Tool holder arrangement for the fixed connection of a tool holder with a tool

Abstract

Tool holder arrangement for firmly connecting a tool holder to a tool, comprising: - a tool holder (10) comprising two opposite ends, a clamping groove (11), a conical hole (12), and a screw hole (13), wherein the clamping groove (11) is arranged inside the tool holder (10) and has a lower side (111), wherein the conical hole (12) extends from one end of the tool holder (10) to the clamping groove (11) and thus communicates with the clamping groove (11), wherein the hole diameter of the conical hole (12) decreases successively towards the clamping groove (11), wherein the screw hole (13) extends from the lower side (111) of the clamping groove (11) to the other end of the tool holder (10) and is provided with an internal thread (141); and - a tool (20) comprising a connecting part (21), an extension shaft (22), a fastening bore (23) and at least one machining element (27), wherein the connecting part (21) is conical and comprises a supporting end (211) and an insertion end (212), wherein the supporting end (211) and the insertion end (212) are arranged opposite one another, wherein the insertion end (212) is inserted into the conical hole (12), wherein the outer diameter of the connecting part (21) decreases successively from the supporting end (211) to the insertion end (212), wherein the fastening bore (23) extends from the insertion end (212) to the supporting end (211) and is polygonally profiled, wherein the extension shaft (22) protrudes from the supporting end (211) and a machining end facing away from the connecting part (21) (221), wherein the at least one processing element (27) is mounted on the processing end (221); - a fastening element (30) located inside the tool holder (10) and comprising a clamping piece (31) and an insert (33), the clamping piece (31) matching the profile of the clamping groove (11), the clamping piece (31) being block-shaped and having a first surface (311) and a second surface (312), the first and second surfaces (311, 312) facing opposite one another, the outer diameter of the clamping piece (31) being smaller than the diameter of the conical hole (12), the second surface (312) abutting the lower side (111) of the clamping groove (11), the insert (33) being arranged on the first surface (311) of the clamping piece (31) and having a polygonal cross-section, the insert (33) being inserted into the fastening bore (23) and being in positive connection therewith; - a threaded bolt (50) which is pushed through the fastening element (30) and thus screwed into the screw hole (13), wherein the fastening element (30) and the tool holder (10) are connected to one another by means of the threaded bolt (50); and - a closure cap (40) which is connected to the tool holder (10), is supported on the support end (211) and has a through-opening, wherein the extension shaft (22) and the machining element (30) protrude from the through-opening.

Description

[0001] The utility model relates to a machining device, in particular a tool holder arrangement for the fixed connection of a tool holder to a tool, wherein the arrangement enables an increase in machining performance and quality.

[0002] A conventional connection device for firmly connecting a tool holder to a tool comprises a tool holder and a tool, the tool being shank-shaped and having two opposite ends, with a blade disposed at one end of the tool and the other end of the tool being firmly connected to the interior of the tool holder. When a spindle drives the tool holder and the tool for cutting or drilling, the machined workpiece presents strong resistance to the tool holder and the tool, causing the tool holder and the shank-shaped tool to rotate slightly relative to each other.

[0003] As a result of the relative rotation of the tool holder and the shank-shaped tool, machining performance is impaired and the machining quality of the workpiece may even be adversely affected. Therefore, the conventional connection device for firmly connecting a tool holder to a tool needs improvement.

[0004] The utility model is based on the object of providing a tool holder arrangement for the fixed connection of a tool holder to a tool, whereby the arrangement enables an increase in machining performance and quality.

[0005] The object is achieved by a tool holder arrangement for firmly connecting a tool holder to a tool having the features of claim 1. Advantageous embodiments are the subject of the dependent claims.

[0006] The present tool holder arrangement for firmly connecting a tool holder to a tool comprises: - a tool holder comprising two opposite ends, a clamping groove, a tapered hole and a screw hole, wherein the clamping groove is arranged inside the tool holder and has a lower side, wherein the tapered hole extends from one end of the tool holder to the clamping groove and thus communicates with the clamping groove, wherein the hole diameter of the tapered hole decreases successively towards the clamping groove, wherein the screw hole extends from the lower side of the clamping groove to the other end of the tool holder and is provided with an internal thread; - a tool comprising a connecting part, an extension shaft, a fastening bore and at least one machining element, wherein the connecting part is conical and comprises a support end and an insertion end, wherein the support end and the insertion end are arranged opposite one another, wherein the insertion end is inserted into the conical hole, wherein the outer diameter of the connecting part decreases successively from the support end to the insertion end, wherein the fastening bore extends from the insertion end to the support end and is profiled with a multi-edge, wherein the extension shaft protrudes from the support end and has a machining end facing away from the connecting part, wherein the at least one machining element is mounted on the machining end; - a fastening element which is located inside the tool holder and comprises a clamping piece and an insert, wherein the clamping piece matches the clamping groove in terms of profile, wherein the clamping piece is block-shaped and has a first surface and a second surface, wherein the first and the second surface are directed in opposite directions to each other, wherein the outer diameter of the clamping piece is smaller than the hole diameter of the conical hole, wherein the second surface rests on the lower side of the clamping groove, wherein the insert is arranged on the first surface of the clamping piece and has a polygonal cross-section, wherein the insert is inserted into the fastening bore and is in positive connection with the same; - a threaded bolt which is passed through the fastening element and thus screwed into the screw hole, the fastening element and the tool holder being connected to each other by means of the threaded bolt; and - a closure cap connected to the tool holder, supported on the support end and having a through-opening, wherein the extension shaft and the machining element protrude from the through-opening.

[0007] The present tool holder assembly for firmly connecting a tool holder to a tool is characterized by the following: The fastening element is firmly connected to the interior of the tool holder, wherein the insert of the fastening element is inserted into the fastening bore of the tool and is in positive connection with the same, wherein the clamping piece of the fastening element is inserted into the clamping groove of the tool holder and is in positive connection with the same, so that a frictional connection is created between the fastening element, the tool, and the tool holder. This allows the tool to counteract the counterforce during machining and not rotate relative to the tool holder. The present tool holder assembly thus achieves greater performance during machining and further contributes to higher machining quality.

[0008] The utility model is described in detail below using an exemplary embodiment and with reference to the drawings. The drawings show: Fig. 1 a perspective view of a tool holder arrangement for firmly connecting a tool holder to a tool, Fig. 2 an exploded view of the components of the tool holder assembly in Fig. 1, Fig. 3 a perspective view of a fastening element of the tool holder assembly in Fig. 1, Fig. 4 a side and sectional view of the tool holder arrangement in Fig. 1, Fig. 5 a sectional view along the section line AA in Fig. 4, and Fig. 6 a sectional view along the section line BB in Fig. 4.

[0009] The objects, features, and advantages of the present utility model are explained in more detail below with reference to the detailed description of the exemplary embodiment and the accompanying drawings. The utility model is not intended to be limited to the features apparent from the description and the drawings.

[0010] In Fig. 1 to Fig. Figure 4 shows a preferred embodiment of a tool holder assembly for firmly connecting a tool holder to a tool. The tool holder assembly comprises a tool holder 10, a tool 20, a fastening element 30, a closure cap 40, and a threaded bolt 50.

[0011] As in Fig. 1 to Fig. 4, the tool holder 10 comprises two opposite ends, a clamping groove 11, a conical hole 12, a screw hole 13, and a screw portion 14. The clamping groove 11 is arranged inside the tool holder 10 and comprises a lower side 111, wherein the clamping groove 11 has a multi-edged profile. The conical hole 12 is tapered into a circular cone and extends from one end of the tool holder 10 to the clamping groove 11 such that it is connected to the clamping groove 11. The conical hole 12 extends such that its hole diameter decreases successively towards the clamping groove 11. The screw hole 13 extends from the lower side 111 of the clamping groove 11 to the other end of the tool holder 10 and comprises an internal thread. The screw portion 14 and the conical hole 12 are located at one and the same end of the tool holder 10, wherein the screw portion 14 is provided with an internal thread 141.

[0012] As in Fig. 1 to Fig. 4, the tool 20 comprises a connecting part 21, an extension shaft 22, a fastening bore 23, an inflow channel 24, a connecting channel 25 and two machining elements 27. The connecting part 21 is circular conical in shape corresponding to the circular conical profiled conical hole 12 and comprises a support end 211 and an insertion end 212, wherein the support end 211 and the insertion end 212 are arranged opposite one another, wherein the insertion end 212 of the connecting part 21 is inserted into the conical hole 12, wherein the outer diameter of the connecting part 21 decreases successively from the support end 211 to the insertion end 212 of the connecting part 21. The extension shaft 22 is a cylindrical shaft that protrudes from the support end 211 and has a machining end 221 facing away from the connecting part 21.The mounting hole 23 extends from the insertion end 212 to the support end 212 of the connecting part 21 and has a polygonal profile. The inlet channel 24 extends from the bottom of the mounting hole 23 to the machining end 221 of the extension shaft 22. The connecting channel 25 is connected to the inlet channel 24 and extends to the machining end 221 of the extension shaft 22 such that it communicates with the outer part of the machining end 221 of the extension shaft 22. The two machining elements 27 are mounted on the machining end 221 of the extension shaft 22.

[0013] As in Fig. 1 to Fig. 4, the mounting hole 23, the inflow channel 24 and the connecting channel 25 are coaxially connected to each other.

[0014] As in Fig. 1 to Fig. 4, the fastening element 30 is located inside the tool holder 10 and comprises a clamping piece 31, a receptacle 32, an insert 33, and a through-bore 34. The clamping piece 31 is block-shaped and profiled according to the profile of the clamping groove 11 and thus has a polygonal cross-section. The clamping piece 31 has a first surface 311 and a second surface 312 that are directed in opposite directions to one another. The insert 33 is arranged on the first surface 311 of the clamping piece 31 and has a polygonal cross-section corresponding to the profile of the fastening bore 23. The receptacle 32 is arranged inside the fastening element 30 and extends from the insert 33 to the clamping piece 31.The through-bore 34 is arranged in the interior of the fastening element 30 and extends from the bottom of the receptacle 32 to the second surface 312 of the clamping piece 31, wherein the bore diameter of the through-bore 34 is smaller than the clear width of the receptacle 32.

[0015] As in Fig. 1 to Fig. 4, the clamping piece 31 is inserted into the clamping groove 11 such that it sits frictionally in the clamping groove 11 and the second surface 312 of the clamping piece 31 rests against the lower side 111 of the clamping groove 11, so that the fastening element 30 and the tool holder 10 are frictionally connected to one another. The insert 33 is inserted into the fastening bore 23 of the tool 20 such that the tool 20 and the fastening element 30 are frictionally connected to one another. Because the clamping piece and the clamping groove 11 fit together in terms of profile and because the insert 33 and the fastening bore 23 fit together in terms of profile, a frictional connection is established between the fastening element 30, the tool holder 10, and the tool 20.

[0016] As in Fig. 1 to Fig. 4, the outer diameter of the clamping piece 31 of the fastening element 30 is smaller than the hole diameter of the conical hole 12 of the tool holder 10, so that the clamping piece 31 of the fastening element 30 fits smoothly into the clamping groove 11 of the tool holder 10 such that the second surface 312 of the clamping piece 31 abuts the lower side 111 of the clamping groove 11.

[0017] As in Fig. 1 to Fig. As shown in Figure 6, the clamping piece 31 of the fastening element 30 has a hexagonal cross-section, with the clamping groove 11 correspondingly hexagonally profiled so that the clamping piece 31 and the clamping groove 11 fit together in terms of profile. The insert 33 of the fastening element 30 has a hexagonal cross-section, and the fastening bore 23 of the tool 20 is also hexagonally profiled to match the cross-section of the insert 33, so that the insert 33 and the fastening bore 23 fit together in terms of profile. In this way, a frictional connection is established between the fastening element 30, the tool holder 10, and the tool 20.

[0018] As in Fig. 1 to Fig. As shown in Figure 4, the closure cap 40 includes an external thread 41 and a through-opening. By means of the external thread 41, the closure cap 40 is screwed onto the screw portion 14 of the tool holder 10 such that it presses firmly against the support end 211 of the connecting part 21 of the tool 20. The extension shaft 22 and the two machining elements 27 of the tool 20 protrude from the through-opening of the closure cap 40.

[0019] As in Fig. 1 to Fig. 4, the threaded bolt 50 is inserted through the receptacle 32 and the through hole 34 of the fastening element 30 and screwed into the screw hole 13 of the tool holder 10 in order to connect the fastening element 30 and the tool holder 10 to each other.

[0020] Compared to conventional connecting devices for firmly connecting a tool holder to a tool, the present tool holder assembly is advantageous in that the fastening element 30 is provided, which is firmly connected to the interior of the tool holder 10 and has the insert 33 with a polygonal cross-section, and the polygonally profiled fastening bore 23 is arranged at the insertion end 212 of the connecting part 21 of the tool 20. Furthermore, the clamping piece 31 of the fastening element 30 has a polygonal cross-section, and the clamping groove 11 of the tool holder 10 is correspondingly polygonally profiled.The positive engagement between the insert 33 and the mounting hole 23 and the positive engagement between the clamping piece 31 and the clamping groove 11 creates a frictional engagement between the mounting element 30, the tool holder 10, and the tool 20, thereby securing the tool 20 against rotation relative to the tool holder 10. This enables the tool 20 to counteract the counterforce exerted by the workpiece when machining a workpiece. The tool holder arrangement thus achieves greater performance during machining and further contributes to higher machining quality.

[0021] When using the tool holder arrangement, the cross section of the insert 33 of the fastening element 30 and the profile of the fastening bore 23 of the tool 20 are not limited to specific cross sections and profiles, provided that the insert 33 and the fastening bore 23 can be connected to one another in a form-fitting manner. Likewise, the cross section of the clamping piece 31 of the fastening element 30 and the profile of the clamping groove 11 of the tool holder 10 are not limited to specific cross sections and profiles, provided that the clamping piece 31 and the clamping groove 11 can be connected to one another in a form-fitting manner. The cross section and profile can be triangular, square, five-sided, or hexagonal, for example. Furthermore, in the present case, the respective machining element 27 is a blade of a cutting tool for machining.

[0022] Although the present utility model has been described in detail using an exemplary embodiment, it is obvious to those skilled in the art that the utility model is not limited to this exemplary embodiment. Rather, modifications are possible such that individual features can be omitted or different combinations of features can be implemented without exceeding the scope of the appended claims. The disclosure of the present utility model includes all combinations of the individual features presented. List of reference symbols 10 tool holders 11 clamping groove 111 bottom page 12 cone holes 13 screw hole 14 screw section 141 internal thread 20 tools 21 Connecting part 211 Supporting 212 shank end 22 Extension shaft 221 End of processing 23 Mounting hole 24 Inlet channel 25 connecting channel 27 Editing element 30 Fastening element 31 clamping piece 311 first surface 312 second surface 32 recordings 33 deployment 34 through hole 40 cap 41 external thread 50 threaded bolts

Claims

[1] Tool holder arrangement for firmly connecting a tool holder to a tool, comprising: - a tool holder (10) comprising two opposite ends, a clamping groove (11), a conical hole (12), and a screw hole (13), wherein the clamping groove (11) is arranged inside the tool holder (10) and has a lower side (111), wherein the conical hole (12) extends from one end of the tool holder (10) to the clamping groove (11) and thus communicates with the clamping groove (11), wherein the hole diameter of the conical hole (12) decreases successively towards the clamping groove (11), wherein the screw hole (13) extends from the lower side (111) of the clamping groove (11) to the other end of the tool holder (10) and is provided with an internal thread (141); and - a tool (20) comprising a connecting part (21), an extension shaft (22), a fastening bore (23) and at least one machining element (27), wherein the connecting part (21) is conical and comprises a supporting end (211) and an insertion end (212), wherein the supporting end (211) and the insertion end (212) are arranged opposite one another, wherein the insertion end (212) is inserted into the conical hole (12), wherein the outer diameter of the connecting part (21) decreases successively from the supporting end (211) to the insertion end (212), wherein the fastening bore (23) extends from the insertion end (212) to the supporting end (211) and is polygonally profiled, wherein the extension shaft (22) protrudes from the supporting end (211) and a machining end facing away from the connecting part (21) (221), wherein the at least one processing element (27) is mounted on the processing end (221); - a fastening element (30) located inside the tool holder (10) and comprising a clamping piece (31) and an insert (33), the clamping piece (31) matching the profile of the clamping groove (11), the clamping piece (31) being block-shaped and having a first surface (311) and a second surface (312), the first and second surfaces (311, 312) facing opposite one another, the outer diameter of the clamping piece (31) being smaller than the diameter of the conical hole (12), the second surface (312) abutting the lower side (111) of the clamping groove (11), the insert (33) being arranged on the first surface (311) of the clamping piece (31) and having a polygonal cross-section, the insert (33) being inserted into the fastening bore (23) and being in positive connection therewith; - a threaded bolt (50) which is pushed through the fastening element (30) and thus screwed into the screw hole (13), wherein the fastening element (30) and the tool holder (10) are connected to one another by means of the threaded bolt (50); and - a closure cap (40) which is connected to the tool holder (10), is supported on the support end (211) and has a through-opening, wherein the extension shaft (22) and the machining element (30) protrude from the through-opening. [2] Tool holder arrangement according to claim 1, characterized byin that the fastening element (30) comprises a receptacle (32) and a through-bore (34), wherein the receptacle (32) is arranged in the interior of the fastening element (30) and extends from the insert (33) to the clamping piece (31), wherein the through-bore (34) is arranged in the interior of the fastening element (30) and extends from the bottom of the receptacle (32) to the second surface (312) of the clamping piece (31), wherein the threaded bolt (50) is inserted through the receptacle (32) and the through-bore (34). [3] Tool holder arrangement according to claim 2, characterized by that the tool holder (10) comprises a screw portion (14), wherein the screw portion (14) and the conical hole (12) are located at one and the same end of the tool holder (10); and that the closure cap (40) is provided with an external thread (41) and is screwed onto the screw portion (14) by means of the external thread (41). [4] Tool holder arrangement according to claim 3, characterized by in that the tool (20) comprises an inflow channel (24) and a connecting channel (25), wherein the inflow channel (24) extends from the bottom of the fastening bore (23) to the machining end (221) of the extension shaft (22), wherein the connecting channel (25) is connected to the inflow channel (24) and extends to the machining end (221) such that it is in communication with the outer part of the machining end (221). [5] Tool holder arrangement according to claim 4, characterized by that the respective machining element (27) is a blade of a cutting tool. [6] Tool holder arrangement according to claim 5, characterized by that the extension shaft (22) is a cylindrical shaft. [7] Tool holder arrangement according to one of the preceding claims, characterized bythat the clamping piece (31) has a hexagonal cross-section and the clamping groove (11) is hexagonally profiled according to the cross-section of the clamping piece (31). [8] Tool holder arrangement according to one of claims 1 to 6, characterized by that the clamping piece (31) has a pentagonal cross-section and the clamping groove (11) is profiled pentagonally according to the cross-section of the clamping piece (31). [9] Tool holder arrangement according to one of claims 1 to 6, characterized by that the clamping piece (31) has a square cross-section and the clamping groove (11) is profiled squarely according to the cross-section of the clamping piece (31). [10] Tool holder arrangement according to one of claims 1 to 6, characterized bythat the insert (33) has a hexagonal cross-section and the fastening bore (23) is hexagonally profiled corresponding to the cross-section of the insert (33); and that the clamping piece (31) has a hexagonal cross-section and the clamping groove (11) is hexagonally profiled corresponding to the cross-section of the clamping piece (31).

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