DE202017007479U1 - Milling tool for processing wood, wood-based materials, plastics or light metals - Google Patents

Abstract

Milling tool for processing wood, wood-based materials, plastics or light metals, with a processing side (A) and a spindle side (B) and with a first fixed processing tool (1) arranged in a housing (11) rotatable about an axis of rotation (D) and at least one second machining tool (2, 3) which is arranged coaxially to the first machining tool (1) so that it can be displaced between a rest position and a machining position, characterized in that the at least second machining tool (2, 3) is connected to a housing (11 ) about the axis of rotation (D) rotatably arranged cam (7) can be brought into connection.

Description

Milling tool for processing wood, wood-based materials, plastics or light metals, with a processing side and a spindle side and with a first housing arranged to be rotatable about an axis of rotation, fixed processing tool and at least one second processing tool which can be moved coaxially to the first processing tool between a rest position and a processing position is arranged.

Such a milling tool is used for profiling edges and corners on panel-shaped workpieces. When changing the edge band thickness, the profile radius of the milling tool must also be adapted to the edge band thickness. When manufacturing small batches, there are frequent tool changes with production interruptions. For this reason, some solutions with switchable tools have been developed in order to be able to change the profile without removing and installing the tools. Partially even under rotation of the tool.

The milling tool mentioned above is, for example, from the DE 199 15 672 A1 famous. In the case of machining tools arranged coaxially to one another, differently profiled cutting edges are attached. The cutting edge with the largest radius is always in the machining position. To change the profile, a differently profiled cutting edge with a smaller radius is pushed into its machining position and completely covers the profile of the first cutting edge, except for the circumferential profile end. The cutting edge profile is changed by a linear movement of one of the movably arranged processing tools, which is triggered pneumatically. The disadvantage here is that a separate control is required for each movable machining tool, which leads to a complex construction if there are more than two differently profiled cutting edges.

From the DE 10 2013 010 359 A1 a milling tool is known in which the differently profiled cutting edges are brought into their machining position not by axial but by radial displacement. For this purpose, the cutters are arranged on radially displaceable cutter holders and the pneumatically triggered axial movement of the coaxially arranged actuating elements is converted into a radial movement of the cutter holders via beveled cones. With this milling tool, too, each movable machining tool must be controlled separately. The machining tools that are not in the working position must be held back by pneumatic pressure against the acting centrifugal forces, which requires high adjustment forces at high speeds.

At the one from the DE 20 2010 010 704 U1 known milling tool, the individual machining tools are stored individually in the tool head and can be moved axially. As a result, they can be easily moved from a rest position to a processing position. An editing tool is fixed in the editing position. Machining tools that are not required are retracted to their rest position. During processing, the activated processing tool must always be held in its processing position by an external force against cutting pressure and spring restoring forces. Because the individual machining tools are arranged outside of the axis of rotation, speed-dependent centrifugal forces act on the machining tools, which requires very precise storage to prevent the diameter of the cutting edges from expanding under load.

the DE 10 2014 008 033 A1 discloses a milling tool in which differently profiled cutting edges are arranged on rotationally adjustable cutting edge supports. A profile change takes place through a defined synchronous rotational movement of the blade carrier. With this milling tool, it is also possible to change more than three profiles without increasing the complexity.

the DE 74 26 183 U discloses a milling tool which is composed of two tool bodies which are connected to one another in a form-fitting manner and which are approximately symmetrical and carry the cutting edges. The tool bodies are arranged so that they can be moved relative to one another via a threaded spindle.

the US4551165A discloses an automatic blade changer for changing blades on a tool. If a sensor detects wear or chipping on the cutting edges, the cutting edge changer moves the cutting plate out of its cutting position and inserts a new cutting edge.

The ones from the DE 10 2011 004 536 A1 known multi-profile milling device is equipped with a first tool that is in a working position and a second tool that can be brought into a working position. An additional spindle is provided between a sliding cylinder for the second tool and the tool. When the second tool is in the working position, the machining profile of the second tool is superimposed on the machining profile of the first tool in such a way that a workpiece to be machined receives the second machining profile.

the DE 10 2013 226 214 A1 discloses a device for machining a workpiece made of wood, wood-based materials, plastics or the like, which has two milling tools for contour machining an edge of the workpiece. The second milling tool can be adjusted relative to the first milling tool between a rest position, in which the first milling tool can be brought into engagement with the workpiece, and a machining position, in which the second milling tool can be brought into engagement with the workpiece. The edge on the workpiece can be milled flush with a third milling tool, which is arranged coaxially to the other two milling tools.

the DE 20 2015 105 932 U1 discloses a tool for machining an edge of a workpiece, in which at least two cutting edges held on a cutter holder can be moved alternatively into a cutting position by rotating the cutter holder about the holder axis.

Proceeding from this, the invention is based on the object of enabling an automatic profile change of at least two, preferably three or more profiles in a process-reliable manner with the tool stationary without changing the tool.

The object is solved by the independent patent claims. The subclaims specify advantageous refinements.

To solve the problem, the generic milling tool is characterized in that the at least second machining tool can be connected to a cam disk arranged in the housing such that it can rotate about the axis of rotation for displacement in the axial direction.

As a result of this design, the mechanism for changing the profile takes up little space and the milling tool has a simple design. Basically, a large number of second machining tools can be provided. The cam disk, which is provided with cams pointing in the axial direction, can preferably be rotated incrementally. This makes it possible to bring the machining tools into their machining position by means of an axial back and forth stroke movement.

For this purpose, the first machining tool is preferably rigidly connected to a base body which is coupled to the housing in a rotationally fixed manner. In particular, the machining tool is preferably screwed to the base body.

The cam disk can be connected to a sleeve-shaped pressure ring, which has at least one, preferably three, balls (as sliding blocks) protruding radially inward, which runs in a meandering circumferential groove (as a link) of a locking sleeve connected to the housing in a rotationally fixed manner and forms a link guide, wherein the inner diameter of the pressure ring is larger than the outer diameter of the locking sleeve.

The ball or balls are preferably arranged (with play) in a radial bore in the inner wall of the pressure ring and can be adjusted radially towards the locking sleeve preferably via a grub screw.

If the meander runs at an acute angle (zigzag formation), so that the at least one ball can be guided either clockwise or only counterclockwise, no reversal point can occur when the direction of the lifting movement is reversed. For this purpose, an overlap in the running direction of the ball is preferably provided at the reversal points of the groove.

The cam disk is preferably non-rotatably connected to the pressure ring and can be displaced in the axial direction. It is advantageous if at least one compression spring acting in the axial direction is provided between the pressure ring and the base body.

It is also advantageous if each displaceably arranged machining tool has cylindrical pins that are regularly spaced apart on a reference circle, which run parallel to the axis of rotation and can be brought into operative connection with cams arranged on the cam disk. This simplifies the engagement of the cam disk with the respective machining tool.

The at least one compression spring is preferably guided axially in a spring ring and the spring ring is rotatably mounted with respect to the pressure ring via an axial bearing. One or three compression springs are arranged between the stationary machining tool and the displaceable machining tool or tools (at least the second machining tool).

On the spindle side, the pressure ring can be provided with a closed circumferential face that serves as a running surface for a rolling element. This configuration reduces the actuating forces for setting the machining position of the machining tools.

Each machining tool is preferably provided with a plurality of cutting edges, the cutting edges on each individual machining tool being profiled identically, but each of the machining tools being profiled differently has cutting. It is also conceivable that two machining tools have cutting edges that are profiled identically.

The profiles of the cutting edges are preferably radii or chamfers and the fixed machining tool carries the cutting edge with the largest radius.

If the pressure ring is provided with markings for the respective cutting edges on the spindle side, which can interact with a marking in the housing, depending on the rotational position of the pressure ring, the active cutting edge profile can be indicated and made visible to the viewer.

A machining device that is provided with a tool designed according to the invention has an axially movable actuating device with which a disengagement movement and a return stroke can be carried out, and which has at least one pressure element and one rolling element. The pressure element is preferably a spring-loaded bolt and the rolling element is a ball roller.

• 1 - ein Fräswerkzeug in Explosionsdarstellung;
• 2 - eine weitere Explosionsdarstellung des Fräswerkzeuges nach 1;
• 3 - die perspektivische Darstellung des Fräswerkzeuges mit Betätigungseinrichung von der Bearbeitungsseite;
• 4 - die perspektivische Darstellung des Werkzeugs mit Betätigungseinrichtung von der Spindelseite;
• 5 - den Axialschnitt durch das Fräswerkzeug;
• 6 - eine Explosionsdarstellung der Verstellmechanik;
• 7 - Die Verstellmechanik im Halbschnitt
• 8 - eine perspektivische Schnittdarstellung durch das Fräswerkzeug von der Bearbeitungsseite;
• 9 - eine perspektivische Schnittdarstellung durch das Fräswerkzeug von der Spindelseite;
• 10 - eine Schnittdarstellung des Fräswerkzeugs mit dem sich in Bearbeitungsposition befindlichen feststehenden Bearbeitungswerkzeug;
• 11 - die Darstellung des Werkzeugs während der ersten Phase eines Profilwechsels im Axialschnitt;
• 12 - die Darstellung nach 11 während einer zweiten Phase eines Profilwechsels;
• 13 - die Darstellung des Werkzeugs nach 11 während einer dritten Phase;
• 14 - die Darstellung des Werkzeugs nach 11 während einer vierten Phase;
• 15 - die Darstellung des Fräswerkzeugs nach 11 nach Beendigung eines Profilwechsels;
• 16 - die perspektivische Darstellung des Fräswerkzeugs ohne Grundkörper und Gehäuse;
• 17 - die Seitenansicht des Fräswerkzeugs nach 16;
• 18 - die Darstellung des Fräswerkzeugs nach 16 mit dem ersten verschiebbar angeordneten Bearbeitungswerkzeug in Bearbeitungsposition;
• 19 - die Seitenansicht des Fräswerkzeugs nach 18;
• 20 - die Darstellung des Fräswerkzeuges nach 16 bzw. 18 mit dem zweiten verschiebbar angeordneten Bearbeitungswerkzeug in Bearbeitungsposition;
• 21 - die Seitenansicht des Werkzeugs nach 20;
• 22 - die Prinzipdarstellung eines Profilwechsels.

An exemplary embodiment of the invention will be described below with the aid of a drawing. Show it:

• 1 - a milling tool in exploded view;
• 2 - another exploded view of the milling tool 1 ;
• 3 - The perspective view of the milling tool with actuating device from the processing side;
• 4 - The perspective view of the tool with actuating device from the spindle side;
• 5 - the axial cut through the milling tool;
• 6 - An exploded view of the adjustment mechanism;
• 7 - The adjustment mechanism in half section
• 8th - A perspective sectional view through the milling tool from the processing side;
• 9 - A perspective sectional view through the milling tool from the spindle side;
• 10 - A sectional view of the milling tool with the machining position located in the fixed machining tool;
• 11 - the representation of the tool during the first phase of a profile change in axial section;
• 12 - the representation after 11 during a second phase of a profile switch;
• 13 - the appearance of the tool 11 during a third phase;
• 14 - the appearance of the tool 11 during a fourth phase;
• 15 - the representation of the milling tool 11 after completing a profile switch;
• 16 - The perspective view of the milling tool without body and housing;
• 17 - the side view of the milling tool 16 ;
• 18 - the representation of the milling tool 16 with the first displaceably arranged machining tool in the machining position;
• 19 - the side view of the milling tool 18 ;
• 20 - the depiction of the milling tool 16 or. 18 with the second displaceably arranged machining tool in the machining position;
• 21 - the side view of the tool 20 ;
• 22 - the principle of a profile change.

The milling tool according to the invention consists of a base body 4 which carries a first machining tool 1 with a first cutting profile 31 and at least one second axially displaceable machining tool 2 with a second cutting profile 32 which is firmly connected via screws 29 . The base body 4 is designed with a flange area 30 with bores for receiving machining tools 1, 2, 3 and with an interface for attachment to a rotatable drive (machine spindle, not shown), e.g. B. a bore 25, advantageously with a conical bore for backlash-free centering. On the circumference, the milling tool is closed by a housing 11, which is connected to the base body 4 in a rotationally fixed and axially displaceable manner via grub screws 40, which engage in corresponding grooves 44 in the base body 4 (cf. 5 ).

The exemplary embodiment shown has a tool 1 which is screwed firmly to the base body 4 and has a cutting edge profile 31 and two axial displaceable machining tools 2, 3, each with a cutting edge profile 32, 33, which are guided on different coaxially arranged cylinder surfaces of the base body 4. The displaceable machining tools 2 , 3 are braced in the axial direction relative to the fixed tool 1 by means of springs 26 , 27 , and they are connected to the base body 4 in a rotationally fixed and axially displaceable manner by means of cylinder pins 37 , 38 . The cylinder pins 37, 38 pass through the bores 37.1, 38.1 in the flange of the base body 4 in order to interact with a cam disk 7. The axially displaceable machining tools 2 , 3 are pressed away from the fixed tool 1 by the springs 26 , 27 . The cam disk 7 , which projects in the axial direction, has cams 17 , is rotatably mounted in the base body 4 and is axially fixed by a retaining ring 10 .

The axial position of the movable machining tools 2, 3 is changed by the angular position of the cam disk 4 between a working position and a rest position. If the position of the cams 17 is such that none of the machining tools 2, 3 is in contact with the cams 17 via the cylindrical pins 37, 38, both axially displaceable machining tools 2, 3 are in contact with their flat back surface 39 on the base body 4 and the cutter profiles 32, 33 are outside of the processing position (in rest position). The fixed processing tool 1 is in the working position. If the position of the cam 17 is such that one of the two axially displaceable machining tools 2, 3 rests with its cylindrical pins 37, 38 on the cam 17 of the cam disk 7, then this machining tool 2, 3 is in the working position with its cutting edge profile.

Advantageously, the different edge profiles (radii and chamfers) to be generated are distributed over the processing tools 1, 2, 3 in such a way that the fixed processing tool 1 has the largest profile radius and the smaller profile radii and chamfer profiles are assigned to the axially displaceable processing tools 2, 3. If all blade profiles 31, 32, 33 are designed so that they have the same reference point for the "glue joint" in the working position, the profile of the fixed processing tool 2, 3 is always overlapped by the profile of an axially displaceable processing tool 1, so that only this axially displaceable processing tool 2, 3 profile.

The cam disk 7, together with the locking sleeve 5 and the pressure ring 9, forms the actual adjustment mechanism for the profile change. For this purpose, the locking sleeve 5 is firmly connected to the housing 4, z. B. via grub screws 34. On its periphery, the locking sleeve 5 has a circumferential, essentially zigzag groove 18, which serves as a backdrop for a link guide. The groove 18 has a semicircular cross-section and serves as a raceway for at least one ball 19. On the circumference, the locking sleeve 5 interacts with a pressure ring 9, which is movably connected to the locking sleeve 5 via at least one ball 19, preferably three balls, via the groove 18 . The movement between the locking sleeve 5 and the pressure ring 9 is positively guided by the meandering shape of the groove 18 . The pressure ring 9 is in turn connected to the cam disk 7 in a rotationally fixed and axially displaceable manner via projections 15 which engage in grooves 16 thereof.

To carry out a profile change, when the milling tool is at a standstill, an actuating device 21 arranged on the drive side presses in the axial direction onto the housing 11 and the pressure ring 9 . The actuating device 21 is arranged on the spindle side and is connected via bores 23 to a linear movement unit, e.g. B. a pneumatic piston (not shown). In the direction of the milling tool, the actuating device 21 has at least one spring-loaded bolt 35 which acts on the housing 11 and at least one rolling element 36 which is located radially further inwards and which acts on the pressure ring 9 . In the contact area of the at least one rolling element 36, the pressure ring 9 has a continuous running surface running all the way around. In the machining state, there is no contact between the actuating device 21 and the milling tool (gap), so that the milling tool can be driven in rotation.

To carry out a profile change, the rotating milling tool is first stopped. Four phases can be distinguished in the profile change.

In phase 1, the housing 11 is first pushed by the release movement of the actuating device 21 via the spring-loaded bolts against the force of the springs 26, 27 in the direction of the processing side A. The housing 11 entrains the two axially displaceable machining tools 2, 3 via its end face until they strike the stationary machining tool 1, so that the cylinder pins 37, 38 move outside the contact area with the cam disk 7 and there is no longer any contact between the planar back surface 39 and the base body 4 consists. For this purpose, the total spring force of the spring-loaded bolts 35 must be greater than the total spring force of the springs 26, 27. In this state, the cam disk 7 is unloaded, which reduces the friction during its subsequent rotational movement. During this phase, the spring-loaded bolts 35 are not compressed.

In phase 2, the rolling element 36 presses against the running surface of the pressure ring 9 and also displaces it axially in the direction of the processing side A. The spring-loaded bolts 35 give way in the process. Since the housing 11 is locked in a non-rotatable manner via the contact with the spring-loaded bolt 35 and the housing 11 is in turn coupled non-rotatably to the base body 4 and the locking sleeve 5 via a form fit, axial pressure on the pressure ring 9 causes a rotary movement of the pressure ring 9 via the link guide forced until the at least one ball 19 reaches the machining-side reversal point of the slotted guide. The rotational movement of the pressure ring 9 is transmitted to the cam disk 7 via the positive-locking elements 15 , 16 . The cams 17 assume a different position in relation to the machining tools 2, 3.

Phase 3 begins with the return stroke movement of the actuating device 21 . The rotational movement of the pressure ring 9 and the cam disk 7 is now brought about by the spring force of the springs 28 and continues until the at least one ball 19 reaches the spindle-side reversal point of the connecting link. In this position, the pressure ring 9 and with it the cam disk 7 are locked.

In phase 4, the axially displaceable machining tools 2, 3 are shifted in the direction of the spindle side B with the aid of the springs 26, 27 until, depending on the position of the cam disk 7, they either come into contact with their cylinder pins 37, 38 on the cam 17 of the cam disk 7 or with their flat back surface 39 rest against the base body 4.

After the end of the profile change, the actuating device 21 no longer has any contact with the tool (gap).

The essentially zigzag groove 16 of the locking sleeve 5 is designed in such a way that the cam disk 7 always rotates in incremental steps in the same direction - i.e. either clockwise or counterclockwise - so that after the end of an actuation cycle consisting of release and return movement (Back and forth stroke), the cams 17 of the cam disk 7 are in a different angular position relative to the machining tools 2, 3. For this purpose, the essentially zigzag-shaped groove 16 of the locking sleeve 5 (link guide) has an overlap at the reversal points in the direction of movement of the ball 19, so that no dead center can occur when the lifting movement reverses and the at least one ball 19 runs through the link guide in one direction.

In a preferred embodiment, the inclined areas of the essentially zigzag groove 16 have different gradients. In such an embodiment, an overlap of the zigzag groove 16 is only required at the turning points from the large to the small pitch. An embodiment is advantageous in which the groove areas in the direction of the disengagement movement triggered by the actuating device 21 have a greater slope than the groove areas in the direction of the return movement triggered by the springs 28 . Due to the different gradients, the frictional resistance can be adapted to different forces during the release and return stroke movement and the wear on the connecting link can be reduced. An embodiment in which the gradient of the groove regions, which run more steeply, decreases degressively in the direction of movement of the ball 19 is particularly advantageous. With such a groove profile, the force impulse can be reduced in the event of a sudden release movement and the wear on the link guide can be minimized.

The division of link guide and cams or cylinder pins 37, 38 is appropriately matched to one another in such a way that a different tool is brought into the working position after each actuation cycle. Because of the prestressing by the springs 28 and the zigzag shape of the groove 16, the device snaps into the new position after each switching cycle (profile change).

The pressure ring 9 changes its angular position in relation to the housing 11 after each switching operation. Since each angular position can be clearly assigned a cutting edge profile 31, 32, 33, the angular position of the pressure ring 9 relative to the housing 11 can be used to indicate the active cutting edge profile 31, 32, 33 be used on the spindle side B of the milling tool by z. B. an indexing mark 43 is attached to the housing 11 and different marks 42 for the different cutting edge profiles 31, 32, 33 are attached to the pressure ring 9, so that the profile marking opposite the indexing mark always indicates the active cutting edge profile 31, 32, 33 (principle "parking disc"). This possibility of recognizing the active cutter profile 31, 32, 33 is necessary in particular for referencing the machine control during initial start-up or after faults. The markings 42 applied on the spindle side are clearly visible from the operator's side, while the blade profiles 31, 32, 33 are generally not accessible because they are covered by a suction hood.

Switching cycle for profile change:

1. 1. Mal Schalten durch axiales Drücken der Betätigungseinrichtung 21 Bearbeitungswerkzeug 2 in Arbeitsposition -» Bearbeitungswerkzeug 2 vorgeschoben 3 zurückgestellt
2. 2. Mal Schalten durch axiales Drücken der Betätigungseinrichtung 21 Bearbeitungswerkzeug 3 in Arbeitsposition -» Bearbeitungswerkzeug 3 vorgeschoben 2 zurückgestellt
3. 3. Mal Schalten durch axiales Drücken der Betätigungseinrichtung 21 Bearbeitungswerkzeug 1 wieder in Arbeitsposition.

Machining tool 1 in working position -» Machining tools 2 and 3 are on hold

1. 1st time switching by axially pressing the actuating device 21 Machining tool 2 in working position -> Machining tool 2 advanced 3 reset
2. 2nd time switching by axially pressing the actuating device 21 Machining tool 3 in working position -> Machining tool 3 advanced 2 reset
3. 3rd time switching back to the working position by pressing the actuating device 21 axially.

Reference List

1

First editing tool (fixed)

2

Second processing tool (axially movable)

3

Third machining tool (axially movable)

4

body

5

locking sleeve

6

spring washer

7

cam disk

8th

thrust bearing

9

pressure ring

10

locking ring

11

housing

12

screw

13

ring

14

locking ring

15

head Start

16

groove

17

cam

18

groove (backdrop)

19

bullet

20

grub screw

21

actuating device

22

body

23

mounting hole

24

Threaded hole (for grub screw)

25

Bore (interface to machine spindle)

26

feather

27

feather

28

feather

29

screw

30

flange area

31

first cutting profile

32

second cutting profile

33

third cutting profile

34

grub screw

35

Spring-loaded bolt (compression element)

36

rolling element ("ball caster")

37

straight pin

37.1

drilling

38

straight pin

38.1

drilling

39

flat contact surface

40

grub screw

41

tread

42

Marking to identify the cutting edge profile

43

Mark to index the cutting edge profile

44

groove

A

editing page

B

spindle side

D

axis of rotation

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 19915672 A1 [0003]
• DE 102013010359 A1 [0004]
• DE 202010010704 U1 [0005]
• DE 102014008033 A1 [0006]
• DE 7426183 U [0007]
• US4551165A [0008]
• DE 102011004536 A1 [0009]
• DE 102013226214 A1 [0010]
• DE 202015105932 U1 [0011]

Claims (18)

Milling tool for processing wood, wood-based materials, plastics or light metals, with a processing side (A) and a spindle side (B) and with a first fixed processing tool (1) arranged in a housing (11) rotatable about an axis of rotation (D) and at least one second machining tool (2, 3) which is arranged coaxially to the first machining tool (1) so that it can be displaced between a rest position and a machining position, characterized in that the at least second machining tool (2, 3) is equipped with a housing (11 ) about the axis of rotation (D) rotatably arranged cam (7) can be brought into connection. milling tool claim 1 , characterized in that at least two machining tools (2, 3) are provided which are displaceable between a rest position and a machining position. milling tool claim 1 or 2 , characterized in that the cam disc (7) is incrementally rotatable. Milling tool according to one of the preceding claims, characterized in that the machining tool (1) is rigidly connected, preferably screwed, to a base body (4) which is non-rotatably coupled to the housing (11). milling tool claim 3 or 4 , characterized in that the cam disk (7) is connected to a sleeve-shaped pressure ring (9) which has at least one, preferably three, balls (19) protruding radially inwards as a sliding block, which are in a meandering circumferential groove (18) a locking sleeve (5) which is connected to the housing (11) in a rotationally fixed manner, as a connecting link, with the inner diameter of the pressure ring (9) being larger than the outer diameter of the locking sleeve (5). milling tool claim 5 , characterized in that the ball (19) is arranged with play in a radial bore (24) in the inner wall of the pressure ring (9). milling tool claim 5 or 6 , characterized in that the meander runs at an acute angle, the at least one ball (19) being able to be guided either only in a clockwise direction or only in a counter-clockwise direction. Milling tool according to one of Claims 5 until 7 , characterized in that the cam disc (7) is non-rotatably connected to the pressure ring (9) and is displaceable in the axial direction. Milling tool according to one of Claims 5 until 8th , characterized in that at least one compression spring (28) acting in the axial direction is provided between the pressure ring (9) and the base body (4). Milling tool according to one of the preceding claims, characterized in that each displaceably arranged machining tool (2, 3) has cylindrical pins (37, 38) arranged at regular intervals on a reference circle, which run parallel to the axis of rotation (D) and are mounted on the cam disk (7) arranged cams (17) can be brought into operative connection. milling tool claim 9 , characterized in that the at least one compression spring (28) is guided axially in a spring ring (6) and the spring ring (6) is rotatably mounted to the pressure ring (9) via an axial bearing (8). Milling tool according to one of the preceding claims, characterized in that at least one, preferably three, compression springs (26, 27) are arranged between the stationary machining tool (1) and the displaceable machining tool or tools (2, 3). Milling tool according to one of Claims 5 until 12 , characterized in that the pressure ring (9) is provided on the spindle side with a closed circumferential end face which serves as a running surface (41) for a rolling element (36). Milling tool according to one of the preceding claims, characterized in that each machining tool (1, 2, 3) is provided with a plurality of cutting edges (31, 32, 33) and the cutting edges (31, 32, 33) on each individual machining tool (1 , 2, 3) are profiled identically, but each of the machining tools (1, 2, 3) has differently profiled cutting edges (31, 32, 33). milling tool Claim 14 , characterized in that the profiles of the cutting edges (31, 32, 33) are radii or chamfers and the fixed machining tool (1) carries the cutting edge (1.1) with the largest radius. milling tool Claim 14 or 15 , characterized in that the pressure ring (9) is provided on the spindle side with markings (42) for the respective cutting edges (31, 32, 33) which interact with a marking (43) in the housing (11) and depending on the rotational position of the pressure ring (9) index the respective cutting edges (31, 32, 33) located in the machining position. Machining device with a milling tool according to one of the preceding claims and an axially movable actuating device (21) with which a disengagement movement and a return stroke can be carried out, and which has at least one pressure element (35) and one rolling element (36). processing device Claim 17 , characterized in that the pressure element (35) is a spring-loaded bolt and the rolling element (36) is a ball roller.

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