CA1333652C - Method of forming a screw thread and tubular body with a screw thread - Google Patents
Method of forming a screw thread and tubular body with a screw threadInfo
- Publication number
- CA1333652C CA1333652C CA000556034A CA556034A CA1333652C CA 1333652 C CA1333652 C CA 1333652C CA 000556034 A CA000556034 A CA 000556034A CA 556034 A CA556034 A CA 556034A CA 1333652 C CA1333652 C CA 1333652C
- Authority
- CA
- Canada
- Prior art keywords
- thread
- connecting sleeve
- screw
- cutting
- deformation
- 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 - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000005520 cutting process Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 8
- 230000000295 complement effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 16
- 238000005553 drilling Methods 0.000 abstract description 14
- 239000011435 rock Substances 0.000 abstract description 11
- 238000007493 shaping process Methods 0.000 abstract description 10
- 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
- 230000002411 adverse Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000005755 formation reaction Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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
Landscapes
- 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 present invention is directed to a method for forming a screw-thread and a tubular body with a screw thread.
The conventional manufacture of an internal thread on a connecting sleeve, which is used as the coupling element for parts of a rock anchor or drilling rod, by shaping, involving cutting, in particular by thread cutting, is characterised by a very large consumption of energy, since considerable cutting work is involved with a rounded thread. Furthermore, in the preparation by cutting of a screw-thread in this instance of use, it is a disadvantage that because of the notching effect, in the basic region of the threaded section, the durability of the connecting sleeve is adversely affected.
According to the invention, a connecting sleeve and a method for its manufacture are proposed, in which the internal thread is made without cutting, by deforming the exterior of the connecting sleeve as a kind of screw-thread so that the copy of this deformation on the inside forms the internal thread to be made. In conjunction with the increase in strength associated with toughening of the material, due to the non-cutting deformation, which generally is cold-deformation, the further advantage is also given that the requisite deformation can be carried out in a single operation, so that the manufacturing costs of such connecting sleeves can be reduced.
It is also an advantage that the external thread of the components to be connected together, cooperating with the internal screw-thread of the connecting sleeve, can have a basic shape which corresponds to the external screw-thread-like deformation of the connecting sleeve.
The conventional manufacture of an internal thread on a connecting sleeve, which is used as the coupling element for parts of a rock anchor or drilling rod, by shaping, involving cutting, in particular by thread cutting, is characterised by a very large consumption of energy, since considerable cutting work is involved with a rounded thread. Furthermore, in the preparation by cutting of a screw-thread in this instance of use, it is a disadvantage that because of the notching effect, in the basic region of the threaded section, the durability of the connecting sleeve is adversely affected.
According to the invention, a connecting sleeve and a method for its manufacture are proposed, in which the internal thread is made without cutting, by deforming the exterior of the connecting sleeve as a kind of screw-thread so that the copy of this deformation on the inside forms the internal thread to be made. In conjunction with the increase in strength associated with toughening of the material, due to the non-cutting deformation, which generally is cold-deformation, the further advantage is also given that the requisite deformation can be carried out in a single operation, so that the manufacturing costs of such connecting sleeves can be reduced.
It is also an advantage that the external thread of the components to be connected together, cooperating with the internal screw-thread of the connecting sleeve, can have a basic shape which corresponds to the external screw-thread-like deformation of the connecting sleeve.
Description
13336~2 Method for forming a screw thread and tubular body with a screw thread The invention relates to a method for the non-cutting shaping of a screw thread in one side or the surface of a tubular body member. The invention also relates to a tubular body with internal threads in the form of an approximately round screw-thread. The tubular body is used in a screw-threaded connection between two cylindrical and especially tubular components, for example, parts of a rock anchor, a drilling rod or the like.
It is customary to connect together the extension rods of rock anchors, drilling rods and the like with screw connections. For this, the two juxtaposed drilling rod or rock anchor parts to be connected together have an external thread and are connected by means of a connecting sleeve having a corresponding internal thread. Especially with drilling rods, these thread sections serve simultaneously as coupling regions for coupling a rock hammer or other driving apparatus.
In order to enable easy handling of these threaded connections in view of the high loads which apply and also with heavy soiling, it is usual to make use of a round thread or an approximately round thread.
It is known to manufacture an internal thread on such connecting sleeves by a cutting process, particularly by screw thread cutters and so on. Not only is the extent of the amount o~ cutting involved a disadvantage, but so also is the ,-* ~
, -2- I333652 transverse weakening of the sleeve caused by the volume of material cut away as well as the notching effect involved in the cutting, particularly at the bottom of the separate thread turns, by which the durability of the sleeve is adversely ; ~ affected.
It is therefore an object of the present invention to provide a method for the non-cutting forming of a screw thread and a tubular body carrying a screw thread, which is easy to carry out or manufacture, is particularly adapted for low manufacturing costs and enables the preparation of a screw connection ensuring high strength. This object, insofar as the method is concerned, is obtained by a method wherein threaded turns are formed in the other side of the body member, the copy of which, arising by corresponding deformation of the other side, produces the screw thread to be formed.
More particularly, the invention provides a non-cutting method for forming an internal thread in a tubular body intended and dimensioned for use as a connecting sleeve for bore rods and ground anchors, said body having an internal surface and an external surface, wherein threads are formed in the external surface of the body by means of cylinders or rollers, characterized in that: a) the internal thread is produced by freely displacing material of the body comple-mentary to the threads on the external surface, as saidthreads on the external surface are being formed, to form an internal thread of approximately circular cross-section having a pattern corresponding to the threads formed on the external surface, b) the threads formed on the external surface of the body are formed in such a way as to leave smooth, only insig-nlficantly shaped surface sections between the individual threads, and c) the depth of the threads formed on the exter-nal surface is less than the material thickness of the body.
It is essential to the invention that, as with the known non-cutting forming process, the screw thread to be made is formed directly by a shaping tool engaging the side of the basic tubular article, since this formation applies in, for .
- 2a -instance, an external shaping contact to the resultant internal formation. In the manufacture of a connecting sleeve, thus a start can be made from a smooth tubular work-piece, which by external forming receives an internal screw-thread, the profile of which is then annealed to a round thread. The measurements of the original smooth-walled starting member are dimensioned dependent upon the measurements of the counter-thread to which the sleeve is to be screwed, so that a minimum clearance is given between the threaded turns when brought into engagement with one another.
It is of particular advantage that the internal thread formed in this way can be made in a single forming step. In comparison to a screw-cutting process the manufacturing costs of a sleeve provided with an internal thread are considerably reduced.
The manufacture of an internal thread in a connecting sleeve wherein the screw thread is formed on the internal side of the body member and then the threaded turns are formed in the external side represents the most important application of the method of the present invention. Fundamentally, all non-cutting formin~ methods can be used in the manufacture, including hot forming and also cold forming methods. It is particularly advantageous, especially in view of the low tolerances to be achieved as well as the strength of the work-piece connected with the shaping, to use a cold forming method.
The features of the method wherein the basic shape of the screw-thread profile formed by the threaded turns of the other side or the external side of the body member is used as the counter profile for a screw connection bring the advantage that the same method of operation can be used for both the manufacture of the internal thread and also for the manufacture of the external thread co-operating with it, where merely the shaping tool must be somewhat adapted for the purposes of adapting to the curved screw thread flanks of the internal thread, as well as for establishing the necessary clearance between the internal and external threads.
It is particularly advantageous to use the method according to the invention in the manufacture of connecting sleeves which are used in the coupling of extension rods to a rock anchor, a drilling rod or the like. In these cases which are characterised by an extremely high mechanical loading, it is particularly effective that the connecting sleeve is strengthened by the proposed shaping process and consequently achieves a high strength. Also, because of the heavy soiling to be expected, a rounded thread or a similar type of thread is preferred, in order to ensure satisfactory handling in the extreme conditions of use. Since the method of manufacture according to the invention is connected with a flow of the material, it is naturally limited - without reference to the - actual shaping contour - to the manufacture of such types of screw-threads in which no sharply angled edges are to be made, as occurs for example with a metric screw thread. Preferably, in the case of drilling rods, the whole outer contour including that of the connecting sleeve, is provided with thread formations, so that with narrow bore-holes the external guidance or discharge of drilling fines is facilitated.
It is very advantageous to use the method according to the present invention in the manufacture of connecting sleeves which are inserted into channel struis. It is particularly advantageous in this connection that the connecting sleeves according to the invention can, in practice be constr w ted to any length. Together with good guidance of the threaded spindles, a most satisfactory constructional shape is also given.
The object explained at the beginning, insofar as it relates to a tubular body provided with a thread as well as a threaded connection as such, is achieved by a tubular body according to the invention as well as a threaded connection also according to the invention.
The invention is more closely described with reference to the embodiment of a threaded connection illustrated in the drawings in which:
Fig. 1 is a partial view of a rock anchor simultaneously used as a drilling rod;
Fig. 2 is an enlarged view in elevation of a connecting sleeve according to the invention;
Fig. 3 is a sectional illustration of the connecting sleeve according to Fig. 2 in a section plane III-III;
Fig. 4 is a diagrammatic threaded connection according to the invention representing one section;
Fig. 5 is a connecting sleeve according to the invention intended for use with a dou~le-sided channel strut.
The bore-hole-side end part of a rock anchor is indicated by 1 in Fig. 1, which is also used as a drilling rod.
This end part 1 is thus a tubular body, which carries a known drill head 2 on its end remote from the drill base. The drill head 2 is provided with a central bore in a manner not shown - 133365~
in the drawing, which serves to guide a drilling medium.
This bore is in communication with the internal space of the end part 1.
The end part 1 or the tubuIar body 1 has a threaded section 3, which is connected by means of a connecting sleeve 4 to an extension rod 5. The extension rod 5 carries a threaded section 6. The extension rod 5 is generally constructed as a tubular body like the end part 1. Basical-ly, several of such extension rods 5 can be connected together and thus the total length of the rock anchor can be adapted to existing requirements over wide limits. Also, the showing of the section of the preceding rock anchor located in the region of the bore-hole-side end, to which a drilling hammer or other driving device is coupled during the drilling operation, has been omitted for reasons of clarity in the drawing.
The screw-thread sections 3,6 illustrated as external threads on the tubular bodies 1,5 as well as the internal thread of the connecting sleeve 4, not shown in Fig. 1 and connected with these, are made as approximately round threads in the embodiment shown, which facilitates trouble-free handling despite the heavy soiling arising during the drilling operatisn. According to the invention, the internal thread of the connecting sleeve 4 is made by a non-cutting shaping, here by a cold-forming operation, in which the connecting sleeve 4 is given the profile shown in ~ig.l, by means of a forming tool on the outside 7, where the internal thread is formed by internally effective displacement of the material complementary to the external profile. Further reference is made to this below in relation to Figs. 2 to 4. As the view of a connecting sleeve 4 shown in Fig. 2 indicates, the outside 7 consists of a helically-shaped wound deformation 8 of approximately arcuate shape in cross-section, where between the separate shaped turns 8, smooth land surface sections 9 which are only slightly deformed remain.
Fig. 3 indicates that, by the shaping process on the inside 10 of the threaded sleeve, screw-threaded turns 11 are ~ formed whose cross-sectional shape agrees essentially with the ~ circular arcs and which can thus be regarded as rounded threads. These thread turns 11 lie directly opposite the formations 8. It is essential for the article of the invention that the formation of these internal threaded turns 11 be controlled at least accurately enough, both as regards the depth of the threads and also in relation to the pitch, by the externally-effective deformation, that the threaded turns 11 can function as internal threads in relation to a given external thread, which in the present case is formed by the threaded sections 3,6.
Fig. 4 shows in this way the effective pairing of the turns of the internal threads of the connecting sleeve 4 on the one hand and the external threads of the threaded secti~n 3 on the other hand. The threaded sections 3,6 are likewise made by a cold forming process and consequently exhibit a profile which corresponds qualitatively to that of the external part 7 of the connecting sleeve 4.
The invention is not limited to its use with connecting sleeves for rock anchors. Fundamentally, it can find advantageous use in all cases in which a tubular starting body has to be provided internally with a round thread or a comparable screw thread.
In Fig. 5, an embodiment of a connecting sleeve 4 is shown, which can be used with a two-sided channel strut formation and is consequently provided with two different, namely counter-handed, threaded sections 12,13. In the end regions of this connecting sleeve, 4 threaded spindles can be i~serted, which serve in a known manner to support the channel walls of an excavation. These threaded spindles have an external profile which corresponds essentially to that of the tubular bodies 1,5 of Fig. 1, (the threaded spindles are not represented for reasons of simplicity in the drawing). In order to carry out, by a relative rotation of the connecting sleeve 4 with respect to the threaded spindles, removal of the latter or their contact with the channel walls which are to ~e supported, the connecting sleeve 4 is provided, in a way, likewise not shown in the drawing, with means for initiating a turning movement. In the simplest case, this auxiliary device can be a hole in which a lever can be inserted. Also a nut or a shaped tube can be welded to the connecting sleeve 4, which serves to allow a turning movement in connection with a corresponding tool. If required, a plastics nut can be cast or pressed into the exterior of the connecting sleeve 4.
Since the connecting sleeve 4 with the internal thread made according to the invention can be made to any practical length, a particularly reliable connecting sleeve which improves the resistance to bending of threaded spindles of channel struts is given. Simultaneously, in this way the separate parts of the channel struts can be made relatively small by reason of the length of the connecting sleeve.
It is customary to connect together the extension rods of rock anchors, drilling rods and the like with screw connections. For this, the two juxtaposed drilling rod or rock anchor parts to be connected together have an external thread and are connected by means of a connecting sleeve having a corresponding internal thread. Especially with drilling rods, these thread sections serve simultaneously as coupling regions for coupling a rock hammer or other driving apparatus.
In order to enable easy handling of these threaded connections in view of the high loads which apply and also with heavy soiling, it is usual to make use of a round thread or an approximately round thread.
It is known to manufacture an internal thread on such connecting sleeves by a cutting process, particularly by screw thread cutters and so on. Not only is the extent of the amount o~ cutting involved a disadvantage, but so also is the ,-* ~
, -2- I333652 transverse weakening of the sleeve caused by the volume of material cut away as well as the notching effect involved in the cutting, particularly at the bottom of the separate thread turns, by which the durability of the sleeve is adversely ; ~ affected.
It is therefore an object of the present invention to provide a method for the non-cutting forming of a screw thread and a tubular body carrying a screw thread, which is easy to carry out or manufacture, is particularly adapted for low manufacturing costs and enables the preparation of a screw connection ensuring high strength. This object, insofar as the method is concerned, is obtained by a method wherein threaded turns are formed in the other side of the body member, the copy of which, arising by corresponding deformation of the other side, produces the screw thread to be formed.
More particularly, the invention provides a non-cutting method for forming an internal thread in a tubular body intended and dimensioned for use as a connecting sleeve for bore rods and ground anchors, said body having an internal surface and an external surface, wherein threads are formed in the external surface of the body by means of cylinders or rollers, characterized in that: a) the internal thread is produced by freely displacing material of the body comple-mentary to the threads on the external surface, as saidthreads on the external surface are being formed, to form an internal thread of approximately circular cross-section having a pattern corresponding to the threads formed on the external surface, b) the threads formed on the external surface of the body are formed in such a way as to leave smooth, only insig-nlficantly shaped surface sections between the individual threads, and c) the depth of the threads formed on the exter-nal surface is less than the material thickness of the body.
It is essential to the invention that, as with the known non-cutting forming process, the screw thread to be made is formed directly by a shaping tool engaging the side of the basic tubular article, since this formation applies in, for .
- 2a -instance, an external shaping contact to the resultant internal formation. In the manufacture of a connecting sleeve, thus a start can be made from a smooth tubular work-piece, which by external forming receives an internal screw-thread, the profile of which is then annealed to a round thread. The measurements of the original smooth-walled starting member are dimensioned dependent upon the measurements of the counter-thread to which the sleeve is to be screwed, so that a minimum clearance is given between the threaded turns when brought into engagement with one another.
It is of particular advantage that the internal thread formed in this way can be made in a single forming step. In comparison to a screw-cutting process the manufacturing costs of a sleeve provided with an internal thread are considerably reduced.
The manufacture of an internal thread in a connecting sleeve wherein the screw thread is formed on the internal side of the body member and then the threaded turns are formed in the external side represents the most important application of the method of the present invention. Fundamentally, all non-cutting formin~ methods can be used in the manufacture, including hot forming and also cold forming methods. It is particularly advantageous, especially in view of the low tolerances to be achieved as well as the strength of the work-piece connected with the shaping, to use a cold forming method.
The features of the method wherein the basic shape of the screw-thread profile formed by the threaded turns of the other side or the external side of the body member is used as the counter profile for a screw connection bring the advantage that the same method of operation can be used for both the manufacture of the internal thread and also for the manufacture of the external thread co-operating with it, where merely the shaping tool must be somewhat adapted for the purposes of adapting to the curved screw thread flanks of the internal thread, as well as for establishing the necessary clearance between the internal and external threads.
It is particularly advantageous to use the method according to the invention in the manufacture of connecting sleeves which are used in the coupling of extension rods to a rock anchor, a drilling rod or the like. In these cases which are characterised by an extremely high mechanical loading, it is particularly effective that the connecting sleeve is strengthened by the proposed shaping process and consequently achieves a high strength. Also, because of the heavy soiling to be expected, a rounded thread or a similar type of thread is preferred, in order to ensure satisfactory handling in the extreme conditions of use. Since the method of manufacture according to the invention is connected with a flow of the material, it is naturally limited - without reference to the - actual shaping contour - to the manufacture of such types of screw-threads in which no sharply angled edges are to be made, as occurs for example with a metric screw thread. Preferably, in the case of drilling rods, the whole outer contour including that of the connecting sleeve, is provided with thread formations, so that with narrow bore-holes the external guidance or discharge of drilling fines is facilitated.
It is very advantageous to use the method according to the present invention in the manufacture of connecting sleeves which are inserted into channel struis. It is particularly advantageous in this connection that the connecting sleeves according to the invention can, in practice be constr w ted to any length. Together with good guidance of the threaded spindles, a most satisfactory constructional shape is also given.
The object explained at the beginning, insofar as it relates to a tubular body provided with a thread as well as a threaded connection as such, is achieved by a tubular body according to the invention as well as a threaded connection also according to the invention.
The invention is more closely described with reference to the embodiment of a threaded connection illustrated in the drawings in which:
Fig. 1 is a partial view of a rock anchor simultaneously used as a drilling rod;
Fig. 2 is an enlarged view in elevation of a connecting sleeve according to the invention;
Fig. 3 is a sectional illustration of the connecting sleeve according to Fig. 2 in a section plane III-III;
Fig. 4 is a diagrammatic threaded connection according to the invention representing one section;
Fig. 5 is a connecting sleeve according to the invention intended for use with a dou~le-sided channel strut.
The bore-hole-side end part of a rock anchor is indicated by 1 in Fig. 1, which is also used as a drilling rod.
This end part 1 is thus a tubular body, which carries a known drill head 2 on its end remote from the drill base. The drill head 2 is provided with a central bore in a manner not shown - 133365~
in the drawing, which serves to guide a drilling medium.
This bore is in communication with the internal space of the end part 1.
The end part 1 or the tubuIar body 1 has a threaded section 3, which is connected by means of a connecting sleeve 4 to an extension rod 5. The extension rod 5 carries a threaded section 6. The extension rod 5 is generally constructed as a tubular body like the end part 1. Basical-ly, several of such extension rods 5 can be connected together and thus the total length of the rock anchor can be adapted to existing requirements over wide limits. Also, the showing of the section of the preceding rock anchor located in the region of the bore-hole-side end, to which a drilling hammer or other driving device is coupled during the drilling operation, has been omitted for reasons of clarity in the drawing.
The screw-thread sections 3,6 illustrated as external threads on the tubular bodies 1,5 as well as the internal thread of the connecting sleeve 4, not shown in Fig. 1 and connected with these, are made as approximately round threads in the embodiment shown, which facilitates trouble-free handling despite the heavy soiling arising during the drilling operatisn. According to the invention, the internal thread of the connecting sleeve 4 is made by a non-cutting shaping, here by a cold-forming operation, in which the connecting sleeve 4 is given the profile shown in ~ig.l, by means of a forming tool on the outside 7, where the internal thread is formed by internally effective displacement of the material complementary to the external profile. Further reference is made to this below in relation to Figs. 2 to 4. As the view of a connecting sleeve 4 shown in Fig. 2 indicates, the outside 7 consists of a helically-shaped wound deformation 8 of approximately arcuate shape in cross-section, where between the separate shaped turns 8, smooth land surface sections 9 which are only slightly deformed remain.
Fig. 3 indicates that, by the shaping process on the inside 10 of the threaded sleeve, screw-threaded turns 11 are ~ formed whose cross-sectional shape agrees essentially with the ~ circular arcs and which can thus be regarded as rounded threads. These thread turns 11 lie directly opposite the formations 8. It is essential for the article of the invention that the formation of these internal threaded turns 11 be controlled at least accurately enough, both as regards the depth of the threads and also in relation to the pitch, by the externally-effective deformation, that the threaded turns 11 can function as internal threads in relation to a given external thread, which in the present case is formed by the threaded sections 3,6.
Fig. 4 shows in this way the effective pairing of the turns of the internal threads of the connecting sleeve 4 on the one hand and the external threads of the threaded secti~n 3 on the other hand. The threaded sections 3,6 are likewise made by a cold forming process and consequently exhibit a profile which corresponds qualitatively to that of the external part 7 of the connecting sleeve 4.
The invention is not limited to its use with connecting sleeves for rock anchors. Fundamentally, it can find advantageous use in all cases in which a tubular starting body has to be provided internally with a round thread or a comparable screw thread.
In Fig. 5, an embodiment of a connecting sleeve 4 is shown, which can be used with a two-sided channel strut formation and is consequently provided with two different, namely counter-handed, threaded sections 12,13. In the end regions of this connecting sleeve, 4 threaded spindles can be i~serted, which serve in a known manner to support the channel walls of an excavation. These threaded spindles have an external profile which corresponds essentially to that of the tubular bodies 1,5 of Fig. 1, (the threaded spindles are not represented for reasons of simplicity in the drawing). In order to carry out, by a relative rotation of the connecting sleeve 4 with respect to the threaded spindles, removal of the latter or their contact with the channel walls which are to ~e supported, the connecting sleeve 4 is provided, in a way, likewise not shown in the drawing, with means for initiating a turning movement. In the simplest case, this auxiliary device can be a hole in which a lever can be inserted. Also a nut or a shaped tube can be welded to the connecting sleeve 4, which serves to allow a turning movement in connection with a corresponding tool. If required, a plastics nut can be cast or pressed into the exterior of the connecting sleeve 4.
Since the connecting sleeve 4 with the internal thread made according to the invention can be made to any practical length, a particularly reliable connecting sleeve which improves the resistance to bending of threaded spindles of channel struts is given. Simultaneously, in this way the separate parts of the channel struts can be made relatively small by reason of the length of the connecting sleeve.
Claims
1. A non-cutting method for forming an internal thread in a tubular body intended and dimensioned for use as a connecting sleeve for bore rods and ground anchors, said body having an internal surface and an external surface, wherein threads are formed in the external surface of the body by means of cylinders or rollers, characterized in that:
a) the internal thread is produced by freely displacing material of the body complementary to the threads on the external surface, as said threads on the external surface are being formed, to form an internal thread of approximately circular cross-section having a pattern corresponding to the threads formed on the external surface, b) the threads formed on the external surface of the body are formed in such a way as to leave smooth, only insignificantly shaped surface sections between the individual threads, and c) the depth of the threads formed on the external surface is less than the material thickness of the body.
a) the internal thread is produced by freely displacing material of the body complementary to the threads on the external surface, as said threads on the external surface are being formed, to form an internal thread of approximately circular cross-section having a pattern corresponding to the threads formed on the external surface, b) the threads formed on the external surface of the body are formed in such a way as to leave smooth, only insignificantly shaped surface sections between the individual threads, and c) the depth of the threads formed on the external surface is less than the material thickness of the 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 |
| DEP3700758.0 | 1987-01-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1333652C true CA1333652C (en) | 1994-12-27 |
Family
ID=6318744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000556034A Expired - Fee Related CA1333652C (en) | 1987-01-13 | 1988-01-07 | Method of forming a screw thread and tubular body with a screw 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) |
Families Citing this family (8)
| 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 |
| 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 |
| 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 ES ES198787118889T patent/ES2041259T3/en not_active Expired - Lifetime
- 1987-12-19 AT AT87118889T patent/ATE90891T1/en active
- 1987-12-19 EP EP87118889A patent/EP0274719B1/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
Also Published As
| Publication number | Publication date |
|---|---|
| DE3700758C2 (en) | 1988-11-24 |
| DE3700758A1 (en) | 1988-07-21 |
| EP0274719A2 (en) | 1988-07-20 |
| AU600070B2 (en) | 1990-08-02 |
| AU1024688A (en) | 1988-07-14 |
| 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |