Indexing methods for machining tools and cutting tools

Abstract

The present invention relates to a machining tool (1), comprising: a tool carrier (2) having at least one seat (3) thereon for receiving a replaceable, indexable cutting tool (4); and a fastening screw (5) for securing the cutting tool (4) to the seat (3), the fastening screw (5) having a head (50) for supporting the cutting tool (4) and a shank (51) at least partially provided with external threads (52). The seat (3) has a contact surface (30) for supporting the lower side (40) of the cutting tool (4) and at least one transverse support surface (31) for supporting the side side (41) of the cutting tool (4). The contact surface (30) has a through hole (6) through which the shank (51) of the fastening screw (5) passes. A clamping element (7) is arranged on the tool carrier (2) behind the contact surface (30) of the seat (3). The clamping element (7) has an internal thread (72) that interacts with the external thread (52) of the fastening screw (5). The fastening screw (5) and the clamping element (7) can move together in the displacement direction (V).

Description

Technical Field

[0001] This invention relates to a machining tool and a method for indexing a cutting tool. Background Technology

[0002] Especially in the case of machining metallic materials, machining tools are typically used. In this case, the cutting edge engaging the material to be machined is configured on a replaceable cutting tool made of a hard and wear-resistant material, such as, in particular, cemented carbide, cermet, or cutting ceramic, and is releasably fixed to a tool carrier made of a harder material, such as tool steel. Here, the cutting tool is typically configured as a so-called indexable cutting tool, which has multiple individually usable cutting edges that can be smoothly used in succession when the previous cutting edge wears out. Here, the cutting edges are typically arranged in such a way that the cutting tool has a certain symmetry, such that indexing or further switching is performed by rotating the cutting tool by a predetermined angle range about its axis of symmetry to move the next cutting edge to the working position.

[0003] WO2017 / 143368A1 describes a cutting tool for peeling bars with a polygonal basic shape. In this case, a total of six sequentially usable cutting edges are arranged in a transition section from the top to the side, allowing for indexing or further switching to the next cutting edge by rotating 60° (=360° / 6) about the axis of symmetry. The cutting tool is configured to be received in a seat within a bar peeling cylinder, which serves as a tool carrier, and is secured by a fastening screw. The head of the fastening screw is supported on the cutting tool, and the shank of the fastening screw has an external thread that interacts with the internal thread of a threaded hole in the seat within the bar peeling cylinder. To index the cutting tool, the fastening screw is completely removed, the cutting tool is rotated 60° in the seat, and then the shank of the fastening screw is again guided through the through hole in the cutting tool, and its external thread is screwed into the internal thread of the threaded hole. Summary of the Invention

[0004] The object of this invention is to provide an improved machining tool and an improved method for indexing cutting tools, which in particular makes indexing simpler and more time-saving.

[0005] This objective is achieved by the machining tool as described in claim 1. Advantageous improvements are specifically described in the dependent claims.

[0006] The machining tool has a tool carrier on which at least one seat is disposed for receiving a replaceable, indexable cutting tool, and a fastening screw for securing the cutting tool to the seat. The fastening screw has a head for supporting the cutting tool and a shank at least partially provided with external threads. The seat has a contact surface for supporting the underside of the cutting tool and at least one transverse support surface for supporting the side of the cutting tool. A through hole is disposed in the contact surface through which the shank of the fastening screw passes. A clamping element is disposed on the tool carrier behind the contact surface of the seat, and the clamping element has an internal thread that interacts with the external threads of the fastening screw. The fastening screw and the clamping element can be displaced together in the direction of displacement.

[0007] Because a clamping element interacts with the fastening screw, and the fastening screw and clamping element can be displaced together in the displacement direction, the side of the cutting tool can be removed from the transverse support surface. This removal is achieved by slightly loosening the screw connection and by displacing the fastening screw and clamping element together with the cutting tool secured by the fastening screw, allowing the cutting tool to be indexed by rotating about the screw axis of the fastening screw without completely removing the fastening screw. Therefore, indexing can be performed in a very simple and quick manner, and the cutting tool is secured during indexing to prevent it from falling out. Here, the slight loosening of the screw connection requires only a relatively small rotation of the fastening screw about its screw axis. The underside of the cutting tool can be supported, for example, directly on the contact surface, or indirectly, for example, by a washer arranged between the underside of the cutting tool and the contact surface. The transverse support surface can preferably extend perpendicularly to the contact surface.

[0008] According to one improvement, the tool carrier also has a stop that restricts the joint displacement of the fastening screw and the clamping element. In this case, particularly simple operation is possible, where displacement can be reduced to the extent required for indexing. The stop can be formed, for example, by a through-hole restricting the movement of the fastening screw on one side, or by a boundary wall of a recess that receives the clamping element and restricts its movement.

[0009] According to one improvement, the displacement direction has a component perpendicular to the transverse support surface. In this case, the cutting tool can be fully removed from the transverse support surface by a small displacement, thereby achieving indexing. Alternatively, the displacement direction can also have a component parallel to the transverse support surface.

[0010] According to one improvement, the seat has at least one additional lateral support surface for supporting the other side of the cutting tool. In this case, the cutting tool can be held on the seat in a particularly reliable manner, even with a forced locking mechanism, thereby preventing accidental loosening of the screw connection between the fastening screw and the clamping element due to forces generated during machining. Here, the additional lateral support surface preferably extends in a plane different from the plane extending from the first lateral support surface. The additional lateral support surface may preferably extend perpendicularly to the contact surface.

[0011] According to one improvement, the displacement direction has a component perpendicular to the other transverse support surface. In this case, the cutting tool can also be fully removed from the other transverse support surface by a small displacement, thereby achieving indexing.

[0012] If the transverse support surface and another transverse support surface form a seat side interior angle (α) of less than 90° in a direction perpendicular to the contact surface, the cutting tool can be held on the seat in a particularly reliable manner even with a forced locking component.

[0013] According to one improvement, the through-hole is configured as a slot with an elongated cross-sectional shape, and the longitudinal axis of this elongated cross-section extends along the displacement direction. In this case, the reduction in effective contact area caused by the through-hole remains small. Furthermore, in this case, the displacement direction can be defined by the shape of the through-hole. Different cross-sectional shapes of the slot are possible, for example, a generally rectangular basic shape with curved short sides, etc.

[0014] According to one improvement, the clamping element is received in a rear recess of the tool carrier. In this case, the direction of displacement and the range of permissible displacement can be easily defined by the shape of the recess. Furthermore, in the case of an actuated fastening screw, the shape of the recess can also easily achieve anti-rotation fixation of the clamping element. The clamping element is preferably held in the recess such that it cannot rotate and can move in the direction of displacement.

[0015] According to one improvement, the machining tool is a bar stripping cylinder for stripping bar stock. Here, the machining tool may preferably have at least two seats for receiving replaceable cutting tools.

[0016] According to one improvement, the machining tool has a replaceable, indexable cutting tool arranged on a base.

[0017] If the cutting tool has a through hole with a cross-section smaller than the head of the fastening screw, the cutting tool is particularly reliably secured during indexing to prevent it from falling out.

[0018] This objective is also achieved by the indexing method for cutting tools as described in claim 14. Advantageous improvements are specifically described in the dependent claims.

[0019] Furthermore, a method for indexing a cutting tool on a holder of a machining tool is also disclosed. The machining tool has a fastening screw for securing the cutting tool to the holder, the fastening screw having a head for supporting the cutting tool and a shank at least partially provided with external threads. The holder has a contact surface for supporting the underside of the cutting tool and at least one transverse support surface for supporting the side of the cutting tool. The shank of the fastening screw engages with the contact surface through a through-hole, and the external threads interact with internal threads in a clamping element movably arranged on the rear side of the contact surface. The method comprises the following steps:

[0020] - Loosen the threaded connection between the external thread of the fastening screw and the internal thread of the clamping element, but do not completely release the fastening screw from the clamping element;

[0021] - The fastening screw, clamping element, and replaceable and indexable cutting tool held by the fastening screw are moved together along the displacement direction, so that the cutting tool is not supported on the lateral support surface.

[0022] - The cutting tool is indexed by rotating it within a predetermined angle range around the screw axis of the fastening screw;

[0023] - The fastening screws, clamping elements, and cutting tool are moved together toward the transverse support surface, thereby allowing the cutting tool to be supported laterally on the transverse support surface; and

[0024] - Tighten the threaded connection between the external thread of the fastening screw and the internal thread of the clamping element to securely clamp the cutting tool onto the holder.

[0025] By loosening the threaded connection, co-location, indexing, and further co-location of the fastening screws, clamping elements, and cutting tool until the cutting tool is supported laterally on the transverse support surface, the cutting tool can be indexed in a particularly simple and rapid manner to move the next cutting edge segment to the working position after one cutting edge segment has worn. Here, the cutting tool remains fixed even during indexing to prevent it from falling off.

[0026] According to one improvement, the common displacement occurs in the displacement direction, which has a directional component perpendicular to the transverse support surface. In this case, only a small displacement distance is required to achieve the rotation.

[0027] According to one improvement, the clamping element is held in such a way that it cannot rotate on the machining tool. This can be achieved, for example, by forcibly locking the clamping element into a recess in the machining tool. A particularly simple and comfortable indexing can be achieved through this non-rotational arrangement.

[0028] According to one improvement, during co-displacement, the fastening screw and the clamping element are guided in the machining tool along the displacement direction through through holes and / or recesses for the clamping element. This can be achieved, for example, by configuring the through holes as slots or by shaping the recesses so that the clamping element is guided therein in a track-like manner. In this case, indexing can be performed in a particularly comfortable manner. Attached Figure Description

[0029] Further advantages and conveniences of the present invention are based on the following description of exemplary embodiments with reference to the accompanying drawings, wherein:

[0030] Figure 1 A perspective view of a machining tool according to a first embodiment is shown.

[0031] Figure 2 This diagram shows a cross-sectional view of the machining tool in the seat area of ​​a replaceable, indexable cutting tool, along the lower... Figure 5 The line II-II is cut off, but has a fastening screw.

[0032] Figure 3 A partial schematic diagram of the tool holder area without cutting tools is shown in plan view.

[0033] Figure 4 A schematic diagram of the tool carrier area on the rear side of the seat is shown.

[0034] Figure 5 A schematic diagram of the tool carrier area on the rear side of the housing is shown, which has a replaceable, indexable cutting tool that is received in the housing in the clamping position.

[0035] Figure 6 It shows the corresponding Figure 5 The diagram shows a replaceable, indexable cutting tool in the indexed position.

[0036] Figure 7 A partial schematic diagram of the seat is shown in plan view, which features a replaceable, indexable cutting tool received in the seat in a clamping position.

[0037] Figure 8 It shows the corresponding Figure 7 A partial schematic diagram showing the cutting tool in the indexed position.

[0038] Figure 9A perspective view of a machining tool according to a second embodiment is shown, having a replaceable, indexable cutting tool held thereon in a clamping position.

[0039] Figure 10 A perspective view of a machining tool according to a second embodiment is shown, having a cutting tool in an indexed position.

[0040] Figure 11 A cross-sectional schematic diagram of the seat region according to a variant is shown, in the clamping position.

[0041] Figure 12 A cross-sectional schematic diagram of the seat region according to a variant is shown, in its rotated position.

[0042] Figure 13 A schematic diagram of the tool carrier area on the rear side of the seat according to another variation is shown.

[0043] Figure 14 A schematic diagram of the tool carrier area on the rear side of the seat according to another variation is shown, in its clamping position, and

[0044] Figure 15 It shows Figure 14 A schematic diagram of the intermediate variant, which is in the transposed position. Detailed Implementation

[0045] First Embodiment

[0046] The following will refer to Figures 1 to 8 A first embodiment of a machining tool is described.

[0047] In the first embodiment, the machining tool 1 is configured as a bar stripping cylinder for stripping bar stock. In bar stripping, the surface layer is removed from a generally cylindrical workpiece through machining, resulting in a smaller diameter workpiece. Here, relative movement occurs between the workpiece and the machining tool 1 about the longitudinal axis of the workpiece. For example, the workpiece may rotate about its longitudinal axis, and the machining tool 1 may move radially with a predetermined depth of cut and axially along the longitudinal axis of the workpiece with a predetermined feed rate; alternatively, the workpiece may move relative to the machining tool 1 along its longitudinal axis with a predetermined feed rate without rotating about its longitudinal axis, and the machining tool 1 may move radially with a predetermined depth of cut about the longitudinal axis of the workpiece in a circular trajectory. Here, in bar stripping, multiple machining tools of this type 1 distributed around the circumference of the workpiece to be processed may also be used simultaneously.

[0048] The machining tool 1 has a tool carrier 2, which, in the first embodiment, is provided with two seats 3, 3' for receiving replaceable, indexable cutting tools 4, 4'. The tool carrier 2 may be made of, for example, steel.

[0049] exist Figures 1 to 8 In the specific example shown, the first cutting tool 4 of the replaceable, indexable cutting tools 4 and 4' is designed for roughing the workpiece, while the second cutting tool 4' is designed for subsequent finishing of the workpiece surface produced by the first cutting tool 4. Therefore, during use, the relative movement between the machining tool 1 and the workpiece is such that the second cutting tool 4' is behind the first cutting tool 4 relative to the direction of travel. Here, in the exemplary embodiment, the first cutting tool 4 preferably has a generally hexagonal basic shape. However, it may also have other basic shapes, particularly polygons. The second cutting tool 4' has a generally triangular basic shape. However, the second cutting tool 4' may also have other basic shapes.

[0050] The following will refer to Figures 2 to 8 The area of ​​the first seat 3 and the cutting tool 4 arranged therein are described in more detail.

[0051] Specifically, such as Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the cutting tool 4 has an upper side 43, a lower side 40, and a plurality of side surfaces extending between the upper side 43 and the lower side 40, wherein a first side surface 41 and another side surface 42 are exemplarily labeled in the figures. Here, the cutting edge 44 is configured at least at the transition from the upper side 43 to the side surface, the cutting edge 44 having a plurality of cutting edge segments 45, which can be successively moved to an effective machining position by indexing or further switching, one of these cutting edge segments 45 in Figure 7 The figures are labeled by way of example. In the example shown in the figures, the cutting tool 4 has a generally hexagonal basic shape, with a total of six successively usable cutting edge segments 45 configured at the transition from the upper side 43 to the side. In particular, for example, in the case of different basic shapes of the cutting tool 4, more or fewer than six cutting edge segments 45 may be provided, which can be used successively. The cutting tool has a through hole 46 extending from the upper side 43 to the lower side 40.

[0052] The cutting tool 4 can be configured as a single-sided cutting tool, in which case the cutting edge 44 is provided only at the transition from the upper side 43 to the side. However, it can also be configured as a double-sided cutting tool, in which case another cutting edge is provided at the transition from the lower side 40 to the side.

[0053] The following will refer to Figure 3 The seat 3 on the tool carrier 2 is described in more detail.

[0054] like Figure 3 As shown, the seat 3 has a contact surface 30 configured to support the lower side 40 of the cutting tool 4. Here, the contact surface 30 extends at least primarily in a plane, and to directly support the lower side 40, it can be configured such that the contact surface directly contacts the lower side 40. However, for example, a washer can also be arranged between the lower side 40 of the cutting tool 4 and the contact surface 30, with the lower side 40 indirectly supported on the contact surface 30 via the washer.

[0055] In addition, such as Figure 3 As shown, the seat 3 has a transverse support surface 31 for supporting the side 41 of the cutting tool 4. Here, the transverse support surface 31 preferably extends in a plane perpendicular to the contact surface 30 of the seat 3. The seat 3 also has another transverse support surface 32 for supporting the other side 42 of the cutting tool 4. This other transverse support surface 32 can also preferably extend in a plane perpendicular to the contact surface 30 of the seat 3. Alternatively, for example, the transverse support surface 31 can also extend at an angle different from 90° relative to the contact surface 30, for example, when the side of the cutting tool is not perpendicular to the lower side. In this case, the other transverse support surface 32 can also preferably extend at the same angle different from 90° relative to the contact surface 30.

[0056] like Figure 3 As shown, when viewed perpendicularly to the contact surface 30, the interior angle α between the transverse support surface 31 and the other transverse support surface 32 relative to each other on the seat side is less than 90°. In the embodiment specifically shown in the figures, and where the cutting tool 4 has a generally hexagonal basic shape, the interior angle α can be, for example, about 60°. For cases where the transverse support surface 31 and the other transverse support surface 32 do not extend perpendicularly to the contact surface 30, the interior angle α is measured in a plane parallel to the contact surface 30 between the transverse support surface 31 and the other transverse support surface 32.

[0057] Similarly, Figure 3 As shown, specifically, a through hole 6 is disposed in the contact surface 30 of the seat 3, extending from the contact surface 30 to the rear side of the tool carrier 2 away from the contact surface 30. In the exemplary embodiment specifically shown, the through hole 6 is configured as a slot having an elongated cross-sectional shape. The elongated cross-sectional shape has a longitudinal axis L in a plane parallel to the contact surface 30.

[0058] In addition, a fastening screw 5 is provided to securely fix the cutting tool 4 to the seat 3. The fastening screw 5 extends along the screw axis Z and has a head 50 for supporting the cutting tool 4 and a shank 51 extending from the head 50 along the screw axis Z, specifically as follows: Figure 2As shown. The shank 51 has an external thread 52 at least at its end away from the head 50. The head 50 of the fastening screw 5 has a larger cross-section than the through hole 46 in the cutting tool 4 in a direction perpendicular to the longitudinal axis of the fastening screw 5.

[0059] In particular, from Figure 4 As can be seen from the rear side of the tool carrier 2, the recess 8 is disposed in the tool carrier 2 on the rear side of the contact surface 30. In this embodiment, the recess 8 is configured as an elongated recess, with its longitudinal axis Y extending parallel to the longitudinal axis L of the through hole 6.

[0060] In the exemplary embodiment shown, the recess 8 is configured, for example, as a recess that opens only on the side away from the contact surface 30 and is otherwise closed on the circumferential side. Here, for example, the recess 8 may in particular have an approximately rectangular cross-sectional shape. However, according to a variation, the recess may also be closed, for example, on the side away from the contact surface 30 by a cover.

[0061] The clamping element 7 is arranged in the recess 8, specifically as follows: Figure 2 , Figure 5 and Figure 6 As shown. The clamping element 7 is provided with an internal thread 72 that interacts with the external thread 52 of the fastening screw 5. The fastening screw 5 is guided by the shank 51 through the through hole 46 in the cutting tool 4 and through the through hole 6 in the tool carrier 2, and the external thread 52 of the fastening screw 5 is screwed into the internal thread 72 of the clamping element 7. The head 50 of the fastening screw 5 is supported on the cutting tool 4. Since the cross-section of the head 50 is larger than the cross-section of the through hole 46 of the cutting tool 4, the cutting tool 4 will not fall off even if the fastening screw 5 is not fully tightened. For this purpose, the through hole 46 of the cutting tool 4 can be specially provided with a shape adapted to the lower side of the head 50 in the region near the upper side 43 of the cutting tool 4.

[0062] Here, the clamping element 7 is adapted to the shape of the recess 8 so that it can move along the longitudinal axis Y of the recess in a direction perpendicular to the longitudinal axis Y and perpendicular to the screw axis Z, but its width is adapted to the width of the recess 8 so that it is held in the recess 8. In the direction of the longitudinal axis Y of the recess 8, the clamping element 7 is configured to be shorter than the recess 8 so that the clamping element 7 can be displaced in this direction.

[0063] If the fastening screw 5 is not tightened, the fastening screw 5 and the clamping element 7 can be displaced together in the displacement direction V due to the described configuration, which extends parallel to the longitudinal axis Y of the recess 8. In the embodiment where the through hole 6 is a slot, the displacement direction V is also parallel to the longitudinal axis L of the elongated cross-sectional shape of the through hole 6.

[0064] In order to be able to move in the displacement direction V, the through hole 6 must have a displacement stroke range in the displacement direction V that is at least greater than the diameter of the rod portion 51 of the fastening screw 5.

[0065] In the first embodiment, the possible displacement of the fastening screw 5 and the clamping element 7 in the displacement direction V is limited. In the example specifically shown, the sidewall of the recess 8 forms a stop 81 that limits the displacement of the clamping element 7. Alternatively or otherwise, displacement can also be limited by a stop 61 formed by the sidewall of the through hole 6 for fastening the shank 51 of the screw 5.

[0066] In this embodiment, the displacement direction V has a component perpendicular to the transverse support surface 31 and a component perpendicular to the other transverse support surface 32. Therefore, the displacement direction V extends neither parallel to the transverse support surface 31 nor parallel to the other transverse support surface 32. In the first embodiment, the displacement direction V extends in a section perpendicular to the screw axis Z, particularly along the bisector between the transverse support surface 31 and the other transverse support surface 32.

[0067] The method for indexing the cutting tool 4 on the seat 3 of the machining tool 1 described above will be described in more detail below.

[0068] In, for example, Figure 1 , Figure 2 , Figure 5 and Figure 7 In the clamping position shown, the cutting tool 4 is clamped along the contact surface 30 by the fastening screw 5, and is supported against the transverse support surface 31 on one side 41 and against another transverse support surface 32 on the other side 42. Here, the cutting tool 4 is partially held on the seat 3 in a non-forced manner by the fastening screw 5, and partially held on the seat 3 in a forced locking manner by the transverse support surface 31 and the other transverse support surface 32 to prevent rotation about the screw axis Z.

[0069] To index the cutting tool 4, that is, to move the next cutting edge segment 45 of the cutting edge 44 to the working position, the fastening screw 5 is slightly loosened. This can be achieved, for example, by using a screwdriver that engages with the corresponding (not shown in detail) engagement point on the head 50 of the fastening screw 5. The threaded connection between the external thread 52 of the fastening screw 5 and the internal thread 72 of the clamping element 7 is not completely canceled here, but merely the tightening torque is loosened. Depending on the specific embodiment of the thread, this may require, for example, only one rotation of the fastening screw 5. Here, the non-rotational arrangement of the clamping element 7 in the recess 8 prevents the clamping element 7 from rotating about the screw axis Z.

[0070] The support between the cutting tool 4, the clamping element 7, and the tool carrier 2 in the area therein is released by loosening the threaded connection. In this state, the fastening screw 5, the clamping element 7, and the cutting tool 4 can collectively shift in the displacement direction V. Figure 6 and Figure 8 The indexing position is schematically shown. The cutting tool 4 is secured by the head 50 of the fastening screw 5 to prevent it from falling off. During this movement, the shank 51 of the fastening screw 5 shifts in the through hole 6 along the displacement direction V, while the clamping element 7 shifts in the recess 8 along the displacement direction V.

[0071] Due to the mutually adaptable shapes of the clamping element 7 and the recess 8, the clamping element 7 is guided in a track-like manner within the recess 8. Since the through hole 6 is configured as a slot, the shank 51 of the fastening screw 5 is also guided within the through hole 6.

[0072] Here, movement in the displacement direction V can occur until it is restricted by the stop 61 and / or the stop 81. During this movement, the side 41 of the cutting tool 4 is spaced apart from the transverse support surface 31, and the other side 42 of the cutting tool 4 is spaced apart from the other transverse support surface 32, thereby eliminating the forced locking fixation that prevents the cutting tool 4 from rotating about the screw axis Z.

[0073] In the indexed position, the cutting tool 4 can be rotated about the screw axis Z to index it, that is, to move the next cutting edge 45 to the effective machining position. In the exemplary embodiment shown, where the cutting tool 4 has a generally hexagonal basic shape (with six cutting edges 45 that can be used successively), the cutting tool 4 thus rotates about the screw axis Z by, for example, 60° (=360° / 6) or an integer multiple of 60°. Here, the range of angles required for indexing is generally defined by the variety of rotational symmetry of the cutting tool 4 about the screw axis Z.

[0074] After the cutting tool 4 is rotated within a predetermined angle range and thus rotated, the fastening screw 5, the cutting tool 4, and the clamping element 7 are moved together again. Figure 5 and Figure 7 The clamping position is shown, and in this clamping position, one side 41 (a different side from the previous one) supports against the transverse support surface 31, while another side 42 (a different side from the previous one) supports against another transverse support surface 32. In this position, the cutting tool 4 is again fixed in a forced locking manner to prevent rotation about the screw axis Z.

[0075] By subsequently tightening the threaded connection between the fastening screw 5 and the clamping element 7, the cutting tool 4 is once again clamped and fixed on the seat 3, preventing it from moving together with the fastening screw 5 and the clamping element 7. Here, the non-rotational arrangement of the clamping element 7 and the recess 8 prevents the clamping element from rotating together during the tightening of the fastening screw 5.

[0076] Second Embodiment

[0077] The following will refer to Figure 9 and Figure 10 A second embodiment of the machining tool is briefly described below. Here, to avoid repetition, only the differences from the first embodiment described above will be explained, and the same reference numerals as in the first embodiment will be used.

[0078] According to the second embodiment, the machining tool 1' is a rotary support for turning, in which case the tool carrier 2 has only one seat 3 for receiving a replaceable, indexable cutting tool 4. Here, in the case of the second embodiment, the tool carrier 2 shown by way of example is specifically configured as a known monolithic rotary support.

[0079] Another difference from the first embodiment described above is that, in the second embodiment, the cutting tool 4 is also indirectly supported by a washer 9, which is arranged on the contact surface of the seat 3.

[0080] The other features of the seat 3 and the mechanism for the indexable cutting tool 4 described above are the same as those of the first embodiment described above, and therefore will not be repeated.

[0081] Figure 9 A state of machining tool 1' according to the second embodiment is shown, wherein the cutting tool 4 is held in the clamping position. Figure 10 The image shows a state of machining tool 1', with the cutting tool 4 in the indexed position.

[0082] Various variations

[0083] Although, in the above embodiments, a particularly advantageous through-hole 6 is described as an embodiment of a slot in each case, the through-hole can also have, for example, different cross-sectional shapes, and the direction of displacement can be defined, for example, solely by the guidance of the clamping element 7 in the recess 8. However, it should be noted that the through-hole 6 must have a sufficiently large size compared to the shank 51 of the fastening screw 5 in order to achieve sufficient displacement.

[0084] Although exemplary embodiments of machining tools have been described by way of example, including a bar stripping cylinder for bar stripping and a monolithic rotating support for turning, machining tools can also be configured differently. For example, the application is not necessarily limited to turning, but machining tools for other machining applications are also conceivable. However, particularly in the case of machining tools used for turning, the described mechanism is especially suitable for indexable cutting tools.

[0085] The following will refer to Figure 11 and Figure 12 A variation of an embodiment of a machining tool in the mounting area is briefly described. This variation can be used in combination with the exemplary embodiments described above and various other variations. Figure 11 and Figure 12 The variant shown differs from the embodiment described above in that: i) the cutting tool 4 is configured as a double-sided cutting tool, ii) the recess 8' and the clamping element 7' are also configured to secure the cutting tool 4 in the clamping position by a forced locking member, and iii) the recess 8' is also closed on the rear side by a cover 10. However, it should be noted that these differences i), ii), and iii) can also be used individually or in any desired combination in each case.

[0086] The cover 10 closes the recess 8' on the rear side to prevent dirt from penetrating. In addition, the cover 10 prevents the clamping element 7' from falling off or being lost when the fastening screw 5 is completely removed.

[0087] like Figure 11 and Figure 12 As shown, the recess 8' has an additional ramp-shaped recess 83, which is configured to interact with the lug-shaped protrusion 73 of the clamping element 7'. Here, the recess 83 and the protrusion 73 interact according to the ramp principle, such that during the tightening of the fastening screw 5, the cutting tool 4, the fastening screw 5, and the clamping element 7' are collectively tensioned in the region of the clamping position, as... Figure 11 As shown. Here, the interaction between the protrusion 73 and the recess 83 creates an additional forced locking fixation in the clamping position, so that the fixation in the clamping position is not achieved solely by surface pressure and friction, as in the embodiments described above.

[0088] exist Figure 13 In another variant illustrated schematically, a spring element 11 is additionally provided in this manner, which preloads the clamping element 7 and thus indirectly also preloads the fastening screw 5 and the cutting tool 4 in the direction of the clamping position. This allows for particularly comfortable indexing. Although in Figure 13 The diagram schematically illustrates a helical spring as spring element 11, but spring elements with different configurations that produce preload in the direction of the clamping position can also be used.

[0089] It should be noted that this other variation can also be used in the cases of the two exemplary embodiments described above, and can also be used in combination with the variations detailed above.

[0090] The following will refer to Figure 14 and Figure 15 The schematic diagram briefly illustrates another variation, in which the clamping position provides additional forced locking. This other variation differs from the embodiment described above in that the cross-section of the recess 8 does not have a generally rectangular basic shape, but instead has a clamping portion 8a and a pivoting portion 8b that rotates slightly about the screw axis Z.

[0091] The function of this other variant will now be explained in more detail and briefly. When the clamping element 7 is in Figure 15 At the indexing position shown, the cutting tool ( Figure 14 and Figure 15 (Not shown) can be rotated, as described in the related embodiments above. Furthermore, in this position, the clamping element 7, the fastening screw 5, and the cutting tool 4 can also be displaced in the displacement direction V, as described in the related embodiments above. If the clamping element 7, the fastening screw 5, and the cutting tool 4 are displaced together in the displacement direction V to... Figure 15 In the clamping position shown, the clamping element 7 is first guided along the displacement direction V by the sidewall of the recess 8 until the cutting tool 4 supports the transverse support surface 31 and another transverse support surface 32, as described above. When the fastening screw 5 is tightened, the fastening screw applies a torque M to the clamping element 7, as... Figure 14 The arrows are schematically shown in the diagram. Because the embodiment of clamping portion 8a rotates slightly relative to indexing portion 8b about screw axis Z, clamping element 7 rotates slightly about screw axis Z due to the torque applied by fastening screw 5. Figure 14 The clamping position is shown. Due to this rotation, the clamping element 7 is then fixed in a forced locking manner by the side wall of the clamping portion 8a to prevent displacement in the displacement direction V. Therefore, in addition to the non-forced fastening via the fastening screw 5, the cutting tool 4 is also fixed in the clamping position in a forced locking manner.

[0092] This other variant can also be combined with the above embodiments and various variants as needed.

Claims

1. A machining tool (1, 1') comprising a tool carrier (2) in which at least one seat (3) for receiving an exchangeable, indexable cutting insert (4) is arranged, and having a fastening screw (5) for fastening the cutting insert (4) to the seat (3), the fastening screw (5) having a head (50) for bearing on the cutting insert (4) and a shank (51) provided at least partially with an external thread (52), the seat (3) having a contact surface (30) for bearing on an underside (40) of the cutting insert (4) and at least one lateral bearing surface (31) for bearing on a side face (41) of the cutting insert (4), a through-hole (6) is arranged in the contact surface (30), through which the shank (51) of the fastening screw (5) passes, a clamping element (7) is arranged on the tool carrier (2) on a rear side of the contact surface (30) of the seat (3), in which clamping element (7) an internal thread (72) is arranged which interacts with the external thread (52) of the fastening screw (5), the fastening screw (5) and the clamping element (7) are displaceable together in a displacement direction (V), the cutting insert (4) has a through-hole (46) which has a smaller cross-section than the head (50) of the fastening screw (5), the displacement direction (V) has a direction component which is perpendicular to the lateral bearing surface (31), the seat (3) has at least one further lateral bearing surface (32) for bearing on a further side face (42) of the cutting insert (4), the displacement direction (V) has a direction component which is perpendicular to the further lateral bearing surface (32).

2. The machining tool as claimed in claim 1, the tool carrier (2) further having a stop (61, 81) which limits the joint displacement of the fastening screw (5) and the clamping element (7).

3. The machining tool as claimed in claim 1 or 2, the lateral bearing surface (31) and the further lateral bearing surface (32) enclose a seat-side interior angle (a) < 90° when viewed perpendicularly with respect to the contact surface (30).

4. The machining tool as claimed in claim 1 or 2, the through-hole (6) is arranged as a slot having an elongate cross-sectional shape, and the longitudinal axis (L) of the elongate cross-sectional shape extends in the displacement direction (V).

5. The machining tool as claimed in claim 1 or 2, the clamping element (7) is received in a recess (8) in the rear side of the tool carrier (2).

6. The machining tool as claimed in claim 5, the clamping element (7) is held in the recess (8) such that it cannot be rotated and can be displaced in the displacement direction (V).

7. The machining tool as claimed in claim 1 or 2, the machining tool (1) is a bar peeling cartridge for peeling a bar.

8. Machining tool according to claim 1 or 2, having at least two seatings (3, 3') for receiving exchangeable cutting inserts (4, 4').

9. Machining tool according to claim 1 or 2, having an exchangeable, indexable cutting insert (4) arranged on the seating (3).

10. Method for indexing a cutting insert (4) on a seating (3) of an indexable machining tool (1, 1'), the machining tool (1, 1') having a fastening screw (5) for fixing the cutting insert (4) to the seating (3), the fastening screw (5) having a head (50) for bearing on the cutting insert (4) and a shank (51) provided at least partially with an external thread (52), the seating (3) having a contact face (30) for bearing on an underside of the cutting insert (4) and at least one lateral bearing face (31) for bearing on a lateral face (41) of the cutting insert (4), the shank (51) of the fastening screw (5) being engaged through a through hole (6) to the contact face (30) and the external thread (52) interacting with an internal thread (72) in a clamping element (7) displaceably arranged on a rear side of the contact face (30), the method having the following steps: - loosening the thread connection between the external thread (52) of the fastening screw (5) and the internal thread (72) of the clamping element (7) without completely releasing the fastening screw (5) from the clamping element (7); - jointly displacing the fastening screw (5), the clamping element (7) and an exchangeable, indexable cutting insert (4) held by the fastening screw (5) along a displacement direction (V) such that the cutting insert (4) is not laterally supported on the lateral bearing face (31), the cutting insert (4) having a through hole (46) with a smaller cross section than the head (50) of the fastening screw (5), the displacement direction (V) having a perpendicular directional component relative to the lateral bearing face (31), the seating (3) having at least one further lateral bearing face (32) for bearing on a further lateral face (42) of the cutting insert (4), the displacement direction (V) having a perpendicular directional component relative to the further lateral bearing face (32); - indexing the cutting insert (4) by rotating it around a screw axis (Z) of the fastening screw (5) through a predetermined angular range; - jointly displacing the fastening screw (5), the clamping element (7) and the cutting insert (4) towards the lateral bearing face (31) such that the cutting insert (4) is supported with a lateral face (41) on the lateral bearing face (31); and - tightening the thread connection between the external thread (52) of the fastening screw (5) and the internal thread (72) of the clamping element (7). ​ ​ ​ ​ ​ ​ - tightening the threaded connection between the outer thread (52) of the fastening screw (5) and the inner thread (72) of the clamping element (7), thereby fixing the clamping of the cutting tool (4) on the seat piece (3).

11. The method as claimed in claim 10, the clamping element (7) being held such that it cannot rotate on the machining tool (1).

12. The method as claimed in claim 10 or 11, during the common displacement, the fastening screw (5) and the clamping element (7) being guided in the machining tool in the displacement direction (V) through the through-hole (6) and / or recess (8) for the clamping element (7).

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