 29 on a butt edge 30 a forming section 31 realized.

Mit dem erfindungsgemäßen Verfahren können Rohre mit Abschnitten unterschiedlicher Querschnittskonfiguration auf einfache und ökonomische Weise hergestellt werden. Die Anzahl von Absätzen kann je nach Anwendungsfall variieren. Aus der Figur 7 geht ein solches Rohr 32 mit Mehrfachabsätzen hervor. An den zylindrischen Mittelabschnitt 33 schließt sich ein Absatz 34, bestehend aus einem kegelstumpfförmigen Übergangsabschnitt 35 und einem zylindrischen Längenabschnitt 36, an. Ein weiterer Absatz 37 wird von dem kegelstumpfförmigen Längenabschnitt 38 und dem zylinderförmigen Längenabschnitt 39 gebildet.With the method according to the invention, pipes with sections different cross-sectional configuration simple and economical way. The Number of paragraphs can vary depending on the application. Such a tube 32 with multiple shoulders is shown in FIG forth. At the cylindrical middle section 33 closes a paragraph 34 consisting of a truncated cone Transitional section 35 and a cylindrical Length section 36. Another paragraph 37 is of the frustoconical length section 38 and the cylindrical length section 39 is formed.

In den Figuren 8 bis 11 ist ein Rohr 40 dargestellt mit einem vom Umfang 41 abstehenden Halter 42. Der Halter 42 ist im Mittelbereich 43 vom Rohr 40 angeordnet.A pipe 40 is shown in FIGS a holder 42 protruding from the circumference 41. The holder 42 is arranged in the central region 43 of the tube 40.

Bei der Herstellung wird wiederum von einer Platine ausgegangen mit einem rechteckigen Basisbereich, dem der Halter 42 als Umformabschnitt 44 angegliedert ist. Die Platine wird dann aufgerollt, so daß sich die in Figur 10 dargestellte Situation ergibt. Der Umformabschnitt 44 liegt dabei bereichsweise an der Mantelfläche 45 vom Rohr 40 an. Zur Endformgebung wird der Umformabschnitt 44 in geeigneter Weise in die gewünschte Stellung gebracht, so daß sich der Halter 42 ergibt.A board is again used in the manufacture with a rectangular base area that the Holder 42 is attached as a forming section 44. The The circuit board is then rolled up so that the position shown in FIG situation shown. The forming section 44 is in some areas on the outer surface 45 of the tube 40 on. For the final shaping, the forming section 44 in appropriately brought into the desired position, so that the holder 42 results.

Im Anschluß daran erfolgt das Verschweißen der Längskanten 46 und 47.The longitudinal edges are then welded together 46 and 47.

Die Figur 12 zeigt einen Ausschnitt einer Platine 48, bei der durch eine gezielte walzende Verformung Bereiche 49 bis 52 abgestreckt worden sind mit in Walzrichtung WR wechselnden Platinendicken s1 bis s4. In den Übergängen 53, 54, 55 gehen die Bereiche 49-52 stufenlos ineinander über. In der hier gewählten Darstellungsweise weist die Platine 48 auf der Unterseite 56 eine annähernd glatte Oberfläche 57 auf. Selbstverständlich kann die Platine 48 auch beidseitig abgestreckt sein.FIG. 12 shows a section of a blank 48, in which regions 49 to 52 have been stretched by a specific rolling deformation, with blank thicknesses s 1 to s 4 changing in the rolling direction WR. In the transitions 53, 54, 55, the areas 49-52 merge seamlessly into one another. In the representation chosen here, the circuit board 48 has an approximately smooth surface 57 on the underside 56. Of course, the board 48 can also be stretched on both sides.

Die Bereiche 50-52 sind Teil eines rechteckigen Basisbereichs 58 der Platine 48. Der Bereich 49 hat eine trapezförmige Konfiguration und bildet den Umformabschnitt 59, der sich einstückig an den Basisbereich 58 angliedert.Areas 50-52 are part of a rectangular base area 58 of the circuit board 48. The area 49 has a trapezoidal shape Configuration and forms the forming section 59, which is integrally attached to the base region 58.

Aus der Platine 48 kann ein Rohr hergestellt werden mit Abschnitten unterschiedlicher Querschnittskonfiguration und Abschnitten unterschiedlicher Wanddicke s1 bis s4. Bei der verwendungsspezifisch verformten Platine 48 weisen die Bereiche 49-52 genau diejenigen Platinendicken s1 bis s4 auf, die auf die jeweiligen Belastungen und Spannungen abgestimmt sind, denen die Bereiche 49-52 in der praktischen Verwendung des aus der Platine 48 hergestellten Rohrs unterliegen. A tube can be produced from the board 48 with sections of different cross-sectional configuration and sections of different wall thicknesses s 1 to s 4 . In the case of the circuit board 48 which is deformed specifically for use, the regions 49-52 have exactly those circuit board thicknesses s 1 to s 4 which are matched to the respective loads and tensions to which the regions 49-52 are subject in the practical use of the tube produced from the circuit board 48 .

BezugszeichenaufstellungList of reference symbols

  • 1 - Platine1 - circuit board
  • 2 - Basisbereich v. 12 - base area v. 1
  • 3 - Umformabschnitt3 - forming section
  • 4 - Bereich v. 34 - area v. 3rd
  • 5 - Bereich v. 35 - area v. 3rd
  • 6 - Längskante v. 26 - longitudinal edge of 2nd
  • 7 - Längskante v. 27 - longitudinal edge of 2nd
  • 8 - Längskante v. 38 - longitudinal edge of 3rd
  • 9 - Längskante v. 39 - longitudinal edge of 3rd
  • 10 - Rohr10 - tube
  • 11 - Mittelabschnitt v. 10
       11' - Basisbereich    11 - middle section of 10th
    11 'base area
  • 12 - Längenabschnitt v. 1012 - section of v. 10th
  • 13 - Längenabschnitt v. 1013 - length section from 10th
  • 14 - Platine14 - circuit board
  • 15 - Umformabschnitt15 - forming section
  • 16 - Umformabschnitt16 - forming section
  • 17 - Stoß
       17' - Stoß    17 - shock
    17 'kick
  • 18 - Stoß
       18' - Stoß    18 - push
    18 'stroke
  • 19 - Stoß
       19' - Stoß    19 - shock
    19 'kick
  • 20 - Platine20 - circuit board
  • 21 - Basisbereich21 - base area
  • 22 - Umformabschnitt22 - forming section
  • 23 - Umformabschnitt23 - forming section
  • 24 - Stoßkante24 - Butt edge
  • 25 - Stoßkante25 - Butt edge
  • 26 - Aufgleitbereich26 - sliding area
  • 27 - Ansatz27 - Approach
  • 28 - Aufgleitbereich28 - sliding area
  • 29 - Umstellung29 - Conversion
  • 30 - Stoßkante 30 - Butt edge
  • 31 - Umformabschnitt31 - forming section
  • 32 - Rohr32 - tube
  • 33 - Mittelabschnitt33 - middle section
  • 34 - Absatz34 - paragraph
  • 35 - Übergangsabschnitt35 - transition section
  • 36 - Längenabschnitt36 - length section
  • 37 - Absatz37 - paragraph
  • 38 - Längenabschnitt38 - section
  • 39 - Längenabschnitt39 - section
  • 40 - Rohr40 - tube
  • 41 - Umfang v. 4041 - scope of 40
  • 42 - Halter42 - holder
  • 43 - Mittelbereich43 - mid-range
  • 44 - Umformabschnitt44 - forming section
  • 45 - Mantelfläche v. 4045 - lateral surface of 40
  • 46 - Längskante46 - long edge
  • 47 - Längskante47 - Long edge
  • 48 - Platine48 - circuit board
  • 49 - Bereich v. 4849 - area from 48
  • 50 - Bereich v. 4850 - area from 48
  • 51 - Bereich v. 4851 - area from 48
  • 52 - Bereich v. 4852 - area from 48
  • 53 - Übergang53 - transition
  • 54 - Übergang54 - transition
  • 55 - Übergang55 - transition
  • 56 - Unterseite v. 4856 - bottom of v. 48
  • 57 - Oberfläche v. 4857 - surface of 48
  • 58 - Basisbereich58 - Base area
  • 59 - Umformabschnitt59 - Forming section
  • MLA- MittellängsachseMLA central longitudinal axis
  • s1 - Platinendicke v. 49s 1 - board thickness v. 49
  • s2 - Platinendicke v. 50s 2 - board thickness v. 50
  • s3 - Platinendicke v. 51s 3 - board thickness v. 51
  • s4 - Platinendicke v. 52s 4 - board thickness v. 52
  • WR - WalzrichtungWR - rolling direction

    • Claims (6)

    1. A method of producing a tube with portions having different cross-sectional configurations, characterised by the following steps:
      a) Producing a blank (1, 14, 20, 48) having a rectangular base region (2, 11', 21, 43) to which at least one shaped portion (3, 15, 44, 59) is integrally attached,
      b) Shaping the base region (2, 11', 21, 43) as a tube and shaping the shaped region (3, 15, 44, 59) as a spiral,
      c) Giving the tube its final shape,
      d) Joining the abutting edges (6, 7, 8, 9, 17, 17', 18, 18', 19, 19', 46, 47).
    2. A method according to claim 1, characterised in that the abutting edges (6, 7, 17, 17') in the base region are joined at least at places before final shaping.
    3. A method according to claim 1 or 2 for producing a tube having a frusto-conically widening cross-section at at least one end, characterised by use of a blank (1, 14, 21) comprising a shaped portion (3, 15, 22) having a trapezoidal configuration at one end and symmetrical along its central longitudinal axis (MLA).
    4. A method according to claim 3, characterised by use of a blank (14, 21) wherein additional trapezoidal and/or rectangular shaped portions (16, 23) adjoin the trapezoidal shaped portion (15, 22).
    5. A method according to any of claims 1 to 4, characterised in that a sloping sliding region (26, 28) is associated with the shaped portion (23, 31).
    6. A method according to any of claims 1 to 5, characterised in that before being shaped, the blank (48) is deformed in controlled manner by rolling so that the thickness (s1-s4) of the blank varies from one place to another in the direction of rolling (WR).
    EP97101610A 1996-02-07 1997-02-03 Method of manufacturing a tube with variable cross-section Expired - Lifetime EP0788848B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19604368A DE19604368C2 (en) 1996-02-07 1996-02-07 Process for producing a pipe with sections of different cross-sectional configurations
    DE19604368 1996-02-07

    Publications (2)

    Publication Number Publication Date
    EP0788848A1 EP0788848A1 (en) 1997-08-13
    EP0788848B1 true EP0788848B1 (en) 2000-12-27

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    Application Number Title Priority Date Filing Date
    EP97101610A Expired - Lifetime EP0788848B1 (en) 1996-02-07 1997-02-03 Method of manufacturing a tube with variable cross-section

    Country Status (5)

    Country Link
    US (1) US5836189A (en)
    EP (1) EP0788848B1 (en)
    DE (1) DE19604368C2 (en)
    ES (1) ES2155637T3 (en)
    PT (1) PT788848E (en)

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    US20040250404A1 (en) * 2003-01-14 2004-12-16 Cripsey Timothy J. Process for press forming metal tubes
    US20060096099A1 (en) * 2003-05-08 2006-05-11 Noble Metal Processing, Inc. Automotive crush tip and method of manufacturing
    CA2526929A1 (en) * 2003-05-08 2004-11-25 Prototube, Inc. Process for press forming metal tubes
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    DE102004017343A1 (en) * 2004-04-06 2005-11-03 Muhr Und Bender Kg Method for producing profiles with a longitudinally variable cross section
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    DE102005011764A1 (en) * 2005-03-11 2006-09-14 Muhr Und Bender Kg Tubes with integrated flange, in particular of flexibly rolled material, for chassis and body structural parts
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    CN104275365B (en) * 2013-07-10 2016-09-14 祥伟自动科技股份有限公司 The manufacture method of hollow rank pipe
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    Also Published As

    Publication number Publication date
    PT788848E (en) 2001-04-30
    DE19604368C2 (en) 1999-12-30
    EP0788848A1 (en) 1997-08-13
    DE19604368A1 (en) 1997-08-14
    US5836189A (en) 1998-11-17
    ES2155637T3 (en) 2001-05-16

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