• 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:
    core bit with an exchangeable cutting segment. the present invention relates to a core bit (10), which is rotatable in a direction of rotation (21) around an axis of rotation (22), having: a cutting segment (11; 71) with a annular segment (13), is connected at a first end with one or more cutting elements (14) and at a second end has a first locking element (15), and a drill rod segment (12; 72) with a cylindrical drill rod (16), which has at one end facing the cutting segment (11) a second locking element (17), forming the locking elements (15, 17) in a locking direction parallel to the axis of rotation (22) a snap connection and additionally connectable by at least one pin element (25), which is movable in at least one slot (26) in the form of a slot.
    公开号:BR112015013811B1
    申请号:R112015013811-0
    申请日:2013-12-20
    公开日:2022-01-18
    发明作者:Matthaeus Hoop
    申请人:Hilti Aktiengesellschaft；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a core bit with an exchangeable cutting segment.
    [0002] The term "drill bit" is understood to mean all drilling tools, which have a cylindrical, hollow drill rod and a cutting segment with one or more cutting elements, for example core-cutting bits and cutters. taken. Regardless of the purpose of use, the cutting bits can have additional elements, such as, for example, a depth stop, which limits the drilling depth. Current State of the Technique
    [0003] Core bits consist of a cutting segment with one or several cutting elements, a drill rod segment and a housing segment with snap-in ends. The drill bit is fixed by the socket end in the tool housing of a core drilling apparatus and in the drilling operation of the core drilling apparatus driven in a direction of rotation about an axis of rotation. Known core bits are subdivided into core bits with exchangeable cutting segment and core bits without exchangeable cutting segment, whereas in core bits with exchangeable cutting segment a distinction is made between loosenable and non-releasable connections. A connection is called releasable when the connection can be released by the user without destruction, for example a plug-in connection, a screw connection or a magnetic connection. A connection is designated as non-releasable when the user can only loosen the connection by destroying the connection means, for example a solder connection, a solder connection, a riveting connection or a glue connection.
    [0004] In the core bit described in US 3,888,320 A, the cutting segment and the drill rod segment are connected to each other by a loose fit-rotation connection. The cutting segment comprises an annular segment, which is connected at a first end with several cutting elements and has at a second end an external locking element and an annular stop shoulder. The drill rod segment comprises a cylindrical drill rod, which has at one end facing the cutting segment an interior fitting element with a front area. The mating elements form in a mating direction parallel to the axis of rotation a mating connection. The outer socket element has on the inner side several pin elements, which are radially inwardly directed in a plane perpendicular to the axis of rotation. The inner locking element has several slots in the form of an L-shaped slot, in which the pin elements are inserted. L-shaped notches consist of a transverse slit, which extends perpendicular to the axis of rotation, and a connection slit, which extends parallel to the axis of rotation, which extends perpendicular to the axis of rotation, and a connection slit, which extends parallel to the axis of rotation and connects the transverse slot with a lower edge of the interior fitting element.
    [0005] In the well-known drill bit with exchangeable cutting segment, with closed fit-rotation connection between the cutting segment and the drill rod segment in a direction parallel to the axis of rotation there is an axial clearance. A gap forms between the front area of the inner plug element and the stop ledge of the outer plug element, so that the transmission of force from the drill rod segment to the cutting segment takes place exclusively by the pin elements. The slot also means that a cooling and rinsing medium is not completely transported to the machining location, but can be led to the slot on the inner side of the core bit.
    [0006] Another disadvantage of the known core bit with exchangeable cutting segment manifests itself when the core bit jams in the substrate. During core drilling, it regularly occurs that the core bit during drilling gets stuck in the substrate and has to be released by the operator. In order to release the stuck drill bit, in column-guided core drilling rigs, the drill bit is driven against the direction of rotation and a pulling force is exerted on the drill bit by the drill rig, directed against the direction of rotation. drilling. The operator tries to release the core bit from the substrate by manually rotating it with the aid of a tool wrench and simultaneously pulling it out with the aid of the drill string. In L-shaped notches there is a risk that the operator will rotate the drill rod segment around the axis of rotation until the pin element strikes the connecting slot, and simultaneously activates the drill string hand wheel, so so that the pin element is moved out of the connection slot. As soon as the snap-rotation connection between cutting segment and drill rod segment is loosened, the cutting segment must be released from the substrate in another way, eg by grinding the substrate. Presentation of the Invention
    [0007] The objective of the present invention is to develop a core bit with interchangeable cutting segment, in which the risk is reduced that, when removing a stuck core bit from the substrate, the snap-rotation connection of the drilling elements socket is inadvertently opened and the drill rod segment is removed from the substrate without the cutting segment. In addition, the stability of the drill bit when drilling and the stability against a tensile load by a drill string should be increased.
    [0008] This objective is achieved in the core bit mentioned at the beginning, according to the invention, by the characteristics of the present invention. Advantageous configurations emerge from the embodiments.
    [0009] According to the invention, it is provided that the slot in the form of a slot has a connection slot and a transverse slot with a drag region and a safety region, the drag region being connected on one side of the connection slot facing the direction of rotation, with the connection slot, and the safety region connected, on one side of the connection slot opposite the direction of rotation, with the connection slot.
    [0010] The transmission of torque from the drill rod segment to the cutting segment occurs through the pin elements and the drag region. On the side of the connection slot, opposite the drag region, the safety region is arranged. The safety region reduces the risk that when a stuck core bit is released from the substrate, the snap-turn connection between the drill rod segment and the cutting segment is inadvertently opened. The operator tries to free the stuck drill bit from the substrate by rotating the drill rod segment with the aid of a tool wrench around the axis of rotation and pulling simultaneously with the aid of the drill string. Practice has shown that operators then pull on the drill rod segment, especially when the pin element hits the transverse slot. When the pin element in the drill bit according to the invention hits the drag region or the safety region, there is no risk that the plug-rotation connection will open. In the core bit according to the invention, the plug-rotation connection is only opened when the operator pulls precisely at the moment on the drill rod segment, when the pin element is above the connection slot. The risk of the connection and fitting-rotation inadvertently opening is markedly reduced compared to L-shaped slot notches.
    [0011] Preferably, the height of the connection slot parallel to the axis of rotation is at least 10 mm. With a height of at least 10 mm, sufficient stability of the cutting segment is guaranteed against a pull-out load by a drill string.
    [0012] The height of the connection slot parallel to the axis of rotation, especially preferably, is not more than 13 mm. Up to a height of 13 mm, the stability of the cutting segment in relation to a pull-out request by a drill string is improved. Greater heights have no or only a small influence on the stability of the cutting segment with respect to a pull-up request by a drill string and only result in increased material and machining costs.
    [0013] Preferably, the transverse slot has a distance less than 3 mm from the annular segment parallel to the axis of rotation. With a minimum distance of 3 mm, sufficient stability of the cutting segment is guaranteed in relation to a pull-out load when loosening a stuck core bit with the aid of a drill string.
    [0014] The lower distance of the transverse slit of the annular segment is especially preferably not greater than 5 mm. Up to a distance of 5 mm, the stability of the cutting segment in relation to a pull request is improved. Greater distances have no or only a small influence on the stability of the cut segment with respect to a pull-up request by a drill string and only result in increased material and machining costs.
    [0015] In a preferred execution of the drill bit, the pin elements have a pin height perpendicular to the rotation height, which amounts to between 68% and 89% of the drill rod's shank width. The width of the interior fitting elements is preferably about 50% of the width of the drill rod. With increasing pin height, the area for torque transmission increases. In addition, stability with regard to traction demand is improved.
    [0016] Particularly preferably, the pin elements are made in a circular cylindrical shape with a pin radius, the pin radius being between 2.5 and 5 mm. The transmission of torque from the drill rod segment to the cutting segment takes place through the pin elements and the outer fitting element. The larger the pin radius of the pin elements, the fewer pin elements are required for torque transmission.
    [0017] Preferably, the width of the drag region is not less than the pin radius plus 1.5 mm. With this minimum width for the drag region, sufficient stability of the cutting segment is guaranteed in relation to a pull-out request by a drill string. Pin elements abut the drag region and do not separate from the drag region.
    [0018] The width of the drag region, particularly preferred, is not greater than the pin radius plus 3 mm. Up to a width of half pin diameter plus 3 mm, the stability of the cutting segment with respect to a pull-out request by a drill string is improved. Larger widths have no or only a small influence on the stability of the cutting segment with respect to a pulling load and reduce the stability of the cutting segment unnecessarily.
    [0019] In a first preferred variant, the width of the trailing region and the width of the safety region coincide. The drag region and the safety region have a minimum pin radius width plus 1.5 mm. This execution is offered, above all, for drill bits with large diameters, where the fraction of the transverse crack at the periphery is small.
    [0020] In a second preferred variant, the width of the trailing region is greater than the width of the safe region. The drag region and the safety region have a minimum pin radius width plus 1.5 mm. This execution is especially available for small diameter drill bits, where the fraction of the transverse crack at the periphery is large.
    [0021] In a preferred embodiment, the first locking element is made as an outer locking element with a stop shoulder and the second locking element as an interior locking element with a front area. In the connected state, the front area of the inner locking element abuts the stop shoulder of the outer locking element. The transmission of force from the drill rod segment to the cutting segment occurs when drilling through the front area and the anvil shoulder. The danger of deformation of the outer socket element is reduced when the transmission of force by the pin elements does not take place, so that the core bit according to the invention has greater stability. The stop shoulder can be made annular or in the form of an annular segment. By flat support of the front area on the annular stop shoulder, the core bit is made watertight on the inner side, so that faulty conduction of a cooling and rinsing medium is prevented. The cooling and rinsing medium supplied, for example, by the fitting end to the core bit flows completely through the machining point and provides for a cooling of the cutting elements and a discharge of the perforated fine material.
    [0022] Particularly preferably, the at least one pin element is fixed on the outside of the inner locking element and the outer locking element has the at least one slot-shaped notch. The arrangement of the slotted notches in the exchangeable cutting segment has the advantage that the more unstable of the two piercing core segments is regularly exchanged. The plug-in-rotation connection according to the invention of plug-in elements improves the stability and strength of the core bit with respect to stress and traction. The core bit segment, which has the slots in the form of a slot, is more subject to deformation by tensile stress than the core bit segment, in which the pin elements are fixed. The risk of tensile deformation increases with an increasing fraction of slotted notches on the periphery of the mating element. As the diameter of the outer fitting element is larger than the diameter of the inner fitting element, in the outer fitting element more periphery is available for the slit-shaped notches or the fraction of notches at the periphery is smaller. The core bit is more stable when slot-shaped notches are provided on the outer plug-in element.
    [0023] By the arrangement of the pin elements on the inner fitting element and by the arrangement of the slot-shaped notches on the outer fitting element, the drill bit can be made watertight on the inner side and the faulty conduction of a means of cooling and rinsing. The cooling and rinsing medium, supplied, for example, by the plug-in end of the core bit into a watertight core bit, runs completely to the machining point and provides for cooling of the cutting elements and a discharge of the perforated fine material. The core bit according to the invention also makes it possible for the operator to monitor the opening and closing of the plug-in-rotation connection. This monitoring is not possible, or only to a limited extent, when slot-shaped notches are provided on the inner plug-in element.
    [0024] Particularly preferably, the length of the inner locking element is greater than the length of the outer locking element. Due to the difference in length between the inner and the outer fitting element, it is ensured that the front area of the inner fitting element touches the stop ledge of the outer fitting element and, when drilling, a defined transmission of force from the shank segment occurs. drill for the cutting segment.
    [0025] Particularly preferably, the length of the outer fitting element is at least 18 mm. With a minimum length of 18 mm for the external plug-in element, sufficient stability of the cutting segment is guaranteed. The slot-shaped notches can be positioned on the outer socket element at a height such that the cutting segment is stable with respect to the tensile stresses that occur when a stuck drill bit is released with the aid of a drill string.
    [0026] The length of the outer fitting element, particularly preferably, is not greater than 28 mm. Up to a length of 28 mm for the outer fitting element, the stability of the cutting segment in relation to a pulling load is improved. Longer lengths have no or only a small influence on the stability of the cutting segment with respect to a pulling load and only result in increased material and machining costs.
    [0027] In a preferred embodiment, the outer and the inner fitting element are made annular, the difference between an inner diameter of the outer fitting element and an outer diameter of the inner fitting element being greater than 0.11 mm. By the gap formed between the outer and the inner locking element, it is ensured that the front area of the inner locking element abuts the stop shoulder of the outer locking element. The core bit is made watertight on the inner side, so that the adduction of a liquid and gaseous cooling and rinsing medium to the cutting elements is guaranteed. Furthermore, there is a definite transmission of force from the core drilling apparatus through the frontal area of the drill rod segment to the anvil shoulder of the cutting segment.
    [0028] In a preferred embodiment of the drill bit, two or more pin elements are fixed on the outer side of the inner plug element, and the outer plug element has three or more slot-shaped notches, the number of notches being greater or equal to the number of pin elements. In a core bit according to the invention, the transmission of force from the front area of the inner locking element to the stop shoulder of the inner locking element and the transmission of torque takes place by the pin elements to the outer locking element. The pin elements are then particularly preferably uniformly distributed around the axis of rotation of the core bit. Due to the uniform distribution of the pin elements there is no association between the pin elements and the slots and a pin element can be introduced in each slot.
    [0029] The number of slot-shaped notches must be greater than or equal to the number of pin elements. To close the plug-in-rotation connection, a slot-shaped notch must be provided for each pin element. The execution of a core bit, in which the number of notches is greater than the number of pin elements, has the disadvantage that the stability of the cutting segment is unnecessarily reduced. This execution is suitable, if at all, for core bits with very large diameters, as in these core bits the fraction of notches on the periphery of the outer fitting element is smaller than in core bits with smaller diameters.
    [0030] In a particularly preferred way, six pin elements are fixed on the outside of the inner locking element and the outer locking element has six or more slot-shaped notches. A swivel connection with six plug-in elements, which have a pin diameter of 6 mm, is suitable for transmitting torque to core bits with different diameters, for example from 50 mm to 250 mm.
    [0031] In another execution of the drill bit, the annular segment has a guide segment, connecting the guide segment parallel to the longitudinal axis flush with an external edge, an internal edge or an external and internal edge of the cutting elements . By flush connection of the guide segment to the cutting elements, the guide segment forms, when drilling, a guide for the cutting elements and stabilizes the cutting elements. The guide on the outer side of the drill bit can then be provided by the substrate surrounding the drill hole or on the inside of the drill bit by the drill core.
    [0032] Preferably, the length of the guide segment parallel to the axis of rotation is less than 4 mm. A guide segment, which is smaller than 4 mm, does not prevent - or does not at least essentially prevent - the adduction of a cooling and rinsing medium.
    [0033] In a preferred embodiment of the drill bit, a projection is arranged on the outer side of the inner plug element, and the outer plug element has a groove, the projection and groove in the connected state in the axial direction forming a union connection positive. By the additional positive union connection between the drill rod segment and the cutting segment, the risk of the loose connection between the drill rod segment and the cutting segment inadvertently opening when removing a bit can be further reduced. substrate jammed hole. The formation of the positive connection means such as boss and groove allows a simple and reliable connection, which makes it difficult to extract the drill rod segment from the cutting segment. The retaining force of the connection can be adapted to the area of use of the core bit by the geometry of the boss and groove.
    [0034] Preferably, the projection is arranged in an axial direction between the pin elements and the drill rod and the groove is arranged in an axial direction at the height of the slot-shaped notches. Between the slit-shaped notches of the outer locking element are segments which have an elastic effect. The elastic effect can be adjusted by the number and axial height of the slit-shaped notches and by the length of the outer locking element. In order to separate the drill rod segment from the cutting segment, a force is exerted on the front area of the outer socket element with the aid of a tool in an axial direction. By the action of force, the elastic segment of the outer fitting element is deflected and the positive joint connection between boss and groove can be loosened. The greater the distance of the groove from the stop shoulder of the outer locking element, the greater the deflection of the elastic segment.
    [0035] Particularly preferably, the groove is made annular and arranged in a plane perpendicular to the axis of rotation. An annular groove, which is arranged at the height of the slit-shaped notches, helps the elastic effect of the segments of the outer fitting elements between the slit-shaped notches.
    [0036] The axial direction is defined as a direction parallel to the axis of rotation of the drill bit. In the connected state of the core bits, the axis of rotation of the core bits coincides with the longitudinal axes of the core bits, cutting segment, and core bits. A radial plane is defined as a plane perpendicular to the axis of rotation and a radial direction is a direction, which extends in the radial plane and cuts the axis of rotation of the core bit or the longitudinal axis of the core bits. Examples of Execution
    [0037] Examples of implementation of the invention will be described below based on the drawing. This should represent the execution examples not necessarily in full scale; on the contrary, the drawing serving the purpose of clarification is executed in a schematic and/or slightly deformed form. Regarding the complementation of the teachings that can be inferred directly from the drawing, reference is made to the pertinent current state of the technique. It is therefore worth considering that multiple modifications and alterations can be made as to the form and detail of a form of execution, without departing from the general idea of the invention. The features of the invention presented in the description, the drawing as well as the embodiments may be essential, either individually or in any combination, for carrying out the invention. Furthermore, all combinations of at least two of the features presented in the description, drawing and/or embodiments are included in the scope of the invention. The general idea of the invention is not restricted to the exact form or the detail of the preferred embodiment shown and described below or restricted to an object, which would be restricted in comparison with the object claimed in the embodiments. With the given sizing ranges, values situated within the mentioned limits must also be presented as limit values that can be used at will and can be claimed. For clarity, identical or similar parts or parts with identical or similar function are used below with the same references.
    [0038] Show:
    [0039] Figures 1A, B - a drill bit according to the invention with a cutting segment and a drill rod segment in the unconnected state (Figure 1A) and in the connected state (Figure 1B);
    [0040] Figures 2A, B - the drill rod segment of the drill bit shown in Figure 1 in a longitudinal section along the cutting plane AA in Figure 1A (Figure 2A) and the plug-in element of the drill rod segment in enlarged representation (Figure 2B);
    [0041] Figures 3A, B - the cutting segment of the drill bit shown in Figure 1 in a longitudinal section (Figure 3A) and the fitting element of the cutting segment in an enlarged representation (Figure 3B);
    [0042] Figures 4A, B - the cut segment in a longitudinal section along the cut plane B-B in Figure 1A (Figure 4A) and along the cut plane C-C in Figure 1B (Figure 4B); and
    [0043] Figure 5 - another form of execution of a drill bit according to the invention with a cutting segment and a drill rod segment, which are connected in the axial direction by a positive union connection as security against extraction.
    [0044] Figures 1A, B show a core bit 10 according to the invention with a cutting segment 11, which is connected by a releasable snap-turn connection with a drill rod segment 12. Figure 1A shows the cutting segment 11 and drill rod segment 12 in the unconnected state with open fitting and rotation-connection and Figure 1B the cutting segment 11 and drill rod segment 12 in the connected state with closed fitting-rotation connection .
    [0045] The cutting segment 11 comprises an annular segment 13, which is connected at a first end with several cutting elements 14 and, at a second end, presents a first locking element 15. The first locking element is then executed as outer fitting element 15. The cutting elements 14 are welded, screwed or otherwise fixed with the annular segment 13. The cutting segment 11 can have, instead of several cutting elements 14, a single cutting element executed as a sleeve. cut, which is connected with annular segment 13.
    [0046] The drill rod segment 12 comprises a cylindrical drill rod 16, which has at an end facing the cutting segment 11 a second fitting element 17, and at an end opposite the cutting segment 11 it is connected with a housing segment 18. The second locking element is then realized as an inner locking element 17. The housing segment 18 comprises a cap 19 and a socket end 20. The core bit 10 is secured by the socket end 20 in the tool housing of a core drilling apparatus. In the drilling operation, the drill bit 10 is driven by the core drilling apparatus in a direction of rotation 11 about an axis of rotation 22 and moved in a direction of drilling 23 parallel to the axis of rotation 22 into the substrate. to be processed. The axis of rotation 22 extends coaxially to a longitudinal axis of the drill rod 16 and a longitudinal axis of the annular segment 13. The drill bit 10 has a circular cross section perpendicular to the axis of rotation 22; alternatively, core bits according to the invention may have other suitable cross sections, for example a polygonal cross section.
    [0047] Cutting segment 11 is connected by a snap-turn connection 24 with drill rod segment 12 (Figure 1B). The term "plug-turn connection" means connections of two connecting elements, which form in at least one direction a plug-in connection, the plug-in connection elements being additionally connected by a rotation connection. The plug-in connection and the rotation connection can be closed successively or simultaneously. The socket-rotation connection 24 must connect the cutting segment 11 and the drill rod segment 12 in all translational and rotational directions to each other. The cutting segment 11 must be secured against translations in the drilling direction 23, against the drilling direction 23 and radially to the drilling direction 23 as well as against rotations around the axis of rotation 22.
    [0048] The cutting segment 11 is fitted with the outer mating element 15 over the inner fitting element 17 of the drill rod segment 12, the mating direction of the mating connection extending parallel to the axis of rotation 22. A The plug-in connection of the plug-in elements 15, 17 ensures the cutting segment 11 against translations against the drilling direction 23 and radially to the axis of rotation 22. By the rotational connection of the plug-in elements 15, 17 the cutting segment 11 must be secured against rotation about the axis of rotation 22 and against translation in the drilling direction 23. The rotation connection comprises six pin elements 25, which are inserted into six slot-shaped notches 26. The six pin elements 25 are fixed on the outer side 27 of the inner locking element 17 and the six slot-shaped notches 26 are provided on the outer locking element 15. The pin elements 25 and the notches 26 are arranged evenly distributed around the axis of rotation 22. Due to the uniform distribution there is no association between the pin elements 25 and the notches 26 and a pin element 25 can be inserted in each notch 26.
    [0049] The cutting segment 11 can be easily and quickly connected by the operator with the drill rod segment 12. For this purpose, the cutting segment 11 with the outer plug element 15 can be fitted in such a way on the element socket 17 of the drill rod segment 12 that the pin elements 25 are arranged in the slots 26 in the form of a slot. The cutting segment 11 is moved in the snapping direction and then held by a rotation around the axis of rotation 22.
    [0050] Figures 2A, B show the drill rod segment 12 of the core bit 10 in a longitudinal section along the cutting plane A-A in Figure 1A. Figure 2A then shows the drill rod segment 12 and Figure 2B the second locking element realized as an inner locking element 17 in enlarged representation.
    [0051] The drill rod segment 12 comprises the cylindrical drill rod 16 and the inner fitting element 17, which are executed monolithically. As an alternative to the monolithic design, the inner plug element 17 can be made as a separate part and then connected with the drill rod 16. Pin elements 25 are fixed to the outer side 27 of the inner plug element 17. The pin elements 25 and the inner locking element 17 can be produced from different materials and connected together or consist of the same material and the pin elements 25 are produced by molding process such as stamping or transfer.
    [0052] The drill rod 16 has, perpendicular to the axis of rotation 22, an external diameter da, an internal diameter di and a drill rod width b, b = (da - di)/2. The inner locking element 17 has an outer diameter d2,i perpendicular to the axis of rotation 22. The inner diameter d2,i of the inner plug element 17 then corresponds to the inner diameter di of the drill rod 16 and the outer diameter d2,a of the inner plug element 17 is smaller than the outer diameter of the drill rod 16, so that on the outside of the drill rod segment 12 an annular step is formed.
    [0053] Figure 2B shows the inner locking element 17 in an enlarged representation. The inner locking element 17 comprises an outer side area 31, an inner side area 32 and a front area 33. In the passage from the drill rod 16 to the inner locking element 17 there is an annular stop shoulder 34.
    [0054] The inner locking element 17 has a length I2 parallel to the axis of rotation 22 and perpendicular to the axis of rotation 22 a width b2. The pin element 25 is made in the shape of a circular cylinder with a pin radius Rz parallel to the axis of rotation 22 and a pin height Hz perpendicular to the axis of rotation 22. The lower edge of the pin element 25 is parallel to the axis of rotation. of rotation 22 at a distance Az from the front area 33 of the inner locking element 17.
    [0055] Figures 3A, B show the cutting segment 11 of the core bit 10 shown in Figure 1 in a longitudinal section parallel to the drawing plane of Figure 1A. Figure 3A then shows the total cut segment 11 and Figure 3B a slit-shaped notch 26 in the outer locking element 15 in enlarged representation.
    [0056] The cutting segment 11 comprises the annular segment 13, the cutting elements 14 and the outer fitting element 15. The annular segment 13 and the outer locking element 15 are made monolithic in the embodiment shown. As an alternative to the monolithic design, the outer socket element 15 can be made as a separate part and then connected with the annular segment 13.
    [0057] The cutting elements 14 are arranged in a plane perpendicular to the axis of rotation 22 in the form of a ring around the annular segment 13 and have an external edge 41 and an internal edge 42 respectively. The external edges 41 of the cutting elements 14 form an outer circle with an outer diameter of da and the inner edges an inner circle with an inner diameter of di. The cutting elements 14 produce a perforation hole in the substrate with a perforation hole diameter corresponding to the diameter of the. Inside the drill bit 10 there is a drill core with a drill core diameter corresponding to the inner diameter di. The outer locking element 15 has, perpendicular to the axis of rotation 22, an external diameter di,a and an internal diameter di,i. The outside diameter di,a of the outer socket element 15 is smaller than the outside diameter da and the inside diameter di,i of the outside socket element 15 is greater than the inside diameter di.
    [0058] Figure 3B shows a notch 26 in the form of a slit in the outer locking element 15 in an enlarged representation. The slot-shaped notch 26 consists of a transverse slot 43, which is arranged perpendicular to the axis of rotation 22, and a connecting slot 44, which is arranged parallel to the axis of rotation 22. The connecting slot 44 connects the transverse slot 43 with an upper edge 45 of the outer locking element 15, which is made open at the upper edge 45 in the region of the connection slot 44. The pin elements 25 are introduced through the connection slot 44 into the slot-shaped notch 26 and displaced towards the transverse slot 43 by a rotation about the axis of rotation 22. The transmission of torque from the pin element 25 to the outer socket element 15 takes place in the transverse slot 43.
    [0059] The outer locking element 15 has a length l1 parallel to the axis of rotation 22 and perpendicular to the axis of rotation 22 a width b1 (Figure 4A). The transverse slot 43 has a width B perpendicular to the rotation axis 22 and a height H parallel to the rotation axis 22. The connecting slot 44 has a width b perpendicular to the rotation axis 22 and a height h parallel to the rotation axis 22. The width b of the connecting slot 44 is greater than the pin diameter 2R2 of the pin elements 25, so that the pin elements 25 can be easily introduced into the connecting slot 44. The introduction of the pin elements 25 by a insertion chamfer 46 in the upper edge 45 can then be facilitated. The height h of the connection slot 44 is selected in such a way that the cutting segment 11 has sufficient stability in relation to tensile stresses when releasing a stuck drill bit. If the height h is selected too small, there is a risk of deformation of the outer locking element 15.
    [0060] The transverse slot 43 has, parallel to the axis of rotation 22, a lower distance Ai,u to the annular segment 13 and a higher distance from the upper edge 45, the upper distance corresponding to the height h of the connection slot 44. The lower distance Ai,u of the annular segment 13 is selected in such a way that the cutting segment 11 has sufficient stability with respect to pulling forces by a drill string. If the lower distance Ai,u is selected too small, there is a risk of deformation of the outer socket element 15.
    [0061] The transverse slot 43 comprises a drive region 47, a safety region 48 and a transition region 49. The drag region 47 and the safety region 48 are arranged, with respect to the direction of rotation 21 of the drill bit. 10, on different sides of the connection slot 44, the drag region and the safety region 47, 48 being connected by the transition region 49 with the connection slot 44. The drag region 47 is arranged on the side of the connection slot 44 facing in the direction of rotation 21 and the safety region 48 on the side opposite the direction of rotation 21. The transmission of torque from the drill rod segment 12 to the cutting segment 11 takes place by the pin elements 25 and the drag region 47. The safety region 48 reduces the risk that, upon release of a stuck core bit from the stratum, the socket-rotation connection 24 between the drill rod segment 12 and the cutting segment 11 is inadvertently opened.
    [0062] The drag region 47 has a width B1 perpendicular to the axis of rotation 22, the height of the drag region 47 corresponds to the height H of the transverse slot 43. The safety region 48 has a width B2 perpendicularly to the rotation region 22, the height of the safety region 48 corresponds to the height H of the transverse slot 43. The widths B1, B2 of the drag region 47 and of the safety region 48 are selected in such a way that the pin elements 25, upon a pull request on the transverse slot 43, are preserved and do not break.
    [0063] Figures 4A, B show the cutting segment 11 of the core bit 10 according to the invention in a longitudinal section along the cutting plane BB in Figure 1A (Figure 4A) and along the cutting plane CC in Figure 1B (Figure 4B). The cutting segment 11 comprises the annular segment 13, the cutting elements 14 and the outer locking element 15.
    [0064] The cutting elements 14 are formed of a matrix zone 51 and a neutral zone 52, the matrix zone consisting of a powder material mixed with cutting particles and the neutral zone 52 of a sealable powder material without particles. cutting. The formation of the cutting elements 14 in two parts is required in order to be able to weld the cutting elements 14 with the annular segment 13. The annular segment 13 ends flush with the inner edge 42 of the cutting element 14 and presents, with respect to the outer edge 41 of the cutting element 14, return 53.
    [0065] The annular segment 13 comprises on the inner side a guide segment 54 and a core removal segment 55. The core removal segment 55 has an internal diameter, which decreases towards the cutting elements 14, the inclined area of the core removal segment 55 assists in removing the drill core. The guide segment 54 ends flush with the cutting element 14 and forms, when drilling, a guide for the cutting elements 14; parallel to the axis of rotation 22, the guide segment 54 has a length m. As an alternative to the guide on the inner side of the drill bit 10, the guide segment can be arranged on the outer side or on the outer and inner side. The length m of the guide segment 54 is less than 4 mm. A guide segment, which is smaller than 4 mm, is not - or at least not essentially - an obstacle to the adduction of a cooling and rinsing medium.
    [0066] The outer locking element 15 comprises an outer side area 56, an inner side area 57 and a front area 58. In the transition from the annular segment 13 to the outer locking element 15 there is an annular stop shoulder 59. In the cutting segment 11 shown in Figure 4A, the outer locking element 15 additionally has a sloping external area 60, the diameter of which increases towards the cutting elements 14.
    [0067] Figure 4B shows the cutting segment 11 and the drill rod segment 12, which are connected by the connection and socket-rotation 24, the pin element 25 being arranged in the safety region 48 of the transverse slot 43. connected, the drill rod segment 12 abuts with the front area 33 on the stop ledge 59 of the cutting segment 11. Between the inner side area 57 of the outer locking element 15 and the outer side area 31 of the inner locking element 17 there is a radial slot 61. The radial difference δradial between the outer diameter di,1 of the outer socket element 15 and the outside diameter d2,a of the inner socket element 17 for all diameters is greater than 0.11 mm. The length l2 of the inner locking element 17 is greater than the length l1 of the outer locking element 15, so that between the front area 58 of the outer locking element 15 and the stop shoulder 34 of the inner locking element 17 is An axial slit 62 of slit width δradial is formed. By the radial slot 61 and the axial slot 62 it is ensured that the front area 33 of the inner locking element 17 abuts the stop shoulder 59 of the outer locking element 15 and, when drilling, a defined transmission of force from the shank segment occurs. drill for the cutting segment.
    [0068] Figure 5 shows another embodiment of a drill bit 70 with a cutting segment 71 and a drill rod segment 72. The cutting bit 70 is distinguished from the biting bit 10 in that towards axially, an additional positive union connection is provided, which makes it difficult to inadvertently release the cutting segment 71 from the drill rod segment 72.
    [0069] The cutting segment 71 has, in addition to the outer locking element 15 and the slot-shaped notches 26, a first connection device 73, and the drilling rod segment 72 has, in addition to the inner locking element 17 and from the pin elements 25 a second connecting device 74. The first connecting device 73 comprises a groove 75, which is arranged on the inner side 57 of the outer socket element 15. The second connecting device 74 comprises a projection 76, which is arranged on the outer side 28 of the inner locking element 17 and extends radially outwards. In the connected state of the drill bit 70, the boss 76 and the groove 75 form in the axial direction, i.e. in the drill direction 23, a positive union connection between the cutting segment 71 and the drill rod segment 72. The cutting segment 71 is secured by means of the projection 76 and the groove 75 against an extraction of the drill rod segment 72 from the cutting segment 71.
    [0070] The projection 76 is arranged in the axial direction between the pin elements 25 and the drill rod 16. To remove the drill rod segment 72 from the cutting segment 71, on the front area of the outer socket element 15 is exerted force with the aid of a tool. By the action of force, the elastic segment of the outer locking element 15 is deflected and the positive joint connection between boss 76 and groove 75 can be loosened. The greater the distance of the projection 76 from the front area 33 of the inner locking element 17, the greater the deflection of the elastic segment. The groove 75 is annular and arranged in a plane perpendicular to the axis of rotation 22. An annular groove, which is arranged in axial direction at the height of the slot-shaped notches 26, assists the elastic effect of the segments of the locking element 15 outside between the slotted notches 26.
    [0071] The holding force, which can hold boss 76 and groove 75, can be adapted by the geometry of boss 76 and groove 75. Fitting boss 76 into groove 75 should be as comfortable as possible to the operator; a sloped area facilitates fitting. Suitable geometry parameters for adjusting the holding force are, for example, the radial height of the projection 76, i.e. the height in the radial direction, the contact area between the projection 76 and the interior locking element 17 and the angle of slope.
    权利要求:
    Claims (21)
    [0001]
    1. Drill bit (10; 70) rotatable in a direction of rotation (21) about an axis of rotation (22), having a cutting segment (11; 71) with an annular segment (13), which it is connected at a first end with one or more cutting elements (14) and at a second end it has a first locking element (15) connected to the annular segment (13), the first locking element (15) being carried out as a locking element (15) with an annular stop shoulder (59) located at a transition from the annular segment (13) to the first locking element (15), and - a drill rod segment (12; 72) with a cylindrical drill rod (16), which has, at one end facing the cutting segment (11), a second plug-in element (17), the second plug-in element (17) being made as a plug-in element (17) with a front area (33), the first and second locking elements (15, 17) forming, in a direction the plug-in parallel to the axis of rotation (22), a plug-in connection and are additionally connectable via at least one pin element (25), which is movable in at least one slot (26) in the form of a slot, whereby the at least one pin element (25) is fixed on an external side (27) of the second locking element (17) and the first locking element (15) has the at least one slot (26) in the form of a slot, characterized in that the at least one slot (26) in the form of a slot has a connection slot (44) and a transverse slot (43) with a drag region (47) and a safety region (48), being than the drag region (47), on one side of the connection slot (44) facing the direction of rotation (21), and the safety region (48), on one side of the connection slot (44) opposite the direction of rotation (21), is connected with the connection slot (44).
    [0002]
    2. Drill bit according to claim 1, characterized in that the height (h) of the connection slot (44) parallel to the axis of rotation (22) is at least 10 mm.
    [0003]
    3. Drill bit according to claim 2, characterized in that the height (h) of the connection slot (44) parallel to the axis of rotation (22) is at most 13 mm.
    [0004]
    4. Drill bit according to claim 1, characterized in that the transverse slot (43) parallel to the axis of rotation (22) has a lower distance (A1,u) from the annular segment (13) of at least 3 mm
    [0005]
    5. Drill bit according to claim 4, characterized in that the lower distance (A1,u) from the transverse slot (43) to the annular segment (13) is at most 5 mm.
    [0006]
    6. Drill bit according to claim 1, characterized in that the pin elements (25) have, perpendicularly to the axis of rotation (22), a pin height (Hz), and the pin height ( Hz) is between 68% and 89% of the rod width (b) of the drill rod (16).
    [0007]
    7. Drill bit according to claim 6, characterized in that the pin elements (25) are executed in a circular cylindrical shape with a pin radius (Rz), the pin radius being between 2.5 mm and 5 mm.
    [0008]
    8. Drill bit according to claim 6 or 7, characterized in that the width (B1) of the drag region (47) is at most the pin radius (Rz) plus 1.5 mm.
    [0009]
    9. Drill bit according to claim 8, characterized in that the width (b1) of the drag region (47) is at most the pin radius (Rz) plus 3 mm.
    [0010]
    10. Drill bit according to any one of claims 7 to 9, characterized in that the width (B1) of the drag region (47) is greater than the width (B2) of the safety region (48).
    [0011]
    11. Drill bit according to any one of claims 7 to 9, characterized in that the width (B1) of the drag region (47) and the width (B2) of the safety region (48) coincide.
    [0012]
    12. Drill bit according to any one of the preceding claims, characterized in that the length (l2) of the inner plug element (17) is greater than the length (l1) of the outer plug element (15).
    [0013]
    13. Drill bit according to any one of the preceding claims, characterized in that the length (l1) of the outer fitting element (15) is at least 18 mm.
    [0014]
    14. Drill bit according to any one of the preceding claims, characterized in that the length (l1) of the outer fitting element (15) is at most 28 mm.
    [0015]
    15. Drill bit according to claim 1, characterized in that the outer and inner fitting elements (15, 17) are annular, and the difference (δradial) between an inner diameter (d1,i) of the outer locking element (15) and an outer diameter (d2,a) of the inner locking element (17) is greater than 0.11 mm.
    [0016]
    16. Drill bit according to claim 15, characterized in that on the outer side (27) of the inner plug element (17) three or more pin elements (25) and the plug element (15) are fixed. exterior has three or more slots (26) in the form of a slit, the number of notches (26) being greater than or equal to the number of pin elements (25).
    [0017]
    17. Drill bit according to claim 1, characterized in that the annular segment (13) has a guide segment (54), and the guide segment (54) connects parallel to the longitudinal axis (22) flush with an outer edge (41), an inner edge (42) or an outer and inner edge (41, 42) of the cutting elements (14).
    [0018]
    18. Drill bit according to claim 17, characterized in that the length (m) of the guide segment (54) parallel to the axis of rotation (22) is less than 4 mm.
    [0019]
    19. Drill bit according to claim 1, characterized in that a projection (76) is arranged on the outer side (24) of the inner plug element (17), and the outer plug element (15) has a groove (75), wherein the projection (76) and the groove (75) form, in the connected state in the axial direction, a positive union connection.
    [0020]
    20. Drill bit according to claim 19, characterized in that the projection (76) is arranged in the axial direction between the pin elements (25) and the drill rod (16), and the groove (75) it is arranged in the axial direction at the height of the slots (26) in the form of a slit.
    [0021]
    21. Drill bit according to claim 20, characterized in that the groove (75) is made annular and is arranged in a plane perpendicular to the axis of rotation (22).
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    同族专利:
    公开号 | 公开日
    EP2745965A1|2014-06-25|
    US20150328694A1|2015-11-19|
    JP2016502937A|2016-02-01|
    EP2934799A1|2015-10-28|
    JP6175513B2|2017-08-02|
    WO2014096360A1|2014-06-26|
    KR101726529B1|2017-04-12|
    CN104955598B|2018-12-21|
    US10201858B2|2019-02-12|
    CN104955598A|2015-09-30|
    WO2014096360A8|2015-06-25|
    RU2631566C2|2017-09-25|
    KR20150095913A|2015-08-21|
    BR112015013811A2|2017-07-11|
    RU2015129594A|2017-01-25|
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    法律状态:
    2018-11-21| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-04-07| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-11-09| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2022-01-18| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 20/12/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EPPCT/EP2012/076774|2012-12-21|
    PCT/EP2012/076774|WO2013093060A1|2011-12-22|2012-12-21|Drill bit with an exchangeable cutting portion|
    EP13166990.5|2013-05-08|
    EP13166990.5A|EP2745965A1|2012-12-21|2013-05-08|Annular drill bit with a replaceable cutting section|
    PCT/EP2013/077690|WO2014096360A1|2012-12-21|2013-12-20|Drill bit with an exchangeable cutting portion|
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