DEBURRING TOOL FOR FORWARD AND BACKWARD DEBURRING OF HOLE EDGES

Description

[0001] The following new design of a tool holder for deburring or chamfering bore edges with a paired arrangement of cutting blades is a further development of deburring tools as described in DE 2649208 A1 [reference number 1] and DE 102008046087 A1 [reference number 2]. The description of the deburring tool contained in these two publications is part of the present description of the invention.

[0002] DE 26 49 208 C [1] discloses a tool holder for deburring the edges of through-holes on both sides, comprising a tool head that can be driven in rotation via a shaft and has two cutting blades that point essentially radially outward, are guided in receiving slots, and are pushed outward by spring force. The spring force is transmitted to the cutting bodies by means of a rocker that is arranged so that it can rotate about the longitudinal axis of the tool holder. The spring is designed as a torsion spring, which is fastened on the one hand to the tool housing and on the other hand engages the rocker that can rotate in a bore and engages with pin-shaped projections in slot-shaped recesses in the cutting blades.

[0003] This document further shows that the rotational movement of the rocker is limited by an externally operable adjusting screw, the tip of which rests against a contact surface of the rocker. The pin-shaped projections of the rocker are disengaged from the cutting blades by a screw with an eccentric shoulder engaging a recess in the rocker.

[0004] DE 10 2008 046 087 A1 [2] shows a similar deburring tool for deburring bores with a paired arrangement of cutting knives and a rotatingly driven tool holder, wherein in a rectangular receiving slot (knife recess) the cutting knives are opposite one another with radially outward-facing, conical cutting edges and are driven radially displaceably against one another by a rotatable rocker arranged inside the tool holder in a base body by means of rocker bolts arranged on the front side of the rotating rocker, and the rocker is mounted in the tool holder so as to be rotatable about an axial longitudinal axis and is spring-loaded in the axial direction, with a rocker bolt of the rocker engaging in a respective groove of the cutting knife. The rocker is arranged in the knife housing of the deburring tool so that it can be raised and lowered against the force of a torsion spring, and the spring preload of the torsion spring can be controlled and adjusted in the torsion direction.

[0005] The following additional publications are also known: EP 0291563 B1 describes the design of cutting blades as used in the present invention. DE 2 407 269 A1 describes a different type of guiding and resetting of cutting elements in a generic deburring tool.

[0006] The invention is based on a deburring tool having the features of the preamble of claim 1.

[0007] Due to the special shape of the cutting blades, deburring of hole edges occurs both when the deburring tool moves forward into a hole and when the deburring tool moves backward out of the hole, during which the opposite edge of the same hole is deburred.

[0008] However, the technical teaching of the patent claims is not limited to the deburring of the edges of a through-hole on both sides. It is also possible to deburr only a single edge of the hole on one side, without deburring the edge on the rear side of the through-hole. Likewise, it is possible to deburr only the edge of a blind hole.

[0009] The invention is based on the two above-mentioned documents [1] and [2].

[0010] According to DE 10 2008 046 087 A1 [reference number = 2], the rocker (22 [2]) is retracted for blade changes using an eccentric piece (25 [2]). This has the following disadvantages: a) If the eccentric piece is not properly reset after the blades have been installed, the rocker will not engage the cutting blades, and these may be lost during the machining process. b) The rocker is moved axially backwards against the torsion spring (12 [2]). Due to frictional forces, primarily generated by contamination during the machining process, the spring, which is primarily designed for torsion, can no longer reliably reset the rocker, and the cutting blades will no longer engage. In this case, the cutting blades may also be lost during the machining process. c) Releasing the rocker using the eccentric piece (25 [2]) and the associated components on the rocker is complex and costly.

[0011] The invention, based on DE 10 2008 046 087 A1, is therefore based on the general task of developing a deburring tool so that its use is simpler and more reliable. The operation of the tool and the setting of the deburring parameters should be simpler, more reliable, and more precise.

[0012] According to one aspect of the invention, there is a problem in the prior art in adjusting the chamfer size of the deburred bore edge by controlled rotational adjustment of the rocker.

[0013] DE 2649208 A1 [1] shows a rocker, referred to there as an intermediate body (14 [1]), whose radial position can be adjusted by an adjusting screw (17 [1]) and which defines the radial position of the cutting blades (24 [1]) and thus the chamfer size of the bore edge. This causes the following disadvantages: a) The adjustment screw can become displaced due to vibrations during the machining process, altering or impairing the chamfering result. b) The radial position of the rocker cannot be adjusted reproducibly because there is no marking indicating the position of the rocker. c) Adjusting the radial rocker position using this adjustment screw and the corresponding components on the rocker is complex and costly.

[0014] According to this aspect, the invention has the task of reproducibly adjusting and re-adjusting the radial position of the knife housing to the rocker by turning it by designing a new adjustment mechanism in order to adjust the chamfer size and maintain process reliability.

[0015] DE 10 2008 046 087 A1 [2] showed that the knife housing (2 [2]) is always anchored radially in the same position with the base body (1 [2]) and the chamfer size is adjusted by turning the rocker relative to the base body.

[0016] A deburring tool according to the invention comprises the features of claim 1. Preferred embodiments are defined in the dependent claims 2-17.

[0017] The invention is explained in more detail below with reference to drawings illustrating only one embodiment. Further features and advantages of the invention will become apparent from the drawings and their description. Fig. 1 : Sectional view of the tool holder with an overall overview Fig. 2 : Sectional view through the tool holder showing the principle of knife change (rocker engaged) Fig. 3: Sectional view through the tool holder showing the principle of knife change (knife free for change) Fig. 4 : Sectional view of the tool holder showing the principle of adjusting the chamfer and deburring size (loosening and tightening the adjusting piece) Fig.5 : Side view of the tool holder showing the principle of adjusting the chamfer and deburring size (example position 1) Fig.6 : Side view of the tool holder showing the principle of adjusting the chamfer and deburring size (example position 2) Fig.7 : Sectional view through the tool holder showing the principle of the spring preload of the rocker Fig. 8 : Perspective view of a cutting knife Fig. 9 : Sectional view of the tool holder showing the principle of knife changing (inserting the knives) Fig. 10 : Exploded view of the essential parts of the deburring tool Figure 11: Detachable connection between the adjusting piece, the clamping piece and the base body Figure 12 : Perspective view of the clamping piece Figure 13 : View of the adjusting piece from the connection side Figure 14 : View of the adjusting piece from the inside Figure 15 : Perspective view of the assembly of clamping piece and adjusting piece Figure 16 : View into the interior of the adjusting piece with coupled clamping piece Basic function of the tool holder 1

[0018] The tool holder 1, which is driven in rotational direction 36, is used to apply chamfers or deburring to the front and / or rear edges of bores. The tool axis 37 is aligned with the center axis of the bore to be deburred.

[0019] The tool holder 1 operates with two diametrically opposed cutting blades 2, 2a. Such a cutting blade 2, 2a and its drive are described, for example, in EP 0 291 563 B1. Reference is made to the disclosure therein. Since the cutting blades 2, 2a are identically constructed, it is sufficient to describe only one cutting blade 2 for the following description.

[0020] The cutting blades 2, 2a are Figures 2 and 3 held in its extended position by a spring-loaded cylindrical rocker 4 rotating in the tool axis 37 by means of axially directed rocker pins 15, 15a, which engage in pin grooves 25 in the upper sides of the cutting blades 2, 2a. This position also defines the radial position of the cutting edges 27, 28 of the cutting blades 2, 2a according to Figure 8 and thus the size of the deburring or chamfer.

[0021] The rocker 4 is according to Figure 4by its stop pin 10 pointing in the radial direction, which rests against a stop pin 11 of the base body 6, is held in a spring-loaded basic position relative to the base body 6.

[0022] In the opposite direction, the rocker 4 can rotate freely against the spring preload of a torsion spring 9. The torsion spring is supported according to Figure 1 with its upper end on an axial shoulder of the shaft 7, while the lower end is connected to an axial shoulder of the rocker 4.

[0023] During the machining process, when the chamfer or deburring size is reached, the cutting knives 2 can retract as a result of the process forces and slide through the bore to be deburred in order to exit the bore on the opposite side and come into their extended position under spring load.

[0024] The rocker 4 is rotated against the spring force of the torsion spring 9 and further preloaded. This preload then drives the cutting blades 2 radially outward again for the next process step of further deburring. With an axial backward movement of the rotating tool holder 1, the rear edge of the bore can also be deburred or chamfered.

[0025] This describes a preferred embodiment in which the chamfering or deburring size can be adjusted. The cylindrical pin-shaped rocker 4 is rotatably mounted in a knife housing 3, at the lower end of which a window-like knife recess 20 is arranged for the storage of the cutting knives 2, 2a arranged there.

[0026] In the knife housing 3, according to the Figures 1 - 3Diametrically opposite threaded holes are arranged, into each of which a locking screw 12, 12a is screwed. In the clamping position, each locking screw 12, 12a rests with its bolt-side end on the outer circumference of the rocker 4.

[0027] By loosening the locking screws 12, 12a for securing the blade housing 3, the blade housing 3 can be pulled forward relative to the rocker 4 in the axial direction of the arrow 18. This is in comparison between the Figures 2 and 3The rocker 4 thus forms the bearing body for the displacement of the blade housing 3, which is slidably mounted on the rocker 4. Thus, the cutting blades 2, 2a, which are mounted in the blade recess 20 in the base body 6, also move forward with the axial displacement of the blade housing 3. In doing so, the two rocker pins 15, 15a lose their engagement in the pin grooves 25 of the cutting blades 2, 2a, and the blades are released and can be removed from the blade recess 20.

[0028] This process is compared between Figure 2 and Figure 3 The blade housing 3 is held in a central bearing recess 50 in an adjusting piece 5 by means of an inner, central axial shoulder, which can be displaced and fixed in the direction of rotation. The axial feed movement of the blade housing 3 in the central bearing recess 50 in the direction of arrow 18 on the rocker 4 held in the tool holder 1 creates Figure 3a free space 39 between the inner end face of the knife housing 3 and the opposite end face of the base body 6 and due to this axial distance the rocker bolts 15, 15a come out of engagement with the knife-side bolt grooves 25. The cutting knives 2, 2a can then be removed from the knife recess 20 and replaced with new cutting knives.

[0029] In order to prevent the knife housing 2 from being pulled out completely from the bearing holder 50 during this action and to prevent the orientation from being lost for re-locking by means of the locking screws 12, 12a, a limiting screw 16 is provided in the adjusting piece 5, which engages in a limiting groove 17 in the knife housing 3 and limits the movement of the knife housing 2 both radially and axially.

[0030] The adjusting piece 5 is according to the Figures 10-16a cylindrical sleeve, which has the lower bearing receptacle 50, which is open on one side in the axial direction, into which a central axial shoulder of reduced diameter of the knife housing 3 engages and is accommodated there in a displaceable and fixable manner. The adjusting piece 5 is according to Figures 2 and 3 connected to the lower end face of a clamping piece 8 via bearing bolts.

[0031] Before inserting new cutting blades 2, 2a, the blade housing 3 is first pushed back in the direction of arrow 19 and then positively secured with the adjusting piece 5 by means of the locking screws 12, 12a. The new cutting blades 2, 2a can then be inserted independently of one another, one after the other, in the direction of the arrow 30 into the blade recess 20 in the blade housing 6. The insertion bevels 26 provided for this purpose on the cutting blades 2, 2a press the rocker 4 in the axial direction of the arrow 31 (see Fig. 9) backwards and the rocker bolts 15, 15a of the now also axially spring-loaded rocker 4 snap back into the bolt grooves 25 (see Fig. 8 ) and fix the cutting blades 2, 2a also in the radial direction.

[0032] In the basic position of the tool holder 1, before the planned chamfer or deburring is applied, the rocker 4 is in a spring-preloaded fixed position relative to the base body 6. The components stop pin 10 of the rocker 4 and stop pin 11 in the base body 6 hold the rotating spring-preloaded rocker 4 in one direction in this fixed position by the torsional force of the torsion spring 9 pressing the rocker-side stop pin 10 against the base body-side stop pin 11.

[0033] In order to set or adjust the chamfer or deburring size, it is necessary to rotate the blade housing 3 in the circumferential direction relative to the rocker 4 and thus to the base body 6. The necessary components to carry out this adjustment process continuously and with sufficient precision are the adjusting piece 5, the clamping piece 8, and the locking screws 13, 13a. They connect the blade housing 3 to the base body 6 both detachably and in the locked state with sufficient precision to ensure the concentricity of the blade housing 3 and provide sufficient frictional connection to transfer the cutting forces to the shaft 7.

[0034] During tool assembly, a connection is established between the adjusting piece 5 and the clamping piece 8, which is maintained throughout the entire service life of the tool. This is advantageously achieved using the measures described below.

[0035] The recess 48 on the top side of the adjusting piece 5 is designed such that, during tool assembly, the cam 47 on the clamping piece 8 can be inserted into the adjusting piece 5 through the recess 48 in a specific rotational position and, upon subsequent rotation, engages the inside of the adjusting piece 5. The recess 48 roughly corresponds to the shape of the cam 47 and serves solely to insert the cam 47 into the adjusting piece 5. The recess 48 no longer serves any function during operation.

[0036] The elongated shape of the cam 47 and the corresponding recess 48 in the adjusting piece 5 are intended during assembly to ensure that the cam 47, with an approximate 90° rotation, encounters a counter surface inside the adjusting piece 5, namely the contact surface 43, and can pull the adjusting piece 5 toward the base body 6. This therefore involves a rotary plug-in connection between the clamping piece 8 connected to the cam 47 and the adjusting piece 5, which is detachably connected to it for assembly purposes and is thereby connected to the base body 6.

[0037] In another preferred embodiment, such a detachable connection can also be designed in the form of a kinematic reversal of the above-described rotary plug-in connection. In this case, the cam 47 is integrally formed on the adjusting piece 5 in an axial extension and engages in a conforming recess 48 in the clamping piece 8 in the manner of the previously described rotary plug-in coupling.

[0038] In addition to this kinematic reversal of a detachable plug-in rotary coupling connection, there are other preferred embodiments for connecting the three aforementioned parts 5, 6, 8. For example, a magnetic coupling can be provided for detachably coupling these parts. Likewise, several cams distributed around the circumference can be arranged on the end face of one part, engaging in similar recesses distributed around the circumference on the opposite part.

[0039] Neither the adjusting piece 5 nor the clamping piece 8 with its cam 47 have a fixed connection to the rocker 4. The rocker 4 freely extends through these components 5, 8 and can be freely moved both axially and radially relative to these components 5, 8.

[0040] Accordingly, according to the Figure 11 The adjusting piece 5 is detachably connected to the base body 6 via the clamping piece 8. On the clamping piece 8, Figure 12in axial extension the oval or rectangular shaped cam 47 is formed. The Figure 13 shows the view of the adjusting piece 5 from the connection side to the base body 5. The Figure 14 shows the view into the interior of the adjusting piece 5 with the contact surface 43.

[0041] You Figure 15 shows the view of the adjusting piece 5 and the clamping piece 8 in the orientation how the cam 47 of the clamping piece 8 can be inserted into the adjusting piece 5 during assembly of the tool. Furthermore, the Figure 16 the view into the interior of the adjusting piece 5 with the now transverse cam 47 of the clamping piece 8, which has the task of pulling the adjusting piece 5 releasably and, in the released state, also rotatably towards the base body 6.

[0042] It is provided that the adjusting piece 5 is rotatably mounted on the base body 6 by means of this cam 47 in the released state for setting or adjusting the chamfer size and that in the locked state the cam 47 pulls the adjusting piece 5 axially towards the base body 6 so that the adjusting piece 5 is also fixed radially (in the direction of rotation) to the base body 6 with the friction forces generated at this connection.

[0043] The clamping piece 8 enables the continuous adjustment of the chamfer size and, when the adjusting piece 5 is locked, guarantees that the setting remains unchanged. For this purpose, the cylindrical pin-like rocker 4 engages according to Figure 10 through the central bore 49 of the clamping piece 8.

[0044] The cylindrical adjusting piece 5 receives the clamping piece 8 with its central recess 48.

[0045] By loosening the locking screws 13,13a, the force connection between the base body 6 and the adjusting piece 5 is removed and the cutting blades 2, 2a can be adjusted according to Figure 7 By rotating the blade housing 3, for example in direction 21 relative to the rocker 4, the eccentric gear formed by the rocker pins 15, 15a and the pin grooves 25 on the blade side, can be radially displaced and adjusted. Figures 5 and 6 The markings 22 shown on the base body 6 and the adjusting piece 5 help to adjust the rotational position of the blade housing 3 in a scaled and reproducible manner. The maximum adjustment range is limited by the engagement of the limiting pin 23 in the adjusting piece 5 in the limiting groove 24 in the base body 6, so that the cutting blades 2, 2a cannot be moved beyond the geometrically defined range in the radial direction.

[0046] When tightening the locking screws 13, 13a on the base body side, which engage with their bolt ends in radially outwardly directed conical surfaces 45 in the clamping piece 8, the force connection between the adjusting piece 5 and the base body 6 is restored by means of the clamping piece 8 and the two components 5, 6 are fixed to one another without the set adjustment being shifted.

[0047] The use of a shank 7 for adapting the tool holder 1 in the machine tool is provided. The shank 7 is connected to a motor-driven, rotary chuck in the machine tool (not shown in the drawings).

[0048] The adjustment of the radially acting spring preload of the rocker 4, namely the preload torque on the cutting blades 2, 2a, required for machining various materials, is advantageously integrated into the connection between the base body 6 and the shaft 7. The cutting force is transmitted via the torsional load-transmitting connection between the base body 6 and the shaft 7 by means of the locking screws 14, 14a in the base body 6. The locking screws 14, 14a in the base body 6 engage in an annular groove 38 in the shaft 7. According to Figure 7 the torsion spring 9 is connected with its upper end to an axial projection on the underside of the shaft 7, while the other end is connected to an axial projection of the rocker 4.

[0049] By loosening the two locking screws 14, 14a, the shaft 7 can be rotated relative to the base body 6, for example, in the direction of arrow 35, in which case the torsion spring 9 is tensioned and released in the opposite direction. By subsequently tightening the locking screws 14, 14a, the force-transmitting connection between the shaft 7 and the base body 6 is restored. The diametrically opposed locking screws 14, 14a also enable the necessary accuracy of the connection to ensure the concentricity of the tool holder 1 as a whole. The markings 34 on the base body 6 and the shaft 7 enable a scalable and reproducible adjustment of the preload force of the torsion spring 9. The maximum desired adjustment range is limited in the circumferential direction by the elements limiting pin 32 in the shaft 7 and limiting groove 33 in the base body 6.

[0050] From the explosive representation of the Figure 10further details of the deburring tool according to the invention emerge.

[0051] When locked, the blade housing 3, adjusting piece 5, and base body 6 are firmly connected to one another via the locking screws 12, 12a in the blade housing 3. The connection of the adjusting piece 5 to the base body 6 is established by means of the clamping piece 8, which can be adjusted and locked in the axial direction of the arrow 46. The clamping piece 8 is releasably connected to the base body 6 via the locking screws 13, 13a. The bolt-side conical surfaces 44 of the locking screws 13, 13a engage the approximately similar bore-side conical surfaces 45 in the clamping piece 8.

[0052] The clamping piece 8 engages with its cam 47 arranged on the underside into the interior of the adjusting piece 5 in a shaped recess 48 arranged therein such that the cam contact surface 42 on the clamping piece side rests against the inner contact surface 43 of the adjusting piece 5.

[0053] By tightening the two locking screws 13, 13a on the base body side into the radially outward-facing conical surfaces 45 in the form of bores in the clamping piece 8, the clamping piece 8 is moved axially into the base body 6 in the direction of arrow 46 and pulls the adjusting piece 5 axially against the base body 6. The upper, frontal contact surface 40 of the adjusting piece 5 rests against the opposite contact surface 41 of the base body 6 and builds up the necessary radially acting frictional connection. The adjusting piece 5 is thus axially fixed to the base body 6 by form fit and radially by frictional connection. The rocker 4 remains mounted so that it can rotate and be axially displaced relative to the knife housing 3, adjusting piece 5 and clamping piece 8.By slightly loosening the locking screws 13, 13a, the radially acting frictional connection between the base body 6 and the adjusting piece 5 is released, and the adjusting piece 5, together with the knife housing 3 attached to it, can be rotated relative to the base body 6. This allows the chamfer or deburring size to be set or adjusted. This connection between the adjusting piece 5 and the base body 6 is therefore established by means of the clamping piece 8, so that when these two parts are secured, no disruptive forces occur during rotation, which could impair precise adjustment during securing. The clamping piece 8 serves merely as a connecting piece to ensure exclusively axially directed movement.

[0054] The axial movement in the direction of arrow 46 for fixing the parts adjusting piece 5 by means of clamping piece 8 and base body 6 is triggered by the engagement of the outer conical surfaces 44 of the locking screws 13, 13a in the inner conical surfaces 45 of the clamping piece 8. List of reference symbols

[0055] 1 Tool holder 2 Cutting blade 2a Cutting blade 3 Blade housing 4 Rocker 5 Adjusting piece 6 Base body 7 Shaft 8 Clamping piece 9 Torsion spring 10 Stop pin (rocker) 11 Stop pin (base body) 12 Locking screw (blade housing) 12a Locking screw (blade housing) 13 Locking screw (adjusting piece) 13a Locking screw (adjusting piece) 14 Locking screw (shaft) 14a Locking screw (shaft) 15 Rocker bolt 15a Rocker bolt 16 Limit screw 17 Limit groove (blade housing) 18 Bearing direction 19 Arrow direction 20 Blade recess 21 Arrow direction (adjusting piece) 22 Marking (chamfer size) 23 Limit pin (adjusting piece) 24 Limit groove (base body) 25Bolt groove (knife) 26Introduction chamfer 27Cutting edge (forward) 28Cutting edge (backward) 29Chip recess 30Arrow direction (knife) 31Arrow direction (rocker) 32Limiting pin (shank) 33Limiting groove (base body) 34Marking (spring preload) 35Arrow direction (shank) 36Rotation direction 37Tool axis 38Ring groove (shank) 39Free space40Rear contact surface (adjusting piece) 41Contact surface (base body) 42Cam contact surface (clamping piece) 43Inner contact surface (adjusting piece) 44Outer tapered surfaces (of 13, 13a) 45Inner tapered surfaces (clamping piece) 46Arrow direction 47Cam (clamping piece) 48Recess 49Central bore (in 8) 50Bearing mount (in 5 for 3) List of reference symbols

[0056] 1 Tool holder 2 Cutting blade 2a Cutting blade 3 Blade housing 4 Rocker 5 Adjusting piece 6 Base body 7 Shaft 8 Clamping piece 9 Torsion spring 10 Stop pin (rocker) 11 Stop pin (base body) 12 Locking screw (blade housing) 12a Locking screw (blade housing) 13 Locking screw (adjusting piece) 13a Locking screw (adjusting piece) 14 Locking screw (shaft) 14a Locking screw (shaft) 15 Rocker bolt 15a Rocker bolt 16 Limit screw 17 Limit groove (blade housing) 18 Bearing direction 19 Arrow direction 20 Blade recess 21 Arrow direction (adjusting piece) 22 Marking (chamfer size) 23 Limit pin (adjusting piece) 24 Limit groove (base body) 25Bolt groove (knife) 26Introduction chamfer 27Cutting edge (forward) 28Cutting edge (backward) 29Chip recess 30Arrow direction (knife) 31Arrow direction (rocker) 32Limiting pin (shank) 33Limiting groove (base body) 34Marking (spring preload) 35Arrow direction (shank) 36Rotation direction 37Tool axis 38Ring groove (shank) 39Free space40Rear contact surface (adjusting piece) 41Contact surface (base body) 42Cam contact surface (clamping piece) 43Inner contact surface (adjusting piece) 44Outer tapered surfaces (of 13, 13a) 45Inner tapered surfaces (clamping piece) 46Arrow direction 47Cam (clamping piece) 48Recess 49Central bore (in 8) 50Bearing mount (in 5 for 3)

Claims

1. A deburring tool for deburring bores, comprising a pairwise arrangement of cutting blades (2, 2a) and a rotatably driven tool holder (1), wherein in a blade recess (20) of a blade housing (3), the cutting blades (2, 2a), which are arranged opposite each other and have radially outwardly facing conical cutting edges (27, 28), are driven so as to be radially displaceable relative to each other by a rotatable rocker (4) arranged in a base body (6) of the tool holder (1), and the rocker (4) is supported in the tool holder (1) so as to be rotatable about an axial longitudinal axis and is spring-biased in the axial direction, characterised in that, in order to adjust the chamfer size of a bore edge, the radial turning position of the knife housing (3) relative to the rocker (4) and to the base body (6) can be continuously turned and fixed.

2. The deburring tool according to claim 1, characterised in that a stop pin (10) of the rocker (4) and a stop pin (11) in the base body (6) hold the rotatably spring-loaded rocker (4) in a fixed stop position in the knife housing (3) in one direction of rotation.

3. The deburring tool according to claim 2, characterised in that the torsional force of the torsion spring (9) preloads the stop pin (10) on the rocker side against the stop pin (11) on the base body side in the one-sided stop position of the rocker (4).

4. The deburring tool according to any one of claims 1 to 3, characterised in that the cylindrical adjusting piece (5) connected to the base body (6) is detachably coupled at the front end to a cylindrical clamping piece (8).

5. The deburring tool according to any one of claims 1 to 4, characterised in that radially inwardly directed locking screws (13, 13a) are arranged in the base body (6), which connect the adjusting piece (5) to the base body (6) by means of the clamping piece (8) in a manner that is both detachable and adjustable in a fixed position, in order to transfer the cutting forces to the shaft (7).

6. The deburring tool according to any one of claims 1 to 5, characterised in that the stepless adjustment of the chamfer size of the bore edge is effected by turning the adjusting piece (5) relative to the base body (3), and that when the adjusting piece (5) is fixed by means of the internal clamping piece (8), the established chamfer size setting is fixed.

7. The deburring tool according to any one of claims 1 to 6, characterised in that the force fit between the base body (6) and the adjusting piece (5) is released by loosening the locking screws (13, 13a) on the base body side, and that the cutting blades (2, 2a) can be radially displaced and adjusted by turning the blade housing (3) relative to the rocker (4) via the eccentric gear formed by the rocker pins (15, 15a) and the blade-side pin grooves (25).

8. The deburring tool according to any one of claims 1 to 7, characterised in that, for adjusting the rotational position of the knife housing (3) in a scaled and reproducible manner, markings (22) are provided on the base body (6) in juxtaposition to markings on the adjusting piece (5).

9. The deburring tool according to claim 8, characterised in that, in order to limit the maximum adjustment range of the cutting blades (2, 2a), a limiting pin (23) in the adjusting piece (5) engages in a limiting groove (24) in the base body (6).

10. The deburring tool according to any one of claims 1 to 9, characterised in that, when the locking screws (13, 13a) on the base body side are tightened against the clamping piece (8), the force fit between the adjusting piece (5) and the base body (6) can be restored.

11. The deburring tool according to at least one of claims 1 to 10, characterised in that, in the fixed state, the knife housing (3), the adjusting piece (5) and the base body (6) are fixedly connected to one another, and that the connection of the adjusting piece (5) to the base body (6) is established by means of the clamping piece (8) in the axial direction of the arrow (46).

12. Deburring tool according to at least one of claims 1 to 11, characterised in that the clamping piece (8) is detachably connected to the base body (6) by means of the locking screws (13, 13a).

13. Deburring tool according to claim 12, characterised in that the clamping piece (8) is detachably coupled to the adjusting piece (5).

14. The deburring tool according to claim 12 or 13, characterised in that the detachable coupling between the clamping piece (8) and the adjusting piece (5) is designed as a plug-in rotary coupling.

15. The deburring tool according to any one of claims 11 to 14, characterised in that the chamfer or deburring size can be adjusted or set on account of during fixing of the two conical locking screws (13, 13a) arranged in the base body (6) into associated, radially directed conical surfaces (45) arranged in the clamping piece (8), the clamping piece (8) can be moved in the axial direction of the arrow (46) thereby pulling the adjusting piece (5) towards the base body (6).

16. The deburring tool according to at least one of claims 1 to 15, characterised in that the adjusting piece (5) is connected to the base body (6) axially by form fit and radially by force fit, and that the rocker (4) remains rotatably and axially displaceably mounted relative to the knife housing (3), the adjusting piece (5) and the clamping piece (8).

17. The deburring tool according to at least one of claims 1 to 16, characterised in that the positive connection between the adjusting piece (5) and the base body (6) is established by means of the clamping piece (8) so that when these two parts (5, 6) are fixed, no forces acting in the direction of rotation occur which interfere with the precise adjustment during the fixing.