EP0274719A2 - Thread-forming method and tubular body provided with a thread - Google Patents

Thread-forming method and tubular body provided with a thread Download PDF

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Publication number
EP0274719A2
EP0274719A2 EP87118889A EP87118889A EP0274719A2 EP 0274719 A2 EP0274719 A2 EP 0274719A2 EP 87118889 A EP87118889 A EP 87118889A EP 87118889 A EP87118889 A EP 87118889A EP 0274719 A2 EP0274719 A2 EP 0274719A2
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EP
European Patent Office
Prior art keywords
thread
connecting sleeve
shaping
tubular body
connection sleeve
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
EP87118889A
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German (de)
French (fr)
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EP0274719A3 (en
EP0274719B1 (en
Inventor
Heinz Gruber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GD-ANKER GmbH
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GD-ANKER GmbH
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Publication date
Application filed by GD-ANKER GmbH filed Critical GD-ANKER GmbH
Priority to AT87118889T priority Critical patent/ATE90891T1/en
Publication of EP0274719A2 publication Critical patent/EP0274719A2/en
Publication of EP0274719A3 publication Critical patent/EP0274719A3/en
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Publication of EP0274719B1 publication Critical patent/EP0274719B1/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/22—Rods or pipes with helical structure
    • 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/02—Couplings; joints
    • E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
    • E21B17/042—Threaded
    • E21B17/0426—Threaded with a threaded cylindrical portion, e.g. for percussion rods

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • the invention further relates to a tubular body according to the preambles of claims 4 and 5 and to applications according to claims 7 and 8.
  • a smooth piece of pipe When manufacturing a sleeve, a smooth piece of pipe can be assumed, which receives an internal thread due to external deformation, the profile of which resembles that of a round thread.
  • the dimensions of the originally smooth-walled output part are dimensioned as a function of the dimensions of the mating thread onto which the sleeve is to be screwed, in such a way that there is a minimum clearance between the threads that can be brought into engagement with one another. It is particularly advantageous that the internal thread formed in this way can be produced in a single deformation step. Compared to a thread cutting process, the manufacturing costs of a socket with an internal thread can be significantly reduced.
  • the features of claim 3 have the advantage that the same working method can be used both for the production of the internal thread and for the production of the cooperating external thread, only the forming tool for the purpose of adaptation to the curved thread flanks of the internal thread and for adjustment a necessary game between the internal and external thread must be adjusted slightly.
  • the application of the method according to the invention is particularly advantageous in the production of connecting sleeves, which are used when coupling extension rods a rock bolt, a boring bar or the like are used.
  • connecting sleeves which are used when coupling extension rods a rock bolt, a boring bar or the like are used.
  • the connecting sleeve is solidified by the previous forming process and consequently has a high strength has an effect.
  • a round thread or a thread type similar to this must be used to ensure proper handling under the forthcoming operating conditions.
  • the manufacturing method according to the invention is associated with a flow of the material, it is naturally - without reworking the respective deformation contour - limited to the production of such thread types in which no acute-angled edges, such as with a metric thread, are to be created.
  • the entire outer contour thereof, including that of the connecting sleeve is expediently provided with threaded indentations, so that the outside discharge or washing away of the cuttings is facilitated in the case of narrow boreholes.
  • the use of the method according to the invention is also very advantageous in the production of connecting sleeves which are used in channel struts.
  • the fact that the connecting sleeves according to the invention can be of practically any length has a favorable effect here. In addition to good guidance of the threaded spindles, this also results in a wear-resistant design.
  • FIG. 1 denotes the end part of a rock bolt on the borehole side, which is also used as a boring bar.
  • This end part 1 is thus a tubular body, which carries a known drill bit 2 on its end facing the drilling base.
  • the drill bit 2 is provided in a manner not shown in the drawing with a central bore which serves to guide a flushing medium. This bore is in conductive connection with the interior of the end part 1.
  • the end part 1 or the tubular body 1 has a threaded section 3 which is connected to a V extension rod 5 via a connecting sleeve 4.
  • the extension rod 5 carries a threaded section 6.
  • the extension rod 5, like the end part 1, is designed as a tubular body. In principle, several such extension rods 5 can be placed next to each other and thus the total length of the rock anchor can be adapted to the respective requirements within wide limits.
  • the illustration of the section of the present rock anchor located in the region of the borehole end, to which a hammer drill or other drive unit is coupled during the drilling operation, has been omitted for reasons of clarity in the drawing.
  • the threaded sections 3, 6, which are designed as external threads, on the tubular bodies 1, 5 and the cooperating internal thread of the connecting sleeve 4, which is not illustrated in FIG enables easy handling.
  • the internal thread of the connecting sleeve 4 is produced by a non-cutting shaping, here by cold forming, in which the profile shown in FIG. 1 is produced by a deformation tool on the outside 7 of the connecting sleeve 4, the internal thread being formed by a to the outside profile complementary, internally effective material displacement is formed.
  • the outside 7 consists of a helically wound, approximately circular arc-shaped indentation 8 in cross section, with smooth, only slightly deformed surface sections 9 remaining between the individual indentation passages 8.
  • Fig. 3 shows that through the deformation process on the inside 10 of the threaded sleeve threads 11 are formed, the cross-sectional shape of which is essentially determined by arcs and which can thus be regarded as round threads. These threads 11 are directly opposite the indentations 8. It is essential for the subject matter of the invention that the formation of these threads 11 on the inside can be controlled at least so precisely, both in terms of the thread depth and in terms of the pitch, by the externally effective deformation that the threads 11 can function as an internal thread with respect to a predetermined external thread, which in the present case is formed by the threaded sections 3, 6.
  • Fig. 4 shows the effective thread pairing of the internal thread of the connecting sleeve 4 on the one hand and the external thread of the threaded portion 3 on the other.
  • the threaded sections 3, 6 are also produced by a cold-forming process and consequently have a profile which corresponds qualitatively to that of the outside 7 of the connecting sleeve 4.
  • connection sleeves of rock anchors In principle, it can be used with advantage in all those cases in which a tubular starting body has to be provided on the inside with a round thread or a comparable thread.
  • FIG. 5 shows an embodiment of a connecting sleeve 4, which can be used in a two-sided duct strut and is therefore provided with two different, namely counter-rotating, threaded sections 12, 13.
  • Threaded spindles are used in the end regions of this connecting sleeve 4 and are used in a manner known per se to support duct walls in civil engineering. These threaded spindles have an outer profile which essentially corresponds to that of the tubular body 1, 5 of FIG. 1, but these threaded spindles are not shown for reasons of clarity in the drawing are posed.
  • the connecting sleeve 4 is provided with an auxiliary device, also not shown in the drawing, for initiating a rotary movement.
  • this auxiliary device can be a bore into which a lever is inserted.
  • a nut or a molded tube can also be welded onto the connecting sleeve 4, which serves to initiate a rotary movement in connection with a corresponding tool.
  • a plastic nut can also be cast or pressed onto the outside of the connecting sleeve 4.
  • connecting sleeve 4 can be made practically indefinitely long with the internal thread produced according to the invention, there is a particularly reliable connecting sleeve which improves the buckling stability of the threaded spindles of channel struts. At the same time, the individual parts of the channel strut can be made relatively small due to the length of the connecting sleeve.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Dowels (AREA)
  • Ropes Or Cables (AREA)
  • Joining Of Building Structures In Genera (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Abstract

The production of the internal thread of a connection sleeve (4), which is used as a coupling element for parts of a rock support or of a drill rod, by machine-forming, in particular by thread-cutting, entails great effort since, in the round thread used here, a considerable amount of machining work is required. Furthermore, it is disadvantageous in this application in the machining of the thread that the long-term strength of the connection sleeve is considerably impaired due to the notch effect in the base region of the thread turns. A connection sleeve and a method for its production are proposed, in which the internal thread is produced without machining by shaping the outside of the connection sleeve (4) in the manner of a thread so that the image of this shaping forms the internal thread to be produced on the inside. Apart from the increase in strength caused by the non-cutting shaping, which is usually cold shaping, due to material reinforcement, the further advantage results that the shaping required here can be applied in a single operation so that the production costs of connection sleeves (4) of this type can be reduced. Furthermore, it is advantageous that the external thread, interacting with the internal thread of the connection sleeve, of the components to be connected to one another can have a basic shape which corresponds to the outside thread-type shaping of the connection sleeve (4). <IMAGE>

Description

Die Erfindung bezieht sich auf ein Verfahren entsprechend dem Oberbegriff des Anspruchs 1. Die Erfindung bezieht sich ferner auf einen Rohrkörper entsprechend den Ober­begriffen der Ansprüche 4 und 5 sowie auf Anwendungen entsprechend den Ansprüchen 7 und 8.The invention relates to a method according to the preamble of claim 1. The invention further relates to a tubular body according to the preambles of claims 4 and 5 and to applications according to claims 7 and 8.

Es ist üblich, die Verlängerungsstangen von Gebirgsankern, Bohrstangen und dergleichen durch Schraubenverbindungen untereinander zu verbinden. Hierzu weisen die beiden ein­ander gegenüberstehenden, miteinander zu verbindenden Bohrstangen- bzw. Gebirgsankerteile ein Außengewinde auf und werden mittels einer ein entsprechendes Innengewinde aufweisenden Verbindungsmuffe aneinandergesetzt. Insbeson­dere bei Bohrstangen dienen diese Gewindeabschnitte gleich­zeitig als Kupplungsstellen für die Ankupplung eines Bohr­hammers oder eines sonstigen Antriebsaggregates. Um die leichte Handhabbarkeit dieser Gewindeverbindung ange­ sichts der hohen aufzunehmenden Belastungen auch bei starker Verschmutzung zu ermöglichen, wird überlicherweise von einem Rundgewinde oder einem angenäherten Rundgewinde Gebrauch gemacht.It is common to connect the extension rods of rock bolts, drill rods and the like to each other by screw connections. For this purpose, the two mutually opposing boring bar or rock bolt parts to be connected to one another have an external thread and are attached to one another by means of a connecting sleeve having a corresponding internal thread. In the case of boring bars in particular, these threaded sections serve at the same time as coupling points for coupling a hammer drill or other drive unit. To make this threaded connection easy to handle To allow for the high loads to be absorbed even with heavy contamination, use is usually made of a round thread or an approximate round thread.

Es ist bekannt, ein Innengewinde derartiger Verbindungs­muffen durch einen Zerspanungsvorgang, insbesondere durch Gewindeschneiden bzw. herzustellen. Von Nachteilen ist hierbei jedoch nicht nur der Umfang der zu leistenden Zerspanungsarbeit, sondern auch die durch das abgespante Werkstoffvolumen bedingte Querschnittsschwächung der Muffe sowie die durch die Zerspanung bedingte Kerbwirkung insbesondere im Grund der einzelnen Gewindegänge, durch welche die Dauerfestigkeit der Muffe erheblich beein­trächtigt wird.It is known to produce an internal thread of such connecting sleeves by a machining process, in particular by thread cutting or. However, disadvantages are not only the scope of the machining work to be performed, but also the weakening of the cross-section of the sleeve due to the material volume removed and the notch effect caused by the machining, particularly in the reason of the individual threads, which significantly impair the fatigue strength of the sleeve.

Es ist daher die Aufgabe der Erfindung, ein Verfahren zur spanlosen Formung eines Gewindes und einen ein Gewinde tragenden Rohrkörper zu konzipieren, welche jeweils einfach durchführbar bzw. herstellbar sind, insbesondere mit geringen Herstellungskosten verbunden sind und die Bereitstellung einer eine hohe Festigkeit gewährleistenden Schraubverbindung ermöglichen. Diese Aufgabe, soweit das Verfahren betroffen ist, wird bei einem gattungsgemäßen Verfahren durch die kennzeichnenden Merk­male des Anspruchs 1 gelöst. Erfindungswesentlich ist, daß bei einem an sich bekannten spanlosen Umformvorgang durch das jeweilige, in die eine Seite des rohrförmigen Grundkörpers eingreifende Umformwerkzeug das herzustel­lende Gewinde nur mittelbar geformt wird, da als dieses bei einem beispielsweise außenseitigen Verformungsein­griff das sich innenseitig ergebende Abbild dieser Ver­formung gilt. Bei der Herstellung einer Muffe kann somit von einem glatten Rohrstück ausgegangen werden, welches durch außenseitige Verformung ein Innengewinde erhält, dessen Profil demjenigen eines Rundgewindes ähnelt. Die Abmessungen des ursprünglich glattwandigen Ausgangsteils sind in Abhängigkeit von den Abmessungen des Gegengewindes, auf welches die Muffe aufgeschraubt werden soll, derart bemessen, daß sich ein Mindestspiel zwischen den, mitein­ander in Eingriff bringbaren Gewindegängen ergibt. Von besonderem Vorteil ist, daß sich das auf diese Weise geformte Innengewinde in einem einzigen Verformungsgang herstellen läßt. Im Vergleich zu einem Gewindeschneidvorgang lassen sich so die Herstellungskosten einer mit Innengewinde versehenen Muffe erheblich senken.It is therefore the object of the invention to design a process for the non-cutting shaping of a thread and a tubular body carrying a thread, which are each easy to carry out or manufacture, in particular are associated with low manufacturing costs and enable the provision of a screw connection which ensures high strength. This task, insofar as the method is concerned, is achieved in a generic method by the characterizing features of claim 1. It is essential to the invention that in a non-cutting forming process known per se, the thread to be produced is only indirectly formed by the respective forming tool which engages in one side of the tubular base body, since the image of this deformation which results on the inside applies, for example, to an outside deformation intervention. When manufacturing a sleeve, a smooth piece of pipe can be assumed, which receives an internal thread due to external deformation, the profile of which resembles that of a round thread. The dimensions of the originally smooth-walled output part are dimensioned as a function of the dimensions of the mating thread onto which the sleeve is to be screwed, in such a way that there is a minimum clearance between the threads that can be brought into engagement with one another. It is particularly advantageous that the internal thread formed in this way can be produced in a single deformation step. Compared to a thread cutting process, the manufacturing costs of a socket with an internal thread can be significantly reduced.

Die Herstellung eines Innengewindes in einer Muffe gemäß Anspruch 2 stellt den wichtigsten Anwendungsfall des erfindungsgemäßen Verfahrens dar. Grundsätzlich können alle spanlosen Umformverfahren bei der Herstellung einge­setzt werden, und zwar sowohl Warmumform- als auch Kalt­umformverfahren. Besonders vorteilhaft, insbesondere aufgrund der erzielbaren geringen Toleranzen sowie der durch die Umformung bedingten Werkstoffverfestigung sind jedoch die Kaltumformverfahren.The production of an internal thread in a sleeve according to claim 2 represents the most important application of the method according to the invention. Basically, all non-cutting forming processes can be used in the production, both hot and cold forming processes. However, the cold forming processes are particularly advantageous, in particular because of the achievable small tolerances and the material hardening caused by the forming.

Die Merkmale des Anspruchs 3 bringen den Vorteil mit sich, daß das gleich Arbeitsverfahren sowohl für die Herstellung des Innengewindes als auch für die Herstellung des mit diesem zusammenwirkenden Außengewindes eingesetzt werden kann, wobei lediglich das Umformwerkzeug zwecks Anpassung an die gekrümmten Gewindeflanken des Innengewindes sowie zur Einstellung eines notwendigen Spiels zwischen Innen- ­und Außengewinde geringfügig angepaßt werden muß.The features of claim 3 have the advantage that the same working method can be used both for the production of the internal thread and for the production of the cooperating external thread, only the forming tool for the purpose of adaptation to the curved thread flanks of the internal thread and for adjustment a necessary game between the internal and external thread must be adjusted slightly.

Besonders vorteilhaft ist entsprechend dem Anspruch 7 die Anwendung des erfindungsgemäßen Verfahrens bei der Herstellung von Verbindungsmuffen, die bei der Ankupplung von Verlängerungsstangen eines Gebirgsankers, einer Bohrstange oder dergleichen Verwendung finden. Es wirkt sich in diesen, durch eine extrem hohe mechanische Belastung charakterisierten Fällen insbesondere der Umstand aus, daß die Verbindungs­muffe durch den vorangegangenen Umformprozeß verfestigt ist und demzufolge eine hohe Festigkeit aufweist. Auch muß in diesen Anwendungsfällen aufgrund der zu erwarten­den starken Verschmutzung ein Rundgewinde oder ein diesem ähnlicher Gewindetyp eingesetzt werden, um unter den anstehenden Betriebsbedingungen eine einwandfreie Hand­habung sicherzustellen. Da das erfindungsgemäße Herstell­verfahren mit einem Fließen des Werkstoffs verbunden ist, ist es naturgemäß - ohne Nachbearbeitung der jeweiligen Verformungskontur - auf die Herstellung solcher Gewinde arten beschränkt, bei denen keine spitzwinkligen Kanten wie beispielsweise bei einem metrischen Gewinde zu er­stellen sind. Zweckmäßigerweise sind im Falle von Bohr­stangen deren gesamte Außenkontur einschließlich derjenigen der Verbindungsmuffe mit Gewindeeinformungen versehen, so daß bei engen Bohrlöchern die außenseitige Abführung bzw. Abschwemmung des Bohrkleins erleichtert wird.According to claim 7, the application of the method according to the invention is particularly advantageous in the production of connecting sleeves, which are used when coupling extension rods a rock bolt, a boring bar or the like are used. In these cases, which are characterized by an extremely high mechanical load, the fact that the connecting sleeve is solidified by the previous forming process and consequently has a high strength has an effect. Also in these applications, due to the heavy contamination to be expected, a round thread or a thread type similar to this must be used to ensure proper handling under the forthcoming operating conditions. Since the manufacturing method according to the invention is associated with a flow of the material, it is naturally - without reworking the respective deformation contour - limited to the production of such thread types in which no acute-angled edges, such as with a metric thread, are to be created. In the case of boring bars, the entire outer contour thereof, including that of the connecting sleeve, is expediently provided with threaded indentations, so that the outside discharge or washing away of the cuttings is facilitated in the case of narrow boreholes.

Sehr vorteilhaft ist entsprechend dem Anspruch 8 die An­wendung des erfindungsgemäßen Verfahrens auch bei der Her­stellung von Verbindungsmuffen, die bei Kanalstreben ein­gesetzt werden. Es wirkt sich hier der Umstand günstig aus, daß die erfindungsgemäßen Verbindungsmuffen praktisch belie­big lang ausgebildet werden können. Hieraus folgt neben einer guten Führung der Gewindespindeln auch eine ver­schleißgünstige Konstruktionsform.According to claim 8, the use of the method according to the invention is also very advantageous in the production of connecting sleeves which are used in channel struts. The fact that the connecting sleeves according to the invention can be of practically any length has a favorable effect here. In addition to good guidance of the threaded spindles, this also results in a wear-resistant design.

Die eingangs geschilderte Aufgabe, soweit sie einen mit einem Gewinde versehenen Rohrkörper sowie eine Gewinde­verbindung als solche betrifft, ist bei einem gattungs­gemäßen Rohrkörper sowie einer gattungsgemäßen Gewinde­verbindung entsprechend den Ansprüchen 5 bis 8 durch die kennzeichnenden Merkmale dieser Ansprüche gelöst.The task described at the outset, insofar as it relates to a threaded tubular body and a threaded connection as such, is achieved in a generic tubular body and a generic threaded connection according to claims 5 to 8 by the characterizing features of these claims.

Die Erfindung wird im folgenden unter Bezugnahme auf das in den Zeichnungen dargestellte Ausführungsbeispiel einer Gewindeverbindung näher erläutert werden. Es zeigen:

  • Fig. 1 eine Teilansicht eines gleichzeitig als Bohrstange benutzten Gebirgsankers;
  • Fig. 2 eine vergrößerte Darstellung der Ansicht einer erfindungsgemäßen Verbindungsmuffe;
  • Fig. 3 eine Schnittdarstellung der Verbindungsmuffe gemäß Fig. 2 in einer Schnittebene III-III;
  • Fig. 4 eine schematische, anhand eines Ausschnittes wiedergegebene erfindungsgemäße Gewindeverbindung;
  • Fig. 5 eine erfindungsgemäße auf einen Einsatz bei einer zweiseitigen Kanalstrebe ausgerichtete Verbindungsmuffe.
The invention will be explained in more detail below with reference to the exemplary embodiment of a threaded connection shown in the drawings. Show it:
  • Figure 1 is a partial view of a rock bolt used simultaneously as a boring bar.
  • 2 is an enlarged view of the view of a connecting sleeve according to the invention;
  • 3 shows a sectional illustration of the connecting sleeve according to FIG. 2 in a sectional plane III-III;
  • 4 shows a schematic threaded connection according to the invention reproduced on the basis of a detail;
  • 5 shows a connecting sleeve according to the invention, which is designed for use in a double-sided duct strut.

Mit 1 ist in Fig. 1 das bohrlochseitige Endteil eines Gebirgsankers bezeichnet, der gleichzeitig als Bohrstange benutzt wird. Dieses Endteil 1 ist somit ein Rohrkörper, welcher auf seinem, der Bohrsohle zugekehrten Ende eine an sich bekannte Bohrkrone 2 trägt. Die Bohrkrone 2 ist in zeichnerisch nicht dargestellter Weise mit einer zentralen Bohrung versehen, welche der Führung eines Spülmediums dient. Diese Bohrung steht mit dem Innenraum des Endteils 1 in leitender Verbindung.1 in FIG. 1 denotes the end part of a rock bolt on the borehole side, which is also used as a boring bar. This end part 1 is thus a tubular body, which carries a known drill bit 2 on its end facing the drilling base. The drill bit 2 is provided in a manner not shown in the drawing with a central bore which serves to guide a flushing medium. This bore is in conductive connection with the interior of the end part 1.

Das Endteil 1 bzw. der Rohrkörper 1 weist einen Gewinde­abschnitt 3 auf, der über eine Verbindungsmuffe 4 an eine V Verlängerungsstange 5 angeschlossen ist. Die Verlängerungs­stange 5 trägt einen Gewindeabschnitt 6. Die Verlängerungs­stange 5 ist im übrigen wie das Endteil 1 als Rohrkörper ausgebildet. Grundsätzlich können mehrere derartige Ver­längerungsstangen 5 aneinandergesetzt und damit die Gesamtlänge des Gebirgsankers in weiten Grenzen den jeweiligen An­forderungen angepaßt werden. Auch die Darstellung des im Bereich des bohrlochseitigen Endes befindlichen Ab­schnitts des vorliegenden Gebirgsankers, an welchem während des Bohrbetriebes ein Bohrhammer oder ein sonsti­ges Antriebsaggregat angekuppelt ist, ist aus Gründen der zeichnerischen Übersichtlichkeit verzichtet worden.The end part 1 or the tubular body 1 has a threaded section 3 which is connected to a V extension rod 5 via a connecting sleeve 4. The extension rod 5 carries a threaded section 6. The extension rod 5, like the end part 1, is designed as a tubular body. In principle, several such extension rods 5 can be placed next to each other and thus the total length of the rock anchor can be adapted to the respective requirements within wide limits. The illustration of the section of the present rock anchor located in the region of the borehole end, to which a hammer drill or other drive unit is coupled during the drilling operation, has been omitted for reasons of clarity in the drawing.

Die als Außengewinde ausgebildeten Gewindeabschnitte 3, 6 auf den Rohrkörpern 1, 5 sowie das mit diesen zusammen­wirkende, in Fig. 1 zeichnerisch nicht dargestellte Innengewinde der Verbindungsmuffe 4 sind in dem gezeigten Ausführungsbeispiel als angenähertes Rundgewinde ausge­bildet, welches trotz der beim Bohrbetrieb anstehenden starken Verschmutzungen eine problemlose Handhabung er­möglicht. Erfindungsgemäß ist das Innengewinde der Ver­bindungsmuffe 4 durch eine spanlose Formgebung, hier durch eine Kaltverformung hergestellt, bei welcher durch ein Verformungswerkzeug auf der Außenseite 7 der Verbin­dungsmuffe 4 das in Fig. 1 gezeigte Profil hergestellt wird, wobei das Innengewinde durch eine, zu dem außen­seitigen Profil komplementäre, innenseitig wirksame Ma­terialverdrängung gebildet wird. Hierauf soll im folgen­den unter Bezugnahme auf die Fig. 2 bis 4 näher einge­gangen werden. Wie die in Fig. 2 gezeigte Ansicht einer Verbindungsmuffe 4 erkennen läßt, besteht die Außenseite 7 aus einer schraubenlinienförmig gewundenen, im Quer­schnitt in etwa kreisbogenförmigen Einformung 8, wobei zwischen den einzelnen Einformungsgängen 8 glatte, nur unwe­sentlich verformte Oberflächenabschnitte 9 verbleiben.The threaded sections 3, 6, which are designed as external threads, on the tubular bodies 1, 5 and the cooperating internal thread of the connecting sleeve 4, which is not illustrated in FIG enables easy handling. According to the invention, the internal thread of the connecting sleeve 4 is produced by a non-cutting shaping, here by cold forming, in which the profile shown in FIG. 1 is produced by a deformation tool on the outside 7 of the connecting sleeve 4, the internal thread being formed by a to the outside profile complementary, internally effective material displacement is formed. This will be discussed in more detail below with reference to FIGS. 2 to 4. As can be seen from the view of a connecting sleeve 4 shown in FIG. 2, the outside 7 consists of a helically wound, approximately circular arc-shaped indentation 8 in cross section, with smooth, only slightly deformed surface sections 9 remaining between the individual indentation passages 8.

Fig. 3 läßt erkennen, daß durch den Verformungsprozeß auf der Innenseite 10 der Gewindemuffe sich Gewindegänge 11 bilden, deren Querschnittsgestalt im wesentlichen durch Kreisbögen bestimmt ist und welche somit als Rundgewinde angesehen werden können. Diese Gewindegänge 11 liegen unmittelbar den Einformungen 8 gegenüber. Für den Erfin­dungsgegenstand wesentlich ist, daß die Ausbildung dieser innenseitigen Gewindegänge 11 sowohl hinsichtlich der Ge­windetiefe als auch hinsichtlich der Steigung durch die außenseitig wirksame Verformung zumindest so genau steuer­bar ist, daß die Gewindegänge 11 als Innengewinde bezüg­lich eines vorgegebenen Außengewindes fungieren können, welches im vorliegenden Fall durch die Gewindeabschnitte 3, 6 gebildet wird.Fig. 3 shows that through the deformation process on the inside 10 of the threaded sleeve threads 11 are formed, the cross-sectional shape of which is essentially determined by arcs and which can thus be regarded as round threads. These threads 11 are directly opposite the indentations 8. It is essential for the subject matter of the invention that the formation of these threads 11 on the inside can be controlled at least so precisely, both in terms of the thread depth and in terms of the pitch, by the externally effective deformation that the threads 11 can function as an internal thread with respect to a predetermined external thread, which in the present case is formed by the threaded sections 3, 6.

Fig. 4 läßt die auf diese Weise wirksame Gewindepaarung des Innengewindes der Verbindungsmuffe 4 einerseits und des Außengewindes des Gewindeabschnittes 3 andererseits erkennen. Die Gewindeabschnitte 3, 6 sind ebenfalls durch einen Kaltverformungsprozeß hergestellt und weisen dem­zufolge ein Profil auf, welches qualitativ demjenigen der Außenseite 7 der Verbindungsmuffe 4 entspricht.Fig. 4 shows the effective thread pairing of the internal thread of the connecting sleeve 4 on the one hand and the external thread of the threaded portion 3 on the other. The threaded sections 3, 6 are also produced by a cold-forming process and consequently have a profile which corresponds qualitatively to that of the outside 7 of the connecting sleeve 4.

Der Erfindungsgegenstand ist nicht auf die Anwendung bei Verbindungsmuffen von Gebirgsankern begrenzt. Er kann grundsätzlich mit Vorteil in allen den Fällen Anwendung finden, bei denen ein rohrförmiger Ausgangskörper innen­seitig mit einem Rundgewinde oder einem vergleichbaren Gewinde versehen werden muß.The subject matter of the invention is not limited to use in connection sleeves of rock anchors. In principle, it can be used with advantage in all those cases in which a tubular starting body has to be provided on the inside with a round thread or a comparable thread.

In Fig. 5 ist eine Ausführungsform einer Verbindungsmuffe 4 gezeigt, die bei einer zweiseitigen Kanalstrebe Verwen­dung finden kann und demzufolge mit zwei unterschiedlichen, nämlich gegenläufigen Gewindeabschnitten 12, 13 versehen ist. In die Endbereiche dieser Verbindungsmuffe 4 werden Gewindespindeln eingesetzt, die in an sich bekannter Weise der Abstützung von Kanalwandungen des Tiefbaus die­nen. Diese Gewindespindeln weisen ein Außenprofil auf, welches im wesentlichen demjenigen der Rohrkörper 1, 5 der Fig. 1 entspricht, wobei diese Gewindespindeln jedoch aus Gründen der zeichnerischen Übersichtlichkeit nicht dar­ gestellt sind. Um bei einer Relativdrehung der Verbindungs­muffe 4 gegenüber den Gewindespindeln ein Ausfahren der letzteren bzw. deren Anpressung an die abzustützenden Kanalwandungen zu bewirken, ist die Verbindungsmuffe 4 mit einer zeichnerisch ebenfalls nicht dargestellten Hilfs­einrichtung zur Einleitung einer Drehbewegung versehen. Diese Hilfseinrichtung kann im einfachsten Fall eine Boh­rung sein, in die ein Hebel eingesetzt wird. Es kann je­doch auf die Verbindungsmuffe 4 auch eine Mutter bzw. ein Formrohr aufgeschweißt sein, welches in Verbindung mit einem entsprechenden Werkzeug der Einleitung einer Dreh­bewegung dient. Gegebenenfalls kann auch eine Kunststoff­mutter an der Außenseite der Verbindungsmuffe 4 angegossen bzw. angepreßt sein.5 shows an embodiment of a connecting sleeve 4, which can be used in a two-sided duct strut and is therefore provided with two different, namely counter-rotating, threaded sections 12, 13. Threaded spindles are used in the end regions of this connecting sleeve 4 and are used in a manner known per se to support duct walls in civil engineering. These threaded spindles have an outer profile which essentially corresponds to that of the tubular body 1, 5 of FIG. 1, but these threaded spindles are not shown for reasons of clarity in the drawing are posed. In order to cause the latter to extend or be pressed against the channel walls to be supported when the connecting sleeve 4 is rotated relative to the threaded spindles, the connecting sleeve 4 is provided with an auxiliary device, also not shown in the drawing, for initiating a rotary movement. In the simplest case, this auxiliary device can be a bore into which a lever is inserted. However, a nut or a molded tube can also be welded onto the connecting sleeve 4, which serves to initiate a rotary movement in connection with a corresponding tool. If necessary, a plastic nut can also be cast or pressed onto the outside of the connecting sleeve 4.

Da die Verbindungsmuffe 4 mit dem erfindungsgemäß herge­stellten Innengewinde praktisch beliebig lang gemacht werden kann, ist eine besonders zuverlässige, die Knick­stabilität der Gewindespindeln von Kanalstreben verbes­sernde Verbindungsmuffe gegeben. Gleichzeitig können auf diese Weise die Einzelteile der Kanalstrebe aufgrund der Länge der Verbindungsmuffe verhältnismäßig klein ausge­bildet sein.Since the connecting sleeve 4 can be made practically indefinitely long with the internal thread produced according to the invention, there is a particularly reliable connecting sleeve which improves the buckling stability of the threaded spindles of channel struts. At the same time, the individual parts of the channel strut can be made relatively small due to the length of the connecting sleeve.

Claims (8)

1. Verfahren zur spanlosen Formung eines Gewindes in der einen Seite bzw. Mantelfläche eines rohrförmigen, zylindrischen Grundkörpers, insbesondere einer Muffe, dadurch gekennzeichnet, daß in die jeweils andere Seite des Grundkörpers Gewindegänge eingeformt wer­den, deren durch entsprechende Verformung der jeweils anderen Seite entstehendes Abbild das zu formende Gewinde bildet.1. A process for the non-cutting formation of a thread in one side or lateral surface of a tubular, cylindrical base body, in particular a sleeve, characterized in that threads are formed in the other side of the base body, the image of which is formed by corresponding deformation of the other side forms the thread to be formed. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Gewinde auf der Innenseite (11) des Grundkör­pers gebildet wird und daß die Gewindegänge in die Außenseite (8) vorzugsweise im Rahmen einer Kaltum­formung durch Walzen, Rollen, Drücken oder dergleichen eingeformt werden.2. The method according to claim 1, characterized in that the thread is formed on the inside (11) of the base body and that the threads in the outside (8) are preferably formed in the course of cold forming by rolling, rolling, pressing or the like. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeich­net, daß die Grundform des durch die Gewindegänge der anderen Seite bzw. der Außenseite (8) des Grund­körpers gebildeten Gewindeprofils als Gegenprofil für eine Schraubverbindung benutzt wird.3. The method according to claim 1 or 2, characterized in that the basic shape of the through the threads the other side or the outside (8) of the base body formed thread profile is used as a counter profile for a screw connection. 4. Rohrkörper mit Innengewinde nach Art eines angenäherten Grundgewindes, insbesondere Verbindungsmuffe (4), da­durch gekennzeichnet, daß das Gewinde das Abbild einer außenseitig aufgebrachten gewindeartigen Verformung, beispielsweise Kaltumformung ist.4. tubular body with internal thread in the manner of an approximate basic thread, in particular connecting sleeve (4), characterized in that the thread is the image of an externally applied thread-like deformation, for example cold forming. 5. Rohrkörper nach Anspruch 4, dadurch gekennzeichnet, daß in die Verbindungsmuffe (4) von den Stirnseiten ausgehende, gegenläufige Gewinde eingeformt sind, die sich jeweils vorzugsweise bis zur Mitte der Verbindungs­muffe (4) erstrecken.5. Pipe body according to claim 4, characterized in that in the connecting sleeve (4) starting from the end faces, opposing threads are formed, each preferably extending to the middle of the connecting sleeve (4). 6. Rohrkörper mit Außengewinde nach Art eines angenäherten Rundgewindes, dadurch gekennzeichnet, daß das Außenge­winde das Abbild einer innenseitig aufgebrachten ge­windeartigen Verformung, vorzugsweise Kaltumformung ist.6. tubular body with external thread in the manner of an approximate round thread, characterized in that the external thread is the image of an internally applied thread-like deformation, preferably cold forming. 7. Anwendung eines Rohrkörpers nach Anspruch 4 bei einer Ge­windeverbindung zwischen zwei zylindrischen, insbeson­dere rohrartigen Bauteilen, beispielsweise Teilen eines Gebirgsankers, einer Bohrstange oder dergleichen, wobei die miteinander zu verbindenden Endabschnitte der Bauteile ein Außengewinde aufweisen, dessen Ge­windeprofil der Grundform der in die Außenseite des die Verbindungsmuffe (4) bildenden Rohrkörpers einge­brachten gewindeartigen Verformung entspricht.7. Use of a tubular body according to claim 4 in a threaded connection between two cylindrical, in particular tubular components, for example parts of a rock bolt, a boring bar or the like, wherein the end sections of the components to be connected to one another have an external thread, the thread profile of the basic shape of which in the outside of the the connecting sleeve (4) forming the tubular body introduced thread-like deformation corresponds. 8. Anwendung eines Rohrkörpers nach den Ansprüchen 4 und 5 bei einer Gewindeverbindung zwischen zwei zylindrischen, insbesondere rohrartigen Bauteilen, beispielsweise den Gewindespindeln einer Kanalstrebe, wobei die miteinan­ der zu verbindenden Endabschnitte der Gewindespindeln ein Außengewinde aufweisen, dessen Gewindeprofil der Grundform der in die Außenseite des die Verbindungs­muffe (4) bildenden Rohrkörpers eingebrachten gewinde­artigen Verformung entspricht.8. Use of a tubular body according to claims 4 and 5 in a threaded connection between two cylindrical, in particular tubular components, for example the threaded spindles of a channel strut, the miteinan the end sections of the threaded spindles to be connected have an external thread, the thread profile of which corresponds to the basic shape of the thread-like deformation introduced into the outside of the tubular body forming the connecting sleeve (4).
EP87118889A 1987-01-13 1987-12-19 Thread-forming method and tubular body provided with a thread Expired - Lifetime EP0274719B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87118889T ATE90891T1 (en) 1987-01-13 1987-12-19 METHOD OF FORMING A THREAD AND THREADED PIPE BODY.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873700758 DE3700758A1 (en) 1987-01-13 1987-01-13 METHOD FOR SHAPING A THREAD AND TUBULAR BODY WITH THREAD
DE3700758 1987-01-13

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EP0274719A2 true EP0274719A2 (en) 1988-07-20
EP0274719A3 EP0274719A3 (en) 1989-12-20
EP0274719B1 EP0274719B1 (en) 1993-06-23

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EP87118889A Expired - Lifetime EP0274719B1 (en) 1987-01-13 1987-12-19 Thread-forming method and tubular body provided with a thread

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EP (1) EP0274719B1 (en)
JP (1) JPH069719B2 (en)
AT (1) ATE90891T1 (en)
AU (1) AU600070B2 (en)
CA (1) CA1333652C (en)
DE (1) DE3700758A1 (en)
ES (1) ES2041259T3 (en)

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DE4114336A1 (en) * 1991-05-02 1992-11-05 Peri Gmbh METHOD AND DEVICE FOR FITTING THREADED DRIVES ON MULTI-SIDED TUBES
WO1993004257A2 (en) * 1991-08-17 1993-03-04 Gd-Anker Gmbh Drilling pipe
EP0541942A1 (en) * 1991-11-09 1993-05-19 Gd-Anker Gmbh Drill tube
CN113000746A (en) * 2021-02-24 2021-06-22 秦其琪 Thread forming mechanism of thread rolling machine for machining metal shaft body

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KR100315997B1 (en) * 1994-11-25 2002-04-06 마이 품프 오스트리아 게엠베하 Coupling for anchor bar
DE19731055A1 (en) * 1997-07-19 1999-01-21 Dynamit Nobel Ag Device and method for forming a groove structure in a tubular workpiece
JP4644416B2 (en) * 2002-05-10 2011-03-02 北海製罐株式会社 Method and apparatus for external processing of can body
DE102007049606B4 (en) * 2007-10-16 2011-08-25 Karosan GmbH innovative Kanal- und Rohrleitungssanierung, 66557 Method and device for drawing a pipe string composed of short pipes into a drilling channel

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DE4114336A1 (en) * 1991-05-02 1992-11-05 Peri Gmbh METHOD AND DEVICE FOR FITTING THREADED DRIVES ON MULTI-SIDED TUBES
WO1993004257A2 (en) * 1991-08-17 1993-03-04 Gd-Anker Gmbh Drilling pipe
WO1993004257A3 (en) * 1991-08-17 1993-04-01 Gd Anker Gmbh & Co Kg Drilling pipe
US5350024A (en) * 1991-08-17 1994-09-27 Gd-Anker Gmbh Drill pipe
EP0541942A1 (en) * 1991-11-09 1993-05-19 Gd-Anker Gmbh Drill tube
US5388655A (en) * 1991-11-09 1995-02-14 Gruber; Heinz Injection boring anchor with auger blade
CN113000746A (en) * 2021-02-24 2021-06-22 秦其琪 Thread forming mechanism of thread rolling machine for machining metal shaft body
CN113000746B (en) * 2021-02-24 2022-06-24 山东睿煜矿用材料加工有限公司 Thread forming mechanism of thread rolling machine for machining metal shaft body

Also Published As

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DE3700758C2 (en) 1988-11-24
DE3700758A1 (en) 1988-07-21
AU600070B2 (en) 1990-08-02
AU1024688A (en) 1988-07-14
CA1333652C (en) 1994-12-27
ES2041259T3 (en) 1993-11-16
EP0274719A3 (en) 1989-12-20
ATE90891T1 (en) 1993-07-15
JPS63180334A (en) 1988-07-25
JPH069719B2 (en) 1994-02-09
EP0274719B1 (en) 1993-06-23

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