US20030215295A1

US20030215295A1 - Tool, device and method for deburring bore holes

Info

Publication number: US20030215295A1
Application number: US10/246,530
Authority: US
Inventors: Gilbert Gaiser; Harald Hebisch
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-05-17
Filing date: 2002-09-19
Publication date: 2003-11-20
Also published as: US20050095072A1; US7290965B2; JP2003340631A

Abstract

A rotationally driven tool for deburring bore holes, which join laterally into a substantially cylindrical recess. The tool contains a cutting head seated on a shaft, wherein the cutting head contains at least one cutting edge, which extends in the axial direction at least one some sections. In order to perform the deburring process reliably and with as little effort as possible, the tool contains at least one inner flow-enhancing agent channel, from which at least one cutoff channel extends, which joins in the area of the cutting head in an outer circumferential surface thereof preferably at a circumferential distance to the at least one cutting edge. Because the diameter of the cutting head is selected such that it can be introduced into the recess with radial play, the feeding of pressurized flow-enhancing agent leads to a radial excursion of the tool shaft.

Description

BACKGROUND OF THE INVENTION FIELD OF THE INVENTION

The invention relates to a preferably rotationally driven tool for deburring bore holes, which join laterally into a substantially cylindrical recess, according to the preamble of patent claim 1. The invention furthermore relates to a device and a method for deburring such bore holes, wherein a tool according to the invention should be employed.

DISCUSSION OF THE BACKGROUND

The deburring of bore holes, which join laterally into a substantially cylindrical recess, represents a great problem. Such bore holes are, for example, indispensable in the field of automotive engineering—in the case of radial bore holes that join into a central axial bore of the cam shaft or the crankshaft—and in mobile hydraulics when e.g. a valve piston that is seated in a central bore is supposed to be selected via control connections in the form of radial channels. Since these radial channels generally have to be produced in a bore processing operation, even the special design of the boring tool cannot exclude the fact that a burr or a partial chip remains in the area in which the radial channel joins into the central bore hole recess.

Apart from the fact that this chip influences flow behavior and thus the adjustment and function of the corresponding hydraulic control, the particular problem consists of the fact that such a chip is torn off after a certain amount of time and causes severe damage in the system unless it is removed before start-up.

Therefore, attempts have been made for quite some time (and also with increasingly sensitive control engineering with increasing expenditures) to remove these remaining chips as completely as possible from the radial channel port area. Specially designed tools have been used, with which the cutting head situated on the shaft can be guided towards the chip that is supposed to be removed with as accurate a positioning as possible. The necessary high degree of precision however leads to a considerably increase in cost for the manufacturing process.

SUMMARY OF THE INVENTION

An object of the invention is therefore based on the task of making a tool and a device as well as a method available, with which it is possible to perform the deburring process in a considerably more economical, yet in a reliable and flawless manner. This task is resolved with regard to the tool by the features claimed hereinafter.

According to the invention, a flow-enhancing agent, which is already available in conventional machining centers and is under pressure, such as a coolant and lubricant that is used in machining processing, is used to cause a radial excursion of the cutting head of a tool with a very simple design, which is guided into the recess with relatively little precision, so that the cutting head, which performs a relative rotational movement with regard to the work piece and is driven e.g. in a rotating manner, performs a kind of “rotating” or “gyratory” trimming or cutting motion along the port opening of the radial channel. During this excursion, the impulse forces generated both by the dynamic pressure of the flow-enhancing agent in the area of the cutting head and by the deflection of the flow-enhancing agent current play a role.

The blade of the tool moves on a cycloid path in relation to the recess in the work piece. It has been proven that it is possible this way to remove the burr and/or possibly existing remaining chips in a smooth and yet reproducible and reliable manner, without running the risk of creating further chip formation in other areas. Because the contact area of the tool is constantly rinsed with a pressurized flow-enhancing agent, the machining effect is increased even more. Via the pressure of the flow-enhancing agent and/or the shape of the tool shaft, the radial excursion of the tool shaft can be controlled within a large range so that also the radial play of the cutting head in the recess can be specified in relatively rough terms. This makes the tool less expensive. However, the control unit for the driving device, in which the tool is seated, can also be simplified drastically, since the tool can be positioned in relatively rough terms in relation to the axis of the recess. This allows the tool to be inserted into machines that operate with relatively little precision. Due to the shaving motion on the inner circumference of the recess it positions itself. It was found that the working principle of the invention can be applied to all conventional tools, i.e. for steel, gray cast iron all the way to plastics.

Basically a single cutoff channel suffices for generating a pressure in the area between the port opening and the inner wall of the recess that leads to a sufficient radial excursion of the tool for allowing the cutting edge to engage effectively. It was furthermore proven that it is even possible to adjust the pressure of the flow-enhancing agent to the diameter of the cutoff channel such that the cutoff channel emits a flow-enhancing agent jet that has the function of a cutting jet as known from so-called “water cutters”, i.e. with which a machining operation can be performed. In other words, the stream emitted from the port opening can be used for deburring purposes, independent from the excursion function of the tool shaft, even for lubricating agent pressure values in today's common range of 30 bar and more.

A particularly effective way of machining results from a multitude of cutoff channels which permit a more efficient and faster machining process. This modification furthermore allows several cutting edges to be attached to the cutting head so that the required machining time can be further reduced.

When several cutoff channels are provided, whose port openings are staggered in the axial direction, the above-addressed “cutting jet effect” can be utilized across a greater axial length, which further promotes a reduction in machining time.

It has been proven that particularly beneficial results can be accomplished with dimensions of the cutoff channel when the diameter of the cutoff channels is in the range of 0.1 to 5 mm.

The radial flexibility of the tool can be easily controlled via the length of the shaft, resulting in the beneficial side effect that a long shaft causes the tool to be employed more universally, i.e. for deburring bore holes that join into the recess relatively far inside. The application range is preferably in the range of 5 to 1000 mm for shaft lengths.

A further development according to the present invention allows the necessary radial flexibility of the shaft to be improved further.

As a result of another feature of the present invention, several interior flow-enhancing agent channels are provided, such that more possibilities arise for the configuration of the port openings on the outer circumferential surface of the cutting head.

The port openings can be located in the area of a cutting edge so that the space between the port opening and the inner wall of the recess is as small as possible. It has been shown however that the port openings can also be located in the area of a groove base between two adjacent cutting edges when the flow-enhancing agent pressure is selected sufficiently high so as to generate a large enough dynamic pressure force.

The cutoff channel can basically be aligned randomly and also have a bent course, for example have a helical shape. Preferably the at least one cutoff channel is designed in a straight line, wherein it can be formed either by a bore or by an eroded recess. In the latter case, greater flexibility remains for the design of the channel cross-section.

When the angle of the cutoff channel to the axis of the tool is selected in the range from 5 to 175, preferably between 25 to 155°, particularly between 40 and 50°, the flow loss can be controlled.

When the at least one cutting edge is tilted at an angle to an axial plane of the tool, the cutting conditions during deburring can be influenced directly, improving accuracy of the operation.

With a further development of the present invention, the introduction of the tool is simplified even more.

Good results were obtained with a radial play between the cutting head and the interior wall of the recess in the range of 0.1 and 0.5 mm, wherein this play is coupled to the amount of the operating pressure of the flow-enhancing agent. However values for the play up to 5 mm can also be controlled.

There are practically no restrictions in the material selection of the tool. The tool can be produced from wear-resistant steel, high-speed steel (HSS), hard metal or cerement, wherein also suitable coatings can be applied.

A further development according to present invention permits the tool to be turned into a unit that can be easily handled and inserted into conventional tool holding fixtures.

According to another feature of the present invention, a particular advantage arises from the fact that in the tool the interface to the flow-enhancing agent connection can be easily established.

A particularly simple and cost effective variation is the object of the present invention, according to which the fastening and fixation body simultaneously forms the body for feeding the flow-enhancing agent. The body preferably takes on the shape of a simple elongated hollow cylinder, which can even be glued to the shaft of the tool. When equipped with a suitable corrosion-resistant coating, this body can be produced from conventional steel because the fixation in the tool holding fixture can occur by pressing the cylindrical body against a shoulder surface in the tool holding fixture via the flow-enhancing agent pressure applied onto the back.

The tool can be designed as milling, boring, particularly deep hole boring, straight-fluted boring or twist drill tool or as reamer.

A beneficial embodiment of the device for deburring bore holes, which join laterally into a substantially cylindrical recess, is a further object of the present invention. The rotational drive device can be formed by a simple turning or drilling machine or a robot. In both cases machines that operate at relatively low accuracy suffice.

It has been shown that the flow-enhancing agent itself can be formed by a gaseous medium, e.g. air, in order to generate the necessary forces for causing an excursion of the tool shaft. Of course all conventional coolants and lubricants can be employed, also such of reduced quantity lubrication.

The device preferably operates with a flow-enhancing agent pressure in the range of 3 to 3000 bar.

When the tool contains a fastening and fixation body according to another aspect of the present invention, it is beneficial when it is seated in the tool holding fixture in a type of bayonet lock.

One particular aspect of the present invention consists of the fact that the—relatively high—flow-enhancing agent pressure is used to fixate the tool axially and in the circumferential direction in the tool holding fixture. It has been proven that the cutting forces during deburring can easily be absorbed by the frictional force that arises when the fastening and fixation body is pressed against a fastening shoulder by the flow-enhancing agent pressure. This is facilitated further by equipping the fastening and fixation body with a larger diameter than the cutting head.

A further development according to the present invention results in an effective quick clamping device for the tool with simple components.

The essential elements of the invented method for deburring bore holes, which join laterally into a substantially cylindrical recess, are the object of the present invention. The basic principle consists of the fact that the flow-enhancing agent pressure of the tool inserted into the recess is used to generate a radial excursion of the cutting head and thus allow the at least one cutting edge to engage with the chip that is to be removed.

Further beneficial embodiments are the objects of the remaining dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

Several examples of the invention are described below in more detail based on diagrammatic drawings, wherein: [0034]
FIG. 1 is a diagrammatic side view of a tool according to the invention based on a first embodiment; [0035]
FIG. 2 illustrates detail “II” in FIG. 1; [0036]
FIG. 3 is a diagrammatic sectional view taken along line III-III in FIG. 2; [0037]
FIG. 4 is a diagrammatic side view of another embodiment of the tool of the invention; [0038]
FIG. 5 shows the view taken along line “V” in FIG. 4; [0039]
FIG. 6 is a diagrammatic partial view of a variation of the tool according to FIG. 1 with an indicated holding fixture and fixation in a tool holding fixture; [0040]
FIG. 7 illustrates the view taken along line “VII” in FIG. 6; [0041]
FIG. 8 is a diagrammatic view of the positions of the tool of the invention before and during the machining operations; and [0042]
FIGS. 9 and 10 show variations of the design of the cutting head.[0043]

DESCRIPTION OF THE PREFERRED EMBODIMENTS

In FIG. 1, [0044] reference number 10 designates a rotationally driven, preferably rotationally, symmetrical finishing lathe referred to as a deburring tool in the embodiment described hereinafter, which makes it possible to deburr bore holes 12, which open laterally into a substantially cylindrical recess 14 in a workpiece 18, on their radially inner ends 16 in a particularly economical and reliable way. However it should be pointed out already here that the tool can also be static and instead of this or in addition, the work piece is put into a rotational movement. Furthermore the tool can also be used for deburring the port openings of the recess 14.
The tool is designed for example as a milling, boring, particularly deep hole boring, straight-fluted boring or twist drill tool or as a reamer. The decisive factor is that it includes at least one [0045] cutting edge 20*, which can perform machining processing.
On the tool, a cutting [0046] head 22, which contains a variety of cutting edges 20*, is located on a shaft 20, wherein these edges extend in the axial direction at least in some sections, as shown in FIGS. 2 and 3.
The tool contains an inner flow-enhancing [0047] agent channel 24, from which several cutoff channels 26 extend in the area of the cutting head. These cutoff channels are arranged such that in the area of the cutting head 22 the channels join into an outer circumferential surface thereof with port openings 28. As shown in FIG. 2, the cutting edges are distributed across the entire circumference so that the port openings 28 are at a circumferential distance to at the least one cutting edge 20*, for example the diametrically opposite cutting edge. FIGS. 1 through 3 furthermore show that the diameter DS of the cutting head 22 is selected such that is can be introduced into the recess 14 with radial play SR. The radial play is preferably up to several 1/10 mm and is in the range of e.g. 0.1 to 5 mm. This set-up of the tool allows the following operating principle with the following effects (as described based on FIG. 8) to be realized.
The [0048] tool 10 is fastened in a torque-resistant and slide-resistant manner in a tool holding fixture 30 for realization of the rotational drive. The tool holding fixture is assigned a rotational drive 32, a feed drive 34 and a flow-enhancing agent pressure source 36. The feed drive and/or the rotational drive can also be provided for the work piece 18. For the work piece 18, an additional rotational drive and/or feed drive can also be provided.
When the radial bore [0049] 12 is supposed to be deburred in the radially inner port area, the tool 10 is initially moved closer to the recess 14 (depiction shown as dash-dotted line). Due to the radial play SR, positioning can occur with relatively high inaccuracy, which permits the use of machines operating with relatively high degrees of inaccuracy.
Afterwards the rotational drive and the feed drive are actuated so that the tool is moved into the recess so far (or an appropriate kinematically reversed motion) that the [0050] port opening 16 is reached. It is at the latest when the front cutting edge 20* has reached this point (dash-two-dotted position), that the flow-enhancing agent, for example, water or another tool coolant and lubricant or also a gaseous flow-enhancing agent is fed into the inner flow-enhancing agent channel 24 at a relatively high pressure of 3 to 3000 bar. Therefore, through interaction with the inner circumferential wall of the recess 14, an accordingly large dynamic pressure, as indicated by the small arrows in FIG. 8, builds up in the area of the port openings 28. In addition, due to the impulse caused by the flow-enhancing agent deflection, a radial excursion force is applied onto the cutting head 22.
The multitude of [0051] port openings 28 is distributed unevenly across the periphery in such a way that the sum of the dynamic pressure forces generated in the area of the port openings 28 between the cutting head 22 and the inner wall of the recess 14 can move the shaft 20 in the radial direction so that the cutting edge opposite the resulting dynamic pressure force comes in contact with the burr that is supposed to be machined at the point 16 and cuts or trims along this point. In other words, the tool at this moment performs a circular movement that is superimposed to the rotational movement with a radius of the radial play SR.
Each time a [0052] port opening 28 reaches the radial bore and moves across it, an energy-rich cutting jet is built up, which leads to an additional machining operation of the critical point 16. The deburring process is thus performed very effectively.
As shown in FIGS. 1 through 3, the [0053] cutoff channels 26 are arranged such that their port openings 28 are staggered in the axial direction. However this is not absolutely necessary. The cutoff channels 28 for example have a diameter or an inside diameter from 0.1 to 5 mm.
The above description clarifies that the dynamic pressure forces at the specified pressure values of the flow-enhancing agent are large enough to cause a sufficiently far excursion of the [0054] flexible shaft 20. The elastic deformation can be controlled via the length of the shaft, which can be in the range from 5 to 1000 mm. The figure shows that the shaft 20 is tapered in relation to the diameter DS of the cutting head 22.
The [0055] port openings 28 can be in the area of a cutting edge 20* and/or in the area of a groove base between two adjacent cutting edges. FIG. 3 shows that the cutoff channels 26 have a straight design. These channels can be formed by a bore or by an eroded recess.
The angle WN, by which the [0056] cutoff channel 26 is tilted to the axis 38 of the tool 10, is preferably in the range from 5 to 175°, preferably from 25 to 155°, particularly preferred is the range between 40 and 50°. Other angles however can also be used. Although in the depicted embodiment the cutting edges 20* are shown at a certain angle to the axial plane EA of the tool 10, this is not absolutely necessarily required.
As is shown furthermore in FIGS. 1 through 3 and [0057] 8, the cutting edge 22 has a gate 40, which preferably is formed by a chamfer or a rounded section for example in a ball shape.
The tool can consist of wear-resistant steel, high-speed steel (HSS), hard metal or cerement and be equipped with a suitable, conventional coating. In the above-described tool, not only the [0058] points 16 can be deburred, but also the points 17 and 19 located in the area of the bore 14.
The following describes how the tool is fixated in the [0059] tool holding fixture 30 so as not to rotate and slide. Initially FIGS. 6 and 7 are referenced, where a variation of the tool according to FIGS. 1 through 3 is indicated. A fastening and fixation body referenced with the number 44 in FIGS. 1 through 3, which is one piece together with the shaft 20, is designed as a glued-on cylindrical sleeve 144 in the embodiment according to FIG. 6. With regard to the remaining features, the tool 110 corresponds to the tool 10. Those components of the embodiment according to FIG. 6, which correspond to the components of the tool according to FIGS. 1 through 3, have been marked with the same references, preceded by a “1”:
The [0060] sleeve 144 consists of conventional steel, to which preferably a corrosion protection coating has been applied. In addition to adhesion, a grub screw, which is not shown, can be used, which connects the sleeve 144 with the shaft 120 in a form-locking manner. Reference number 146 designates the chamfer, via which the fluid-tight connection to the flow-enhancing agent source occurs.
The particular feature of the embodiment according to FIGS. 6 and 7 consists of the fact that the flow-enhancing agent pressure is used for securing the tool in the [0061] seating 130 against rotational movement and as to its axial position.
For this purpose, a [0062] locking plate 150, which can be moved radially against a spring 148 in the end face of the recess 130, is used, in which a keyhole opening 152 is incorporated. When the locking plate 150 is shifted downward with the actuating button 151 against the force of the spring 148 in FIG. 7, the larger circular bore in the locking plate covers the cylindrical recess 165 in the tool holding fixture 130 so that the tool can be introduced into the tool holding fixture from the front. As soon as a shoulder 156 of the sleeve 144 reaches behind the sliding plane of the locking plate 150, the latter can slide upward under the force applied by the spring 148 until it stops at a pin 158. The slot-shaped section of the keyhole opening 152 slides along the outer circumference of the shaft 120. The sleeve 144 is thus caught and secured behind the locking plate.
If therefore, as indicated with the arrows in FIG. 6, the flow-enhancing agent pressure is provided on the rear of the [0063] sleeve 144, the sleeve is pressed against the back of the locking plate with the shaded marked surface 162. This pressure force is sufficiently large to ensure that the tool is prevented from rotating, especially since the cutting edges of the tool do not machine any large chips.
FIGS. 4 and 5 show another modified tool, where the axial and rotatory fixation occurs based on the bayonet fastening. Here again comparable components have been marked with similar reference numbers, preceded by a “2”: [0064]
Here as well the [0065] shaft 220 carries a fastening and fixation body 244 on the side facing away from the slightly modified cutting head 222. W this body, the tool can be fixated in a tool holding fixture against rotational and sliding movements. This body has a substantially rectangular shape and interacts with an undercut recess, which is not shown in detail, in the tool holding fixture, which has the design of a bayonet fastening.
As was already mentioned, the flow-enhancing agent pressure should be raised to relatively high ranges in order to ensure sufficient radial excursion of the tool shaft. The pressure-generating device should be in a position to generate a flow-enhancing agent pressure in the range from 30 to 3000 bar. For certain designs of the tool shaft and/or the adjustment of play between the tool and holding fixture however a pressure below 3 bar can be sufficient. [0066]
The relative speed between the tool and work piece is preferably maintained in the range from 100 to 50,000 RPM, wherein the cutting speed is selected in the range from 20 to 300 m/min. [0067]
FIGS. 9 and 10 show additional variations of the cutting heads [0068] 322 and 422. In the shape according to FIG. 9, the cross-section of the cutting head is nearly rectangular, while the variation according to FIG. 10 shows a clear gate 440. The alignment of the cutoff channels 326, 426 is also modified in FIGS. 9 and 10.
The cutting [0069] head 222 of the variation according to FIG. 4 has the shape of a hemisphere, into which the grooves and cutting edges are incorporated.
Of course deviations from the described embodiments are possible, without leaving the basic idea of the invention. For example several inner flow-enhancing agent ducts can be provided. [0070]
When the tool is relied upon for deburring several bore holes that are staggered in the axial direction, it is beneficial to construct the flow-enhancing agent supply of the tool with increased pressure only when the cutting head reaches the vicinity of the bore hole port that is supposed to be deburred. [0071]
It should, however, also be pointed out that the invention is solely viewed based upon the idea that a flow-enhancing agent under relatively high pressure is used for deburring purposes, be it through “water cutting effects”, i.e. solely through the build-up of a cutting jet or through the pressure force generated by the radially exiting flow-enhancing agent current leading to a radial excursion of the tool shaft, and thus of the cutting head. [0072]
The invention thus creates a preferred rotationally driven tool for deburring bore holes, which join laterally into a substantially cylindrical recess. The tool contains a cutting head seated on a shaft, wherein this cutting head includes at least one cutting edge, which extends in the axial direction at least in some sections. In order to be able to perform the deburring process reliably and with as little effort as possible, the tool contains at least one inner flow-enhancing agent channel, from which a cutoff channel extends, which joins into its outer circumferential surface in the area of the cutting head preferably at a circumferential distance to the at least one cutting edge. Since the diameter of the cutting head is selected such that it can be introduced into the recess with radial play, the feeding of pressurized flow-enhancing agent leads to a radial excursion of the tool shaft. [0073]

Claims

1. (Amended) A rotationally drivable tool for deburring bore holes, including bore holes that join laterally into a substantially cylindrical recess, which comprises:

a cutting head for deburring the bore holes and which comprises a shaft in which the cutting head is seated, wherein the cutting head contains at least one cutting edge, which extends in the axial direction at least on some sections and which due to a relative movement between the tool and workpiece performs a cutting operation;

at least one inner flow-enhancing agent channel, from which at least one cutoff channel extends, which joins in an area of the cutting head in an outer circumferential surface at a circumferential distance to said at least one cutting edge, wherein a diameter of the cutting head is such that said cutting head is introduceable into the recess with radial play.

2. (Amended) Tool according to claim 1, wherein said cutting head has a plurality of cutoff channels formed therein which respectively communicate with a plurality of port openings, which are distributed unevenly across a circumference of the cutting head such that a total of dynamic pressure forces generated in an area of the port openings between the cutting head and the inner wall of the recess applies an excursion force to the cutting head in a radial direction.

3. (Amended) Tool according to claim 1, wherein said at least one cutoff channel comprises a plurality of cutoff channels and wherein such port openings are staggered in an axial direction.

4. (Amended) Tool according to one of claim 1, wherein said at least one cutoff channel has a diameter in a range from 0.1 to 5 mm.

5. (Amended) Tool according to one of claim 1, wherein said at least one cutting edge comprises a plurality of multitude of cutting edges distributed across a circumference.

6. (Amended) Tool according to one of claim 1, wherein said shaft has a length in a range of from 5 to 1000 mm.

7. (Amended) Tool according to one of claim 1, wherein said shaft is tapered in relation to a diameter of the cutting head.

8. (Amended) Tool according to one of claim 1, wherein said at least one flow-enhancing channel comprises a plurality of flow-enhancing agent channels.

9. (Amended) Tool according to claim 2, wherein at least one of said port openings is located in an area of said at least one cutting edge.

10. (Amended) Tool according to claim 2, wherein said at least one cutting edge comprises a plurality of cutting edges and at least one of the port openings is located in an area of a groove base located between two adjacent cutting edges of said plurality of cutting edges.

11. (Amended) Tool according to claim 1, wherein said the at least one cutoff channel comprises a substantially straight lined cutoff channel.

12. (Amended) Tool according to claim 11, wherein said at least one cutoff channel comprises a bore hole formed in said cutting head.

13. (Amended) Tool according to claim 11, wherein said at least one cutoff channel comprises an eroded recess formed in said cutting head.

14. (Amended) Tool according to claim 11, wherein an angle of the cutoff channel formed with respect to the axis of the tool is in the range from 5 to 175°.

15. (Amended) Tool according to claim 1, wherein said at least one cutting edge forms an angle with respect to an axial plane of the tool.

16. (Amended) Tool according to claim 1, wherein the cutting head has a gate, which is formed by one of a chamfer or a rounded section.

17. (Amended) Tool according to claim 1, wherein the radial play is in the range from 0.1 to 5 mm.

18. (Amended) Tool according to claim 1, wherein said cutting head comprises one of wear-resistant steel, a high-speed steel, a hard metal and cerement.

19. (Amended) Tool according to claim 1, wherein said shaft on a side thereof facing away from the cutting head, has connected thereto a fastening and fixation body, with which the tool can be fixed to a tool holding fixture for providing rotational and sliding movements thereof.

20. (Amended) Tool according to claim 1, wherein said shaft, on a side thereof facing away from the cutting head, has a body connected thereto via which the flow-enhancing agent is feedable into the at least one flow-enhancing agent channel.

21. (Amended) Tool according to claim 19 wherein the fastening and fixation body comprises an element for feeding the flow-enhancing agent.

22. (Amended) Tool according to claim 1, wherein said tool comprises one of a milling tool, a boring tool, a deep hole boring tool, a straight-fluted boring tool, a twist drill tool and a reamer.

23. (Amended) Device for deburring bore holes, which join laterally into a substantially cylindrical recess, with a tool according to claim 1, which comprises a rotational drive device for driving said tool and a flow-enhancing agent source for feeding pressurized flow-enhancing agent into the at least one flow-enhancing agent channel.

24. (Amended) Device according to claim 23, wherein the flow-enhancing agent comprises one of a liquid or gaseous coolant and a lubricant.

25. (Amended) Device according to claim 23 which comprises a pressure generating device having a flow-enhancing agent pressure in a range of from 3 to 3000 bar.

26. (Amended) Device according to claim 23, which comprises a tool holding fixture connected to said shaft by fastening and fixation body via a bayonet lock.

27. (Amended) Device for deburring bore holes, which join laterally into a substantially cylindrical recess, according to claim 23, with a tool having a fastening and fixation body with an element for feeding a flow enhancing agent thereto, which comprises a cylindrical body located a side facing away from a cutting head for feeding pressurized flow-enhancing agent, wherein the flow-enhancing agent pressure generates an axially stationary fixation force on the tool for preventing rotational movements in the tool holding fixture.

28. (Amended) Device according to claim 27, wherein the tool holding fixture comprises a cylindrical holding bore for a body for feeding the flow-enhancing agent and a radially adjustable locking body having a keyhole recess, against which a shoulder of the fastening and fixation body is subjected to a pressure force when the flow-enhancing agent pressure is fed into the fastening and fixation body.

29. (Amended) Method for deburring bore holes, which comprises the steps of:

(a) inserting a tool into a recess of a work piece for performing relative rotational movement in relation to the work piece; and

(b) building up a flow of a pressurized flow-enhancing agent through the tool while simultaneously radially moving the cutting head.

30. (Amended) Method according to claim 29, which comprises releasing the flow-enhancing agent so that the flow-enhancing agent exiting at least one port opening of the cutting head generates a cutting jet by which a machining operation is performed.

31. (Amended) Method according to claims 29 or 30, characterized by the following steps:

a) inserting a tool into a recess of a work piece for performing relative rotational movement in relation to a workpiece having the recess

b) building up a flow of the pressurized flow-enhancing agent through the tool simultaneous radial excursing the cutting head.

32. (Amended) Method according to claim 31, which comprises performing a feeding motion during step b) at least by one of the tool and the work piece.

33. (Amended) Method according to one of the claims 29 through 32, which comprises operating the tool and/or the work piece at a speed in a range from 100 to 50,000 RPM.

34. (Amended) Method according to one of the claims 29 through 33, wherein the cutting speed is in the range from 20 to 300 m/min.