TURNING TOOL HOLDER

Abstract

A turning tool holder includes a clamping portion for connection to a tool fitting of a machine tool and a machining portion having a seat for an interchangeable cutting insert. An internal coolant guide in the tool holder supplies coolant to the machining portion and has a first coolant inlet and first coolant outlet laterally of the seat. The first outlet has a bore laterally of the seat extending from a surface of the machining portion for receiving an interchangeable nozzle body with a shank region in the bore and a nozzle outlet region at an angle to the shank region on the machining portion surface. An internal coolant channel extends through the shank and nozzle outlet regions. The shank region has a periphery with a recess receiving a clamping element transverse to a longitudinal axis of the shank region fastening the nozzle body to the turning tool holder.

Claims

1-16. (canceled)

17. A turning tool holder, comprising: a clamping portion for connection to a tool fitting of a machine tool; a machining portion having a seat for receiving an interchangeable cutting insert, said machining portion having a surface; an internal coolant guide formed in the turning tool holder for supplying coolant to said machining portion, said coolant guide having at least one first coolant inlet and at least one first coolant outlet disposed laterally of said seat on said machining portion; said first coolant outlet having a bore disposed laterally of said seat and extending from said surface of said machining portion; an interchangeable nozzle body configured to be inserted in said bore of said first coolant outlet, said interchangeable nozzle body having a shank region inserted into said bore of said first coolant outlet and a nozzle outlet region formed at an angle to said shank region and disposed on said surface of said machining portion; an internal coolant channel extending through said shank region and said nozzle outlet region; said shank region having an outer circumferential surface, a longitudinal axis and a recess formed in said outer circumferential surface; and a clamping element configured to be engaged in said recess transverse to said longitudinal axis of said shank region for fastening said nozzle body to the turning tool holder.

18. The turning tool holder according to claim 17, wherein said clamping element is disposed in a transverse bore connected to and communicating with said bore of said first coolant outlet.

19. The turning tool holder according to claim 18, wherein said transverse bore is a threaded bore with an internal thread interacting with an external thread on said clamping element.

20. The turning tool holder according to claim 17, wherein said recess is a groove annularly encircling said shank region.

21. The turning tool holder according to claim 17, wherein said recess forms a clamping surface running obliquely relative to said longitudinal axis of said shank region, and said clamping element has a wedge-shaped holding surface for clamping said nozzle body against said surface of said machining portion.

22. The turning tool holder according to claim 17, which further comprises a first rotation-prevention element disposed on said surface of said machining portion, and a second rotation-prevention element disposed on a bottom side of said nozzle outlet region, said first rotation-prevention element interacting with said second rotation-prevention element for preventing rotation of said nozzle body about said longitudinal axis of said shank region.

23. The turning tool holder according to claim 22, wherein said first rotation-prevention element is a projection and said second rotation-prevention means is a depression in said bottom side of said nozzle outlet region.

24. The turning tool holder according to claim 17, wherein said first coolant outlet is configured to direct a coolant jet emerging from said nozzle body onto a rake face of a cutting insert disposed on said seat.

25. The turning tool holder according to claim 17, which further comprises an annular sealing element disposed between said outer circumferential surface of said shank region and an inner circumferential surface of said bore.

26. The turning tool holder according to claim 25, wherein said sealing element is disposed on a side of said recess facing away from said nozzle outlet region.

27. The turning tool holder according to claim 17, which further comprises at least one second coolant outlet having a bore formed in said machining portion laterally of said seat and extending from said surface.

28. The turning tool holder according to claim 27, wherein said first coolant outlet and said second coolant outlet are formed to permit said nozzle body to be inserted selectively into said bore of said first coolant outlet or into said bore of said of said second coolant outlet.

29. The turning tool holder according to claim 17, wherein said internal coolant channel formed in said nozzle body is free of abrupt changes in cross section.

30. The turning tool holder according to claim 29, wherein said internal coolant channel extends in a spatially curved manner through said nozzle body.

31. The turning tool holder according to claim 17, wherein said nozzle body is formed of a different material than a remainder of the turning tool holder.

32. A turning tool system, comprising: a turning tool holder according to claim 17; and at least one blind plug configured to be inserted into said bore instead of said nozzle body in order to fluid-tightly close said bore.

Description

[0025] Further advantages and expedient aspects of the invention will become apparent on the basis of the following description of exemplary embodiments with reference to the appended figures, in which:

[0026] FIG. 1: shows a schematic and perspective view of a turning tool holder according to one embodiment, with a mounted nozzle body and a mounted blind plug;

[0027] FIG. 2: shows a schematic side view of the machining portion in the case of the turning tool holder from FIG. 1;

[0028] FIG. 3: shows a schematic and perspective illustration of the nozzle body;

[0029] FIG. 4: shows a schematic side view of the nozzle body;

[0030] FIG. 5: shows a schematic plan view of the machining portion in the case of the turning tool holder from FIG. 1;

[0031] FIG. 6: shows an enlarged illustration of a detail of a section along C-C in FIG. 5;

[0032] FIG. 7: shows a schematic and perspective illustration of the blind plug;

[0033] FIG. 8: shows a schematic side view of the blind plug without a sealing element;

[0034] FIG. 9: shows an enlarged illustration of a detail of a section along B-B in FIG. 5;

[0035] FIG. 10: shows an enlarged illustration of a detail of a section along D-D through the blind plug in FIG. 5;

[0036] FIG. 11: shows a schematic and perspective illustration of the turning tool holder with two mounted nozzle bodies; and

[0037] FIG. 12: shows a schematic plan view of the turning tool holder without a nozzle body and without a blind plug.

[0038] One embodiment of the turning tool holder 1 is described below with reference to FIG. 1 to FIG. 12. In the example specifically illustrated, the turning tool holder 1 is in the form of what is known as a monobloc holder, however it should be taken into consideration that the turning tool holder 1 can also receive other configurations.

[0039] The turning tool holder 1 has a clamping portion 2 for clamping to a tool fitting of a machine tool and a machining portion 3, which is formed in one piece and/or monolithically with the clamping portion 2 and on which is formed a seat 4 for receiving an interchangeable cutting insert 20. The turning tool holder 1 can be formed e.g. from steel or a relatively tough hard metal. Although the specific example shows a realization in which the seat 4 is formed such that the cutting insert 20 is fastened to the seat 4 by way of a fastening screw 21, other routine configurations, such as e.g. fastening by way of a clamping shoe or the like, are also possible.

[0040] The cutting edge 22 which comes into engagement with the material to be machined is formed on the cutting insert 20 in a manner known per se. The cutting insert 20 is manufactured from a hard and wear-resistant material and can in particular be formed from hard metal (cemented carbide), cermet or a cutting ceramic. In this respect, the cutting insert 20 can in particular be in the form of an indexable insert which has a plurality of cutting-edge regions which can be used in succession.

[0041] The turning tool holder 1 has an internal coolant guide which is formed to supply coolant through the interior of the turning tool holder 1 to the machining portion 3. The internal coolant guide has at least one first coolant inlet 5, via which coolant can be supplied into the inner coolant guide. Although the embodiment illustrated illustrates only one coolant inlet 5, which is formed on an end face of the clamping portion 2, the turning tool holder 1 can preferably have a plurality of alternatively usable coolant inlets 5 which are connected in each case to the internal coolant guide in a communicating manner. The cooling inlets which are respectively specifically not required can be closed by a closure element 6, as is illustrated in FIG. 1 by way of example for the first coolant inlet 5.

[0042] As can be seen in particular in FIG. 11 and FIG. 12, the turning tool holder 1 in the example specifically illustrated has a first coolant outlet 7a and a further coolant outlet 7b, which are formed in each case on a top surface 8 of the machining portion 3 at the side of the seat 4. In the embodiment, both the first coolant outlet 7a and the second coolant outlet 7b are formed to supply coolant to a rake face of the interchangeable cutting insert 20.

[0043] As can be seen in particular in FIG. 1, FIG. 2 and FIG. 11, in the embodiment a third coolant outlet 9, which is likewise fluidically connected to the internal coolant guide and by way of which coolant can be supplied to a free surface of the cutting insert 20, is furthermore formed.

[0044] Since the first coolant outlet 7a and the further coolant outlet 7b have a substantially identical form except for their spatial position, only the first coolant outlet 7a is described in more detail below and the description applies similarly to the further coolant outlet 7b.

[0045] The first coolant outlet 7a has a bore 10, which extends proceeding from the surface 8 of the machining portion 3 into the material of the turning tool holder 1 and, by way of the internal coolant guide, is fluidically connected to the first coolant inlet 5 and optionally further coolant inlets (if they are present). In the embodiment, the bore 10 is in the form of a cylindrical bore, the longitudinal axis of which extends perpendicular to the surface 8. In the embodiment, the bore 10 is provided in particular with a smooth wall.

[0046] As can be seen in particular in FIG. 6, FIG. 9 and FIG. 11, inserted in the bore 10 of the first coolant outlet 7a is an interchangeable nozzle body 30 which is described in more detail below. The nozzle body 30 can preferably be formed from a different material than the remainder of the turning tool holder, in particular from a harder and more wear-resistant material. By way of example, the nozzle body 30 can be formed from hard metal. In this case, it is particularly resistant to wear caused by flowing chips. The nozzle body 30 is furthermore also still illustrated individually in FIG. 3 and FIG. 4. The nozzle body 30 is formed in one piece and/or monolithically and has a shank region 31, which is formed in such a way that it can be inserted into the bore 10, and a nozzle outlet region 32 formed at an angle to said shank region. The shank region 31 is formed as rotationally symmetrical with respect to a longitudinal axis L, which is illustrated schematically in FIG. 4. In the embodiment specifically illustrated, formed on the outer circumference of the shank region is an annularly encircling depression, in which an annular sealing element 40 is arranged. In the configuration illustrated, the annular sealing element 40 is realized as an O-ring of rubber. The shank region 31 and the annular sealing element 40 are dimensioned such that the shank region 31 can be inserted into the bore 10 and the annular sealing element 40 is arranged here in a sealing manner between the outer circumferential surface of the shank region 31 and the inner circumferential surface of the bore 10. In this way, the annular sealing element 40 prevents an undesired passage of coolant between the outer circumferential surface of the shank region 31 and the inner circumferential surface of the bore 10.

[0047] The nozzle outlet region 32 of the nozzle body 30 that is at an angle is designed in such a way that a bottom side of the nozzle outlet region 32 lies on the surface 8 of the machining portion 3 when the shank region 31 is inserted into the bore 10. In order to secure the nozzle body 30 in its orientation and to prevent rotation of the nozzle body 30 about the longitudinal axis L, arranged on the surface 8 of the machining portion 3 is a first rotation-prevention element 11 which interacts with a second rotation-prevention element 33 arranged on the bottom side of the nozzle outlet region 32. In the exemplary embodiment illustrated in the drawings, the second rotation-prevention element 33 is in the form of a depression in the bottom side of the nozzle outlet region 32 and the first rotation-prevention element 11 is in the form of a projection engaging into said depression, as can be seen in particular in FIG. 9. This can be realized in a particularly easy and cost-effective manner. A reversed configuration is, however, also possible, in which the first rotation-prevention element 11 is in the form of a depression and the second rotation-prevention element 33 is in the form of a projection. In the example illustrated, the first rotation-prevention element 11 is formed by a pin 12, which is inserted into a bore 13 extending from the surface 8 of the machining portion 3, which allows a particularly cost-effective realization. The pin 12 can e.g. be pressed into a smooth-walled bore 13 or the pin 12 can be provided with an external thread which interacts with a corresponding internal thread in the bore 13.

[0048] The nozzle body 30 has, on the nozzle outlet region 32, an outlet opening 35 for a coolant jet that is designed, via the interaction of the first rotation-prevention element 11 and the second rotation-prevention element 33, in such a way that the coolant jet is directed onto a rake surface of a cutting insert 20 arranged on the seat 4. As can be seen in particular in FIG. 6 and FIG. 9, extending through the shank region 31 and the nozzle outlet region 32 that is at an angle to said shank region is an internal coolant channel 36, which is formed to conduct coolant from the internal coolant guide to the outlet opening 35. The internal coolant channel 36 extends in this case in a spatially curved manner through the nozzle body 30 and is free of abrupt changes in cross section, with the result that the coolant in the nozzle body 30 is deflected smoothly in the direction of the outlet opening 35. In the shank region 31, the internal coolant channel 36 extends substantially parallel and coaxial to the longitudinal axis L.

[0049] The fastening of the nozzle body 30 in the bore 10 is described in more detail below with reference to FIG. 3, FIG. 4 and FIG. 6.

[0050] As can be seen in FIG. 3 and FIG. 4, the shank region 31 of the nozzle body 30 is provided with a recess 37. In the exemplary embodiment, the recess 37 is in the form of a groove encircling the shank region 31 in an annular manner. In the example illustrated, the groove runs around in an annular manner in particular coaxial to the longitudinal axis L, which allows a particularly easy and cost-effective manufacture. The recess 37 furthermore has a substantially trapezoidal cross-sectional profile, as can be seen in FIG. 4 and FIG. 6. As can be discerned in particular in FIG. 6, a transverse bore 14 which is connected to the bore 10 in a communicating manner is formed in the machining portion 3 of the turning tool holder 1. The transverse bore 14 extends transverse to the bore 10 and consequently also transverse to the longitudinal axis L of the shank region 31. In particular, the transverse bore 14 can extend perpendicular to the longitudinal axis L. In the exemplary embodiment, the transverse bore 14 is in the form of a threaded bore with an internal thread and extends as far as a side surface of the machining portion 3.

[0051] Arranged in the transverse bore 14 is a clamping element 16, which is formed to engage into the recess 37 on the shank region 31 in order to fasten the nozzle body 30 to the machining portion 3. The clamping element 16 is provided with an external thread which interacts with the internal thread in the transverse bore 14. A side of the clamping element 16 that faces away from the bore 10 is provided with an engaging structure for a screwing tool, via which engaging structure the clamping element 16 can be actuated by a screwing tool, which is inserted into the transverse bore from the side surface of the machining portion 3. The engaging structure can e.g. be in the form of a slot for a flat-tipped screwdriver, a cross recess, a hexagonal socket, or the like. In the embodiment specifically illustrated, the clamping element 16 is in the form of a set screw.

[0052] As can be seen in FIG. 6, on the shank region 31 of the nozzle body 30, the recess 37 has a clamping surface 37a which runs obliquely with respect to the longitudinal axis L of the shank region 31 and is brought about by the trapezoidal cross-sectional profile of the recess 37. The clamping surface 37a is aligned obliquely here in such a manner that it departs from the longitudinal axis L as the distance from the nozzle outlet region 32 increases, thus the outer circumference of the shank region 31 widens as the distance from the nozzle outlet region 32 increases. That end face of the clamping element 16 which faces the bore 10 is laterally bevelled and/or chamfered, with the result that a holding surface 16a that likewise runs obliquely with respect to the longitudinal axis L is formed. The outer circumference of the clamping element 16 thus tapers in the direction of the bore 10. The position of the recess 37 on the shank portion 31 and the position of the transverse bore 14 are matched to one another such that the holding surface 16a of the clamping element 16 acts on the clamping surface 37a of the recess 37 in a wedge-shaped manner in accordance with the principle of the oblique plane in such a way that the nozzle body 30 is drawn into the bore 10 when the clamping element 16 is screwed into the transverse bore 14. In this way, the nozzle body 30 is clamped against the surface 8 of the machining portion 3, as a result of which the first rotation-prevention element 11 and the second rotation-prevention element 33 are also held in form-locking engagement.

[0053] The recess 37 is arranged on the shank region 31 between the nozzle outlet region 32 and the annular sealing element 40 such that the clamping mechanism formed by the clamping element 16 and the recess 37 is arranged in a manner protected from the coolant.

[0054] The further coolant outlet 7b is designed correspondingly to the first coolant outlet 7a. Consequently, a bore 10 and a transverse bore 14 are likewise provided with a clamping element 16 and, on the surface 8 of the machining portion 3, a first rotation-prevention element 11 is also provided there.

[0055] On account of the corresponding configuration of the first coolant outlet 7a and the further coolant outlet 7b, the nozzle body 30 can be inserted selectively into the bore 10 of the first coolant outlet 7a or into the bore 10 of the further coolant outlet 7b. It is also e.g. possible to insert a nozzle body 30 in each case both into the bore 10 of the first coolant outlet 7a and into the bore 10 of the second coolant outlet 7b, as illustrated e.g. in FIG. 11. When the intention is to use only one nozzle body 30, which e.g. can be the case if the arrangement of a nozzle body 30 in the bore 10 of the first coolant outlet 7a or in the bore 10 of the further coolant outlet 7b would have a spatially disruptive effect during the turning, the bore 10 of the first coolant outlet 7a or the bore 10 of the further coolant outlet 7b can be closed by a blind plug 50, which is also described below. Illustrated in FIG. 1, FIG. 2, FIG. 5 and FIG. 10 in each case is a situation in which the further coolant outlet 7b is closed in a fluid-tight manner by means of a blind plug 50.

[0056] When the intention is to use neither the first coolant outlet 7a nor the second coolant outlet 7b, both of said coolant outlets can be closed by respective blind plugs 50.

[0057] The blind plug 50 is illustrated in FIG. 8 in a side view without an annular sealing element 40, and in FIG. 7 in a perspective view with an annular sealing element 40 arranged thereon. The blind plug 50 has a shank region 51, the outer circumferential surface of which has a form which is substantially identical to the shank region 31 of the nozzle body 30, as can be seen in FIG. 7 and FIG. 8. For the purpose of simplification, the annular sealing element 40 is not illustrated in FIG. 10. The shank region 51 of the blind plug has a recess 37 with a clamping surface 37a and an encircling depression in which the annular sealing element 40 is received. Instead of the nozzle outlet region 32, in the case of the nozzle body 30 the blind plug 50 has a flat cover region 52, which has a somewhat larger cross section than the bore 10 and is formed as flat in such a way that it does not protrude to a great extent from the surface 8 of the machining portion 3 when the shank portion 51 is received in the bore 10.

[0058] On account of the substantially identical configuration of the shank region 51 of the blind plug 50 and the shank region 31 of the nozzle body 30, the blind plug 50 can be fastened in the same way to the clamping element 16 in the bore 10 of the first coolant outlet 7a and in the bore of the second coolant outlet 7b, as was previously described for the nozzle body 30.