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WO2003076761A1 - Element de forage pour forage de roches et procede de fabrication dudit element - Google Patents

Element de forage pour forage de roches et procede de fabrication dudit element Download PDF

Info

Publication number
WO2003076761A1
WO2003076761A1 PCT/SE2003/000361 SE0300361W WO03076761A1 WO 2003076761 A1 WO2003076761 A1 WO 2003076761A1 SE 0300361 W SE0300361 W SE 0300361W WO 03076761 A1 WO03076761 A1 WO 03076761A1
Authority
WO
WIPO (PCT)
Prior art keywords
thread
low alloyed
core
shell
steel
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.)
Ceased
Application number
PCT/SE2003/000361
Other languages
English (en)
Inventor
Johan Linden
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.)
Sandvik AB
Original Assignee
Sandvik AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sandvik AB filed Critical Sandvik AB
Priority to AU2003252825A priority Critical patent/AU2003252825A1/en
Publication of WO2003076761A1 publication Critical patent/WO2003076761A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • E21B17/02—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 present invention relates to a drill member for rock drilling and a method for manufacturing a drill member in accordance with the preambles of the appended independent claims.
  • a drill string is intended to be fastened to a shank adapter in a drilling machine via one end surface of a rod or a tube.
  • the other end of the rod or the tube is threaded either to another rod or another tube or a drill bit for percussive drilling.
  • the rod or the tube can also be fastened to the shank adapter or another part with the aid of threaded sleeves.
  • a flushing channel runs through the entire drill string in order to lead flushing medium to the drill bit for removal of drill cuttings.
  • the drill string i.e. bits, rods, tubes, sleeves and shank adapters
  • corrosive attacks This applies especially at drilling underground where water is used as flushing medium and where the environment is moist.
  • Corrosive attacks are especially serious at the most highly stressed parts, i.e. at thread bottoms and reductions.
  • corrosion fatigue arises. This is a usual cause for breakage of the drill string.
  • a low alloyed case hardened steel is used in the drill member. The reason for this is that abrasion and wear of the thread portions have for long been limiting the life spans. As the drilling machines and the drill members have improved these problems have diminished and corrosion fatigue become a limiting factor.
  • the case hardening gives compressive stresses in the surface, which has a certain effect on the mechanical part of the fatigue.
  • the corrosion resistance of the low alloyed steel is however poor and for that reason corrosion fatigue and breakages still occur easily.
  • One method of eliminating corrosion fatigue is to make the rods in stainless steel such as in SE-A-0000521-5.
  • the stainless steel is however relatively soft and consequently has inferior wear resistance than a carburized rod, i.e. it wears out relatively quickly.
  • SE-C2-515 195 and SE-C2-515 294 thread joints for percussive rock drilling are shown. By covering the thread bottoms of the cylindrical external thread with at least one layer of a material with different electrode potential than the underlying steel an increased tool life for the threaded connection is attained.
  • One object of the present invention is to considerably improve the resistance to corrosion fatigue in a drill member for percussive rock drilling.
  • Another object of the present invention is to considerably improve the resistance against corrosion fatigue at sections with reduced thickness of the material in a drill member for percussive rock drilling.
  • Still another object of the present invention is to considerably improve the resistance to corrosion fatigue in thread bottoms in a threaded portion in a drill member for percussive rock drilling.
  • Still another object of the present invention is to provide a method for manufacturing a drill member with improved resistance against corrosion fatigue for percussive rock drilling.
  • Fig. 1A shows a tube and Fig. 1 B shows a rod, both in perspective views.
  • Fig. 2 shows a blank for extrusion in a perspective view.
  • Fig. 3 shows an extruded rod in a perspective view.
  • Fig. 4 shows an axial cross-section of a part machined from the rod in Fig. 3.
  • Fig. 5A shows an axial cross-section of a male portion according to the present invention after machining of the part according to Fig. 4.
  • Fig. 5B shows an enlarged sectional view of the thread in Fig. 5A.
  • Fig. 6 shows a drill rod according to the present invention in an axial cross- section.
  • Fig. 7 shows an axial cross-section of a female portion according to the present invention.
  • the invention relates to a drill member for rock drilling and a method for manufacturing a drill member with a flushing channel for percussive drilling with at least one reduction or a portion 40, 40' with relatively thin thickness of the material, which partly is performed in homogenous stainless steel in order to considerably improve the resistance against corrosion fatigue.
  • the flushing channel is in one case performed in the same stainless steel and therefore corrosion fatigue therein no longer occurs during rock drilling.
  • a drill member is provided for percussive drilling, that is, a male portion 19 (Fig. 5A) or a female portion 26 (Fig. 7) equipped with an external thread 16 and an internal thread 16', respectively.
  • the threads shown are so called cylindrical trapezoidal threads but other thread shapes may be used, for example conical threads or rope threads or a combination of these.
  • the drill member 19 has a through flushing channel 20, through which a flushing medium, generally air or water, is led.
  • the thread 16 comprises thread bottoms 23 and thread crests 24, with thread flanks 21 , 22 provided therebetween.
  • the thread bottoms 23 and the thread crests 24 are both performed in low alloyed steel.
  • the thread 16 has a depth D, which is defined as the perpendicular distance between the thread bottom 23 and the thread crest 24 and the low alloyed portion of the thread has a thickness T after machining.
  • the depth D is generally in the range of 1-4 mm and the outer diameter of the rod is 20-70 mm.
  • the ratio T/D is >1.0, preferably 1.1-4.0, preferably 2.0-2.5.
  • the stainless steel is radially spaced from the bottom of the thread or reduction 40 by a distance A, which is >0 mm, preferably ⁇ 8 mm, most preferably 2-6 mm.
  • the stainless steel has a composition which gives a PRE value >10, preferably 12-17.
  • PRE Pitting Resistance Equivalent and describes the resistance of the alloy against pitting corrosion.
  • the low alloyed steel in the shell 18 has a hardness >500 Vickers, most preferably 650-800 Vickers whereby good wear resistance will be obtained.
  • the hardness can be obtained by making the component in tough hardened steel, by carburizing the surface or surface hardening by for instance induction heating.
  • the low alloyed steel preferably has a composition in weight%
  • a tube 11 is shown and in Fig. 1 B a rod 12 is shown.
  • the tube 11 and the rod 12 are fitted with fine tolerances, for example by shrink fit, into each other to form a blank 13 such as is apparent from Fig. 2 and are fixed by circumferential welds 14 at the ends of the blank.
  • the welds 14 give a protection against oxidation at the interface between the tube 11 and the rod 12 at the subsequent heating.
  • the blank 13 is extruded in hot condition to a composite component 15 with a diameter that is adapted to the desired dimension of a thread 16 for percussive rock drilling (see Fig. 5A).
  • composite component is here meant an extruded tube or an extruded rod of at least two different materials.
  • the composite component in the shown embodiment is made of a rod 15 with a core 17 of stainless steel and a shell 18 of low alloyed steel. From this rod a conventional external thread or male thread 16 for percussive rock drilling is turned, such that both thread bottoms and thread crests and reductions 40 are obtained in the low alloyed shell 18.
  • the core 17' may consist of low alloyed steel and the shell 18' of stainless steel (Fig. 7). From this rod a conventional inner thread or female thread 16' for percussive rock drilling is turned, such that both thread bottoms and thread crests and reductions 40 are in the low alloyed core 17'.
  • the core 17' comprises a through-going flushing channel 20'.
  • the entire thread should consist of a homogenous low alloyed steel to reduce the risk for the thread loosening from the stainless part.
  • the machined ends are carburized in order to give hardness and wear resistance to the flanks of the thread 16, 16'. Coating these portions in order to avoid carburization thereof protects the stainless steel.
  • the machined ends are then friction welded to a hexagonal rod or to a round rod of low alloyed or preferably of stainless steel (see Fig. 6) to a drill rod 25 which finally is hardened and annealed.
  • the threaded end could be welded directly to a rolled rod if the weld and the rod become strong enough. Then there is no need for hardening or annealing of the drill rod.
  • a central flushing channel is drilled.
  • a tube can replace the rod 12 such that the finished extruded composite component 15 is made of a tube such that one doesn't have to drill a hole.
  • the extrusion blank 13 shall have a hole for a mandrel and therefore the rod that will constitute the core instead may be a tube blank or a solid rod that is drilled.
  • Both the male portion 19 and the female portion 26 comprise impact transferring surfaces, that is, the end surface 19A and the bottom surface 26A, respectively.
  • Extrusion blanks 13 were manufactured at tests from tubes 11 of low alloyed steel, with composition 1 , outer diameter 77 mm and inner diameter 53 mm and stainless rod 12, with composition 2 and diameter 53 mm.
  • the blanks were heated to 1150°C and were extruded to a rod with outer diameter of 43 mm.
  • the diameter for the stainless steel was 30 mm.
  • Investigations in optical microscope showed that the metallurgical bond between the low alloyed and the stainless steel was good.
  • male portions 19 were manufactured by means of conventional machining.
  • the thread was of the type T38 with outer diameter 38 mm and had the depth D 2.35 mm.
  • the distance A was 3 mm and the thickness T was 5.35 mm, wherein T/D became about 2.3.
  • male portions were then case hardened, during which the end surfaces of stainless steel were covered by protective paint for avoiding the effects of the carbon containing gaseous atmosphere.
  • the male portions were then friction welded to respective ends of a rolled rod 25, which included a flushing channel. Subsequently a flushing channel was drilled in each male portion and all rods were hardened from 1030°C.
  • the invention relates primarily to drifter rods, i.e. rods with male portions at both ends.
  • drifter rods i.e. rods with male portions at both ends.
  • MF rods By the method according to the present invention.
  • the entire thread is thus performed in low alloyed steel and the stainless steel does not reach the bottom of the thread in the radial direction. In this way the stainless steel constitutes a barrier for corrosion fatigue when the corrosion induced cracks have grown through the low alloyed steel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Abstract

La présente invention concerne un joint fileté en acier pour forage à percussion, au cours duquel de l'eau de rinçage est utilisée, ledit joint comprenant au moins un filet externe (14) ainsi qu'un filet interne (12). Ce filet (16) comporte des flancs de filetage (21, 22) et des parties inférieures de filetage (23) et des crêtes de filetage (24) situées entre les flancs. Ces éléments (19) sont composés d'au moins deux matières différentes. L'élément est réalisé dans un composant composite (15). Les parties inférieures de filetage (23) et les crêtes de filetage (24) sont constituées d'un alliage en acier faiblement allié. Ladite invention a également trait à un procédé de fabrication dudit élément de forage.
PCT/SE2003/000361 2002-03-12 2003-03-05 Element de forage pour forage de roches et procede de fabrication dudit element Ceased WO2003076761A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003252825A AU2003252825A1 (en) 2002-03-12 2003-03-05 Drill member for rock drilling and a method for manufacturing the drill member

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0200728-4 2002-03-12
SE0200728A SE523940C2 (sv) 2002-03-12 2002-03-12 Borrelement för bergborrning och en metod för att tillverka borrelementet

Publications (1)

Publication Number Publication Date
WO2003076761A1 true WO2003076761A1 (fr) 2003-09-18

Family

ID=20287224

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2003/000361 Ceased WO2003076761A1 (fr) 2002-03-12 2003-03-05 Element de forage pour forage de roches et procede de fabrication dudit element

Country Status (3)

Country Link
AU (1) AU2003252825A1 (fr)
SE (1) SE523940C2 (fr)
WO (1) WO2003076761A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100001522A1 (en) * 2006-05-17 2010-01-07 Sandvik Intellectual Property Ab Rock-drilling tool, a drill rod and a coupling sleeve
JP2012172344A (ja) * 2011-02-18 2012-09-10 Mitsubishi Materials Corp 掘削用中空鋼ロッドとその製造方法
CN103008871A (zh) * 2012-12-14 2013-04-03 中国石油集团长城钻探工程有限公司工程服务公司 新型贝马复相钢材料钻杆的摩擦焊接工艺
WO2015088420A1 (fr) * 2013-12-13 2015-06-18 Atlas Copco Secoroc Ab Dispositif fileté de train de tiges de forage, raccord fileté et procédé de fabrication d'une partie mâle filetée pour forage à percussion
US10060206B2 (en) 2010-01-11 2018-08-28 Epiroc Rock Drills Aktiebolag Percussion rock drilling machine and drill rig

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4542846A (en) * 1982-03-16 1985-09-24 Kawasaki Jukogyo Kabushiki Kaisha Method of producing a multiple-wall pipe structure with anticorrosion end protection
WO1997049520A1 (fr) * 1996-06-24 1997-12-31 Sandvik Ab (Publ) Tige de forage soudee par friction et procede de fabrication de cette tige

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4542846A (en) * 1982-03-16 1985-09-24 Kawasaki Jukogyo Kabushiki Kaisha Method of producing a multiple-wall pipe structure with anticorrosion end protection
WO1997049520A1 (fr) * 1996-06-24 1997-12-31 Sandvik Ab (Publ) Tige de forage soudee par friction et procede de fabrication de cette tige

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100001522A1 (en) * 2006-05-17 2010-01-07 Sandvik Intellectual Property Ab Rock-drilling tool, a drill rod and a coupling sleeve
US10060206B2 (en) 2010-01-11 2018-08-28 Epiroc Rock Drills Aktiebolag Percussion rock drilling machine and drill rig
JP2012172344A (ja) * 2011-02-18 2012-09-10 Mitsubishi Materials Corp 掘削用中空鋼ロッドとその製造方法
CN103008871A (zh) * 2012-12-14 2013-04-03 中国石油集团长城钻探工程有限公司工程服务公司 新型贝马复相钢材料钻杆的摩擦焊接工艺
WO2015088420A1 (fr) * 2013-12-13 2015-06-18 Atlas Copco Secoroc Ab Dispositif fileté de train de tiges de forage, raccord fileté et procédé de fabrication d'une partie mâle filetée pour forage à percussion

Also Published As

Publication number Publication date
SE523940C2 (sv) 2004-06-08
SE0200728L (sv) 2003-09-13
SE0200728D0 (sv) 2002-03-12
AU2003252825A1 (en) 2003-09-22

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