EP3470190A1 - Milling tool for machining wood, wooden materials, plastics or light metals - Google Patents

Abstract

The invention relates to a milling tool for machining wood, wood-based materials, plastics or light metals, with a machining side (A) and a spindle side (B) and with a first fixed machining tool arranged in a housing (11) rotatable about a rotation axis (D) (1), and at least one second machining tool (2, 3) which is arranged coaxially with the first machining tool (1) displaceable between a rest position and a machining position. According to the invention, it is provided that the at least second machining tool (2, 3) can be brought into contact with a cam disk (7) which can rotate in the housing (11) so as to be rotatable in the axial direction (D).

Description

Milling tool for machining wood, wood-based materials, plastics or light metals, with a machining side and a spindle side and with a first, rotatable about a rotation axis housing, stationary machining tool and at least a second machining tool, the coaxial with the first machining tool between a rest position and a machining position displaced is arranged.

Such a milling tool is used for profiling edges and corners on plate-shaped workpieces. When changing the edge strip thickness, the profile radius of the milling tool must also be adapted to the edge strip thickness. When producing small batch sizes, frequent tool changes result with production stoppages. 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 initially mentioned milling tool is for example from the DE 199 15 672 A1 known. In coaxial with each other arranged editing tools differently profiled cutting are appropriate. The cutting edge with the largest radius is always fixed in 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 outlet. The change of the cutting profile is carried out by a linear movement of one of the movably arranged machining tools, the pneumatic is triggered. The disadvantage of this is that a separate control is necessary for each movable machining tool, which leads to a complex construction with more than two differently profiled cutting.

From the DE 10 2013 010 359 A1 is a milling tool is known in which the differently profiled cutting are not brought by axial, but by radial move in their processing position. For this purpose, the cutting edges are arranged on radially displaceable blade carriers and the pneumatically induced axial movement of the coaxially arranged actuating elements is converted by means of conical bevels into a radial movement of the blade carriers. Even with this milling tool, a separate control must be carried out for each movable machining tool. The processing tools not in working position must be withheld by pneumatic pressure against the centrifugal forces, which requires high adjustment forces at high speeds.

In the from the DE 20 2010 010 704 Known milling tool, the individual processing tools are mounted individually in the tool head and axially displaceable. This allows them to be easily moved from a rest position to a machining position. A machining tool is firmly positioned in the machining position. Unnecessary editing tools are retracted in their rest position. During machining, the activated machining tool must always be held in its machining position by an external force against cutting pressure and spring restoring forces. Since the individual processing tools are arranged outside the axis of rotation, speed-dependent centrifugal forces act on the processing tools, which requires a very precise storage in order to avoid a widening of the diameter of the cutting under load.

The DE 10 2014 008 033 A1 discloses a milling tool in which differently profiled cutting edges are arranged on rotatably adjustable cutting carriers. A profile change takes place by means of a defined synchronous rotational movement of the cutter carriers. Without increasing the complexity of this milling tool, a change of more than three profiles is possible.

The DE 74 26 183 U discloses a milling tool which is composed of two positively associated with each other tool bodies, which are formed approximately symmetrical and carry the cutting. The tool bodies are arranged displaceable relative to one another via a threaded spindle.

The US 4,551,165 A discloses an automatic cutting edge changer for exchanging the cutting edges on a tool. If a sensor detects wear or chipping on the cutting edges, the cutting edge changer moves the cutting tip out of its cutting position and inserts a new cutting edge.

The from the DE 10 2011 004 536 A1 known Mehrprofilfräsvorrichtung is equipped with a first tool, which is located in a working position and a second tool that can be brought into a working position. Between a sliding cylinder for the second tool and the tool, an additional spindle is provided. When the second tool is in the working position, the machining profile of the second tool superimposes the machining profile of the first tool so that a workpiece to be machined receives the second machining profile.

The DE 10 2013 226 214 A1 discloses an apparatus for processing a workpiece made of wood, wood-based materials, plastics or the like, which has two milling tools for contour machining of an edge of the workpiece. The second milling tool is adjustable 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 is engageable with the workpiece. Via a third milling tool, which is arranged coaxially to the other two milling tools, the edge can be milled flush on the workpiece.

Proceeding from this, the present invention seeks to ensure an automatic profile change of at least two, preferably three or more profiles while the tool is stationary without tool change process.

The object is achieved by the independent claims. Advantageous embodiments specify the dependent claims.

To solve the problem, the generic milling tool is characterized in that the at least second machining tool for displacement in the axial direction with a rotatable about the axis of rotation in the housing arranged cam plate can be brought into connection.

With this configuration, the mechanism for changing the profile occupies a small space and the milling tool is simple. In essence, a plurality of second processing tools may be provided. Preferably, the cam plate provided with axially facing cams is incrementally rotatable. This makes it possible to bring the machining tools in their processing position by an axial reciprocating movement.

For this purpose, the first machining tool is preferably rigidly connected to a base body which is non-rotatably coupled to the housing. In particular, preferably, the machining tool is bolted to the base body.

The cam may be connected to a sleeve-shaped pressure ring which has at least one, preferably three, radially inwardly projecting balls (as sliding blocks) which runs in a meandering circumferential groove (as a backdrop) of a rotatably connected to the housing latching sleeve and forms a slotted guide, wherein the inner diameter of the pressure ring is greater than the outer diameter of the detent sleeve.

The ball or the balls are preferably arranged (with play) in a radial bore in the inner wall of the pressure ring and thereby preferably radially adjustable by means of a grub screw to the locking sleeve.

If the meander runs at an acute angle (zig-zag formation), the at least one ball can be guided either clockwise or counterclockwise is, can turn at the direction reversal of the stroke no reversal point. For this purpose, an overlap in the running direction of the ball is preferably provided at the reversal points of the groove.

The cam is preferably rotatably connected to the pressure ring and slidably connected 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 regularly spaced cylinder pins on a pitch 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 disc with the respective machining tool.

The at least one compression spring is preferably axially guided in a spring ring and the spring ring is rotatably supported via a thrust bearing to the pressure ring. Between the fixed machining tool and the one or more sliding machining tools (at least second machining tool) one or three compression springs are arranged in each case.

The pressure ring can be provided on the spindle side with a closed circumferential end face, which serves as a running surface for a rolling element. By this configuration, the operating forces for adjusting the machining position of the machining tools are reduced.

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

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

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

A processing apparatus which 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 executed, and which has at least one pressure element and a rolling element. The pressure element is preferably a sprung bolt and the rolling element is a ball roller.

A method for operating this processing device is characterized in that in the disengagement movement of the actuator in a first step, the contact between the axially movable machining tools and the cam is achieved, in a second step on the meandering groove in the detent sleeve and the at least one ball in the pressure ring, the cam disk is set in rotation, the rotational movement of the cam disk is completed in the subsequent return stroke of the actuator and in a third step at the end of the return stroke the axially movable machining tools again come to rest on the cam.

Figur 1 -

ein Fräswerkzeug in Explosionsdarstellung;

Figur 2 -

eine weitere Explosionsdarstellung des Fräswerkzeuges nach Figur 1;

Figur 3 -

die perspektivische Darstellung des Fräswerkzeuges mit Betätigungseinrichung von der Bearbeitungsseite;

Figur 4 -

die perspektivische Darstellung des Werkzeugs mit Betätigungseinrichtung von der Spindelseite;

Figur 5 -

den Axialschnitt durch das Fräswerkzeug;

Figur 6 -

eine Explosionsdarstellung der Verstellmechanik;

Figur 7 -

Die Verstellmechanik im Halbschnitt

Figur 8 -

eine perspektivische Schnittdarstellung durch das Fräswerkzeug von der Bearbeitungsseite;

Figur 9 -

eine perspektivische Schnittdarstellung durch das Fräswerkzeug von der Spindelseite;

Figur 10 -

eine Schnittdarstellung des Fräswerkzeugs mit dem sich in Bearbeitungsposition befindlichen feststehenden Bearbeitungswerkzeug;

Figur 11 -

die Darstellung des Werkzeugs während der ersten Phase eines Profilwechsels im Axialschnitt;

Figur 12 -

die Darstellung nach Figur 11 während einer zweiten Phase eines Profilwechsels;

Figur 13 -

die Darstellung des Werkzeugs nach Figur 11 während einer dritten Phase;

Figur 14 -

die Darstellung des Werkzeugs nach Figur 11 während einer vierten Phase;

Figur 15 -

die Darstellung des Fräswerkzeugs nach Figur 11 nach Beendigung eines Profilwechsels;

Figur 16 -

die perspektivische Darstellung des Fräswerkzeugs ohne Grundkörper und Gehäuse;

Figur 17 -

die Seitenansicht des Fräswerkzeugs nach Figur 16;

Figur 18 -

die Darstellung des Fräswerkzeugs nach Figur 16 mit dem ersten verschiebbar angeordneten Bearbeitungswerkzeug in Bearbeitungsposition;

Figur 19 -

die Seitenansicht des Fräswerkzeugs nach Figur 18;

Figur 20 -

die Darstellung des Fräswerkzeuges nach Figuren 16 bzw. 18 mit dem zweiten verschiebbar angeordneten Bearbeitungswerkzeug in Bearbeitungsposition;

Figur 21 -

die Seitenansicht des Werkzeugs nach Figur 20;

Figur 22 -

die Prinzipdarstellung eines Profilwechsels.

With the aid of a drawing, an embodiment of the invention will be described below. Show it:

FIG. 1 -

a milling tool in exploded view;

FIG. 2 -

a further exploded view of the milling tool to FIG. 1 ;

FIG. 3 -

the perspective view of the milling tool with Betätigungseinrichung from the processing side;

FIG. 4 -

the perspective view of the tool with actuator from the spindle side;

FIG. 5 -

the axial section through the milling tool;

FIG. 6 -

an exploded view of the adjustment mechanism;

FIG. 7 -

The adjustment mechanism in half section

FIG. 8 -

a perspective sectional view through the milling tool from the machining side;

FIG. 9

a perspective sectional view through the milling tool from the spindle side;

FIG. 10 -

a sectional view of the milling tool with located in the machining position fixed machining tool;

FIG. 11

the representation of the tool during the first phase of a profile change in axial section;

FIG. 12 -

the representation after FIG. 11 during a second phase of a profile change;

FIG. 13

the representation of the tool after FIG. 11 during a third phase;

FIG. 14 -

the representation of the tool after FIG. 11 during a fourth phase;

FIG. 15 -

the representation of the milling tool to FIG. 11 after completion of a profile change;

FIG. 16

the perspective view of the milling tool without body and housing;

FIG. 17

the side view of the milling tool to FIG. 16 ;

FIG. 18

the representation of the milling tool to FIG. 16 with the first displaceably arranged machining tool in the machining position;

FIG. 19

the side view of the milling tool to FIG. 18 ;

FIG. 20 -

the representation of the milling tool after Figures 16 or 18 with the second displaceably arranged machining tool in the machining position;

FIG. 21 -

the side view of the tool FIG. 20 ;

Figure 22 -

the schematic representation of a profile change.

The milling tool according to the invention consists of a base body 4, which carries a fixedly connected by screws 29 first machining tool 1 with a first cutting profile 31 and at least a second axially displaceable machining tool 2 with a second cutting profile 32. The main body 4 is provided with a flange portion 30 with holes for receiving machining tools 1, 2, 3 and with an interface for attachment to a rotatable drive (machine spindle, not shown) executed, for. B. a bore 25, advantageously with a conical bore for backlash centering. On the circumferential side, the milling tool is closed by a housing 11 which is connected via grub screws 40, which engage in corresponding grooves 44 in the base body 4, rotationally fixed and axially displaceable with this (see. FIG. 5 ).

The illustrated embodiment has a fixed to the base body 4 screwed tool 1 with a cutting profile 31 and two axially movable machining tools 2, 3, each with a cutting profile 32, 33, which are guided on different coaxial cylindrical surfaces of the base body 4. About springs 26, 27, the movable machining tools 2, 3 are clamped in the axial direction relative to the fixed tool 1 and cylinder pins 37, 38, they are rotatably and axially slidably connected to the base body 4. The cylindrical pins 37, 38 engage through the bores 37.1, 38.1 in the flange of the base body 4 in order to cooperate with a cam disk 7. By the springs 26, 27, the axially movable machining tools 2, 3 are pressed away from the fixed tool 1. The protruding in the axial direction cam 17 cam plate 7 is rotatably mounted in the base body 4 and fixed axially by a locking 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 processing tools 2, 3 has contact with the cams 17 via the cylinder pins 37, 38, both axially displaceable processing tools 2, 3 engage with their backplanar surface 39 on the base body 4 and the cutting profiles 32, 33 are outside the machining position (in rest position). The solid machining tool 1 is in working position. If the position of the cams 17 is such that one of the two axially displaceable machining tools 2, 3 bears against the cams 17 of the cam disk 7 with its cylinder pins 37, then this machining tool 2, 3 is in its working position with its cutting profile.

Advantageously, the different edge profiles (radii and chamfers) to be produced are distributed over the machining tools 1, 2, 3 so that the fixed machining tool 1 has the largest profile radius and the smaller profile radii and chamfer profiles are assigned to the axially displaceable machining tools 2, 3. If all the cutting 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 machining tool 2, 3 is always overlapped by the profile of an axially displaceable machining tool 1, so that only this axially displaceable machining tool 2, 3 profiling.

The cam plate 7, together with the latching sleeve 5 and the pressure ring 9, the actual adjustment mechanism for the profile change. For this purpose, the locking sleeve 5 is fixedly connected to the housing 4, z. B. on grub screws 34. At its periphery, the locking sleeve 5 has a circumferential substantially zigzag groove 18, which serves as a backdrop for a slotted guide. The groove 18 has a semicircular cross section and serves as a raceway for at least one ball 19. On the circumferential side, the locking sleeve 5 cooperates with a pressure ring 9, which is connected via at least one ball 19, preferably three balls, via the groove 18 with the latching sleeve 5 movable , The movement between locking sleeve 5 and pressure ring 9 is positively guided by the meandering course of the groove 18. The pressure ring 9 is in turn connected via projections 15 which engage in grooves 16 of the cam plate 7, rotationally fixed and axially displaceable with this.

To perform a profile change is pressed at a standstill of the milling tool via a drive side arranged actuator 21 in the axial direction of the housing 11 and the pressure ring 9. The actuator 21 is arranged on the spindle side and via holes 23 with a linear movement unit, for. B. a pneumatic piston (not shown) connected. In the direction of the milling tool, the actuating device 21 has at least one spring-loaded pin 35, which acts on the housing 11, and at least one radially inwardly seated rolling element 36, which acts on the pressure ring 9. The pressure ring 9 has in the contact region of the at least one rolling element 36 via a continuous continuous Tread. In the processing 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. The profile change can be divided into four phases.

In phase 1, the housing 11 is first pushed by the disengagement of the actuator 21 via the spring-loaded bolts against the force of the springs 26, 27 in the direction of the machining side A. In this case, the housing 11 takes over its end face, the two axially movable machining tools 2, 3 with, until they strike the stationary machining tool 1, so that the cylinder pins 37, 38 outside of the contact area with the cam 7 get and no longer contact between the backplane 39 and consists of the base body 4. The total spring force of the sprung bolts 35 must be greater than the total spring force of the springs 26, 27. In this state, the cam disc 7 is relieved, whereby the friction decreases in their subsequent rotational movement. During this phase, the sprung 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 machining side A. The sprung bolts 35 yield in the process. Since the housing 11 is locked against rotation via the contact with the spring-loaded bolts 35 and the housing 11 is in turn rotationally coupled via positive engagement with the base body 4 and the latching sleeve 5, an axial movement of the pressure ring 9 via the slide guide causes a rotational movement of the pressure ring 9 enforced until the at least one ball 19 reaches the processing-side reversal point of the slotted guide. About the interlocking elements 15, 16, the rotational movement of the pressure ring 9 is transmitted to the cam plate 7. The cams 17 assume a different position relative to the machining tools 2, 3.

With the return stroke of the actuator 21 Phase 3 begins. The rotational movement of pressure ring 9 and cam 7 is now by the spring force causes the springs 28 and continues until the at least one ball 19 reaches the spindle-side reversal point of the backdrop. In this position, the pressure ring 9 and with it the cam disc 7 is locked.

In phase 4, the axially displaceable machining tools 2, 3 are moved by means of the springs 26, 27 in the direction of the spindle side B until, depending on the position of the cam disc 7 either with its cylinder pins 37, 38 on the cam 17 of the cam disc 7 or with its back plane surface 39 abut the base body 4.

After completion of the profile change, the actuator 21 has no contact with the tool more (gap).

The substantially zigzagging groove 16 of the locking sleeve 5 is designed so that the cam 7 in incremental steps always in the same direction - ie either clockwise or counterclockwise - rotates, so after completion of an operating cycle consisting of disengagement and return movement (Back and forth), the cam 17 of the cam 7 in an altered rotational position to the machining tools 2, 3 are. For this purpose, the substantially zigzag groove 16 of the locking sleeve 5 (slide guide) at the reversal points on an overlap in the direction of the ball 19, so that when reversing direction of the stroke no dead center can be set and the at least one ball 19 passes through the slotted guide in one direction.

In a preferred embodiment, the oblique areas of the substantially zigzag groove 16 have different pitches. In such an embodiment, an overlap of the zigzag groove 16 is required only at the reversal points from the large to the small pitch. Advantageously, an embodiment in which the groove areas in the direction of the disengagement movement triggered by the actuating device 21 have a greater pitch 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 in the disengagement and return stroke and the wear of the backdrop can be reduced. Particularly advantageous is an embodiment in which the slope of the steeper running groove areas decreases in the direction of movement of the ball 19 degressive. Such a Nutverlauf the force pulse can be reduced in a sudden onset disengagement and the wear on the slide guide can be minimized.

The division of slotted guide and cams or cylindrical pins 37, 38 is suitably coordinated so that after each actuation cycle another tool is brought into working position. Due to the bias of the springs 28 and the zigzag course of the groove 16, the device engages after each switching cycle (profile change) in the new position.

Since each angular position clearly a cutting profile 31, 32, 33 can be assigned, the angular position of the pressure ring 9 relative to the housing 11 for indexing the respective active cutting profile 31, 32, 33rd be used on the spindle side B of the milling tool by z. B. on the housing 11 an indexing mark 43 is attached to the pressure ring 9 and different markings 42 for the various cutting profiles 31, 32, 33, so that always the indexing mark opposite profile marking the active cutting profile 31, 32, 33 indicates (Principle "parking disc"). This possibility of detecting the active cutting profile 31, 32, 33 is particularly required for referencing the machine control during initial startup or after faults. The markings 42 mounted on the spindle side are clearly visible from the operator side, while the cutting profiles 31, 32, 33 are generally not accessible, since 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 reset

1. 1st time switching by axial pressing of the actuator 21 machining tool 2 in working position → advanced machining tool 2 3 reset
2. 2nd time switching by pressing the actuator 21 axially Machining tool 3 in working position → machining tool 3 advanced 2 reset
3. 3. Switch times by pressing the actuator 21 axially machining tool 1 back into working position.

LIST OF REFERENCE NUMBERS

1

First processing tool (fixed)

2

Second processing tool (axially displaceable)

3

Third processing tool (axially displaceable)

4

body

5

locking sleeve

6

spring washer

7

cam

8th

thrust

9

pressure ring

10

circlip

11

casing

12

screw

13

ring

14

circlip

15

head Start

16

groove

17

cam

18

Groove (backdrop)

19

Bullet

20

grub screw

21

actuator

22

supporting body

23

mounting hole

24

Threaded hole (for grub screw)

25

Bore (interface to the machine spindle)

26

feather

27

feather

28

feather

29

screw

30

flange

31

first cutting profile

32

second cutting profile

33

third cutting profile

34

grub screw

35

Sprung bolt (pressure element)

36

Rolling element ("ball roller")

37

straight pin

37.1

drilling

38

straight pin

38.1

drilling

39

End contact surface

40

grub screw

41

tread

42

Marking for marking the cutting profile

43

Mark for indexing the cutting profile

44

groove

A

edit page

B

spindle side

D

axis of rotation

Claims (15)

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, in a rotatable about a rotation axis (D) rotatable housing (11), stationary machining tool (1) and at least one second machining tool (2, 3) which is arranged coaxially to the first machining tool (1) displaceable between a rest position and a machining position, characterized in that the at least second machining tool (2, 3) for displacement in the axial direction with a in the housing (11 ) about the rotational axis (D) rotatably arranged cam disc (7) can be brought into connection. Milling tool according to claim 1, characterized in that at least two between a rest position and a processing position slidably arranged machining tools (2, 3) are provided. Milling tool according to claim 1 or 2, characterized in that the cam disc (7) is incrementally rotatable. Milling cutter according to one of the preceding claims, characterized in that the machining tool (1) rigidly connected to a base body (4), preferably screwed, which is non-rotatably coupled to the housing (11). Milling tool according to claim 3 or 4, characterized in that the cam disc (7) is connected to a sleeve-shaped pressure ring (9) having at least one, preferably three, radially inwardly projecting balls (19), as a sliding block, which in a meandering circumferential groove (18) of a rotatably connected to the housing (11) locking sleeve (5), as a backdrop, runs, wherein the inner diameter of the pressure ring (9) is greater than the outer diameter of the latching sleeve (5). Milling tool according to claim 5, characterized in that the ball (19) with play in a radial bore (24) in the inner wall of the pressure ring (9) is arranged. Milling tool according to claim 5 or 6, characterized in that the meander extends at an acute angle, wherein the at least one ball (19) can be guided either only in a clockwise direction or only in a counterclockwise direction. Milling tool according to one of claims 5 to 7, characterized in that the cam disc (7) with the pressure ring (9) rotatably and slidably connected in the axial direction. Milling tool according to one of claims 5 to 8, characterized in that between the pressure ring (9) and the base body (4) at least one axially acting compression spring (28) is provided. Milling tool according to one of the preceding claims, characterized in that each displaceably arranged machining tool (2, 3) on a pitch circle regularly spaced cylindrical pins (37, 38) which are parallel to the axis of rotation (D) and with on the cam disc (7) arranged cam (17) can be brought into operative connection. Milling tool according to claim 9, characterized in that the at least one compression spring (28) in a spring ring (6) is axially guided and the spring ring (6) via a thrust bearing (8) is rotatably mounted to the pressure ring (9). 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 processing tools (1, 2, 3) has differently profiled cutting edges (31,, 32, 33). 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 is executable, and which has at least one pressure element (35) and a rolling element (36). Machining device according to claim 13, characterized in that the pressure element (35) is a sprung bolt and the rolling element (36) is a ball roller. Method for operating a machining device according to claim 13 or 14, characterized in that in the disengagement movement of the actuating device (21) in a first step, the contact between the axially movable machining tools (2, 3) and the cam disc (7) is dissolved in one second step on the meandering groove (18) in the latching sleeve (5) and the at least one ball (19) in the pressure ring (9) the cam disc (7) is rotated, the rotational movement of the cam disc (7) in the subsequent Return stroke of the actuating device (21) is completed and in a third step at the end of the return stroke, the axially movable machining tools (2, 3) again come to rest against the cam disc (7).

Images