EP0395626A1 - Preformed part for manufacture of tubular parts with longitudinal seam and tube made therefrom - Google Patents

Preformed part for manufacture of tubular parts with longitudinal seam and tube made therefrom Download PDF

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Publication number
EP0395626A1
EP0395626A1 EP90890108A EP90890108A EP0395626A1 EP 0395626 A1 EP0395626 A1 EP 0395626A1 EP 90890108 A EP90890108 A EP 90890108A EP 90890108 A EP90890108 A EP 90890108A EP 0395626 A1 EP0395626 A1 EP 0395626A1
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EP
European Patent Office
Prior art keywords
fold
pipe
shaped part
edges
longitudinal edges
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.)
Granted
Application number
EP90890108A
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German (de)
French (fr)
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EP0395626B1 (en
Inventor
Josef Dipl.-Ing. Keuschnigg
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Voestalpine Krems GmbH
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Voestalpine Krems GmbH
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Filing date
Publication date
Application filed by Voestalpine Krems GmbH filed Critical Voestalpine Krems GmbH
Priority to CS903489A priority Critical patent/CS348990A2/en
Priority to YU137190A priority patent/YU137190A/en
Priority to HU419690A priority patent/HU208646B/en
Priority to SU4830522 priority patent/RU2026123C1/en
Priority to PL28609690A priority patent/PL286096A1/en
Publication of EP0395626A1 publication Critical patent/EP0395626A1/en
Application granted granted Critical
Publication of EP0395626B1 publication Critical patent/EP0395626B1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture 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
    • B21C37/10Making tubes with riveted seams or with non-welded and non-soldered seams
    • B21C37/104Making tubes with riveted seams or with non-welded and non-soldered seams the tubes having a special shape, e.g. polygonal tubes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06Manufacture 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
    • B21C37/10Making tubes with riveted seams or with non-welded and non-soldered seams
    • B21C37/101Making of the seams

Definitions

  • the invention relates to a molded part made of sheet material for the production of tubular parts with a longitudinal seam, in which the edges of the molded part running parallel to the axis of the tube are connected to one another by a closing device, in particular a fold, the molded part being formed by elastic deformation to form the tube or Pipe piece is closable.
  • the known pipe sections for such ventilation or air conditioning systems are either box-shaped sheet metal pipe sections or wound pipes.
  • DE-AS 25 58 269 relates to a folding machine for connecting segment pipe elbows, without further details on how the segment pipe elbows can be produced.
  • GB-PS 1 536 703 describes a device for the production of sheet metal parts, wherein the sheet metal parts produced in this device should not be bent into tubes or pipe pieces.
  • US Pat. No. 4,462,237 is concerned with the production of spacer frames for insulating glass from metal strips, the profiles being produced in a train by roll forming in a train. Any reference to the production of molded parts, which can then be closed to form a pipe or a piece of pipe, cannot be found in US Pat. No. 4,462,237.
  • the US-PS 4 805 592 is concerned with the connection of metal sheets, a non-positive connection is to be achieved in that tongues are bent up from one sheet, under which the second metal sheet is inserted, whereupon the tongues are pressed down again and at the same time the edge of the second metal sheet is to be deformed.
  • the invention has for its object to provide a molded part of the type mentioned, from which a piece of pipe can be easily produced by closing the preform.
  • this is achieved in that the shaped part is bent or folded parallel to the direction of the axis of the pipe or pipe piece to be produced from the shaped part, the two longitudinal edges of the shaped part forming the seam being at a distance from one another in the relaxed state thereof, which allows insertion another molding allowed, and that the cross section shape of the molded part in the relaxed state of the same has a course which, under the action of the molded part deformed into the tubular part, acts on the latter through the closing device and corresponds to the desired cross-sectional shape of the tubular part.
  • the molded part according to the invention which serves as a preform for the production of pipes or pipe pieces, has the advantage that it can accommodate further molded parts, so that the preforms for the pipes can be easily sized and take up little space.
  • the preform has a flat U-shaped to C-shaped cross-sectional shape, the curvature running in the direction of the longitudinal axis.
  • the preform according to the invention can be used for the production of round, oval, rectangular or generally polygonal cross-sectional shapes with rounded corners.
  • the curvatures in the preform are pre-formed in such a way that the desired tube cross section is created by predominantly elastic compression of the preform.
  • the open curvature of the molded part according to the invention has the curvature profile which, in the closed state, corresponds to the bending line to the circle or the desired cross section in accordance with the bending equation.
  • the preform is defined via the closing condition by the moment equation and the bending equation.
  • the cross-sectional shape of the molded part is defined by the closing force and the closing condition, with additional consideration being given to the fact that several molded parts can be placed one inside the other.
  • a preferred embodiment of such a fold fold is characterized in that one of the edges of the molded part to be connected to one another, as is known per se, is folded outwards, that the opposite edge is shaped into a known loop-like fold fold, into which the fold can be inserted is that the bevel with the molding includes an obtuse angle and that the central plane of the loop-like fold fold includes an acute angle with the plane of the molding, the two angles complementing each other to 180 °.
  • An embodiment which is particularly suitable for preforms for the production of pipe pieces from particularly thin-walled sheet metal, is characterized in that the notch with the molded part includes an obtuse angle and that the central plane of the loop includes an acute angle with the plane of the molded part, whereby complete the two angles to each other to 180 °.
  • FIG. 1 shows a molded part for producing a round tube
  • FIG. 2 shows a molded part for producing a rectangular tube
  • FIG. 3 shows a fold fold
  • FIG. 4 shows a top view of the fold fold of FIG. 3
  • FIG. 5 shows a fold fold, which is divided into several sections and mutually bent over
  • FIG. 6 shows a top view of the fold fold of FIG. 5, FIG. 7 edge regions to be joined together to form a fold fold
  • FIG. 8 shows a further embodiment of a locking device
  • FIG 10 and 11 sectional guides for the production of molded parts for the production of pipe sections
  • FIG. 12 a molded part for the production of the rectangular tube
  • FIG. 13 a tube produced from the molded part of FIG. 12.
  • the molded part 20 is bent while approaching its longitudinal edges 2 and 3 and the bevel is pushed into the loop-shaped fold fold 8, whereby a fold connection 1 is created.
  • the molded part 20 is less pre-bent in the central region between the longitudinal edges 2 and 3 than in the region of its longitudinal edges 2 and 3, since stronger bending moments occur in the central region when bent together than in the region of the longitudinal edges and this central region is therefore deformed more strongly when bent together. Due to the different degrees of pre-bending, the circular cross-sectional shape of the tube is obtained after the shaped part 20 has been bent together.
  • a molded part 21 shown in FIG. 2 can be bent into a tube with a rectangular cross-sectional shape.
  • the longitudinal edges 22, 23 and 24 of the rectangular tube are preformed in the molded part 21.
  • the surfaces can, as indicated by the dashed line, be pre-bent inwards, whereby flat surfaces are formed after the shaped part 21 has been bent together to form the tube.
  • the two surfaces between the edges 22 and 24 of the molded part 21 are more pre-bent than the two surfaces adjacent to the edges 2 and 3, since they deform more when they are bent together.
  • the pre-formed angle enclosed by the surfaces on the longitudinal edge 23 is greater than the angle on the edges 22 and 24.
  • the fourth longitudinal edge is the fold connection 1 formed.
  • FIGS. 12 and 12 An embodiment of a molded part for pipes with a rectangular or square cross section is also possible, in which the fold connection 1 is arranged in the region of a wall of the pipe (cf. FIGS. 12 and 12).
  • a fold connection 1 of the two longitudinal edges 2 and 3 of the molded part 20 closed to the tube is shown.
  • the loop-shaped fold fold 8 is formed on the longitudinal edge 2 and protrudes away from the longitudinal edge 2 at an acute angle.
  • the bevel 9 on the longitudinal edge 3 is folded out from the tangential plane of the longitudinal edge 3 at an obtuse angle corresponding to the fold fold 8 (see FIG. 7).
  • the two longitudinal edges 2 and 3 abut along a foot line 4.
  • the fold fold 8 is bent in a wave shape, as shown in FIG. 4.
  • a fold connection consisting of two bevels 11 and 12 on the two longitudinal edges 2 and 3 and a U-shaped profile strip 10 is shown.
  • the two longitudinal edges of components 2 and 3 are placed flat against one another with their bevels 11 and 12 and then the U-shaped profile strip 10 is pushed over it.
  • it can be bent, as shown in FIGS. 3 and 4. 8 can also be carried out as in FIGS. 5 and 6, the cuts 7 in FIG stood from the free longitudinal edges of the profile strip 10 ends.
  • FIG. 9 shows an air pipe system composed of pipe pieces produced from molded parts according to the invention.
  • the pipe sections 26 are produced from a sheet metal blank 29 shown in FIG. 10.
  • the cut edges 27 and 28 are placed so that the bellies and valleys of the waves that form the cut edge are opposite each other. From the resulting sheet metal blanks 29 are formed into tube pieces 26 with ends lying in planes inclined to the tube axis.
  • FIG. 11 shows a sheet metal blank 29 for the production of tubular pieces with a rectangular cross-sectional shape, the ends of the tubular pieces lying in planes which are inclined to the axis of the tubular pieces.
  • the cut edges 27 here run in a straight line and angled in sections in accordance with the rectangular profile.
  • appropriate cut guides are used for the manufacture of molded parts for the manufacture of pipes with other polygonal cross sections.
  • a shaped part 31 shown in FIG. 12 is used to produce a tube with a rectangular cross section, which is shown in FIG. 13.
  • the fold connection 41 is located in the middle of one of the surfaces, which is composed of the partial surfaces 34 and 36, and is arranged sunk.
  • the surfaces 32 to 36 are pre-bent, the surface 32 being the strongest, the surfaces 33 and 35 less and the partial surfaces 34 and 36 being the least pre-bent.
  • the round edges 37, 38, 39 and 40 are also already pre-bent in the molded part 31, the longitudinal edges 39 and 40 being more pre-bent than the longitudinal edges 37 and 38.
  • the molded parts according to the invention are particularly suitable for the production of combustion chamber tubes and for thin-walled tubes.
  • any other flat material can be used as the material for the molded part, including layered materials such as plastic-coated metal sheets.

Abstract

A preformed part (20) used for the production of tubular parts with a longitudinal seam is bent parallel to the direction of the axis of the tube to be produced from the preformed part (20), the two seam-forming longitudinal edges (2, 3) of the preformed part (20) being at a distance from one another which permits the accommodation of a further preformed part (20). The preformed part (20) can be closed to form a tube piece. In order to take account of the different bending moments and the forces arising from the seaming operation, the preformed part (1) is prebent or edged to a lesser extent between the longitudinal edges (2, 3) than in the region of its longitudinal edges (2, 3). <IMAGE>

Description

Die Erfindung betrifft einen Formteil aus flächigem Werk­stoff zur Herstellung von rohrförmigen Teilen mit Längs­naht, in der die parallel zur Achse des Rohres verlaufen­den Ränder des Formteils durch eine Schließvorrichtung, insbesondere Falzfaltung, miteinander verbunden sind, wo­bei der Formteil durch elastisches Verformen zu dem Rohr bzw. Rohrstück schließbar ist.The invention relates to a molded part made of sheet material for the production of tubular parts with a longitudinal seam, in which the edges of the molded part running parallel to the axis of the tube are connected to one another by a closing device, in particular a fold, the molded part being formed by elastic deformation to form the tube or Pipe piece is closable.

Bei der Herstellung von Rohrleitungen mit größerem Quer­schnitt aus Blechrohren, wie sie für Lüftungs-, Klimaan­lagen u. dgl. verwendet werden, wurden bislang die fer­tigen Rohrstücke zur Baustelle transportiert und dort miteinander zum Rohrleitungssystem zusammengefügt.In the production of pipelines with a larger cross section from sheet metal pipes, such as for ventilation, air conditioning and. Like. Are used, the finished pipe sections have been transported to the construction site and joined together to form the piping system.

Die bekannten Rohrstücke für solche Lüftungs- oder Kli- maanlagen sind entweder kastenförmige Blechrohrabschnitte oder aber gewickelte Rohre.The known pipe sections for such ventilation or air conditioning systems are either box-shaped sheet metal pipe sections or wound pipes.

Dadurch, daß die Rohrstücke fertig zur Baustelle gelie­fert werden, nehmen sie ein unverhältnismäßig großes Transportvolumen ein und es besteht darüber hinaus die Gefahr, daß die Rohrstücke während des Transportes oder beim Transport vom Hersteller zum Verwendungsort bzw. beim Auf- und Abladen beschädigt werden. Man ist daher auch schon dazu übergegangen, bei größeren Baustellen Wickelmaschinen für Lüftungsrohre unmittelbar aufzubauen und die Rohre dort herzustellen.Because the pipe pieces are delivered ready to the construction site, they take up a disproportionately large transport volume and there is also the risk that the pipe pieces are damaged during transport or during transport from the manufacturer to the place of use or during loading and unloading. It has therefore already started to build winding machines for ventilation pipes directly at larger construction sites and to produce the pipes there.

Aus der AT-PS 321 681 ist ein Verfahren zum Herstellen einer Verbindung zweier Flächenelemente bekannt. Bei dem bekannten Verfahren werden die Flächenelemente miteinan­der durch eine Falzfaltung verbunden.From AT-PS 321 681 a method for producing a connection between two surface elements is known. In the known method, the surface elements are connected to one another by a fold.

Die DE-AS 25 58 269 betrifft eine Falzmaschine zur Ver­bindung von Segmentrohrbogen, ohne daß nähere Angaben da­rüber enthalten sind, wie die Segmentrohrbogen selbst hergestellt werden können.DE-AS 25 58 269 relates to a folding machine for connecting segment pipe elbows, without further details on how the segment pipe elbows can be produced.

Die GB-PS 1 536 703 beschreibt eine Vorrichtung zur Her­stellung von Blechformteilen, wobei die in dieser Vor­richtung hergestellten Blechformteile nicht zu Rohren oder Rohrstücken zusammengebogen werden sollen.GB-PS 1 536 703 describes a device for the production of sheet metal parts, wherein the sheet metal parts produced in this device should not be bent into tubes or pipe pieces.

Die US-PS 4 462 237 beschäftigt sich mit der Herstellung von Abstandhalterrahmen für Isolierglas aus Metallbän­dern, wobei die Profile in einer Formstation in einem Zug durch Rollformen hergestellt werden. Irgendein Hinweis auf die Herstellung von Formteilen, die dann zu einem Rohr oder Rohrstück schließbar sind, sind der US-PS 4 462 237 nicht zu entnehmen.US Pat. No. 4,462,237 is concerned with the production of spacer frames for insulating glass from metal strips, the profiles being produced in a train by roll forming in a train. Any reference to the production of molded parts, which can then be closed to form a pipe or a piece of pipe, cannot be found in US Pat. No. 4,462,237.

Die US-PS 4 805 592 beschäftigt sich mit der Verbindung von Metallblechen, wobei eine kraftschlüssige Verbindung dadurch erreicht werden soll, daß aus dem einen Blech Zungen hochgebogen werden, unter die das zweite Metall­blech eingeschoben wird, worauf dann die Zungen wieder niedergedrückt werden und gleichzeitig der Rand des zwei­ten Metallbleches verformt werden soll.The US-PS 4 805 592 is concerned with the connection of metal sheets, a non-positive connection is to be achieved in that tongues are bent up from one sheet, under which the second metal sheet is inserted, whereupon the tongues are pressed down again and at the same time the edge of the second metal sheet is to be deformed.

Der Erfindung liegt die Aufgabe zugrunde, einen Formteil der eingangs genannten Gattung anzugeben, aus dem durch Schließen des Vorformlings ein Rohrstück einfach herge­stellt werden kann.The invention has for its object to provide a molded part of the type mentioned, from which a piece of pipe can be easily produced by closing the preform.

Erfindungsgemäß wird dies dadurch erreicht, daß der Form­teil parallel zur Richtung der Achse des aus dem Formteil herzustellenden Rohres bzw. Rohrstückes gebogen bzw. ge­kantet ist, wobei die beiden die Naht bildenden Längsrän­der des Formteils im entspannten Zustand desselben einen Abstand voneinander aufweisen, der das Einlegen eines weiteren Formteils gestattet, und daß die Querschnitts­ form des Formteils im entspannten Zustand desselben einen Verlauf besitzt, der unter der Einwirkung der im zum rohrförmigen Teil verformten Formteil auf diesen durch die Schließvorrichtung einwirkenden Kräfte und Momente der gewünschten Querschnittsform des rohrförmigen Teils entspricht.According to the invention, this is achieved in that the shaped part is bent or folded parallel to the direction of the axis of the pipe or pipe piece to be produced from the shaped part, the two longitudinal edges of the shaped part forming the seam being at a distance from one another in the relaxed state thereof, which allows insertion another molding allowed, and that the cross section shape of the molded part in the relaxed state of the same has a course which, under the action of the molded part deformed into the tubular part, acts on the latter through the closing device and corresponds to the desired cross-sectional shape of the tubular part.

Der erfindungsgemäße, als Vorformling für die Herstellung von Rohren bzw. Rohrstücken dienende Formteil hat den Vorteil, daß er in sich weitere Formteile aufnehmen kann, so daß sich die Vorformlinge für die Rohre einfach inein­ander schlichten lassen und wenig Raum beanspruchen. Bei­spielsweise besitzt der Vorformling eine flach U-förmige bis C-förmige Querschnittsform, wobei die Krümmung in Richtung der Längsachse verläuft.The molded part according to the invention, which serves as a preform for the production of pipes or pipe pieces, has the advantage that it can accommodate further molded parts, so that the preforms for the pipes can be easily sized and take up little space. For example, the preform has a flat U-shaped to C-shaped cross-sectional shape, the curvature running in the direction of the longitudinal axis.

Der erfindungsgemäße Vorformling kann für die Herstellung runder, ovaler, rechteckiger oder allgemein polygonaler Querschnittsformen mit abgerundeten Ecken verwendet wer­den. Mit Vorteil sind die Krümmungen im Vorformling so vorgebildet, daß durch ein vorwiegend elastisches Zusam­mendrücken des Vorformlings der gewünschte Rohrquer­schnitt entsteht. Die offene Krümmung des erfindungsgemä­ßen Formteils weist im entspannten Zustand den Krümmungs­verlauf auf, der im geschlossenen Zustand entsprechend der Biegegleichung die Biegelinie dem Kreis bzw. dem ge­wünschten Querschnitt entspricht. Ausgehend von der ge­wünschten Endform, z.B. dem kreisrunden Rohr, ist über die Schließbedingung durch die Momentengleichung und die Biegegleichung die Vorform definiert. Die Querschnitts­form des Formteils ist über die Schließkraft und die Schließbedingung definiert, wobei zusätzlich berücksich­tigt ist, daß mehrere Formteile ineinander gelegt werden können.The preform according to the invention can be used for the production of round, oval, rectangular or generally polygonal cross-sectional shapes with rounded corners. Advantageously, the curvatures in the preform are pre-formed in such a way that the desired tube cross section is created by predominantly elastic compression of the preform. In the relaxed state, the open curvature of the molded part according to the invention has the curvature profile which, in the closed state, corresponds to the bending line to the circle or the desired cross section in accordance with the bending equation. Based on the desired final shape, e.g. the circular tube, the preform is defined via the closing condition by the moment equation and the bending equation. The cross-sectional shape of the molded part is defined by the closing force and the closing condition, with additional consideration being given to the fact that several molded parts can be placed one inside the other.

Für die Verbindung der beiden Ränder zur Naht des Rohr­stückes bei der Herstellung desselben aus dem Vorformling gibt es die verschiedensten Möglichkeiten. Bevorzugt wird eine falzartige Verbindung gewählt, die sich ohne großen Aufwand schließen läßt. Bevorzugte Ausgestaltungen hiefür und für die Sicherung des gebildeten Falzes sind Gegen­stand der Unteransprüche.There are many different ways of connecting the two edges to the seam of the tube piece when producing the same from the preform. Is preferred selected a fold-like connection that can be closed without much effort. Preferred configurations for this and for securing the fold formed are the subject of the dependent claims.

Eine bevorzugte Ausführungsform einer solchen Falzfaltung zeichnet sich dadurch aus, daß einer der miteinander zu verbindenden Ränder des Formteiles, wie an sich bekannt, nach außen abgekantet ist, daß der gegenüberliegende Rand zu einer an sich bekannten schlaufenartigen Falzfaltung geformt ist, in den die Abkantung einführbar ist, daß die Abkantung mit dem Formteil einen stumpfen Winkel ein­schließt und daß die Mittelebene der schlaufenartigen Falzfaltung mit der Ebene des Formteiles einen spitzen Winkel einschließt, wobei sich die beiden Winkel zueinan­der auf 180° ergänzen.A preferred embodiment of such a fold fold is characterized in that one of the edges of the molded part to be connected to one another, as is known per se, is folded outwards, that the opposite edge is shaped into a known loop-like fold fold, into which the fold can be inserted is that the bevel with the molding includes an obtuse angle and that the central plane of the loop-like fold fold includes an acute angle with the plane of the molding, the two angles complementing each other to 180 °.

Eine Ausführungsform, die sich besonders für Vorformlinge zur Herstellung von Rohrstücken aus besonders dünnwandi­gem Blech eignet, ist dadurch gekennzeichnet, daß die Ausklinkung mit dem Formteil einen stumpfen Winkel ein­schließt und daß die Mittelebene der Schlaufe mit der Ebene des Formteiles einen spitzen Winkel einschließt, wobei sich die beiden Winkel zueinander auf 180° ergän­zen.An embodiment, which is particularly suitable for preforms for the production of pipe pieces from particularly thin-walled sheet metal, is characterized in that the notch with the molded part includes an obtuse angle and that the central plane of the loop includes an acute angle with the plane of the molded part, whereby complete the two angles to each other to 180 °.

Weitere Einzelheiten der Erfindung ergeben sich aus der nachstehenden Beschreibung bevorzugter, in den Zeichnun­gen gezeigter Ausführungsbeispiele. Es zeigt: Fig. 1 ei­nen Formteil zur Herstellung eines runden Rohres, Fig. 2 einen Formteil zur Herstellung eines rechteckigen Rohres, Fig. 3 eine Falzfaltung, Fig. 4 eine Draufsicht auf die Falzfaltung von Fig. 3, Fig. 5 eine Falzfaltung, die in mehrere Abschnitte unterteilt und wechselseitig umgebogen ist, Fig. 6 eine Draufsicht auf die Falzfaltung von Fig. 5, Fig. 7 miteinander zu einer Falzfaltung zu ver­bindende Randbereiche, Fig. 8 eine weitere Ausführungs­form einer Schließvorruchtung, Fig. 9 ein aus Rohrstücken zusammengesetztes Luftrohrsystem, die Fig. 10 und 11 Schnittführungen zur Herstellung von Formteilen für die Herstellung von Rohrstücken, Fig. 12 einen Formteil zur Herstellung des rechteckförmigen Rohres und Fig. 13 ein aus dem Formteil von Fig. 12 hergestelltes Rohr.Further details of the invention result from the following description of preferred exemplary embodiments shown in the drawings. 1 shows a molded part for producing a round tube, FIG. 2 shows a molded part for producing a rectangular tube, FIG. 3 shows a fold fold, FIG. 4 shows a top view of the fold fold of FIG. 3, FIG. 5 shows a fold fold, which is divided into several sections and mutually bent over, FIG. 6 shows a top view of the fold fold of FIG. 5, FIG. 7 edge regions to be joined together to form a fold fold, FIG. 8 shows a further embodiment of a locking device, FIG 10 and 11 sectional guides for the production of molded parts for the production of pipe sections, FIG. 12 a molded part for the production of the rectangular tube and FIG. 13 a tube produced from the molded part of FIG. 12.

Ein in Fig. 1 dargestellter Formteil 20 ist etwa C-förmig vorgebogen und weist an seinem Längsrand 2 eine schlau­fenförmige Falzfaltung 8 und an seinem Längsrand 3 eine Abkantung 9 auf. Zur Herstellung eines runden Rohres, wie in Fig. 1 strichliert dargestellt, wird der Formteil 20 unter Annäherung seiner Längsränder 2 und 3 gebogen und die Abkantung in die schlaufenförmige Falzfaltung 8 ge­schoben, wodurch eine Falzverbindung 1 geschaffen wird. Der Formteil 20 ist im Mittelbereich zwischen den Längs­rändern 2 und 3 weniger stark vorgebogen als im Bereich seiner Längsränder 2 und 3, da beim Zusammenbiegen im Mittelbereich stärkere Biegemomente auftreten als im Be­reich der Längsränder und sich dieser Mittelbereich daher beim Zusammenbiegen stärker verformt. Durch das unter­schiedlich starke Vorbiegen erhält man nach dem Zusammen­biegen des Formteils 20 die kreisrunde Querschnittsform des Rohres.1 is pre-bent approximately C-shaped and has a loop-shaped fold fold 8 on its longitudinal edge 2 and a bevel 9 on its longitudinal edge 3. To produce a round tube, as shown in dashed lines in Fig. 1, the molded part 20 is bent while approaching its longitudinal edges 2 and 3 and the bevel is pushed into the loop-shaped fold fold 8, whereby a fold connection 1 is created. The molded part 20 is less pre-bent in the central region between the longitudinal edges 2 and 3 than in the region of its longitudinal edges 2 and 3, since stronger bending moments occur in the central region when bent together than in the region of the longitudinal edges and this central region is therefore deformed more strongly when bent together. Due to the different degrees of pre-bending, the circular cross-sectional shape of the tube is obtained after the shaped part 20 has been bent together.

Ein in Fig. 2 dargestellter Formteil 21 kann zu einem Rohr mit rechteckförmiger Querschnittsform zusammengebo­gen werden. Die Längskanten 22, 23 und 24 des rechteck­förmigen Rohres sind im Formteil 21 vorgeformt. Auch die Flächen können, wie durch die strichlierte Linie angedeu­tet, nach innen vorgebogen sein, wodurch nach dem Zusam­menbiegen des Formteiles 21 zum Rohr ebene Flächen ent­stehen. Die beiden Flächen zwischen den Kanten 22 und 24 des Formteiles 21 sind stärker vorgebogen als die beiden, den Rändern 2 und 3 benachbarten Flächen, da sie sich beim Zusammenbiegen stärker verformen. Ebenso ist der vorgeformte, von den Flächen eingeschlossene Winkel an der Längskante 23 größer als der Winkel an den Kanten 22 und 24. Die vierte Längskante wird von der Falzverbindung 1 gebildet.A molded part 21 shown in FIG. 2 can be bent into a tube with a rectangular cross-sectional shape. The longitudinal edges 22, 23 and 24 of the rectangular tube are preformed in the molded part 21. The surfaces can, as indicated by the dashed line, be pre-bent inwards, whereby flat surfaces are formed after the shaped part 21 has been bent together to form the tube. The two surfaces between the edges 22 and 24 of the molded part 21 are more pre-bent than the two surfaces adjacent to the edges 2 and 3, since they deform more when they are bent together. Likewise, the pre-formed angle enclosed by the surfaces on the longitudinal edge 23 is greater than the angle on the edges 22 and 24. The fourth longitudinal edge is the fold connection 1 formed.

Es ist auch eine Ausführungsform eines Formteiles für Rohre mit rechteckigem oder quadratischem Querschnitt möglich, bei der die Falzverbindung 1 im Bereich einer Wand des Rohres angeordnet ist (vgl. Fig. 12 und 12).An embodiment of a molded part for pipes with a rectangular or square cross section is also possible, in which the fold connection 1 is arranged in the region of a wall of the pipe (cf. FIGS. 12 and 12).

In Fig. 3 ist eine Falzverbindung 1 der zwei Längsränder 2 und 3 des zum Rohr geschlossenen Formteils 20 gezeigt. Am Längsrand 2 ist die schlaufenförmige Falzfaltung 8 ausgebildet, die im spitzen Winkel vom Längsrand 2 weg­ragt. Die Abkantung 9 am Längsrand 3 ist aus der Tangen­tialbene des Längsrandes 3 in einem mit der Falzfaltung 8 korrespondierenden, stumpfen Winkel ausgekantet (sh. Fig. 7). Die beiden Längsränder 2 und 3 stoßen entlang einer Fußlinie 4 aneinander. Um die Falzverbindung 1 ge­gen Auseinanderziehen zu sichern, wird die Falzfaltung 8 wellenförmig gebogen, wie dies in Fig. 4 dargestellt ist.In Fig. 3, a fold connection 1 of the two longitudinal edges 2 and 3 of the molded part 20 closed to the tube is shown. The loop-shaped fold fold 8 is formed on the longitudinal edge 2 and protrudes away from the longitudinal edge 2 at an acute angle. The bevel 9 on the longitudinal edge 3 is folded out from the tangential plane of the longitudinal edge 3 at an obtuse angle corresponding to the fold fold 8 (see FIG. 7). The two longitudinal edges 2 and 3 abut along a foot line 4. In order to secure the fold connection 1 against pulling apart, the fold fold 8 is bent in a wave shape, as shown in FIG. 4.

In den Fig. 5 und 6 ist eine andere Form der Sicherung der Falzverbindung 1 gegen Auseinanderziehen dargestellt. Die zur Falzverbindung 1 zusammengesteckte schlaufenför­mige Falzfaltung 8 am Längsrand 2 und die Abkantung 9 am Längsrand 3 sind quer zur Längsrichtung der Falzverbin­dung 1 durch Schnitte 7 unterteilt, so daß Abschnitte 5 und 6 entstehen, die abwechselnd in entgegengesetzte Richtungen umgebogen sind.5 and 6, another form of securing the fold connection 1 against pulling apart is shown. The loop-shaped fold fold 8 which is put together for the fold connection 1 and the bevel 9 on the longitudinal edge 3 are divided transversely to the longitudinal direction of the fold connection 1 by cuts 7, so that sections 5 and 6 are formed, which are alternately bent in opposite directions.

In Fig. 8 ist eine Falzverbindung, bestehend aus zwei Ab­kantungen 11 und 12 an den beiden Längsrändern 2 und 3 und einer U-förmigen Profilleiste 10 dargestellt. Die beiden Längsränder der Bauteile 2 und 3 werden mit ihren Abkantungen 11 und 12 flach aneinandergelegt und an­schließend wird die U-förmige Profilleiste 10 darüberge­schoben. Zum Sichern der Falzverbindung kann diese, wie in den Fig. 3 und 4 dargestellt, verbogen werden. Die Si­cherung der Falzverbindung gemäß Fig. 8 kann auch wie in Fig. 5 und 6 ausgeführt sein, wobei die Schnitte 7 im Ab­ stand von den freien Längsrändern der Profilleiste 10 en­den.In Fig. 8 a fold connection, consisting of two bevels 11 and 12 on the two longitudinal edges 2 and 3 and a U-shaped profile strip 10 is shown. The two longitudinal edges of components 2 and 3 are placed flat against one another with their bevels 11 and 12 and then the U-shaped profile strip 10 is pushed over it. To secure the fold connection, it can be bent, as shown in FIGS. 3 and 4. 8 can also be carried out as in FIGS. 5 and 6, the cuts 7 in FIG stood from the free longitudinal edges of the profile strip 10 ends.

In Fig. 9 ist ein aus aus erfindungsgemäßen Formteilen hergestellten Rohrstücken zusammengesetztes Luftrohrsy­stem dargestellt.9 shows an air pipe system composed of pipe pieces produced from molded parts according to the invention.

Die Rohrstücke 26 sind aus einem in Fig. 10 dargestellten Blechzuschnitt 29 hergestellt. Die Schnittkanten 27 und 28 sind dabei so gelegt, daß die Bäuche und Täler der Wellen, welche die Schnittkante bilden, einander jeweils gegenüberliegen. Aus den dabei entstehenden Blechzu­schnitten 29 werden zu Rohrstücken 26 mit in zur Rohrach­se schrägen Ebenen liegenden Enden geformt.The pipe sections 26 are produced from a sheet metal blank 29 shown in FIG. 10. The cut edges 27 and 28 are placed so that the bellies and valleys of the waves that form the cut edge are opposite each other. From the resulting sheet metal blanks 29 are formed into tube pieces 26 with ends lying in planes inclined to the tube axis.

In Fig. 11 ist ein Blechzuschnitt 29 zur Herstellung von Rohrstücken mit rechteckiger Querschnittsform darge­stellt, wobei die Enden der Rohrstücke in zur Achse der Rohrstücke schrägen Ebenen liegen. Die Schnittkanten 27 verlaufen hier entsprechend dem rechteckigen Profil ge­radlinig und abschnittweise abgewinkelt. Für die Herstel­lung von Formteilen für die Herstellung von Rohren mit anderen polygonalen Querschnitten werden sinngemäße Schnittführungen angewendet.FIG. 11 shows a sheet metal blank 29 for the production of tubular pieces with a rectangular cross-sectional shape, the ends of the tubular pieces lying in planes which are inclined to the axis of the tubular pieces. The cut edges 27 here run in a straight line and angled in sections in accordance with the rectangular profile. For the manufacture of molded parts for the manufacture of pipes with other polygonal cross sections, appropriate cut guides are used.

Ein in Fig. 12 dargestellter Formteil 31 dient zur Her­stellung eines Rohres mit rechteckförmigem Querschnitt, das in Fig. 13 gezeigt ist. Die Falzverbindung 41 befin­det sich in der Mitte einer der Flächen, die sich aus den Teilflächen 34 und 36 zusammensetzt, und ist versenkt an­geordnet.A shaped part 31 shown in FIG. 12 is used to produce a tube with a rectangular cross section, which is shown in FIG. 13. The fold connection 41 is located in the middle of one of the surfaces, which is composed of the partial surfaces 34 and 36, and is arranged sunk.

Die Flächen 32 bis 36 sind vorgebogen, wobei die Fläche 32 am stärksten, die Flächen 33 und 35 weniger und die Teilflächen 34 und 36 am wenigsten vorgebogen sind. Die runden Kanten 37, 38, 39 und 40 sind im Formteil 31 eben­falls bereits vorgebogen, wobei die Längskanten 39 und 40 stärker vorgebogen sind als die Längskanten 37 und 38.The surfaces 32 to 36 are pre-bent, the surface 32 being the strongest, the surfaces 33 and 35 less and the partial surfaces 34 and 36 being the least pre-bent. The round edges 37, 38, 39 and 40 are also already pre-bent in the molded part 31, the longitudinal edges 39 and 40 being more pre-bent than the longitudinal edges 37 and 38.

Nach dem Zusammenbiegen des Formteils 31 und Schließen der Falzverbindung 41 entsteht das in Fig. 13 dargestell­te Rohr mit ebenen Flächen 32 bis 36 und gleich runden Längsrändern 37 bis 40.After the shaped part 31 has been bent together and the fold connection 41 has been closed, the tube shown in FIG. 13 with flat surfaces 32 to 36 and equally round longitudinal edges 37 to 40 is produced.

Die erfindungsgemäßen Formteile eignen sich besonders für die Herstellung von Brennkammerrohren und für dünnwandige Rohre. Als Werkstoff für den Formteil kann neben Blech aus Metall jeder andere flächige Werkstoff verwendet wer­den, so auch Schichtwerkstoffe, wie kunststoffbeschichte­te Metallbleche.The molded parts according to the invention are particularly suitable for the production of combustion chamber tubes and for thin-walled tubes. In addition to sheet metal made of metal, any other flat material can be used as the material for the molded part, including layered materials such as plastic-coated metal sheets.

Claims (14)

1. Formteil aus flächigem Werkstoff zur Herstellung von rohrförmigen Teilen mit Längsnaht, in der die paral­lel zur Achse des Rohres verlaufenden Ränder des Formteils durch eine Schließvorrichtung, insbesondere Falzfaltung miteinander verbunden sind, wobei der Formteil durch elastisches Verformen zu dem Rohr bzw. Rohrstück schließbar ist, dadurch gekennzeichnet, daß der Formteil (20, 21, 29) parallel zur Richtung der Achse des aus dem Formteil (20, 21) herzustellenden Rohres bzw. Rohrstückes gebogen bzw. gekantet ist, wobei die beiden die Naht bildenden Längsränder (2, 3) des Formteils (20, 21, 29) im entspannten Zustand desselben einen Abstand voneinander aufweisen, der das Einlegen eines weiteren Formteils (20, 21, 29) gestattet, und daß die Querschnittsform des Formteils (20, 21, 29) im entspannten Zustand desselben einen Verlauf besitzt, der unter der Einwirkung der im zum rohrförmigen Teil verformten Formteil auf diesen durch die Schließvorrichtung einwirkenden Kräfte und Momente der gewünschten Querschnittsform des rohrför­migen Teils (20, 21, 29) entspricht.1. Shaped part made of sheet material for the production of tubular parts with a longitudinal seam, in which the edges of the shaped part running parallel to the axis of the pipe are connected to one another by a closing device, in particular folded folds, the shaped part being closable by elastic deformation to form the pipe or piece of pipe characterized in that the shaped part (20, 21, 29) is bent or folded parallel to the direction of the axis of the pipe or pipe piece to be produced from the shaped part (20, 21), the two longitudinal edges (2, 3 ) of the molded part (20, 21, 29) in the relaxed state of the same have a distance from one another which allows the insertion of a further molded part (20, 21, 29), and that the cross-sectional shape of the molded part (20, 21, 29) in the relaxed state it has a course which, under the action of the shaped part deformed in the tubular part, acts on it by the locking device times and moments of the desired cross-sectional shape of the tubular part (20, 21, 29) corresponds. 2. Formteil nach Anspruch 1, dadurch gekennzeichnet, daß der Formteil zur Herstellung von Rohren bzw. Rohr­stücken mit kreisförmiger oder ovaler Querschnitts­form in seinem Mittelbereich zwischen den Längsrän­dern (2, 3) weniger stark vorgebogen ist als im Be­reich seiner Längsränder (2, 3).2. Shaped part according to claim 1, characterized in that the shaped part for the production of pipes or pipe pieces with a circular or oval cross-sectional shape in its central region between the longitudinal edges (2, 3) is less pre-bent than in the region of its longitudinal edges (2, 3) . 3. Formteil nach Anspruch 1, dadurch gekennzeichnet, daß der Formteil zur Herstellung von Rohren bzw. Rohr­stücken mit polygonaler, insbesondere rechteckiger Querschnittsform die im zum Rohr bzw. Rohrstück ge­schlossenen Zustand des Formteiles ebenen Flächen (32, 33, 34, 35, 36) gegen die Biegerichtung vorgebo­gen sind.3. Shaped part according to claim 1, characterized in that the shaped part for the production of pipes or pipe pieces with a polygonal, in particular rectangular cross-sectional shape, the flat surfaces (32, 33, 34, 35, 36) when the shaped part is closed to the pipe or pipe piece. are pre-bent against the bending direction. 4. Formteil nach Anspruch 3, dadurch gekennzeichnet, daß die Flächen (32) im Mittelbereich zwischen den Längs­rändern (2, 3) stärker vorgebogen sind als die Flä­chen (33, 35) im Bereich der Längsränder (2, 3), und daß die von den Flächen (32, 33, 34, 35, 36) einge­schlossenen Winkel der Längskanten (37, 38, 39, 40) im Mittelbereich größer sind als im Bereich der Längskanten (2, 3).4. Molding according to claim 3, characterized in that the surfaces (32) in the central region between the longitudinal edges (2, 3) are more pre-bent than the surfaces (33, 35) in the region of the longitudinal edges (2, 3), and that angles of the longitudinal edges (37, 38, 39, 40) enclosed by the surfaces (32, 33, 34, 35, 36) are larger in the central region than in the region of the longitudinal edges (2, 3). 5. Formteil nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Blechzuschnitt, aus dem der Formteil (20, 21) gebogen ist, im wesentlichen die Form eines Rechtecks aufweist.5. Shaped part according to one of claims 1 to 4, characterized in that the sheet metal blank from which the shaped part (20, 21) is bent has essentially the shape of a rectangle. 6. Formteil nach einem der Ansprüche 1 bis 4 zur Her­stellung von Rohrstücken (26) mit rundem Querschnitt und mit in zur Rohrachse schrägen Ebenen liegenden Enden, dadurch gekennzeichnet, daß die Kanten des Formteiles (29) zwischen den zur achsparallelen Naht zu verbindenden Rändern (28) eine gewellte Kontur aufweisen, wobei Bäuche und Täler der Wellen einander jeweils gegenüberliegen.6. Molding according to one of claims 1 to 4 for the production of pipe sections (26) with a round cross-section and with ends lying in planes inclined to the pipe axis, characterized in that the edges of the molded part (29) between the edges to be joined to the axis-parallel seam ( 28) have a corrugated contour, the bellies and valleys of the waves being opposite each other. 7. Formteil nach einem der Ansprüche 1 bis 4 zur Her­stellung von Rohrstücken mit polygonalem, z.B. qua­dratischem oder rechteckigem Querschnitt und mit in zur Rohrachse schrägen Ebenen liegenden Enden, da­durch gekennzeichnet, daß die Kanten (27) des Form­teiles (29) zwischen den zur achsparallelen Naht zu verbindenden Rändern (28) eine gewinkelte Kontur mit vor- und rückspringenden Abschnitten aufweisen, wobei die rückspringenden und die vorspringenden Abschnitte einander jeweils gegenüberliegen.7. Molding according to one of claims 1 to 4 for the production of pipe pieces with polygonal, e.g. square or rectangular cross-section and with ends lying in planes inclined to the tube axis, characterized in that the edges (27) of the molded part (29) have an angled contour with protruding and recessed sections between the edges (28) to be joined to the axis-parallel seam, the recessed and projecting portions being opposite to each other. 8. Formteil nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die unter Bildung einer Falzfal­tung (1) zur Naht des Rohres bzw. Rohrstückes zu ver­bindenden Längsränder (2, 3) des Formteils (20, 21, 29) abgekantet sind.8. Shaped part according to one of claims 1 to 7, characterized in that the longitudinal edges (2, 3) of the shaped part (20, 21) to be joined to form the seam of the tube or tube piece, with the formation of a fold fold (1). 29) are folded. 9. Formteil nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß einer der miteinander zu verbin­denden Ränder (2, 3) des Formteiles (20, 21, 29) wie an sich bekannt, nach außen abgekantet (9) ist, daß der gegenüberliegende Rand zu einer an sich bekannten schlaufenartigen Falzfaltung (8) geformt ist, in den die Abkantung (9) einführbar ist, daß die Abkantung (9) mit dem Formteil (20, 21, 29) einen stumpfen Win­kel einschließt und daß die Mittelebene der schlau­fenartigen Falzfaltung (8) mit der Ebene des Formtei­les (20, 21, 29) einen spitzen Winkel einschließt, wobei sich die beiden Winkel zueinander auf 180° er­gänzen.9. Molding according to one of claims 1 to 8, characterized in that one of the edges (2, 3) of the molding (20, 21, 29) to be connected to one another, as is known per se, is folded outwards (9) that the opposite edge is formed into a known loop-like fold fold (8) into which the fold (9) can be inserted, that the fold (9) with the molded part (20, 21, 29) encloses an obtuse angle and that the central plane of the loop-like fold fold (8) with the plane of the molded part (20, 21, 29) encloses an acute angle, the two angles complementing each other at 180 °. 10. Formteil nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß an beiden zur Naht zu verbinden­den Längsrändern (2, 3) des Formteiles zur Ebene des Formteiles im wesentlichen senkrecht stehende Abkan­tungen (11, 12) angeordnet sind, und daß über die beiden aneinander anliegenden Abkantungen (11, 12) eine diese aneinanderpressende und in sich aufneh­mende, im wesentlichen U-Förmige Blechprofilleiste (10) schiebbar ist.10. Shaped part according to one of claims 1 to 7, characterized in that on both longitudinal edges to be connected to the seam (2, 3) of the shaped part to the plane of the shaped part substantially perpendicular bevels (11, 12) are arranged, and that over the two mutually abutting bevels (11, 12), a substantially U-shaped sheet-metal profile strip (10) which presses them into one another and accommodates them. 11. Rohr oder Rohrstück, hergestellt aus einem der Form­teile nach einem der Ansprüche 1 bis 10, dadurch ge­kennzeichnet, daß der nach außen weisende Falzfaltung der Naht form- und/oder kraftschlüssig gesichert ist.11. Pipe or piece of pipe, made from one of the molded parts according to one of claims 1 to 10, characterized in that the outwardly facing fold fold of the seam is secured positively and / or non-positively. 12. Rohr nach Anspruch 11, dadurch gekennzeichnet, daß zur formschlüssigen Sicherung der Falzfaltung (1) die vom Rohr nach außen abstehenden Teile der Naht ab­wechselnd in die eine und in die andere Richtung um­gebogen sind.12. Pipe according to claim 11, characterized in that for positive locking of the folded fold (1), the parts of the seam projecting outwards from the tube are bent alternately in one direction and in the other direction. 13. Rohr nach Anspruch 12, dadurch gekennzeichnet, daß die freie Randkante der Falzfaltung (1) wellenförmig verläuft (Fig. 3, 4).13. Pipe according to claim 12, characterized in that the free edge of the fold (1) is wavy (Fig. 3, 4). 14. Rohr nach Anspruch 11, dadurch gekennzeichnet, daß in der nach außen stehenden Falzfaltung (1) im Abstand voneinander Einschnitte (7) vorgesehen sind und daß die zwischen den Einschnitten (7) angeordneten Ab­schnitte (5, 6) des Falzes (1) abwechselnd nach der einen und nach der anderen Richtung umgebogen sind.14. Pipe according to claim 11, characterized in that incisions (7) are provided at a distance from each other in the folded fold (1) and that the sections (5, 6) of the fold (1) arranged between the incisions (7) are alternately bent in one direction and the other.
EP90890108A 1989-04-24 1990-04-09 Preformed part for manufacture of tubular parts with longitudinal seam and tube made therefrom Expired - Lifetime EP0395626B1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CS903489A CS348990A2 (en) 1989-11-20 1990-07-13 Profile element for tubular parts production with longitudinal seam and a tube manufactured of it, if need be, a part of tube and longitudinal welted joint
YU137190A YU137190A (en) 1989-11-20 1990-07-13 DESIGNER FOR MANUFACTURE OF TUBULAR PARTS WITH LONGITUDINAL JOINT AND PIPE MADE OF IT OZ. PIPE PART AS WELL AS A LONGITUDINAL JOINT
HU419690A HU208646B (en) 1989-11-20 1990-07-13 Intermediate product for producing tube shapes and tube shape formed from such intermediate product and folded bond formed for these
SU4830522 RU2026123C1 (en) 1989-11-20 1990-07-13 Complex blank, finished pipe or length thereof made from the blank and closed longitudinal seam
PL28609690A PL286096A1 (en) 1989-11-20 1990-07-16 Blank for making seamed tubular components, tube or shaped tube union made of such blank and groover joint used as longitudinal seam of tubular made of such blank

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0097789A AT392026B (en) 1989-04-24 1989-04-24 MOLDED PART FOR THE PRODUCTION OF PIPE-SHAPED PARTS WITH LENGTH SEED AND TUBE MADE THEREOF, OR PIPE
AT977/89 1989-04-24

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EP0395626A1 true EP0395626A1 (en) 1990-10-31
EP0395626B1 EP0395626B1 (en) 1992-09-23

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EP90890108A Expired - Lifetime EP0395626B1 (en) 1989-04-24 1990-04-09 Preformed part for manufacture of tubular parts with longitudinal seam and tube made therefrom

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AT (2) AT392026B (en)
DE (1) DE59000313D1 (en)

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Title
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SOVIET INVENTIONS ILLUSTRATED, CH Sektion, Woche D12, 29. April 1981 DERWENT PUBLICATIONS LTD., M 23 P 51 & SU-A-747 559 ( ELEKTROSTAL STEEL ) *
SOVIET INVENTIONS ILLUSTRATED, PQ Sektion, Woche C29, 27. August 1980 DERWENT PUBLICATIONS LTD., P 52 & SU-A-700 230 ( MAGN. METAL COMB.) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT52U3 (en) * 1994-07-14 1995-03-27 Bertrams Kg Bertrams Kg METHOD FOR PRODUCING A METAL METAL METHOD FOR PRODUCING AN ADJUSTABLE PIPE KLEE, THE ADJUSTABLE PIPE KNEE
EP1121992A3 (en) * 2000-02-04 2002-04-17 Ricoh Company, Ltd. Method of manufacturing pipe body and pipe body manufactured by the method
US6601427B2 (en) 2000-02-04 2003-08-05 Ricoh Company, Ltd. Method of manufacturing pipe body and pipe body manufactured by the method
US6983770B2 (en) * 2000-02-04 2006-01-10 Ricoh Company, Ltd. Method of manufacturing pipe body and pipe body manufactured by the method

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ATE80815T1 (en) 1992-10-15
AT392026B (en) 1991-01-10
EP0395626B1 (en) 1992-09-23
ATA97789A (en) 1990-07-15
DE59000313D1 (en) 1992-10-29

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