Multi-part, modular tool

Abstract

Multi-part, modular tool (10) rotatable about a longitudinal tool axis (A), comprising: - a processing head (12); - a first holding element (14) comprising a body (14c) elongated along the longitudinal axis (A) of the tool, in which a passage (14d) extends along the longitudinal axis (A) of the tool; - a second retaining element (16) which may or may extend at least partially into the passage (14d) of the first retaining element (14); wherein the machining head (12) can be connected to or is connected to the second holding element (16) in such a way that the machining head (12) is fixed to the first holding element (14) at least in the axial direction and / or in the radial direction (R), and wherein the passage (14d) of the first holding element (14) and the second holding element (16) are aligned in such a way that during a joining operation in which the machining head (12) is connected to the second holding element (16), the second holding element (16) is movable or is moved relative to the first holding element (14), and wherein the machining head (12) has a cavity (18) which is provided to receive a front end region (16a) of the second retaining element (16) and wherein the machining head (12) has an internal thread (20) arranged within the cavity (18) which can be screwed onto or is screwed onto an external thread (32) provided on the front end region (16a), and wherein the machining head (12) has a second interface surface (28) and wherein a front end region (14a) of the first retaining element (14) has a second interface surface (30), wherein the second interface surface (28) of the machining head (12) and the second interface surface (30) of the front end region (14a) interact in such a way that the machining head (12) is supported radially, in particular completely circumferentially, on the front end region (14a), and wherein the second interface surface (28) of the machining head (12) is an outer surface of the machining head (12) and is arranged in the passage (14d) of the first retaining element (14) and wherein the second interface surface (30) of the front end region (14a) is an inner wall surface of the passage (14d) and wherein the second interface surface (28) of the machining head (12) is arranged between the inner wall surface and the second retaining element (16).

Description

[0001] The present invention relates to a multi-part, modular tool that can be rotated about a longitudinal tool axis.

[0002] The publication WO 2014 / 118 264 A1 describes a tool arrangement with a screw-in tool and an associated tool holder. The screw-in tool has a cylindrical tool head and a tool shank with an external thread. The tool holder belonging to the screw-in tool contains a holder body that comprises a hollow cylindrical holder part designed as a threaded insert and a sleeve-shaped guide part detachably fastened to the holder part. The hollow cylindrical holder part contains a cylindrical section with two support regions spaced apart in the axial direction, which are designed as external thread sections. The sleeve-shaped guide part, provided with an internal thread, is screwed onto the cylindrical section and supported by these sections. The holder part has a receiving opening with the internal thread at one end and a hexagon socket at the other end.The guide part has two guide surfaces to ensure the screwing tool is held in the correct position.

[0003] Document WO 2017 / 020051 A1 discloses an interchangeable cutting head comprising a working area and a connecting portion formed integrally with the working area and having an external thread. A support surface is formed between the working area and the external thread for supporting a corresponding contact surface of a tool shank. The support surface is curved in a section through a plane containing the longitudinal axis of the cutting head.

[0004] The publication DE 10 2012 104 606 A1 describes a tool holder for a screw-in tool with a base body that contains a receiving area with at least one conical receiving surface for engaging a corresponding conical contact surface of the screw-in tool. To protect the thread and to clamp with high concentricity even with minimal manufacturing effort, an insert is arranged in the base body that is movable transversely to the longitudinal axis of the base body and secured against rotation relative to the base body. The insert has a counter thread for a thread on the screw-in tool.

[0005] It is an object of the invention to provide an advantageous multi-part, modular tool.

[0006] The object is achieved according to the invention by the features of claim 1 and thus by a multi-part, modular tool which can be rotated about a tool longitudinal axis, comprising: - a machining head; - a first holding element having a body elongated along the longitudinal axis of the tool, in which a passage extends along the longitudinal axis of the tool; - a second holding element which can or extends at least partially into the passage of the first holding element; wherein the machining head is connectable or connected to the second holding element in such a way that the machining head is firmly fixed to the first holding element at least in the axial direction and / or in the radial direction, and wherein the passage of the first holding element and the second holding element are coordinated with one another in such a way that during a connecting process in which the machining head is connected to the second holding element, the second holding element is movable or is moved relative to the first holding element.

[0007] Such a modular tool provides a tool shank that can be connected to interchangeable machining heads. The machining head is releasably connected to the second holding element and thus fixed to the first holding element. The second holding element is movable relative to the first holding element within the first holding element and is therefore mounted in a floating manner. This prevents transverse forces, which would negatively affect the concentricity of the tool, from being generated when the machining head is connected to the holding elements. Furthermore, an axial offset between the first holding element and the second holding element can be compensated.In addition, when the tool is clamped in a chuck, clamping forces only act on the external first holding element, which serves as the tool shank, but not on the internal second holding element, since the floating bearing decouples the second holding element from the radial and / or axial clamping forces.

[0008] In an advantageous embodiment of the invention, the first holding element has a front end region and a rear end region arranged opposite the front end region, and the second holding element has a front end region and a rear end region arranged opposite the front end region. Alternatively or additionally, the rear end region of the second holding element can be or be accommodated within the rear end region of the first holding element. Furthermore, alternatively or additionally, the front end region of the second holding element can extend into or through the front end region of the first holding element, in particular protrude beyond it in the axial direction.

[0009] In this embodiment, the machining head can be connected to the front end of the second holding element, so that the machining head is pulled into contact with the front end of the first holding element and secured thereto. Due to the floating bearing, the second holding element can be tilted at an angle to the tool's longitudinal axis, thus compensating for movements during the connection process.

[0010] A further advantageous embodiment of the invention comprises that the rear end region of the second holding element is substantially fixed relative to the rear end region of the first holding element during a connection process in which the machining head is connected to the second holding element, in particular in at least one axial direction. Alternatively or additionally, the front end region of the second holding element can be or can be moved relative to the front end region of the first holding element during a connection process in which the machining head is connected to the second holding element, in particular in the radial direction.

[0011] In this way, the machining head can be pulled into its correct working position relative to the tool's longitudinal axis during the connection process, whereby relatively wide tolerances can be compensated for by the mobility of the second holding element relative to the first holding element.

[0012] Furthermore, it may be advantageous that the rear end region of the second holding element is or can be secured within the rear end region of the first holding element, in particular by a fixing element, preferably an elastic fixing element, in particular such that the rear end region of the second holding element is arranged concentrically to the rear end region of the first holding element.

[0013] In this way, the second retaining element is secured against falling out of the first retaining element. Furthermore, an elastic fixing element, in particular, allows at least slight radial and / or axial movement of the rear end region of the second retaining element within the rear end region of the first retaining element, at least during the connection process.

[0014] Alternatively or additionally, it can be provided that the front end region of the second holding element extends in or through the front end region of the first holding element such that it can move during the connecting process in which the machining head is connected to the second holding element, in particular radially, relative to the front end region of the first holding element.

[0015] This allows the machining head to maintain its correct working position relative to the tool's longitudinal axis and to be pulled against the first retaining element during the connection process. In particular, relatively wide tolerances on the machining head, for example, those required by a sintered thread on the machining head, can be compensated for.

[0016] A further advantageous embodiment comprises that the front end region of the second holding element is arranged substantially concentrically to the front end region of the first holding element when the machining head is connected to the second holding element, in particular after the end of the connecting process, in such a way that the machining head is firmly fixed to the first holding element.

[0017] This allows for a high degree of concentricity of the tool to be achieved. It also ensures that the machining head rests securely against the first holding element.

[0018] Furthermore, it may be advantageous for the front end region of the second holding element to be spaced apart from the front end region of the first holding element, in particular such that a circumferential gap is provided between the front end region of the second holding element and the front end region of the first holding element.

[0019] Such a distance between the first and second holding elements prevents the transfer of clamping forces from the chuck or clamping tool to the internal second holding element. Furthermore, the generation of transverse forces is reduced or completely eliminated.

[0020] According to the invention, the machining head has a cavity which is provided to receive a front end region of the second holding element and the machining head has an internal thread arranged within the cavity which can be screwed or is screwed onto an external thread provided on the front end region.

[0021] The machining head can thus be easily screwed manually onto the second holding element and tightened with a conventional torque wrench. Thanks to this advantageous design, only a relatively low tightening torque is required. Furthermore, the machining head can be screwed on and off while the tool is clamped in a chuck. It is not necessary to remove the entire tool from the chuck to change the machining head.

[0022] It may also be advantageous for the machining head to have a first interface surface and / or a second interface surface, and for a front end region of the first holding element to have a first interface surface and / or a second interface surface, wherein the first interface surface of the machining head interacts with the first interface surface of the front end region during a connection process in which the machining head is connected to the second holding element, such that the machining head is moved in a self-centering manner into a concentric position with the first holding element. According to the invention, the machining head has a second interface surface that interacts with a second interface surface of the front end region such that the machining head is supported radially, in particular completely circumferentially, on the front end region.

[0023] This advantageously ensures reliable force transmission in the axial and radial directions via the interface surfaces from the machining head to the first holding element. It is possible to provide large effective interface surfaces.

[0024] It is particularly advantageous if the first interface surface of the machining head and the first interface surface of the front end region are designed as lateral surfaces of a truncated cone, in particular so that the first interface surface of the machining head and / or the first interface surface of the front end region are inclined at an angle in the range of 30° to 60°, in particular in the range of 40° to 50°, preferably of 45°, to the tool longitudinal axis.

[0025] If the machining head is screwed to the second holding element, the frustoconical lateral surfaces enable self-centering of the second holding element relative to the first holding element or, in other words, an automatically adjusting concentricity of the second holding element to the first holding element.

[0026] According to the invention, the second interface surface of the machining head is an outer surface of the machining head and is arranged in the passage of the first holding element, wherein the second interface surface of the front end region is an inner wall surface of the passage and wherein the second interface surface of the machining head is arranged between the inner wall surface and the second holding element.

[0027] The dimensioning and tolerance of the second interface surfaces can be coordinated in such a way that a fit, for example a clearance fit, is formed for force transmission in the radial direction, which allows a low-resistance screwing in of the machining head and at the same time ensures a tight fit of the machining head in the radial direction.

[0028] A further advantageous embodiment comprises that the rear end region of the second holding element and / or the rear end region of the first holding element has or have an anti-rotation device which prevents rotation of the first holding element relative to the second holding element, in particular at least in one screwing-in direction, preferably in both directions of rotation of the tool, in particular wherein the rear end region of the first holding element and the rear end region of the second holding element have at least one or more surfaces acting in a form-fitting manner against one another. For this purpose, the anti-rotation device can comprise surfaces acting in a form-fitting manner on the rear end region and / or the rear end region, which prevents or can prevent rotation of the first holding element relative to the second holding element.

[0029] The anti-twist device allows the machining head to be screwed onto the second holding element without the second holding element having to be additionally secured to the first holding element. Furthermore, a torque acting on the first holding element is transmitted via the anti-twist device to the second holding element and from there, particularly via the screw connection, to the machining head, thus providing advantageous torque transmission.

[0030] Embodiments in which the first holding element comprises a hard metal material, in particular consisting entirely of hard metal, may also be advantageous. Alternatively, the first holding element may comprise a heavy metal, in particular consisting entirely of a heavy metal. Furthermore, the first holding element may alternatively comprise a steel, in particular consisting entirely of a steel.

[0031] Alternatively or additionally, the second holding element can comprise a hard metal-free material, preferably a tool steel or a high-speed steel, in particular consisting entirely of hard metal-free material. Furthermore, alternatively or additionally, the machining head can comprise a hard metal material, in particular, the machining head having a sintered thread, preferably an internal thread sintered on or with the machining head, arranged within a cavity of the machining head.

[0032] This makes it possible to provide a tool that offers all the advantages of a carbide tool, while saving carbide material in a resource-efficient manner compared to tools made entirely of carbide. Furthermore, the floating bearing of the second retaining element is particularly advantageous for compensating for the relatively coarse tolerance of the sintered internal thread.

[0033] In a further advantageous embodiment, the machining head can be a milling head, a reaming tool, a twist drill head, a thread milling head, a thread drilling head or a thread former.

[0034] This provides a flexible modular tool that can be used with different machining heads

[0035] Advantageous embodiments and further developments according to the invention emerge from the respective dependent patent claims and also from the following description.

[0036] The invention will be further explained below using exemplary embodiments with reference to the drawings. Each of these shows a schematic representation: Fig. 1 shows a perspective exploded sectional view of a multi-part modular tool according to the invention; Fig. 2 shows a perspective exploded sectional view with assembled first and second holding elements and not yet assembled machining head of a tool according to the invention; Fig. Figure 3 shows a perspective sectional view of a tool according to the invention in assembled condition; Fig. Figure 4 shows a side view in section of a tool according to the invention in assembled condition; Fig. 5 shows a side view in section of a first holding element for a tool according to the invention; Fig. 6 shows a side view in section of a second holding element for a tool according to the invention; Fig. Figure 7 shows a side view in section of a machining head for a tool according to the invention;

[0037] Corresponding parts and sizes are shown in the figures Fig. 1 to 7 are provided with the same reference numerals.

[0038] Fig. 1 and Fig. 2 shows a multi-part modular tool 10 with a first holding element 14, a second holding element 16, and a machining head 12. The first holding element 14 is designed as an elongated sleeve having a front end region 14a, a rear end region 14b, and an intermediate central region 14c. The first holding element 14 also has a passage 14d in the form of a central through-bore along the longitudinal axis of the holding element 14. The longitudinal axis of the holding element 14 coincides with the tool's longitudinal axis A in a fully assembled tool 10.

[0039] The second retaining element 16 has a front end region 16a, a rear end region 16b, and a central region 16c located therebetween, and is designed as a substantially elongated bolt. The rear end region 16b has a larger diameter than the front end region 16a.

[0040] The second holding element 16 can be inserted into the first holding element 14 during assembly of the tool 10; the insertion direction is marked with an arrow and runs along the tool's longitudinal axis A.

[0041] The passage 14d is dimensioned such that the second holding element 16 can be introduced or pushed into the passage 14d, so that the rear end region 16b sits completely within the rear end region 14b, as shown in Fig. 2 is shown.

[0042] Furthermore, the tool 10 has a machining head 16 that can be screwed to the second holding element 16 in a screwing direction E. Preferably, the screwing direction E is opposite to a working direction of rotation S of the machining head 16, thereby preventing an unintentional detachment of the machining head 16 from the second holding element 16 during rotation of the tool 10 in the direction of the working direction of rotation S.

[0043] Fig. Figure 2 shows the second holding element 16 received in the passage 14d. The machining head 12 can be connected to the front end portion 16a of the second holding element 16 by screwing it on.

[0044] Fig. 3 and Fig. 4 show the tool 10 in a fully assembled state. The tool 10 has an interface that enables the first and second holding elements 14, 16 and the machining head 12 to be connected to one another.

[0045] The front end portion 16a of the second holding element 16 has an external thread 32, so that the machining head 12 can be screwed onto the front end portion 16a. For this purpose, the machining head 12 is provided with a cavity 18, the inner wall of which has an internal thread 20 corresponding to the external thread 32.

[0046] On the outside, the machining head 12 has a working area 22, which can be designed according to the tool type of the tool 10. For example, the machining head 12 can be provided as a milling head, a reaming tool, a twist drill, a thread milling tool, a tapping tool, or a thread former and can have a corresponding working area 22.

[0047] As in Fig. 2 and Fig. 3, the machining head 12 has a first and a second interface surface 24, 28. The first holding element 14 has corresponding first and second interface surfaces 26, 30, which are aligned with or aligned with the first and second interface surfaces 24, 28 and interact with them during and after completion of the connection process, i.e., during screwing and in the tightly screwed state of the machining head 12.

[0048] The respective first interface surfaces 24, 26 are designed as the outer surfaces of a truncated cone and are inclined toward the tool's longitudinal axis A. When the machining head 12 is screwed onto the external thread 32, the interface surfaces 24, 26 slide onto one another due to their shape into a concentric position. As a result, during screwing on, the machining head 12 is pulled into a position concentric with the first holding element 14 and thus with the tool's longitudinal axis A. Accordingly, the second holding element 16 is also pulled toward a position concentric with the tool's axis A and, in the fully assembled state, is ideally arranged concentrically with it.

[0049] The respective second interface surfaces 28, 30 are radially opposite one another in the fully screwed state of the machining head 12 and are arranged concentrically to one another. The interface surface 28 of the machining head 12 supports the machining head 12 in the radial direction R on the interface surface 30 of the first holding element 14, in particular against radial forces that arise during machining of a workpiece on and in the machining head 12. The respective second interface surfaces 28, 30 are oriented parallel to the tool's longitudinal axis A and are also aligned parallel to it.

[0050] The machining head 12 also has a wrench size 36, which allows the application of a tightening torque using a torque wrench. Furthermore, the cavity 18 can be supplied with coolant via a coolant channel 34, which can be directed into the work area 22 through corresponding channels.

[0051] It should be noted that the longitudinal axis of the holding element 14 defines the tool's longitudinal axis A. The holding element 14 is intended to be clamped in a chuck of a machine tool and is intended to be rotated by the machine tool. If the longitudinal axis of the holding element 14 deviates from a rotational axis of the chuck, the tool 10 will run unevenly. Therefore, the first holding element 14 is manufactured with small positional and shape tolerances in order to achieve high accuracy with respect to the longitudinal axis of the first holding element 14.

[0052] The second holding element 16, which is accommodated within the first holding element 14, can be manufactured with relatively larger tolerances, since a not completely coaxial position of the second holding element 16 within the first holding element 14 can lead to an imbalance of the tool 10, which can, however, be absorbed by a high strength or rigidity of the first holding element 14 without negatively affecting the concentricity properties of the tool 10.

[0053] This is one of the reasons why the first holding element is made of hard metal and the second holding element is made of conventional tool steel, for example.

[0054] To connect the first holding element 14 to the second holding element 16, the rear end region 16b of the second holding element 16 has a recess 40 in which an elastic fixing element 44, for example an O-ring, is received. The rear end region 14b of the first holding element 14 has a corresponding recess, so that the second holding element 16 with the fixing element 44 can be pushed into the first holding element 14 until the fixing element 44 engages in the recess 40 and the recess of the first holding element 14, which then lie opposite one another and thus define the mounted position of the first holding element 14 relative to the second holding element 16. In this way, the second holding element 16 is secured in the first holding element 14 against falling out.

[0055] The rear end region 16b also has a shaped element as a tightening force absorption element 42, which can interact with a corresponding shaped element of the inner wall of the passage 14d and fixes the second holding element 16 in its axial position in the manner of a screw head against the tightening force during the screwing-in process of the machining head 12.

[0056] The rear end regions 14b, 16b of the first and second holding elements 14, 16 form a cooling lubricant inlet 46, which is designed for coupling to a cooling lubricant supply and, in particular, for supplying a minimum quantity lubrication system. Corresponding cooling lubricant channels 48a, b of the machining head 12 are provided.

[0057] Fig. Figure 5 shows a sectional view of a first holding element 14 for a tool 10 according to the invention. It can be seen that the passage 14d has a constant diameter in the central region 14c, which widens in the front end region 14a and the rear end region 14b, respectively.

[0058] In the front end region 14a, the first interface surface 26 can be seen, which is designed as a lateral surface of a truncated cone and is arranged at an angle of 45 degrees to the tool longitudinal axis A.

[0059] The second interface surface 30 is formed on an inner wall surface of the passage 14d in the front end region 14a and projects in the radial direction toward the tool longitudinal axis A.

[0060] Torque-absorbing surfaces 50a, b are formed in the rear end region 14b, which, together with corresponding elements of the second retaining element 16, form an anti-rotation device. A circumferential recess 52 is formed in the wall of the passage 14d, into which the fixing element 22, in particular an O-ring, can engage and which is intended to cooperate with the recess 40 of the second retaining element 16 and the fixing element 22.

[0061] Fig. Figure 6 shows a sectional view of a second holding element 16 for a tool 10 according to the invention. The second holding element 16 is designed as a threaded bolt and has an external thread 32 in the front end region 16a for screwing to the machining head 12.

[0062] In the rear end region 16b, the tightening force-absorbing element 42 is provided with a tightening force-absorbing surface 42a, which is designed as a radially projecting shaped element. Axially offset rearward from the tightening force-absorbing element 42 is the recess 40, into which the fixing element 44, or an O-ring, can engage. The torque-absorbing section 38 can optionally also be provided with a tightening force-absorbing surface 38a for action in the axial direction.

[0063] Fig. Figure 7 shows a sectional view of a machining head 12 for a tool 10 according to the invention. Internal cooling lubricant channels 48a, b extend through the machining head 12, which can be supplied with cooling lubricant from the cavity 18. This allows the tool 10 to be minimally lubricated.

[0064] In addition, the first and second interface surfaces 24, 28 of the machining head 12 can be seen, wherein the second surface 24 is also inclined at an angle of 45 degrees to the tool longitudinal axis A and thus the Fig. 5 and can interact with it to absorb forces in the axial and / or radial directions. The internal thread 20 is arranged in the cavity 18a so that the machining head 12 can be easily screwed to the external thread 32. List of reference symbols 10 tools 12 machining head 14 First holding element 14a Front end area 14b Rear end area 14c Middle Range 14d passage 16 Second holding element 16a Front end area 16b Rear end area 16c Middle Range 18 cavity 20 internal threads 22 Work area 24 First interface surface of the machining head 26 First interface surface of the first holding element 14 28 Second interface surface of the machining head 30 Second interface surface of the first holding element 14 32 external thread 34 Coolant / lubricant channel 36 key size 38 Torque absorption section 38a Tightening force absorption surface 40 recess 42 Tightening force absorption element 42a Tightening force absorption surface 44 Fixing element 46 Coolant / lubricant inlet 48a,b Coolant / lubricant channel 50a, b Torque bearing surfaces 52 recess 54 recess A Tool longitudinal axis E Screwing direction S Working direction R Radial direction

Claims

[1] Multi-part, modular tool (10) rotatable about a tool longitudinal axis (A), comprising: - a machining head (12); - a first holding element (14) having a body (14c) elongated along the tool longitudinal axis (A), in which a passage (14d) extends along the tool longitudinal axis (A); - a second holding element (16) which can or extends at least partially in the passage (14d) of the first holding element (14); wherein the machining head (12) is connectable or connected to the second holding element (16) in such a way that the machining head (12) is fixedly fixed to the first holding element (14) at least in the axial direction and / or in the radial direction (R), and wherein the passage (14d) of the first holding element (14) and the second holding element (16) are coordinated with one another in such a way that during a connecting process in which the machining head (12) is connected to the second holding element (16), the second holding element (16) is movable or is moved relative to the first holding element (14), and wherein the machining head (12) has a cavity (18) which is provided to receive a front end region (16a) of the second holding element (16), and wherein the machining head (12) has an internal thread (20) arranged within the cavity (18), which is screwable or is screwed onto an external thread (32) provided on the front end region (16a), and wherein the machining head (12) has a second interface surface (28) and wherein a front end region (14a) of the first holding element (14) has a second interface surface (30), wherein the second interface surface (28) of the machining head (12) and the second interface surface (30) of the front end region (14a) interact such that the machining head (12) is supported radially, in particular completely circumferentially, on the front end region (14a), and wherein the second interface surface (28) of the machining head (12) is an outer surface of the machining head (12) and is arranged in the passage (14d) of the first holding element (14), and wherein the second interface surface (30) of the front end region (14a) is an inner wall surface of the passage (14d), and wherein the second interface surface (28) of the machining head (12) is arranged between the inner wall surface and the second holding element (16). [2] Tool according to claim 1, characterized by that the first holding element (14) has a front end region (14a) and a rear end region (14b) arranged opposite the front end region (14a), and wherein the second holding element (16) has a front end region (16a) and a rear end region (16b) arranged opposite the front end region (16a), in particular wherein the rear end region (16b) of the second holding element (16) is or can be received within the rear end region (14b) of the first holding element (14) and / or wherein the front end region (16a) of the second holding element (16) extends in or through the front end region (14a) of the first holding element (14), in particular protruding beyond it in the axial direction. [3] Tool (10) according to claim 2, characterized by that the rear end region (16b) of the second holding element (16) is fixed relative to the rear end region (14b) of the first holding element (14) during a connecting process in which the machining head (12) is connected to the second holding element (16), in particular in at least one axial direction, and / or wherein the front end region (16a) of the second holding element (16) is or is moved relative to the front end region (14a) of the first holding element (14) during a connecting process in which the machining head (12) is connected to the second holding element (16), in particular in the radial direction (R). [4] Tool (10) according to claim 2 or 3, characterized by that the rear end region (16b) of the second holding element (16) is or can be secured within the rear end region (14b) of the first holding element (14), in particular by a fixing element (44), preferably an elastic fixing element (44), in particular such that the rear end region (16b) of the second holding element (16) is arranged concentrically to the rear end region (14b) of the first holding element (14), and / or characterized bythat the front end region (16a) of the second holding element (16) extends in or through the front end region (14a) of the first holding element (14) such that it can move, in particular radially, relative to the front end region (14a) of the first holding element (14) during the connecting process in which the machining head (12) is connected to the second holding element (16). [5] Tool (10) according to one of claims 2 to 4, characterized by that the front end region (16a) of the second holding element (16) is arranged concentrically to the front end region (14a) of the first holding element (14) when the machining head (12), in particular after the end of the connecting process, is connected to the second holding element (16) in such a way that the machining head (12) is firmly fixed to the first holding element (14). [6] Tool (10) according to one of claims 2 to 5, characterized bythat the front end region (16a) of the second holding element (16) is spaced from the front end region (14a) of the first holding element (14), in particular such that a circumferential gap is provided between the front end region (16a) of the second holding element (16) and the front end region (14a) of the first holding element (14). [7] Tool (10) according to one of the preceding claims, characterized byin that the machining head (12) has a first interface surface (24) and wherein a front end region (14a) of the first holding element (14) has a first interface surface (26), in particular wherein the first interface surface (24) of the machining head (12) cooperates with the first interface surface (26) of the front end region (14a) during a connecting process in which the machining head (12) is connected to the second holding element (16) in such a way that the machining head (12) is moved in a self-centering manner into a concentric position with the first holding element (14). [8] Tool (10) according to claim 7, characterized bythat the first interface surface (24) of the machining head (12) and the first interface surface (26) of the front end region (14a) are designed as lateral surfaces of a truncated cone, in particular so that the first interface surface (24) of the machining head (12) and / or the first interface surface (26) of the front end region (14a) are inclined at an angle in the range of 30° to 60°, in particular in the range of 40° to 50°, preferably of 45°, to the tool longitudinal axis (A). [9] Tool (10) according to one of claims 2 to 8, characterized byin that the rear end region (16b) of the second holding element (16) and / or the rear end region (14b) of the first holding element (14) has or have an anti-rotation device (50a, 50b) which prevents rotation of the first holding element (14) relative to the second holding element (16), in particular at least in one screwing-in direction (E), preferably in both directions of rotation of the tool (10), in particular wherein the rear end region (14b) of the first holding element (14) and the rear end region (16b) of the second holding element (16) have at least one or more surfaces acting against one another in a form-fitting manner, wherein the anti-rotation device (50a, 50b) comprises surfaces acting in a form-fitting manner on the rear end region (14b) and / or the rear end region (16b), which prevent rotation of the first holding element (14) relative to the second holding element (16). [10] Tool (10) according to one of the preceding claims, characterized bythat the first holding element (14) comprises a hard metal material, in particular consists entirely of hard metal, or comprises a heavy metal, in particular consists entirely of heavy metal, or comprises a steel, in particular consists entirely of a steel, and / or that the second holding element (16) comprises a hard metal-free material, preferably a tool steel or a high-speed steel, in particular consists entirely of hard metal-free material, and / or that the machining head (12) comprises a hard metal material, in particular wherein the machining head has a sintered thread, preferably an internal thread (20) arranged within a cavity (18) of the machining head (12) and sintered on or with the machining head (12). [11] Tool (10) according to one of the preceding claims, characterized bythat the machining head (12) can be a milling head, a reaming tool, a twist drill head, a thread milling head, a thread drilling head or a thread former.

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