EP1268118A1 - Tailored tubular blanks and a method for the production thereof - Google Patents

Tailored tubular blanks and a method for the production thereof

Info

Publication number
EP1268118A1
EP1268118A1 EP01905565A EP01905565A EP1268118A1 EP 1268118 A1 EP1268118 A1 EP 1268118A1 EP 01905565 A EP01905565 A EP 01905565A EP 01905565 A EP01905565 A EP 01905565A EP 1268118 A1 EP1268118 A1 EP 1268118A1
Authority
EP
European Patent Office
Prior art keywords
seam
tailored
longitudinal
weld seam
seams
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.)
Withdrawn
Application number
EP01905565A
Other languages
German (de)
French (fr)
Inventor
Bruno Walter Kaegi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elpatronic AG
Original Assignee
Elpatronic AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Elpatronic AG filed Critical Elpatronic AG
Publication of EP1268118A1 publication Critical patent/EP1268118A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/04—Welding for other purposes than joining, e.g. built-up welding
    • B23K9/042—Built-up welding on planar surfaces
    • 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
    • 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
    • B21C37/083—Supply, or operations combined with supply, of strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/18—Sheet panels
    • B23K2101/185—Tailored blanks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/139—Open-ended, self-supporting conduit, cylinder, or tube-type article

Definitions

  • the invention relates to tailored tubular blanks according to the preamble of
  • Claim 1 a set of several such tailored tubular blanks according to claim 6 and a method for their production according to claim 7.
  • Tailored tubular blanks are welded bodies that are open at the ends, either in the form of a simple tube, but also with a non-round cross-section or a cross-section that changes over the length, which can lead to a cylindrical or conical or irregular shape over the length.
  • the shape depends on the intended use and is designed for this. For the sake of simplicity, these irregularly shaped bodies are referred to below as "pipes".
  • Tailored tubular blanks are characterized by the fact that they are made from two or more sheets of different thickness and / or material quality and / or coating. The construction of such tailored tubular blanks from sheet metal with different properties results in tubes that are specially adapted in sections to the respective requirements.
  • Tailored tubular blanks of this type can be used as such or - in the main use case - can be further processed by shaping, in particular hydraulic shaping (hydroforming) to give hollow bodies of complex shape.
  • Such hollow or shaped bodies are used, for example, in automobile construction, e.g. as load-bearing components in the body (pillars, roof rails, threshold profiles, etc.) and in the substructure (chassis parts, chassis beams, cross members, muffler and catalyst housings, etc.). Areas of application other than automobile construction are also possible, especially where spatially complicated framework parts are to be used.
  • tailored tubular blanks are generally used in the technical language and therefore also in this application; in analogy to the well-known level “tailored blanks", which are also called “load-adapted blanks” in German, the “tailored tubular blanks” can also be used by "load-adapted pipes” are spoken.
  • FIGS. 1 a - 1 c show a first variant with parallel longitudinal seams, FIG. 1 a showing the flat tailored blank 1 made of sheets 1 and 2 with the weld seam 3.
  • Figure 1b shows the welded tube (tailored tubular blank) from above with the longitudinal pipe weld 4 and Figure 1c shows a cross section through the tube.
  • FIGS. 2a-2c show the corresponding tailored tubular blank (blank) with the sheets 1 and 2 and the weld seam 3, which forms the circumferential weld seam 3 after forming into a tube in the tube shown in Figure 2b (tailored tubular blanks), which forms with the Pipe longitudinal weld 4 crosses.
  • FIG. 2 c shows a cross section through such a tailored tubular blank in the area of the sheet 2. Tailored tubular blanks with transverse division, as shown in FIGS concentrate and the heat affected zones (edge areas of the actual welding zone) overlap the two seams.
  • the invention is therefore based on the object of creating tailored tubular blanks with circumferential seam and longitudinal seam, in which the disadvantages mentioned do not occur or at least to a greatly reduced extent.
  • peripheral seam or the peripheral seams if several are provided, do not intersect with the longitudinal seam or the longitudinal seams if several are provided, the above-mentioned disadvantages are largely eliminated.
  • Non-crossing seams only meet, so that one can speak of T-joints, although the seams do not usually meet at right angles.
  • Such T-joints have a low concentration of welding stresses in the area of the seam joints than is the case with crossed seams, which results in better formability.
  • the risk of welding errors when welding butt joints is less than when welding crossed seams.
  • the butt joints of the seams can also be better targeted at places that are weakly loaded technically.
  • the invention is further based on the object of providing a method for providing tailored tubular blanks which do not have the disadvantages mentioned.
  • Figures 1a - 1c a blank (tailored blank), a tailored tubular blank in plan view and a cross section through the same according to the prior art;
  • Figures 2a - 2c also a pre-board, a tailored tubular blank and a cross section according to the prior art;
  • FIGS. 3a-3c a first exemplary embodiment of the invention, likewise with a blank, tailored tubular blank and cross section;
  • FIGS 4a-4c another embodiment in which pipe sections are connected at their ends
  • Figures 5a and 5b another embodiment with pre-board and Tailored tubular blank in top view
  • FIGS. 6a and 6b show a further exemplary embodiment with a blank and tailored tubular blank
  • FIG. 7 shows an embodiment of a pre-board
  • FIG. 8 shows a further exemplary embodiment of a pre-circuit board.
  • FIGS. 1a-1b show an already explained example of tailored tubular blanks according to the prior art, the embodiment of which does not form the subject of the present invention.
  • FIGS. 2a-2c show an exemplary embodiment of tailored tubular blanks with longitudinal seam and circumferential seam according to the prior art, the improvement of which is the subject of the present invention.
  • FIG. 3a shows a first exemplary embodiment of tailored tubular blanks according to the invention, FIG. 3a showing the tailored blank or the blank 10 from which the tube frame is formed by any known tube bending method, which is then welded to the tube.
  • the pre-circuit board 10 is formed by welding two sheets 11 and 12 which are connected to one another by means of an obliquely running weld seam 13.
  • the sheets 11 and 12 can be any known sheets of different thickness and / or with different sheet properties, as is known in principle in the formation of tailored tubular blanks. If the pre-circuit board is shaped into a tube, in which the edges 16 and 17 of the circuit board are deformed away from the viewer from the plane of the drawing, a tube frame is created according to the top view of FIG.
  • FIGS. 4a-4c show a further embodiment of tailored tubular blanks according to the invention, a tube 30 being shown as an example, which has a continuous circumferential seam 33 to which two longitudinal seams 31 and 32 do not adjoin in the butt joint, the butt joints also with 34 and 35 are designated. Here, too, the joints are spaced apart from one another by a preselected amount.
  • FIG. 4c shows the two tubes 36 and 37, which serve as starting parts with longitudinal weld seams 31 and 32 for tailored tubular blanks according to FIG. 4a.
  • the tubes 36 and 37 are in turn preferably formed from metal sheets with different thicknesses and / or different material properties.
  • FIG. 4b shows a cross section through the tailored tubular blank 30 from FIG. 4a in the area of the pipe 37.
  • the present tubes 36 and 37 become conscious in the present case for the formation of tailored tubular blanks and are connected to one another with a preselected offset d of the longitudinal weld seams in an industrial environment and with as constant an offset d as possible, so that during production Set of tailored tubular blanks is produced with the same offset. Furthermore, there are tubes 30 or tailored tubular blanks which are composed of different tube parts 36 and 37.
  • Figures 5a and 5b show a further embodiment similar to that of Figures 3a and 3b, in which, however, the pre-plate 40 is composed of three sheets 41, 42 and 43, for which purpose the weld seams 44 and 45 are provided. Corresponding butt joints 46-49 are formed in the tailored tubular blank 50 with their longitudinal weld seam 51.
  • all three sheets 41-43 can have different thicknesses and / or Have material properties or two of the sheets, for example 41 and 43, can be similar sheets and the sheet 42 can be a sheet with different properties.
  • a longitudinal member can be produced which has a high strength in the middle and a lower strength or a desired compression behavior at its ends.
  • the seams 44 and 45 can run obliquely and the other seam, as in the prior art, can run straight and thus cross the longitudinal seam if this is desired.
  • FIGS. 6a and 6b show a further exemplary embodiment, in which in turn the pre-circuit board 60 is composed of three metal sheets, in which case the one seam 65 in the corresponding tailored tubular blanks 69 forms a longitudinal weld seam and the oblique weld seam 64 forms the circumferential seam.
  • the sheets 65, 62 and 63 can in turn have different thicknesses and material properties, and the butt joints 66 and 67 which arise in the tailored tubular blanks, as in the examples already shown, have the advantages mentioned compared to a crossing course according to the prior art of the weld seams.
  • FIG. 7 shows a further pre-circuit board, in which it is readily apparent that in this case the joints 74 and 75 of the weld seam 73, which connects the sheets 71 and 72, are at right angles to the longitudinal weld seam in the tailored tubular blanks.
  • this case one can speak of a T-shaped butt, whereby this designation can also be used for the other butt joints according to the invention, even if the seams do not meet exactly at right angles.
  • FIG. 8 shows a further example of a pre-plate 80 with three welded sheets 81, 82 and 83, the joints of the weld seams 84 and 86 with the longitudinal weld seam of the tubular frame formed from this pre-plate or subsequently welded tailored tubular blanks also having a predetermined offset along the longitudinal weld seam and form a joint with the longitudinal weld without crossing.
  • a recess could also be provided, which also on the tailored Tubular blank forms a recess.

Abstract

In order to form tailored tubular blanks (20), the girth weld seam (13) and the longitudinal weld seam (18) are positioned in such a way that the seams do not intersect one another, but merely form a junction point (14, 15). This enables the production of tailored tubular blanks which have improved ductility.

Description

Tailored Tubular Blanks und Verfahren zu deren Herstellung Tailored tubular blanks and process for their manufacture
Die Erfindung betrifft Tailored Tubular Blanks gemäss Oberbegriff desThe invention relates to tailored tubular blanks according to the preamble of
Anspruchs 1 , einen Satz mehrerer solcher Tailored Tubular Blanks gemäss Anspruch 6 und ein Verfahren zu deren Herstellung gemäss Anspruch 7.Claim 1, a set of several such tailored tubular blanks according to claim 6 and a method for their production according to claim 7.
Tailored Tubular Blanks sind geschweisste, an den Enden offene Körper entweder in der Gestalt eines einfachen Rohrs, aber auch mit nicht rundem Querschnitt bzw einem über die Länge sich veränderndem Querschnitt, was über die Länge zu zylindrischer oder konischer oder unregelmässiger Form führen kann. Die Formgebung hängt vom späteren Einsatzzweck ab und ist auf diesen hin ausgelegt. Der Einfachheit halber werden nachstehend diese auch unregelmässig geformten Körper als "Rohre" bezeichnet. Tailored Tubular Blanks zeichnen sich dadurch aus, dass sie aus zwei oder mehreren Blechen unterschiedlicher Dicke und/oder Werkstoffqualität und/oder Beschichtung gefertigt sind. Der Aufbau solcher Tailored Tubular Blanks aus Blechen mit verschiedenen Eigenschaften ergibt Rohre, die abschnittsweise speziell an die jeweiligen Anforderungen angepasst sind. Solche Tailored Tubular Blanks können als solche verwendet werden oder - im hauptsächlichen Verwendungsfall - durch Umformen, insbesondere hydraulisches Umformen (Hydroforming) zu kompliziert geformten Hohlkörpern weiterverarbeitet werden. Solche Hohl- bzw. Formkörper werden z.B. im Automobilbau eingesetzt, z.B. als tragende Komponenten in der Karosserie (Säulen, Dachreling, Schwellenprofile usw.) und im Unterbau (Fahrwerksteile, Chassisträger, Querträger, Schalldämpfer- und Katalisatorengehäuse usw.). Andere Einsatzgebiete als der Automobilbau sind auch möglich, insbesondere dort, wo räumlich komplizierte Fachwerkteile eingesetzt werden sollen. Der Fachbegriff " Tailored Tubular Blanks " wird in der Fachsprache allgemein und daher auch in dieser Anmeldung verwendet; in Analogie zu den bekannten ebenen "Tailored Blanks", die auf Deutsch auch als "belastungsangepasste Platinen" bezeichnet werden, kann bei den " Tailored Tubular Blanks " auch von "belastungsangepassten Rohren" gesprochen werden.Tailored tubular blanks are welded bodies that are open at the ends, either in the form of a simple tube, but also with a non-round cross-section or a cross-section that changes over the length, which can lead to a cylindrical or conical or irregular shape over the length. The shape depends on the intended use and is designed for this. For the sake of simplicity, these irregularly shaped bodies are referred to below as "pipes". Tailored tubular blanks are characterized by the fact that they are made from two or more sheets of different thickness and / or material quality and / or coating. The construction of such tailored tubular blanks from sheet metal with different properties results in tubes that are specially adapted in sections to the respective requirements. Tailored tubular blanks of this type can be used as such or - in the main use case - can be further processed by shaping, in particular hydraulic shaping (hydroforming) to give hollow bodies of complex shape. Such hollow or shaped bodies are used, for example, in automobile construction, e.g. as load-bearing components in the body (pillars, roof rails, threshold profiles, etc.) and in the substructure (chassis parts, chassis beams, cross members, muffler and catalyst housings, etc.). Areas of application other than automobile construction are also possible, especially where spatially complicated framework parts are to be used. The technical term "tailored tubular blanks" is generally used in the technical language and therefore also in this application; in analogy to the well-known level "tailored blanks", which are also called "load-adapted blanks" in German, the "tailored tubular blanks" can also be used by "load-adapted pipes" are spoken.
Die Tailored Tubular Blanks werden mit Strahlschweissverfahren (Laser-, Elektronenstrahl- oder Widerstands-Lichtbogenschweissung) gefügt, wobei zunächst ein Tailored Blank auf bekannte Weise zu einem Rohr gerundet wird, und anschliessend die Rohrlängsschweissnaht gesetzt wird. Die Figuren 1a - 1c sowie 2a - 2c zeigen zwei verschiedene Varianten von Tailored Tubular Blanks nach Stand der Technik. Die Figuren 1a - 1c zeigen eine erste Variante mit parallelen Längsnähten, wobei Figur 1a das ebene Tailored Blank 1 aus den Blechen 1 und 2 mit der Schweissnaht 3 zeigt. Figur 1b zeigt das geschweisste Rohr (Tailored Tubular Blank) von oben mit der Rohrlängsschweissnaht 4 und Figur 1c zeigt einen Querschnitt durch das Rohr. Die vorliegende Erfindung betrifft keine derartigen Tailored Tubular Blanks mit ausschliesslich längs verlaufenden Schweissnähten, sondern Tailored Tubular Blanks wie in den Figuren 2a - 2c gezeigt mit Umfangsund Längsnaht. Figur 2a zeigt dabei das entsprechende Tailored Tubular Blank (Vorplatine) mit den Blechen 1 und 2 und der Schweissnaht 3, die nach der Umformung zu einem Rohr beim in Figur 2b gezeigten Rohr (Tailored Tubular Blanks) die Umfangsschweissnaht 3 bildet, die sich mit der Rohrlängsschweissnaht 4 kreuzt. Figur 2c zeigt einen Querschnitt durch eine solche Tailored Tubular Blank im Bereich des Bleches 2. Tailored Tubular Blanks mit Querteilung, wie in Figur 2a - 2c gezeigt, können Nachteile bei der späteren Umformung (z.B. mittels Hydroforming) aufweisen, da sich die Schweissspannungen im Kreuzungspunkt konzentrieren und sich die Wärmeeinflusszonen (Randbereiche der eigentlichen Schweisszone) der beiden Nähte überlagern. Im Nahtkreuzungspunkt besteht ferner ein erhöhtes Risiko von Schweissfehlem. Durch eine möglichst gute Beherrschung des Schweissverfahrens wird bis anhin versucht diese Nachteile möglichst nicht auftreten zu lassen oder sie so gering zu halten, dass sie bei der Umformung keine Rolle spielen. Die Wahl und Einhaltung entsprechender Schweissparameter ist indes je nach den Eigenschaften der Bleche schwierig. Der Erfindung liegt deshalb die Aufgabe zugrunde, Tailored Tubular Blanks mit Umfangsnaht und Längsnaht zu schaffen, bei welchen die genannten Nachteile nicht oder jedenfalls in stark vermindertem Mass auftreten.The tailored tubular blanks are joined using a beam welding process (laser, electron beam or resistance arc welding), whereby a tailored blank is first rounded to a tube in a known manner, and then the longitudinal tube weld is made. Figures 1a-1c and 2a-2c show two different variants of tailored tubular blanks according to the prior art. FIGS. 1 a - 1 c show a first variant with parallel longitudinal seams, FIG. 1 a showing the flat tailored blank 1 made of sheets 1 and 2 with the weld seam 3. Figure 1b shows the welded tube (tailored tubular blank) from above with the longitudinal pipe weld 4 and Figure 1c shows a cross section through the tube. The present invention does not relate to such tailored tubular blanks with exclusively longitudinal weld seams, but rather tailored tubular blanks with circumferential and longitudinal seams as shown in FIGS. 2a-2c. Figure 2a shows the corresponding tailored tubular blank (blank) with the sheets 1 and 2 and the weld seam 3, which forms the circumferential weld seam 3 after forming into a tube in the tube shown in Figure 2b (tailored tubular blanks), which forms with the Pipe longitudinal weld 4 crosses. FIG. 2 c shows a cross section through such a tailored tubular blank in the area of the sheet 2. Tailored tubular blanks with transverse division, as shown in FIGS concentrate and the heat affected zones (edge areas of the actual welding zone) overlap the two seams. There is also an increased risk of welding defects at the seam crossing point. By using the welding process as well as possible, attempts have so far been made to prevent these disadvantages from occurring or to keep them so low that they play no role in the forming process. The choice and compliance with appropriate welding parameters is difficult, depending on the properties of the sheets. The invention is therefore based on the object of creating tailored tubular blanks with circumferential seam and longitudinal seam, in which the disadvantages mentioned do not occur or at least to a greatly reduced extent.
Diese Aufgabe wird bei Tailored Tubular Blanks der eingangs genannten Art mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. ,This object is achieved in tailored tubular blanks of the type mentioned at the outset with the characterizing features of claim 1. .
Dadurch, dass die Umfangsnaht, oder die Umfangsnähte falls mehrere solche vorgesehen sind, sich nicht mit der Längsnaht bzw. den Längsnähten falls mehrere solche vorgesehen sind, kreuzen, entfallen die oben genannten Nachteile weitgehend. Nichtkreuzende Nähte stossen lediglich aufeinander, so dass anschaulicherweise von T-Stössen gesprochen werden kann, obwohl in der Regel die Nähte nicht rechtwinklig aufeinanderstossen. Solche T-Stösse weisen eine geringe Konzentration von Schweissspannungen im Bereich der Nahtstösse auf als dies bei gekreuzten Nähten der Fall ist, was eine bessere Umformbarkeit ergibt. Ferner ist die Gefahr von Schweissfehlem beim Schweissen von Stössen geringer als beim Schweissen von gekreuzten Nähten. Die Stossstellen der Nähte können ferner besser gezielt an Stellen gelegt werden, welche umformtechnisch schwach belastet sind.Because the peripheral seam, or the peripheral seams if several are provided, do not intersect with the longitudinal seam or the longitudinal seams if several are provided, the above-mentioned disadvantages are largely eliminated. Non-crossing seams only meet, so that one can speak of T-joints, although the seams do not usually meet at right angles. Such T-joints have a low concentration of welding stresses in the area of the seam joints than is the case with crossed seams, which results in better formability. Furthermore, the risk of welding errors when welding butt joints is less than when welding crossed seams. The butt joints of the seams can also be better targeted at places that are weakly loaded technically.
Der Erfindung liegt weiter die Aufgabe zugrunde ein Verfahren zur Bereitstellung von Tailored Tubular Blanks zu schaffen, welche die genannten Nachteile nicht aufweisen.The invention is further based on the object of providing a method for providing tailored tubular blanks which do not have the disadvantages mentioned.
Diese Aufgabe wird durch ein Verfahren der eingangs genannten Art mit den kennzeichnenden Merkmalen des Anspruchs 7 gelöst.This object is achieved by a method of the type mentioned at the outset with the characterizing features of claim 7.
Im folgenden werden Ausführungsbeispiele der Erfindung anhand der Figuren näher erläutert. Dabei zeigenExemplary embodiments of the invention are explained in more detail below with reference to the figures. Show
Figuren 1a - 1c eine Vorplatine (Tailored Blank), eine Tailored Tubular Blank in Draufsicht und einen Querschnitt durch dieselbe nach Stand der Technik; Figuren 2a - 2c ebenfalls eine Vorplatine, eine Tailored Tubular Blank und einen Querschnitt nach Stand der Technik;Figures 1a - 1c a blank (tailored blank), a tailored tubular blank in plan view and a cross section through the same according to the prior art; Figures 2a - 2c also a pre-board, a tailored tubular blank and a cross section according to the prior art;
Figuren 3a - 3c ein erstes Ausführungsbeispiel der Erfindung ebenfalls mit Vorplatine, Tailored Tubular Blank und Querschnitt;FIGS. 3a-3c a first exemplary embodiment of the invention, likewise with a blank, tailored tubular blank and cross section;
Figuren 4a - 4c ein weiteres Ausführungsbeispiel, bei welchem Rohrabschnitte mit ihren Enden verbunden werden;Figures 4a-4c another embodiment in which pipe sections are connected at their ends;
Figuren 5a und 5b ein weiteres Ausführungsbeispiel mit Vorplatine und Tailored Tubular Blank in Draufsicht;Figures 5a and 5b another embodiment with pre-board and Tailored tubular blank in top view;
Figuren 6a und 6b ein weiteres Ausführungsbeispiel mit Vorplatine und Tailored Tubular Blank;FIGS. 6a and 6b show a further exemplary embodiment with a blank and tailored tubular blank;
Figur 7 ein Ausführungsbeispiel einer Vorplatine; und Figur 8 ein weiteres Ausführungsbeispiel einer Vorplatine.Figure 7 shows an embodiment of a pre-board; and FIG. 8 shows a further exemplary embodiment of a pre-circuit board.
Die Figuren 1a - 1b zeigen ein bereits erläutertes Beispiel für Tailored Tubular Blanks nach Stand der Technik, deren Ausführungsform nicht Gegenstand der vorliegenden Erfindung bildet. Die Figuren 2a - 2c zeigen ein Ausführungsbeispiel für Tailored Tubular Blanks mit Längsnaht und Umfangsnaht nach Stand der Technik, deren Verbesserung Gegenstand der vorliegenden Erfindung ist.FIGS. 1a-1b show an already explained example of tailored tubular blanks according to the prior art, the embodiment of which does not form the subject of the present invention. FIGS. 2a-2c show an exemplary embodiment of tailored tubular blanks with longitudinal seam and circumferential seam according to the prior art, the improvement of which is the subject of the present invention.
Figur 3a zeigt ein erstes Ausführungsbeispiel für Tailored Tubular Blanks gemäss der Erfindung, wobei Figur 3a das Tailored Blank bzw. die Vorplatine 10 zeigt, aus welchem durch irgend ein bekanntes Rohrbiegeverfahren die Rohrzarge geformt wird, die dann zum Rohr verschweisst wird. Die Vorplatine 10 ist durch Schweissung von zwei Blechen 11 und 12 gebildet, welche mittels einer schräg verlaufenden Schweissnaht 13 miteinander verbunden sind. Die Bleche 11 und 12 können dabei beliebige bekannte Bleche unterschiedlicher Dicke und/oder mit unterschiedlichen Blecheigenschaften sein, wie dies grundsätzlich bei der Bildung von Tailored Tubular Blanks bekannt ist. Wird die Vorplatine zum Rohr geformt, in dem die Kanten 16 und 17 der Platine aus der Zeichnungsebene hinaus vom Betrachter weg verformt werden, so entsteht eine Rohrzarge gemäss der Draufsicht von Figur 3b, bei welcher die Kanten 16 und 17 bereits mit einer Schweissnaht 18 verbunden worden sind. Die Schweissnaht 13, welche an den Endpunkten 14 und 15 in die Kanten 16 bzw. 17 läuft, bildet dann mit der Schweissnaht 18 zwei Stossstellen 14 bzw. 15, welche um eine vorbestimmte Distanz voneinander entfernt sind. Der Abstand ergibt sich durch die Schrägstellung der Schweissnaht 13 und kann entsprechend frei gewählt werden und z.B. mehrere Millimeter bis mehrere Zentimeter betragen. Jedes Ende der Schweissnaht 13 trifft dadurch nur im Stoss auf die Schweissnaht 18 und kreuzt diese nicht durchgehend, was die eingangs geschilderten Vorteile bewirkt. Figur 3c zeigt einen Querschnitt durch das Rohr 20 im Bereich des Bleches 12.FIG. 3a shows a first exemplary embodiment of tailored tubular blanks according to the invention, FIG. 3a showing the tailored blank or the blank 10 from which the tube frame is formed by any known tube bending method, which is then welded to the tube. The pre-circuit board 10 is formed by welding two sheets 11 and 12 which are connected to one another by means of an obliquely running weld seam 13. The sheets 11 and 12 can be any known sheets of different thickness and / or with different sheet properties, as is known in principle in the formation of tailored tubular blanks. If the pre-circuit board is shaped into a tube, in which the edges 16 and 17 of the circuit board are deformed away from the viewer from the plane of the drawing, a tube frame is created according to the top view of FIG. 3b, in which the edges 16 and 17 are already connected with a weld seam 18 have been. The weld seam 13, which runs into the edges 16 and 17 at the end points 14 and 15, then forms two butt joints 14 and 15 with the weld seam 18, which are separated from one another by a predetermined distance. The distance results from the inclined position of the weld seam 13 and can accordingly be freely selected and be, for example, several millimeters to several centimeters. As a result, each end of the weld seam 13 only meets the weld seam 18 in an abutting manner and does not cross it continuously, which brings about the advantages described at the outset. Figure 3c shows a cross section through the tube 20 in the region of the sheet 12.
Die Figuren 4a - 4c zeigen eine weitere Ausgestaltung von Tailored Tubular Blanks gemäss der Erfindung, wobei als Beispiel ein Rohr 30 gezeigt ist, welches eine durchgehende Umfangsnaht 33 aufweist, an welche zwei Längsnähte 31 und 32 im Stoss nicht kreuzend anschliessen, wobei die Stossstellen mit 34 bzw. 35 bezeichnet sind. Auch hierbei sind die Stossstellen um einen vorgewählten Betrag voneinander beabstandet. Figur 4c zeigt die beiden Rohre 36 und 37, die als Ausgangsteile mit Längsschweissnähten 31 und 32 für Tailored Tubular Blanks gemäss Figur 4a dienen. Vorzugsweise sind die Rohre 36 und 37 wiederum aus Blechen mit unterschiedlicher Dicke und/oder unterschiedlichen Materialeigenschaften gebildet worden. Die Rohre 36 und 37 werden dann aneinanderliegend durch Schweissung der durchgehenden Umfangsnaht 33 miteinander verbunden, so dass die Tailored Tubular Blank gemäss Figur 4a erzeugt wird. Figur 4b zeigt einen Querschnitt durch die Tailored Tubular Blank 30 von Figur 4a im Bereich des Rohres 37. Entgegen der an sich bekannten Bildung von Rohren aus Rohrabschnitten, bei welchen die Längsnähte in der Regel fluchten, es aber durch Produktionsungenauigkeiten zu mehr oder weniger und unbestimmt grossen Abweichungen vom Fluchten der Längsschweissnähte kommen kann, werden vorliegend zur Bildung von Tailored Tubular Blanks die Ausgangsrohre 36 und 37 bewusst und mit einem vorgewählten Versatz d der Längsschweissnähte in einem industriellen Umfeld und mit möglichst gleichbleibendem Versatz d miteinander verbunden, so dass bei der Produktion ein Satz von Tailored Tubular Blanks mit gleichem Versatz erzeugt wird. Ferner handelt es sich um Rohre 30 bzw. Tailored Tubular Blanks, die aus unterschiedlichen Rohrteilen 36 und 37 zusammengesetzt werden.FIGS. 4a-4c show a further embodiment of tailored tubular blanks according to the invention, a tube 30 being shown as an example, which has a continuous circumferential seam 33 to which two longitudinal seams 31 and 32 do not adjoin in the butt joint, the butt joints also with 34 and 35 are designated. Here, too, the joints are spaced apart from one another by a preselected amount. FIG. 4c shows the two tubes 36 and 37, which serve as starting parts with longitudinal weld seams 31 and 32 for tailored tubular blanks according to FIG. 4a. The tubes 36 and 37 are in turn preferably formed from metal sheets with different thicknesses and / or different material properties. The tubes 36 and 37 are then connected to one another by welding the continuous circumferential seam 33 so that the tailored tubular blank is produced according to FIG. 4a. FIG. 4b shows a cross section through the tailored tubular blank 30 from FIG. 4a in the area of the pipe 37. Contrary to the known formation of pipes from pipe sections, in which the longitudinal seams are generally in alignment, but due to production inaccuracies it becomes more or less and undetermined large deviations from the alignment of the longitudinal weld seams, the present tubes 36 and 37 become conscious in the present case for the formation of tailored tubular blanks and are connected to one another with a preselected offset d of the longitudinal weld seams in an industrial environment and with as constant an offset d as possible, so that during production Set of tailored tubular blanks is produced with the same offset. Furthermore, there are tubes 30 or tailored tubular blanks which are composed of different tube parts 36 and 37.
Die Figuren 5a und 5b zeigen ein weiteres Ausführungsbeispiel ähnlich demjenigen der Figuren 3a und 3b, bei welchem indes die Vorplatine 40 aus drei Blechen 41 , 42 und 43 zusammengesetzt ist, wozu die Schweissnähte 44 und 45 vorgesehen sind. Entsprechende Stossstellen 46-49 werden beim Tailored Tubular Blank 50 mit deren Längsschweissnaht 51 ausgebildet. Auch hierbei können natürlich alle drei Bleche 41-43 unterschiedliche Dicke und/ oder Materialeigenschaften aufweisen oder zwei der Bleche, z.B. 41 und 43, können gleichartige Bleche sein und das Blech 42 kann ein Blech mit unterschiedlichen Eigenschaften sein. Es kann dadurch z.B. nach der Umformung der Tailored Tubular Blanks 50, z.B. durch Hydroformen, ein Längsträger entstehen, der in seiner Mitte eine hohe Festigkeit und an seinen Enden eine geringere Festigkeit bzw. ein gewünschtes Stauchverhalten zeigt. Natürlich kann auch nur eine der Nähte 44 und 45 schräg verlaufen und die andere Naht wie im Stand der Technik gerade und damit die Längsnaht kreuzend verlaufen, wenn dies gewünscht ist.Figures 5a and 5b show a further embodiment similar to that of Figures 3a and 3b, in which, however, the pre-plate 40 is composed of three sheets 41, 42 and 43, for which purpose the weld seams 44 and 45 are provided. Corresponding butt joints 46-49 are formed in the tailored tubular blank 50 with their longitudinal weld seam 51. Here too, of course, all three sheets 41-43 can have different thicknesses and / or Have material properties or two of the sheets, for example 41 and 43, can be similar sheets and the sheet 42 can be a sheet with different properties. For example, after the tailored tubular blanks 50 have been reshaped, for example by hydroforming, a longitudinal member can be produced which has a high strength in the middle and a lower strength or a desired compression behavior at its ends. Of course, only one of the seams 44 and 45 can run obliquely and the other seam, as in the prior art, can run straight and thus cross the longitudinal seam if this is desired.
Die Figuren 6a und 6b zeigen ein weiteres Ausführungsbeispiel, bei welchem wiederum die Vorplatine 60 aus drei Blechen zusammengesetzt ist, wobei in diesem Fall die eine Naht 65 bei der entsprechenden Tailored Tubular Blanks 69 eine Längsschweissnaht bildet und die schrägliegende Schweissnaht 64 die Umfangsnaht bildet. Die Bleche 65, 62 und 63 können dabei wiederum verschiedene Dicken und Materialeigenschaften aufweisen und die sich bei den Tailored Tubular Blanks einstellenden Stossstellen 66 und 67 weisen wie bei den bereits gezeigten Beispielen die genannten Vorteile gegenüber einem kreuzenden Verlauf nach Stand der Technik der Schweissnähte auf.FIGS. 6a and 6b show a further exemplary embodiment, in which in turn the pre-circuit board 60 is composed of three metal sheets, in which case the one seam 65 in the corresponding tailored tubular blanks 69 forms a longitudinal weld seam and the oblique weld seam 64 forms the circumferential seam. The sheets 65, 62 and 63 can in turn have different thicknesses and material properties, and the butt joints 66 and 67 which arise in the tailored tubular blanks, as in the examples already shown, have the advantages mentioned compared to a crossing course according to the prior art of the weld seams.
Figur 7 zeigt eine weitere Vorplatine, bei welcher ohne weiteres ersichtlich ist, dass in diesem Fall die Stossstellen 74 und 75 der Schweissnaht 73, welche die Bleche 71 und 72 verbindet, bei den Tailored Tubular Blanks rechtwinklig zur Längsschweissnaht liegen. Es kann in diesem Fall von einem T-förmigen Stoss gesprochen werden, wobei diese Bezeichnung auch für die anderen Stossstellen gemäss der Erfindung verwendet werden kann, auch wenn die Nähte nicht genau rechtwinklig aufeinandertreffen. Figur 8 zeigt ein weiteres Beispiel einer Vorplatine 80 mit drei verschweissten Blechen 81, 82 und 83, wobei die Stossstellen der Schweissnähte 84 und 86 mit der Längsschweissnaht der aus dieser Vorplatine gebildeten Rohrzarge bzw. nachmals verschweissten Tailored Tubular Blanks ebenfalls entlang der Längsschweissnaht einen vorbestimmten Versatz aufweisen und mit der Längsschweissnaht kreuzungsfrei einen Stoss bilden. Anstelle des Bleches 83 könnte auch eine Ausnehmung vorgesehen sein, welche auch an der Tailored Tubular Blank eine Ausnehmung bildet. FIG. 7 shows a further pre-circuit board, in which it is readily apparent that in this case the joints 74 and 75 of the weld seam 73, which connects the sheets 71 and 72, are at right angles to the longitudinal weld seam in the tailored tubular blanks. In this case one can speak of a T-shaped butt, whereby this designation can also be used for the other butt joints according to the invention, even if the seams do not meet exactly at right angles. FIG. 8 shows a further example of a pre-plate 80 with three welded sheets 81, 82 and 83, the joints of the weld seams 84 and 86 with the longitudinal weld seam of the tubular frame formed from this pre-plate or subsequently welded tailored tubular blanks also having a predetermined offset along the longitudinal weld seam and form a joint with the longitudinal weld without crossing. Instead of the sheet 83, a recess could also be provided, which also on the tailored Tubular blank forms a recess.

Claims

Patentansprüche claims
1. Tailored Tubular Blank (20,30,50,69) mit mindestens einer Umfangsschweissnaht (13,33,44,45,64,73,84-86) und mindestens einer1. Tailored tubular blank (20, 30, 50, 69) with at least one circumferential weld seam (13, 33, 44, 45, 64, 73, 84-86) and at least one
Längsschweissnaht (18,31,32,51,65,68), dadurch gekennzeichnet, dass Umfangsnaht und Längsnaht nicht kreuzend im Stoss (14,15,34,35,46- 49,66,67,74,75) aufeinandertreffen.Longitudinal weld seam (18,31,32,51,65,68), characterized in that the circumferential seam and the longitudinal seam do not cross each other in the joint (14,15,34,35,46- 49,66,67,74,75).
2. Tailored Tubular Blank (20,50,69) nach Anspruch 1, dadurch gekennzeichnet, dass die Längsnaht durchgehend ausgebildet ist.2. Tailored tubular blank (20, 50, 69) according to claim 1, characterized in that the longitudinal seam is continuous.
3. Tailored Tubular Blank (30) nach Anspruch 1 , dadurch gekennzeichnet, dass die Umfangsnaht durchgehend ausgebildet ist.3. Tailored tubular blank (30) according to claim 1, characterized in that the peripheral seam is continuous.
4. Tailored Tubular Blank nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Stossstellen der Nähte um eine vorgewählte Distanz voneinander entfernt angeordnet sind.4. Tailored tubular blank according to one of claims 1 to 3, characterized in that the joints of the seams are arranged at a preselected distance from one another.
5. Tailored Tubular Blank nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass diese aus Blechen mit unterschiedlichen Blecheigenschaften und/oder Blechdicken gebildet ist.5. Tailored tubular blank according to one of claims 1 to 4, characterized in that it is formed from sheets with different sheet properties and / or sheet thicknesses.
6. Satz von mehreren industriell gefertigten Tailored Tubular Blanks gleicher Ausbildung mit mindestens einer Umfangsschweissnaht und mindestens einer6. Set of several industrially manufactured tailored tubular blanks of the same design with at least one circumferential weld seam and at least one
Längsschweissnaht, dadurch gekennzeichnet, dass die Umfangsnaht und die Längsnaht im Stoss aufeinandertreffen und die Stossstellen um eine vorgewählte Distanz voneinander entfernt liegen, welche für alle Tailored Tubes des Satzes dieselbe ist. Longitudinal weld seam, characterized in that the circumferential seam and the longitudinal seam meet in the butt and the butt joints are separated by a preselected distance which is the same for all tailored tubes of the set.
7. Verfahren zur Bildung von Tailored Tubular Blanks mit jeweils mindestens einer Umfangsschweissnaht und mindestens einer Längsschweissnaht, dadurch gekennzeichnet, dass die Umfangsnaht und die Längsnaht derart angeordnet werden, dass die Nähte im Stoss aufeinandertreffen.7. Method for forming tailored tubular blanks, each with at least one circumferential weld seam and at least one longitudinal weld seam, characterized in that the circumferential seam and the longitudinal seam are arranged in such a way that the seams meet in the butt joint.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Stossstellen um eine vorgewählte Distanz voneinander entfernt ausgebildet werden. 8. The method according to claim 7, characterized in that the joints are formed by a preselected distance from each other.
9. Verfahren nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass ein Tailored Blank mit mindestens einer Schweissnaht gebildet wird, dass aus dem Tailored Blank eine Rohrzarge geformt wird, wobei die Schweissnaht derart angeordnet ist oder die Rohrzargenformung derart erfolgt, dass die Enden der Schweissnaht an den einander gegenüberliegenden Zargenkanten voneinander beabstandet sind und dass die gegenüberliegenden Zargenkanten mit einer durchgehenden Längsschweissnaht verbunden werden.9. The method according to claim 7 or 8, characterized in that a tailored blank is formed with at least one weld seam, that a tubular frame is formed from the tailored blank, wherein the weld seam is arranged in such a way or the tube frame is shaped such that the ends of the weld seam are spaced apart from each other at the opposite frame edges and that the opposite frame edges are connected with a continuous longitudinal weld seam.
10. Verfahren nach Anspruch 7 und 8, dadurch gekennzeichnet, dass mindestens zwei Rohre mit Längsnähten geschweisst werden, wobei die Rohre insbesondere Rohre mit unterschiedlichen Blechdicken und/oder Blecheigenschaften sind, und dass die Rohre mit zueinander versetzten Längsnähten mit einer durchgehenden Umfangsschweissnaht aneinandergefügt werden. 10. The method according to claim 7 and 8, characterized in that at least two tubes are welded with longitudinal seams, wherein the tubes are in particular tubes with different sheet thicknesses and / or sheet properties, and that the tubes with longitudinal seams offset from one another are joined together with a continuous circumferential weld seam.
EP01905565A 2000-03-23 2001-02-26 Tailored tubular blanks and a method for the production thereof Withdrawn EP1268118A1 (en)

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CH5522000 2000-03-23
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PCT/CH2001/000122 WO2001070447A1 (en) 2000-03-23 2001-02-26 Tailored tubular blanks and a method for the production thereof

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KR20110031959A (en) * 2008-07-10 2011-03-29 쉴로 인더스트리즈 인코포레이티드 Metal forming process and welded coil assembly
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