EP0274719B1 - Thread-forming method and tubular body provided with a thread - Google Patents
Thread-forming method and tubular body provided with a thread Download PDFInfo
- Publication number
- EP0274719B1 EP0274719B1 EP87118889A EP87118889A EP0274719B1 EP 0274719 B1 EP0274719 B1 EP 0274719B1 EP 87118889 A EP87118889 A EP 87118889A EP 87118889 A EP87118889 A EP 87118889A EP 0274719 B1 EP0274719 B1 EP 0274719B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thread
- shaping
- connection sleeve
- internal thread
- base body
- 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 17
- 238000007493 shaping process Methods 0.000 claims abstract description 16
- 238000005520 cutting process Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 9
- 230000000295 complement effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 239000011435 rock Substances 0.000 abstract description 9
- 238000003754 machining Methods 0.000 abstract description 6
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 230000001771 impaired effect Effects 0.000 abstract 1
- 230000007774 longterm Effects 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 abstract 1
- 238000007373 indentation Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
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.
- a method for producing an internal thread of a tubular base body according to the preamble of claim 1 in which a relatively thin-walled tube is pushed over an externally threaded, rotatably mounted mandrel, the walls of the Pipe are pressed into the profile of said thread mandrel by a system of externally rotating pressure rollers, so that the latter screws into the tube during its rotational movement.
- This procedure is used for pipes with a wall thickness of 2.0mm to 2.5mm.
- the essential feature of this known method is that the profile of the resulting internal thread is predetermined by the internal mandrel, in the outer profile of which the wall of the tube to be molded is pressed.
- the necessary relative movement between the mandrel and the tube during shaping leads to increasing deformation and, in particular, frictional forces with increasing wall thicknesses, which also results in restrictions with regard to the length of the tube or the internal thread to be produced Apply this procedure.
- a method for producing a heat exchanger tube is known, the outer surface of which is provided with helical recesses which are present on the outside and equally on the inside.
- a tubular base body is moved axially through a support tube arranged in a stationary manner on the outside thereof and simultaneously rotated about its longitudinal axis.
- the support tube is provided in its central region with a recess into which a forming tool designed as a roller projects and, during the movement of the base body, applies the helical deformation through the support tube.
- the internal thread to be produced is only indirectly formed in a non-cutting forming process by the respective forming tool engaging in one side of the tubular base body, since this is formed by the image of an outside deformation that results on the inside.
- the resulting internal thread is produced by a free material displacement which is complementary to the outside indentation and effective on the inside of the tube and forms an image of the outside indentation.
- FR-A-1 373 178 shows, characterized by an internal support or threaded mandrel, has been removed.
- 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.
- both hot and cold forming processes can be used in the production.
- work hardening is the cold forming process.
- the method according to the invention for the production of connecting sleeves which are used in the coupling of extension rods of a rock bolt, a boring rod or the like is particularly advantageous.
- the operating conditions of these components are characterized by an extremely high mechanical load, so that in particular the fact that the preceding forming process has resulted in material hardening has a favorable effect. Due to the heavy soiling to be expected, a round thread or a thread type similar to this must also be used in these components in order 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 those 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.
- 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 an extension rod 5 via a connecting sleeve 4.
- the extension rod 5 carries a threaded section 6.
- Die Extension rod 5 is designed like the end part 1 as a tubular body. In principle, several such extension rods 5 can be placed next to one another and the overall length of the rock bolt can thus 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 end of the borehole at the end of the borehole, to which a rotary hammer or other drive unit is coupled during the drilling operation, has been omitted.
- 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 free material displacement is formed.
- a non-cutting shaping here by cold forming
- 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 free 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 the deformation process on the inside 10 of the threaded sleeve threads 11, whose cross-sectional shape is essentially determined by arcs and which can thus be regarded as a round thread.
- 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 deformation effective on the outside that the threads 11 can function according to the invention as an internal thread with respect to a predetermined external thread, which in the present case 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 have a profile which corresponds qualitatively to that of the outside 7 of the connecting sleeve 4.
- a connecting sleeve 4 with the internal thread produced according to the invention can be made practically any length.
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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)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Ropes Or Cables (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren entsprechend dem Oberbegriff des Anspruchs 1.The invention relates to a method according to the preamble of claim 1.
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 Antriebsaggegrates. Um die leichte Handhabbarkeit dieser Gewindeverbindung angesichts der hohen aufzunehmenden Belastungen auch bei starker Verschmutzung zu ermöglichen, wird üblicherweise 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 simultaneously serve as coupling points for coupling a hammer drill or other drive unit. The easy handling of this threaded connection in view of the high loads to be absorbed To enable 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 herzustellen. Von Nachteil ist hierbei jedoch nicht nur der Umfang der zu leistenden Zerspanungsarbeit, sondern auch die durch das abgespante Werkstoffvolumen bedingte Querschnittsschächung 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. A disadvantage here is not only the scope of the machining work to be performed, but also the cross-sectional weakening 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.
Aus der FR-A-1 373 178 ist ein Verfahren zur Herstellung eines Innengewindes eines rohrförmigen Grundkörpers nach dem Oberbegriff des Anspruchs 1 bekannt, bei welchem ein verhältnismäßig dünnwandiges Rohr über einen, mit Außengewinde versehenen, drehbar gelagerten Gewindedorn geschoben wird, wobei die Wandungen des Rohres durch ein System von außenseitig umlaufenden Drückwalzen in das Profil des genannten Gewindedorns eingedrückt werden, so daß sich letzterer während seiner Drehbewegung in das Rohr hineinschraubt. Dieses Verfahren wird bei Rohren mit einer Wandstärke von 2,0mm bis 2,5mm angewendet. Wesensmerkmal dieses bekanten Verfahrens ist, daß das Profil des sich ergebenden Innengewindes durch den innenseitigen Gewindedorn vorherbestimmt ist, in dessen Außenprofil die Wandung des zu formenden Rohres eingepreßt wird. Die während der Formgebung notwendige Relativbewegung zwischen dem Gewindedorn und dem Rohr führt mit zunehmenden Wandstärken zu zunehmenden Umform- und insbesondere Reibungskräften, woraus sich auch mit Hinblick auf die Länge des Rohres bzw. des herzustellenden Innengewindes Beschränkungen bei der Anwendung dieses Verfahrens ergeben.From FR-A-1 373 178 a method for producing an internal thread of a tubular base body according to the preamble of claim 1 is known, in which a relatively thin-walled tube is pushed over an externally threaded, rotatably mounted mandrel, the walls of the Pipe are pressed into the profile of said thread mandrel by a system of externally rotating pressure rollers, so that the latter screws into the tube during its rotational movement. This procedure is used for pipes with a wall thickness of 2.0mm to 2.5mm. The essential feature of this known method is that the profile of the resulting internal thread is predetermined by the internal mandrel, in the outer profile of which the wall of the tube to be molded is pressed. The necessary relative movement between the mandrel and the tube during shaping leads to increasing deformation and, in particular, frictional forces with increasing wall thicknesses, which also results in restrictions with regard to the length of the tube or the internal thread to be produced Apply this procedure.
Aus der EP-0 099 737 A2 ist ein Verfahren zur Herstellung eines Wärmetauscherrohres bekannt, dessen Mantelfläche mit schraubenlinienförmigen Einformungen versehen ist, die außen- und gleichermaßen innenseitig vorhanden sind. Zur Herstellung dieses Wandungsprofils wird ein rohrförmiger Grundkörper durch ein an der Außenseite desselben anliegendes, ortsfest angeordnetes Stützrohr axial hindurchbewegt und gleichzeitig um seine Längsachse gedreht. Das Stützrohr ist in seinem mittleren Bereich mit einer Ausnehmung versehen, in welche ein als Rolle ausgebildetes Formwerkzeug hineinragt und während der Bewegung des Grundkörpers durch das Stützrohr hindurch die schraubenlinienförmige Verformung aufbringt. In der Nähe des Formgebungswerkzeugs - innerhalb der genannten Öffnung des Stützrohres - befindet sich ein auf die geformte Rille radial einwirkender Stützschuh, der ein Ausbeulen des Grundkörpers als Folge des Formgebungsvorgangs verhindern soll. Auch dieses Verfahren führt aufgrund des genannten Stützrohres mit zunehmener Materialstärke des zu formenden Grundkörpers zu entsprechend zunehmenden Reibungskräften.From EP-0 099 737 A2 a method for producing a heat exchanger tube is known, the outer surface of which is provided with helical recesses which are present on the outside and equally on the inside. To produce this wall profile, a tubular base body is moved axially through a support tube arranged in a stationary manner on the outside thereof and simultaneously rotated about its longitudinal axis. The support tube is provided in its central region with a recess into which a forming tool designed as a roller projects and, during the movement of the base body, applies the helical deformation through the support tube. In the vicinity of the shaping tool - within the aforementioned opening of the support tube - there is a support shoe which acts radially on the shaped groove and is intended to prevent the base body from bulging as a result of the shaping process. Because of the support tube mentioned, this method also leads to correspondingly increasing frictional forces with increasing material thickness of the base body to be molded.
Es ist daher die Aufgabe der Erfindung, ein Verfahren zur spanlosen Formung eines Gewindes eines rohrförmigen Grundkörpers, nämlich einer Verbindungsmuffe für Bohrstangen sowie Gebirgsanker zu konzipieren, welches einfach durchführbar ist und zu einem Bauteil hoher Festigkeit führt.It is therefore the object of the invention to design a method for the non-cutting formation of a thread of a tubular base body, namely a connecting sleeve for boring bars and rock anchors, which is simple to carry out and leads to a component of high strength.
Diese Aufgabe wird bei einem gattungsgemäßen Verfahren durch die kennzeichnenden Merkmale des Anspruchs gelöst.This object is achieved in a generic method by the characterizing features of the claim.
Erfindungswesentlich ist, daß bei einem spanlosen Umformvorgang durch das jeweilige, in die eine Seite des rohrförmigen Grundkörpers eingreifende Umformwerkzeug das herzustellende Innengewinde somit nur mittelbar geformt wird, da dieses durch das sich innenseitig ergebende Abbild einer außenseitigen Verformung gebildet wird. 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. Wesentlich ist somit, daß das sich ergebende Innengewinde durch eine zu der außenseitigen Einformung komplementäre, auf der Innenseite des Rohres wirksame, ein Abbild der außenseitigen Einformung bildende freie Materialverdrängung hergestellt wird. Es wird somit von einem Stand der Technik, der wie z.B. die FR-A-1 373 178 zeigt, durch einen inneren Stütz- bzw. Gewindedorn gekennzeichnet ist, Abstand genommen. Von besonderem Vorteil ist auch, 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 essential to the invention that the internal thread to be produced is only indirectly formed in a non-cutting forming process by the respective forming tool engaging in one side of the tubular base body, since this is formed by the image of an outside deformation that results on the inside. When manufacturing a sleeve, it can thus be assumed that there is a smooth piece of pipe, which is given an internal thread by 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 therefore essential that the resulting internal thread is produced by a free material displacement which is complementary to the outside indentation and effective on the inside of the tube and forms an image of the outside indentation. It is thus known from a prior art, e.g. FR-A-1 373 178 shows, characterized by an internal support or threaded mandrel, has been removed. It is also 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.
Grundsätzlich können bei der Herstellung sowohl Warmumform- als auch Kaltumformverfahren eingesetzt werden. Besonders vorteilhaft, insbesondere aufgrund der erzielbaren geringen Toleranzen sowie der druch die Umformung bedingten Werkstoffverfestigung sind jedoch die Kaltumformverfahren.In principle, both hot and cold forming processes can be used in the production. Particularly advantageous, in particular due to the achievable small tolerances and the deformation caused by the pressure However, work hardening is the cold forming process.
Das erfindungsgemäße Verfahren zur Herstellung von Verbindungsmuffen, die bei der Ankupplung von Verlängerungsstangen eines Gebirgsankers, einer Bohrstange oder dergleichen Verwendung finden, ist besonders vorteilhaft. Die Betriebsbedingungen dieser Bauteile sind durch eine extrem hohe mechanische Belastung charakterisiert, so daß sich insbesondere der Umstand günstig auswirkt, daß der vorangegangene Umformprozeß eine Werkstoffverfestigung zur Folge hat. Auch muß bei diesen Bauteilen 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 Gewindearten 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.The method according to the invention for the production of connecting sleeves which are used in the coupling of extension rods of a rock bolt, a boring rod or the like is particularly advantageous. The operating conditions of these components are characterized by an extremely high mechanical load, so that in particular the fact that the preceding forming process has resulted in material hardening has a favorable effect. Due to the heavy soiling to be expected, a round thread or a thread type similar to this must also be used in these components in order 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 those 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.
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 Verbindungsmuffe;
- Fig. 3 eine Schnittdarstellung der Verbindungsmuffe gemäß Fig. 2 in einer Schnittebene III-III;
- Fig. 4 eine schematische, anhand eines Ausschnittes wiedergegebene Gewindeverbindung.
- Fig. 1 is a partial view of a simultaneously as a boring bar used rock anchor;
- Fig. 2 is an enlarged view of the view of a connecting sleeve;
- 3 shows a sectional illustration of the connecting sleeve according to FIG. 2 in a sectional plane III-III;
- Fig. 4 is a schematic, shown on the basis of a detail threaded connection.
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 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. Auf die Darstellung des im Bereich des bohrlochmündungsseitigen 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
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 als angenähertes Rundgewinde ausgebildet, welches trotz der beim Bohrbetrieb anstehenden starken Verschmutzungen eine problemlose Handhabung ermöglicht. Erfindungsgemäß ist das Innengewinde der Verbindungsmuffe 4 durch ein spanlose Formgebung, hier durch eine Kaltumformung 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 freie 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
Fig. 3 läßt erkennen, daß sich durch den Verformungsprozeß auf der Innenseite 10 der Gewindemuffe 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 ist wesentlich, 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 erfindungsgemäß als Innengewinde bezüglich eines vorgegebenen Außengewindes fungieren können, welches im vorliegenden Fall durch die Gewindeabschnitte 3, 6 gebildet wird.Fig. 3 shows that the deformation process on the
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 Kaltumformungsprozeß hergestellt und weisen 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
Eine Verbindungsmuffe 4 mit dem erfindungsgemäß hergestellten Innengewinde kann praktisch beliebig lang gemacht werden.A connecting
Claims (1)
- Non-cutting method for forming the internal thread (10) of a tubular base body (4), wherein threads (8) are formed in the external side (7) of the base body by means of cylinders or rollers, characterised in that- the base body (4) is intended and dimensioned for using as a connecting sleeve for bore rods as well as for ground anchors,- the internal thread (10) formed according to a type of circular thread is produced by freely displacing material complementary to the shaping on the external side influencing the internal side (11) of the base body and forming a pattern of the external shaping,- wherein the shaping on the external side is formed by individual shapings (8) and smooth, only insignificantly shaped surface sections (9) remain between the individual shapings (8) and,- wherein the depth of the shapings (8) is less than the material thickness of the base body.
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 |
|---|---|---|---|
| DE3700758 | 1987-01-13 | ||
| DE19873700758 DE3700758A1 (en) | 1987-01-13 | 1987-01-13 | METHOD FOR SHAPING A THREAD AND TUBULAR BODY WITH THREAD |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0274719A2 EP0274719A2 (en) | 1988-07-20 |
| EP0274719A3 EP0274719A3 (en) | 1989-12-20 |
| EP0274719B1 true EP0274719B1 (en) | 1993-06-23 |
Family
ID=6318744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87118889A Expired - Lifetime EP0274719B1 (en) | 1987-01-13 | 1987-12-19 | Thread-forming method and tubular body provided with a thread |
Country Status (7)
| Country | Link |
|---|---|
| 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) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007049606A1 (en) * | 2007-10-16 | 2009-04-30 | Karosan Gmbh Innovative Kanal- Und Rohrleitungssanierung | Method and device for drawing a pipe string composed of short pipes into a drilling channel |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4114336A1 (en) * | 1991-05-02 | 1992-11-05 | Peri Gmbh | METHOD AND DEVICE FOR FITTING THREADED DRIVES ON MULTI-SIDED TUBES |
| DE4127249C1 (en) * | 1991-08-17 | 1993-02-04 | Gd-Anker Gmbh, 3370 Seesen, De | |
| DE4136883C2 (en) * | 1991-11-09 | 1993-10-14 | Gd Anker Gmbh & Co Kg | Drill pipe |
| US5888025A (en) * | 1994-11-25 | 1999-03-30 | Mai Pump Austria Gmbh | Coupling for tie rods |
| 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 |
| 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 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1511C (en) * | 1912-02-03 | 1916-09-15 | General Industries Co | Improvement of a method for manufacturing helical corrugated pipes and the helical corrugated pipe manufactured using that improved method |
| DE1014064B (en) * | 1952-09-01 | 1957-08-22 | Rainer Isolierrohr Drossbach | Thread rolling rollers for the production of rolled threads at the ends of sheet metal pipes with a folded longitudinal seam |
| FR1373178A (en) * | 1963-08-14 | 1964-09-25 | M A G Materiels Agra | Improved threading process by roller embossing, means of its production and elements obtained by this process |
| DE2242035A1 (en) * | 1972-08-26 | 1974-02-28 | Eibes Kerb Konus Gmbh | PROCESS FOR MANUFACTURING THREADED SOCKETS |
| EP0092010A1 (en) * | 1982-04-15 | 1983-10-26 | Marc Maury | Shaping of tubes having a turbulence effect for heat exchangers |
| AU1690083A (en) * | 1982-07-15 | 1984-01-19 | Heat Transfer Pty. Ltd. | Forming helical grooves in tubes |
| EP0102407B1 (en) * | 1982-09-03 | 1986-02-19 | Wieland-Werke Ag | Finned tube with internal projections and method and apparatus for its manufacture |
| DE3335163A1 (en) * | 1983-09-28 | 1985-04-04 | Hilti Ag, Schaan | Expanding element for a sleeve-shaped expanding dowel |
| JPS61132230A (en) * | 1984-11-30 | 1986-06-19 | Hitachi Cable Ltd | Manufacturing device of heat transfer tube with internal groove |
| DE8528705U1 (en) * | 1985-10-09 | 1985-11-21 | kabelmetal electro GmbH, 3000 Hannover | Device for forming a helical corrugation |
-
1987
- 1987-01-13 DE DE19873700758 patent/DE3700758A1/en active Granted
- 1987-12-19 AT AT87118889T patent/ATE90891T1/en active
- 1987-12-19 EP EP87118889A patent/EP0274719B1/en not_active Expired - Lifetime
- 1987-12-19 ES ES198787118889T patent/ES2041259T3/en not_active Expired - Lifetime
- 1987-12-23 JP JP62326611A patent/JPH069719B2/en not_active Expired - Lifetime
-
1988
- 1988-01-07 CA CA000556034A patent/CA1333652C/en not_active Expired - Fee Related
- 1988-01-13 AU AU10246/88A patent/AU600070B2/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007049606A1 (en) * | 2007-10-16 | 2009-04-30 | Karosan Gmbh Innovative Kanal- Und Rohrleitungssanierung | Method and device for drawing a pipe string composed of short pipes into a drilling channel |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| AU1024688A (en) | 1988-07-14 |
| ES2041259T3 (en) | 1993-11-16 |
| CA1333652C (en) | 1994-12-27 |
| DE3700758A1 (en) | 1988-07-21 |
| DE3700758C2 (en) | 1988-11-24 |
| EP0274719A2 (en) | 1988-07-20 |
| JPS63180334A (en) | 1988-07-25 |
| ATE90891T1 (en) | 1993-07-15 |
| AU600070B2 (en) | 1990-08-02 |
| JPH069719B2 (en) | 1994-02-09 |
| EP0274719A3 (en) | 1989-12-20 |
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