Tool head with a base body

Abstract

The invention relates to a tool head (1), comprising a main body (2), a tool holder (3), which is mounted on the main body (2) by means of a positioning stop (6) in order to set a cutting circle diameter, and a clamping element (4), which can be moved in a clamping direction (S) relative to the main body (2), a tool holder (3) for a tool head (1) and a method for assembling and / or maintaining a tool head (5) are also described. In order to align the cutting tool with respect to the cutting circle diameter solely by means of the clamping element and to fix the cutting tool in a frictional and form-fitting manner with respect to the base body, it is proposed that the clamping element (4) and the tool holder (3) have cooperating wedge surfaces for the abutment of the tool holder (3) on the positioning stop (6), the wedge-shaped surface is inclined at an angle of 30-60 degrees relative to the clamping direction.

Description

Technical Field

[0001] This invention relates to a tool head having a base, a tool holder, and a clamping element. The tool holder is supported on the base by a positioning stop to set the cutting circle diameter, and the clamping element is movable relative to the base along a clamping direction. The invention also relates to a tool holder for a tool head and a method for assembling and / or maintaining the tool head. Background Technology

[0002] Document DE 102019111986 B3 describes a cutting tool head having a base and a clamping element for the cutting tool. Here, the cutting tool includes a locating stop for determining the diameter of the cutting circle, and is clamped between the clamping element and the base in a form-fitting and friction-fitting manner. To position the cutting tool on the locating stop, at least one elastic element is provided, which compresses the clamping element and the cutting tool toward the locating stop to determine the diameter of the cutting circle. However, a disadvantage of this structure is that adjusting the position of the cutting tool is relatively laborious, and the correct positioning of the cutting tool, especially after retearing, depends on the restoring characteristics of the elastic element.

[0003] To properly position the cutting tool to determine the cutting circle diameter, it is also recommended (DE 3120962 A1) to install a locating stop in the groove of the base material, which works in conjunction with the corresponding stop on the cutting tool. This also increases the difficulty of positioning the cutting tool and requires a spring element or a separate locating bolt to position the cutting tool on the locating stop. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to calibrate the cutting tool in terms of the cutting circle diameter by means of only the clamping element, starting from the above-mentioned tool head, and fix the cutting tool in a frictional and shape-fitting manner relative to the base.

[0005] The technical problem is solved according to the present invention by having wedge-shaped surfaces that cooperate with the clamping element and the tool holder, for abutting the tool holder against the positioning stop, the wedge-shaped surfaces being inclined at an angle of 30° to 60° relative to the clamping direction. Through these measures, the adjusting force applied by the clamping element along the clamping direction can be transferred to the positioning stop via the mutually sliding wedge-shaped surfaces, thereby abutting the tool holder and the cutting tool together against the positioning stop, while clamping them between the base and the clamping element. Abutting the tool holder and the cutting tool against the positioning stop aligns the tool holder and the cutting tool such that the cutting edge of the cutting tool is located on a predetermined cutting circle diameter. This means that the positioning stop is at least partially opposite to the direction of the cutting circle diameter, and therefore generally also opposite to the pull-out direction of the tool holder. The positioning stop preferably fixes the tool holder in two directions, namely the cutting circle diameter direction and a second direction perpendicular to it and perpendicular to the axis of rotation of the tool head. In this case, if the positioning stop forms a positioning shoulder or positioning step, particularly advantageous design conditions are created. In the context of this invention, the tool holder and the cutting tool mounted thereon can be designed as a single piece or multiple pieces. The angle between the clamping direction and the wedge-shaped surface according to the invention generates a corresponding wedge-shaped action, achieving both a sufficiently high resistance force on the positioning stop and a sufficiently high clamping force to securely fix the tool holder between the base and the clamping element. A particularly advantageous embodiment is that the wedge-shaped surfaces of the tool holder and the clamping element are inclined at an angle of 40° to 50°, preferably 45°, relative to the clamping direction.

[0006] To further improve the positioning of the tool holder, the tool holder can have a corresponding stop that interacts with the positioning stop on the opposite side of the wedge-shaped surface and with the positioning stop of the base. This achieves defined frictional and form engagement on the positioning stop, particularly when the positioning stop functions in multiple directions. In a preferred embodiment, the positioning stop and the corresponding stop have the same cross-section. This means that the opposing stop surfaces of the tool holder and the base are parallel to each other. The positioning stop and / or the corresponding stop can, in particular, each have at least two mutually perpendicular stop surfaces. One stop surface can be parallel to the clamping direction, and the other can be perpendicular to the clamping direction. The corresponding stop also preferably forms a stop step.

[0007] To facilitate controlled movement of the clamping element along the clamping direction and thereby improve operating conditions, especially during maintenance, the clamping element can be supported in the base by a sliding surface extending along the clamping direction. The clamping element can be bounded by the sliding surface in a direction transverse to the clamping direction. In a preferred embodiment, the sliding surface can extend parallel to the clamping direction. Although the clamping direction can in principle extend transverse to the pull-out direction, for example perpendicular to the pull-out direction, particularly advantageous conditions are created when the clamping direction is parallel to the pull-out direction of the tool holder.

[0008] To enable the tool holder to easily abut against the positioning stop, it is recommended that the clamping element have an operating element supported on the base in the opposite direction to the clamping direction. According to these features, when the operating element is actuated, it applies an operating force, causing the clamping element to move in the clamping direction, thereby causing the tool holder, which engages with the clamping element via a wedge-shaped surface, to abut against the positioning stop of the base. Furthermore, the operating element also prevents the clamping element from accidentally detaching from the base in the clamping direction; preferably, the operating element is designed as an axial stop mechanism.

[0009] In this case, by providing the tool holder and, if necessary, the clamping element with through holes for operating the operating element, a design that is as compact as possible is achieved, thereby enabling reliable operation of the operating element during tool head assembly. Here, the pre-positioning of the tool holder can be improved by having the operating tool act as a guide aid when passing through and placing the tool holder, allowing for effective connection of the tool holder to the axis of the operating tool, such as the operating element, via the through holes. Furthermore, to minimize the risk of accidental triggering of the operating element during operation, the clamping element and operating element can be covered by the tool holder in the installed state, allowing operation of the operating element only through the through holes, for example, using the corresponding operating tool. In the installed state, the through holes in the tool holder and clamping element are substantially closed by the operating element, preventing accidental entry of chips and other contaminating particles into the tool holder within the tool head. A design that precisely matches the dimensions of the tool holder and clamping element and mounts them in the tool head with substantially no gaps provides better intrusion protection. In a preferred embodiment, the tool holder at least partially covers the mounting position of the tool holder within the tool head, thus the gap between the tool holder and the tool head in this area extends outward transversely to the clamping direction. Advantageously, both the tool holder and the clamping element contain corresponding through holes, which form a through hole.

[0010] A structurally advantageous condition is that the operating element of the clamping element is a pan head screw, the head of which, together with the groove of the base, forms an axial stop mechanism, and / or the threaded shank of the pan head screw has a tool interface for operating a tool on the end opposite to the head. Therefore, the clamping element preferably includes a threaded hole corresponding to the threaded shank of the pan head screw. To achieve axial locking, at least one head of the pan head screw engages with the base through a groove, such that the clamping element connected to the pan head screw can only move in the clamping direction by operating the operating element, i.e., by applying the tightening torque of the corresponding pan head screw.

[0011] To reduce tool tip material consumption and extend tool life while maintaining high cutting quality, it is recommended that the tool holder be material-jointed to the cutting tool. This prevents the cutting tool from being subjected to clamping forces, as the clamping elements no longer press on the cutting tool but only on the tool holder. The cutting tool is preferably positioned on a corresponding stop of the tool holder or on the side of the tool holder opposite the positioning stop. Material consumption can be reduced, for example, by significantly reducing the size of the cutting tool and the connected tool holder in terms of material volume during material joining. Crucially, the size of the cutting tool must not affect cutting performance. Cutting tools made of, for example, cemented carbide, cemented carbide-bonded polycrystalline diamond, or similar suitable materials are preferably connected to a tool holder, particularly made of steel, by brazing.

[0012] To maintain a predetermined cutting circle diameter in a particularly advantageous manner after the cutting tool needs to be resharpened, the corresponding stop of the tool holder has a machined surface extending transversely to or along the clamping direction for positioning the tool holder along or transversely to the clamping direction. This creates the prerequisite that, while maintaining a predetermined distance between the cutting edge of the cutting tool and the machined surface of the tool holder, the cutting tool can be sharpened, for example, by grinding, and especially by linear milling, which is a simple procedure. For this purpose, for example, in the region of the machined surface of the positioning stop, an amount of material related to the cutting circle diameter is cut from the tool holder, corresponding to the cutting amount of the resharpened cutting tool, also based on the cutting circle diameter. Particularly advantageous conditions are obtained when the machined surface is perpendicular to the clamping direction, which is parallel to the pull-out direction.

[0013] Especially in multi-piece tool kits, such as tool heads for different profiles, after regrinding, in addition to maintaining radial constancy related to the cutting circle diameter, it is also necessary to maintain axial constancy related to the predetermined axial position of the cutting edge of the cutting tool, i.e., parallel to the direction of the tool head's rotation axis. In this context, according to the present invention, during regrinding, it is not necessary to readjust the axial pre-position of the tool holder, thus eliminating the need for cumbersome disassembly and readjustment of the entire tool head, provided that the clamping direction is inclined at an angle of 0° to 90°, preferably 30° to 60°, and especially 45° relative to the direction of the tool head's rotation axis. The corresponding inclination angle can be selected according to the profile requirements. According to these measures, the main extension direction of the cutting edge of the cutting tool is inclined at an angle of 0° to 90°, preferably 30° to 60°, and especially 45° relative to the direction of the tool head's rotation axis.

[0014] An advantageous condition for this structure is that the base of the tool head has a chamfer with a chamfer angle of 0° to 90°, preferably 30° to 60°, and especially 45°, wherein the tool holder is located in the chamfered area. In the context of this invention, the chamfer angle is understood as the chamfer being inclined at 0° to 90°, preferably 30° to 60°, and especially 45° relative to the axis of rotation of the tool head.

[0015] The present invention also relates to a tool holder for a tool head according to the invention. The tool holder has a wedge-shaped surface, a corresponding stop opposite the wedge-shaped surface, and a through hole for operating the operating element. Preferably, the wedge-shaped surface is inclined at an angle of 30° to 60°, more preferably 40° to 50°, and particularly preferably 45° relative to the through axis of the through hole. Particularly advantageous assembly conditions are obtained when the through axis of the through hole is parallel to the clamping direction. Furthermore, other advantageous designs of the tool holder are described above. Thus, the tool holder can be connected to the cutting tool in a material-bonded manner. This allows for the use of different material systems for the cutting tool and the tool holder without requiring complex fixing of the two components. It is also advantageous for regrinding that the tool holder has a machined surface extending transversely to or along the through axis of the through hole for positioning the tool holder in or transversely to the through axis of the through hole.

[0016] The present invention also relates to a method for assembling and / or maintaining a tool head according to the invention, wherein a tool holder is placed within the tool head, and then a clamping element is adjusted along a sliding surface in the clamping direction, thereby causing the tool holder to abut against a positioning stop on the base along a wedge-shaped surface. If re-grinding of the cutting tool is required, the cutting tool is sharpened and the machining surface is ground before placing the tool within the tool head, while maintaining a predetermined distance between the cutting edge of the cutting tool and the machining surface of the tool holder. Attached Figure Description

[0017] The technical solution of the present invention is illustrated by way of example in the accompanying drawings. In the accompanying drawings:

[0018] Figure 1 A perspective view of a first embodiment of the cutter head according to the present invention is shown.

[0019] Figure 2 A large-scale cross-sectional view obtained by cutting along line II-II is shown.

[0020] Figure 3 Showing with Figure 2 Correspondingly, a diagram showing the tool holder already deployed.

[0021] Figure 4 Showing with Figure 2Correspondingly, a diagram showing that the cutting tool has been resharpened and the machining surface of the tool holder has been ground, and

[0022] Figure 5 A slanted view of a cutting head according to another embodiment of the invention is shown. Detailed Implementation

[0023] The tool head 1 according to the invention includes a base 2, preferably made of aluminum, a tool holder 3 supported on the base, and a clamping element 4. The tool head 1 rotates about a rotation axis R. The tool holder 3 is preferably made of steel and is brazed to a cutting tool 5, for example, made of cemented carbide.

[0024] To determine the cutting circle diameter, the tool holder 3 is supported on the base 2 by a positioning stop 6, wherein the clamping element 4 is movable relative to the base 2 along the clamping direction S. Furthermore, the clamping element 4 is supported on the base 2 by a sliding surface 7 extending along the clamping direction S.

[0025] To abut the tool holder 3 against the positioning stop 6, the clamping element 4 and the tool holder 3 have mating wedge-shaped surfaces 8, which are inclined at an angle of 45° relative to the clamping direction S. Thus, the adjusting force applied by the clamping element 4 along the clamping direction S can be directed to the positioning stop 6 through the mutually sliding wedge-shaped surfaces 8, thereby abutting the tool holder 3 with the cutting tool 5 against the positioning stop 6 and clamping it between the base 2 and the clamping element 4. By abutting the tool holder 3 with the cutting tool 5 against the positioning stop 6, the tool holder 3 and the cutting tool 5 can be aligned such that the cutting edge of the cutting tool 5 is located on a predetermined cutting circle diameter. To further simplify positioning, the tool holder 3 also has a corresponding stop 9 opposite to the wedge-shaped surfaces 8 and mating with the positioning stop 6 of the base 2.

[0026] To bring the tool holder 3 against the positioning stop 6, the clamping element 4, supported on the base 2, is pressed against the tool holder 3 along the clamping direction S. An operating element 10 in the form of a pan head screw is provided. The head 11 of the pan head screw, together with the groove 12 of the base 2, forms an axial stop mechanism. Furthermore, the threaded rod 13 has a tool interface 14 on the end opposite to the head 11 for applying or releasing the operating tool (see...). Figure 3 The corresponding tightening torque. Therefore, in this embodiment, the pan head screw can be operated through the through hole 15 located on the clamping element 4 of the tool holder 3.

[0027] To maintain a constant cutting circle diameter in cases where regrinding is required during certain operating intervals, the corresponding stop 9 of the tool holder 3 has a machining surface 16 perpendicular to the clamping direction S, used to position the tool holder 3 in the clamping direction. To regrind the cutting tool 5, first loosen the pan head screw, and then remove the tool holder 3 from the tool head 1 in the pull-out direction A. Before reinserting the tool holder 3 into the tool head 1, sharpen the cutting tool 5 and grind the machining surface 16 while maintaining a predetermined distance x between the cutting edge of the cutting tool 5 and the machining surface 16 of the tool holder 3.

[0028] To avoid the need for readjusting the axial pre-position of the tool holder 3 during resharpening, thus avoiding the time-consuming and laborious disassembly and readjustment of the entire tool head 1, it can be done according to... Figure 5 The exemplary embodiment specifies that the clamping direction S is inclined at 45° relative to the rotation axis R of the tool head 1. Therefore, the main extension direction H of the cutting edge of the cutting tool 5 is also inclined relative to the rotation axis R of the tool head 1. To achieve this inclination, as... Figure 5 As shown, for example, the base 2 of the tool head 1 may be specified to have a chamfer 17 with an inclination angle of 45°, wherein the tool holder 3 is placed in the area of ​​the chamfer 17.

Claims

1. A cutting tool head (1) comprising a base (2), a tool holder (3), and a clamping element (4), wherein the tool holder is supported on the base (2) by a positioning stop (6) for setting a cutting circle diameter, and the clamping element is movable relative to the base (2) in a clamping direction (S), characterized in that, The clamping element (4) and the tool holder (3) have wedge-shaped surfaces that cooperate to make the tool holder (3) abut against the positioning stop (6), and the wedge-shaped surfaces are inclined at an angle of 30° to 60° relative to the clamping direction.

2. The cutting head (1) according to claim 1, characterized in that, The clamping element (4) is supported on the base (2) by a sliding surface (7) extending along the clamping direction (S).

3. The cutting head (1) according to claim 1 or 2, characterized in that, The clamping element (4) has an operating element (10) which is supported on the base (2) in the opposite direction to the clamping direction (S).

4. The cutting head (1) according to claim 3, characterized in that, The operating element (10) of the clamping element (4) is a pan head screw, the head (11) of the pan head screw and the groove (12) of the base (2) together form an axial stop mechanism, and / or the threaded rod (13) of the pan head screw has a tool interface (14) for operating tools on the end side opposite to the head.

5. The cutting head (1) according to any one of claims 1 to 4, characterized in that, The clamping direction (S) is inclined at an angle of 0° to 90° relative to the rotation axis (R) of the cutter head (1).

6. A tool holder (3) for a tool head (1) according to any one of claims 1 to 5, characterized in that, The tool holder is provided with a wedge-shaped surface (8), a corresponding stop (9) opposite to the wedge-shaped surface (8), and a through hole (15) for operating the operating element (10).

7. The tool holder (3) according to claim 6, characterized in that, The tool holder (3) is connected to the cutting tool (5) at a material joint.

8. The tool holder (3) according to claim 6 or 7, characterized in that, The wedge-shaped surface (8) is inclined at an angle of 30° to 60° relative to the through axis of the through hole (15).

9. The tool holder (3) according to any one of claims 6 to 8, characterized in that, The corresponding stop (9) has a machining surface (16) extending transversely to the through axis of the through hole (15) or along the through axis of the through hole (15), for positioning the tool holder (3) along the through axis of the through hole (15) or transversely to the through axis of the through hole (15).

10. A method for assembling and / or maintaining a tool head (5) according to any one of claims 1 to 5, comprising placing a tool holder (3) inside the tool head (1), then adjusting a clamping element (4) along a sliding surface (7) in a clamping direction (S), thereby causing the tool holder (3) to abut against a positioning stop (6) of a base (2) along a wedge-shaped surface (8).

11. The method according to claim 10, characterized in that, Before placing the tool holder (3) inside the tool head (1), while maintaining a preset distance (x) between the cutting edge of the cutting tool (5) and the machining surface (16) of the tool holder (3), the cutting tool (5) is sharpened and the machining surface (16) is ground.

Images