Abstract: A rotary tool, in particular drilling tool, extends along a longitudinal axis and has an end surface; a brad point; and at least one major cutting edge extending outward up to an edge corner. A first free surface segment adjoins the major cutting edge, and a second free surface segment in turn adjoins said first free surface segment. To keep the stress, in particular the wear, low in the region of the end surface, the first free surface segment has a lower average abrasiveness than the second free surface segment.

Abstract: The rotary tool (2) is in particular designed as a modular drill and extends in an axial direction (4) along an axis of rotation (6). It comprises two coupling parts, namely a carrier (10) and a cutting head (12) that is attached to the carrier (10) so as to be exchangeable. A pin receiving means (20) is provided on the carrier (10), into which pin receiving means a coupling pin (40) of the cutting head (12) is introduced in a clamping manner and so as to be reversibly exchangeable. The pin receiving means (20) and the coupling pin (40) have torque sections (30a,b) and clamping sections (32a,b) that correspond to one another. In order to permit simple production, these clamping and torque sections are oriented parallel to the axis of rotation (6). In addition, in order to prevent pulling-out in an axial direction, stop surfaces (38a,b) are provided on the pin receiving means (20) and on the coupling pin (40), said stop surfaces being effective in an axial direction (4) and corresponding to one another.

Abstract: The rotary tool comprises a support and a cutting head which can be inserted into a pin receptacle of the support via a coupling pin. The support and the cutting head have mutually corresponding surface sections for transferring a radial clamping force and have mutually corresponding torque sections for transferring torque. For an axial pull-out stop device, effective stop surfaces are formed on the pin receptacle and on the coupling pin in the axial direction, wherein, to do this, a stop element is formed, the radial extension of which is smaller than or equal to a radial extension (r2) of the surface sections of the coupling pin and wherein the stop surfaces and the surface section are offset relative to each other in the circumferential direction.

Abstract: A coupling part structured to engage with a complementary coupling part for interchangeably fastening a cutting head to a carrier of a rotary cutting tool. The coupling part includes a pair of coupling pins arranged opposite each other with respect to a central longitudinal axis and spaced apart from each other so as to form a receiving space structured to receive a central pin of the complementary coupling part. Each coupling pin includes a stop surface for transmitting a torque, a radially external outer surface, and a radially internal inner surface. At least one of the outer surface or inner surface is a clamping surface oriented in an obliquely inclined manner with respect to the central longitudinal axis for centering and clamping the coupling part.

Abstract: A rotary tool, in particular drilling tool, extends along a longitudinal axis and has an end surface; a brad point; and at least one major cutting edge extending outward up to an edge corner. A first free surface segment adjoins the major cutting edge, and a second free surface segment in turn adjoins said first free surface segment. To keep the stress, in particular the wear, low in the region of the end surface, the first free surface segment has a lower average abrasiveness than the second free surface segment.

Abstract: The rotary tool, in particular, the drill (2), extends along a longitudinal axis (4) and has a front surface (6), a center (12), at least two main cutting edges (8), each extending outward from the center (12) to a cutting edge (10), as well as coiled flutes (20). Between the main cutting edge (8) and the flute (20), a common ground surface (26) is also applied, which extends from the center (12) to a radial exterior area in the region of the main cutting edge (8) to form a point thinning (28). A rake angle (?) is defined by the ground surface (26). Here, the rake angle (?) changes without steps in the direction of the center (12) and, in particular, continuously. Expediently, the ground surface extends (26) continuously to the cutting edge (10). As a result, on the whole, an advantageous cutting force distribution is achieved over the radial length of the main cutting edge (8).

Abstract: A method for manufacturing a drill bit (1), wherein in a first step the chip flutes (12) are ground into a round rod, in a second step the round rod is ground down to its outer diameter (15, 16) with simultaneous grinding of the drill-bit back (13), and wherein in a third step the drill-bit front (4) is ground, and a drill bit (1) having at least one chip flute (12) and one secondary cutting edge and one drill-bit back (13) adjoining the secondary cutting edge, the drill-bit back (13) sloping downwards as the distance from the secondary cutting edge increases, in order to create a clearance that becomes continuously larger as the distance from the point of intersection (19) of the secondary cutting edge with the drill-bit back (13) increases.

Abstract: The cutting tool (1), especially drill or milling cutter, comprises a base (3) which extends in an axial direction (2) and has an outer shell (14) with at least one interior recess (18) that extends in the axial direction (2), a supporting structure (16) having at least one separating piece (26) which separates a plurality of recesses (18) from each other being formed in the supporting structure. The cutting tool (1) is particularly a solid hard-metal tool. The supporting structure (16) ensures an efficient use of material.

Abstract: A coupling point for a modular rotary which extends in an axial direction. The coupling point includes a first coupling part disposed on a tool head and a second coupling part disposed on a carrier. The coupling parts can be coupled to one another by bidirectional rotation with the formation of an interference fit which acts in the radial direction. Each coupling part includes two coupling faces which lie opposite one another and have contact regions in which the interference fit is formed. In the first coupling part, at least one of the coupling faces has at least two contact regions which are spaced apart from one another in the circumferential direction, and, to this end, at least one first clearance portion is formed between the contact regions, in which clearance portion the two coupling parts do not bear against one another in the coupled state.

Abstract: In order to ensure good guidance of a drilling tool at the start of a drilling operation and at the same time ensure a reliable evacuation of a center chip, in the drill bit, in a tool flank adjoining a respective main cutting edge, an additional point thinning is recessed in the region of a transverse cutting edge, which additional point thinning, extending in a principal direction from the tool flank, merges, with a convex course, into a chip flute. As a result of the convex design, an as far as possible homogeneous, edge-free transition into the chip flute is obtained. Since the point thinning is additionally made, the tool flank, even in the rear end facing away from the cutting edge, remains at a front axial position, so that a second land is effective for a reliable guidance of the bore already at an axially front position.

Abstract: There is now provided a twist drill and a method for producing a twist drill which method includes forming a flute of a twist drill. The drill has drill material and a tip portion with a cutting lip. The drill has a land structure and a flute to remove chip residue. The land structure has a flute wall and a cutting edge structure that is disposed longitudinally along the flute wall. The cutting edge structure has a first portion at the drill tip portion and a second portion disposed away from the drill tip portion. The flute wall extends further into the land structure at the second portion of the cutting edge structure than at the tip portion to provide a greater amount of drill material at the tip portion than at the second portion of the cutting edge structure.

Abstract: A rotary tool extends in the direction of an axis of rotation and includes a carrier having a coupling receptacle disposed at an end face, the carrier having a carrier cross section. The coupling receptacle is delimited in the entire region of the carrier cross section by an outer web having an end face forming a planar bearing area. The coupling receptacle is delimited by side walls which extend step-free from the bearing area to a bottom area and include a pair of opposing clamping segments extending in the circumferential direction and a pair of opposing torque segments arranged at an angle thereto. The tool also includes a cutting head exchangeably fastened to the carrier, the cutting head having a coupling pin disposed in the coupling receptacle. At least one of the pairs of segments is oriented inclined in relation to the axis of rotation.

Abstract: Drill with a straight chucking groove, with a convexly curved main cutting edge with, adjacent to the main cutting edge, a convexly designed region of groove base and with, adjacent to the convexly designed region of the groove base, a concavely designed groove base or a concavely curved main cutting edge with, adjacent to the main cutting edge, a concavely designed groove base with, adjacent to the concavely design region of the groove base, a convexly design region of the groove base.

Abstract: A coupling part structured to engage with a complementary coupling part for interchangeably fastening a cutting head to a carrier of a rotary cutting tool. The coupling part includes a pair of coupling pins arranged opposite each other with respect to a central longitudinal axis and spaced apart from each other so as to form a receiving space structured to receive a central pin of the complementary coupling part. Each coupling pin includes a stop surface for transmitting a torque, a radially external outer surface, and a radially internal inner surface. At least one of the outer surface or inner surface is a clamping surface oriented in an obliquely inclined manner with respect to the central longitudinal axis for centering and clamping the coupling part.

Abstract: A tool head includes a main body having a nominal diameter, a face end center formed on the main body, and at least two major cutting edges which each run radially outward from and adjoin the face end center. The face end center is formed by a cone of circular cross-sectional area, which cone extends from a cone apex through to a cone base.

Abstract: The coupling part, in particular cutting head for a drilling tool for the interchangeable fastening in a coupling receptacle, has a coupling pin which is enclosed by a head support surface, wherein the coupling pin has a plurality of types of functional surfaces, namely stop surfaces for transmitting a torque between the cutting head and the carrier, and clamping surfaces for centering and clamping the cutting head in the coupling receptacle. The coupling pin has an axially front pin region and an adjoining, axially rear pin region, and the clamping surfaces and the stop surfaces are arranged in different pin regions. This decoupling and distribution of the functional surfaces to the various pin regions permits simpler production of the coupling pin and an overall more robust configuration.

Abstract: A replaceable cutting insert includes a cutting insert body having a forward cutting face and an opposing rearward base, an inlet coolant channel formed in the cutting insert body, a first outlet coolant channel formed in the cutting insert body and in fluid communication with the inlet coolant channel and a second outlet coolant channel formed in the cutting insert body and in fluid communication with the inlet coolant channel. The inlet coolant channel includes a longitudinal axis that is not axially aligned with either a first longitudinal axis of the first outlet coolant channel or a second longitudinal axis of the second outlet coolant channel. A rotary cutting tool incorporating the replaceable cutting insert is also provided. A method of making a replaceable cutting insert is also provided.

Abstract: A coupling point for a modular rotary which extends in an axial direction. The coupling point includes a first coupling part disposed on a tool head and a second coupling part disposed on a carrier. The coupling parts can be coupled to one another by bidirectional rotation with the formation of an interference fit which acts in the radial direction. Each coupling part includes two coupling faces which lie opposite one another and have contact regions in which the interference fit is formed. In the first coupling part, at least one of the coupling faces has at least two contact regions which are spaced apart from one another in the circumferential direction, and, to this end, at least one first clearance portion is formed between the contact regions, in which clearance portion the two coupling parts do not bear against one another in the coupled state.

Abstract: A drill bit for drilling having at least two cutting edges, each with two cutting portions and a non-cutting portion between the two cutting portions. The abstract of the disclosure is submitted herewith as required by 37 C.F.R. §1.72(b). As stated in 37 C.F.R. §1.72(b): A brief abstract of the technical disclosure in the specification must commence on a separate sheet, preferably following the claims, under the heading “Abstract of the Disclosure.” The purpose of the abstract is to enable the Patent and Trademark Office and the public generally to determine quickly from a cursory inspection the nature and gist of the technical disclosure. The abstract shall not be used for interpreting the scope of the claims. Therefore, any statements made relating to the abstract are not intended to limit the claims in any manner and should not be interpreted as limiting the claims in any manner.