Device comprising a rotary tool and method for fastening or detaching a cutting insert in such a device

Abstract

Device (2) comprising a rotary tool (4), a. wherein the rotary tool (4) extends along a longitudinal axis (L) and in an axial direction (A), b. wherein the rotary tool (4) comprises a body (6), a cutting insert (8) and a clamping rod (22), c. wherein the body (6) has a shaft (12) on the rear side for clamping into a holder (14), d. wherein the clamping rod (22) extends through the body (6) in the axial direction (A), e. wherein the clamping rod (22) is designed at the front for fastening the cutting insert (8), f. wherein the clamping rod (22) extends towards the rear in the direction of the shaft (12) and can be actuated by means of a tool to attach or detach the cutting insert (8) from the body (6), g. wherein this has an access hole (32) which is arranged such that the clamping rod (22) can be actuated while the rotary tool (4) is clamped in the holder (14), characterized in that h. that the rotary tool (4) is designed such that when the clamping rod (22) is actuated, it is rotated and thereby the cutting insert (8) is fastened or loosened.

Description

Background of the invention

[0001] The invention relates to a device comprising a rotary tool and a method for changing a cutting insert in such a device. The device is, for example, identical to the rotary tool or is a combination of a holder and the rotary tool clamped in the holder. The rotary tool is, for example, a drill bit.

[0002] Especially with a modular rotary tool, ease of use is highly desirable. A modular rotary tool consists of a body and a separate cutting insert, which can be detachably attached to the body. Attaching or detaching, and generally changing, the cutting insert is therefore quite complex and is typically done manually using a separate tool, such as a screwdriver.

[0003] Reference is made to DE 696 29 943 T2. Object of the invention

[0004] Against this background, an object of the invention is to simplify the fastening or detaching of a cutting insert of a rotary tool. In particular, fastening or detaching should be possible without having to remove the body from the holder. Furthermore, fastening or detaching should be particularly automatable, so that a fully automatic change of the cutting insert is possible. In addition, the rotary tool should be as stable as possible at the front, i.e., in the area of ​​the cutting insert. Solution to the task

[0005] The problem is solved according to the invention by a device with the features of claim 1 and by a method with the features of claim 10. Advantageous embodiments, further developments, and variants are the subject of the dependent claims. The descriptions relating to the device also apply mutatis mutandis to the method and vice versa.

[0006] The device comprises a rotary tool, preferably a drill, a milling cutter, or a reamer. The rotary tool extends along a longitudinal axis and in an axial direction. During operation, the rotary tool rotates about its longitudinal axis to machine a workpiece. The rotary tool has a body and a cutting insert and is therefore modular. The cutting insert has at least one cutting edge for machining a workpiece during operation. The cutting insert can be inserted into the body from the front, i.e., in an assembled state. Preferably, the cutting insert is clamped between two front arms of the body and thus secured to it. The cutting insert is, for example, a cutting plate.

[0007] The tool body has a shank at the rear for clamping into a holder. The holder is, in particular, a component of a machine tool. The holder is, for example, a chuck, such as a hydraulic expansion chuck. The holder preferably has a clamping sleeve with which the rotary tool is clamped. The rotary tool has, in particular, one or more flutes extending along the body to the shank. The shank represents a rear end of the rotary tool. The shank therefore begins, in particular, where the flutes end and is flute-free. The shank forms a rear end of the tool body. A working section adjoins the shank, correspondingly forming a front end of the tool body. The tool body is thus divided into a shank and a working section, which are, in particular, manufactured as a single piece (monolithically).The shank is preferably purely cylindrical or purely conical in shape and preferably has no chip-removing or chip-guiding elements. In contrast, any flutes and, if applicable, cutting edges (e.g., secondary cutting edges in addition to the cutting edges of the insert) are part of the working section. The shank is, in particular, set off from the working section by a circumferential chamfer or step in the radial direction. The rotary tool, especially its body, has, in particular, a diameter that is larger on the shank than on the working section.

[0008] The rotary tool further comprises a clamping rod. The clamping rod extends axially through the body and preferably along the longitudinal axis, i.e., centrally or in the center of the body. In a suitable embodiment, the clamping rod runs through a media channel of the rotary tool and, in particular, has a smaller diameter than the media channel. The media channel serves to supply a working medium (e.g., a coolant and / or lubricant) to the cutting insert. The working medium is introduced, in particular, through a rear opening of the body and exits, in particular, through one or more outlet openings at the front.

[0009] The clamping rod is designed at the front for attaching the cutting insert. In a suitable embodiment, the clamping rod has a front end configured as an external or internal thread. The cutting insert has a corresponding internal or external thread and is then screwed onto the clamping rod for attachment. In another suitable embodiment, a bayonet fitting is provided, with two coupling elements, one of which is located on the cutting insert and the other at the front end of the clamping rod. To mount the cutting insert, it is inserted into the body from the front and placed onto the clamping rod. The clamping rod is then rotated so that the cutting insert is drawn into the body and secured. To release, the clamping rod is rotated in the opposite direction.Instead of a screw connection, other connections are also suitable, e.g., a plug connection. Connections in which the cutting insert is fastened or detached by a purely axial displacement (i.e., in the axial direction) of the clamping rod are also fundamentally possible.

[0010] To enable a change of the cutting insert (i.e., loosening the cutting insert and subsequently attaching a different one) while the rotary tool is clamped in the holder, it is generally possible to drive the clamping rod from the front, for example, by a lateral screw in the body that extends radially and is generally located at the front. However, this creates a hole in the body near the cutting insert, which negatively impacts the stability of the rotary tool and reduces its rigidity. Since one or more flutes are typically also machined into the body in this area, the structure is already weakened. Furthermore, chips can become trapped in the area of ​​the screw or the associated hole and disrupt the operation of the device. A lateral screw also creates adverse lateral forces in the rotary tool.

[0011] In this case, the clamping rod extends towards the rear of the shaft and can be operated with a tool to attach or detach the cutting insert from the body. "Attach or detach" means that both fastening and detaching are possible, depending on whether the cutting insert is to be inserted or removed. The clamping rod is operated by the tool either directly (e.g., via a tool engagement on the clamping rod) or indirectly (e.g., via another element that has a tool engagement and is appropriately connected to the clamping rod). The tool could be, for example, a screwdriver.

[0012] The shank is comparatively massive compared to the rest of the rotary tool and is significantly more stable, rigid, and less stressed than the front part (especially the tip) of the rotary tool. A similar principle applies to the rear end of the working section, which connects directly to the shank, as any flutes taper off at this end and are therefore shallower. This rear end has a length that preferably corresponds to no more than twice the diameter of the rotary tool. In a suitable embodiment, this length is at most 20% of the total length of the working section; however, in the case of a rotary tool with a very short working section, the length may exceed 20% of the total length.In addition, the rear end is suitably set off from the rest of the working section by a chamfer or step (not necessarily all around due to the clamping grooves), similar to the shaft.

[0013] The clamping rod preferably extends into the shank on the rear side (i.e., in particular, "ends in the shank") and can then be actuated there, i.e., in particular, within the shank, by means of the tool. Alternatively, the clamping rod extends only to the rear end of the working section, preferably ends there, and can also be actuated there by means of the tool. In this case, the clamping rod preferably extends into a chip-groove-free portion of the working section, which, viewed axially, lies between the shank and the chip grooves, or into a run-out area of ​​the working section where the chip grooves terminate. However, an embodiment in which the clamping rod extends completely through the shank is also suitable.

[0014] Accordingly, the access point required for actuation is advantageously relocated from the front to the rear. This results in high stability and rigidity at the front. However, such rear actuation typically necessitates removing the rotary tool from its holder to change the cutting insert. Therefore, the device additionally features an access hole, positioned so that the clamping rod can be actuated while the rotary tool is clamped in its holder. In other words, the clamping rod can be actuated through the access hole, and the access hole is accessible even when the tool is clamped. This advantageously allows for actuation of the clamping rod and thus a change of the cutting insert while the rotary tool is clamped in its holder.There are various suitable designs for the arrangement of the access hole and the manner in which the clamping rod is operated using the tool, which are explained in more detail below.

[0015] In a first preferred embodiment, the device is identical to the rotary tool. In a second preferred embodiment, the device is a combination of the rotary tool and the holder; for example, the device is a machine tool with a holder into which the rotary tool is clamped.

[0016] “Frontal” is understood to mean in particular “on / in / at a front half of the body”, especially in the area of ​​the cutting insert, and “rearal” analogously “on / in / at a rear half of the body”, especially in the area of ​​the shaft.

[0017] The clamping rod is advantageously mounted on the body and, in particular, fixed in the axial direction. In a first suitable embodiment, a stop for the clamping rod is formed in the body in the axial direction. In a second suitable embodiment, the clamping rod and the body are mounted to one another by means of a threaded connection, which also effectively fixes the clamping rod. For example, the clamping rod has a right-hand / left-hand thread, with a right-hand threaded section for attaching the cutting insert as already described, and a left-hand threaded section for fastening in the body, which has a correspondingly complementary internal thread (the left-hand and right-hand threaded sections can also be interchanged). In any case, it is ensured that the clamping rod is not arbitrarily movable relative to the body in the axial direction, but is fixed.

[0018] The rotary tool is designed such that when the clamping rod is actuated, it rotates, thereby securing or releasing the cutting insert. By rotating the clamping rod in one direction or the other, the cutting insert is then secured or released accordingly, e.g., screwed in, as described above. The clamping rod is rotatable, in particular about its longitudinal axis. For rotation, the clamping rod is driven either directly or indirectly by the tool. Alternatively, purely axial actuation is also possible, whereby an axial displacement, i.e., a movement in the axial direction, would actuate the clamping rod and thereby secure or release the cutting insert.

[0019] Preferably, the device has a transverse pin which, together with the clamping rod, forms a mechanism such that actuation of the transverse pin by means of the tool actuates the clamping rod, thereby securing or releasing the cutting insert. The access hole is formed in the shaft or at the rear end of the working section, and the transverse pin is seated in this access hole. To change the cutting insert, the transverse pin is actuated by the tool, and the transverse pin then drives the clamping rod, thus securing or releasing the cutting insert in the desired direction. The transverse pin is accessible from outside the rotating tool. The transverse pin is particularly cylindrical. At one end, which protrudes outwards from the access hole, the transverse pin expediently has a tool engagement for the tool.

[0020] It is also conceivable that there is no cross pin in the access hole and the tool is inserted through the access hole to directly actuate the clamping rod.

[0021] In an advantageous embodiment, the clamping rod has a thickening on its rear side, with an inclined and, in particular, annular contact surface, i.e., the contact surface forms an angle of more than 90° with the longitudinal axis. The thickening preferably forms a rear end of the clamping rod. The transverse pin preferably interacts with the contact surface at its end such that the clamping rod is driven when the transverse pin is actuated. For this purpose, the transverse pin and the contact surface are provided, in particular, with suitable toothed surfaces, e.g., in the manner of a bevel gear.

[0022] In a suitable embodiment, the access hole is arranged at an angle of no more than 75° relative to the longitudinal axis. This refers to the angle at the front. The angle is, in particular, greater than 0°.

[0023] Preferably, the transverse pin extends along a pin axis and can be actuated either by axial movement in the direction of the pin axis or by rotation about the pin axis. Thus, two different actuation methods are advantageous in principle. Since the transverse pin is located in the access hole, the pin axis also extends along the access hole and therefore at a corresponding angle to the longitudinal axis.

[0024] As an alternative to the access hole in the shaft or the rear end of the working section of the rotary tool, the device, in a suitable embodiment, has a holder into which the rotary tool can be clamped, so that in a clamped state the shaft is clamped in the holder and the holder now has the access hole through which the clamping rod can be actuated, in particular from outside the holder and through it. The access hole is, for example, provided in a wall of the holder.

[0025] Preferably, the access hole extends radially perpendicular to the axial direction, and the holder includes a gearbox with a transverse pin seated in the access hole and an axial pin connected to the clamping rod. The gearbox is designed such that actuation of the transverse pin by the tool drives the axial pin and, consequently, the clamping rod, thereby securing or releasing the cutting insert. The axial pin and the clamping rod are either manufactured as a single piece (monolithic) or as two separate components. In the latter case, the axial pin and the clamping rod are suitably connected to each other, for example, via appropriate plug-in or engagement contours.

[0026] The transverse pin preferably extends radially and advantageously not directly towards the longitudinal axis, but laterally past it. The transmission is then implemented, for example, as a worm gear, where the transverse pin has a worm thread and the axial pin has a suitably appropriate toothing to interact with the transverse pin. However, other types of transmissions are also possible and suitable in principle, especially a bevel gear as described above, where the transverse pin advantageously runs towards the axial pin and the longitudinal axis, preferably at an angle to the longitudinal axis of less than 90°.

[0027] Generally, the transverse pin and the clamping rod (and optionally the axial pin) together form a mechanism, in particular a clamping mechanism, for attaching and releasing the cutting insert. In the embodiment described above, with the transverse pin located at the rear end of the working section or in the shaft, this mechanism is fully integrated into the rotary tool. However, it is also suitable to partially relocate the mechanism to the holder, so that the mechanism is formed by the combination of the rotary tool and the holder. This is the case in the alternative described above. The clamping rod remains part of the rotary tool, but its actuation is now effected via the access hole and the transverse pin (and optionally the axial pin) of the holder.

[0028] The statements regarding the access hole, the gear and the cross pin in connection with the design with the access hole in the shaft also apply analogously to the design with the access hole in the holder and vice versa.

[0029] Advantageously, the clamping rod protrudes from the shaft at the rear and in the axial direction. In particular, the clamping rod is thus longer than the body. When clamped, the clamping rod extends into the holder and can then be actuated from there, either directly with the tool or indirectly via the transverse pin and, if necessary, the additional axial pin.

[0030] As an alternative to a radial access hole in the holder, a design in which the access hole extends along the longitudinal axis is also advantageous. Actuation with the tool then occurs along the longitudinal axis, and the clamping rod has a corresponding tool engagement at its rear end. This design is particularly simple, as no additional mechanism or gear is required to actuate the clamping rod; instead, it is actuated directly by the tool through the holder.

[0031] This method is used to attach or detach, specifically to change, a cutting insert in a device as described above. The cutting insert is detached or attached, specifically changed, while the rotary tool is clamped in the holder.

[0032] The device configurations described above are particularly suitable for fully automatic attachment and removal of the cutting insert, preferably by means of a robot. Manual intervention is not required. Accordingly, the described method is also preferably carried out fully automatically, in particular by a robot. This also enables automatic indexing of cutting inserts for multiple applications. Advantageously, this is combined with a pre-setter functionality. Description of the characters

[0033] The following section provides a more detailed explanation of exemplary embodiments of the figures with the aid of a drawing. Each drawing schematically depicts: Fig. 1 an exploded view of a holder and a rotary tool, Fig. 2a Holder and rotary tool made of Fig. 1 in a side view, Fig. 2b a sectional view starting from Fig. 2a, Fig. 3a the rotary tool from Fig. 1 in a side view, Fig. 3b a sectional view starting from Fig. 3a, Fig. 4 a variant of the holder and the rotary tool made of Fig. 1, Fig. 5 Holder and rotary tool made of Fig. 4 in an exploded view, Fig. 6a Holder and rotary tool made of Fig. 4 in a side view, Fig. 6b a sectional view starting from Fig. 6a, Fig. 7a Holder and rotary tool made of Fig. 4 in another side view, Fig. 7b a sectional view starting from Fig. 7a, Fig. 8 another variant of the holder and the rotary tool made of Fig. 1. Description of the exemplary embodiment

[0034] In the Fig. Figures 1 to 8 show various embodiments of a device 2. The device 2 has a rotary tool 4, in each case a drill bit. The rotary tool 4 extends along a longitudinal axis L and in an axial direction A. The longitudinal axis L runs in the axial direction A. During operation, the rotary tool 4 rotates about the longitudinal axis L to machine a workpiece. The rotary tool 4 has a body 6 and a cutting insert 8 and is therefore modular. The cutting insert 8 has at least one cutting edge (not explicitly designated) for machining a workpiece during operation. The cutting insert 8 can be inserted into the body 6 from the front, i.e., in an assembled state, as shown in Figure 8. Fig. 2a, Fig. 4 or Fig. Figure 6a shows the cutting insert 8 clamped between two front arms 10 of the body 4 and thus attached to it. In the illustrated embodiments, the cutting insert 8 is a cutting plate.

[0035] The body 6 has a shank 12 on its rear side for clamping into a holder 14. The holder 14 has, for example, a clamping sleeve 16 with which the rotary tool 4 is clamped. In the embodiments shown here, the rotary tool 4 also has several clamping grooves 18, which extend along the body 6 to the shank 12. The shank 12 represents a rear end of the body 6 and also of the rotary tool 4 as a whole. In this case, the shank 12 begins where the clamping grooves 18 end and is free of clamping grooves. A working section 20 adjoins the shank 12, which accordingly forms a front end of the body 6. The body 6 is thus divided into a shank 12 and a working section 20, which, however, are manufactured in one piece (monolithically) in this case. The shaft 12 is purely cylindrical in shape and has no chip-removing or chip-guiding elements.In contrast, any flutes 18 and, where applicable, cutting edges (e.g., secondary cutting edges, in addition to the cutting edges of the cutting insert 8) are part of the working section 20. The shank 12 is set off from the working section 20 by a circumferential chamfer or step in the radial direction R. The rotary tool 4 shown here also has a diameter D, which is larger on the shank 12 than on the working section 20.

[0036] The rotary tool 4 further comprises a clamping rod 22. The clamping rod 22 extends in the axial direction A through the body 6 and along the longitudinal axis L, i.e., centrally or in the center of the body 6. In the embodiments shown here, the clamping rod 22 runs through a media channel of the rotary tool 4 (not explicitly designated) and has a smaller diameter than this media channel. The media channel serves to supply a working medium (e.g., a coolant and / or lubricant) to the cutting insert 8. In this case, the working medium is introduced through a rear opening of the body 6 and exits at the front through several outlet openings.

[0037] The clamping rod 22 is designed at its front for attaching the cutting insert 8. For this purpose, the clamping rod 22, in the embodiments shown here, has a front end 24 which is designed as an external thread. The cutting insert 8 has a corresponding internal thread and is then screwed onto the clamping rod 22 for attachment. To mount the cutting insert 8, it is inserted into the body 6 from the front and placed onto the clamping rod 22. The clamping rod 22 is then rotated so that the cutting insert 8 is drawn into the body 6 and thereby secured. To release, the clamping rod 22 is rotated in the opposite direction. However, other connections, not explicitly shown, are also suitable instead of such a screw connection.

[0038] In this case, the clamping rod 22 extends at least to the rear of the shaft 12 and can be actuated there by means of a tool (not explicitly shown) to attach or detach the cutting insert 12 from the body 6. "Attach or detach" means that both fastening and detaching are possible, depending on whether the cutting insert 8 is to be inserted or removed. The clamping rod 22 is actuated by the tool either directly (e.g., via a tool engagement for the tool on the clamping rod 22) or indirectly (e.g., via another element that has a tool engagement for the tool and is suitably connected to the clamping rod 22). The tool could, for example, be a screwdriver.

[0039] The shank 12 is comparatively massive compared to the rest of the rotary tool 4 and is significantly more stable, stiffer, and less stressed than the front part (especially a tip) of the rotary tool 4. The same applies to a rear end 26 of the working section 20, which connects directly to the shank 12, since any clamping grooves 18 taper off at this end 26 and are therefore shallower. This rear end 26 has a length 28, which is at most twice the diameter D. Furthermore, the rear end 26, like the shank 12, is set off from the rest of the working section 20 by a chamfer or step (not necessarily circumferential due to the clamping grooves 18).

[0040] In an alternative not shown, the clamping rod 22 does not extend into the shaft 12, but only to just before it, i.e. to the rear end 26, and ends there.

[0041] The access required for actuating the clamping rod 22 is located at the rear. This results in high stability and rigidity at the front. However, such rear actuation typically requires that the rotary tool 4 be removed from the holder 14 to change the cutting insert 8. Therefore, the device 2 additionally features an access hole 32, which is positioned such that the clamping rod 22 can be actuated while the rotary tool 4 is clamped in the holder 14. In other words, the clamping rod 22 can be actuated through the access hole 32, and this access hole 32 is accessible when the tool is clamped. This allows for actuation of the clamping rod 22 and a change of the cutting insert 8 while the rotary tool 4 is clamped in the holder 14.

[0042] Various configurations are possible for the arrangement of the access hole 32 and the manner in which the clamping rod 22 is actuated by means of the tool, some of which are described in the Fig. Numbers 1 to 8 are shown. These show... Fig. 1 to 3b a first design, which Fig. 4 to 7b a second design and the Fig. 8 a third design. In the Fig. In 1 to 3b, the device 2 is identical to the rotary tool 4; the holder 14 is not necessarily part of the device 2. Fig. In contrast, devices 2 to 4 are a combination of the rotary tool 4 and the holder 14.

[0043] In this context, “front” means “on / in / at a front half of the body 6”, specifically in the area of ​​the cutting insert 8, and “rear” means analogously “on / in / at a rear half of the body 6”, specifically in the area of ​​the shaft 12.

[0044] The clamping rod 22 is mounted on the body 6 and fixed in axial direction A. This is particularly evident in the sectional views of the Fig. 2b, Fig. 3b and Fig. 7b. For example, a stop for the clamping rod 22 in axial direction A is formed in the body 6, or the clamping rod 22 and the body 6 are mounted to each other by means of a threaded connection, e.g. the clamping rod 22 has a right-left thread.

[0045] In the embodiments shown here, the rotary tool 4 is designed such that when the clamping rod 22 is actuated, it rotates, thereby fastening or loosening the cutting insert 8. By rotating the clamping rod 22 in one direction or the other, the cutting insert 8 is then fastened or loosened accordingly, e.g., screwed in. The clamping rod 22 is rotatable about its longitudinal axis L. For rotation, the clamping rod 22 is driven either directly or indirectly by the tool. However, a purely axial actuation would also be possible, in which an axial displacement, i.e., a displacement in the axial direction A, actuates the clamping rod 22 and thereby fastens or loosens the cutting insert 8.

[0046] In the design according to the Fig. In the device 2, as shown in figures 1 to 3b, a transverse pin 34 is engaged with the clamping rod 22 to form a mechanism. This mechanism is designed such that actuation of the transverse pin 34 by means of the tool actuates the clamping rod 22, thereby fastening or unfastening the cutting insert 8. In the illustrated embodiment, the access hole 32 is located in the rear end 26 of the working section 20. In an embodiment not shown, the access hole 32 is located in the shaft 12. The transverse pin 34 is seated in the access hole 32. To change the cutting insert 8, the transverse pin 34 is actuated by the tool, and the transverse pin 34 then drives the clamping rod 22, thereby fastening or unfastening the cutting insert 8 in the desired direction. The transverse pin 34 is accessible from outside the rotary tool 4.The transverse pin 34 is cylindrical in this case and has a tool engagement for the tool at the end which points outwards from the access hole 32.

[0047] In principle, it is also possible to have a design in which no cross pin 34 is inserted in the access hole 32 and the tool is inserted through the access hole 32 to actuate the clamping rod 22 directly.

[0048] In the exemplary embodiment of the Fig. In sections 1 to 3b, the clamping rod 22 has a thickening 36 on its rear side, with an inclined and also annular contact surface 38. The thickening 36 also forms a rear end of the clamping rod 22. The transverse pin 34 interacts with the contact surface 38 at its end such that actuation of the transverse pin 34 drives the clamping rod 22. For this purpose, the transverse pin 34 and the contact surface 38 are provided, for example, with suitable toothed surfaces.

[0049] In the embodiment shown here, the access hole 32 is arranged at an angle W of at most 75° relative to the longitudinal axis L. This refers to the angle W at the front.

[0050] The transverse pin 34 extends along a pin axis S and can be actuated either by an axial movement in the direction of the pin axis S or by a rotation about the pin axis S. Since the transverse pin 34 is located in the access hole 32, the pin axis S also extends along the access hole 32 and thus at a corresponding angle W to the longitudinal axis L.

[0051] As an alternative to the access hole 32 in the shaft 12 or the rear end 26 of the working section 20 of the rotary tool 4, the device 2 in the embodiments of the Fig. 4 to 8 a holder 14 into which the rotary tool 4 can be clamped, so that in the clamped state the shaft 12 is clamped in the holder 14 and the holder now has the access hole 32 through which the clamping rod 22 can be actuated from outside the holder 14 and through it. In the Fig. 4 to 7b the access hole 32 is provided in a wall of the bracket 14, in Fig. 8 the access hole 32 is inserted into the back of the holder 14.

[0052] In the exemplary embodiment according to the Fig. From 4 to 7b, the access hole 32 extends radially in direction R perpendicular to the axial direction A, and the holder 14 has a gearbox with a transverse pin 34, which is seated in the access hole 32, and with an axial pin 40, which is connected to the clamping rod 22. The gearbox is designed such that actuation of the transverse pin 34 by means of the tool drives the axial pin 40 and ultimately also the clamping rod 22, thereby securing or releasing the cutting insert 8. The axial pin 40 and the clamping rod 22 are either manufactured as a single piece (monolithic) or as two separate components. In the latter case, the axial pin 40 and the clamping rod 22 are suitably connected to each other, e.g., via appropriate plug-in or engagement contours.

[0053] The transverse pin 34 extends radially in direction R and not directly towards the longitudinal axis L, but laterally past it. The gearbox is implemented, for example, as a worm gear, where the transverse pin 34 has a worm thread and the axial pin 40 has a suitably designed toothing to interact with the transverse pin 34. However, other types of gearboxes are also possible.

[0054] In general, the transverse pin 34 and the clamping rod 22 (and optionally additionally with the axial pin 40) together form a mechanism for fastening and releasing the cutting insert 8. In the section above concerning the Fig. In the embodiment described in sections 1 to 3b, with the transverse pin 34 in the rear end 26 of the working section 20 or in the shaft 12, this mechanism is fully integrated into the rotary tool 4. In the embodiments of Fig. In contrast, in sections 4 to 8, the mechanism is partially integrated into the holder 14, so that the mechanism is formed by the combination of the rotary tool 4 and the holder 14. The clamping rod 22 remains part of the rotary tool 4, but its actuation is now effected via the access hole 32 and the transverse pin 34 (and, if applicable, the axial pin 40) of the holder 14.

[0055] The explanations regarding the access hole 32, the gear mechanism and the transverse pin 34 in connection with the design of the Fig. Paragraphs 1 to 3b also apply analogously to the design of the Fig. 4 to 8 and vice versa.

[0056] In the exemplary embodiments according to the Fig. From 4 to 8, the clamping rod 22 protrudes from the shaft 12 at the rear and in the axial direction A. This is particularly useful in the Fig. 5 and Fig. 8 can be seen. The clamping rod 22 is therefore longer than the body 6. In the clamped state, the clamping rod 22 extends into the holder 14 and can then be actuated from there, either directly with the tool or indirectly via the cross pin 34 and, if necessary, the additional axial pin 40.

[0057] As an alternative to an access hole 32 of the bracket 14 in radial direction R as in the Fig. Figures 4 to 7b also show a design as in Fig. 8 is possible, in which the access hole 32 extends along the longitudinal axis L. Actuation using the tool then takes place along the longitudinal axis L; the clamping rod 22 has a corresponding tool engagement at its rear end for this purpose.

[0058] In a method for attaching or detaching, specifically for changing, the cutting insert 8 in a device 2 as described above, the cutting insert 8 is detached or attached, specifically changed, while the rotary tool 4 is clamped in the holder 14, e.g., fully automatically by means of a robot (not explicitly shown). Manual intervention is not required. This also enables automatic indexing of cutting inserts 8 for multiple applications. In an embodiment (not explicitly shown), this is combined with a pre-setter functionality.

Claims

[1] Device (2) comprising a rotary tool (4), a. wherein the rotary tool (4) extends along a longitudinal axis (L) and in an axial direction (A), b. wherein the rotary tool (4) comprises a body (6), a cutting insert (8) and a clamping rod (22), c. wherein the body (6) has a shaft (12) on the rear side for clamping into a holder (14), d. wherein the clamping rod (22) extends through the body (6) in the axial direction (A), e. wherein the clamping rod (22) is designed at the front for fastening the cutting insert (8), f. wherein the clamping rod (22) extends towards the rear in the direction of the shaft (12) and can be actuated by means of a tool to attach or detach the cutting insert (8) from the body (6), g. wherein this has an access hole (32) which is arranged such that the clamping rod (22) can be actuated while the rotary tool (4) is clamped in the holder (14), characterized by , h. that the rotary tool (4) is designed such that when the clamping rod (22) is actuated, it is rotated and thereby the cutting insert (8) is fastened or loosened. [2] Device according to claim 1, wherein it has a transverse pin (34) which forms a gear with the clamping rod (22) which is designed such that by actuating the transverse pin (34) by means of the tool the clamping rod (22) is actuated and thereby the cutting insert (8) is fastened or released, wherein the access hole (32) is formed in the shaft (12) or in a rear end (26) of a working section (20) of the rotary tool (4) and the transverse pin (34) is seated in the access hole (32). [3] Device (2) according to claim 2, wherein the clamping rod (22) has a thickening (36) on its rear side, with an inclined attack surface (38), wherein the transverse pin (34) interacts with the contact surface (38) in such a way that when the transverse pin (34) is actuated, the clamping rod (22) is driven. [4] Device (2) according to claim 2 or 3, wherein the access hole (32) is arranged at an angle (W) of not more than 60° relative to the longitudinal axis (L). [5] Device (2) according to one of claims 2 to 4, wherein the transverse pin (34) extends along a pin axis (S) and can be actuated either by an axial movement in the direction of the pin axis (S) or by a rotation about the pin axis (S). [6] Device (2) according to claim 1, wherein this has a holder (14) into which the rotary tool (4) can be clamped, so that in a clamped state the shaft (12) is clamped in the holder (14), wherein the bracket (14) has the access hole (32) through which the clamping rod (22) can be operated. [7] Device (2) according to claim 6, wherein the access hole (32) extends in a radial direction (R) perpendicular to the axial direction (A), wherein the holder (14) has a gearbox, with a transverse pin (34) which is seated in the access hole (34) and with an axial pin (40) which is connected to the clamping rod (22), wherein the gearbox is designed such that by actuating the transverse pin (34) by means of the tool the axial pin (40) and thus also the clamping rod (22) are driven and thereby the cutting insert (8) is fastened or released. [8] Device (2) according to claim 6 or 7, wherein the clamping rod (22) extends out of the shaft (12) at the rear and in the axial direction (A). [9] Device (2) according to claim 6, wherein the access hole (32) extends along the longitudinal axis (L). [10] Method for attaching or detaching a cutting insert (8) in a device (2) according to any one of claims 1 to 9, wherein the cutting insert (8) is detached or attached while the rotary tool (4) is clamped in the holder (14).

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