EP0512426A1 - Method and device for making threads on polygonal tubes - Google Patents

Method and device for making threads on polygonal tubes Download PDF

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Publication number
EP0512426A1
EP0512426A1 EP92107427A EP92107427A EP0512426A1 EP 0512426 A1 EP0512426 A1 EP 0512426A1 EP 92107427 A EP92107427 A EP 92107427A EP 92107427 A EP92107427 A EP 92107427A EP 0512426 A1 EP0512426 A1 EP 0512426A1
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EP
European Patent Office
Prior art keywords
polygonal tube
tube
expanding claw
polygonal
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
EP92107427A
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German (de)
French (fr)
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EP0512426B1 (en
Inventor
Artur Dipl.-Ing. Schwörer (FH)
Werner Dipl.-Ing. Handvest
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Peri GmbH
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Peri GmbH
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Publication of EP0512426A1 publication Critical patent/EP0512426A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D15/00Corrugating tubes
    • B21D15/04Corrugating tubes transversely, e.g. helically

Definitions

  • the invention relates first of all to a method for applying thread pulls to the edges of a polygonal tube. Because of the angular cross-section of the tube, the thread can not be applied by rolling the thread, so that so far the thread cutting, for. B. were cut by a cutting clip. With a polygonal cross-section of the pipes and thus a flat edge angle and corresponding wall thickness of the pipes, this poses few problems. It If there are segments of a thread in the area of the edges, the middle area of the flat side walls is free of threads.
  • the polygonal tube has few edges - for example 5, 4 or 3 edges - the thread segments must be cut relatively deep at the edges in order to give a sufficiently deep engagement in the longitudinal direction of the threaded connections for a threaded nut engaging in the threaded connections.
  • the wall in the thread base becomes very thin, possibly the wall breaks completely in the area of the edge, so that a hole is created in the thread base.
  • the object of the invention is to improve threaded segments arranged in the area of the edges of polygonal tubes.
  • this object is first achieved in that the tube is deformed without cutting.
  • an expanding claw the outer surface of which has the inner contour of a section of the thread segments to be produced, is clamped as a lower tool from the inside against the wall of the polygonal tube.
  • at least one outer tool which has the outer contour of a section of the thread segments to be produced, is pressed in the area of the expanding claw from the outside against the edge of the polygonal tube, so that the material of the tube wall in the area of the edges enters depressions forming the thread base in the outer surface of the expanding claw .
  • the outer tool and the expanding claw are then lifted off the tube walls and the polygonal tube is displaced axially by one pitch or a multiple thereof relative to the outer tool and the expanding claw by a machining section.
  • This method has the advantage that the wall of the polygonal tube is weakened only slightly or not at all in the thread base. Due to the deformation with the external tool and the expanding claw, this wall section is additionally solidified, breaking through the wall in the area of the thread base is avoided with certainty.
  • the thickness of the wall thickness remaining in the area of the thread base after the deformation depends on the distance between the elevations of the outer tool that form the thread base and the depressions forming the thread base at the end of the deformation in the expanding claw that serves as the counter tool. It is therefore possible with the method according to the invention not only to produce thread segments in which the wall thickness in the region of the thread base corresponds to the wall thickness of the polygonal tube in the region of the flat side walls, but also in thread segments in which this wall thickness is smaller, but may also be somewhat thicker, when the material of the polygonal tube reaches the flow limit during the deformation.
  • the invention further relates to a device for performing the method, which is characterized in that it has a tensioning device for the polygonal tube and an expanding claw, at least one of these parts being displaceably guided parallel to the axis of the polygonal tube, and in that the expanding claw into the Polygonal tube can be inserted and expanded into a position adjacent to the inner wall of the polygonal tube and can also be folded into a position in which the outer contour of the expanding claw has smaller outer dimensions than the corresponding inner dimensions of the polygonal tube in the area of the threaded segments.
  • an expanding claw as a counter-tool for deforming the polygonal tube results in a simple construction of the device, since the expanding claw is designed such that it is supported against the inner surfaces of the polygonal tube during the deformation.
  • the outer contour of the expanding claw can have the internal dimensions of the polygonal tube in the expanded position, with recesses being provided on all edges of the expanding claw for receiving the thread pulls.
  • the expanding claw is designed such that its edges, which are not required as a counter-tool for the external tool, are round or flattened.
  • the outer contour of the expanding claw can be supported at several points on the inner surfaces of the polygonal tube. In one embodiment of the invention, however, the expanding claw is supported only at the point on the inner surfaces opposite the deformed edge. In this case, it is sufficient if the expanding claw has an expanding part which is pivotably attached to an extension of a rod, the extension of the rod being supported during the expansion at the point on the inner surfaces of the polygonal tube opposite the deformation region.
  • Embodiments of the expanding claw can, however, also have a plurality of pivotably mounted expanding parts, one or two of which form the counter-tool to the external tool, whereas the other expanding parts are used to support the expanding claw on the inner surfaces of the polygonal tube.
  • the spreading claw can be spread out by various devices, for example the spreading members can be spread by compressed air or a hydraulic medium.
  • the spreading members can be spread by compressed air or a hydraulic medium.
  • only two expansion parts are provided, which are separated by a mechanical device, namely a spreading cone to be spread.
  • the expansion cone is fastened to an actuating rod which is passed through the hollow cross section of a rod carrying the expanding claw and is driven at its rear end to perform a displacement movement.
  • This device for spreading the expanding claw allows a very simple and robust construction.
  • the invention further relates to a threaded tube which is designed as a polygonal tube, for example as a square tube and has segments of a thread along its edges, the wall thickness in the thread base being essentially the same as in the region of the side walls.
  • a threaded pipe is particularly suitable for use in the construction industry for ceiling or other supports or formwork clamps. Contaminants that settle in the thread segments in the area of the edges are pressed when a threaded nut is screwed out of the thread into the space between the round inner surface of the threaded nut and the flat side surfaces of the polygonal tube, in particular a square tube. This self-cleaning of the thread is ensured in particular because there is no breakthrough to the interior of the polygonal tube that holds the contamination in the thread base of the threaded segments, but the wall thickness of the polygonal tube is generally almost preserved at this point.
  • a carriage 1 is guided in a longitudinally displaceable manner on a base frame 2.
  • the displacement movement is driven by a hydraulic or pneumatic feed device 3.
  • a clamping device 4 for a square tube 5 is rigidly attached.
  • the tensioning device 4 is indicated schematically by a device 6 having a cylinder and a piston.
  • a plate 7 is also attached to which a support tube 8 is attached.
  • a support tube 8 is attached.
  • two expansion parts 10, 11 are pivotally mounted about an axis 9.
  • a rod 13 driven by an actuating device 12 is slidably guided, which carries an expansion cone 14 at its front end.
  • the expansion parts 10, 11 have a cross section which is designed such that the outer surfaces of the expanded expansion parts 10, 11 lie against the square tube 5 from the inside in the region of the edges.
  • the embodiment shown has two external tools 15, 16, which on two opposite edges of the Square tube 5 can act and are formed on its end face so that segments of a thread are formed in the region of these opposite edges of the square tube 5.
  • the expanding parts 10, 11 located inside the square tube 5 in the area of the external tools 15, 16 serve as counter tools for the external tools 15, 16.
  • the outer surface of the expanding parts 10, 11 has a corresponding profile, which the male to the End faces of the external tools 15, 16 acting as a die.
  • the carriage 1 is driven by a further, schematically indicated, device 17 which, in cooperation with a catch bar 18, advances the carriage 1 step by step.
  • the square tube 5 clamped in the clamping device 4 is pushed by the feed device 3 in the axial direction of the square tube 5 over an expansion claw consisting of the expansion parts 10, 11 and the expansion cone 14, which between the external tools 15, 16 are held in their position unchangeable by the rod 8.
  • the expansion parts 10, 11 are then spread out by pulling back the expansion cone 14 with the aid of the actuating device 12, so that they lie against the inner surfaces of the square tube 5 in the region of two mutually opposite edges.
  • the expanding claw 10, 11, 14, as a relatively rigid counter-tool absorbs the pressure of the two external tools 15, 16 which are moved relative to one another.
  • the material of the wall of the square tube 5 occurs in the deformation in depressions on the outer surfaces of the expansion parts 10, 11, so that in Thread base of the thread segments the wall thickness is approximately preserved.
  • the device 17 shifts the slide 1 by one machining section until a sensor 23 switches off the drive by falling into the next catch of the catch bar 18. Then the next processing section of the square tube 5 is provided with threaded segments.
  • the square tube 5 is rotated in the clamping device 4 by 90 °, so that 5 thread segments can be formed on the other two edges of the square tube.
  • a compression coil spring 20 is supported on a flange 19 of the rod 8, the other end of which presses a disk 21 against inclined surfaces 22 of the expansion parts 10, 11 and returns it to its rest position when the expansion cone 14 is pushed away from the expansion parts 10, 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Clamps And Clips (AREA)
  • Joints With Pressure Members (AREA)
  • Spinning Or Twisting Of Yarns (AREA)

Abstract

The invention relates to a method for making threads on the edges of a polygonal tube (5). It consists in that the polygonal tube (5) is deformed without cutting by a process in which an expanding claw (10, 11, 14), the outer surface of which has the inner contour of a section of the thread segments to be produced, is first of all clamped from inside as a bottom tool against the wall of the polygonal tube, at least one outer tool (15, 16), which has the outer contour of a section of the thread segments to be produced, is then pressed against the edge of the polygonal tube (5) from outside in the region of the expanding claw (10, 11, 14), with the result that the material of the wall of the polygonal tube (5) enters the recesses in the outer surface of the expanding claw (10, 11, 14) in the region of the edges, the outer tool (15, 16) and the expanding claw (10, 11, 14) are lifted away from the walls of the tube after the deformation process, and the polygonal tube (5) is then displaced axially relative to the outer tool (15, 16) and the expanding claw (10, 11, 14) by one section to be processed, by the pitch or a multiple thereof. <IMAGE>

Description

Die Erfindung bezieht sich zunächst auf ein Verfahren zum Anbringen von Gewindezügen auf Kanten eines Mehrkantrohres. Wegen dem eckigen Querschnitt des Rohres können die Gewindezüge nicht durch Einrollen des Gewindes aufgebracht werden, so daß bisher bei Mehrkantrohren die Gewinde spanabhebend, z. B. durch eine Schneidkluppe eingeschnitten wurden. Dies bringt bei vieleckigem Querschnitt der Rohre und damit flachem Kantenwinkel und entsprechender Wandstärke der Rohre wenig Probleme. Es befinden sich Segmente eines Gewindes im Bereich der Kanten, der mittlere Bereich der ebenen Seitenwände ist frei von Gewindezügen. Hat das Mehrkantrohr jedoch wenig Kanten - beispielsweise 5, 4 oder 3 Kanten-, so müssen die Gewindesegmente an den Kanten verhältnismäßig tief eingeschnitten werden, um einer in die Gewindezüge eingreifenden Gewindemutter einen ausreichend tiefen und in Längsrichtung der Gewindezüge ausreichenden Eingriff zu geben. Dadurch wird die Wand im Gewindegrund sehr dünn, möglicherweise bricht im Bereich der Kante die Wand ganz durch, so daß im Gewindegrund jeweils ein Loch entsteht.The invention relates first of all to a method for applying thread pulls to the edges of a polygonal tube. Because of the angular cross-section of the tube, the thread can not be applied by rolling the thread, so that so far the thread cutting, for. B. were cut by a cutting clip. With a polygonal cross-section of the pipes and thus a flat edge angle and corresponding wall thickness of the pipes, this poses few problems. It If there are segments of a thread in the area of the edges, the middle area of the flat side walls is free of threads. However, if the polygonal tube has few edges - for example 5, 4 or 3 edges - the thread segments must be cut relatively deep at the edges in order to give a sufficiently deep engagement in the longitudinal direction of the threaded connections for a threaded nut engaging in the threaded connections. As a result, the wall in the thread base becomes very thin, possibly the wall breaks completely in the area of the edge, so that a hole is created in the thread base.

Der Erfindung liegt die Aufgabe zugrunde, im Bereich der Kanten von Mehrkantrohren angeordnete Gewindesegmente zu verbessern.The object of the invention is to improve threaded segments arranged in the area of the edges of polygonal tubes.

Gemäß der Erfindung wird diese Aufgabe zunächst dadurch gelöst, daß das Rohr spanlos verformt wird. Dabei wird zunächst eine Spreizklaue, deren Außenfläche die Innenkontur eines Abschnittes der herzustellenden Gewindesegmente aufweist, als Unterwerkzeug von innen gegen die Wand des Mehrkantrohres gespannt. Anschließend wird mindestens ein Außenwerkzeug, das die Außenkontur eines Abschnittes der herzustellenden Gewindesegmente aufweist, im Bereich der Spreizklaue von außen gegen die Kante des Mehrkantrohres gepreßt, so daß der Werkstoff der Rohrwand im Bereich der Kanten in den Gewindegrund formende Vertiefungen in der Außenfläche der Spreizklaue eintritt. Danach werden Außenwerkzeug und Spreizklaue von den Rohrwandungen abgehoben und das Mehrkantrohr relativ zu Außenwerkzeug und Spreizklaue um die Steigung oder ein Mehrfaches davon axial um einen Bearbeitungsabschnitt verschoben.According to the invention, this object is first achieved in that the tube is deformed without cutting. First, an expanding claw, the outer surface of which has the inner contour of a section of the thread segments to be produced, is clamped as a lower tool from the inside against the wall of the polygonal tube. Subsequently, at least one outer tool, which has the outer contour of a section of the thread segments to be produced, is pressed in the area of the expanding claw from the outside against the edge of the polygonal tube, so that the material of the tube wall in the area of the edges enters depressions forming the thread base in the outer surface of the expanding claw . The outer tool and the expanding claw are then lifted off the tube walls and the polygonal tube is displaced axially by one pitch or a multiple thereof relative to the outer tool and the expanding claw by a machining section.

Dieses Verfahren hat den Vorzug, daß die Wand des Mehrkantrohres im Gewindegrund nur wenig oder gar nicht geschwächt wird. Durch die Verformung mit Außenwerkzeug und Spreizklaue wird dieser Wandabschnitt zusätzlich verfestigt, ein Durchbrechen der Wand im Bereich des Gewindegrundes wird mit Sicherheit vermieden.This method has the advantage that the wall of the polygonal tube is weakened only slightly or not at all in the thread base. Due to the deformation with the external tool and the expanding claw, this wall section is additionally solidified, breaking through the wall in the area of the thread base is avoided with certainty.

Die Dicke der im Bereich des Gewindegrundes nach der Verformung stehen gebliebene Wandstärke hängt davon ab, welchen Abstand den Gewindegrund formende Erhebungen des Außenwerkzeugs am Ende der Verformung von den Gewindegrund formenden Vertiefungen in der als Gegenwerkzeug dienenden Spreizklaue aufweisen. Es können daher mit dem erfindungsgemäßen Verfahren nicht nur Gewindesegmente hergestellt werden, bei denen die Wandstärke im Bereich des Gewindegrundes der Wandstärke des Mehrkantrohres im Bereich der ebenen Seitenwände entspricht, sondern auch Gewindesegmente, bei denen diese Wandstärke geringer ist, möglicherweise aber auch etwas dicker ist, wenn beim Verformen das Material des Mehrkantrohres die Fließgrenze erreicht.The thickness of the wall thickness remaining in the area of the thread base after the deformation depends on the distance between the elevations of the outer tool that form the thread base and the depressions forming the thread base at the end of the deformation in the expanding claw that serves as the counter tool. It is therefore possible with the method according to the invention not only to produce thread segments in which the wall thickness in the region of the thread base corresponds to the wall thickness of the polygonal tube in the region of the flat side walls, but also in thread segments in which this wall thickness is smaller, but may also be somewhat thicker, when the material of the polygonal tube reaches the flow limit during the deformation.

Die Erfindung bezieht sich weiter auf eine Vorrichtung zur Durchführung des Verfahrens, die dadurch gekennzeichnet ist, daß sie eine Spannvorrichtung für das Mehrkantrohr und eine Spreizklaue aufweist, wobei mindestens eines dieser Teile parallel zur Achse des Mehrkantrohres verschiebbar geführt ist, und daß die Spreizklaue in das Mehrkantrohr einführbar und in eine an die Innenwand des Mehrkantrohres anliegende Stellung aufspreizbar ist und außerdem in eine Stellung zusammenlegbar ist, in der die Außenkontur der Spreizklaue kleinere Außenabmessungen als die entsprechenden Innenabmessungen des Mehrkantrohres im Bereich der Gewindesegmente aufweist.The invention further relates to a device for performing the method, which is characterized in that it has a tensioning device for the polygonal tube and an expanding claw, at least one of these parts being displaceably guided parallel to the axis of the polygonal tube, and in that the expanding claw into the Polygonal tube can be inserted and expanded into a position adjacent to the inner wall of the polygonal tube and can also be folded into a position in which the outer contour of the expanding claw has smaller outer dimensions than the corresponding inner dimensions of the polygonal tube in the area of the threaded segments.

Die Verwendung einer Spreizklaue als Gegenwerkzeug zum Verformen des Mehrkantrohrs ergibt einen einfachen Aufbau der Vorrichtung, da die Spreizklaue so ausgebildet ist, daß sie sich während der Verformung gegen die Innenflächen des Mehrkantrohres abstützt. Dabei kann die Außenkontur der Spreizklaue in aufgespreizter Stellung die Innenabmessungen des Mehrkantrohres aufweisen, wobei dann an allen Kanten der Spreizklaue Vertiefungen zur Aufnahme der Gewindezüge vorgesehen sind. Bei anderen Ausführungsformen der Erfindung ist die Spreizklaue so ausgebildet, daß ihre nicht als Gegenwerkzeug für das Außenwerkzeug benötigten Kanten rund oder abgeflacht sind.The use of an expanding claw as a counter-tool for deforming the polygonal tube results in a simple construction of the device, since the expanding claw is designed such that it is supported against the inner surfaces of the polygonal tube during the deformation. In this case, the outer contour of the expanding claw can have the internal dimensions of the polygonal tube in the expanded position, with recesses being provided on all edges of the expanding claw for receiving the thread pulls. In other embodiments of the invention, the expanding claw is designed such that its edges, which are not required as a counter-tool for the external tool, are round or flattened.

Die Außenkontur der Spreizklaue kann sich an mehreren Stellen der Innenflächen des Mehrkantrohres abstützen. Bei einer Ausführungsform der Erfindung stützt sich die Spreizklaue jedoch nur an der der verformten Kante gegenüberliegenden Stelle der Innenflächen ab. In diesem Falle genügt es, wenn die Spreizklaue ein Spreizteil aufweist, das an einer Verlängerung eines Stabes schwenkbar befestigt ist, wobei sich die Verlängerung des Stabes beim Aufspreizen an der dem Verformungsbereich gegenüberliegenden Stelle der Innenflächen des Mehrkantrohres abstützt. Ausführungsformen der Spreizklaue können jedoch auch mehrere schwenkbar gelagerte Spreizteile aufweisen, von denen eines oder zwei das Gegenwerkzeug zu dem Außenwerkzeug bilden, wogegen die anderen Spreizteile zum Abstützen der Spreizklaue an den Innenflächen des Mehrkantrohres benutzt werden.The outer contour of the expanding claw can be supported at several points on the inner surfaces of the polygonal tube. In one embodiment of the invention, however, the expanding claw is supported only at the point on the inner surfaces opposite the deformed edge. In this case, it is sufficient if the expanding claw has an expanding part which is pivotably attached to an extension of a rod, the extension of the rod being supported during the expansion at the point on the inner surfaces of the polygonal tube opposite the deformation region. Embodiments of the expanding claw can, however, also have a plurality of pivotably mounted expanding parts, one or two of which form the counter-tool to the external tool, whereas the other expanding parts are used to support the expanding claw on the inner surfaces of the polygonal tube.

Das Aufspreizen der Spreizklaue kann durch verschiedene Vorrichtungen erfolgen, beispielsweise können die Spreizglieder durch Druckluft oder ein hydraulisches Medium aufgespreizt werden. Bei einer Ausführungsform der Erfindung sind nur zwei Spreizteile vorgesehen, die durch eine mechanische Vorrichtung, nämlich einen Spreizkonus, aufgespreizt werden. Der Spreizkonus ist an einer Betätigungsstange befestigt, die durch den hohlen Querschnitt eines die Spreizklaue tragenden Stabes hindurchgeführt ist und an seinem rückwärtigen Ende zu einer Verschiebebewegung angetrieben ist. Diese Vorrichtung zum Spreizen der Spreizklaue erlaubt eine sehr einfache und robuste Konstruktion.The spreading claw can be spread out by various devices, for example the spreading members can be spread by compressed air or a hydraulic medium. In one embodiment of the invention, only two expansion parts are provided, which are separated by a mechanical device, namely a spreading cone to be spread. The expansion cone is fastened to an actuating rod which is passed through the hollow cross section of a rod carrying the expanding claw and is driven at its rear end to perform a displacement movement. This device for spreading the expanding claw allows a very simple and robust construction.

Die Erfindung bezieht sich weiter auf ein Gewinderohr, das als Mehrkantrohr, beispielsweise als Vierkantrohr ausgebildet ist und entlang seiner Kanten Segmente eines Gewindes aufweist, wobei die Wandstärke im Gewindegrund im wesentlichen gleich wie im Bereich der Seitenwände ist. So ein Gewinde ist sehr robust. Ein solches Gewinderohr eignet sich insbesondere zur Verwendung im Baugewerbe bei Decken- oder anderen Stützen oder Schalungszwingen. Sich in den Gewindesegmenten im Bereich der Kanten festsetzende Verunreinigungen werden beim Einschrauben einer Gewindemutter aus dem Gewinde in den Zwischenraum zwischen der runden Innenfläche der Gewindemutter und den ebenen Seitenflächen des Mehrkantrohres, insbesondere Vierkantrohres, gedrückt. Diese Selbstreinigung des Gewindes ist besonders deshalb gewährleistet, weil in dem Gewindegrund der Gewindesegmente kein die Verunreinigung festhaltender Durchbruch zum Innenraum des Mehrkantrohres vorhanden ist, sondern an dieser Stelle die Wandstärke des Mehrkantrohres in der Regel nahezu erhalten ist.The invention further relates to a threaded tube which is designed as a polygonal tube, for example as a square tube and has segments of a thread along its edges, the wall thickness in the thread base being essentially the same as in the region of the side walls. Such a thread is very robust. Such a threaded pipe is particularly suitable for use in the construction industry for ceiling or other supports or formwork clamps. Contaminants that settle in the thread segments in the area of the edges are pressed when a threaded nut is screwed out of the thread into the space between the round inner surface of the threaded nut and the flat side surfaces of the polygonal tube, in particular a square tube. This self-cleaning of the thread is ensured in particular because there is no breakthrough to the interior of the polygonal tube that holds the contamination in the thread base of the threaded segments, but the wall thickness of the polygonal tube is generally almost preserved at this point.

Weitere Merkmale der Erfindung ergeben sich aus der folgenden Beschreibung einer Ausführungsform der Erfindung in Verbindung mit den Ansprüchen und der Zeichnung. Die einzelnen Merkmale können je für sich oder zu mehreren bei Ausführungsformen der Erfindung verwirklicht sein.Further features of the invention will become apparent from the following description of an embodiment of the invention in conjunction with the claims and the drawing. The individual features can be implemented individually or in groups in embodiments of the invention.

In der Zeichnung sind zum Verständnis der Erfindung wesentliche Elemente einer Ausführungsform der erfindungsgemäßen Vorrichtung schematisch dargestellt. Es zeigen:

Fig. 1
eine Seitenansicht;
Fig. 2
ein Einzelteil in vergrößertem Maßstab.
In the drawing, essential elements of an embodiment of the device according to the invention are shown schematically for understanding the invention. Show it:
Fig. 1
a side view;
Fig. 2
a single part on an enlarged scale.

Bei der in der Zeichnung dargestellten Ausführungsform der Erfindung ist ein Schlitten 1 auf einem Grundgestell 2 längsverschiebbar geführt. Die Verschiebebewegung ist durch eine hydraulische oder pneumatische Vorschubeinrichtung 3 angetrieben. Auf dem Schlitten 1 ist eine Spannvorrichtung 4 für ein Vierkantrohr 5 starr befestigt. Die Spannvorrichtung 4 ist schematisch durch eine einen Zylinder und einen Kolben aufweisende Vorrichtung 6 angedeutet.In the embodiment of the invention shown in the drawing, a carriage 1 is guided in a longitudinally displaceable manner on a base frame 2. The displacement movement is driven by a hydraulic or pneumatic feed device 3. On the carriage 1, a clamping device 4 for a square tube 5 is rigidly attached. The tensioning device 4 is indicated schematically by a device 6 having a cylinder and a piston.

Auf dem Grundgestell 2 ist außerdem eine Platte 7 befestigt, an der ein Trägerrohr 8 angebracht ist. Am freiem Ende des Trägerrohrs 8 sind um eine Achse 9 zwei Spreizteile 10, 11 schwenkbar gelagert. In dem Trägerrohr 8 ist eine durch eine Betätigungsvorrichtung 12 angetriebene Stange 13 verschiebbar geführt, die an ihrem vorderen Ende einen Spreizkonus 14 trägt.On the base frame 2, a plate 7 is also attached to which a support tube 8 is attached. At the free end of the support tube 8, two expansion parts 10, 11 are pivotally mounted about an axis 9. In the carrier tube 8, a rod 13 driven by an actuating device 12 is slidably guided, which carries an expansion cone 14 at its front end.

Die Spreizteile 10, 11 weisen einen Querschnitt auf, der so ausgebildet ist, daß sich die Außenflächen der gespreizten Spreizteile 10, 11 im Bereich der Kanten von innen an das Vierkantrohr 5 anlegen.The expansion parts 10, 11 have a cross section which is designed such that the outer surfaces of the expanded expansion parts 10, 11 lie against the square tube 5 from the inside in the region of the edges.

Die dargestellte Ausführungsform weist zwei Außenwerkzeuge 15, 16 auf, die auf zwei einander gegenüberliegende Kanten des Vierkantrohres 5 einwirken können und an ihrer Stirnfläche so ausgebildet sind, daß Segmente eines Gewindes im Bereich dieser einander gegenüberliegenden Kanten des Vierkantrohres 5 geformt werden. Dabei dienen die innen im Vierkantrohr 5 im Bereich der Außenwerkzeuge 15, 16 befindlichen Spreizgteile 10, 11 als Gegenwerkzeuge für die Außenwerkzeuge 15, 16. Zu diesem Zweck weist die Außenfläche der Spreizteile 10, 11 eine entsprechende Profilierung auf, die die Patrize zu den als Matrize wirkenden Stirnflächen der Außenwerkzeuge 15, 16.The embodiment shown has two external tools 15, 16, which on two opposite edges of the Square tube 5 can act and are formed on its end face so that segments of a thread are formed in the region of these opposite edges of the square tube 5. The expanding parts 10, 11 located inside the square tube 5 in the area of the external tools 15, 16 serve as counter tools for the external tools 15, 16. For this purpose, the outer surface of the expanding parts 10, 11 has a corresponding profile, which the male to the End faces of the external tools 15, 16 acting as a die.

Der Schlitten 1 ist außer durch die Vorrichtung 3 noch durch eine weitere, schematisch angedeutete, Vorrichtung 17 angetrieben, die in Zusammenarbeit mit einer Rastenleiste 18 den Schlitten 1 schrittweise vorschiebt.In addition to the device 3, the carriage 1 is driven by a further, schematically indicated, device 17 which, in cooperation with a catch bar 18, advances the carriage 1 step by step.

Zum abschnittsweise Formen der Gewindesegmente im Bereich der Kanten des Vierkantrohres 5 wird das in der Spannvorrichtung 4 eingespannte Vierkantrohr 5 durch die Vorschubeinrichtung 3 in Achsrichtung des Vierkantrohres 5 über eine, aus den Spreizteilen 10, 11 und dem Spreizkonus 14 bestehende, Spreizklaue geschoben, die zwischen den Außenwerkzeugen 15, 16 in ihrer Lage unveränderlich durch die Stange 8 festgehalten ist. Die Spreizteile 10, 11 werden hierauf durch Zurückziehen des Spreizkonus 14 mit Hilfe der Betätigungsvorrichtung 12 aufgespreizt, so daß sie sich im Bereich von zwei einander gegenüberliegenden Kanten an die Innenflächen des Vierkantrohres 5 anlegen. Die Spreizklaue 10, 11, 14 nimmt als verhältnismäßig starres Gegenwerkzeug den Druck der beiden gegeneinander bewegten Außenwerkzeuge 15, 16 auf. Das Material der Wand des Vierkantrohres 5 tritt bei der Verformung in Vertiefungen an den Außenflächen der Spreizteile 10, 11 ein, so daß im Gewindegrund der Gewindesegmente die Wandstärke in etwa erhalten bleibt.For section-by-section shaping of the thread segments in the region of the edges of the square tube 5, the square tube 5 clamped in the clamping device 4 is pushed by the feed device 3 in the axial direction of the square tube 5 over an expansion claw consisting of the expansion parts 10, 11 and the expansion cone 14, which between the external tools 15, 16 are held in their position unchangeable by the rod 8. The expansion parts 10, 11 are then spread out by pulling back the expansion cone 14 with the aid of the actuating device 12, so that they lie against the inner surfaces of the square tube 5 in the region of two mutually opposite edges. The expanding claw 10, 11, 14, as a relatively rigid counter-tool, absorbs the pressure of the two external tools 15, 16 which are moved relative to one another. The material of the wall of the square tube 5 occurs in the deformation in depressions on the outer surfaces of the expansion parts 10, 11, so that in Thread base of the thread segments the wall thickness is approximately preserved.

Ist ein Abschnitt des Gewindes auf dem Vierkantrohr 5 hergestellt, so verschiebt die Vorrichtung 17 den Schlitten 1 um einen Bearbeitungsabschnitt, bis ein Fühler 23 durch Einfallen in die nächste Raste der Rastenleiste 18 den Antrieb abschaltet. Dann wird der nächste Bearbeitungsabschnitt des Vierkantrohres 5 mit Gewindesegmente versehen.If a section of the thread is produced on the square tube 5, the device 17 shifts the slide 1 by one machining section until a sensor 23 switches off the drive by falling into the next catch of the catch bar 18. Then the next processing section of the square tube 5 is provided with threaded segments.

Sind die beiden einander gegenüberliegenden Kanten des Vierkantrohres 5 mit Gewindesegmenten versehen, so wird das Vierkantrohr 5 in der Spannvorrichtung 4 um 90° gedreht, so daß an den beiden anderen Kanten des Vierkantrohres 5 Gewindesegmente geformt werden können.If the two opposite edges of the square tube 5 are provided with thread segments, the square tube 5 is rotated in the clamping device 4 by 90 °, so that 5 thread segments can be formed on the other two edges of the square tube.

Auf einem Flansch 19 der Stange 8 stützt sich eine Druckschraubenfeder 20 ab, deren anderes Ende eine Scheibe 21 gegen Schrägflächen 22 der Spreizteile 10, 11 drückt und diese in ihre Ruhestellung zurückführt, wenn der Spreizkonus 14 von den Spreizteilen 10, 11 weggeschoben wird.A compression coil spring 20 is supported on a flange 19 of the rod 8, the other end of which presses a disk 21 against inclined surfaces 22 of the expansion parts 10, 11 and returns it to its rest position when the expansion cone 14 is pushed away from the expansion parts 10, 11.

Claims (8)

Verfahren zum Anbringen von Gewindezügen auf Kanten eines Mehrkantrohres, dadurch gekennzeichnet, daß das Mehrkantrohr (5) spanlos dadurch verformt wird, daß zunächst eine Spreizklaue (10,11,14), deren Außenfläche die Innenkontur eines Abschnittes herzustellender Gewindesegmente aufweist, als Unterwerkzeug von innen gegen die Wand des Mehrkantrohres (5) gespannt wird, daß anschließend mindestens ein Außenwerkzeug (15,16), das die Außenkontur eines Abschnittes der herzustellenden Gewindesegmente aufweist, im Bereich der Spreizklaue (10,11,14) von außen gegen Kanten des Mehrkantrohres (5) gepreßt wird, so daß der Werkstoff der Wand des Mehrkantrohres (5) im Bereich der Kanten in die Vertiefungen der Außenfläche der Spreizklaue (10,11,14) eintritt, daß nach der Verformung das Außenwerkzeug (15,16) und die Spreizklaue (10,11,14) von den Rohrwandungen abgehoben werden und dann das Mehrkantrohr (5) relativ Außenwerkzeug (15,16) und Spreizklaue (10,11,14) um die Steigung oder ein Mehrfaches davon axial um einen Bearbeitungsabschnitt verschoben wird.Method for applying thread pulls to the edges of a polygonal tube, characterized in that the polygonal tube (5) is deformed without cutting in that first an expanding claw (10, 11, 14), the outer surface of which has the inner contour of a section of threaded segments to be produced, as a bottom tool from the inside is tensioned against the wall of the polygonal tube (5) so that at least one outer tool (15, 16), which has the outer contour of a section of the thread segments to be produced, in the area of the expanding claw (10, 11, 14) from the outside against edges of the polygonal tube ( 5) is pressed so that the material of the wall of the polygonal tube (5) in the region of the edges enters the recesses in the outer surface of the expanding claw (10, 11, 14), that after the deformation, the external tool (15, 16) and the expanding claw (10, 11, 14) are lifted off the tube walls and then the polygonal tube (5) or the outer tool (15, 16) and expanding claw (10, 11, 14) around the slope r a multiple thereof is shifted axially by a machining section. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die spanlose Verformung durch Hohlprägen erfolgt.A method according to claim 1, characterized in that the non-cutting deformation is carried out by hollow embossing. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die einzelnen Kanten des Mehrkantrohres (5) nacheinander verformt werden.Method according to claim 1 or 2, characterized in that the individual edges of the polygonal tube (5) are deformed one after the other. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Rohrwand im Bereich des Außenwerkzeugs (15,16) und der Spreizklaue (10,11,14) so verformt wird, daß die Wandstärke im Bereich der Gewindesegmente etwa erhalten bleibt.Method according to one of claims 1 to 3, characterized in that the tube wall in the area of the outer tool (15, 16) and the expanding claw (10, 11, 14) is deformed such that the wall thickness in the area of the thread segments is approximately retained. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß sie eine Spannvorrichtung (4) für das Mehrkantrohr (5) und eine Spreizklaue (10,11,14) aufweist, wobei mindestens eines dieser Teile (4 bzw. 10,11,14) parallel zur Achse des Mehrkantrohres (5) verschiebbar geführt ist, und daß die Spreizklaue (10,11,14) in das Mehrkantrohr (5) einführbar und in eine an die Innenwand des Mehrkantrohres (5) anliegende Stellung aufspreizbar und außerdem in eine Stellung zusammenlegbar ist, in der die Außenkontur der Spreizklaue (10,11,14) kleinere Außenabmessungen als die entsprechenden Innenabmessungen des Mehrkantrohres (5) im Bereich der Gewindesegmente aufweist.Device for carrying out the method according to one of claims 1 to 4, characterized in that it has a tensioning device (4) for the polygonal tube (5) and an expanding claw (10, 11, 14), at least one of these parts (4 or 10, 11, 14) is displaceably guided parallel to the axis of the polygonal tube (5), and that the expanding claw (10, 11, 14) can be inserted into the polygonal tube (5) and spread into a position in contact with the inner wall of the polygonal tube (5) and can also be folded into a position in which the outer contour of the expanding claw (10, 11, 14) has smaller outer dimensions than the corresponding inner dimensions of the polygonal tube (5) in the region of the thread segments. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß sich die Außenkontur der aufgespreizten Spreizklaue (10,11,14) an einander gegenüberliegenden Stellen der Innenfläche des Mehrkantrohres (5) abstützt.Device according to claim 5, characterized in that the outer contour of the spread-apart expanding claw (10, 11, 14) is supported at mutually opposite locations on the inner surface of the polygonal tube (5). Vorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Spreizklaue (10,11,14) mindestens zwei am Ende eines in das Mehrkantrohr (5) einführbaren Hohlstabes (8) angelenkte Spreizteile (10,11) aufweist, zwischen denen sich ein in Achsrichtung des Hohlstabes (8) beweglicher Konus (14) befindet, der an einem Stab (13) befestigt ist, der zum Bewegen der Spreizteile (10,11) im Hohlstab (8) geführt ist.Apparatus according to claim 4 or 5, characterized in that the expanding claw (10, 11, 14) has at least two spreading parts (10, 11) articulated at the end of a hollow rod (8) which can be inserted into the polygonal tube (5), between which an in Axial direction of the hollow rod (8) is movable cone (14) which is fastened to a rod (13), which is guided for moving the expansion parts (10, 11) in the hollow rod (8). Durch das Verfahren und die Vorrichtung nach einem der vorhergehenden Ansprüche hergestelltes Gewinderohr, dadurch gekennzeichnet, daß ein Mehrkantrohr entlang seiner Kanten Gewindesegmente aufweist, wobei die Wandstärke im Bereich seiner Gewindesegmente im wesentlichen gleich wie im Bereich seiner Seitenwände ist.Threaded tube produced by the method and the device according to one of the preceding claims, characterized in that a polygonal tube has thread segments along its edges, the wall thickness in the area of its thread segments being substantially the same as in the area of its side walls.
EP92107427A 1991-05-02 1992-04-30 Method and device for making threads on polygonal tubes Expired - Lifetime EP0512426B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4114336A DE4114336A1 (en) 1991-05-02 1991-05-02 METHOD AND DEVICE FOR FITTING THREADED DRIVES ON MULTI-SIDED TUBES
DE4114336 1991-05-02

Publications (2)

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EP0512426A1 true EP0512426A1 (en) 1992-11-11
EP0512426B1 EP0512426B1 (en) 1994-12-07

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EP92107427A Expired - Lifetime EP0512426B1 (en) 1991-05-02 1992-04-30 Method and device for making threads on polygonal tubes

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EP (1) EP0512426B1 (en)
AT (1) ATE115015T1 (en)
DE (2) DE4114336A1 (en)
ES (1) ES2067975T3 (en)

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Publication number Priority date Publication date Assignee Title
CN110508700A (en) * 2019-09-02 2019-11-29 珠海格力智能装备有限公司 Clamping device and pipe expander with same

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Publication number Priority date Publication date Assignee Title
DE19960008C1 (en) * 1999-12-13 2001-08-23 Baunach Und Schmid Gmbh Polygonal tube with thread pulls

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FR552911A (en) * 1921-11-11 1923-05-09 Alsacienne Constr Meca Process for the production of pipes with corrugated walls
US3314276A (en) * 1964-04-07 1967-04-18 Federal Mogul Bower Bearings Bellows forming machine
FR2203685A1 (en) * 1972-10-19 1974-05-17 Lechevallier Maurice
DE3514485A1 (en) * 1985-04-22 1986-10-23 Heinz 4000 Düsseldorf Regenhardt Method and apparatus for the production of slot-bridge filter tubes

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DE3700758A1 (en) * 1987-01-13 1988-07-21 Gd Anker Gmbh & Co Kg METHOD FOR SHAPING A THREAD AND TUBULAR BODY WITH THREAD

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FR552911A (en) * 1921-11-11 1923-05-09 Alsacienne Constr Meca Process for the production of pipes with corrugated walls
US3314276A (en) * 1964-04-07 1967-04-18 Federal Mogul Bower Bearings Bellows forming machine
FR2203685A1 (en) * 1972-10-19 1974-05-17 Lechevallier Maurice
DE3514485A1 (en) * 1985-04-22 1986-10-23 Heinz 4000 Düsseldorf Regenhardt Method and apparatus for the production of slot-bridge filter tubes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110508700A (en) * 2019-09-02 2019-11-29 珠海格力智能装备有限公司 Clamping device and pipe expander with same

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ES2067975T3 (en) 1995-04-01
DE59200890D1 (en) 1995-01-19
EP0512426B1 (en) 1994-12-07
DE4114336A1 (en) 1992-11-05
ATE115015T1 (en) 1994-12-15

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