Wood drilling device, wood drilling system and method for producing a wood drilling device

Abstract

Wood drilling device (10a, 12a; 10b, 12b) with at least one drill shaft (30a, 32a; 30b, 32b), with at least one drill tip (26a, 28a; 26b, 28b), and with at least one cutting body (18a, 24a; 18b, 24b), wherein the cutting body (18a, 24a; 18b, 24b) has at least one cutting wing (66a, 68a; 66b, 68b), wherein at least one of the cutting wings (66a, 68a; 66b, 68b) has a cutting surface (116a, 118a; 116b, 118b) which is arranged on a base side (70a, 70b) facing the drill tip (26a, 28a; 26b, 28b). is.It is proposed that the cutting surface (116a, 118a; 116b, 118b) is formed by at least two adjacent cutting surfaces (122a, 124a, 126a, 128a; 122b, 124b, 126b, 128b) which are angled to each other at an angle (130a; 130b) and which each have an angle other than 0° to the axis of rotation (16a, 22a; 16b, 22b).

Description

State of the art

[0001] Various wood drilling tools are already known from the state of the art. Disclosure of the invention

[0002] The invention relates to a wood drilling device for drilling, in particular impact drilling, of a wood material, in particular containing metal fragments, with at least one drill shank which is provided for clamping on a machine tool, with at least one drill tip which preferably has a thread, and with at least one cutting body for cutting the wood material, wherein the cutting body has at least one, preferably at least two, in particular arranged symmetrically to each other with respect to an axis of rotation of the cutting body, wherein at least one of the cutting wings has a cutting surface which is arranged on a base side facing the drill tip, which is defined in particular with respect to an imaginary cylinder about the axis of rotation.

[0003] It is proposed that the cutting surface is formed by at least two adjacent cutting surfaces angled from a drilling plane perpendicular to the axis of rotation in the direction of the drill shaft, which are angled to each other and each have an angle to the axis of rotation other than 0°.

[0004] Preferably, the wood drilling device comprises a drill tip, a cutting body, and a drill shank, which together form a drilling unit. Preferably, the drilling unit is made of a single material composition, particularly at least partially metallic, and preferably at least predominantly metallic, especially spring steel. Preferably, the drilling unit is formed in one piece. In particular, the drill tip and the cutting body are formed in one piece. In particular, the cutting body and the drill shank are formed in one piece.The term "one-piece" is to be understood in particular as being at least materially bonded, for example by a welding process, an adhesive bonding process, an injection molding process, and / or another process that would appear appropriate to a person skilled in the art, and / or advantageously formed in one piece, such as by being manufactured from a single casting and / or by being manufactured by a forging process or a single- or multi-component injection molding process, and advantageously from a single blank. Preferably, the drill tip is connected to the cutting body at an end opposite the drill shank. Preferably, the drill shank is connected to the cutting body at an end opposite the drill tip. Preferably, the drilling unit is formed materially around the axis of rotation. Preferably, the drilling unit is free of cavities within the drilling unit.Particularly preferably, the drilling unit extends materially along the axis of rotation, with a section of the axis of rotation passing through a material part of the drilling unit between an end of the drill tip facing away from the drill shaft and an end of the drill shaft facing away from the drill tip. The drill shaft has at least a partial hardness different from that of the drill tip, particularly as measured by Rockwell.

[0005] Preferably, the drill tip includes a thread. Preferably, the drill tip, with the exception of the thread, is materially symmetrical about the axis of rotation, with deviations of a maximum of 20%, preferably a maximum of 10%, particularly with regard to volume. Preferably, the drill tip forms an end of the drilling unit facing away from the drill shank.

[0006] Preferably, the drill shank comprises a shank body and a tool connecting body. Preferably, the tool connecting body is designed for clamping on the machine tool in sections. "Designed" is understood to mean, in particular, specially designed, programmed, configured, and / or equipped. The fact that an object is designed for a specific function is understood to mean, in particular, that the object fulfills and / or performs this specific function in at least one application and / or operating state. An operating state of the wood drilling device is preferably understood to be a state in which the wood drilling device is clamped on the machine tool and preferably driven by the machine tool to rotate about its axis of rotation.

[0007] Preferably, the shank body has a uniform, and in particular constant, diameter. Preferably, the shank body has a uniformly sized, and in particular constant, cross-section perpendicular to the axis of rotation, particularly independent of a measuring point along the axis of rotation, and especially measured at a surface of the cross-section. Preferably, the shank body has a uniformly shaped cross-section perpendicular to the axis of rotation, and in particular independent of a measuring point along the axis of rotation, and especially viewed at an outer contour of the cross-section. Preferably, the shank body is arranged between the cutting body and the tool connecting body. Preferably, the shank body has a cross-section perpendicular to the axis of rotation with a circular outer contour.

[0008] Preferably, the tool connector comprises a transition area and a coupling area. Preferably, only the coupling area of ​​the tool connector is provided for clamping on the machine tool. The coupling area is preferably designed as a hex area. Alternatively, the coupling area can be designed as a triplet, quart, hept, sep, oct area, or the like, wherein a triplet area, for example, describes an area which, in a cross-section perpendicular to the axis of rotation, is optionally partially formed by at least one rounded outer contour and which is partially formed by three, in particular ground, straight outer contours, and wherein higher-order areas are defined analogously to the triplet area. Alternatively, the coupling area can have a substantially circular outer contour in a cross-section perpendicular to the axis of rotation, which has partially flattened sections.Preferably, the coupling area, in particular the hex area, is designed, and especially shaped, for clamping on the machine tool. Preferably, the tool connecting body in the coupling area has a cross-section perpendicular to the axis of rotation with a hexagonal outer contour. Preferably, the transition area is arranged between the coupling area and the shank body. Preferably, the tool connecting body in the transition area, viewed along the axis of rotation, has different cross-sections perpendicular to the axis of rotation, wherein the cross-sections have an outer contour that forms a continuous transition between a hexagonal outer contour such as the tool connecting body and a circular outer contour such as the shank body. Preferably, the coupling area, in particular the hex area, forms an end of the drilling unit facing away from the drill tip.The coupling area, in particular the hex area, can have a partial coupling area in which the coupling area, in particular the hex area, is tapered, preferably for snap-fit ​​clamping on the machine tool. In particular, the coupling area, in particular the hex area, can have a cross-section perpendicular to the axis of rotation in the partial coupling area, which has a non-uniformly shaped outer contour. In particular, the coupling area, in particular the hex area, can have a cross-section perpendicular to the axis of rotation in the partial coupling area, which has a non-hexagonal outer contour, in particular a circular outer contour. Preferably, the cutting body has a larger diameter, in particular a larger maximum extent perpendicular to the axis of rotation, at a boundary with the shank body than the shank body.

[0009] Preferably, the cutting body has at least two, preferably exactly two, cutting wings arranged symmetrically to each other with respect to an axis of rotation of the cutting body. Preferably, the at least two cutting wings are symmetrically shaped. Preferably, a maximum radius, in particular a diameter, and in particular a maximum extent of the cutting body perpendicular to the axis of rotation of the drilling unit, in particular the wood drilling device, is formed on the cutting wing with respect to the axis of rotation. Preferably, the at least two cutting wings are arranged opposite each other with respect to the axis of rotation. Preferably, a cutting wing is to be understood as a part of the cutting body that projects radially from the axis of rotation, preferably from a central section of the cutting body in which the cutting body is formed completely symmetrically around the axis of rotation.The cutting body can have at least three, four, five, or the like, cutting wings arranged symmetrically to one another with respect to an axis of rotation of the cutting body. Preferably, the cutting body has non-uniform maximum transverse extents, in particular non-uniform maximum diameters, perpendicular to the axis of rotation when viewed along the axis of rotation. Preferably, the cutting body has a larger maximum radius, in particular diameter, and in particular a larger maximum extent perpendicular to the axis of rotation than the drill shank.

[0010] Preferably, the cutting body has a base side, in particular an end face. Preferably, the base side is defined with respect to a smallest imaginary cylinder having a cylinder axis identical to the axis of rotation and just completely enclosing the cutting body. Preferably, the base side is a side of the cutting body facing the drill tip and is oriented, in particular, towards a base side of the smallest imaginary cylinder. Preferably, the base side of the cutting body defines the imaginary drilling plane as a plane that is directly adjacent to the base side outside the cutting body and is oriented perpendicular to the axis of rotation. Preferably, the drilling plane is an imaginary plane oriented perpendicular to the axis of rotation and is located at an end of the cutting body facing the drill tip, between the drill tip and the cutting body.Preferably, the drilling plane is arranged directly adjacent to the cutting body. Preferably, the imaginary drilling plane is arranged directly adjacent to the cutting body.

[0011] Preferably, the at least one, preferably the at least two, cutting wings each have a cutting surface arranged on the base side of the cutting body facing the drill tip. Preferably, the minimum distance of the cutting surfaces to the axis of rotation is at least one maximum thickness, preferably at least 120% of the maximum thickness, of the drill tip, particularly measured perpendicular to the axis of rotation. Preferably, the cutting surfaces can be directly adjacent to the drill tip; however, it is also conceivable that the cutting surfaces are arranged at least partially away from the drill tip, for example, due to manufacturing constraints. Preferably, the at least two cutting surfaces are arranged symmetrically to each other around the axis of rotation.Preferably, the cutting surface, at least partially, and in particular an edge of the cutting surface, is designed to remove, cut, and / or machine the wood material and / or the metal fragments in the wood material, particularly during the operation of the wood drilling device. Preferably, the at least one, and more preferably each, cutting surface is formed by at least two, and in particular exactly two, directly adjacent cutting surfaces, which in particular share a common boundary edge. Preferably, the at least one, and more preferably each, cutting surface is formed by at least two, and in particular exactly two, adjacent cutting surfaces, which are angled from the drilling plane towards the drill shank along an increasing diameter.Preferably, the at least two cutting surfaces of each cutting surface are angled relative to each other at an angle of at least 10°, preferably at least 20°, particularly preferably at least 30°, and most preferably at least 40°. Preferably, the at least two cutting surfaces of each cutting surface are angled relative to each other at an angle of at most 80°, preferably at most 70°, particularly preferably at most 60°, and most preferably at most 50°. Preferably, the at least two cutting surfaces of each cutting surface are arranged adjacent to each other without offset, particularly along the axis of rotation. Preferably, the at least two cutting surfaces of each cutting surface each have an angle to the axis of rotation other than 0°, 90°, or 180°. Preferably, the cutting surfaces each form obtuse angles to the axis of rotation.Preferably, the cutting surfaces of a cutting surface each form obtuse internal and / or external angles with each other. Preferably, a cutting surface of the at least two cutting surfaces of each cutting surface, arranged towards the drill tip, is angled less sharply from the drilling plane towards the drill shank along a radial direction than a cutting surface of the at least two cutting surfaces of each cutting surface, arranged away from the drill tip. Preferably, the cutting surface of the at least two cutting surfaces of each cutting surface, arranged away from the drill tip, is angled more sharply from the drilling plane towards the drill shank along a radial direction than the cutting surface of the at least two cutting surfaces of each cutting surface, arranged towards the drill tip.Preferably, the cutting surface of each cutting surface, located away from the drill tip, borders an endpoint of the maximum extent of the cutting body perpendicular to the axis of rotation. Preferably, the cutting surface of each cutting surface, located away from the drill tip, is angled circumferentially relative to the cutting surface of each cutting surface, located towards the drill tip, particularly in the opposite direction of rotation.

[0012] The inventive design of the wood drilling device results in an advantageously robust wood drilling device, which is particularly suitable for cutting a large number of metal fragments while drilling the wood material. In particular, advantageous gradual chipping of the wood material and / or the metal fragments can be achieved. An advantageously durable wood drilling device can be achieved. In particular, advantageous drilling of wood materials can be achieved, especially without regard to nail residues or other metal fragments that may be contained in the wood material. Advantageously fast drilling operations can be achieved. In particular, the risk of stress singularities on a radially outer edge of the cutting surfaces can be advantageously reduced, thereby in particular reducing wear. An advantageously low drilling resistance can be achieved.

[0013] Furthermore, it is proposed that the at least two cutting surfaces be designed as planar surfaces. Preferably, the at least two cutting surfaces of each cutting surface are each designed as planar surfaces, wherein, in particular, every point on the surface of one of the at least two cutting surfaces is arranged in a two-dimensional plane, within manufacturing tolerances. Preferably, the at least two cutting surfaces are angled along a direction perpendicular to a maximum extent of the cutting body and perpendicular to the axis of rotation from the drilling plane towards the drill shank. Preferably, the at least two cutting surfaces are angled along a direction perpendicular to a maximum extent of the cutting body and perpendicular to the axis of rotation from the drilling plane towards the drill shank at an angle of at least 2°, preferably at least 5°, in particular within tolerances of a maximum of 1°.Preferably, the at least two cutting surfaces are angled at the same angle along a direction perpendicular to the maximum extent of the cutting body and perpendicular to the axis of rotation from the drilling plane towards the drill shank, particularly to tolerances of a maximum of 1°. This allows for an advantageously robust contact surface between the cutting body and the wood material and / or the metal fragments.

[0014] Furthermore, it is proposed that one of the cutting surfaces of the at least two cutting surfaces, arranged facing the drill tip, has an angle of 5° to the drilling plane, with deviations of a maximum of 2°. Preferably, the at least two cutting surfaces of each cutting surface are angled from the drilling plane towards the drill shank at an angle of at least 2.5°, preferably at least 5°, particularly along an increasing diameter, preferably along the increasing maximum extent of the cutting body perpendicular to the axis of rotation, and in particular with a tolerance of 2°.Preferably, at least one of the at least two cutting surfaces, in particular the cutting surface of the at least two cutting surfaces facing the drill tip, is angled from the drilling plane towards the drill shank at an angle of at least 2.5°, preferably at least 5°, particularly along an increasing diameter, preferably along the increasing maximum extent of the cutting body perpendicular to the axis of rotation, and in particular with a tolerance of a maximum of 2°. This allows for an advantageously sharply defined contact edge, in particular for contact with the wood material and / or the metal fragments, of the cutting surface of the at least two cutting surfaces facing the drill tip.

[0015] Furthermore, it is proposed that one of the cutting surfaces of at least two cutting surfaces, arranged away from the drill tip, has an angle of 45° to the drilling plane, with deviations of a maximum of 5°.

[0016] Preferably, at least one of the at least two cutting surfaces of each cutting surface is angled from the drilling plane towards the drill shank at an angle of at least 30°, preferably at least 35°, particularly preferably at least 40°, and most preferably at least 45°, along an increasing diameter, preferably along the increasing maximum extent of the cutting body perpendicular to the axis of rotation, and particularly with a tolerance of at most 3°. Preferably, the cutting surface of the at least two cutting surfaces of each cutting surface located away from the drill tip is angled from the drilling plane towards the drill shank at an angle of 45°, particularly with a tolerance of at most 5°, and preferably with a tolerance of at most 3°, along an increasing diameter, preferably along the increasing maximum extent of the cutting body perpendicular to the axis of rotation.An advantageously stable edge area of ​​the cutting body, oriented towards the wood material, can be achieved.

[0017] Furthermore, it is proposed that a cutting surface of at least two cutting surfaces arranged facing the drill tip has a maximum extent perpendicular to the axis of rotation that extends at most twice as far as the maximum extent perpendicular to the axis of rotation of a cutting surface of at least two cutting surfaces arranged away from the drill tip. Preferably, the cutting surface of one of the cutting surfaces arranged facing the drill tip has a maximum extent perpendicular to the axis of rotation that extends at least one-third, preferably at least half, particularly preferably at least two-thirds, and most preferably at least exactly as far as the maximum extent perpendicular to the axis of rotation of the cutting surface of one of the cutting surfaces arranged away from the drill tip.Preferably, the cutting surface of one of the cutting surfaces, facing the drill tip, has a maximum extent perpendicular to the axis of rotation that is exactly twice as long as the maximum extent perpendicular to the axis of rotation of the cutting surface of one of the cutting surfaces, facing away from the drill tip. Advantageously large and robust cutting surfaces of the cutting body can be achieved.

[0018] Furthermore, it is proposed that one of the cutting surfaces facing the drill tip has a maximum extent perpendicular to the axis of rotation, which extends at least as far as the maximum extent perpendicular to the axis of rotation of one of the cutting surfaces facing away from the drill tip. Preferably, each of the cutting surfaces has one cutting surface facing the drill tip, in particular a radially inner one, and one cutting surface facing away from the drill tip, in particular a radially outer one.Preferably, the cutting surface facing the drill tip has a maximum extent perpendicular to the axis of rotation that is at least one and a half times, preferably at least 1.75 times, particularly preferably at least 1.8 times, and most preferably at least 1.9 times, as the maximum extent perpendicular to the axis of rotation of the cutting surface facing away from the drill tip, particularly of the same cutting surface. Advantageously large and robust cutting surfaces of the cutting body can be achieved.

[0019] Furthermore, it is proposed that at least one of the cutting wings has at least two radial outer surfaces angled relative to each other via a radial edge extending parallel to the axis of rotation with a maximum deviation of 15°. These outer surfaces are arranged at a free end of the respective cutting wing that is radially away from the axis of rotation and at its maximum distance from the axis of rotation. Preferably, the radial edge extends parallel to the axis of rotation with a maximum deviation of 10°, more preferably 5°. Preferably, the radial edge is arranged on an outer surface of the cutting body that is maximally angled to the axis of rotation, particularly perpendicular to the axis of rotation.Preferably, the radial outer surfaces are arranged on a lateral surface of the cutting body, wherein the lateral surface of the cutting body is defined, in particular, analogously to a lateral surface of the smallest imaginary cylinder, which has a cylinder axis identical to the axis of rotation and which just completely encloses the cutting body. Preferably, the radial edge is arranged on the lateral surface of the cutting body. Preferably, the radial edge is an outer edge of the cutting body that separates the two outer surfaces furthest from the axis of rotation on average, in particular from all outer surfaces of the cutting body. Preferably, the radial outer surfaces are the outer surfaces of the cutting body that are furthest from the axis of rotation on average, in particular from all outer surfaces of the cutting body.Preferably, the cutting element has at least two, preferably exactly two, radial outer surfaces on each cutting wing, angled relative to each other, which are separated from each other, in particular by a radial edge extending parallel to the axis of rotation, in particular with deviations of a maximum of 15°. Preferably, the at least two radial outer surfaces on each cutting wing are angled concavely relative to each other when viewed from the axis of rotation. Preferably, the at least two, preferably exactly two, radial outer surfaces are angled relative to each other at an angle of at least 5°, preferably at least 10°, particularly preferably at least 15°, and most preferably at least 19°, in particular with a tolerance of a maximum of 6°.Preferably, an outer edge other than the radial edge, in particular a radial outer edge, defines at least two, preferably exactly two, radial outer surfaces of which at least partially define the greatest extent of the cutting body perpendicular to the axis of rotation. Preferably, two outer edges other than radial edges, in particular radial outer edges, opposite each other perpendicular to the axis of rotation, define at least two, preferably exactly two, radial outer surfaces of two cutting wings at least partially the greatest extent of the cutting body perpendicular to the axis of rotation. Preferably, the radial outer surfaces are arranged on a radial outer side of the cutting body. Preferably, a radial outer side is a side of the cutting body which is located furthest away from the axis of rotation in the radial direction, in particular from all sides of the cutting body.Preferably, the cutting body has two radial outer surfaces located at roughly the same distance from the axis of rotation. This allows for an advantageously robust radial outer surface of the cutting body, which can be designed in a cost-effective manner.

[0020] Furthermore, a wood drilling system is proposed comprising an electric machine tool and at least one wood drilling device according to the invention. The machine tool is preferably configured to accommodate a wood drilling device according to the invention. Preferably, the machine tool has a tool holder for receiving, and more preferably clamping, a wood drilling device according to the invention. Preferably, the electric machine tool is configured as an electric drill. Advantageous compatibility between the tool holder of the machine tool and the wood drilling device, particularly the drill shank of the wood drilling device, can be achieved.

[0021] Furthermore, a method for manufacturing a wood drilling device according to the invention is proposed. In particular, the method for manufacturing a wood drilling device according to the invention is at least partially designed as a forging process. A suitably high-quality wood drilling device can be achieved.

[0022] Furthermore, it is proposed that in at least one process step the drill unit is forged from a drill head blank, wherein a maximum diameter of the cutting body, in particular measured perpendicular to a longitudinal axis of the drill shank, is at least one and a half times the original diameter of the drill head blank, in particular measured perpendicular to a longitudinal axis of the drill head blank, especially before the forging process. In particular, an original diameter denotes a uniform diameter of a drill head blank before a forging process.Preferably, in at least one process step, the drill unit is forged from the drill head blank with a maximum extent perpendicular to the axis of rotation, wherein the original diameter of the drill head blank, measured particularly perpendicular to a longitudinal axis of the drill head blank, especially before the forging process, is at most two-thirds the size of the maximum extent of the drill unit perpendicular to the axis of rotation and / or to the longitudinal axis of the drill unit. A "longitudinal axis" of an object is understood to be, in particular, an axis that runs parallel to a longest edge of the smallest geometric cuboid that just completely encloses the object and preferably passes through a geometric center point of the object. Alternatively, in at least one process step, the drill shank, the cutting body, and the drill tip can be sintered, additively manufactured, and / or metal powder injection molded from a drill head blank.A cost-effective manufacturing process for the wood drilling device can be achieved.

[0023] The wood drilling device, wood drilling system, and / or method according to the invention are not intended to be limited to the application and embodiment described above. In particular, the wood drilling device, wood drilling system, and / or method according to the invention may, to achieve a functionality described herein, comprise a different number of individual elements, components, units, and process steps than those specified herein. Furthermore, values ​​within the specified limits of the value ranges stated in this disclosure are also considered disclosed and freely usable. drawing

[0024] Further advantages will become apparent from the following description of the drawing. The drawing illustrates an embodiment of the invention. The drawing, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations.

[0025] They show: Fig. 1 a wood drilling system according to the invention with two wood drilling devices according to the invention and a machine tool in a schematic representation, Fig. 2 the wood drilling device according to the invention in a schematic representation, Fig. 3 the wood drilling device according to the invention in a schematic representation, Fig. 4 the wood drilling device according to the invention in a schematic representation, Fig. 5 the wood drilling device according to the invention in a schematic representation, Fig. 6 the wood drilling device according to the invention in a schematic representation, Fig. 7 the wood drilling device according to the invention in a schematic representation, Fig. 8 the wood drilling device according to the invention in a schematic representation, Fig. 9 the wood drilling device according to the invention in a schematic representation, Fig. 10 the wood drilling device according to the invention in a schematic sectional view, Fig.Fig. 11 the wood drilling device according to the invention in a schematic sectional view, Fig. 12 the wood drilling device according to the invention in a schematic sectional view, Fig. 13 the wood drilling device according to the invention in a schematic sectional view, Fig. 14 the wood drilling device according to the invention in a schematic sectional view, Fig. 15 the wood drilling device according to the invention in a schematic sectional view, Fig. 16 the wood drilling device according to the invention in a schematic sectional view, Fig. 17 the wood drilling device according to the invention in a schematic sectional view, Fig. 18 a method according to the invention in a schematic representation, Fig. 19 an alternative wood drilling device according to the invention in a schematic representation and Fig. 20 the alternative wood drilling device according to the invention in a schematic representation. Description of the exemplary embodiment

[0026] Figure 1Figure 200a shows a wood drilling system. The wood drilling system 200a comprises two different wood drilling fixtures 10a and 12a. The wood drilling system 200a includes an electric machine tool 202a for mounting one, for example, of the two, wood drilling fixtures 10a and 12a. The machine tool 202a has a tool holder 204a for mounting, for example, clamping, one of the wood drilling fixtures 10a and 12a. The electric machine tool 202a is designed as an electric drill and / or as a cordless screwdriver or the like.

[0027] A first wood drilling device 10a of the two wood drilling devices 10a, 12a has a maximum diameter 14a perpendicular to an axis of rotation 16a of more than 22.5 mm. In particular, the first wood drilling device 10a has a discrete maximum diameter 14a of 25.8 mm, 28.6 mm or 32.1 mm, especially with a tolerance of no more than 0.3 mm. The first wood drilling device 10a of the two wood drilling devices 10a, 12a has a cutting body 18a with a maximum diameter 14a perpendicular to the axis of rotation 16a of more than 22.5 mm. In particular, the cutting body 18a of the first wood drilling device 10a has a discrete maximum diameter 14a of 25.8 mm, 28.6 mm or 32.1 mm, especially with a tolerance of no more than 0.3 mm.

[0028] A second wood drilling device 12a of the at least two wood drilling devices 10a, 12a has a maximum diameter 20a perpendicular to an axis of rotation 22a of a maximum of 22.5 mm. In particular, the second wood drilling device 12a has a discrete maximum diameter 20a of 13.0 mm, 16.2 mm, 19.4 mm, or 22.5 mm, especially with a tolerance of a maximum of 0.3 mm. The second wood drilling device 12a of the two wood drilling devices 10a, 12a has a cutting body 24a with a maximum diameter 20a perpendicular to the axis of rotation 22a of a maximum of 22.5 mm. In particular, the cutting body 24a of the second wood drilling device 12a has a discrete maximum diameter 20a of 13.0 mm, 16.2 mm, 19.4 mm, or 22.5 mm, especially with a tolerance of a maximum of 0.3 mm.

[0029] The wood drilling devices 10a, 12a each comprise a drill tip 26a, 28a, a cutting body 18a, 24a and a drill shaft 30a, 32a, which together each form a drilling unit 34a, 36a. The drilling units 34a, 36a are, in particular, each made of a material composition. The drilling units 34a, 36a are, in particular, each made of spring steel. The drilling units 34a, 36a are made of the same spring steel.

[0030] The drilling units 34a, 36a have a number of distinguishable hardness zones 38a, 40a, 42a, 44a, 46a, in particular measured according to Rockwell, which depend on a maximum extent 192a of the cutting body 18a, 24a perpendicular to the axis of rotation 16a, 22a, in particular on the maximum diameter 14a, 20a of the wood drilling devices 10a, 12a. The first wood drilling device 10a, in particular a drilling unit 34a of the first wood drilling device 10a, has three distinguishable first hardness zones 38a, 40a, 42a, in particular measured according to Rockwell. The second wood drilling device 12a, in particular a drilling unit 36a of the wood drilling device 12a, has two distinguishable second hardness zones 44a, 46a, in particular measured according to Rockwell. However, another number of hardness ranges, 38a, 40a, 42a, 44a, 46a, which would appear sensible to an expert, would also be conceivable.

[0031] The first wood drilling jig 10a differs from the second wood drilling jig 12a by a different maximum diameter 14a, 20a perpendicular to the axis of rotation 16a, 22a. Different sets of several wood drilling jigs 10a, 12a are provided for different machine tools 202a. For each set of wood drilling jigs 10a, 12a, there is a limit value for the maximum diameter 14a, 20a perpendicular to the axis of rotation 16a, 22a of the wood drilling jigs 10a, 12a, which determines how many distinguishable hardness ranges 38a, 40a, 42a, 44a, 46a the respective wood drilling jig 10a, 12a have. In this example, the limit value for the maximum diameter 14a, 20a perpendicular to the axis of rotation 16a, 22a of the wood drilling jigs 10a, 12a is approximately 22.5 mm.It is conceivable that the limit value for the maximum diameter 14a, 20a perpendicular to the axis of rotation 16a, 22a of the wood drilling devices 10a, 12a, which determines how many distinguishable hardness ranges 38a, 40a, 42a, 44a, 46a the respective wood drilling devices 10a, 12a have, here by way of example two distinguishable hardness ranges 38a, 40a or three distinguishable hardness ranges 42a, 44a, 46a, varies for different machine tools 202a. It is conceivable that the limit value, in particular for the maximum diameter 14a, 20a perpendicular to the axis of rotation 16a, 22a of the wood drilling devices 10a, 12a, which in particular determines how many distinguishable hardness ranges 38a, 40a, 42a, 44a, 46a the respective wood drilling devices 10a, 12a have, may assume values ​​between 5 mm and 50 mm, for example 20 mm, 17.5 mm or 15 mm or also 25 mm, 27.5 mm or 30 mm.For example, the limit value can increase with increasing power of the machine tools 202a due to an increased load on the drill shank 30a, 32a, and decrease with decreasing power of the machine tools 202a due to a reduced load on the drill shank 30a, 32a.

[0032] The wood drilling devices 10a, 12a are designed and specifically intended for drilling, in particular impact drilling, of a wood material, in particular containing metal fragments.

[0033] The wood drilling devices 10a, 12a each comprise a drill shank 30a, 32a. The drill shanks 30a, 32a are, in particular, each designed to be clamped section by section on a machine tool 202a. The wood drilling devices 10a, 12a each comprise a drill tip 26a, 28a. The drill tips 26a, 28a each have, in particular, a thread 48a, 50a. The wood drilling devices 10a, 12a each comprise a cutting element 18a, 24a. The cutting elements 18a, 24a are, in particular, each designed to cut the wood material. The wood drilling devices 10a, 12a each define the axes of rotation 16a, 22a.

[0034] The drilling units 34a, 36a are, in particular, each formed in one piece. Specifically, the drill tip 26a, 28a and the cutting body 18a, 24a of each wood drilling device 10a, 12a are formed in one piece. Specifically, the cutting body 18a, 24a and the drill shank 30a, 32a are formed in one piece. Specifically, one-piece objects are manufactured from a single blank using a forging process.

[0035] The first wood drilling device 10a is described below as representative of both wood drilling devices 10a, 12a.

[0036] The drill tip 26a is connected to the cutting body 18a at an end opposite the drill shank 30a. The drill shank 30a is connected to the cutting body 18a at an end opposite the drill tip 26a. The drilling unit 34a is materially symmetrical about the axis of rotation 16a. In this example, the drilling unit 34a is free of internal cavities. In the case of a sintered drilling unit 34a, it is conceivable that the drilling unit 34a may contain cavities, particularly due to the manufacturing process. The drilling unit 34a extends materially along the axis of rotation 16a, wherein a section of the axis of rotation 16a between an end of the drill tip 26a facing away from the drill shaft 30a and an end of the drill shaft 30a facing away from the drill tip 26a runs exclusively through a material part of the drilling unit 34a.The cutting body 18a has a larger maximum radius, in particular diameter 14a, in particular a larger maximum extent 192a perpendicular to the axis of rotation 16a, than the drill shank 30a.

[0037] Figure 2 Figure 1 shows that the drill shank 30a has a shank body 52a and a tool connecting body 54a. The drill shank 32a has a shank body 52a. The drill shank 32a has a tool connecting body 54a. The shank body 52a and the tool connecting body 54a are directly connected to each other. The shank body 52a and the tool connecting body 54a are formed in one piece. A maximum extent 56a of the shank body 52a is in Figure 2 shown. A maximum extent 58a of the tool connecting body 54a is in Figure 2The shank body 52a has a uniform diameter 88a in this example. The cutting body 18a has a larger diameter at one boundary with the shank body 52a, in particular a larger maximum extent 192a perpendicular to the axis of rotation 16a, than the shank body 52a. The shank body 52a has a larger diameter at one boundary with the tool connecting body 54a, in particular a larger maximum extent 192a perpendicular to the axis of rotation 16a, than the tool connecting body 54a.

[0038] The shank body 52a is arranged between the tool connecting body 54a and the cutting body 18a. The shank body 52a has two different hardness zones 40a, 42a, in particular measured according to Rockwell. The shank body 52a has a uniform diameter 88a, which is smaller than a maximum diameter 14a of the cutting body 18a, in particular than a maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a. The shank body 52a has a uniform diameter 88a, which is smaller than an average diameter of the cutting body 18a, in particular than an average maximum extent 192a of the cutting body 18a taken along the axis of rotation 16a perpendicular to the axis of rotation 16a. The shaft body 52a has a uniform diameter 88a, which is larger than a maximum diameter 90a of the drill tip 26a.The shank body 52a has a uniform diameter 88a, which is larger than the average diameter of the drill tip 26a. The shank body 52a connects the cutting body 18a to the tool connecting body 54a. The cutting body 18a is spaced from the tool connecting body 54a by a maximum extent 56a of the shank body 52a along the axis of rotation 16a.

[0039] The tool connecting body 54a is designed for sectional clamping on the machine tool 202a. An operating state of the wood drilling device 10a is a state in which the wood drilling device 10a is clamped on the machine tool 202a and driven by the machine tool 202a to rotate about the axis of rotation 16a. In this example, the shank body 52a has a uniformly sized cross-section perpendicular to the axis of rotation 16a. The shank body 52a is arranged between the cutting body 18a and the tool connecting body 54a. The shank body 52a has a circular outer contour in a cross-section perpendicular to the axis of rotation 16a.

[0040] The tool connector 54a has a transition area 60a and a coupling area, in particular a hex area 62a. Only the hex area 62a of the tool connector 54a is intended for clamping on the machine tool 202a. The hex area 62a is designed, in particular shaped, for clamping on the machine tool 202a. The tool connector 54a has a cross-section perpendicular to the axis of rotation 16a with a hexagonal outer contour in the hex area 62a. The transition area 60a is arranged between the hex area 62a and the shank body 52a.The tool connecting body 54a has various cross-sections perpendicular to the axis of rotation 16a in the transition area 60a, the cross-sections having an outer contour that forms a continuous transition between a hexagonal outer contour like the tool connecting body 54a and a circular outer contour like that of the shank body 52a. The hex section 62a forms an end of the drilling unit 34a facing away from the drill tip 26a. The hex section 62a has a partial hex section 64a in which the hex section 62a is tapered to allow for a snap-fit ​​clamping on the machine tool 202a.

[0041] In particular, the hex region 62a in the sub-hex region 64a has a cross-section perpendicular to the axis of rotation 16a, which has a non-uniformly shaped outer contour. In particular, the hex region 62a in the sub-hex region 64a has a cross-section perpendicular to the axis of rotation 16a, which has an outer contour other than hexagonal, in particular a circular outer contour.

[0042] The cutting body 18a has two cutting wings 66a, 68a arranged symmetrically to each other with respect to the axis of rotation 16a of the cutting body 18a, in particular in a twofold symmetrical arrangement. A maximum radius, in particular a diameter 14a, in particular a maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a, of the drilling unit 34a, in particular the wood drilling device 10a, is formed on the cutting wings 66a, 68a with respect to the axis of rotation 16a. The two cutting wings 66a, 68a are arranged opposite each other with respect to the axis of rotation 16a. A cutting wing 66a, 68a is to be interpreted as a part of the cutting body 18a which projects radially in a direction from the axis of rotation 16a, in particular opposite a central section of the cutting body 18a in which the cutting body 18a is formed completely symmetrically around the axis of rotation 16a.The cutting body 18a has non-uniform maximum transverse extensions, in particular non-uniform maximum diameters 14a, perpendicular to the axis of rotation 16a when viewed along the axis of rotation 16a.

[0043] The cutting body 18a has a base side 70a. The base side 70a is defined in relation to a smallest imaginary cylinder 72a, which has a cylinder axis identical to the axis of rotation 16a, and which just completely encloses the cutting body 18a (cf. Figure 3 The base side 70a of the cutting body 18a is a side of the cutting body 18a which faces the drill tip 26a and which is aligned with a base side 70a of the smallest imaginary cylinder 72a. The base side 70a of the cutting body 18a defines an imaginary drilling plane 74a (cf. Fig. 2 and Fig. 3The drilling plane 74a is an imaginary plane oriented perpendicular to the axis of rotation 16a and located at one end of the cutting body 18a facing the drill tip 26a, between the drill tip 26a and the cutting body 18a. The imaginary drilling plane 74a is directly adjacent to the cutting body 18a.

[0044] The drill unit 34a comprises at least two distinguishable hardness ranges 38a, 40a, 42a, in particular measured according to Rockwell. The drill shaft 30a has a partially different hardness than the drill tip 26a, in particular measured according to Rockwell. The drill unit 34a comprises at least two distinguishable hardness ranges 38a, 40a, 42a, in particular measured according to Rockwell, which differ by more than 10 HRC. The at least two distinguishable hardness ranges 38a, 40a, 42a differ by at least 10 HRC, in particular measured according to Rockwell. Distinguishable hardness ranges 38a, 40a, 42a are separated from each other by at least one hardness limit 98a.

[0045] A hardness area 38a, which comprises at least two hardness areas 38a, 40a, 42a, is formed as a peak hardness area 76a. The peak hardness area 76a is formed by the drill tip 26a and the cutting body 18a.

[0046] In this example, the drill tip 26a and the cutting body 18a have the same hardness, specifically as measured by Rockwell. The drill tip 26a and the cutting body 18a form the tip hardness region 76a, which has a uniform hardness. The hardness of the tip hardness region 76a differs from the hardness of the drill shank 30a, particularly its average hardness.

[0047] A hardness range 38a, comprising at least two hardness ranges 38a, 40a, 42a, in particular the peak hardness range 76a, has a hardness of at least 53 HRC, in particular measured according to Rockwell. A hardness range 38a, comprising at least two hardness ranges 38a, 40a, 42a, in particular the peak hardness range 76a, has a hardness of at most 58 HRC, in particular measured according to Rockwell. A hardness range 38a, comprising at least two hardness ranges 38a, 40a, 42a, in particular the peak hardness range 76a, has a hardness between 53 HRC and 58 HRC, in particular measured according to Rockwell.

[0048] At least one hardness area 40a, 42a of the at least two hardness areas 38a, 40a, 42a is designed as a shank hardness area 78a, which for the first wood drilling device 10a is formed by the shank body 52a or the tool connecting body 54a and for the second wood drilling device 12a is formed by the shank body 52a and the tool connecting body 54a.

[0049] At least one hardness range 40a, 42a of at least two hardness ranges 38a, 40a, 42a, in particular the shaft hardness range 78a, has a hardness of at least 30 HRC, in particular measured according to Rockwell. At least one hardness range 40a, 42a of at least two hardness ranges 38a, 40a, 42a, in particular the shaft hardness range 78a, has a hardness of at most 58 HRC, in particular measured according to Rockwell. At least one hardness range 40a, 42a of at least two hardness ranges 38a, 40a, 42a, in particular the shaft hardness range 78a, has a hardness between 30 HRC and 40 HRC for the second wood drilling device 12a and a hardness between 30 HRC and 45 HRC or between 53 HRC and 58 HRC for the first wood drilling device 10a, in particular measured according to Rockwell.

[0050] For the first wood drilling device 10a only, the shank hardness area 78a is formed by two partial shank hardness areas 80a, 82a, in particular a shank body hardness area 84a, which is formed entirely by the shank body 52a, and a tool connecting body hardness area 86a, which is formed mostly by the tool connecting body 54a and partly by the shank body 52a. For the second wood drilling device 10a, the shank hardness area 78a is designed as an area with a uniform, in particular constant, hardness.

[0051] A partial stock hardening area 80a, of which at least two partial stock hardening areas 80a, 82a, in particular the stock body hardening area 84a, has a hardness of at least 30 HRC, in particular measured according to Rockwell. A partial stock hardening area 80a, of which at least two partial stock hardening areas 80a, 82a, in particular the stock body hardening area 84a, has a hardness of at most 45 HRC, in particular measured according to Rockwell. A partial stock hardening area 80a, of which at least two partial stock hardening areas 80a, 82a, in particular the stock body hardening area 84a, has a hardness between 30 HRC and 45 HRC, in particular measured according to Rockwell.

[0052] A partial shank hardening area 82a of at least two partial shank hardening areas 80a, 82a, in particular the tool connecting body hardening area 86a, has a hardness of at least 53 HRC, in particular measured according to Rockwell. A partial shank hardening area 82a of at least two partial shank hardening areas 80a, 82a, in particular the tool connecting body hardening area 86a, has a hardness of at most 58 HRC, in particular measured according to Rockwell. A partial shank hardening area 82a of at least two partial shank hardening areas 80a, 82a, in particular the tool connecting body hardening area 86a, has a hardness between 53 HRC and 58 HRC, in particular measured according to Rockwell.

[0053] The hardness of the tip hardness range 76a differs from the hardness of the shank hardness range 78a, in particular the shank body hardness range 84a and / or the tool connecting body hardness range 86a, by at least 8 HRC.

[0054] The wood drilling device 10a has a coating that partially encases the drilling unit 34a. The coating is made of a material composition that differs from that of the drilling unit 34a. In particular, the cutting body 18a and the drill tip 26a, as part of the drilling unit 34a, are encased in the coating.

[0055] The shank body 52a and the tool connector body 54a exhibit different average hardnesses, particularly as measured by Rockwell. The shank body hardness range 84a and the tool connector body hardness range 86a exhibit different hardnesses. The shank body hardness range 84a and the tool connector body hardness range 86a exhibit different hardnesses that differ by at least 10 HRC.

[0056] The shank body 52a partially forms the shank body hardness area 84a and the tool connecting body hardness area 86a. The shank body 52a partially exhibits the shank body hardness area 84a and the tool connecting body hardness area 86a.

[0057] A portion of the shank body 52a forms, in particular, the entire shank body hardening region 84a. The portion of the shank body 52a forming the shank body hardening region 84a extends from the cutting body 18a along the axis of rotation 16a by a length 92a towards the tool connecting body 54a, which is shorter than the maximum length 56a of the shank body 52a. The shank body hardening region 84a is formed exclusively by the shank body 52a. A large portion 94a of the shank body 52a facing the cutting body 18a forms the entire shank body hardening region 84a. The large portion 94a comprises a maximum of 96% of the shank body 52a by volume, in particular from an end of the shank body 52a facing the cutting body 18a. It is also conceivable that the majority comprises less than 96%, in particular a maximum of 80%, of the shaft body 52a by volume, especially from an end of the shaft body 52a facing the cutting body 18a.

[0058] A portion of the shank body 52a partially forms the tool connector hardening area 86a. A minority portion 96a of the shank body 52a, facing the tool connector 54a, forms the tool connector hardening area 86a to at least 4%, and in particular at least 20%, by volume. The minority portion 96a is an end of the shank body 52a facing the tool connector 54a.

[0059] The shank body 52a has a hardness limit 98a. The hardness limit 98a divides the shank body 52a into two hardness zones 40a and 42a with different hardnesses. The hardness limit 98a is located at a distance from the tool connecting body 54a.

[0060] The hardness limit 98a separates the tool connecting body hardness area 86a from the shank body hardness area 84a. The hardness limit 98a is located at least 3 mm away from one end, in particular an end facing the tool connecting body 54a, of the shank body 52a.

[0061] The hardening limit 98a runs perpendicular to the axis of rotation 16a. The shank body 52a is part of the drill shank 30a with a uniform diameter 88a, located between the cutting body 18a, which has a larger average diameter, and the tool connecting body 54a, which has a smaller average diameter. The shank body 52a terminates along the axis of rotation 16a precisely where the diameter of the drilling unit 34a changes. The hardening limit 98a is positioned at a distance from a geometric boundary between the shank body 52a and the tool connecting body 54a.

[0062] The shaft body 52a and the tool connecting body 54a have different average diameters. The shaft body 52a has a uniform diameter 88a, which is larger than the average diameter of the tool connecting body 54a. The tool connecting body 54a has a smaller diameter 100a at an end facing away from the shaft body 52a, in particular a smaller maximum extent perpendicular to the axis of rotation 16a, than the shaft body 52a.

[0063] The transition area 60a is located between the shaft body 52a and the hex area 62a. The transition area 60a has different diameters.

[0064] The tool connecting body 54a has a hex section 62a on a side facing away from the shank body 52a, in particular at its end. In the hex section 62a, the tool connecting body 54a has a hexagonal outer contour in a cross-section perpendicular to the axis of rotation 16a. The tool connecting body 54a has a transition section 60a on a side facing the shank body 52a, in particular at its end. In the transition section 60a, the tool connecting body 54a has a circular outer contour in a cross-section perpendicular to the axis of rotation 16a. The tool connecting body 54a has a diameter in the transition area 60a, in particular maximum extensions perpendicular to the axis of rotation 16a, which is between a diameter 100a, in particular maximum extensions perpendicular to the axis of rotation 16a, of the hex area 62a and the diameter 88a, in particular maximum extensions perpendicular to the axis of rotation 16a, of the shaft body 52a.The transition area 60a has a maximum extent parallel to the axis of rotation 16a of a maximum of 15 mm. The transition area 60a has a minimum extent parallel to the axis of rotation 16a of at least 5 mm.

[0065] The tool connector 54a has a tapered section 102a. The transition section 60a is partially formed as the tapered section 102a. In the tapered section 102a, the diameter 100a of the tool connector 54a is linearly adapted from the diameter 100a, in particular the maximum extent 192a perpendicular to the axis of rotation 16a, of the hex section 62a to the diameter 88a, in particular the maximum extent perpendicular to the axis of rotation 16a, of the shank body 52a. The outer contour of the tapered section 102a forms a 10° angle to the axis of rotation 16a. The outer contour of the tapered section 102a can form an angle between 6° and 15° to the axis of rotation 16a.

[0066] The transition area 60a has a maximum extent parallel to the axis of rotation 16a of a maximum of 10 mm. The tapered area 102a has a minimum extent parallel to the axis of rotation 16a of at least 3 mm.

[0067] The tapered section 102a has a circular cross-section perpendicular to the axis of rotation 16a. The hex section 62a has six toothed elements 104a at one end facing the tapered section 102a.

[0068] The gear elements 104a are arranged on the hex section 62a such that the hexagonal cross-section of the hex section 62a, which it has at an end facing away from the tapered section 102a, matches the round cross-section of the tapered section 102a. The gear elements 104a are integrally formed with the tool connecting body 54a, particularly on the hex section 62a and the transition section 60a. One gear element 104a is arranged on the outside of each outer surface of the hexagonal outer contour of the hex section 62a. The gear elements 104a extend in a tooth-like fashion from the transition section 60a along the axis of rotation 16a to the hex section 62a.

[0069] The cutting body 18a has a chip removal surface 106a on at least one outer surface 110a, 112a, which is defined in particular with respect to the imaginary cylinder 72a about the axis of rotation 16a, for removing wood material and / or metal fragments. The cutting body 18a has a chip removal surface 108a on at least one outer surface 110a, 112a, which is defined in particular with respect to the imaginary cylinder 72a about the axis of rotation 16a, for removing wood material and / or metal fragments. The chip removal surface 108a is designed to convey chips along the axis of rotation 16a in the direction of the drill shank 30a, away from the axis of rotation 16a.

[0070] The cutting body 18a has two outer surfaces 110a, 112a. The outer surfaces 110a, 112a of the cutting body 18a are, on the outer surface of the cylinder 72a, the sides of the cutting body 18a that face the largest outer surfaces of a smallest imaginary cuboid 114a. The two outer surfaces 110a, 112a are analogous to each other, in particular identical, and in particular symmetrical to each other.

[0071] The two outer surfaces of the casing 110a, 112a each have a chip surface 106a for chipping away the wood material and / or the metal fragments and a chip conveying surface 108a, which adjoins the chip surface 106a and which is partly concave and partly convex.

[0072] The cutting wings 66a, 68a each have a cutting surface 116a, 118a. The cutting surfaces 116a, 118a are arranged spaced apart from the axis of rotation 16a by a maximum thickness, in particular diameter 90a, of the drill tip 26a, measured in particular perpendicular to the axis of rotation 16a.

[0073] The cutting surfaces 116a, 118a are arranged on the base side 70a facing the drill tip 26a, which is defined in particular with respect to the imaginary cylinder 72a about the axis of rotation 16a. The two cutting surfaces 116a, 118a on the cutting body 18a are arranged symmetrically to each other about the axis of rotation 16a.

[0074] An edge 120a of the cutting surface 116a, 118a is designed to remove, cut, and / or machine the wood material and / or the metal fragments in the wood material, particularly during the operation of the wood drilling device 10a. The edge 120a of the cutting surface 116a, 118a is designed as an edge 120a facing the chipping surface 106a. The edge 120a of the chipping surface 106a facing the cutting surface 116a, 118a is designed to remove, cut, and / or machine the wood material and / or the metal fragments in the wood material, particularly during the operation of the wood drilling device 10a.

[0075] The cutting surfaces 116a, 118a, preferably each, are formed by two directly adjacent cutting surfaces 122a, 124a, 126a, 128a, which in particular form a common boundary cutting edge 190a. The cutting surfaces 116a, 118a, preferably each, are formed by at least two, preferably exactly two, particularly along an increasing diameter 14a, adjacent cutting surfaces 122a, 124a, 126a, 128a, which are angled from the drilling plane 74a in the direction of the drill shank 30a.

[0076] The two cutting surfaces 122a, 124a, 126a, 128a of, in particular each, cutting surfaces 116a, 118a are angled relative to each other at an angle 130a. The two cutting surfaces 122a, 124a, 126a, 128a of, in particular each, cutting surfaces 116a, 118a are angled relative to each other at an angle 130a of 40° (cf. Fig. 2The two cutting surfaces 122a, 124a, 126a, 128a of, in particular each, cutting surfaces 116a, 118a are arranged adjacent to one another without offset, in particular along the axis of rotation 16a. The two cutting surfaces 122a, 124a, 126a, 128a of, in particular each, cutting surfaces 116a, 118a are arranged adjacent to one another. The two cutting surfaces 122a, 124a, 126a, 128a of, in particular each, cutting surfaces 116a each have an angle other than 0° to the axis of rotation 16a. The two cutting surfaces 122a, 124a, 126a, 128a of, in particular each, cutting surfaces 116a, 118a each have an angle 132a, 134a to the axis of rotation 16a that is different from 0°, 90° or 180°.

[0077] The two cutting surfaces 122a, 124a, 126a, 128a of, in particular each, cutting surfaces 116a, 118a are angled from the drilling plane 74a, which is oriented perpendicular to the axis of rotation 16a, in the direction of the drill shaft 30a.

[0078] The two cutting surfaces 122a, 124a, 126a, 128a are designed as planar surfaces. The two cutting surfaces 122a, 124a, 126a, 128a, in particular each cutting surface 116a, 118a, are each designed as planar surfaces, wherein in particular every point on the surface of the two cutting surfaces 122a, 124a, 126a, 128a, in particular each cutting surface 116a, 118a, is arranged in a two-dimensional plane, except for manufacturing tolerances. The two cutting surfaces 122a, 124a, 126a, 128a are, in particular, each angled along a direction perpendicular to a maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a from the drilling plane 74a in the direction of the drill shaft 30a.

[0079] The two cutting surfaces 122a, 124a, 126a, 128a are, in particular, each angled along a direction perpendicular to a maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a from the drilling plane 74a towards the drill shank 30a at an angle 132a, 134a of at least 5°, in particular to tolerances of a maximum of 1°. The two cutting surfaces 122a, 124a, 126a, 128a are angled along a direction perpendicular to a maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a from the drilling plane 74a towards the drill shank 30a at the same angle, in particular to tolerances of a maximum of 1°.

[0080] The cutting surfaces 122a, 126a of the cutting surfaces 122a, 124a, 126a, 128a, which are arranged facing the drill tip 26a, have an angle 132a of 5° to the drilling plane 74a, except for deviations of a maximum of 2°.

[0081] The two cutting surfaces 122a, 124a, 126a, 128a of each cutting surface 116a, 118a are angled, in particular along an increasing diameter 14a, preferably along the increasing greatest extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a, from the drilling plane 74a in the direction of the drill shank 30a at an angle 132a, 134a of at least 5°, in particular with a tolerance of 2°.

[0082] The cutting surfaces 124a, 128a of the cutting surfaces 122a, 124a, 126a, 128a, which are arranged away from the drill tip 26a, have an angle 134a of 45° to the drilling plane 74a, except for deviations of a maximum of 5°.

[0083] The cutting surfaces 124a, 128a of the cutting surfaces 122a, 124a, 126a, 128a, which are arranged facing away from the drill tip 26a, are angled along an increasing diameter 14a, preferably along the increasing maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a, from the drilling plane 74a in the direction of the drill shaft 30a at an angle 134a of 45°, in particular with a tolerance of a maximum of 3°.

[0084] The cutting surfaces 122a, 126a of the cutting surfaces 122a, 124a, 126a, 128a, which are arranged facing the drill tip 26a, have a maximum extent 136a perpendicular to the axis of rotation 16a, which extends twice as far as a maximum extent 138a perpendicular to the axis of rotation 16a of a cutting surface 124a, 128a of the two cutting surfaces 122a, 124a, 126a, 128a of each cutting surface 116a, 118a.

[0085] The cutting wings 66a, 68a have two radial outer surfaces 142a, 144a angled relative to each other via a radial edge 140a. The radial outer surfaces 142a, 144a are arranged at a free end of the respective cutting wing 66a, 68a that is radially away from and at the maximum distance from the axis of rotation 16a. The radial edge 140a extends parallel to the axis of rotation 16a, with deviations of up to 10°. The radial outer surfaces 142a, 144a are arranged at a free end of the respective cutting wing 66a, 68a that is radially away from and at the maximum distance from the axis of rotation 16a. The radial edge 140a is arranged on an outer surface 146a of the cutting body 18a that is spaced at a maximum distance from the axis of rotation 16a perpendicular to the axis of rotation 16a. The radial outer surfaces 142a, 144a are the outer surfaces of the cutting body 18a which are on average furthest away from the axis of rotation 16a, in particular from all outer surfaces of the cutting body 18a.The radial outer surfaces 142a, 144a are arranged on a radial outer side 148a of the cutting body 18a. The radial outer side 148a is a side of the cutting body 18a which is located furthest away from the axis of rotation 16a in the radial direction, in particular from all sides of the cutting body 18a.

[0086] The cutting body 18a has two radial outer surfaces 148a that are on average equally far from the axis of rotation 16a.

[0087] The radial outer surfaces 142a, 144a are arranged on a lateral surface of the cutting body 18a, wherein the lateral surface of the cutting body 18a is defined, in particular, analogously to a lateral surface of the smallest imaginary cylinder 72a, which has a cylinder axis identical to the axis of rotation 16a and which just completely encloses the cutting body 18a. The radial edge 140a is arranged on the lateral surface of the cutting body 18a. The radial edge 140a is an outer edge of the cutting body 18a, which separates the two outer surfaces furthest from the axis of rotation 16a on average, in particular from all outer surfaces of the cutting body 18a.

[0088] The cutting body 18a has two mutually angled radial outer surfaces 142a, 144a on each cutting wing 66a, 68a, which are separated from each other, in particular, by a radial edge 140a that extends parallel to the axis of rotation 16a, in particular with deviations of a maximum of 10°. The two radial outer surfaces 142a, 144a on each cutting wing 66a, 68a are each angled concavely towards each other when viewed from the axis of rotation 16a. The two radial outer surfaces 142a, 144a are angled at an angle of 19° to each other, in particular with a tolerance of a maximum of 6°. An outer edge different from the radial edge 140a, in particular a radial outer edge 210a, of the two radial outer surfaces 142a, 144a defines the greatest extent 192a, in particular the maximum diameter 14a, of the cutting body 18a perpendicular to the axis of rotation 16a.Two outer edges 140a, in particular radial outer edges 210a, of the two radial outer surfaces 142a, 144a of the two cutting wings 66a, 68a, which are opposite each other perpendicular to the axis of rotation 16a, define the greatest extent 192a, in particular the maximum diameter 14a, of the cutting body 18a perpendicular to the axis of rotation 16a.

[0089] The chip-carrying surface 108a adjoins the chip-carrying surface 106a. The chip-carrying surface 106a is completely concave. The chip-carrying surface 106a adjoins a cutting surface 116a, 118a. The chip-carrying surface 106a and the chip-carrying surface 108a are separated from each other by a projecting edge, in particular a boundary edge 150a. The chip-carrying surfaces 106a each adjoin the drill tip 26a, one of the cutting surfaces 116a, 118a, in particular two cutting surface areas 122a, 124a, 126a, 128a, one radial outer surface 142a of the two radial outer surfaces 142a, 144a and the chip-carrying surface 108a.

[0090] Each chip conveying surface 108a extends from the drill tip 26a to within less than 10 mm of the drill shank 30a, in particular to the shank body 52a.

[0091] Each chip conveying surface 108a extends along the axis of rotation 16a over at least 95% of a maximum extent 152a of the cutting body 18a from the drill tip 26a in the direction of the drill shank 30a over the cutting body 18a (cf. Fig. 2 ).

[0092] The chip conveying surface 108a is partially concave and partially convex. Along its surface, viewed perpendicular to the axis of rotation 16a, the chip conveying surface 108a is continuously partially concave and partially convex. The chip conveying surface 108a is more convex at one end facing the drill shank 30a. The chip conveying surface 108a is more concave at the other end facing the drill shank 30a. A center point 194a, 194a' of an extension of the chip conveying surface 108a perpendicular to the axis of rotation 16a on the chip conveying surface 108a is located closer to the axis of rotation 16a at the drill tip 26a than at the drill shank 30a (cf. Figure 3 ).

[0093] The cutting body 18a has, on its outer surfaces 110a, 112a, in particular, a raised edge 154a, which extends from an end region of the cutting body 18a facing the drill tip 26a to an end region of the cutting body 18a facing the drill shank 30a and which, on average, has a different distance 160a to a plane 158a spanned by the axis of rotation 16a at the end region of the cutting body 18a facing the drill tip 26a, which is oriented perpendicular to the axis of rotation 16a except for a deviation of a maximum of 25° perpendicular to a maximum extent 192a, in particular the maximum diameter 14a, of the cutting body 18a, than at an end region of the cutting body 18a facing the drill shank 30a (cf. Fig. 2 ).

[0094] The two outer surfaces of the mantle 110a, 112a each have a raised edge 154a. The raised edges 154a are outwardly projecting edges of the outer surfaces of the mantle 110a, 112a, in particular of the cutting body 18a. The two raised edges 154a are symmetrical to each other, in particular with respect to the axis of rotation 16a. Specifically, the raised edges 154a are edges on the outer surfaces of the mantle 110a, 112a, which are formed by local material high points 156a, in particular of the cutting body 18a, extending away from the axis of rotation 16a in a central region of the greatest extent of the outer surface of the mantle 110a, 112a perpendicular to the axis of rotation 16a.The two raised edges 154a exhibit, on average, a greater distance 160a to the plane 158a spanned by the axis of rotation 16a at the end region of the cutting body 18a facing the drill tip 26a, which is oriented perpendicular to the axis of rotation 16a except for a maximum deviation of 25° perpendicular to a maximum extent 192a of the cutting body 18a, than at an end region of the cutting body 18a facing the drill shaft 30a (cf. . Fig. 2The raised edge 154a, particularly with respect to its length, delimits at least one chip conveying surface 108a from another outer surface of the outer shell 110a, 112a, in particular a back surface 162a. The raised edges 154a have an arc-shaped profile when viewed along the axis of rotation 16a. The raised edges 154a delimit the chip conveying surface 108a from the back surface 162a of the outer shell 110a, 112a. Over each outer surface of the jacket 110a, 112a, a raised edge 154a extends from the end of the cutting body 18a facing the drill tip 26a to the end of the cutting body 18a facing the drill shank 30a, which delineates the chip conveying surface 108a from the back surface 162a of the outer surface of the jacket 110a, 112a, wherein the raised edges 154a have an arc-shaped course when viewed along the axis of rotation 16a.

[0095] The raised edges 154a are formed by the high points 156a of the outer surfaces 110a, 112a of the mantle, wherein the high points 156a are defined with respect to a body plane along the axis of rotation 16a and the maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a, in particular the maximum diameter 14a of the cutting body 18a. In a cross-section perpendicular to the axis of rotation 16a, the high points 156a are the points on the outer surfaces 110a, 112a of the mantle that have the greatest distance to the body plane in the respective cross-section. Due to its arc-shaped profile, the raised edge 154a has a greater maximum extent than the maximum extent 152a of the cutting body 18a parallel to the axis of rotation 16a.

[0096] The rake face 106a is located on the outer surface 110a of the cutting body 18a at one end of the cutting body 18a facing the drill tip 26a. The rake face 106a forms a constant rake angle 168a of 18° to the axis of rotation 16a for a large portion of its length.

[0097] The rake face 106a is formed by a transition region 164a and a constant region 166a. At one end of the rake face 106a facing the drill tip 26a, the rake face 106a forms a constant rake angle 168a of 18° to the axis of rotation 16a, in particular with a tolerance of a maximum of 4° (see figure). Fig. 4). Figure 4Figure 1 shows, in particular, an auxiliary line 188a which runs parallel to the axis of rotation 16a. The transition area 164a is rounded. Except in the rounded transition area 164a, the rake face 106a forms a constant rake angle 168a of 18° to the axis of rotation 16a, particularly with a tolerance of a maximum of 4°, with respect to the chip conveying surface 108a. The constant area 166a is a region of the rake face 106a with a flat outer surface, which in particular forms the constant rake angle 168a of 18°. The transition area 164a is a region of the rake face 106a in which the rake face 106a is curved, in particular rounded, in particular to form a sliding transition for chips from the rake face 106a to the chip conveying surface 108a.

[0098] The transition area 164a is designed as an inwardly curved region of the rake face 106a, particularly with respect to the cutting body 18a, wherein the center point of a rounding is arranged, in particular, outside the cutting body 18a, especially on a side of the cutting body 18a facing the corresponding rake face 106a. The constant area 166a is designed as an inwardly chamfered region of the rake face 106a, particularly with respect to the cutting body 18a, preferably at a rake angle 168a of 18° to the axis of rotation 16a, particularly with a tolerance of a maximum of 4°. The transition area 164a of the rake face 106a is designed as an inwardly rounded region of the rake face 106a.

[0099] The rake face 106a extends along the radial outer surfaces 142a, 144a more than half as far along the axis of rotation 16a as the maximum extent 192a, in particular the maximum diameter 14a, of the cutting body 18a perpendicular to the axis of rotation 16a. The rake face 106a extends radially from a center of the outer surface 110a, in particular of the cutting body 18a, to an end of the outer surface 110a, in particular of the cutting body 18a.

[0100] The chip surface 106a is delimited from the chip conveying surface 108a by the boundary edge 150a. The boundary edge 150a is designed as a protruding edge. The boundary edge 150a runs at least partially between the transition area 164a of the chip surface 106a and the chip conveying surface 108a.

[0101] The chip-discharge surface 108a is less concavely curved at one end facing the drill tip 26a than at one end of the chip-discharge surface 108a facing the drill shank 30a. The two chip-discharge surfaces 108a are curved along the maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a, in particular the maximum diameter 14a, and are formed partly concave, in particular inwards with respect to the cutting body 18a, and partly convex, in particular outwards with respect to the cutting body 18a.

[0102] The chip conveying surface 108a has in each cross-section parallel to the drilling plane 74a, in particular perpendicular to the axis of rotation 16a, a point, in particular a low point 172a, which is located furthest away from an imaginary connecting line 170a of the, in particular radial, endpoints of the chip conveying surface 108a (schematically indicated in Fig. 2). The low points 172a of the chip conveying surface 108a are, on average, less far from the imaginary connecting line 170a of the, in particular radial, end points of the chip conveying surface 108a in an end region facing the drill tip 26a, in particular of the chip conveying surface 108a, than in an end region of the chip conveying surface 108a facing the drill shaft 30a.

[0103] The chip-conveying surface 108a has a local convex shape in cross-section perpendicular to the axis of rotation 16a in a region between an endpoint facing the axis of rotation 16a and the low point 172a. An opening angle 174a measured in cross-section perpendicular to the axis of rotation 16a at the respective low point 172a is larger in the end region of the chip-conveying surface 108a facing the drill tip 26a than in the end region of the chip-conveying surface 108a facing the drill shank 30a. The change in the opening angle 174a of the chip-conveying surface 108a along the axis of rotation 16a, starting at the drill tip 26a, is continuously decreasing.

[0104] The cutting body 18a has a maximum thickness 176a in a cross-section perpendicular to the axis of rotation 16a in a body region facing the drill tip 26a, which is oriented perpendicular to the axis of rotation 16a and, with a deviation of a maximum of 15°, perpendicular to the maximum extent 192a of the cutting body 18a, and which intersects an imaginary connecting axis 178a through the raised edges 154a in the cross-section (cf. Fig. 5The maximum thickness 176a of the cutting body 18a is perpendicular to the axis of rotation 16a and, with a maximum deviation of 15°, is oriented perpendicular to the maximum extent 192a of the cutting body 18a. The imaginary connecting axis 178a through the raised edges 154a intersects the maximum thickness 176a of the cutting body 18a at exactly one point in every cross-section perpendicular to the axis of rotation 16a, specifically in the central 75% of the cutting body 18a measured by volume along the axis of rotation 16a. The body area comprises a maximum of 75% of the cutting body 18a by volume from one end of the cutting body 18a facing the drill tip 26a. Figures 5 to 20 For clarity, not all reference symbols have been assigned.

[0105] The cutting wings 66a, 68a exhibit, in a cross-section perpendicular to the axis of rotation 16a, a smaller extent 180a perpendicular to the axis of rotation 16a, and, with a maximum deviation of 15° perpendicular to a maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a, in a central region of the extent 152a of the cutting body 18a along the axis of rotation 16a, particularly in the middle 30% of the cutting body 18a measured by volume along the axis of rotation 16a, and, with a maximum deviation of 15° perpendicular to the largest extent 192a, particularly to the maximum diameter 14a, of the cutting body 18a perpendicular to the axis of rotation 16a, than in an end region of the cutting body 18a facing the drill tip 26a (cf. Fig. 6 ).

[0106] The two cutting wings 66a, 68a each have, in a cross-section, up to a maximum deviation of 15° perpendicular to the largest extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a in the middle region of the maximum extent 152a of the cutting body 18a along the axis of rotation 16a, in particular in the middle 30% of the cutting body 18a measured by volume along the axis of rotation 16a, a smaller extent 180a perpendicular to the axis of rotation 16a and up to a maximum deviation of 15° perpendicular to the largest extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a than in an end region of the cutting body 18a facing the drill tip 26a, in particular due to the design of the rake surface 106a.

[0107] The drill tip 26a comprises a thread 48a with a defined thread length. Except for the thread 48a and with a maximum volume deviation of 10%, the drill tip 26a is materially symmetrical about the axis of rotation 16a. The drill tip 26a forms an end of the drill unit 34a facing away from the drill shank 30a. The drill tip 26a has a thread 48a with a defined thread length of at least 12 mm, in particular with a maximum tolerance of 1 mm. The drill tip 26a comprises a thread 48a with a defined thread length of at least 20 mm, in particular with a maximum tolerance of 1 mm. The drill tip 26a has a defined maximum diameter 90a. The drill tip 26a has a defined maximum diameter 90a of at least 6 mm, in particular with a maximum tolerance of 0.1 mm. The drill tip 26a has a defined maximum diameter 90a of a maximum of 8 mm, in particular up to a tolerance of a maximum of 0.1 mm.A ratio of the thread length of the drill bit 26a to the maximum diameter 90a of the drill bit 26a is greater than 2.1, in particular rounded to two decimal places. A ratio of the thread length of the drill bit 26a to the maximum diameter 90a of the drill bit 26a is less than 2.35, in particular rounded to two decimal places. A minimum ratio of the maximum diameter 90a of the drill bit 26a to the diameter 88a of the shank body 52a is greater than 0.50, in particular greater than 0.60, in particular greater than 0.66, in particular rounded to two decimal places.

[0108] The smallest length ratio of a maximum length of the drill bit 26a along the axis of rotation 16a to a maximum length of the wood drilling device 10a, in particular the drilling unit 34a, along the axis of rotation 16a is at least 0.075. The wood drilling device 10a, in particular the drilling unit 34a, has a defined maximum length of at most 156 mm along the axis of rotation 16a, in particular with a tolerance of 3 mm. The smallest length ratio of a maximum length of the drill bit 26a along the axis of rotation 16a to a maximum length of the wood drilling device 10a, in particular the drilling unit 34a, along the axis of rotation 16a is at most 0.117, in particular rounded to three decimal places.

[0109] The drill bit 26a has a thread pitch of maximum 1.6 mm. The drill bit 26a has a length of at least 12 mm. The drill bit 26a has a length of maximum 20 mm. The drill bit 26a has a thread depth of at least 1.0 mm or 1.1 mm. The drill bit 26a has a thread angle of at least 40°. The drill bit 26a, in particular the thread 48a of the drill bit 26a, has a thread angle of 50°.

[0110] The ratio of the thread pitch of the drill tip 26a to the thread depth of the drill tip 26a is a maximum of 1.25, especially rounded to two decimal places.

[0111] The minimum length ratio of the maximum length of the drill tip 26a along the axis of rotation 16a to the maximum length of the cutting body 18a along the axis of rotation 16a is at least 0.25, and in particular more than 0.5. In particular, the cutting body 18a has a short but solid body, especially compared to the drill tip 26a. The cutting body 18a has a maximum length of at least 25 mm along the axis of rotation 16a, in particular with a tolerance of no more than 2 mm. The cutting body 18a has a maximum length of no more than 35 mm along the axis of rotation 16a, in particular with a tolerance of no more than 2 mm. The drill tip 26a has a drill tip angle 182a of 17°, with a tolerance of no more than 3°.

[0112] The smallest length ratio of the maximum length of the drill tip 26a along the axis of rotation 16a to the maximum length of the cutting body 18a along the axis of rotation 16a is at least 0.3. The smallest length ratio of the maximum length of the drill tip 26a along the axis of rotation 16a to the maximum length of the cutting body 18a along the axis of rotation 16a is at most 0.8.

[0113] The first wood drilling device 10a has a maximum thickness 176a of 16 mm, in particular with a tolerance of maximum 0.5 mm. The second wood drilling device 12a has a defined maximum thickness 176a of 7.7 mm or 13 mm, in particular with a tolerance of maximum 0.5 mm.

[0114] The shank body 52a of the first wood drilling device 10a has a uniform diameter 88a of 8.7 mm with a tolerance of 0.4 mm. The shank body 52a of the second wood drilling device 12a has a uniform diameter 88a of 7.3 mm with a tolerance of 0.4 mm.

[0115] Figure 7 The first wood drilling device 10a is shown in a top view along the axis of rotation 16a towards the drill tip 26a. Figure 7This shows that the maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a is an extent of the cutting body 18a from one of the radial outer edges 210a to the other radial outer edge 210a. An extent 206a of the cutting body 18a perpendicular to the axis of rotation 16a from one of the radial edges 140a to the other radial edge 140a is shorter, in particular at least 5% of the maximum extent 192a of the cutting body 18a, than the maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a. An extension 208a of the cutting body 18a perpendicular to the axis of rotation 16a from an outer edge different from the radial edges 140a and from the radial outer edges 210a, in particular a second radial outer edge 212a, to another second radial outer edge 212a is shorter, in particular at least 10% of the maximum extension 192a of the cutting body 18a, than the maximum extension 192a of the cutting body 18a perpendicular to the axis of rotation 16a.The maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a is aligned at an angle 214a of at least 2° to a largest outer surface of the cuboid 114a, in particular when viewed along the axis of rotation 16a (cf. . Fig. 7 ). The radial outer edges 210a and the second radial outer edges 212a have an angle of 4° to the axis of rotation 16a, in particular with a tolerance of 2°.

[0116] Figure 8This shows that a chamfer on the rake face 106a extends into the first two turns of the thread 48a of the drill tip 26a from the rake face 106a. The first two turns of the thread 48a of the drill tip 26a each have a chip recess 216a, 216'a, which corresponds in particular to the chamfer on the rake face 106a, through which the drill tip 26a partially has a concave outer contour in a section perpendicular to the axis of rotation 16a. The first turn of the thread 48a of the drill tip 26a has a chip conveying recess 218a, which corresponds in particular to the chamfer on the chip conveying surface 108a, through which the drill tip 26a partially has a concave outer contour in a section perpendicular to the axis of rotation 16a.

[0117] Figure 9shows an overview of cutting planes AA, BB, CC, DD, EE, FF through the cutting body 18a perpendicular to the axis of rotation 16a, via a cutting plane XX through the drilling unit 34a parallel to the axis of rotation 16a and via a cutting plane YY through the cutting body 18a parallel to the axis of rotation 16a.

[0118] Figure 10 shows the cutting body 18a in a sectional view along the AA cutting plane.

[0119] In particular, the chip removal surface 108a is shown in the cross-section along the AA cutting plane. As an aid to orientation, the maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a is shown, which is not located in the cross-section along the AA cutting plane.

[0120] For a chip conveying surface 108a of the cutting body 18a, surface normals 220a are shown. For clarity, only the two outermost surface normals 220a are shown with a reference symbol. In a convex sub-surface 222a of the chip conveying surface 108a, adjacent surface normals 220a of the chip conveying surface 108a are aligned away from the cutting body 18a without any points of intersection. In the convex sub-surface 222a of the chip conveying surface 108a, all surface normals 220a are directed at a fanning angle, in particular a solid angle, away from the cutting body 18a.

[0121] In a concave partial surface 224a of the chip conveying surface 108a, adjacent surface normals 220a of the chip conveying surface 108a intersect, which are directed in particular away from the cutting body 18a.

[0122] The convex sub-surface 222a is defined in a polar coordinate system, which is formed by the maximum extent 192a of the cutting body 18a and an axis which is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, by points on the chip conveying surface 108a which have an angle 226a to the maximum extent 192a of the cutting body 18a of 35° to 112°, in the cross-section along the cutting plane AA. In the Figures 11 to 15 Three polar coordinates 230a are shown as examples.

[0123] The concave sub-surface 224a is formed in the polar coordinate system, which is formed in particular by the maximum extent 192a of the cutting body 18a and an axis which is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, by points of the chip conveying surface 108a which have an angle 226a to the maximum extent 192a of the cutting body 18a of 8° to 35°, in the cross-section along the cutting plane AA.

[0124] The chip conveying surface 108a has an inflection point 228a in the cross-section along the cutting plane AA, at which the convex sub-surface 222a transitions into the concave sub-surface 224a. At the inflection point 228a, the surface normal 220a is part of both the concave sub-surface 222a and the convex sub-surface 224a. In the polar coordinate system, which is formed in particular by the maximum extent 192a of the cutting body 18a and an axis that is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, the inflection point 228a is formed by a point on the chip conveying surface 108a that forms an angle 226a of 35° with the maximum extent 192a of the cutting body 18a.

[0125] The chip conveying surface 108a has a low point 172a in the cross-section along the cutting plane AA, which is located furthest away from an imaginary connecting line 170a of the, in particular radial, endpoints of the chip conveying surface 108a (cf. Fig. 2 and Fig. 10 ).

[0126] Figure 11 shows the cutting body 18a in a sectional view along the BB cutting plane.

[0127] In particular, the chip conveying surface 108a is shown in the cross-section along the BB cutting plane. As an aid to orientation, the maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a is shown, which is not located in this cross-section along the BB cutting plane.

[0128] For a chip conveying surface 108a of the cutting body 18a, surface normals 220a are shown. For clarity, only the two outermost surface normals 220a are shown with a reference symbol. In a convex sub-surface 222a of the chip conveying surface 108a, adjacent surface normals 220a of the chip conveying surface 108a are aligned away from the cutting body 18a without any points of intersection. In the convex sub-surface 222a of the chip conveying surface 108a, all surface normals 220a are directed at a fanning angle, in particular a solid angle, away from the cutting body 18a.

[0129] In a concave partial surface 224a of the chip conveying surface 108a, adjacent surface normals 220a of the chip conveying surface 108a intersect, which are directed in particular away from the cutting body 18a.

[0130] The convex sub-surface 222a is formed in a polar coordinate system, which is formed by the maximum extent 192a of the cutting body 18a and an axis which is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, by points of the chip conveying surface 108a which have an angle 226a to the maximum extent 192a of the cutting body 18a of 50° to 125°, in the cross-section along the cutting plane BB.

[0131] The concave sub-surface 224a is formed in the polar coordinate system, which is formed in particular by the maximum extent 192a of the cutting body 18a and an axis which is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, by points of the chip conveying surface 108a which have an angle 226a to the maximum extent 192a of the cutting body 18a of 50° to -10°, in the cross-section along the cutting plane BB.

[0132] The chip conveying surface 108a has an inflection point 228a in the cross-section along the cutting plane BB, at which the convex sub-surface 222a transitions into the concave sub-surface 224a. At the inflection point 228a, the surface normal 220a is part of both the concave sub-surface 222a and the convex sub-surface 224a. In the polar coordinate system, which is formed in particular by the maximum extent 192a of the cutting body 18a and an axis that is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, the inflection point 228a is formed by a point on the chip conveying surface 108a that forms an angle 226a of 50° with the maximum extent 192a of the cutting body 18a.

[0133] The chip conveying surface 108a has a low point 172a in the cross-section along the section plane BB, which is located furthest away from an imaginary connecting line 170a of the, in particular radial, endpoints of the chip conveying surface 108a (cf. Fig. 2 and Fig. 11 ).

[0134] Figure 12 shows the cutting body 18a in a sectional view along the CC cutting plane.

[0135] In particular, the chip removal surface 108a is shown in the cross-section along the CC cutting plane. As an aid to orientation, the maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a is shown, which is not located in this cross-section along the CC cutting plane.

[0136] For a chip conveying surface 108a of the cutting body 18a, surface normals 220a are shown. For clarity, only the two outermost surface normals 220a are shown with a reference symbol. In a convex sub-surface 222a of the chip conveying surface 108a, adjacent surface normals 220a of the chip conveying surface 108a are aligned away from the cutting body 18a without any points of intersection. In the convex sub-surface 222a of the chip conveying surface 108a, all surface normals 220a are directed at a fanning angle, in particular a solid angle, away from the cutting body 18a.

[0137] In a concave partial surface 224a of the chip conveying surface 108a, adjacent surface normals 220a of the chip conveying surface 108a intersect, which are directed in particular away from the cutting body 18a.

[0138] The convex sub-surface 222a is formed in a polar coordinate system, which is formed by the maximum extent 192a of the cutting body 18a and an axis which is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, by points of the chip conveying surface 108a which have an angle 226a to the maximum extent 192a of the cutting body 18a of 30° to 111°, in the cross-section along the cutting plane CC.

[0139] The concave sub-surface 224a is formed in the polar coordinate system, which is formed in particular by the maximum extent 192a of the cutting body 18a and an axis which is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, by points of the chip conveying surface 108a which have an angle between 226a to the maximum extent 192a of the cutting body 18a of 30° to - 17°, in the cross-section along the cutting plane CC.

[0140] The chip conveying surface 108a has an inflection point 228a in the cross-section along the cutting plane CC, at which the convex sub-surface 222a transitions into the concave sub-surface 224a. At the inflection point 228a, the surface normal 220a is part of both the concave sub-surface 222a and the convex sub-surface 224a. In the polar coordinate system, which is formed in particular by the maximum extent 192a of the cutting body 18a and an axis that is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, the inflection point 228a is formed by a point on the chip conveying surface 108a that forms an angle 226a of 30° with the maximum extent 192a of the cutting body 18a.

[0141] The chip conveying surface 108a has a low point 172a in the cross-section along the section plane CC, which is located furthest away from an imaginary connecting line 170a of the, in particular radial, endpoints of the chip conveying surface 108a (cf. Fig. 2 and Fig. 12 ).

[0142] Figure 13 shows the cutting body 18a in a sectional view along the DD cutting plane.

[0143] In particular, the chip removal surface 108a is shown in the cross-section along the DD cutting plane. As an aid to orientation, the maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a is shown, which is not located in the cross-section along the DD cutting plane.

[0144] For a chip conveying surface 108a of the cutting body 18a, surface normals 220a are shown. For clarity, only the two outermost surface normals 220a are shown with a reference symbol. In a convex sub-surface 222a of the chip conveying surface 108a, adjacent surface normals 220a of the chip conveying surface 108a are aligned away from the cutting body 18a without any points of intersection. In the convex sub-surface 222a of the chip conveying surface 108a, all surface normals 220a are directed at a fanning angle, in particular a solid angle, away from the cutting body 18a.

[0145] In a concave partial surface 224a of the chip conveying surface 108a, adjacent surface normals 220a of the chip conveying surface 108a intersect, which are directed in particular away from the cutting body 18a.

[0146] The convex sub-surface 222a is formed in a polar coordinate system, which is formed by the maximum extent 192a of the cutting body 18a and an axis which is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, by points of the chip conveying surface 108a which have an angle 226a to the maximum extent 192a of the cutting body 18a of 15° to 103°, in the cross-section along the cutting plane DD.

[0147] The concave sub-surface 224a is formed in the polar coordinate system, which is formed in particular by the maximum extent 192a of the cutting body 18a and an axis which is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, by points of the chip conveying surface 108a which have an angle 226a to the maximum extent 192a of the cutting body 18a of 15° to -19°, in the cross-section along the cutting plane DD.

[0148] The chip conveying surface 108a has an inflection point 228a in the cross-section along the cutting plane DD, at which the convex sub-surface 222a transitions into the concave sub-surface 224a. At the inflection point 228a, the surface normal 220a is part of both the concave sub-surface 222a and the convex sub-surface 224a. In the polar coordinate system, which is formed in particular by the maximum extent 192a of the cutting body 18a and an axis that is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, the inflection point 228a is formed by a point on the chip conveying surface 108a that forms an angle 226a of 15° with the maximum extent 192a of the cutting body 18a.

[0149] The chip conveying surface 108a has a low point 172a in the cross-section along the cutting plane DD, which is located furthest away from an imaginary connecting line 170a of the, in particular radial, endpoints of the chip conveying surface 108a (cf. Fig. 2 and Fig. 13 ).

[0150] Figure 14 shows the cutting body 18a in a sectional view along the EE cutting plane.

[0151] In particular, the chip removal surface 108a is shown in the cross-section along the EE cutting plane. As an aid to orientation, the maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a is shown, which is not located in the cross-section along the EE cutting plane.

[0152] For a chip conveying surface 108a of the cutting body 18a, surface normals 220a are shown. For clarity, only the two outermost surface normals 220a are shown with a reference symbol. In a convex sub-surface 222a of the chip conveying surface 108a, adjacent surface normals 220a of the chip conveying surface 108a are aligned away from the cutting body 18a without any points of intersection. In the convex sub-surface 222a of the chip conveying surface 108a, all surface normals 220a are directed at a fanning angle, in particular a solid angle, away from the cutting body 18a.

[0153] In a concave partial surface 224a of the chip conveying surface 108a, adjacent surface normals 220a of the chip conveying surface 108a intersect, which are directed in particular away from the cutting body 18a.

[0154] The convex sub-surface 222a is formed in a polar coordinate system, which is formed by the maximum extent 192a of the cutting body 18a and an axis which is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, by points of the chip conveying surface 108a which have an angle 226a to the maximum extent 192a of the cutting body 18a of 1° to 87°, in the cross-section along the cutting plane EE.

[0155] The concave sub-surface 224a is formed in the polar coordinate system, which is formed in particular by the maximum extent 192a of the cutting body 18a and an axis which is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, by points of the chip conveying surface 108a which have an angle 226a to the maximum extent 192a of the cutting body 18a of 1° to -14°, in the cross-section along the cutting plane EE.

[0156] The chip conveying surface 108a has an inflection point 228a in the cross-section along the cutting plane EE, at which the convex sub-surface 222a transitions into the concave sub-surface 224a. At the inflection point 228a, the surface normal 220a is part of both the concave sub-surface 222a and the convex sub-surface 224a. In the polar coordinate system, which is formed in particular by the maximum extent 192a of the cutting body 18a and an axis that is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, the inflection point 228a is formed by a point on the chip conveying surface 108a that has an angle 226a of 1° to the maximum extent 192a of the cutting body 18a.

[0157] The chip conveying surface 108a has a low point 172a in the cross-section along the cutting plane EE, which is located furthest away from an imaginary connecting line 170a of the, in particular radial, endpoints of the chip conveying surface 108a (cf. Fig. 2 and Fig. 14 ).

[0158] Figure 15 shows the cutting body 18a in a sectional view along the FF cutting plane.

[0159] In particular, the chip conveying surface 108a is shown in the cross-section along the FF cutting plane. As an aid to orientation, the maximum extent 192a of the cutting body 18a perpendicular to the axis of rotation 16a is shown, which is not located in this cross-section along the FF cutting plane.

[0160] For a chip-conveying surface 108a of the cutting body 18a, surface normals 220a are shown. For clarity, only the two outermost surface normals 220a are shown with a reference symbol. In a convex sub-surface 222a of the chip-conveying surface 108a, adjacent surface normals 220a of the chip-conveying surface 108a are aligned away from the cutting body 18a without any points of intersection. In the convex sub-surface 222a of the chip-conveying surface 108a, all surface normals 220a are directed at a fanning angle, in particular a solid angle, away from the cutting body 18a. The chip-conveying surface 108a is completely formed by the convex sub-surface 222a in the cross-section along the cutting plane FF.

[0161] The convex sub-surface 222a is formed in a polar coordinate system, which is formed by the maximum extent 192a of the cutting body 18a and an axis which is perpendicular to the maximum extent 192a of the cutting body 18a and perpendicular to the axis of rotation 16a, by points of the chip conveying surface 108a which have an angle 226a to the maximum extent 192a of the cutting body 18a of -5° to 72°, in the cross-section along the cutting plane FF.

[0162] In Figure 9 are the low points 172a of the chip conveying surface 108a from each of the cross-sections of the Figures 10 to 14 schematically marked and connected with an imaginary low point line 232a.

[0163] The low point line 232a has a curved profile when viewed along the axis of rotation 16a. The low points 172a of the chip conveying surface 108a are located at one end of the cutting body 18a facing the drill tip 26a, closer to an edge radially removed from the axis of rotation 16a, in particular the boundary edge 150a or the radial outer edge 210a, of the chip conveying surface 108a than in the central region of the maximum extent 152a of the cutting body 18a along the axis of rotation 16a, in particular in the central 50% of the cutting body 18a measured by volume along the axis of rotation 16a, wherein the proximity is measured in particular as a percentage with respect to the total extent of the chip conveying surface 108a perpendicular to the axis of rotation 16a.

[0164] The low points 172a of the chip conveying surface 108a are located at an end of the cutting body 18a facing the drill shank 30a closer to an edge radially removed from the axis of rotation 16a, in particular the boundary edge 150a or the radial outer edge 210a, of the chip conveying surface 108a than in the middle region of the maximum extent 152a of the cutting body 18a along the axis of rotation 16a, in particular in the middle 50% of the cutting body 18a measured by volume along the axis of rotation 16a, wherein the proximity is measured in particular as a percentage with respect to the total extent of the chip conveying surface 108a perpendicular to the axis of rotation 16a.

[0165] In Figure 9 are the inflection points 228a of the chip conveying surface 108a from each of the cross-sections of the Figures 10 to 14 schematically marked and connected with an imaginary turning point line 234a, which extends along the axis of rotation 16a over the chip conveying surface 108a.

[0166] The inflection point line 234a has a curved profile when viewed along the axis of rotation 16a. The inflection points 228a of the chip conveying surface 108a are located at one end of the cutting body 18a facing the drill tip 26a, closer to an edge radially removed from the axis of rotation 16a, in particular the boundary edge 150a or the radial outer edge 210a, of the chip conveying surface 108a than in the central region of the maximum extent 152a of the cutting body 18a along the axis of rotation 16a, in particular in the central 50% of the cutting body 18a measured by volume along the axis of rotation 16a, wherein the proximity is measured in particular as a percentage with respect to the total extent of the chip conveying surface 108a perpendicular to the axis of rotation 16a.

[0167] The turning points 228a of the chip conveying surface 108a are located at an end of the cutting body 18a facing the drill shank 30a closer to an edge radially removed from the axis of rotation 16a, in particular the boundary edge 150a or the radial outer edge 210a, of the chip conveying surface 108a than in the middle region of the maximum extent 152a of the cutting body 18a along the axis of rotation 16a, in particular in the middle 50% of the cutting body 18a measured by volume along the axis of rotation 16a, wherein the proximity is measured in particular as a percentage with respect to the total extent of the chip conveying surface 108a perpendicular to the axis of rotation 16a.

[0168] Figure 16 shows the cutting body 18a in a sectional view along the XX cutting plane (cf. Figure 9 ).

[0169] In particular, the cutting body 18a is shown in cross-section along the XX cutting plane. The axis of rotation 16a is shown for orientation. Figure 16shown. Additionally, the cutting body 18a is marked with two imaginary boundary lines 236a.

[0170] The maximum thickness 176a of the cutting body 18a is arranged at a distance from the center of the cutting body 18a along the axis of rotation 16a. The maximum thickness 176a of the cutting body 18a is located in one half of the cutting body 18a facing the drill shank 30a, in particular measured by distance along the axis of rotation 16a. The maximum thickness 176a of the cutting body 18a is located in one third of the cutting body 18a facing the drill shank 30a, in particular measured by distance along the axis of rotation 16a.

[0171] Figure 17 shows the cutting body 18a in a sectional view along the YY cutting plane (cf. Figure 9 ).

[0172] In particular, the cutting body 18a is shown in cross-section along the YY cutting plane. The axis of rotation 16a is shown for orientation. Figure 16 depicted.

[0173] The cutting body 18a, in particular the cutting wings 66a, 68a, has a shaft side edge 238a on a side facing the drill shaft 30a, which adjoins the radial outer surfaces 142a, 144a.

[0174] Figure 18 Figure 1 schematically shows a method for manufacturing the wood drilling devices 10a, 12a.

[0175] In a process step, in particular a forging step 184a, the drilling unit 34a, 36a, in particular the drill shaft 30a, 32a, the cutting body 18a, 24a and the drill tip 26a, 28a, is forged from a drill head blank, wherein a maximum diameter 14a, 20a of the cutting body 18a, in particular measured perpendicular to a longitudinal axis of the drill shaft 30a, 32a, is at least one and a half times as large as an original diameter of the drill head blank, in particular measured perpendicular to a longitudinal axis of the drill head blank, in particular before the forging process.

[0176] Preferably, in a process step, in particular the forging step 184a, the drilling unit 34a, 36a with a maximum extent 192a perpendicular to the axis of rotation 16a is forged from the drill head blank, wherein the original diameter of the drill head blank, in particular measured perpendicular to a longitudinal axis of the drill head blank, in particular before the forging process, is at most two-thirds as large as the maximum extent 192a of the drilling unit 34a, 36a perpendicular to the axis of rotation 16a and / or to the longitudinal axis of the drilling unit 34a, 36a.

[0177] Preferably, in a process step, in particular a grinding step 186a, the radial outer surfaces 142a, 144a are ground to the cutting body 18a.

[0178] In the Figures 19 and 20A further embodiment of the invention is shown. The following descriptions and drawings are essentially limited to the differences between the embodiments, whereby with regard to identically designated components, in particular components with the same reference numerals, reference is also generally made to the drawings and / or the description of the other embodiments, in particular the Figures 1 to 18 , can be referenced. To distinguish the embodiments, the letter a is the reference numeral of the embodiment in the Figures 1 to 18 recreated. In the exemplary embodiments of the Figures 19 and 20 The letter a is replaced by the letter b.

[0179] Figure 19Figure 1 shows a base side 70b of the cutting body 18b. The cutting surfaces 116b, 118b are spaced at least 120% apart from the axis of rotation 16b by the maximum thickness, in particular diameter 90b, of a drill tip 26b, measured in particular perpendicular to the axis of rotation 16b. The cutting surfaces 116b, 118b are spaced apart from the drill tip 26b.

[0180] The cutting surfaces 122b and 126b, facing the drill tip 26b, each border a tip surface 240b in the direction of the axis of rotation 16b. These tip surfaces are aligned parallel to the axis of rotation 16b, with deviations of up to 10°. Spacer surfaces 242b are arranged between the drill tip 26b and the cutting surfaces 122b and 126b. These spacer surfaces are aligned parallel to the cutting surfaces 122b and 126b, with deviations of up to 20°. The spacer surfaces 242b are offset from the cutting surfaces 116b and 118b along the axis of rotation 16b.

[0181] Figure 20Figure 1 shows the cutting body 18b. The cutting body 18b, in particular two cutting wings 66b, 68b, has in this example a rounded drill shaft side 244b which is arranged facing a drill shaft 30b.

Claims

1. Wood drilling device for drilling, in particular impact drilling, a wood material, in particular containing metal fragments, with at least one drill shank (30a, 32a; 30b, 32b) which is provided for clamping on a machine tool (202a; 202b), with at least one drill tip (26a, 28a; 26b, 28b) which preferably has a thread (48a, 50a; 48b, 50b), and with at least one cutting body (18a, 24a; 18b, 24b) for cutting the wood material, wherein the cutting body (18a, 24a; 18b, 24b) has at least one, preferably at least two, in particular relative to each other with respect to an axis of rotation (16a, 22a; 16b, 22b) of the cutting body (18a, 24a; 18b, 24b), preferably symmetrically arranged, cutting wings (66a, 68a; 66b, 68b), wherein in particular at least one of the cutting wings (66a, 68a; 66b, 68b) has a cutting surface (116a, 118a; 116b, 118b) which is located on one of the drill tip (26a, 28a;26b, 28b) facing the base side (70a, 70b), which is defined in particular with respect to an imaginary cylinder (72a; 72b) about the axis of rotation (16a, 22a; 16b, 22b), is arranged, ; characterized by the fact that the cutting body (18a) has a chip surface 106a on at least one outer surface (110a, 112a) for chipping away the wood material and / or the metal fragments, wherein the chip surface (106a) is formed in particular by a transition area (164a) and / or the cutting surface (116a, 118a; 116b, 118b) is formed by at least two adjacent cutting surfaces (122a, 124a, 126a, 128a; 122b, 124b, 126b, 128b) angled from a drilling plane (74a) oriented perpendicular to the axis of rotation (16a, 22a; 16b, 22b) in the direction of the drill shank (30a, 32a; 30b, 32b), which are angled to each other at an angle (130a; 130b) are angled and each has an angle other than 0° to the axis of rotation (16a, 22a; 16b, 22b).

2. Wood drilling device according to claim 1, characterized by the fact that which at least two cutting surfaces (122a, 124a, 126a, 128a; 122b, 124b, 126b, 128b) are designed as flat surfaces.

3. Wood drilling device according to claim 1 or 2, characterized by the fact that a cutting surface (122a, 126a; 122b, 126b) facing the drill tip (26a, 28a; 26b, 28b) of which at least two cutting surfaces (122a, 124a, 126a, 128a; 122b, 124b, 126b, 128b) have an angle (132a; 132b) of 5° to the drilling plane (74a; 74b) except for deviations of a maximum of 2°.

4. Wood drilling device according to one of the preceding claims, characterized by the fact that a cutting surface (124a, 128a; 124b, 128b) arranged away from the drill tip (26a, 28a; 26b, 28b) of which at least two cutting surfaces (122a, 124a, 126a, 128a; 122b, 124b, 126b, 128b) have an angle (134a; 134b) of 45° to the drilling plane (74a; 74b) except for deviations of a maximum of 5°.

5. Wood drilling device according to one of the preceding claims, characterized by the fact that a cutting surface (122a, 126a) facing the drill tip (26a, 28a; 26b, 28b) of which at least two cutting surfaces (122a, 124a, 126a, 128a) have a maximum extent (136a) perpendicular to the axis of rotation (16a, 22a; 16a, 22b), which extends at most twice as far as a maximum extent (138a) perpendicular to the axis of rotation (16a, 22a; 16b, 22b) of which at least two cutting surfaces (122a, 124a, 126a, 128a; 122b, 122b, 122a, 124a, 126a, 128a; 122b, 126a, 128a, 126b, 128a, 126a ...6a, 128a, 126a, 128a, 126a, 126a, 128a, 126a, 128a, 126a, 126a, 128a, 126a, 126a, 128a, 126a, 124b, 126b, 128b).

6. Wood drilling device according to one of the preceding claims, characterized by the fact thata cutting surface (122a, 126a; 122b, 126b) facing the drill tip (26a, 28a; 26b, 28b) of at least two cutting surfaces (122a, 124a, 126a, 128a; 122b, 124b, 126b, 128b) has a maximum extent (136a; 136b) perpendicular to the axis of rotation (16a, 22a; 16b, 22b) which extends at least as far as a maximum extent (138a; 138b) perpendicular to the axis of rotation (16a, 22a; 16b, 22b) of a cutting surface (124a, 128a; 28b) facing away from the drill tip (26a, 28a; 26b, 28b). 124b, 128b) of at least two cutting surfaces (122a, 124a, 126a, 128a; 122b, 124b, 126b, 128b).

7. Wood drilling device according to one of the preceding claims, characterized by the fact thatat least one of the cutting wings (66a, 68a; 66b, 68b) has at least two radial outer surfaces (142a, 144a; 142b, 144b) angled relative to each other via a radial edge (140a; 140b) which extends parallel to the axis of rotation (16a, 22a; 16b, 22b) with deviations of a maximum of 15°, which are arranged at one of the free ends of the respective cutting wings (66a, 68a; 66b, 68b) that are radially away from the axis of rotation (16a, 22a; 16b, 22b) and are located at the maximum distance from the axis of rotation (16a, 22a; 16b, 22b).

8. Wood drilling device according to one of the preceding claims, characterized by the fact thatThe cutting body (18a, 24a; 18b, 24b) has on at least one outer surface (110a, 112a; 110b, 112b), which is defined in particular with respect to an imaginary cylinder (72a; 72b) about the axis of rotation (16a, 22a; 16b, 22b), a chip surface (106a; 106b) for chipping the wood material and / or the metal fragments and a chip conveying surface (108a; 108b) which adjoins the chip surface (106a; 106b) and which is partially concave and partially convex curved.

9. Wood drilling device according to one of the preceding claims, characterized by the fact that a ratio of thread length of drill tip (26a, 28a; 26b; 28b) to maximum diameter (90a; 90b) of drill tip (26a, 28a; 26b; 28b) is greater than 2.

0.

10. Wood drilling device according to one of the preceding claims, characterized by the fact thatThe drill shank (30a, 32a; 30b, 32b), the drill tip (26a, 28a; 26b, 28b) and the cutting body (18a, 24a; 18b, 24b) form a drilling unit (34a, 36a; 34b, 36b) which is made of a material composition, wherein the drilling unit (34a, 36a; 34b, 36b) has at least two distinguishable hardness ranges (38a, 40a, 42a, 44a, 46a; 38b, 40b, 42b, 44b, 46b), in particular measured according to Rockwell, wherein the drill shank (30a, 32a; 30b, 32b) in particular has a shank body (52a; 52b) with a uniform diameter (88a; 88b) and a tool connecting body (54a; 54b) which are directly connected to each other, wherein the shank body (52a; 52b) in particular has a hardening limit (98a; 98b) which divides the shank body (52a; 52b) into two hardening areas (38a, 40a, 42a, 44a, 46a; 38b, 40b, 42b, 44b, 46b) with different hardnesses, wherein the hardening limit (98a; 98b) is in particular spaced apart from the tool connecting body (54a; 54b).

11. Wood drilling system comprising an electric machine tool (202a; 202b) and comprising at least one wood drilling device (10a, 12a; 10b, 12b) according to one of the preceding claims.

12. Method for manufacturing a wood drilling device (10a, 12a; 10b, 12b) according to any one of claims 1 to 10.

13. Method according to claim 12, characterized by the fact that in at least one process step the drilling unit (34a, 36a; 34b, 36b) is forged from a drill head blank, wherein a maximum diameter (14a, 20a; 14b, 20b) of the cutting body (18a, 24a; 18b, 24b), in particular measured perpendicular to a longitudinal axis of the drill shank (30a, 32a; 30b, 32b), is at least one and a half times as large as an original diameter of the drill head blank, in particular measured perpendicular to a longitudinal axis of the drill head blank, in particular before the forging process.

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