• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    22 ABSTRACT: A threaded drill string component (2) for percussive drilling, said drill string component (2) and having a central axis (A)a threaded male portion (4) (4'), exhibiting: a proximal end portiona distal end portion (4") having an axially directed,(7), The distal end portion substantially planar impact surface a thread ridge (5) and a thread bottom (6). (4") isformed such that at least a part of a peripheral wall thereof,which is adjoining to the impact surface (7) (in the axial direction), is located at a first distance (Rl)(R2) from thecentral axis exceeding a second distance between thecentral axis and an innermost portion of a wall of the threadbottom, such that an enlarged impact surface is created. Theinvention also relates to a thread joint and a method of manufacture. Fig. 2a 77724=2013121l
    公开号:SE1351494A1
    申请号:SE1351494
    申请日:2013-12-13
    公开日:2015-06-14
    发明作者:Alexander Beronius；Jing James Yao
    申请人:Atlas Copco Secoroc Ab；
    IPC主号:
    专利说明:

    DRILL STRING DEVICE FIELD OF THE INVENTION The invention relates to a threaded drill string component forpercussive drilling, said drill string component having athreaded male portion for joining to a threaded female portionof another drill string component. The invention also relates to a thread joint and a method of manufacturing.
    BACKGROUND OF THE INVENTION In a percussive rock drilling process, a shank adapter, anumber of drill rods and a drill bit are joined togetherthrough thread joints to form a drill string. Percussiveenergy is transferred as impact/shock waves from the rockdrilling machine to the rock through the drill stringcomponents. The shock wave is transferred from component tocomponent through contacting impact surfaces that are normally positioned at each end region of each component.
    When the components are joined together, the thread joints aresubjected to a torque whereby the impact surfaces are pressedtogether because of the normal forces occurring between the pressure flanks of the threads.
    Percussive rock drilling has to be performed during conditionsthat sometimes result in that the drilled holes deviate from astraight line. Hereby the drilling components are subjected tobending moments during operation. These bending moments haveto be counteracted by the threads and by the impact surfaces.Further, these bending moments are alternating during thedrilling process because of the rotation of the drill string.In particular the last thread turn of the male thread issubjected to high stress and wear as a result of these alternating bending moments.
    The counteraction by the threads and by the impact surfaces results in a force balance such that a bending moment on the 77724.20131211 thread joint will be balanced on the one hand at the impactsurface by normal forces on the side of the impact surfacebeing compressed by the bending moment. On the other hand,there will also be a balancing contribution from increasednormal forces on the pressure flanks at an outside of the threaded parts, as seen in the bending direction.
    As an example of the background art US 6,767,l56 Bl could bementioned. This document describes a thread joint wherein themale and female threaded components have mating conicalguiding surfaces that will contact one another during any relative bending.
    AIM AND MOST IMPORTANT FEATURE OF THE INVENTION It is an aim of the present invention to address the abovementioned problem and provide a solution which at leastreduces said problem in respect of a threaded drill stringcomponent for percussive drilling, said drill string componenthaving a central axis and an axially extending threaded maleportion for joining to a threaded female portion of anotherdrill string component, wherein the threaded male portionexhibits: a proximal end portion, a distal end portion havingan axially directed, substantially planar impact surface forabutting a surface of another drill string component, and a substantially helically extending thread ridge and asubstantially helically extending thread bottom.
    The above aim is obtained in that the distal end portion isformed such that at least a part of a peripheral wall thereof, which is adjoining to the impact surface (in the axial direction), is located at a first distance from the centralaxis exceeding a second distance between the central axis andan innermost portion of a wall of the thread bottom, such that an enlarged impact surface is created. 77724.201312l1 In other words, at least a part of said peripheral wall, whichis facing substantially radially out from the central axis, issituated at a distance from the central axis which is greater than the distance from the thread bottom to the central axis.
    Hereby it is been made possible to obtain a larger impactsurface compared to the background art, given that theperipheral wall adjoins in the same manner to the impactsurface as is the case according to the background art. Thisresults in that the bending moment occurring during bending ofa thread joint will be more effectively counteracted by thenormal forces occurring at the impact surface, since a greatermoment arm is allowed to be formed. This in turn also reducesthe magnitude of the normal forces acting on the pressureflanks of the thread ridges. It also reduces amplitudes of thestress change in the thread occurring when rotating a bentcoupling during operation, leading to a lower degree of pulsating load on the threads.
    Altogether the reduced stress results in that a longer workinglife can be expected for drill string components according to the invention.
    As a further explanation, when a bending moment is applied, itis balanced at the impact surface by normal forces that areincreased on the side of the impact surface which is put undercompression by the bending moment. These normal forces will behigher for a given bending moment the smaller the diameter ofthe impact surface is, because they will have a shorter moment arm. On the opposite side of the bent coupling, on the other hand, the normal forces on the impact surface are reduced.
    Further on, also the normal forces acting on the pressureflanks of the thread being at the “outside” of the bend willbe increased during bending and will contribute to the balancing of the bending forces. 77724=20131211 Hereby it is understood that the provision of a larger impact surface, results in that the according to the invention,normal forces acting on said impact surface are reduced andalso that the normal forces acting on the pressure flanks ofthe thread parts being at the outside of the bend will be reduced. In other words, a larger impact surface, having greater outer dimensions, causes a smaller amount ofdeformation in the threaded coupling when it is subjected to abending moment and thereby reduced stress amplitude in the thread.
    The external dimensions of the distal portion are limited byinside dimensions of a threaded female portion of anotherdrill string component to be joined to threaded male portion.These inside dimensions correspond to the inside free diameter described by the innermost parts, of thread being thread tops,turns of a female thread ridge being inside said threaded female portion.
    Normally, a certain play is provided between the female threadtops and the male thread bottoms to avoid unwanted contacttherebetween during operation. It has been found, that inpractice the dimensions of the distal portion can be allowedto exceed an imagined diameter described by the innermostportion of a wall of the thread bottom. A part of this playcan thus be exploited by increasing the dimensions of thedistal end portion without jeopardizing entering of the male thread into the mating female thread.
    An intermediate edge zone, where the peripheral wall adjoinsto the impact surface, is preferably radiused or beveled so asto create a suitable transition between the peripheral walland the impact surface. This is preferred even if atheoretical effect of the invention is higher when said atleast a part of the peripheral wall is allowed to adjoin to the impact surface, in the axial direction, more or less 7772420131211 directly. Having a sharp or almost sharp edge between the peripheral wall and the impact surface, however, results indifficulties in entering the threads into one another and alsoto result in increased tendencies of unwanted edge chipping inuse during the percussive action. For that reason, it isuseful to provide the intermediate edge zone with a radius or a bevel.
    When, according to a first preferred aspect, the peripheralwall of the distal end portion forms a circular cylinder whichin particular has an axis being said central axis, thebenefits of the invention is afforded evenly over theperiphery of the distal portion and thereby evenly during rotation of the drill string.
    In a preferred second aspect of the invention, the threadridge is allowed to extend all the way to the section of theimpact surface in order to form a surface contribution for increased surface area of the impact surface.
    The first and second aspects can be combined, such that anenlarged circular cylindrical distal portion can also exhibita thread ridge, or a part thereof, extending over its axial length.
    Having 100% of the thread ridge extending all the way so as toform said surface area contribution would contribute tohighest degree of balance and normal force reduction in oneaxial section of the male threaded portion. Such aconstruction would, however, be likely to cause negativeimplications in certain embodiments resulting in difficultiesin threading together a male portion according to theinvention with a female portion, since the mating has to beinitiated very carefully. For that reason most often, only a part of a thread ridge is brought to extend along the distal end portion so as to provide impact surface area contribution. 77724.20131211 In particular the thread ridge is reduced in height and/orreduced at its sides at the impact surface section so as toprovide possibilities of smooth entering of the male thread into a female thread.
    It is preferred that said at least a part of the thread ridgecontributes to the impact surface with 15 - 100% of the totalsectional area of the thread ridge, as seen in a section perpendicular to said central axis.
    The surface area of the impact surface exceeds advantageouslyby 4 - 40% a surface area based on an imagined circularsurface of the distal portion having a distance from thecentral axis to the thread bottom as its radius. All in allthis results in possibilities of considerable stress reductions to the elements involved event at the low part of the range.
    The edge of the impact surface is rounded or beveled along itsperiphery. Rounding of the edge for providing a radiused edgeor beveling for providing a chamfer surrounding the impactsurface also is preferred on the one hand for increasing entryof threaded parts into each other and for avoiding edge chipping during operation.
    The component is suitably any one selected from the groupconsisting of a drill rod, a rod adapter and a drill bit. a shank adapter, According to a preferred embodiment of the invention: - said central axis, - a radial line in the impact surface being a central symmetryline of the section of the part of the thread ridge at theimpact surface, and- a radial line through a thread start engagement region of the male thread ridge in a mating female thread ridge at the proximal portion of the male portion, 77724201312ll are included in a radial plane such that the radial linethrough said thread start engagement region is offset about 1800 in respect of said radial line in the impact surface.
    Hereby the part of the male thread ridge which is mostsubjected to stress and wear will be protected by theincreased balancing forces from the thread ridge surfacecontribution being carefully brought to act together with thenormal forces from the most sensitive part of the male threadridge, which part will hereby be subjected to normal forces of lower amplitude.
    It is further advantageous that a radial flushing groove isformed in the impact surface, said radial flushing grooveessentially coinciding with a radial line in the impact surface being said central symmetry line.
    The invention also concerns a thread joint for threaded drillstring components for percussive drilling, said thread jointincluding a threaded male portion and a mating threaded femaleportion, wherein the threaded male portion exhibits: aproximal end portion, a distal end portion having an axiallydirected, substantially planar impact surface for abutting asurface of another drill string component, and a substantiallyhelically extending thread ridge and a substantially helicallyextending thread bottom. The distal end portion is formed suchthat at least a part of a peripheral wall thereof, which isadjoining to the impact surface, is located at a firstdistance from the central axis exceeding a second distancebetween the central axis and an innermost portion of a wall ofthe thread bottom, such that an enlarged impact surface is created.
    Corresponding advantages as above are achieved through the inventive thread joint. 77724.201312ll Features that are subordinate to the inventive drill stringcomponent are also applicable in respect of the inventive thread joint.
    In an inventive method of manufacturing a threaded maleportion of a drill string component for percussive drilling,said drill string component having a central axis and anaxially extending threaded male portion for joining to athreaded female portion of another drill string component,wherein the threaded male portion is provided with: a proximalend portion, a distal end portion having an axially directed,substantially planar impact surface for abutting a surface ofanother drill string component, a substantially helicallyextending thread ridge and a substantially helically extendingthread bottom. The distal end portion is formed such that atleast a part of a peripheral wall thereof is brought to adjointo the impact surface, and is brought to be located at a firstdistance from the central axis exceeding a second distancebetween the central axis and an innermost portion of a wall ofthe thread bottom, such that an enlarged impact surface is created.
    It is preferred that the peripheral wall is brought to adjointo the impact surface over an intermediate radiused or beveled edge zone.
    It is suitable, according to one aspect of the invention, thatthe peripheral wall of the distal end portion is formed into a circular cylinder.
    It is suitable, according to another aspect of the invention,that at least a part of the thread ridge is brought to extend over the distal end portion and adjoin to the impact surface.
    Said at least a part of the thread ridge is suitably formed tocontribute to the impact surface with 15 - 100% of the total 77724201312l1 sectional area of the thread ridge, as seen in a section perpendicular to said central axis.
    Advantages explained in respect of the main and subordinatefeatures related to the inventive component arecorrespondingly obtained in respect of the inventive joint and the inventive method.
    BRIEF DESCRIPTION OF DRAWINGSThe invention will now be described in greater detail by wayof embodiments with reference to the annexed drawings, wherein: Fig. 1 is an axial section through a thread joint according to the invention, Figs. 2a, b and c show different views of a threaded male portion according to the invention, Fig. 3 shows a blank of a threaded male portion according to the invention prior to thread cutting, Fig. 4 shows a corresponding blank of a thread male part according to background art before thread cutting, and Fig. 5 shows a simplified block diagram of a method sequence according to the invention.
    Fig. 6a shows a shank adapter, Fig. 6b shows a drill bit andFig. 6c shows a rod adapter according to the invention.Fig. 7 shows, for comparison, longitudinal sections of parts of treaded male portions according to the invention and according to background art.
    Fig. 8 illustrates a thread ridge of an inventive component.
    DETAILED DESCRIPTION OF EMBODIMENTSThe thread joint 1 in Fig. 1 relates to parts of a first 2 and a second 3 drill string component comprising drill rods to be 77724.20l31211 positioned between a percussive rock drilling machine and a drill bit.
    The first drill string component 2 is provided with a threadedmale portion 4 having a proximal portion 4' and a distalportion 4” being a free end portion of the component. Thethreaded male portion 4 is thread-joined into a sleeve-shapedfemale portion 40 having a mating thread. The threaded maleportion 4 is provided with a helical thread ridge 5 which inthis case is trapezoid-shaped having substantially straightlines defining its flanks as seen in the axial section.Between each turn of the thread ridge 5 there are thread bottoms 6.
    At the end of the male portion its free distal portion 4” hasa substantially planar impact surface 7 which is intended totransfer impact shock waves emanating from the percussive rockdrilling machine (not shown) to the next drill stringcomponent 3 which in turn has a mating impact surface 8. 9indicates a flushing channel extending through the entiredrill string in order to allow transfer of flushing medium such as air or water for flushing purposes to a drill bit.
    A indicates a central symmetry axis of the components and inparticular of the threaded male portion 4. 10 and ll indicatefirst and second rod joints between shaped end parts of therespective first and second drill string components 2 and 3.These end parts can be joined to first and second rod portions12 and 13 respectively through friction welding in a per seknown manner or by any other suitable method. It is alsopossible to form the drill string component including one orboth end parts through conventional machining methods from one single rod blank.
    When the thread joint 1 is subjected to a bending moment M, as shown in Fig. 1, this bending moment will be resisted and 7772420131211 11 balanced by normal forces N¿ between the lower parts of theimpact surfaces 7 and 8 and by normal forces n acting betweenthe pressure flanks at the upper parts of the thread ridge 5.From this it should be understood that increased moment armfor the normal force N¿ results in reduced magnitude of thenormal forces n. For simplicity of explanation, with Nland nis meant only the normal force components depending on thebending moment M. Indeed the thread joint is also subject tonormal force components existing because of the ordinarythreading together of the drill string components. All the existing normal forces contribute to affecting the thread joint.
    Figs. 2a, 2b and 2c illustrate the invention in greaterdetail. Here the entire thread ridge 5 has been allowed toextend all the way to the impact surface 7 of the threadedmale portion 4. This results in that the impact surface isconsiderably increased and in particular that a surface area7' has been added to the impact surface since also the thread ridge material is contributing to the impact surface.
    R2 illustrates a distance from the central symmetry axis A tothe lowest part of the thread bottom 6 whereas Rl illustratesthe distance from the central symmetry axis A to the threadridge top of the thread. Potential surface area from the thread ridge that could potentially contribute to the impactsurface area is thus the sectional area of the thread ridge outside a circle defined with R2 as radius.
    In order to fully have the benefits of the invention,according to one important aspect, the surface areacontribution from the thread ridge is positioned such inrespect of a thread start engagement region 14, wherein theload during bending of the thread joint can be expected to behighest according to the following. 77724.201312l1 12 The bending moment occurring in the rotational position in asection illustrated through the plane P is thus most resistedby the surface area being contributed by the thread ridge whenthe thread ridge contribution to the impact surface is in thecompressed state, which in an advantageous manner reduces thetension on the most sensitive part of the thread when there isa 1800 separation between the centre of the contributed surfaceof the thread ridge and the thread start. Hereby the part ofthe male thread ridge which is most subjected to stress and wear will be protected as is described above.
    In Fig. 2b, 16 indicates with interrupted lines a radial flushgroove which is known per se and is often included in athreaded male portion. This radial flush groove is suitablypositioned so that said plane P passes through it in order tohave as little as possible impact on the integrity of theimpact surface. The aim of the radial flush groove 16 is toallow part of flushing fluid through the flushing channel 9 tofind its way out in the thread joint between the thread ridges for cooling purposes.
    It should be noted that the embodiment in Figs. 2a, 2b and 2cis shown for illustration of the full potential of theinvention. Normally, the edge 15 of the impact surface isbeveled or radiused in order to allow smooth entering of thethreads into one another. Normally, also the top of the thread ridge is reduced in the region of the impact surface.
    The blank shown in Fig. 3 is made such that at the free,distal portion 4"' of the male portion 4 there is adimensional reduction 17 having a radius seen from the centralaxis being between the radius of the thread ridge top and thethread ridge bottom of the completed thread. Thread cutting ofthe blank in Fig. 3 therefore results in that a part of thethread ridge extends over the distal portion 4"' such that, compared to a threaded male portion according to the 77724.2013121l 13 background art, which is illustrated in Fig. 4, there will be an increased area of the impact surface 7.
    In Fig. 4, the distal portion 4" of the blank of the maleportion 4 is given a surface reduction 17 to the radius of the thread bottom.
    Altogether, the result is an increased surface area of theimpact surface for the inventive embodiment of Fig. 3 comparedto the resulting threaded male portion according to the background art as illustrated in Fig. 4.
    The axial length l of the distal portion 4" in Fig. 3 isadvantageously 5 ~ 15 mm and more preferred 8 - 12 mm for a drill string component according to the invention.
    Fig. 5 illustrates a method sequence wherein: Position 20 indicates the start of the sequence.Position 21 indicates providing a blank for a male threadedportion for a drill string component.
    Position 22 indicates cutting a substantially helicallyextending thread ridge, and a substantially helicallyextending thread bottom Position 23 indicates bringing at least a part of the threadridge to extend along the distal end portion so as to therebyprovide a thread ridge surface area contribution for increasedsurface area of the impact surface.
    Position 24 indicates rounding or beveling the intermediateedge zone of the impact surface along its periphery.
    Position 25 indicates joining the part including the threadedmale portion with a rod by friction welding to form a completedrill string component.
    Position 26 indicates the end of the sequence.
    Figs. 6a, 6b and 6c illustrate other examples of drill string components according to the invention, i.e. a shank adapter 77724=201312l1 14 30, a drill bit 3l, and a rod adapter 39 having two opposite threaded male portions.
    Fig. 7 shows, for comparison, a section of a part of a firsttreaded male portion 32 according to the invention and a partof a second treaded male portion 33 according to background art. It should be noted that the heights of the tread ridges are exaggerated for sake of illustration.
    From Fig. 7 it is apparent that a surface area (with diameterDnm) of an impact surface 36 of the distal portion 34 of thefirst threaded portion 32 exceeds a surface area of an impactsurface 37 of the distal portion 35 of the second threaded portion 33.
    The diameter defined by a diameter related to an innermostregion of a thread groove bottom is indicated with DB, The playbetween a ridge top 38 of the female thread ridge (indicatedwith interrupted lines at a diameter DMJ and the innermost region of the male thread groove bottom is %(DM«- DB) = P.
    By increasing the diameter Dm>of the distal portion it hasbeen made possible to reach the area increase of the impactsurface compared to an impact surface area (with diameter dum)since the intermediate edge zone El has been provided with thesame preferred radius r as the intermediate edge zone Ez of thesecond, background art, threaded male portion 33. The distalportion 35 of the second threaded male portion 33 has the samediameter, DB, as the one being related to an innermost region of a thread groove bottom which is thus also DB.
    Fig. 8 shows a thread ridge 41 of an inventive componentwherein the thread is a trapezoidal thread and wherein isillustrated an angle ß of inclination of a pressure flank ofthe thread ridge. The angle B of inclination is suitably lessthan 450, more preferably 250 450 and most preferred 300 - 400. 7772420131211 The invention can be modified within the scope of the annexedclaims. The threaded male portion can have a cylindricalextension as well as conical extension wherein a cone angle ofbetween 2 degrees and 10 degrees is suitable. When used inrespect of a conical thread, the extra surface area cannormally be allowed to be relatively greater because of theinherent simpler entry of the male portion into a matingfemale portion for such thread joints. R2 (compare with Fig.2b) is here, for the conical thread, measured at a positionbeing adjacent to the distal end portion since this is theposition of an innermost part of the thread groove bottom in this case.
    It should be noted that also when the resulting impact surfaceis in practice reduced after beveling or radiusing of the edgeof the impact surface to the extent that the planar impactsurface is smaller than a potential impact surface having aradius (R2) being the distance from the central symmetry axis(A), will indeed exist an enlargement of the impact surfacecompared to what would have resulted in a correspondinglybeveled or radiused impact surface made according to abackground art, since according to the invention, it has beenmade possible to have the radius and bevel of the edge of theimpact surface at a greater distance from said central symmetry axis.
    The thread of the male and female portions are shown anddescribed as helical with trapezoid-shaped ridge section. Itis also within the scope of the invention to use other threadshapes having curved lines defining its flanks such as so called rope threads.
    EXAMPLE:As an example of the invention, an inventive threaded malepart was produced from the blank shown in Fig. 3. The machining operation for producing the thread ridge and the 77724=201312l1 16 thread bottom was in this case not performed over the distalportion, leaving the distal portion intact with a circularcylindrical peripheral surface having a diameter of 52.5 mmwhich adjoins to the impact surface with the intermediate ofan edge zone with a radius of 3 mm. The diameter 52.5 leaves asufficient play in respect of an inner diameter of a mating threaded female part for swift entering of the threads into one another.
    As comparison, the background art threaded part was producedfrom the blank shown in Fig.4. The distal portion also in thiscase has a circular cylindrical peripheral surface having adiameter of 49.5 mm, corresponding to the diameter describedby the thread groove bottom. The circular cylindricalperipheral surface also in this case adjoins to the impact surface with the intermediate of an edge zone with a radius of 3 mm. 77724=2013121l
    权利要求:
    Claims (21)
    [1] 1. l. Threaded drill string component (2) for percussive drilling, said drill string component (2) having a centralaxis (A) and an axially extending threaded male portion (4)for joining to a threaded female portion (40) of another drillstring component, wherein the threaded male portion (4)exhibitsz - a proximal end portion (4'), - a distal end portion (4") having an axially directed,substantially planar impact surface (7) for abutting a surfaceof another drill string component, and- a substantially helically extending thread ridge (5) and asubstantially helically extending thread bottom (6),characterized in - that the distal end portion (4") is formed such that atleast a part of a peripheral wall thereof, which is adjoiningis located to the impact surface (7) (in the axial direction), at a first distance (Rl) from the central axis exceeding a second distance (R2) between the central axis and an innermost portion of a wall of the thread bottom, such that an enlarged impact surface is created.
    [2] 2. Component (2) according to claim l, characterized in thatthe peripheral wall adjoins to the impact surface over an intermediate radiused or beveled edge zone.
    [3] 3. Component (2) according to claim 1 or 2, characterized inthat the peripheral wall of the distal end portion forms a circular cylinder.
    [4] 4. Component (2) according to claim 1, 2 or 3, characterizedin- that at least a part of the thread ridge (5) (4") extends overthe distal end portion and adjoins to the impact surface (7). 77724~201312ll 18
    [5] 5. Component (2) according to claim 4, characterized in thatsaid at least a part of the thread ridge (5) contributes to100% of the total sectional the impact surface (7) with 15 - area of the thread ridge, as seen in a section perpendicular to said central axis.
    [6] 6. Component (2) according to claim 4 or 5, characterized inthat: - said central axis, - a radial line in the impact surface being a central symmetryline of the section of the part of the thread ridge at theimpact surface, and- a radial line through a thread start engagement region ofthe male thread ridge in a mating female thread ridge at theproximal portion of the male portion, are included in a radial plane such that the radial linethrough said thread start engagement region is offset about 1800 in respect of said radial line in the impact surface.
    [7] 7. Component (2) according to any one of the previous claims,characterized in that the surface area of the impact surface(7) exceeds by 4 - 40% a surface area based on an imagined circular surface of the distal portion (4") having a distance from the central axis to the thread bottom as its radius (r).
    [8] 8. Component according to any one of the previous claims,characterized in - that the component is any one selected from the group(2,3), a rod consisting of a drill rod (30), and a drill bit a shank adapter adapter (39) (31).
    [9] 9. Component according to any one of the previous claims,characterized in- that a radial flushing groove is formed in the impact surface. 77724=20131211 19
    [10] 10. Thread joint for threaded drill string components (2,3) for percussive drilling, said thread joint including athreaded male portion (4) and a mating threaded female portion (40), wherein the threaded male portion (4) exhibits:- a proximal end portion (4'), - a distal end portion (4") having an axially directed,substantially planar impact surface (7) for abutting a surfaceof another drill string component, and- a substantially helically extending thread ridge (5) and asubstantially helically extending thread bottom (6),characterized in - that the distal end portion (4") is formed such that atleast a part of a peripheral wall thereof, which is adjoining to the impact surface (7) (in the axial direction), is located at a first distance (R1) from the central axis exceeding a second distance (R2) between the central axis and an innermost portion of a wall of the thread bottom, such that an enlarged impact surface is created.
    [11] 11. Joint according to claim 10, characterized in that theperipheral wall adjoins to the impact surface over an intermediate radiused or beveled edge zone.
    [12] 12. Joint according to claim 10 or 11, characterized in thatthe peripheral wall of the distal end portion forms a circular cylinder.
    [13] 13. Joint according to claim 10, 11 or 12, characterized in ~ that at least a part of the thread ridge (5) extends overthe distal end portion (4") (7). and adjoins to the impact surface
    [14] 14. Joint according to claim 13, characterized in that said at least a part of the thread ridge (5) contributes to the impact surface (7) with 15 - 100% of the total sectional area of the 7772420131211 thread ridge, as seen in a section perpendicular to said central axis.
    [15] 15. Joint according to claim 13 or 14, characterized inthat : - said central axis, - a radial line in the impact surface being a central symmetryline of the section of the part of the thread ridge at theimpact surface, and~ a radial line through a thread start engagement region ofthe male thread ridge in a mating female thread ridge at theproximal portion of the male portion, are included in a radial plane such that the radial linethrough said thread start engagement region is offset about 1800 in respect of said radial line in the impact surface..
    [16] 16. Joint according to any one of claims 10 ~ 15,characterized in that the surface area of the impact surface(7) exceeds by 4 - 40% a surface area based on an imaginedcircular surface of the distal portion (4") having a distance from the central axis to the thread bottom as its radius (r).
    [17] 17. Method of manufacturing a threaded male portion (4) of a drill string component (2) said drill for percussive drilling, string component (2) having a central axis (A) and an axially extending threaded male portion (4) for joining to a threaded female portion (40) of another drill string component, wherein the threaded male portion (4) is provided with:~ a proximal end portion (4'), - a distal end portion (4'”) having an axially directed,substantially planar impact surface (7) for abutting a surfaceof another drill string component, and- a substantially helically extending thread ridge (5) and asubstantially helically extending thread bottom (6),characterized in - that the distal end portion (4") is formed such that at 77724.2013121l 21 least a part of a peripheral wall thereof is brought to adjoin(7), from the central axis exceeding a second to the impact surface and is brought to be located at a first distance (R1) distance (R2) between the central axis and an innermost portion of a wall of the thread bottom, such that an enlarged impact surface is created.
    [18] 18. Method according to claim 17, characterized in that theperipheral wall is brought to adjoin to the impact surface over an intermediate radiused or beveled edge zone.
    [19] 19. Method according to claim 17 or 18, characterized in thatthe peripheral wall of the distal end portion is formed into a circular cylinder.
    [20] 20. Method according to claim 17, 18 or 19, characterized in - that at least a part of the thread ridge (5) is brought toextend over the distal end portion (4") and adjoin to the impact surface (7).
    [21] 21. Method according to claim 20, characterized in that said at least a part of the thread ridge (5) is formed to contribute to the impact surface (7) with 15 - 100% of thetotal sectional area of the thread ridge, as seen in a section perpendicular to said central axis. 7772420131211
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    同族专利:
    公开号 | 公开日
    SE538948C2|2017-02-28|
    WO2015088420A1|2015-06-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE29721748U1|1997-12-09|1998-01-29|Bauer Spezialtiefbau|Tillage tool|
    SE514137C2|1998-03-24|2001-01-08|Sandvik Ab|Threaded joints for striking drilling, male and female part to be included in a threaded joint for striking drilling as well as method for manufacturing a product with a thread to be included in a threaded joint for striking drilling|
    SE516651C2|1999-11-26|2002-02-05|Sandvik Ab|Threaded joints for striking drilling, a trade and a female part|
    SE523940C2|2002-03-12|2004-06-08|Sandvik Ab|Drill bit for rock drilling and a method for manufacturing the drill bit|
    SE531459C2|2006-05-17|2009-04-14|Sandvik Intellectual Property|Hondel and the procedure for the manufacture of female parts|
    DE102008047060B4|2008-09-12|2011-05-26|Tracto-Technik Gmbh & Co. Kg|threaded connection|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1351494A|SE538948C2|2013-12-13|2013-12-13|Drill Corner Order|SE1351494A| SE538948C2|2013-12-13|2013-12-13|Drill Corner Order|
    PCT/SE2014/051408| WO2015088420A1|2013-12-13|2014-11-26|Threaded drill string device, threaded joint and method of manufacturing a threaded male portion for percussive drilling|
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