WO2023030946A1

WO2023030946A1 - Cutting tool having a cooling-lubricant supply device

Info

Publication number: WO2023030946A1
Application number: PCT/EP2022/073320
Authority: WO
Inventors: Thomas Lehmann
Original assignee: Gühring KG
Priority date: 2021-09-01
Filing date: 2022-08-22
Publication date: 2023-03-09
Also published as: EP4395954A1; DE102021122655A1

Abstract

The invention relates to a cutting tool (1) having a main body (2, 3, 4) which extends along a central tool axis (A) and has at least one cutting-edge carrier (5, 6) as a functional portion, a cooling-lubricant supply device which is arranged in the main body (2, 3, 4) and comprises a central distributor (12), supplied with cooling lubricant from a central feeding point (10) in the main body (2, 3, 4), and at least one hose (14) which extends from the central distributor (12) through the main body (2, 3, 4) to a channel (16) formed in the cutting-edge carrier (5, 6) and leads to an associated cutting edge (7, 8) on the cutting-edge carrier (5, 6), and a dimensionally stable hose holder (18, 20, 22, 24) which extends coaxially with the tool axis (A), holds the at least one hose (14) and leads from the central distributor (12) to an associated channel (16) in the at least one cutting-edge carrier (5, 6).

Description

Cutting tool with cooling lubricant supply device

The invention relates to a cutting tool that has a base body that extends along a central tool axis. As a functional section, the base body has at least one blade holder, in which at least one channel is formed, which leads to an associated blade on the blade holder. In addition, the cutting tool has a cooling lubricant supply device arranged in the base body, which has a central distributor supplied with cooling lubricant from a central feed point in the base body and at least one hose leading from the central distributor through the base body to the at least one channel.

Such a cutting tool is known from WO 2010 020 234 A1. WO 2010 020234 A1 shows and describes in particular a milling tool that has a base body in which a channel arrangement for supplying cooling lubricant to cooling outlet openings of each cutting edge of the milling tool is formed. A central distributor element is arranged in the milling tool, which element extends along the tool axis and is connected to the individual cooling outlet openings by the channel arrangement, which includes a large number of hoses. The cooling lubricant can be supplied in a targeted manner to the points to be cooled/lubricated by the hoses of the channel arrangement which emanate from the central distributor element and which each lead individually to an assigned cooling channel formed in the base body material or to an assigned cutting edge.

With such a cutting tool, the cutting edges should be cooled and lubricated by so-called minimum quantity lubrication (MMS technology), in which air (oil-gas mixture or aerosol) mixed with the finest oil droplets is fed under high pressure through the hoses to the Channels are routed in the body and to the cutting edges. In contrast to wet lubrication, the tool cutting edges are treated with minimum quantity lubrication Less cooling lubricant is supplied per unit of time, so that the tool cutting edges have to be cooled and lubricated precisely at the point where the frictional heat is generated. With minimum quantity lubrication, a sharp-edged change in direction of the hoses can lead to the oil-gas mixture segregating, so that adequate cooling or lubrication can no longer be guaranteed.

In the case of the tool known from WO 2010 020 234 A1, a large number of hoses are arranged in the base body, which have different lengths depending on the position of the cutting edges and extend freely within the base body to different extents. Due to their flexible design, the relatively long hoses are subjected to rotational and centrifugal forces when machining workpieces, which can lead to uncontrolled movements of the hoses in the base body, which in turn can cause imbalances or the alignment of the hoses to change in an undesirable way and the cooling lubricant is no longer supplied to the respectively associated cooling outlet openings.

It is therefore the object of the invention to provide a generic tool in which a reliable supply of cooling lubricant to all cutting edges is guaranteed even with a complex tool design, in which good balancing properties can be achieved over the long term and which at the same time is designed to be as weight-saving as possible but stable.

The object of the invention is achieved by a cutting tool with the features of claim 1. Advantageous developments are the subject of the subclaims.

In particular, the object of the invention is achieved in that the tool has a dimensionally stable hose holder which extends coaxially to the tool axis and holds the at least one hose and leads from the central distributor to the associated channel in the at least one blade holder. In contrast to the prior art acknowledged at the outset, in which the hoses emanating from the central distributor are essentially free within the Base body are arranged, the hoses are guided and fixed in the tool according to the invention by the dimensionally stable or dimensionally stable hose holder. As a result, the hoses, which are made of PVC, for example, are held in a stable and kink-free position. Dimensionally stable means that the hose holder is self-supporting, i.e. resistant to the forces acting on it, in particular rotational forces, so that the position and shape of the hose holder can change during operation of the tool (in contrast to non-dimensionally stable, elastic, easily bendable hoses). cannot change.

According to a preferred embodiment, the hose holder can be a hollow body structure that is rotationally symmetrical with respect to the tool axis. This has the advantage that the hose holder has a particularly low weight on the one hand and good balancing properties on the other. Thus, the additional provision of the hose holder does not adversely affect the operation of the tool. The hollow body structure allows the at least one hose to be guided and fixed in or through the base body in such a way that free and therefore uncontrolled hose movement within the base body during machining is at least largely prevented.

The hollow body structure can be manufactured in one piece or be built up modularly from hollow body structural elements which are manufactured in one piece and joined together. Since the hollow body structure has a complex structure, particularly with a large number of hoses that are to be held and lead to associated cutter carriers or cutters, the hollow body structure or the hollow body structural elements can preferably be produced additively by a 3D printing process.

According to a preferred embodiment, the at least one hose can run at least in sections within the hollow body structure. This means that the hose holder has a preferably axial cavity in which the hose is arranged. The position of the hose can be fixed via the hollow body structure in such a way that undesired hose movements occur even with the forces occurring during machining of a workpiece remain under. Alternatively, it is also possible for the at least one tube to be attached to the outside of the hollow body structure, for example to be attached to the outer circumference of the tube holder. With a large number of hoses, the hollow body structure also offers the possibility of guiding and fixing one or more hoses on the inside and one or more hoses on the outside along the hollow body structure to the cutter support section or to various cutter support sections.

According to a preferred embodiment, the hose holder can have a first hose deflector, which deflects the at least one hose from an axial direction into a radial direction. In this way, the cooling lubricant can be conducted via the hose from the central feed point to the cutting edges usually arranged on the outer circumference of the tool or to channels formed in the base body, which in turn lead to the cutting edges. Since a cavity is formed within the base body, in which the central distributor is arranged, from which the hose originates, the first hose deflector ensures that the hose is also positioned in a defined position in the radial intermediate area between the central distributor and the base body material. so that the hose has no freedom of movement in its hose section that connects the central distributor with the associated channel in the base body.

According to a development of the preferred embodiment, the first hose deflector can preferably be attached axially to the central distributor, in particular in a form-fitting and/or detachable manner. For example, the first hose deflector can be attached to the central distributor via a preferably non-rotatable snap connection. The detachable connection has the advantage that the first hose deflector can be easily replaced. In addition, the snap connection enables tool-free and therefore particularly simple assembly.

According to the preferred embodiment, the first hose deflector can have a convexly curved holding section for each hose, which has a U-shaped cross section and in which the associated hose is positively and/or is releasably recorded or glued. The positive accommodation of the hose in the holding section thus prevents the hose from being able to shift as a result of rotational forces. The convex curvature has the advantage that the tube can transition into the associated channel in the base body, which is aligned essentially in the radial direction, without a sharp-edged change in direction.

According to the preferred embodiment, the first hose deflector can be firmly connected to the base body, in particular screwed axially. This means that the first hose deflector is fixed immovably in the base body, so that it forms a non-rotatable and axial unit with the base body.

According to a preferred embodiment, the hose holder can—as already mentioned—have a modular structure. Modular is understood to mean that the hose holder is constructed in several parts and the individual parts, ie for example the hollow body structural elements mentioned above, of the hose holder are connected to one another at defined interfaces. In particular, the individual parts of the hose holder come in different sizes and/or slightly different structures, with the defined interfaces being kept identical regardless of the size and the rest of the structure. This enables a particularly diverse use of the hose holder for different tools. The hose holder, in particular the first hose deflector, can preferably have a defined interface geometry to the central distributor, so that hose holders, in particular first hose deflectors, of different sizes can be attached to the central distributor with the same interface geometry.

According to a preferred embodiment, the hose holder can have a tubular hose guide and a second hose deflector, which deflects the at least one hose from an axial direction into a radial direction. In particular, the hose guide serves to guide the hose axially, i.e. axially to an area spaced from the central distributor, while the hose deflector serves to guide the hose radially outwards, preferably from the area axially spaced from the central distributor in radial direction to lead. In other words, the axial and radial guidance of the hose is divided between different components of the dimensionally stable hose holder, so that the hose holder can be used in a modular manner. At the same time, the hose holder can be expanded in almost any way and, as in the preferred embodiment, can also be used for a stepped machining tool.

According to the preferred embodiment, the hose guide can be attached axially to the central distributor, in particular in a form-fitting and/or detachable manner. For example, the hose guide can be attached to the central distributor via a preferably non-rotatable snap connection. The detachable connection has the advantage that the hose guide can be easily replaced. In addition, the snap connection enables tool-free and therefore particularly simple assembly. In particular, both the hose guide and the first hose deflector can be connected to the central distributor separately from one another, so that the two individual parts can also be used independently of one another, i.e. without the other individual part. For example, it may be sufficient to only provide the first hose deflector or only to provide the hose guide, which is possible due to the separate connection of the first hose deflector and the hose guide to the central distributor.

According to the preferred embodiment, the second hose deflector can be attached axially to the hose guide, in particular in a form-fitting and/or detachable manner. For example, the second hose deflector can be attached to the hose guide via a preferably non-rotatable snap connection. The detachable connection has the advantage that the second hose deflector can be easily replaced. In addition, the snap connection enables tool-free and therefore particularly simple assembly.

According to the preferred embodiment, the second hose deflector can have a through hole for each hose or for each pair of hoses, in which the associated hose or hoses is/are accommodated or glued in a form-fitting and/or detachable manner. Through the form-fitting inclusion of the Hose in the through hole is thus prevented that the hose can move due to rotational forces.

According to the preferred embodiment, the second hose deflector can be firmly connected to the base body, in particular screwed axially. This means that the second hose deflector is fixed immovably in the base body, so that it forms a non-rotatable and axial unit with the base body.

According to a preferred embodiment, the central distributor can be fixed axially between the base body and the hose holder. This means that the central distributor is held in a form-fitting manner in the axial direction between the base body and the hose holder, so that no separate attachment of the central distributor to the base body is required, since the hose holder is already fixed axially to the base body. In this way, the number of necessary components can be further reduced. According to a preferred embodiment, the central distributor can be detachably fixed in the base body by the hose holder. The detachable connection has the advantage that the central distributor can be easily replaced.

According to a preferred embodiment, the central distributor can be a self-supporting hollow body structure. The weight of the central distributor can be further reduced by the hollow structure.

According to a preferred embodiment, the central distributor can have a central channel which is connected to the feed point in the base body and a plurality of branch channels which are supplied with cooling lubricant from the central channel and are preferably distributed in the circumferential direction. This has the advantage that a central cooling-lubricating medium flow can be divided into several partial flows within the central distributor, in order to then be carried on individually from there via the hoses.

According to the preferred embodiment, the central channel can have a sealing section in which a feed pipe forming the feed point can be accommodated in a sealed manner. This ensures that at the feed point no cooling lubricant escapes, but can be distributed within the central distributor and fed to the cutting edges from there.

According to the preferred embodiment, the sealing section can have sealing lips directed radially inwards, which are formed on the inner circumference of an expansion wall elastically deformable in the radial direction. The expansion wall can thus ensure a tight connection between the feed pipe and the central distributor, via which the position of the two components relative to one another is fixed at the same time.

According to the preferred embodiment, the central distributor between the central channel and the branch channels can have guide grooves separated by radial walls arranged in a star shape. Due to the radial walls arranged in a star shape, the central coolant flow can be separated particularly easily into several, preferably equal, partial flows.

According to the preferred embodiment, the guide grooves can have a twist counter to a predetermined direction of rotation of the tool. This has the advantage that the cooling lubricant guided through the guide grooves is accelerated due to the spiraling and thus better distribution and supply of the cooling lubricant to the cutting edges can be ensured.

According to a preferred embodiment, the central distributor can have a receiving opening for each hose, in which the associated hose is accommodated, in particular glued in place. This ensures a precise fit between the central distributor and the hose or hoses. In this case, the receiving opening can preferably have a radially stepped design, with a first diameter corresponding to an outer diameter of the hose and a second diameter corresponding to an inner diameter of the hose. This has the advantage that the cooling lubricant can be fed into the hose without any transition.

According to a preferred embodiment, the base body can have at least two blade carrier sections that are axially spaced apart from one another each is assigned a hose deflector. This means that the base body is designed as a step tool and each step of cutting edges is supplied with cooling lubricant via hoses accommodated in a hose deflector.

According to a preferred embodiment, the base body can have a shank section with a clamping shank for connection to a machine tool spindle, and an extension section adjoining the shank section. The shank section and/or extension section can have at least one cutting edge support as a functional section.

According to a preferred embodiment, the base body can have an axial cavity in which the hose holder is arranged centrally at least in sections, i.e. at least in sections along the tool axis, at a radial distance from the wall of the cavity. This means that the hose holder is used for guided, dimensionally stable reduction of the radial distance (for the hoses) between the cavity wall and the central distributor, with a (considerably smaller) radial distance between the hose holder and the cavity wall (compared to the hose section guided through the hose holder or compared to a radial distance between the wall of the cavity and the central distributor without a hose holder) in which the hoses are unguided. In other words, the hose holder significantly reduces the length of the free hose sections that exit/are not guided in a guide, so that the radial distance is more or less bridged.

Brief description of the characters

1 is a perspective view of a cutting tool according to the present invention;

Figure 2 is a side view of the tool Figs. 3 to 6 are different longitudinal sectional perspective views of the tool;

Figs. 7 and 8 are top perspective views of the tool;

Figs. Figures 9 and 10 are different representations of a central manifold of the tool;

11 is a plan view of a first hose diverter of a hose holder of the tool;

Fig. 12 is a perspective view of a second hose diverter of the hose holder of the tool; and

Figs. 13 and 14 are various illustrations of a hose guide of the hose holder of the tool.

A preferred embodiment of the present invention will be described below based on the accompanying figures. Identical elements are marked with the same reference symbols.

Figs. 1 to 6 show different views of a cutting tool 1 according to the invention, in which, depending on the illustration, only individual sections of the tool 1 are shown and/or individual components of the tool 1 are omitted from the illustration.

The tool 1 can be driven in rotation and has a base body 2 extending along a central tool axis A. The base body 2 has a shank section 3 and an extension section 4 adjoining the shank section 3 in the axial direction/along the tool axis A. The shank section 3 has a first blade carrier/blade carrier section 5 as a functional section. The extension section 4 has a second as a functional section At least one first cutting edge 7 of the tool 1 is or can be accommodated on the first cutting edge support section 5 . In the embodiment shown, a plurality of first cutting edges 7 of the tool 1 are or can be accommodated on the first cutter support section 5 . At least one second cutting edge 8 of the tool 1 is or can be accommodated on the second cutter support section 6 . In the embodiment shown, a plurality of second cutting edges 8 of the tool 1 are or can be accommodated on the second cutter support section 6 .

The shank section 3 is arranged on the machine tool side and has a clamping shank 9 for connection to a machine tool spindle. A torque from the machine tool spindle for driving the tool 1 can be transmitted to the base body 2 via the clamping shank 9 . The extension section 4 is arranged on the workpiece side. The shank section 3 and the extension section 4 are firmly connected to one another so that they rotate integrally with one another about the tool axis A when the torque is introduced. The base body 2 has a preferably central cavity 10 that extends along the tool axis A/in the axial direction and is open, for example, to an axial, workpiece-side end face of the base body 2 .

Furthermore, the tool 1 has a cooling lubricant supply device which is arranged in the base body 2 and via which the cooling lubricant can be introduced into the base body 2 . The cooling lubricant supply device is connected to a cooling lubricant source via the machine tool spindle, for example. A central feed point 11 is formed in the base body 2 , which in the illustrated embodiment is designed as a feed pipe 13 accommodated in the base body 2 . The feed pipe 13 extends in the axial direction and is arranged coaxially with the tool axis A, ie in the center of the base body 2 . The cooling lubricant supply device has a central distributor 12 which is connected to the central feed point 11 for the cooling lubricant supply. In the central distributor 12, a central cooling lubricant flow coming from the feed point 11 is divided into several individual partial flows. The cooling lubricant supply device has at least one hose 14 (shown only in FIG. 4 ), which is fluidically connected to the central distributor 12 , in particular is accommodated in the central distributor 12 . The tube 14 is in particular flexible, ie designed to be bendable, for example made of an elastic plastic material. The cooling lubricant supply device preferably has a number of hoses which are each assigned to the central distributor 12 in such a way that they lead one of the number of individual partial flows from the central distributor 12 to a point to be cooled. In particular, the at least one hose 14 or hoses 14 runs from the central distributor 12 through the base body 2, in particular the cavity 10 extending in the axial direction in the base body 2, to the point(s) of the tool 1 to be cooled, such as the cutting edges 7, 8 of the tool 1, or to one or more channels 16 leading to the points of the tool 1 to be cooled, which are formed in the material of the base body 2 and forward/further distribute the cooling lubricant supplied via the hoses 14.

In the embodiment shown, the cooling lubricant is fed in centrally at the central distributor 12 and is guided radially outwards through the cavity 10 in the base body 2 via the hoses 14 to the channels 16, through which the cooling lubricant in turn reaches the points to be cooled, such as in each case an associated cutting edge of the stepwise arranged cutting edges 7, 8 of the tool 1 is guided.

According to a central aspect of the invention, the tool 1 has a dimensionally stable hose holder 18 . The hose holder 18 holds the at least one hose 14 and guides it from the central distributor 12 to the channel 16 assigned to it in the base body 2. This means that the position of the hose 14 (or the several hoses 14) is controlled by the dimensionally stable hose holder 18 is fixed, so that the tube 14 accommodated in the tube holder 18 does not move or remains in its position, in particular within the cavity 10 in the base body 2 - even when driving forces or machining forces act on the tool 1. Thus, the hose 14, which is not dimensionally stable due to its structural design is held in its desired position by the additional provision of the dimensionally stable hose holder 18 . The hose holder 18 extends coaxially to the tool axis A and is accommodated in the cavity 10 of the base body 2, preferably centrally.

The hose holder 18 can be arranged at a radial distance from the wall of the cavity, so that the hose 14 can be routed unguided/not through the dimensionally stable hose holder 18 is performed. The hose holder 18 can also bear against the cavity wall in the radial direction, at least in the area in which the hose 14 is accommodated. The hose holder 18 can also rest axially and/or radially on the base body 2 for attachment to the base body 2 .

The hose holder 18 is designed to be rotationally symmetrical with respect to its longitudinal axis, which corresponds to the tool axis A when it is mounted in the base body 2 . The hose holder 18 has a dimensionally stable hollow body structure, so that the hoses 14 run at least in sections inside the hose holder 18, i.e. inside the hollow body structure. In particular, the hoses 14 are guided axially within the hollow body structure.

In the embodiment shown, the hose holder 18 has a multi-part design. Alternatively, the hose holder 18 can also be designed in one piece/in one piece of material, even if this is not shown.

The hose holder 18 has a first hose deflector 20, which deflects the hoses 14 from an axial direction into a radial direction. In particular, the first hose deflector 20 is designed in such a way that it guides several of the hoses 14 accommodated in the central distributor 12 directly to the respectively assigned channel 16 in the clamping section 6 of the base body 2 . The hose holder 18 has a tubular hose guide 22, which guides a plurality of hoses 14 accommodated in the hose guide in the axial direction into an area of the base body that is at a distance from the central distributor 12, in order to continue guiding the hoses 14 from there to the assigned point to be supplied with cooling lubricant . The hose guide 22 is firmly connected to the first hose deflector 20 . In particular, a first number of hoses 14 are guided radially outwards from the central distributor 12 through the first hose deflector 20 and a second number of hoses 14 are guided away axially through the hose guide 22 from the central distributor 12 in the direction of the extension section 8.

The hose holder 18 has a second hose deflector 24 which deflects a plurality of hoses 14 accommodated in the second hose deflector 24 from an axial direction into a radial direction. In particular, the second hose deflector 24 is designed such that it guides the hoses 14 that are axially routed away from the central distributor 12 through the hose guide 22 , from there to the respective assigned channel 16 in the extension section 8 of the base body 2 . The second hose link 24 is firmly connected to the hose guide 22 .

The hose holder 18 is thus constructed in a modular manner from the first hose deflector 20 , the hose guide 22 and the second hose deflector 24 . The first hose deflector 20 is preferably assigned to the cutter support section 5 of the clamping section 3 and the second hose deflector 24 to the cutter support section 6 of the extension section 4 arranged at an axial distance therefrom. In this case, the individual parts are firmly connected to one another in the assembled state, but can be replaced by other individual parts for use in another tool, which can, for example, carry a different number of hoses or have different geometric dimensions.

The central distributor 12 is fixed axially between the base body 2 and the hose holder 18 . In particular, the central distributor 12 is in a substantially cylindrical axial recess in the clamping section 3 added, so that the central distributor 12 on its one (machine tool spindle side) axial side rests against the base body 2 in a form-fitting manner. From its other (workpiece-side) axial side, the central distributor 12 is in positive contact with the hose holder 18 .

The hose holder 18 is fixed axially in the base body 2 . It can be seen in particular in FIG. 4 that the hose holder 18, in particular the second hose deflector 24, is firmly screwed to the base body 2 in the axial direction. The hose holder 18, in particular the second hose deflector 24, is arranged/clamped axially between a shoulder formed on the base body 2, in particular the extension section 4, and a fastening plate 26 and via a plurality of fastening means, in the illustrated embodiment in the form of screws 28, which are screwed through pass through the second hose diverter 24 and engage a threaded hole 30 in the shoulder.

As can be seen in FIG. 4, the hose guide 22 and the second hose deflector 24 are fastened to one another in a form-fitting and/or detachable manner, in the illustrated embodiment by means of a snap connection 32 . The second hose deflector 24 bears against the hose guide 22 in one axial direction and engages behind the hose guide 22 in the other axial direction. The snap-in connection 32 is formed by a plurality of snap-in hooks 34 formed on the second hose deflector 24 , which grip counter-sections 36 formed on the hose guide 22 radially on the outside and engage axially behind for axial fixing. A detailed embodiment of the snap connection 32 is also described below with reference to FIGS. 12 and 14 described.

As can be seen in FIG. 5, the central distributor 12 and the first hose deflector 20 are fastened to one another in a form-fitting and/or detachable manner, in the illustrated embodiment by means of a snap connection 38 . The first hose deflector 20 bears against the central distributor 12 in one axial direction and engages behind the central distributor 12 in the other axial direction. The snap connection 38 is formed by a plurality of snap hooks 40 formed on the first hose deflector 20 and the snap hooks 40 formed on the central distributor 12 Grip counter sections 42 radially on the outside and grip axially behind for axial fixation.

As can be seen in FIG. 5, the central distributor 12 and the hose guide 22 are fastened to one another in a form-fitting and/or detachable manner, in the illustrated embodiment by means of a snap connection 44 . The hose guide 22 bears against the central distributor 12 in one axial direction and engages behind the central distributor 12 in the other axial direction. The snap-in connection 44 is formed by a plurality of snap-in hooks 46 formed on the hose guide 22, which grip counter-sections 48 formed on the central distributor 12 (cf. FIG. 9) radially on the outside and engage axially behind for axial fixing. A detailed embodiment of the snap connection 44 is also described below with reference to FIGS. 9 and 13 described.

As can be seen in FIG. 6, the first hose deflector 20 has a holding section 50 for each hose 14 that is guided through the first hose deflector 20, in which the associated hose 14 can be accommodated. The holding sections 50 have an essentially U-shaped/horseshoe-shaped cross section, the inside diameter of which essentially corresponds to the outside diameter of the hose 14 to be held. An opening of the U-shaped cross section is preferably smaller than the outside diameter of the hose 14 to be held. As a result, the hoses 14 can be held in the holding sections 50 with a positive fit and can be held in a detachable manner if the hose 14 and/or the holding section 50 is elastic. A longitudinal axis of each holding section 50 is curved in the radial and axial direction, in particular convexly curved, and extends from the central distributor 12 essentially in a star shape radially outwards. The longitudinal axis of each holding section 50 is aligned with the associated channel 16 in each case, so that a hose 14 accommodated in the holding section 50 has a substantially identical curvature from the central distributor 12 to the channel 16 . For example, the hoses 14 also continue the curvature predetermined by the holding section 50 in a predetermined hose section that is not guided by the holding section 50 . The first hose deflector 20 has a perpendicular to the tool axis A extending Base section 52 and a reinforcing section 54, for example annular, extending from base section 52 along tool axis A. The holding sections 50 run essentially in a star shape, ie in the radial direction, and are formed on stiffening ribs 56 running in the radial direction.

Figs. 7 and 8 show perspective top views of the tool 1, only the shank section 3, the central distributor 12, the first hose deflector 20 and the hose guide 22 being shown in FIG. 7 and only the shank section 3 and the first hose deflector 20 being shown in FIG . It can be seen that the tool 1 has assembly markings formed in its individual parts, which define a correct assembly position of the individual parts relative to one another in the circumferential direction. This means that an assembly projection 58 formed on the hose guide 22, an assembly groove 60 formed on an outer circumference of the central distributor 12, an assembly groove 62 formed on an inner circumference of the first hose link 20 must be brought into alignment with a reference mark 64 on the shaft section 3.

In addition, in Figs. 7 and 8 that fastening holes 66 running in the axial direction are formed on the first hose link 20, in particular in its bottom section 52, with which the hose holder 18, in particular the first hose link 20, can be screwed axially to the base body 2. The mounting holes 66 must be rotated through a predetermined angle, 25° in the illustrated embodiment.

Furthermore, in Figs. 7 and 8 that several connecting projections 68 are formed on the shank section 3, which extend along the tool axis A and are distributed over the circumference, with which the shank section 3 and the extension section 4 can be fixed to one another for a non-rotatable connection. In particular, correspondingly designed connecting holes can be formed in the extension section 4, in which the connecting projections 68 engage in a form-fitting manner. Figs. 9 and 10 show the central distributor 12 in a perspective view and in a longitudinal sectional view. The central distributor 12 is a dimensionally stable hollow body structure which extends coaxially to the tool axis A. The central distributor 12 has a central channel 70 adjoining the feed point 11 in the base body 2 and a plurality of branch channels 72 supplied with cooling lubricant by the central channel 70 . The branch channels 72 are distributed in the circumferential direction. The branch channel 70 has a conically tapering guide section 74 and a sealing section 76 adjoining it. The feed pipe 13 forming the feed point 11 can be accommodated in a sealed manner in the sealing section 76 . The sealing portion 76 has a plurality of sealing lips 78 directed radially inward, which are formed on an inner periphery of an expansion wall 80 elastically deformable in the radial direction.

Between the central duct 70 and the branch ducts 72 , the central distributor 12 has guide grooves 82 which guide the cooling lubricant and are separated by radial walls arranged in a star shape and through which the coolant flow is divided into the plurality of partial flows in the branch ducts 72 . The guide grooves 82 can preferably have a twist counter to a predetermined direction of rotation of the tool 1, i.e. they can be set. Alternatively, the guide grooves 82 can be straight. At the ends of the branch channels 72, i.e. each tube 14 to be received in the central distributor 12, the central distributor 12 has a receiving opening 84, in which the associated tube 14 is received or can be received. The receiving opening 84 is stepped in particular in the radial direction, with a first, outer diameter corresponding to an outer diameter of the tube 14 to be received and a second, inner diameter corresponding to an inner diameter of the tube 14 to be received.

The counter-sections 42 described above for receiving the snap hooks 40 of the first hose deflector 20 are formed on the central distributor 12 . The mating sections 42 are arranged distributed in the circumferential direction and are set back axially, so that the engaging snap hooks 40 are fixed in the axial direction by means of the snap connection 38 and due to the axial offset of the mating sections 42 spaced apart in the circumferential direction also in Circumferentially abut the central distributor 12 in a form-fitting manner and be fixed in the direction of rotation/circumferential direction.

In addition, the counter-sections 48 described above for receiving the snap hooks 46 of the hose guide 22 are formed on the central distributor 12 . The mating sections 42 are distributed in the circumferential direction and are each formed between two axial projections 86 of the central distributor 12, so that the engaging snap hooks 46 are fixed in the axial direction by means of the snap connection 44 and their position in the circumferential direction between the two projections 86 is fixed. The projections 86 are preferably arranged in such a way that the snap-in hooks 46 can be displaced by the predetermined angle, by 25° in the illustrated embodiment, in order to ensure assembly.

11 shows the first hose deflector 20 in a plan view. As described above, the first hose deflector 20 has the annular bottom section 52 extending in an axial plane, i.e. perpendicular to the tool axis A, the circumferential, annular stiffening section 54 extending along the tool axis A, and the other ones extending essentially in the radial direction , i.e. stiffening ribs 56 arranged in a star shape, wherein the hoses 14 can be accommodated in the holding sections 50 and can be held in a dimensionally stable manner, guided radially from the inside to the outside. In addition, the first hose deflector 20 has the fastening holes 66 in the base section 52 in order to be able to screw the first hose deflector 20 to the base body 2 .

12 shows the second hose deflector 24 in a perspective view. As described above, the second hose deflector 24 has a plurality of snap hooks 34 (six in the illustrated embodiment) distributed over the circumference, which engage around countersections 36 formed on the hose guide 22 radially on the outside and engage axially behind for axial fixing. In the circumferential direction between the snap hooks 34, the second hose deflector 24 has radial openings 88 for receiving the hoses 14, through which the hoses 14 can be passed from radially inside to radially outside. In the illustrated embodiment, two hoses 14 are accommodated in one of the openings 88 (cf. FIG. 4).

In addition, the second hose deflector 24 has a first hose guide section 90 and a second hose guide section 92, each of which is designed in the form of a through hole oriented essentially in the axial direction. The two hose guide sections 90, 92 are arranged nested in the radial direction and each serve to accommodate one hose 14 of the two hoses 14 guided through an associated opening 88. This means that the two hose guide sections 90, 92 are arranged radially aligned. The first hose guide portion 90 is disposed radially inside of the second hose guide portion 92 and is formed as a hole closed in the circumferential direction. The second hose guide section 92 is open outwards in the radial direction and a hose 14 accommodated therein is held on the second hose deflector 24 by two lugs pointing inwards in the circumferential direction. The hoses 14 can be loosely accommodated in the opening 88 and the hose guide sections 90, 92 in a form-fitting manner, or they can be glued in place.

Furthermore, the second hose deflector 24 has axial fastening holes 94 embodied as through-holes distributed over the circumference, via which the second hose deflector 24 can be screwed axially to the base body 2 (cf. FIG. 4).

Figs. 13 and 14 show the hose guide 22 in a perspective view in longitudinal section and a perspective view of a detail thereof. The hose guide 22 has a central hollow circular-cylindrical section 96, on one axial (workpiece-side) side of which there is a conical, radially outwardly widening first funnel section 98 and on the other axial (machine tool-side) side of which there is a conical, radially outwardly widening second funnel section 100 connects. As described above, the hose guide 22 has at its one axial end several snap hooks 46 (four in the illustrated embodiment) distributed over the circumference, which radially engage around counter-sections 48 formed on the central distributor 12 and engage axially behind for axial fixation. The snap hooks 46 are arranged at a free end of the second funnel section 100 .

In addition, the hose guide 22 has, at its other axial end, the plurality of (six in the illustrated embodiment) mating sections 36 for receiving the snap hooks 34 of the second hose link 24 . The mating sections 36 are formed at the largest outside diameter of the first funnel section 98 . The mating sections 36 are distributed in the circumferential direction and are each arranged between two radial projections 102 of the hose guide 22, so that the engaging snap hooks 34 are fixed in the axial direction by means of the snap connection 32 and their position in the circumferential direction between the two projections 100 is fixed. Furthermore, the assembly projection 58 is formed on the hose guide 22 and is used for the correct alignment of the hose guide 22 in the circumferential direction.

Claims

22 claims

1. Cutting tool (1), with a base body (2, 3, 4) which extends along a central tool axis (A) and has at least one cutting edge carrier (5, 6) as a functional section, and one in the base body (2, 3 , 4) arranged cooling lubricant supply device, which comprises a central distributor (12) supplied with cooling lubricant from a central feed point (11) in the base body (2, 3, 4) and at least one hose (14) which runs from the central distributor (12) through the base body ( 2, 3, 4) through to a channel (16) formed in the cutter holder (5, 6) which leads to an associated cutter (7, 8) on the cutter holder (5, 6), characterized by a coaxial to the tool axis ( A) extending, dimensionally stable hose holder (18, 20, 22, 24), which holds the at least one hose (14) and from the central distributor (12) to an associated channel (16) in the at least one blade carrier (5, 6) leads.

2. Tool (1) according to claim 1, characterized in that the hose holder (18, 20, 22, 24) is a rotationally symmetrical hollow body structure with respect to the tool axis (A).

3. Tool (1) according to claim 2, characterized in that the at least one hose (14) runs at least in sections within the hollow body structure.

4. Tool (1) according to one of the preceding claims, characterized in that the hose holder (18, 20, 22, 24) comprises a hose deflector (20) which guides the at least one hose (14) from an axial direction into a radial direction deflects, the hose deflector (20) preferably being attached axially to the central distributor (12), in particular in a form-fitting and/or detachable manner, for example via a snap connection (38).

5. Tool (1) according to claim 4, characterized in that the first hose deflector (20) per hose has a convexly curved, U-shaped Having cross-section holding section (50), in which the associated hose (14) is positively and / or releasably received.

6. Tool (1) according to claim 4 or 5, characterized in that the hose holder (18, 20, 22, 24), in particular the hose deflector (24), is firmly connected to the base body (2, 3, 4), in particular is screwed.

7. Tool (1) according to any one of the preceding claims, characterized in that the hose holder (18, 20, 22, 24) is modular.

8. Tool (1) according to one of the preceding claims, characterized in that the hose holder (18, 20, 22, 24) comprises a tubular hose guide (22) and a hose deflector (24) which is connected to the hose guide (22) and which deflects at least one hose (14) guided along the hose guide (22) from an axial direction into a radial direction.

9. Tool (1) according to claim 8, characterized in that the hose guide (18, 20, 22, 24) is attached axially to the central distributor (12), in particular positively and/or detachably, for example via a snap connection (44). and/or the hose deflector (24) is attached axially to the hose guide (22), in particular in a form-fitting manner and/or detachably, for example via a snap connection (32).

10. Tool (1) according to claim 8 or 9, characterized in that the hose deflector (24) per hose (14) or per two hoses (14) has a through hole (88, 90, 92) in which the associated hose (14) or the associated hoses is/are accommodated in a form-fitting and/or detachable manner.

11. Tool (1) according to any one of claims 8 to 10, characterized in that the hose deflector (24) is firmly connected to the base body (2, 3, 4), in particular screwed.

12. Tool (1) according to one of the preceding claims, characterized in that the central distributor (12) is arranged axially between the base body (2, 3, 4) and the hose holder (18, 20, 22, 24) and/or through the hose holder (18, 20, 22, 24) is detachably fixed in the base body (2, 3, 4).

13. Tool (1) according to one of the preceding claims, characterized in that the central distributor (12) is a dimensionally stable hollow body structure which extends coaxially to the tool axis (A).

14. Tool (1) according to one of the preceding claims, characterized in that the central distributor (12) has a central channel (70) adjoining the feed point (10) in the base body (2, 3, 4) and several from the central channel (70). Has branch channels (72) supplied with cooling lubricant and preferably distributed in the circumferential direction.

15. Tool (1) according to claim 14, characterized in that the central channel (12) has a sealing section (76) in which a feed point (11) forming the feed pipe (13) can be accommodated in a sealed manner.

16. Tool (1) according to claim 15, characterized in that the sealing section (76) comprises sealing lips (78) directed radially inwards, which are formed on the inner circumference of a radially elastically deformable expansion wall (80).

17. Tool (1) according to one of claims 14 to 16, characterized in that the central distributor (12) between the central channel (70) and the branch channels (72) has guide grooves (82) which carry cooling lubricant and are separated by radial walls arranged in a star shape.

18. Tool (1) according to claim 17, characterized in that the guide grooves (82) have a twist counter to a predetermined direction of rotation of the tool (1). 25

19. Tool (1) according to one of the preceding claims, characterized in that the central distributor (12) has a receiving opening (84) for each hose (14), in which the associated hose (14) is received, the receiving opening (84) is preferably radially stepped, with a first diameter corresponding to an outer diameter of the hose (14) and a second diameter to an inner diameter of the hose (14).

20. Tool (1) according to one of Claims 8 to 19, characterized in that the base body (2, 3, 4) has at least two blade carrier sections (5, 6) spaced apart axially, each of which has a hose deflector (20, 24) assigned.

21. Tool (1) according to one of the preceding claims, characterized in that the base body (2, 3, 4) has a shank section (3) with a clamping shank (9) for connection to a machine tool spindle, and to the shank section (3) subsequent extension section (4), wherein the shank section (3) and/or extension section (4) have at least one cutter support as a functional section.

22. Tool (1) according to any one of the preceding claims, characterized in that the base body (2, 3, 4) has an axial cavity (10) in which the hose holder (18, 20, 22, 24) with a radial distance is arranged centrally to a wall of the cavity (10).