TOOL PART FOR CONNECTING TO A TOOL COUNTER-PART, TOOL COUNTER-PART FOR CONNECTING TO A TOOL PART, AND TOOL

Abstract

The invention relates to a tool part adapted to be connected to a tool counterpart, wherein the tool part comprises a centering portion and an axial stop, and wherein the tool part comprises a plug-rotation portion adapted to cooperate with a plug-rotation counterpart portion of the tool counterpart to connect the tool part to the tool counterpart.

Claims

1. Tool part adapted to be connected to a tool counterpart, wherein the tool part comprises a centering portion and an axial stop, and wherein the tool part comprises a plug-rotation portion adapted to cooperate with a plug-rotation counterpart portion of the tool counterpart to connect the tool part to the tool counterpart.

2. Tool part according to claim 1, wherein the plug-rotation portion has at least one clamping ramp running along a helical section line.

3. Tool part according to claim 1, wherein the plug-rotation portion has two clamping ramps wherein the two clamping ramps preferably are arranged in identical axial position to one another.

4. Tool part according to claim 1, wherein the at least one clamping ramp extends by at least 90° to at most 180°, preferably by at least 95° to at most 120°, about a longitudinal axis (L) of the tool part at the plug-rotation portion.

5. Tool part according to claim 1, wherein the plug-rotation portion comprises at least one insertion surface adapted to cooperate with an insertion counter surface of the tool counterpart to allow insertion of the tool part into the tool counterpart only in at least one determined angular position about a longitudinal axis.

6. Tool part according to claim 1, wherein the plug-rotation portion adjoins the centering portion in an axial direction.

7. Tool part according to claim 1, wherein the centering portion has an outer cone, and/or in that the axial stop is configured as an axial annular surface which engages around the centering portion.

8. Tool part according to claim 1, wherein the tool part has a machining portion with at least one cutting edge.

9. Tool counterpart adapted to be connected to a tool part according to one claim 1, comprising a centering counter-portion and an axial counterstop, wherein the tool counterpart comprises a plug-rotation counterpart portion adapted to cooperate with a plug-rotation portion of the tool part to connect the tool counterpart to the tool part.

10. Tool counterpart according to claim 9, wherein the plug-rotation counterpart portion has at least one clamping projection which is arranged to cooperate with at least one clamping ramp of the plug-rotation portion (9) of the tool part, in such a way, that the tool part is displaced in a direction of the tool counterpart when a relative rotation is effected between the tool part and the tool counterpart, in particular between the at least one clamping projection and the at least one clamping ramp.

11. Tool counterpart according to claim 9, wherein the centering counter-portion has an inner cone, and/or in that the axial counterstop is configured as an axial annular counter surface which engages around the centering counter-portion.

12. Tool counterpart according to claim 1, wherein the tool counterpart comprises a shank portion preferably adapted for connecting the tool counterpart to a machine tool.

13. Tool comprising a tool part according to claim 1 and the tool counterpart, the tool counterpart comprising a centering counter-portion and an axial counterstop, wherein the tool counterpart comprises a plug-rotation counterpart portion adapted to cooperate with the plug-rotation portion of the tool part to connect the tool counterpart to the tool part.

14. Tool according to claim 13, wherein the plug-rotation counterpart portion has at least one clamping projection which is arranged to cooperate with at least one clamping ramp of the plug-rotation portion (9) of the tool part in such a way, that the tool part is displaced in a direction of the tool counterpart when a relative rotation is effected between the tool part and the tool counterpart, in particular between the at least one clamping projection and the at least one clamping ramp.

15. Tool according to claim 13, wherein the centering counter-portion has an inner cone, and/or in that the axial counterstop is configured as an axial annular counter surface which engages around the centering counter-portion.

16. Tool according to claim 13, wherein the tool counterpart comprises a shank portion preferably adapted for connecting the tool counterpart to a machine tool.

Description

[0056] The invention is explained in more detail below with reference to the drawing. Thereby show:

[0057] FIG. 1 a representation of an embodiment of a tool part;

[0058] FIG. 2 a representation of an embodiment of a tool counterpart;

[0059] FIG. 3 a detailed representation of the tool counterpart according to FIG. 2, and

[0060] FIG. 4 the tool part according to FIG. 1 in the connected state with the tool counterpart according to FIG. 2.

[0061] FIG. 1 shows a schematic representation of an embodiment of a tool part 1 which is arranged to be connected to an embodiment of a tool counterpart 3 shown in FIG. 2. With reference to FIG. 1, the tool part 1 has a centering portion 5 and an axial stop 7. In addition, the tool part 1 has a plug-rotation portion 9 which is adapted to cooperate with a plug-rotation counterpart portion 11 of the tool counterpart 3, again shown in FIG. 2, in order to connect the tool part 1 to the tool counterpart 3. The plug-rotation portion 9 and the plug-rotation counterpart portion 11 together form in particular a plug-rotation mechanism, preferably a bayonet lock. The tool part 1 is connected to the tool counterpart 3 by first performing a plug movement in the direction of a longitudinal axis L, that is in the axial direction, and then a rotation movement follows, during which the tool part 1 is rotated relative to the tool counterpart 3, whereby a fixing of the tool part 1 to the tool counterpart 3 is achieved. The plug path is thereby longer, preferably much longer, than an axial displacement path along the longitudinal direction L, also referred to as an axial rotation path, which is covered from the first start of a rotation movement of the plug-rotation mechanism during the rotation movement to the axial stop of the tool part 1 on the tool counterpart 3 and thus to the end of the fixation of the tool part 1 on the tool counterpart 3.

[0062] In this way, a very compact, easy-to-use, component-saving and functionally reliable solution is provided for connecting the tool part 1 to the tool counterpart 3, which is also short in the axial direction.

[0063] The plug-rotation portion 9 preferably has at least one clamping ramp 13, in this case two clamping ramps 13, running along a helical section line—around the longitudinal axis L. The two clamping ramps 13 are preferably arranged in an identical axial position, wherein, in particular, their starting and end points each are arranged at the same axial height—as seen in the direction of the longitudinal axis L. The two clamping ramps 13 are preferably arranged diametrically opposite each other, in particular offset from each other in the circumferential direction by approximately 180°, preferably by 180°.

[0064] The clamping ramps 13 each extend preferably by at least 90° to at most 180°, preferably by at least 95° to at most 120°, in the circumferential direction about the longitudinal axis L.

[0065] Preferably, the plug-rotation portion 9 adjoins the centering portion 5 in the axial direction, i.e. in the direction of the longitudinal axis L. In particular, the plug-rotation portion 9 is preferably configured as a clamping extension.

[0066] The plug-rotation portion 9 preferably has at least one insertion surface 15 which is adapted to cooperate with an insertion counter surface 17 of the tool counterpart 3—compare FIG. 2—in order to permit insertion of the tool part 1 into the tool counterpart 3 only in at least one specific angular position, preferably in at most one or in at most two specific angular positions about the longitudinal axis L.

[0067] Preferably, two such insertion surfaces 15 are provided, wherein in FIG. 1 only one of the insertion surfaces 15 faces the viewer and is therefore shown. The other insertion surface 15 is preferably formed or arranged diametrically opposite on the plug-rotation portion 9, so that it is hidden from the viewer.

[0068] Accordingly, the tool counterpart 3 also preferably has two insertion counter surfaces 17.

[0069] The centering portion 5 is preferably configured as an outer cone 19. The axial stop 7 is preferably configured as an axial annular surface 21 which embraces the centering portion 5 along a closed circumferential line.

[0070] The centering portion 5 is configured here in particular as a short cone. The axial stop 7 is configured in particular as a flat surface.

[0071] The tool part 1 preferably has a machining portion 23, which in turn preferably has at least one cutting edge 25, in particular at least one geometrically defined cutting edge 25, preferably a plurality of geometrically defined cutting edges 25. The machining portion 23 is thereby arranged—adjoining the centering portion 5—opposite the plug-rotation portion 9, so that the centering portion 5—seen along the longitudinal axis L—is arranged between the machining portion 23 and the plug-rotation portion 9.

[0072] The tool part 1 is configured here in particular as a machining head, especially preferably as a milling head. The cutting edge 25 can be configured as a soldered-in cutting edge, an inserted cutting edge, or can also be formed in one piece and in particular in one material with the machining portion 23. The tool part 1 can also be configured as a drill, reamer or reaming tool, or in another suitable manner.

[0073] FIG. 2 shows a representation of an embodiment of the tool counterpart 3. Identical and functionally identical elements are provided with the same reference signs in all figures, so that reference is made to the preceding description in each case.

[0074] The tool counterpart 3 according to FIG. 2 is shown partially cut in the area of its connection point to the tool part 1.

[0075] In particular, the tool counterpart 3 has a centering counter-portion 27 adapted to cooperate with the centering portion 5 and an axial counterstop 29 adapted to cooperate with the axial stop 7. In addition, the tool counterpart 3 has the plug-rotation counterpart portion 11.

[0076] This in turn has at least one clamping projection 31, which is arranged to cooperate with the at least one clamping ramp 13 in such a way that the tool part 1 is urged against the tool counterpart 3, in particular drawn into the tool counterpart 3 and ultimately clamped to the tool counterpart 3 when the tool part 1 is rotated relative to the tool counterpart 3, in particular when the at least one clamping projection 31 runs on the at least one clamping ramp 13. In the embodiment shown here, two clamping projections 31 are provided which are diametrically opposite each other in particular.

[0077] The centering counter-portion 27 is preferably configured here as an inner cone 33, which is preferably more elastic than the outer cone 19, so that the inner cone 33, in particular a wall of the inner cone 33, is widened at least in certain areas when the outer cone 19 is drawn into the inner cone 33 by the plug-rotation mechanism.

[0078] The axial counterstop 29 is configured here in particular as an axial annular counter surface 35, which in particular engages around the inner cone 33 along a closed circumferential line. In the mutually clamped state of the tool part 1 with the tool counterpart 3, the axial annular surface 21 preferably lies fully and firmly against the axial annular counter surface 35.

[0079] Overall, the outer cone 19 and the inner cone 33 together effect radial positioning of the tool part 1 relative to the tool counterpart 3, wherein the axial annular surface 21 interacts with the axial annular counter surface 35 to define an axial relative position between the tool part 1 and the tool counterpart 3 when they are clamped together.

[0080] The tool counterpart 3 further comprises a shank portion 37 which is adapted for connection to a machine tool, in particular to a spindle of a machine tool. The shank portion 37 preferably has a hollow shank taper 39.

[0081] FIG. 3 shows a detailed representation of the tool counterpart 3 according to FIG. 2, in which one of the clamping projections 31 is clearly visible, as well as one of the insertion counter surfaces 17, the inner cone 33 and the annular counter surface 35.

[0082] FIG. 4 shows a detailed representation of a tool 41, which comprises the tool part 1 and the tool counterpart 3 in an interconnected state, wherein the tool 41 preferably comprises the tool part 1 and the tool counterpart 3.

[0083] Only a detail of the tool counterpart 3 is shown here in longitudinal sectional view, while the tool part 1 is shown uncut in the tool counterpart 3 or connected to the tool counterpart 3. For clamping the tool part 1 to the tool counterpart 3, the plug-rotation portion 9 is preferably first inserted axially into the plug-rotation counterpart portion 11. In this case, the insertion surfaces 15 in interaction with the insertion counter surfaces 17 define an angular position about the longitudinal axis L for axial insertion or insertion. If the clamping ramps 13 are arranged at the level of the clamping projections 31, the tool part 1 is preferably rotated relative to the tool counterpart 3 by approximately 90°, preferably slightly more than 90°, in the clamping direction, wherein the clamping projections 31 run on the clamping ramps 13—or vice versa—and wherein the tool part 1, in particular the outer cone 19, is drawn deeper into the tool counterpart 3, in particular into the inner cone 33, in particular until the annular surface 21 abuts against the annular counter surface 35. In this process, the inner cone 33 is preferably widened at least in some areas, in particular slightly, so that the result is an overdetermination and thus a highly accurate and stable fixing of the tool part 1 to the tool counterpart 3.

[0084] Overall, this provides a low-cost, short-barrel, precise, stable, easy-to-use, and low-component way to connect the tool part 1 to the tool counterpart 3.