Drilling tool with a drill head

Abstract

In a drilling tool, in particular a rock drilling tool, with a drill head (130) having a rotational axis and at least two diametrically opposed main cutting elements (220, 240) each with a main cutting edge (221, 241) and at least two diametrically opposed secondary cutting elements (230) each with a secondary cutting edge (231), wherein a secondary cutting element (230) is arranged between each pair of main cutting elements (220, 240) adjacent in the circumferential direction of the drill head (130), the main cutting edges (221, 241) of the at least two diametrically opposed main cutting elements (220, 240) each have a first maximum height (711, 712) starting from a base side (131) of the drill head (130), and the secondary cutting edges (231) of the at least two diametrically opposed secondary cutting elements (230) have a first maximum height (711, 712) starting from the base side (131) of the drill head (130) each has a second maximum height (713), wherein the first maximum height (711,712) and the second maximum height (713) are identical, at least within specified manufacturing tolerances.

Description

State of the art

[0001] The present invention relates to a drilling tool, in particular a rock drilling tool, having a drill head having a rotational axis and at least two diametrically opposed main cutting elements, each having a main cutting edge, and at least two diametrically opposed secondary cutting elements, each having a secondary cutting edge, wherein a secondary cutting element is arranged between each of two main cutting elements adjacent in the circumferential direction of the drill head.

[0002] Such a drilling tool, designed as a rock drilling tool, is known from the prior art. The drilling tool has a drill head with at least two diametrically opposed main cutting elements, each with a main cutting edge, and at least two diametrically opposed secondary cutting elements, each with a secondary cutting edge. A secondary cutting element is arranged between each of two adjacent main cutting elements in the circumferential direction of the drill head. The main cutting edges and the secondary cutting edges have different heights, with a height of the secondary cutting edges being smaller than a height of the main cutting edges. Furthermore, the drill head has a central pyramid. Disclosure of the invention

[0003] The invention relates to a drilling tool, in particular a rock drilling tool, having a drill head having a rotational axis and at least two diametrically opposed main cutting elements, each with a main cutting edge, and at least two diametrically opposed secondary cutting elements, each with a secondary cutting edge, wherein a secondary cutting element is arranged between two main cutting elements adjacent in the circumferential direction of the drill head. The main cutting edges of the at least two diametrically opposed main cutting elements each have a first maximum height starting from a base side of the drill head, and the secondary cutting edges of the at least two diametrically opposed secondary cutting elements each have a second maximum height starting from the base side of the drill head, wherein the first maximum height and the second maximum height are identical at least within predetermined manufacturing tolerances.

[0004] The invention thus enables the provision of a drilling tool in which the maximum heights of the main cutting element and the secondary cutting element are identical, at least within specified manufacturing tolerances, and thus effectively prevent catching during a drilling operation, particularly during a drilling operation in a reinforcement element. Furthermore, the triggering of a slip clutch of a handheld power tool used for the drilling operation is at least mitigated.

[0005] At least one secondary cutting edge of the at least two diametrically opposed secondary cutting elements and / or at least one main cutting edge of the at least two diametrically opposed main cutting elements preferably has the second maximum height on an outer circumference of the drill head and a reduced height between the rotation axis and the outer circumference.

[0006] This allows for an increase in drilling speed, allowing the at least one secondary cutting edge and / or primary cutting edge in the radially outer region to penetrate faster and deeper into the material to be machined. Furthermore, a higher drilling speed can lead to a longer overall drilling path of the drilling tool.

[0007] Preferably, the main cutting edges of the at least two diametrically opposite main cutting elements and / or the secondary cutting edges of the at least two diametrically opposite secondary cutting elements each have a chamfer and / or a radius at their free end.

[0008] This makes it easy to prevent an edge from remaining at the hole during a drilling process, especially a reinforcement drilling process.

[0009] Preferably, a central pyramid with at least four cutting edges is provided, wherein between each main cutting element of the at least two diametrically opposed main cutting elements and each adjacent secondary cutting element of the at least two diametrically opposed secondary cutting elements in the circumferential direction of the drill head, one cutting edge of the at least four cutting edges of the central pyramid is arranged.

[0010] Thus, the offset arrangement of the cutting edges of the central pyramid relative to the main cutting edges and the secondary cutting edges enables a safe and reliable increase in the efficiency of a respective drilling speed, since the material to be machined is machined at several points simultaneously.

[0011] According to one embodiment, the at least four cutting edges of the central pyramid are each arranged at an associated angle of 90° to one another in the circumferential direction of the drill head.

[0012] This makes it easy and uncomplicated to arrange the cutting edges of the central pyramid symmetrically.

[0013] Preferably, each cutting edge of the at least four cutting edges of the central pyramid is arranged at a predetermined angle to a main cutting edge of the at least two diametrically opposite main cutting elements adjacent to it in the circumferential direction of the drill head, wherein the predetermined angle is 30°, 45° or 60°.

[0014] This makes it easy to match the drilling tool to an impact pattern assigned to a corresponding hand-held power tool.

[0015] Preferably, the main cutting edges of the at least two diametrically opposed main cutting elements, the secondary cutting edges of the at least two diametrically opposed secondary cutting elements and / or the at least four cutting edges of the central pyramid are aligned in the radial direction of the drill head.

[0016] Thus, a suitable arrangement of the cutting edges of the central pyramid relative to the main cutting edges and secondary cutting edges can be formed for efficient drilling operation.

[0017] Preferably, the main cutting edges of the at least two diametrically opposed main cutting elements, the secondary cutting edges of the at least two diametrically opposed secondary cutting elements and / or the at least four cutting edges of the central pyramid are at least partially straight, curved, convexly curved and / or concavely curved.

[0018] This makes it possible to easily achieve a suitable design of the cutting edges of the central pyramid, the main cutting edges and / or the secondary cutting edges.

[0019] Preferably, the drilling tool is provided with a drill shank having a fastening section for releasably fastening in a tool holder of a hand-held power tool and a spiral conveyor section for removing drilling dust generated during a machining operation, wherein the drill shank is connected to the drill head via a material-to-material connection.

[0020] This allows a stable and robust connection between the drill head and the drill shaft to be formed.

[0021] Preferably, the fastening section is designed as an SDS shaft.

[0022] This makes it possible to provide a common and widely used fastening section. Short description of the drawings

[0023] The invention is explained in more detail in the following description using exemplary embodiments illustrated in the drawings. They show: Fig. 1 a plan view of a drilling tool with a drill head according to the invention, Fig. 2 a top view of the drill head of Fig. 1 with a central pyramid, Fig. 3 a perspective view of the drill head of Fig. 1 and Fig. 2, Fig. 4 a plan view of the drill head of Fig. 1 to Fig. 3 with a first alignment of the central pyramid, Fig. 5 a top view of the drill head of Fig. 1 to Fig. 4 with a further alignment of the central pyramid, Fig. 6 a top view of the drill head of Fig. 1 to Fig. 5 with an alternative orientation of the central pyramid, Fig. 7 a side view of the drill head of Fig. 1 to Fig. 6, Fig. 8 a side view of the drill head of Fig. 1 to Fig. 7, whereby the drill head compared to Fig. 7 is arranged twisted in the circumferential direction, and Fig. 9 a perspective view of the drill head of Fig. 1 to Fig. 8 during a drilling operation in a reinforcement element. Description of the embodiments

[0024] In the figures, elements with the same or comparable function are provided with identical reference symbols and are described in detail only once.

[0025] Fig. 1 shows a substantially cylindrical drilling tool 100. Generally, the drilling tool 100 is designed to be received in a mounting device of a machine tool, preferably a handheld power tool for drilling and / or impact machining. The drilling tool 100 can be designed, for example, as a rock drilling tool for machining mineral materials, such as rock, concrete, and / or reinforced concrete. The drilling tool 100 according to the invention can also be intended for machining other materials deemed appropriate by a person skilled in the art, such as wood, plastic, or a composite material.

[0026] Preferably, the drilling tool 100 is designed to perform a rotary and / or translatory working movement on a workpiece to be machined.

[0027] The drilling tool 100 illustratively extends in the axial direction along a tool axis 199. The tool axis 199 forms a rotation axis of the drilling tool 100 and is referred to below as the “rotation axis 199”. The drilling tool 100 preferably has at least one drill head 130 and a drill shank 115 connected to the drill head 130, which are preferably formed as one piece or at least are connected to one another by a material fit. The drill shank 115 preferably has a fastening section 120 for releasably fastening the drilling tool 100 in a tool holder of a hand-held power tool and a spiral-shaped conveying section 110 for removing drilling dust generated during a machining operation. Alternatively, the drill shank 115 can be designed as a suction drill shank or the drilling tool 100 as a suction drilling tool, e.g., with a suction opening in the drill shank 115.

[0028] The conveying section 110 preferably has four conveying grooves 117 that spiral around the rotational axis 199 and are designed to transport the drilling dust generated during a machining operation along the axial direction of the rotational axis 199 in a direction away from the drill head 130, e.g., from a corresponding borehole. Alternatively or additionally, fewer than four, such as a single, two, or three conveying grooves 117, or more than four, such as five, six, or more, conveying grooves 117 may be formed.

[0029] The spiral conveying grooves 117 are illustratively separated by webs 118 that spirally wind in the circumferential direction 198 around the rotation axis 199. The webs 118 preferably run parallel to the conveying grooves 117 and are correspondingly spiral-shaped.

[0030] The fastening section 120 is illustratively arranged on a side of the conveying section 110 facing away from the drill head 130. The fastening section 120 preferably has a plurality of radial recesses designed to enable a positive and / or non-positive connection of the drilling tool 100, in particular the fastening section 120 of the drilling tool 100, to a handheld power tool.

[0031] According to one embodiment, the fastening section 120 of the drill shank 115 is designed as an SDS shank. The fastening section 120 can be designed identically to conventional and already available fastening sections, such as SDS, SDS-max, or SDS-plus fastening sections. Such SDS fastening sections are well known to a person skilled in the art, so a detailed description thereof is omitted.

[0032] Preferably, a base side 131 of the drill head 130 faces an axial end 111 of the drill shaft 115, in particular of the conveying section 110. According to one embodiment, the drill shaft 115 is connected to the drill head 130 via a material-to-material connection, preferably formed integrally therewith. The drill shaft 115 is materially connected to the drill head 130, in particular with or without the aid of a filler material. An auxiliary material can be used to connect the drill head 130 to the drill shaft 115, for example by means of a weld and / or a soldered connection. The auxiliary material can be, for example, nickel, copper, cobalt, manganese, and / or tin. According to one embodiment, the drill head 130 comprises hard metal in order to withstand extremely high wear loads.The drill head 130 is designed in particular as a solid carbide head and limits the axial extension of the drill shaft 115 in the axial direction of the rotation axis 199. The drill shaft 115 can comprise steel.

[0033] Furthermore, the drill head 130 preferably comprises a plurality of cutting elements designed for removing, cutting, scraping and / or crushing a workpiece to be machined. Depending on the embodiment of the drill head 130, the cutting elements can be divided into main cutting elements (220, 240 in Fig. 2) and / or secondary cutting elements (210, 230 in Fig. 2) be divided.

[0034] Fig. 2 shows the drill head 130 of the drilling tool 100 of Fig. 1. The drill head 130 preferably has at least three, and illustratively four, cutting elements 210, 220, 230, 240 with associated cutting edges 211, 221, 231, 241. A central pyramid 250 with at least three, and illustratively four, cutting edges 251, 252, 253, 254 can optionally be associated with the drill head 130. Preferably, a cutting edge 251, 252, 253, 254 of the central pyramid 250 is arranged between each of the two circumferentially adjacent cutting edges 211, 221, 231, 241.

[0035] It should be noted that the drill head 130 can also have more than four cutting elements 210, 220, 230, 240 and / or the central pyramid 250 can also have more than four cutting edges 251, 252, 253, 254. The number of cutting elements 210, 220, 230, 240 can differ from the number of cutting edges 251, 252, 253, 254 of the pyramid 250. Alternatively, the cutting elements 210, 220, 230, 240 and / or the central pyramid 250 can have a different number of cutting edges 211, 221, 231, 241 and 251, 252, 253, 254, respectively. For example, a cutting element 210, 220, 230, 240 can also have two cutting edges.

[0036] According to one embodiment, two diametrically opposed cutting elements 220, 240 are designed as main cutting elements and are referred to below as "main cutting elements 220, 240," and the associated cutting edges 221, 241 are referred to below as "main cutting edges 221, 241." Furthermore, two diametrically opposed cutting elements 210, 230 are designed as secondary cutting elements and are referred to below as "secondary cutting elements 210, 230," and the associated cutting edges 211, 231 are referred to below as "secondary cutting edges 211, 231." Preferably, a secondary cutting element 210, 230 is arranged between each two adjacent main cutting elements 220, 240 in the circumferential direction 198 of the drill head 130.Preferably, a cutting edge 251, 252, 253, 254 of the central pyramid 250 is arranged between a main cutting element 220, 240 and a secondary cutting element 210, 230 adjacent to the main cutting element 220, 240 in the circumferential direction 198 of the drill head 130. Illustratively, the cutting edge 251 is arranged in the circumferential direction 198 between the main cutting edge 241 and the secondary cutting edge 211, the cutting edge 252 is arranged in the circumferential direction 198 between the secondary cutting edge 211 and the main cutting edge 221, the cutting edge 253 is arranged in the circumferential direction 198 between the main cutting edge 221 and the secondary cutting edge 231 and the cutting edge 254 is arranged in the circumferential direction 198 between the secondary cutting edge 231 and the main cutting edge 241.

[0037] Preferably, the cutting edges 211, 221, 231, 241 and / or the cutting edges 251, 252, 253, 254 of the central pyramid 250 are aligned in the radial direction 299 of the drill head 130. In particular, the main cutting edges 221, 241 of the at least two diametrically opposed main cutting elements 220, 240, the secondary cutting edges 211, 231 of the at least two diametrically opposed secondary cutting elements 210, 230 and / or the at least four cutting edges 251, 252, 253, 254 of the central pyramid 250 are aligned in the radial direction 299 of the drill head 130.

[0038] According to one embodiment, at least one cutting edge 251, 252, 253, 254 of the central pyramid 250 can be concavely and / or convexly curved. Furthermore, at least one pyramid surface of the central pyramid 250 can be concavely and / or convexly curved.

[0039] Preferably, the main cutting edges 221, 241 of the at least two diametrically opposed main cutting elements 220, 240, the secondary cutting edges 211, 231 of the at least two diametrically opposed secondary cutting elements 210, 230, and / or the at least four cutting edges 251, 252, 253, 254 of the central pyramid 250 are at least partially straight, curved, convexly curved, and / or concavely curved. For example, a cutting edge 211, 221, 231, 241 or 251, 252, 253, 254 can have a straight section that transitions into a convexly curved section.

[0040] Fig. 3 shows the drill head 130 of Fig. 1 and Fig. 2 with the main cutting elements 220, 240 and the secondary cutting elements 210, 230, as well as the central pyramid 250 of Fig. 2. According to one embodiment, at least one of the main cutting edges 221, 241 of the at least two diametrically opposed main cutting elements 220, 240 and / or at least one of the secondary cutting edges 211, 231 of the at least two diametrically opposed secondary cutting elements 210, 230 has a chamfer 321, 331 and / or a radius or a rounding at its respective free end 322, 332. Preferably, all main cutting edges 221, 241 and / or all secondary cutting edges 211, 231 each have a chamfer 321, 331 and / or a radius. Alternatively, at least one cutting edge 251, 252, 253, 254 of the central pyramid 250 can have a chamfer and / or a radius.

[0041] Fig. 4 shows the drill head 130 of Fig. 1 to Fig. 3 with the main cutting elements 220, 240 and the secondary cutting elements 210, 230, as well as the central pyramid 250 of Fig. 2 and Fig. 3. Preferably, the cutting edges 251, 252, 253, 254 of the central pyramid 250 are arranged in the circumferential direction 198 of the drill head 130 at associated angles 411, 412, 413, 414 to one another. According to one embodiment, the associated angles 411, 412, 413, 414 are equal. Preferably, the associated angles 411, 412, 413, 414 are 90°. Alternatively, the associated angles 411, 412, 413, 414 can also be different. Furthermore, two opposite angles 411, 413, 412, 414 can also be equal, for example, two angles being 80° and two angles being 100°.

[0042] According to one embodiment, the illustrative four cutting edges 251, 252, 253, 254 of the central pyramid 250 are at a predetermined angle 401 (501 in Fig. 5; Fig. 601 in Fig. 6) to a main cutting edge 221, 241 of the main cutting elements 220, 240, which is adjacent in the circumferential direction 198 of the drill head 130. The predetermined angle 401 between the cutting edge 252 and the main cutting edge 221 is shown as an example and is preferably 30°. Alternatively, the predetermined angle 401 can also be arranged between a cutting edge 251, 252, 253, 254 of the central pyramid 250 and a secondary cutting edge 211, 231 of the secondary cutting elements 210, 230, which is adjacent in the circumferential direction 198 of the drill head 130.

[0043] Fig. 5 shows the drill head 130 of Fig. 1 to Fig. 4, in which the central pyramid 250 is arranged at a predetermined angle 501 to the main cutting elements 220, 240 and / or the secondary cutting elements 210, 230. The predetermined angle 501 between the cutting edge 252 of the central pyramid 250 and the main cutting edge 221 of the main cutting element 220 is shown as an example. Preferably, the angle 501 is smaller than Fig. 4 larger and preferably 45°.

[0044] Fig. 6 shows the drill head 130 of Fig. 1 to Fig. 5, in which a predetermined angle 601 is shown as an example between the cutting edge 252 and the main cutting edge 221. Preferably, the angle 601 is 60°. It is pointed out that the angles 401 in Fig. 4, Fig. 501 in Fig. 5, Fig. 601 in Fig. 6 can also have any other angle values.

[0045] Fig. 7 shows the drill head 130 of Fig. 1 to Fig. 6 with the base side 131 and the main cutting elements 220, 240 as well as the secondary cutting element 230 to illustrate exemplary heights of the main cutting elements and the secondary cutting elements of the drill head 130. Illustratively, the main cutting elements 220, 240 have associated heights 712, 711 and the secondary cutting element 230 has an associated height 713. Here, the heights 711, 712, 713 are each formed between the base side 131 of the drill head 130 and the associated cutting edges 221, 241, 231 of the main cutting elements 220, 240 and the secondary cutting element 230, respectively. Illustratively, a height 711 is formed between the base side 131 and the main cutting edge 241, a height 712 is formed between the base side 131 and the main cutting edge 221, and a height 713 is formed between the base side 131 and the secondary cutting edge 231.

[0046] According to one embodiment, at least one main cutting element and / or at least one secondary cutting element has a consistent or constant height. Illustratively, the heights 712, 711 of the main cutting elements 220, 240 are consistent or constant. Furthermore, the heights can be identical within predetermined manufacturing tolerances. For example, the heights 711, 712 are identical at least within predetermined manufacturing tolerances, as indicated by a contour line 710. The line 710 is illustratively arranged parallel to the base side 131. Furthermore, the heights 711, 712, 713 preferably form a maximum height. Furthermore, the main cutting elements 220, 240 and / or the secondary cutting elements 230 (and 210 in Fig. 1 to Fig. 6) have a comparatively large cutting edge length 721 aligned in the radial direction 299.

[0047] Fig. 8 shows the drill head 130 of Fig. 1 to Fig. 7, which in the circumferential direction 198 of Fig. 2 to Fig. 6 relative to Fig. 7 is arranged rotated by 90°, so that the two secondary cutting elements 210, 230 are arranged illustratively on the right and left and the main cutting element 220 is arranged illustratively in the middle. The secondary cutting element 230 has a height of 713 of Fig. 7 and the main cutting element 220 has the height 712 of Fig. 7. The secondary cutting element 210 illustratively has a height 831. The heights 713, 831 are preferably formed on an outer circumference 802 of the drill head 130 on the secondary cutting elements 210, 230.

[0048] According to one embodiment, at least one secondary cutting edge 211, 231 and / or at least one main cutting edge 221 (and 241 in Fig. 7) on the outer circumference 802 of the drill head 130 has a respective maximum height, wherein the maximum heights correspond to the heights 831, 713, 712 (and 711 in Fig. 7). These maximum heights are reduced illustratively in each case in an area facing the central pyramid 250 via a recess 820 to a reduced height 833. This preferably results in a cutting edge length 811 aligned in the radial direction 299. The cutting edge length 811 is shorter than the cutting edge length 721 of Fig. 7.

[0049] Illustratively, the maximum heights 713, 831 assigned to the secondary cutting edges 211, 231 are reduced. However, it should be noted that the maximum heights 712 (and 711 in Fig. 7) the main cutting edges 221 (and 241 in Fig. 7) via a recess 820. Alternatively, at least one secondary cutting edge 211, 231 and / or at least one main cutting edge 221 (and 241 in Fig. 7) over their entire cutting edge length 811 (and / or 721 in Fig. 7) is curved. In this case, at least one secondary cutting edge 211, 231 and / or at least one main cutting edge 221 (and 241 in Fig. 7) be concave and / or convex. Furthermore, the drilling tool 100 with the drilling head 130 can be Fig. 7 and Fig. 8 with the heights 711, 712, 713, 831 can also be formed without a central pyramid 250.

[0050] Fig. 9 shows the drill head 130 of Fig. 1 to Fig. 8 during an exemplary drilling process in a reinforcement element 910. Illustratively, the central pyramid 250 has already drilled a recess 920 in the reinforcement element 910. Due to the twisted arrangement of the central pyramid 250 or the cutting edges 251, 252, 253, 254 assigned to the central pyramid 250, of which Fig. 9 only the cutting edge 253 is visible, relative to the main cutting elements 220, 240 or secondary cutting elements 210, 230, these can move during the drilling process on the reinforcement element 910 or on the resulting bore via the cutting edges, here in Fig. 9 support the main cutting edges 221, 241. This can prevent the drilling tool 100 from sagging Fig. 1 and / or hooking into the reinforcing element 910 can be prevented.

Claims

[1] Drilling tool (100), in particular a rock drilling tool, with a drill head (130) having a rotational axis (199) and at least two diametrically opposed main cutting elements (220, 240) each having a main cutting edge (221, 241) and at least two diametrically opposed secondary cutting elements (210, 230) each having a secondary cutting edge (211, 231), wherein a secondary cutting element (210, 230) is arranged between each of two main cutting elements (220, 240) adjacent in the circumferential direction (198) of the drill head (130), characterized byin that the main cutting edges (221, 241) of the at least two diametrically opposed main cutting elements (220, 240) each have a first maximum height (711, 712) starting from a base side (131) of the drill head (130), and the secondary cutting edges (211, 231) of the at least two diametrically opposed secondary cutting elements (210, 230) each have a second maximum height (713; 831) starting from the base side (131) of the drill head (130), wherein the first maximum height (711, 712) and the second maximum height (713; 831) are identical at least within predetermined manufacturing tolerances. [2] Drilling tool according to claim 1, characterized bythat at least one secondary cutting edge (211, 231) of the at least two diametrically opposed secondary cutting elements (210, 230) and / or at least one main cutting edge (221, 241) of the at least two diametrically opposed main cutting elements (220, 240) each has the second maximum height (713; 831) on an outer circumference (802) of the drill head (130) and has a reduced height (833) between the rotation axis (199) and the outer circumference (802). [3] Drilling tool according to claim 1 or 2, characterized by that the main cutting edges (221, 241) of the at least two diametrically opposite main cutting elements (220, 240) and / or the secondary cutting edges (211, 231) of the at least two diametrically opposite secondary cutting elements (210, 230) each have a chamfer (321, 331) and / or a radius at their free end. [4] Drilling tool according to one of the preceding claims, characterized bythat a central pyramid (250) with at least four cutting edges (251, 252, 253, 254) is provided, wherein between each main cutting element (220, 240) of the at least two diametrically opposed main cutting elements (220, 240) and each adjacent secondary cutting element (210, 230) of the at least two diametrically opposed secondary cutting elements (210, 230) in the circumferential direction (198) of the drill head (130), a cutting edge (251, 252, 253, 254) of the at least four cutting edges (251, 252, 253, 254) of the central pyramid (250) is arranged. [5] Drilling tool according to one of the preceding claims, characterized by that the at least four cutting edges (251, 252, 253, 254) of the central pyramid (250) are each arranged at an associated angle (411, 412, 413, 414) of 90° to one another in the circumferential direction (198) of the drill head (130). [6] Drilling tool according to one of the preceding claims, characterized bythat each cutting edge (252) of the at least four cutting edges (251, 252, 253, 254) of the central pyramid (250) is arranged at a predetermined angle (401, 501, 601) to a main cutting edge (221) of the at least two diametrically opposite main cutting elements (220, 240) which is adjacent in the circumferential direction (198) of the drill head (130), wherein the predetermined angle (401, 501, 601) is 30°, 45° or 60°. [7] Drilling tool according to one of the preceding claims, characterized by that the main cutting edges (221, 241) of the at least two diametrically opposed main cutting elements (220, 240), the secondary cutting edges (211, 231) of the at least two diametrically opposed secondary cutting elements (210, 230) and / or the at least four cutting edges (251, 252, 253, 254) of the central pyramid (250) are aligned in the radial direction (299) of the drill head (130). [8] Drilling tool according to one of the preceding claims, characterized bythat the main cutting edges (221, 241) of the at least two diametrically opposed main cutting elements (220, 240), the secondary cutting edges (211, 231) of the at least two diametrically opposed secondary cutting elements (210, 230) and / or the at least four cutting edges (251, 252, 253, 254) of the central pyramid (250) are at least partially straight, curved, convexly curved and / or concavely curved. [9] Drilling tool according to one of the preceding claims, with a drill shank (115) which has a fastening section (120) for releasably fastening in a tool holder of a hand-held power tool and a spiral conveyor section (110) for removing drilling dust arising during a machining operation, wherein the drill shank (115) is connected to the drill head (130) via a material-to-material connection. [10] Drilling tool according to claim 9, characterized bythat the fastening section (120) is designed as an SDS shaft.

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