EP0512426B1 - Method and device for making threads on polygonal tubes - Google Patents
Method and device for making threads on polygonal tubes Download PDFInfo
- Publication number
- EP0512426B1 EP0512426B1 EP92107427A EP92107427A EP0512426B1 EP 0512426 B1 EP0512426 B1 EP 0512426B1 EP 92107427 A EP92107427 A EP 92107427A EP 92107427 A EP92107427 A EP 92107427A EP 0512426 B1 EP0512426 B1 EP 0512426B1
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- EP
- European Patent Office
- Prior art keywords
- claw
- spreadable
- pipe
- multiple sided
- sided pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 210000000078 claw Anatomy 0.000 claims abstract description 40
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 5
- 238000003892 spreading Methods 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims description 2
- 238000004049 embossing Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D15/00—Corrugating tubes
- B21D15/04—Corrugating 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 through 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 recesses in the outer surface of the expanding claw, forming the thread base .
- 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 external tool that form the thread base at the end of the deformation and the depressions forming the thread base 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 carrying out the method, which has a clamping 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 that the expanding claw can be inserted into the polygonal tube and into one the inner wall of the polygonal tube can be spread apart 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 pivotally attached to an extension of a rod, the extension of the rod being supported on the inner surface of the polygonal tube opposite the deformation region when it is expanded.
- 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, an expansion 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 expansion 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 out of the thread when a threaded nut is screwed 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 so as to be longitudinally displaceable 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 spreading parts 10, 11 have a cross section which is designed such that the outer surfaces of the spreading spreading parts 10, 11 lie against the square tube 5 from the inside in the region of the edges.
- the illustrated embodiment 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 outer tools 15, 16 acting as a die.
- the carriage 1 is driven by a further, schematically indicated device 17 which, in cooperation with a notch 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 opposite edges.
- the expanding claw 10, 11, 14, as a relatively rigid counter-tool absorbs the pressure of the two external tools 15, 16 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 root of the thread segments the wall thickness is approximately preserved.
- the device 17 moves 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 machining section of the square tube 5 is provided with thread segments.
- the square tube 5 is rotated in the clamping device 4 by 90 °, so that 5 threaded 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)
- Spinning Or Twisting Of Yarns (AREA)
- Clamps And Clips (AREA)
- Joints With Pressure Members (AREA)
Abstract
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 through 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 recesses in the outer surface of the expanding claw, forming the thread base . 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 external tool that form the thread base at the end of the deformation and the depressions forming the thread base 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 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 carrying out the method, which has a clamping 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 that the expanding claw can be inserted into the polygonal tube and into one the inner wall of the polygonal tube can be spread apart 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 pivotally attached to an extension of a rod, the extension of the rod being supported on the inner surface of the polygonal tube opposite the deformation region when it is expanded. 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, an expansion 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 expansion 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 out of the thread when a threaded nut is screwed 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.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.
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.
- 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 so as to be longitudinally displaceable on a
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
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 spreading
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 illustrated embodiment has two
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
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 area of the edges of the square tube 5, the square tube 5 clamped in the
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
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 threaded segments, the square tube 5 is rotated in the
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
Claims (8)
- Method for the introduction of thread grooves onto edges of a multiple sided pipe whereby the multiple sided pipe (5) is worked without cutting in that, initially, a spreadable claw (10, 11, 14) whose outer surface exhibits the inner contours of a section of a threaded section which is to be produced, is, as lower tool, clamped from the inside against the wall of the multiple walled pipe (5) and, subsequently, at least one outer tool (15, 16), having the outer contour of a section of the threaded section to be produced, is pressed from the outside in the vicinity of the spreadable claw (10, 11, 14) against edges of the multiple sided pipe (5) so that the wall material of the multiple sided pipe (5) in the region of the edges enters into the depressions in the outer surface of the spreading member (10, 11, 14), and after shaping, the outer tool (15, 16) and the spreadable claw (10, 11, 14) are removed from the walls of the pipe and the multiple sided pipe (5) is then displaced axially, by a working length, relative to the outer tool (15, 16) and the spreadable claw (10, 11, 14) by the pitch or by a multiple thereof.
- Method according to claim 1, characterized in that the working without cutting is done by embossing.
- Method according to claim 1 or 2, characterized in that the individual edges of the multiple sided pipe (5) are sequentially shaped.
- Method according to one of the claims 1 to 3, characterized in that the pipe wall in the region of the outer tools (15, 16) and of the spreadable claw (10, 11, 14) is shaped in such a fashion that the wall strength in the region of the threaded section remains approximately constant.
- Apparatus for carrying out the method according to one of the claims 1 to 4, whereby the apparatus exhibits a clamping device (4) for the multiple sided pipe (5) and a spreadable claw (10, 11, 14), whereby at least one of these parts (4 or 10, 11, 14) can be displaced parallel to the axis of the multiple sided pipe (5) and the spreadable claw (10, 11, 14) can be introduced into the multiple sided pipe (5) and can be spread out at a position to seat at the inner wall of the multiple sided pipe (5) and, in addition, can be folded together at a location at which the outer shape of the spreadable claw (10, 11, 14) has smaller outer dimensions than the corresponding inner dimensions of the multiple sided pipe (5) in the region of the threaded sections.
- Device according to claim 5 characterized in that the outer contours of the spread-out spreadable claw (10, 11, 14) are supported at oppositely lying locations of the inner surface of the multiple sided pipe (5).
- Device according to claim 4 or 5 characterized in that the spreadable claw (10, 11, 14) exhibits at least two spreadable hinged members (10, 11) at the end of a hollow member (8) which can be introduced into the multiple sided pipe (5) and between which a movable cone (14) is located which can be moved in the axial direction of the hollow member (8) and which is attached to a rod (13) introduced into the hollow member (8) to move the spreadable members (10, 11).
- Threaded pipe (5) produced by the method and the apparatus according to one of the preceding claims whereby a multiple sided pipe exhibits threaded sections along its edges with wall strengths in the vicinity of its threaded sections which are largely equal to those in vicinity of its side walls.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4114336 | 1991-05-02 | ||
| DE4114336A DE4114336A1 (en) | 1991-05-02 | 1991-05-02 | METHOD AND DEVICE FOR FITTING THREADED DRIVES ON MULTI-SIDED TUBES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0512426A1 EP0512426A1 (en) | 1992-11-11 |
| EP0512426B1 true EP0512426B1 (en) | 1994-12-07 |
Family
ID=6430827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92107427A Expired - Lifetime EP0512426B1 (en) | 1991-05-02 | 1992-04-30 | Method and device for making threads on polygonal tubes |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0512426B1 (en) |
| AT (1) | ATE115015T1 (en) |
| DE (2) | DE4114336A1 (en) |
| ES (1) | ES2067975T3 (en) |
Families Citing this family (2)
| 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 |
| CN110508700B (en) * | 2019-09-02 | 2020-11-27 | 珠海格力智能装备有限公司 | Clamping device and pipe expander with same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| DE3700758A1 (en) * | 1987-01-13 | 1988-07-21 | Gd Anker Gmbh & Co Kg | METHOD FOR SHAPING A THREAD AND TUBULAR BODY WITH THREAD |
-
1991
- 1991-05-02 DE DE4114336A patent/DE4114336A1/en not_active Ceased
-
1992
- 1992-04-30 AT AT92107427T patent/ATE115015T1/en active
- 1992-04-30 EP EP92107427A patent/EP0512426B1/en not_active Expired - Lifetime
- 1992-04-30 ES ES92107427T patent/ES2067975T3/en not_active Expired - Lifetime
- 1992-04-30 DE DE59200890T patent/DE59200890D1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE4114336A1 (en) | 1992-11-05 |
| ATE115015T1 (en) | 1994-12-15 |
| ES2067975T3 (en) | 1995-04-01 |
| DE59200890D1 (en) | 1995-01-19 |
| EP0512426A1 (en) | 1992-11-11 |
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