• 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:
    A device at a drill string component for striking rock drilling comprising a thread for joining another drill string component provided with a complementary thread, the thread having a threaded groove (9) formed by two thread flanks (10, 11) and an intermediate thread bottom (12) and the threaded bulb (9) having a substantially uniform cross-sectional shape along its axial extent. The threaded bottom (12) has at least three surface portions (Y1, Y2, YC) of sub-circular shape, set in an axial section, and said surface portions (Y1, Y2, YC) of sub-circular shape have increasing radii, seen from each thread flank to an intermediate surface portion of thread bottom. The invention also relates to a threaded connection and a drill string component. Fig. 2 76231; 2011-05-20
    公开号:SE1100398A1
    申请号:SE1100398
    申请日:2011-05-20
    公开日:2012-11-21
    发明作者:Alexander Beronius；Leif Nordfeldt
    申请人:Atlas Copco Secoroc Ab；
    IPC主号:
    专利说明:

    U.S. Pat. No. 4,040,756 discloses a threaded joint with inclined threaded tips. However, in the case of the threaded bottoms of the female thread as well as the male thread, these have a continuously curved configuration. The thread bottoms merge evenly, tangentially, into adjacent thread flanks.
    As further examples of the prior art may be mentioned US 6,196,598 and US 4,687,368, the latter of which relates to a more traditional trapezoidal thread.
    It is an object of the present invention to further develop the devices according to the prior art and to provide a device with a drill string component comprising a hinge thread as well as a drill string component and a method in which a resulting resistance is threaded. and thus drilling can be performed with better economy.
    These objects are achieved in a device together with a drill string component as above in that said threaded bottom has at least three surface portions with a sub-circular shape, seen in an axial section, and that said surface portions with a semi-circular shape have increasing radii, seen from each thread flank to an intermediate bottom edge portion .
    This ensures that stress concentrations, which occur in a most sensitive area of the thread, namely in connection with the root area of the pressure flank, will be lower and be equalized compared to what is the case with a conventional thread, regardless of whether it is a thread of trapezoidal type with a partially linearly extending threaded bottom or in the case of a thread with an evenly curved threaded bottom.
    According to the invention, this is achieved with a thread which is economically advantageous to manufacture, since the thread groove has a substantially uniform cross-sectional shape along its extent 76231; 2011-05-20 10 and thus can be produced with conventional manufacturing methods. Utilization of circular shapes of the surface portions entails simple and economically advantageous production. Determination of the distribution of the surface portions with a semi-circular shape in order for the desired stress-reducing effect to be obtained can be done on the basis of conventional calculation methods.
    It should be emphasized that a reduced stress concentration in this area of the threaded bottom is very favorable for the life of the threaded joint, as even small reductions in stress levels in this area lead to better resistance to fatigue failure and thus to thread breakage.
    The features of the invention ensure that the forces which load the pressure flank and which are to be absorbed in the form of internal stresses in the threaded goods are absorbed in a more advantageous manner by adapting the shape of the threaded bottom to reduce stress-increasing shapes. In particular, it has unexpectedly been found that the design according to the invention allows the voltage distribution to be extended to a larger portion close to the surface of the threaded bottom area and thus to reduce the maximum voltage occurring. In the invention according to the invention, the surface portion with a semi-circular shape closest to the pressure flank is followed by a surface portion with a larger radius, or even by several surface portions with successively increasing radii, seen in the direction of an intermediate surface portion of the thread bottom. Relation to a conventional trapezoidal thread is that with a thread profile for a male thread according to the invention, it becomes easier to introduce compressive stresses into the material by ball bombing or another method which plasticizes the material at the micro level, compared with conventional threads. The reason for this is that the accessibility of ejected bullets is better, which leads to smoother and safer treatment of the thread. 76231; 2011-05-20 Suitably, said intermediate surface portion of the thread bottom is a central surface portion of the thread bottom.
    It is preferred that said surface portions with a semi-circular shape merge evenly into each other or into a nearby threaded flank. This means that there are tangential transitions without voltage-inducing angles. It is also preferred that they merge directly into each other without mediating, for example, linear portions, since such transitions do not contribute to voltage level reduction.
    Suitably, a ratio between a radius of a respective surface portion closest to a thread flank and a radius of a central surface portion of the thread bottom amounts to about 0.05 - 0.7, preferably to about 0.3 0.6, and most preferably to 0. , 35 - 0.55.
    In one aspect of the invention, the thread groove, and in particular the thread bottom, is asymmetrical, seen in said axial section. By asymmetric is meant here that the thread bottom seen in the axial section lacks symmetry in relation to an imaginary radial line (indicated by a dashed line at L in Fig. 2) between two adjacent thread embankments.
    In this case, the thread bottom suitably has such a shape that a surface portion with a semicircular shape adjoining a thread flank, which resists the pressure flank, extends further towards a symmetry axis of the drill string component than a surface portion with a sub-circular shape adjoining a thread flank . Suitably, a threaded flank which resists the pressure flank extends further towards the axis of symmetry of the drill string component than does a threaded flank which forms a pressure flank. A ratio between a radius of the surface portion with a semicircular shape adjoining the threaded edge forming a pressure flank and a radius of a surface portion with a semicircular shape adjoining the threaded edge abutting the printing edge is thus in this embodiment greater than 1 and suitably between 1 and 10. 76231; 2011-05-20 It is preferred that the thread flanks have a linear extent seen in an axial section for the drill string component.
    In an embodiment of the invention, the thread is a conical thread, a suitable cone angle for the conical thread being a cone angle of 20 - BW. Preferably, the thread bottom, at least in a surface area adjoining a thread flank, which does not form a pressure flank, is formed with such a depth in relative to a height of a thread tip of the thread that, when tilting a composite threaded joint, contact is established between an adjacent thread tip of the thread thread with a thread bottom of the female thread and contact in said surface area connecting to the other thread flank with a thread tip of said female thread is thereby avoided.
    In this way, it is achieved that the threaded joint is given better properties when drilling with an oblique joint.
    In the case of not insignificant skew resulting from relatively strongly curved boreholes, the risk of fatigue rupture of the threaded connection increases with loss of the drill string in the borehole as a result.
    Through this aspect, it is achieved that, even in the case of oblique threaded connections, contact between the female threads of the female thread with a threaded root portion of the male thread is avoided, whereby contact is thus avoided where the greatest stress concentration arises. Such contact otherwise leads to heating in the contact area, whereby the material hardens and is easily damaged, which tends to entail disadvantages of fatigue failure of the male thread as potential stress concentrations arise at a highly undesirable place.
    By means of the invention it is achieved that voltage reduction and by avoiding contacts in the bottom of the male thread as above can be combined in an advantageous manner, and especially with asymmetrically designed thread grooves the male thread can be designed to satisfy in principle different purposes closest to the respective 76231; 2011-05-20 flank. In this way, the thread can be designed so that a minimum cross-section of the thread can be made larger in comparison with what would be the case with known technology.
    In a particularly preferred aspect, the thread is a male thread for merging with a complementary female thread arranged on another drill string component. However, the thread is also advantageously a female thread for merging with a complementary male thread arranged on another drill string component.
    The invention also relates to a threaded connection comprising a male thread and a female thread, wherein the threaded connection is formed with a device as above.
    The invention further relates to a drill string component from the group: a drill bit, a drill rod, a splice sleeve, a neck adapter, which comprises at least one device according to OVBIJ. .
    BRIEF DESCRIPTION OF THE DRAWINGS In the drawings: Fig. 1 schematically shows different drill string components equipped with devices according to the invention, Fig. 2 a part of an axial section through a threaded joint, Fig. 3 shows a detail of a threaded joint according to Fig. 2 in an oblique condition, Figs. Fig. 4a is a computer simulation of a load situation and the figure shows a partial section through the threaded profile according to the invention with indication of the voltage distribution obtained over the area of and under the thread bottom, Fig. 4b also constitutes a computer simulation of a load situation and the figure shows a partial section through a conventional thread profile indicating the obtained stress distribution over the area of and below the thread bottom. Fig. 5 shows in an axial section a conical threaded joint according to the invention, and 76231; 2011-05-20 Figs. 6a - c and 7a - b show details of a thread according to the invention.
    DESCRIPTION OF EMBODIMENTS The group of drill string components referred to in this invention includes drill bits, drill rods, neck adapters, splice sleeves and transition adapters.
    Fig. 1 shows as an example various drill string components and parts thereof, respectively, with devices according to the invention, namely: a) A drill rod with a male thread as well as with a female thread. b) A neck adapter with a male thread. c) Part of a drill rod with a conical thread. d) Parts of drill rods with a male thread resp. a female thread. e) A drill bit with a female thread. f) A splice sleeve with two female threads.
    The threaded connections are intended for joining drill string components for striking drilling. Inside the drill string components, a flushing channel extends axially throughout for transferring flushing fluid to the drill bit.
    Fig. 2 shows a detail of a threaded joint according to the invention, wherein a first threaded wall 7 and a second threaded wall 7 'are shown belonging to the male thread. A threaded wall for the female thread is denoted by 8. Between the threaded walls 7 and 7 'is located a walking track 9, which receives the threaded wall 8, which has a substantially uniform cross-sectional shape along its extent.
    The thread groove 9 has a thread bottom 12, which has a plurality of interconnecting surface portions with a semi-circular shape, namely a first surface portion Y1 with a radius RA closest to a first thread flank 10, which constitutes a pressure flank, a second surface portion Y2 with a radius RC closest to a second thread flank ll and an intermediate, here central, surface portion YC with a radius RB.
    The surface portions merge evenly, namely tangentially into each other, 76231; 2011-05-20 which is preferred, although there may be linear transitions and also, which is not recommended, uneven transitions with angular steps between the surface portions. The thread flanks form the same angle to an axis of symmetry of the thread. Normally this angle is 350. In some cases other angles may be relevant, eg 45Ü The radius RB of the central surface portion YC is larger than both radii closest to the two thread flanks 10 and 11. Preferably a ratio between RA and RC and RB, respectively, amounts to about 0.05 - 0.70, preferably to about 0.30 - 0.60, and most preferably to 0.35 - 0.55. In this way, the advantages regarding reduced voltage levels are achieved, which are described in the description introduction above.
    In one aspect of the invention, in a surface area adjacent to the second thread flank 11, the thread bottom 12 has such a depth relative to a height of the thread wall 7 'that when the threaded connection is skewed, contact is first established between the thread tip of the thread wall 7' of the thread thread. thread bottom 13 of the female thread.
    An imaginary radial line between two adjacent threaded dikes is denoted by L. A minimum cross-sectional radius by B. 6 denotes a flushing channel.
    This is shown in more detail in Fig. 3, whereby an inclination has arisen between the female thread 3 and the male thread 2. A center axis of the female thread is indicated by a double dashed line while a center axis of the male thread is indicated by a single dotted line. The inclination in Fig. 3 is exaggerated for the sake of clarity, and is indicated by the angle a.
    As can be seen from Fig. 3, contact has thus arisen in the area 13 - 14, which corresponds to contact arising in that the thread tip 14 of the male thread comes into abutment against the thread bottom at 13 of the female thread. In the surface area indicated by 15, which is the area of the root of the male thread of the male thread at the second thread flank 7 ', there is no contact between the female 76231; 2011-05-20 the thread tip of the thread and the thread bottom of the thread thread, which means that burning or pitting in this area is avoided, thus avoiding the accompanying heating of area 15, softening of this and the risk of fatigue damage to the thread thread.
    Fig. 4a shows the obtained voltage distribution over the area of and under a threaded bottom of a male thread 2, which is screwed together with a female thread (not shown). The figure shows a number of lines with the same voltage, the numerical indications (60% - 85%) refer to the percentage of the maximum voltage that occurs at a comparison thread, which is a conventional trapezoidal thread according to Fig. 4b. It should be emphasized that the load conditions are the same for the two comparison objects in Figures 4a and 4b.
    As can be seen from Fig. 4a, the largest stress concentration is located in a superficial area relatively close to the pressure flank 10. The maximum registered stress is slightly above 85% of the maximum stress which occurs during the comparison thread. The figure also shows that the voltage is spread over a large area and that the voltage runs without jumps and irregularities.
    As shown in Fig. 4b, the largest stress concentration is also located here in a relatively small superficial area relatively close to the pressure flank 10. The maximum registered stress at the comparison thread is, of course, 100% by definition. The figure also shows that the voltage is spread over a smaller area.
    A comparison between the results in Figs. 4a and 4b suggests that the maximum tension in the root area of a thread according to the invention has been reduced by upwards of 12-15%. In addition, it appears that the voltage distribution at the conventional thread, despite the higher voltage level, is more 76231; 2011-05-20 10 lO centered, which gives greater material impact at the load.
    This good result for a thread according to the invention is surprising and indicates that a considerable improvement in terms of fatigue strength can be expected with a device according to the invention in comparison with the conventional thread.
    Fig. 5 shows a conical thread according to the invention, with a male thread 2 and a female thread 3. Also in this embodiment, the respective threaded groove has a substantially uniform cross-sectional shape along the extent.
    Fig. 6a shows a detail of a threaded track with two surface portions with a semi-circular shape (with respective radii RA and RB) transiently evenly and directly in each other. Fig. 6b shows a detail of a threaded groove with two surface portions with a semicircular shape (with respective radii RA and RB) passing over each other via a rectilinear portion denoted by X. Fig. 6c shows a detail of a threaded groove with two surface portions with a semicircular shape (with respective radii RA and RC) transiently uneven in each other, i.e. non-tangential transition at the unfilled arrow.
    Fig. 7a shows a detail of a threaded groove with a threaded flank 10 and a surface portion with a semi-circular shape (with radius RA) passing evenly and directly into each other. Fig. 7b shows a detail of a threaded groove with a threaded flank 10 and a surface portion with a semi-circular shape (with radius RA) transiently uneven in each other, i.e. non-tangential transition at the unfilled arrow.
    The invention is applicable to different types of drill string components, and is particularly advantageous for male threads, since at these stress concentrations is particularly important for the service life, simply due to the construction of the threaded threads and relative exposure to loads. Female threads in sleeve form can be designed with greater inherent resistance to load. 76231; 2011-05-20
    权利要求:
    Claims (19)
    [1]
    Device at a drill string component for striking rock drilling comprising a thread for joining another, with a complementary thread provided drill string component, the thread having a thread groove (9) formed by two thread flanks (10, 11), one of which forms a pressure flank in use , and an intermediate thread bottom (12), and wherein the thread groove (9) has a substantially uniform cross-sectional shape along its axial extent, characterized in that said thread bottom (12) has at least three surface portions (Y1, Y2, YC) with a semicircular shape , seen in an axial section, and - that said surface portions (Y1, Y2, YC) with semi-circular shape have increasing radii, seen from each thread flank to an intermediate surface portion of the thread bottom.
    [2]
    Device according to claim 1, characterized in that at least two of said surface portions (Y1, Y2, YC) of semi-circular shape merge evenly and / or directly into each other.
    [3]
    Device according to claim 2 or 3, characterized in that at least one of said surface portions (Y1, Y2) with a semi-circular shape merges evenly and / or directly into an adjacent thread flank.
    [4]
    Device according to any one of the preceding claims, characterized in that a ratio between a radius (RA, RC) of a respective surface portion (Y1, Y2) closest to a thread flank and a radius (RB) of said intermediate surface portion (YC) of the thread bottom ( 12) amounts to about 0.05 - 0.70.
    [5]
    Device according to claim 4, characterized in that said ratio amounts to about 0.30 - 0.60. 76231; 2011-05-20 10 15 20 25 30 12
    [6]
    Device according to claim 5, characterized in that said ratio amounts to 0.35 - 0.55.
    [7]
    Device according to any one of the preceding claims, characterized in that the threaded groove (9) is asymmetrical, seen in said axial section.
    [8]
    Device according to claim 7, characterized in that the walkway bottom (12), in a surface portion (Y1) with a semi-circular shape connecting to a threaded flank (11), which opposes the pressure flank extends further towards an axis of symmetry of the drill string component than a surface portion (Y2) with a semicircular shape connecting to a threaded flank (10), which forms a pressure flank.
    [9]
    Device according to Claim 7 or 8, characterized in that a threaded edge (11) which resists the pressure edge extends further towards an axis of symmetry of the drill string component than does a threaded edge (10) which forms a pressure edge.
    [10]
    Device according to one of Claims 7 to 9, characterized in that a ratio between a radius (RA) of the surface portion (Y1) with a semi-circular shape connecting to the threaded edge (10) forming a pressure edge, and a radius (RC) of a surface portion (Y2) with semi-circular shape connecting to the threaded flank (11), which resists the pressure flank between 1 and 10.
    [11]
    Device according to one of the preceding claims, characterized in that the threaded flanks (10, 11) have a linear extent seen in an axial section of the drill string component.
    [12]
    Device according to one of the preceding claims, characterized in that the thread is a conical thread. 76231; 2011-05-20 10 15 20 25 30 13
    [13]
    Device according to claim 12, characterized in that the conical thread has a cone angle of 20 - 80.
    [14]
    Device according to one of the preceding claims, characterized in that the thread is a male thread for merging with a complementary female thread arranged on another drill string component.
    [15]
    Device according to one of Claims 1 to 13, characterized in that the thread is a female thread for merging with a complementary male thread arranged on another drill string component.
    [16]
    Device according to one of the preceding claims, characterized in that the thread bottom, at least in a surface area adjoining a thread flank, which does not constitute a pressure flank, is designed with such a depth in relation to a height of a thread tip of the thread that, when tilting a composite threaded connection, contact is established between an adjacent thread tip of a male thread with a thread bottom of a complementary female thread, and contact in said surface area connecting to the other thread flank with a thread tip of said female thread is avoided.
    [17]
    Device according to any one of the preceding claims, characterized in that said intermediate surface portion of the thread bottom is a central surface portion of the thread bottom.
    [18]
    Threaded connection comprising a male thread and a female thread, wherein the threaded connection is formed with at least one device according to any one of claims 1 - 17.
    [19]
    A drill string component from the group: a drill rod, a neck adapter, a splice sleeve, a drill bit, a transition adapter, which comprises at least one device according to any one of claims 1 - 17. 76231; 2011-05-20
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1100398A|SE535814C2|2011-05-20|2011-05-20|Threading device, threaded joint and drill string component for striking rock drilling|SE1100398A| SE535814C2|2011-05-20|2011-05-20|Threading device, threaded joint and drill string component for striking rock drilling|
    PCT/SE2012/050523| WO2012161641A1|2011-05-20|2012-05-15|Thread device, thread joint and drill string component for percussive rock drilling|
    EP12790106.4A| EP2710217B1|2011-05-20|2012-05-15|Thread device, thread joint and drill string component for percussive rock drilling|
    KR1020137029802A| KR101902600B1|2011-05-20|2012-05-15|Thread device, thread joint and drill string component for percussive rock drilling|
    RU2013156677/03A| RU2593403C2|2011-05-20|2012-05-15|Threaded device, threaded connection and component of drilling column for percussion drilling of rock|
    AP2013007273A| AP3988A|2011-05-20|2012-05-15|Thread device, thread joint and drill string component for percussive rock drilling|
    PL12790106T| PL2710217T3|2011-05-20|2012-05-15|Thread device, thread joint and drill string component for percussive rock drilling|
    AU2012259491A| AU2012259491B2|2011-05-20|2012-05-15|Thread device, thread joint and drill string component for percussive rock drilling|
    CN201280024479.1A| CN103562485B|2011-05-20|2012-05-15|Screw device, nipple and the upsilonstring components for Churn drill rock|
    CA2835414A| CA2835414C|2011-05-20|2012-05-15|Thread device, thread joint and drill string component for percussive rock drilling|
    US14/119,112| US9611694B2|2011-05-20|2012-05-15|Thread device, thread joint and drill string component for percussive rock drilling|
    ZA2013/07630A| ZA201307630B|2011-05-20|2013-10-14|Thread device, thread joint and drill string component for percussive rock drilling|
    CL2013003087A| CL2013003087A1|2011-05-20|2013-10-25|Device in a drill string component for drilling rocks by percussion, comprising a thread for engaging with another drill string component, with a thread groove with two thread flanks and a groove bottom with curved shaped surfaces; threaded joint; and a drill string component.|
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