WO2015063236A1

WO2015063236A1 - Tool for machining workpiece surfaces

Info

Publication number: WO2015063236A1
Application number: PCT/EP2014/073397
Authority: WO
Inventors: Dieter Kress
Original assignee: MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG
Priority date: 2013-10-31
Filing date: 2014-10-30
Publication date: 2015-05-07
Also published as: DE102013222206A1

Abstract

A tool for machining workpiece surfaces is proposed, having a main body (3), at least one round knife insert (5) that has at least one geometrically defined cutting edge (64) and a knife face (17), having a clamping device (11) that fixes the knife insert (5) to the main body (3), wherein the clamping device (11) has a clamping shoe (13) that acts on the knife face (17), and wherein the force of the clamping shoe (13) is directed such that the knife insert (5) is pressed with its rear side (19), opposite the knife face (17), against a contact region (21) of the tool (1). The tool (1) is distinguished by the fact that it has an indexing unit (25) comprising a coupling element (27) that is rotatable with respect to the main body (3) and has the contact region (21) for the knife insert (5), said coupling element (27) being coupled to the knife insert (5) for conjoint rotation, an indexing device (47) that is connected to the coupling element (27) for conjoint rotation, and a drive device (35) for indexing the coupling element (27) through a defined rotation angle.

Description

Tool for machining workpiece surfaces

description

The invention relates to a tool for machining workpieces according to the preamble of claim 1. The invention also relates to a round blade plate having the features of claim 13.

Tools of the type discussed here, ie those with a round blade plate, are used for machining of workpiece workpiece surfaces. When machining the workpiece, the cutting edge of the circular blade plate wears in a certain area. This depends on the depth of cut, the feed and the radius of the knife plate or its cutting edge. After a certain amount of wear, the blade plate is rotated by a certain angle of rotation and used in a new rotational position for machining the workpiece surface. By further rotation of the blade plate reaches an intact area of the cutting edge into engagement with the workpiece to be machined. Knife plates of the type mentioned here have very wear-resistant and expensive cutting materials at high demands on the surface quality or service life of the tool, at least in the area of the cutting edge, for example PCBN (polycrystalline boron nitride) or PCD (polycrystalline diamond). The blades can also consist entirely of these materials. Consequently, it is advantageous that, after wear of a region of the cutting edge, the round blade plate is only rotated so far that the wear regions of the cutting edge which arise during the machining of a workpiece are as direct as possible. connect to each other so that the entire circumference of the knife plate, ie the peripheral cutting edge, can be fully utilized.

In known tools projections or depressions are provided for positioning the cutting edge on the knife edge or on the opposite side, for example, a number of wells or star-shaped arranged notches. Either a clamping device cooperating with the knife breast engages in these projections or depressions, or it is provided that projections or depressions interact with corresponding structures which are provided in the contact region of the knife plate. A disadvantage of blades of this type is that the production of such complex contours is expensive and expensive.

Moreover, it has proved to be disadvantageous that when loosening the clamping device of the time required is often very large, because the clamping device must be solved so far that the projections or depressions are completely released, that is, no longer intermesh to a rotation of the To allow knife plate. This loss of time means a cost-causing stoppage of a machine tool, in which a tool of the type mentioned here is used.

The object of the invention is therefore to provide a tool which does not have these disadvantages.

To solve this problem, a tool for machining of workpiece surfaces of the type mentioned above is proposed, which is characterized by an indexing unit. This has a relative to the main body of the tool rotatable Coupling element with a contact area for the blade plate, wherein the coupling element and the blade plate are rotatably coupled together. In addition, a rotatably connected to the coupling element indexing device is provided, which ensures that a blade plate by means of the indexing unit in each case only by a certain angle of rotation is rotatable. Finally, the indexing unit has a drive device for stepwise rotation of the coupling element, so that an indexing of the blade plate is possible in a simple manner. In such a trained tool, it is possible in a simple manner, after machining a workpiece to rotate the blade plate by a predetermined by the indexing rotation angle, so that the worn portion of the cutting edge can no longer engage with the workpiece surface to be machined. By gradually turning the blade plate can also be ensured that the blade plate is not indexed by a large angle of rotation, so that the geometrically formed cutting edge of the blade plate is optimally utilized.

In a particularly preferred embodiment, it is provided that the indexing unit has a variable indexing device. By this is meant that the indexer is either interchangeable, or has different sections, which are characterized in that the blade plate is indexable by different angles of rotation. Further embodiments emerge from the subclaims.

The object of the invention is also to provide a blade plate, which serves to avoid the disadvantages mentioned. To solve this problem, a round blade plate for a tool of the above type is created, which has a flat knife breast and a running at a distance to the rear, with a center axis of the blade plate is perpendicular to the knife breast and on the back. The blade plate is characterized in that on its rear side a positive locking element is provided, which is designed and / or arranged so that it interacts with a counter-form-locking element on the tool such that a torque can be introduced into the blade plate. The knife plate is also characterized by the fact that its knife breast has an intact clamping surface.

The intact clamping surface serves for the installation of a clamping element, for example, the installation of a clamping claw of a clamping device, as it is usually used for the attachment of knife plates. The clamping claw acting on the knife edge on the one hand ensures that the interlocking element and the counter-form-locking element engage in one another and realize a positive connection, so that a rotationally fixed fixation of the knife plate is effected. The clamping surface of the knife breast is intact, that is, the knife plate does not, as usual, on a through hole for a clamping screw, by means of which it is fixed to the tool.

Further embodiments of the blade plate will become apparent from the accompanying dependent claims. The invention will be explained in more detail below with reference to the drawing. Show it: Figure 1 is a perspective view of a tool with a round blade plate;

Figure 2 is an enlarged perspective view of the front part of the tool; 3 shows a schematic section through the front part of

Tool according to the view of Figure 2, and

Figure 4 shows the reproduced in Figure 3 section in an exploded view.

Figure 1 shows the tool in a perspective view obliquely from the front. The design of the tool 1 is so far irrelevant to its implementation according to the invention insofar as it can be a turning tool, as shown in FIG. 1, but it can also be designed as a milling cutter, drill or the like. It is crucial that it has at least one insertable into the main body 3 of the tool 1 round blade plate 5. In the embodiment of the tool 1 shown here, it is provided that the knife plate 5 is formed as a cylindrical body. But it is also possible to form the blade plate as a conical section-shaped body, or with a peripheral surface 7, which is concave retracted.

The tool 1 shown in FIG. 1 is a rotary holder which is provided here by way of example with a shaft having a square cross-section which can be clamped on a lathe. The shaft can, as will be readily borrowed, also be designed differently. In the formation of the tool 1 as a rotary holder is usually a rotating Workpiece along the blade plate 5 guided to remove chips from this and produce, for example, cylinder or flat surfaces. The realization of contours is possible by means of the tool. The knife plate 5 is fixed by a clamping device 1 1 on the base body 3 of the tool 1, wherein the clamping device 1 1 here has a clamping claw 13 which rests on a designated knife edge 17 top of the blade plate 5 and thus the blade plate 5 with its parallel to the knife breast 17 extending back 19 against a contact area 21 presses. The clamping claw 13 may - as provided in the embodiment shown here - have a clamping lip 15; but this is not necessary.

The knife breast 17 has an intact clamping surface, in the region of which the clamping claw 13 rests. The blade plate 5 thus has no through hole for a clamping screw, as is often the case with conventional blade plates, wherein the clamping screw serves to fix the blade plate on the main body of a tool. Rather, it is provided that the clamping claw 13 rests on a clamping surface, which currently has no through hole, also no clamping grooves, which are provided with conventional blade plates, so that there can engage a clamping lip and causes a positive locking a rotation of the blade plate. In the case of the knife plate according to the invention, unlike in the case of such known knife plates, it is provided that the clamping surface is undamaged, ie flat, and forms no positive connection with the clamping claw on it. The clamping claw 13 is fixed with a clamping screw, not shown here in the base body 3, which passes through a through hole 23 in the clamping claw 13, which is provided on the clamping lip 15 opposite end of the clamping claw 13. FIG. 1 shows that the knife breast 17 -, in particular in the region of a clamping surface on which the clamping claw 13 or its clamping lip 15 rests - is designed to be flat, that is to say it has no elevations or recesses, as provided in conventional knife plates 5 and For example, cooperate with the clamping lip 15 in order to realize a defined rotational position of the blade plate 5 in the main body 3 of the tool 1. The knife plate 5 can thus be tightened in any rotational position with respect to the clamping lip 15 on the base body 3. The tool 1 has an indexing unit 25, which encompasses a coupling element 27 rotatable relative to the base body 3, whose top side facing the blade plate 5 comprises the contact area 21 on which the blade plate 5 rests.

The coupling element 27 is here exemplified as a cylindrical body or as a disc whose parallel to the top extending bottom 29 rests on a formed in the base body 3 contact surface 31 on which the central axis 33 of the blade plate 5 is vertical. This central axis 33 is also perpendicular to the contact region 21 of the coupling element 27 and on the knife edge 17 and the rear side 19 of the blade plate 5. The outer diameter of the coupling element 27 is preferably smaller than that of the blade plate. 5 The coupling element 27 is rotatably mounted in the base body 3 of the tool. A rotation of the coupling element 27 about the central axis 33 can be effected by a drive means 35 of the indexing unit 25, which here comprises a rotary knob 37, the peripheral surface 39 includes, for example, a knurl to increase the grip of the knob 37.

The drive device 35 of the indexing unit 25 is rotatably coupled to the coupling element 27, which in turn is non-rotatably coupled to the blade plate 5. In this way it is achieved that a torque introduced into the drive device 35 leads to a rotation of the coupling element 27 and thus the blade plate 5, when the blade plate 5 is not tightened.

The drive device 35 may also, in a departure from the embodiment shown here, be realized in that in the lower end of the indexing unit 25, a recess is formed, which is designed for the engagement of a tool. With this, a rotation of the coupling element 27 can be effected, as is possible by means of the rotary knob 37.

FIG. 1 also shows an indexing unit 25. This serves to allow a rotation of the coupling element 27 and thus of the blade plate 5 by a defined angle of rotation, ie an indexing of the blade plate 5 when a torque is introduced into the drive device 35. The knife plate 5 is rotated about its central axis 33 by means of the indexing unit 25, as is the coupling element 27.

Figure 2 shows an enlarged perspective view of the front part of the tool 1 according to Figure 1, but from another Line of sight. While FIG. 1 shows the tool 1 obliquely from the front, FIG. 2 shows a view from which the tool according to the illustration in FIG. 1 is reproduced from the front right. In the enlarged view of the shaft 9 of the tool 1 is not shown in full length. The same parts are provided with the same reference numerals, so that reference is made to the description of Figure 1.

Clearly visible is the round blade plate 5, which is pressed by the clamping device 1 1 against the coupling element 27 of the indexing unit 25. Figure 2 also shows the drive unit 35 which is provided in the embodiment of the tool 1 shown here with the knob 37, by means of which the coupling element 27 can be rotated. Since the latter is non-rotatably coupled to the round blade plate 5, the round blade plate 5 is also rotated during a rotation of the rotary knob 37.

Right at a distance from the indexing 5 an opening 41 in the base body 3 can be seen, which is assigned to a introduced into the base body 3 of the tool 1 bore 43. These will be discussed in more detail below. FIG. 3 shows a schematic section through the front part of the tool according to FIG. 2. Here, too, the same parts are provided with the same reference numbers, so that reference is made to the description of FIGS. 1 and 2.

FIG. 3 thus again shows the enlarged front part of the tool 1, the shaft 9 of which is not shown in full length. Clearly visible is the opening 41 with the bore 43 through the base body 3 of the tool 1 in the direction of the indexing unit 25 extends.

Recognizable here is also the clamping device 1 1, the clamping claw 13 presses the knife plate 5 against the contact region 21 of the coupling element 27 with tightened clamping screw, which is rotatably coupled to the blade plate 5. As a result, the coupling element 27 is pressed against the contact surface 31 and held against rotation.

But if the clamping claw 13 is only slightly dissolved and only a reduced force exerted on the knife edge 17 of the blade plate 5, the indexing unit 25 is freely rotatable in the main body 3 of the tool 1, so that the mesher plate. 5

Well visible here is the drive means 35 with the knob 37, which is rotatably connected to the coupling element 27. It turns out here that the rotary knob 37 is rotatably coupled via an indexing shaft 45 with the coupling element 27 whose axis of rotation coincides with the central axis 33.

From the sectional view according to FIG. 3 it can be seen that the indexing unit 25 also comprises an indexing device 47. This is characterized by depressions 49 and / or elevations 51, which are introduced into a preferably cylindrical surface 53. In the embodiment of the indexing device 47 shown here, it is provided that in the surface 53 upwardly open grooves are realized with intermediate webs, wherein in this embodiment, the surface 53 has a larger diameter than the indexing 45. The special However, gene 49 may also be formed as troughs or holes, so have a closed edge.

In this embodiment, it is also provided that the knob 37 has a larger outer diameter, as the area with the cylindrical surface 53. Thus, there are between the knob 37, the cylindrical surface 53 and the surface of the indexing 45 each stages, but not are mandatory. It also turns out that the length of the indexing shaft 45 depends on the size of the tool. If necessary, it can be omitted for small tools, so that the indexing device 47 virtually merges into the coupling element 27.

With the recesses 49 and / or the elevations 51, a latching element 55 arranged in the bore 43 cooperates, which engages into the intermediate spaces between the elevations 51 and into the recesses 49. Preferably, the locking element 55 is designed so that it engages with a resilient force, which is preferably constructed by means of a spring, in the intermediate spaces between the elevations 51 and in the depressions 49. For example, the latching element 55 may have a sleeve-shaped main body 57 whose outer diameter is matched to the inner diameter of the bore 43 so that the latching element 55 can be guided and pressed to a desired position within the bore 53.

In a further embodiment, it is provided that the main body 57 of the locking element 55 has an external thread, which cooperates with a not-shown internal thread in the bore 43. In this way, the locking element 55 are introduced through the opening 41 in the base body 3 of the tool 1 and screwed into a desired depth in the bore 43. At the indexing device 47 facing the end of the main body 57 preferably protrudes a spring-loaded serving as a detent body ball 59, which engages in the space between the elevations 51 and 49 in the recesses, that is, the ball 59 is by a spring against the outer surface the indexer 47 pressed. If a torque is introduced into the knob 37, the ball 59 can be pushed back against its bias in the body 57, so that the indexing device 47 can be gradually rotated by a certain angle, that is indexed, the angle of rotation of the circumferential direction to the central axis 33rd measured distance of the recesses 49 and elevations 51 depends.

From Figure 3 it is clear that the knob 37 engages slightly into the base body 3 of the tool 1 and cooperates with a lower contact surface 52 so that the indexing unit 25 in the axial direction, that is seen in the direction of the central axis 33, with a slight play in the body 3 is fixed in position. The contact surface 52 prevents an upward movement and the bearing surface 31, against which the underside 29 of the coupling element 27 bears, a downward movement of the indexing unit 25.

In a modification to the illustration of Figure 3, it is possible, the knob 37 - measured in the direction of the central axis 33 - longer, so that it further engages in the body, and on the peripheral surface 39 recesses and elevations provided, as in connection with the indexing device 47 was written. The indexing device can therefore also be part of the rotary knob 37 and thus of the drive device 35.

Moreover, it is also possible to provide depressions and elevations directly on the peripheral surface 61 of the indexing shaft 45, so that it is then part of the indexing device 47. Finally, it is possible to provide depressions and elevations on the peripheral surface 63 of the coupling element 27. Thus, the coupling element 27 would be part of the indexing 47th

When changing the position of the recesses 49 and elevations 51 relative to the position shown in Figure 3, it is necessary to adapt the arrangement of the locking element 55 so that it can cooperate with the recesses and elevations, so that upon rotation of the knob 57 by the resilient latching By means of the latching element 55, different rotational locking positions of the coupling element 27 of the indexing unit 25 can be realized, whereby correspondingly defined rotational positions of the blade plate 5 can be set.

In the ready state of the tool 1, the blade plate 5 is pressed by means of the clamping claw 13 of the clamping device 1 1 against the coupling element 27, so that the coupling element 27 rests firmly against the contact surface 31 in the base body 3 of the tool 1, such that a rotation of the coupling element 27th is not possible due to the existing frictional forces between this and the base body 3. Characterized the rotatably coupled to the coupling element 27 blade plate 5 is fixed in the main body 3 of the tool 1 so that an unwanted rotation of the blade plate 5 is not possible. If, during the machining of a tool, a certain circumferential area of the knife plate 5, namely a region of the cutting edge 64 worn, the contact force of the clamping claw 3 on the knife face 17 is reduced so far that the knife plate 5 and the coupling element 27 by introducing a torque can be rotated in the drive device 35.

By the action of the indexing device 47 it is ensured that upon a rotation of the rotary knob 37, the locking element 55 only permits a stepwise rotation or indexing. For an operator, it is thus possible in a simple manner, to rotate the blade plate 5 by a defined angle of rotation.

The angle of rotation can be chosen so that a rotation of the blade plate by a plurality of locking steps is necessary, that is done by a plurality of partial rotation angle, which are given by the interaction of the locking element 55 with the indexing device 47.

If the blade plate 5 is rotated by a desired angle of rotation, possibly by a number of partial rotations, the clamping device 1 1 is activated again so that the clamping claw 13 presses firmly on the knife face 17 and thus exerts a contact pressure on the coupling element 27, which then is pressed against the contact surface 31 in order to fix the blade plate 5 and the indexing unit 25 in a rotationally fixed manner in the base body 3 of the tool 1.

In the embodiment shown here, a clamping screw 65 is introduced into the provided with an internal thread through hole 23 of the clamping device 1 1, which with an internal thread in the through hole 23 and with an internal thread in a two- th through hole 67 in the main body 3 cooperates. The tensioning screw 65 preferably has two threaded sections equipped with opposing threads. On the tension of the clamping device 1 1 and the fixation of the blade plate 5 in the base body 3 of the tool 1 is not discussed here, because this is a known to a person skilled in the art. Of course, it is possible to design the clamping device 1 1 with other clamping means.

It is essential that the knife breast 17 of the blade plate 5 is formed flat, in particular in the area of the intact clamping surface, that is, has no recesses provided for the engagement of the clamping lip and / or elevations, as is the case with conventional blade plates. If, therefore, the clamping force of the clamping claw 3 on the knife breast 17 is only slightly reduced, it is possible to rotate the knife plate 5 by means of the coupling element 27 of the indexing device 47 mounted rotatably in the main body by a certain angle. That is, usually requires only a rotation of the clamping screw 65 by a quarter to a half turn to reduce the clamping force of the clamping claw 13 on the knife face 17 so far that an actuation of the indexing device 47 and thus a rotation of the blade plate 5 relative to the base body 3 of the tool 1 is possible. With conventional blade inserts, the clamping claw must be loosened until the clamping lip releases the recesses or elevations and the lock is released. In this case, the clamping screw must be turned more frequently until the knife plate can be rotated. This results in a higher expenditure of time. Figure 4 shows the reproduced in Figure 3 tool, but in an exploded view. The same parts are provided with the same reference numerals, so reference is made to the description of the preceding figures. The knife plate 5 is tightened by means of the clamping device 1 1 in the main body 3 of the tool 1 characterized in that the clamping screw 65 is screwed through the through hole 23 until it engages in the through hole 67. By the clamping lip 15 of the clamping claw 13, the blade plate 5 is pressed against the coupling element 27 of the indexing unit 25, against the contact region 21 of the coupling element 27. Between the plant area 21 facing the rear side 19 of the blade plate 5 and the contact area 21 is a positive connection provided such that a relative rotation between the blade plate 5 and coupling element 27 is excluded at least in the pressed state.

The positive connection between the rear side 19 of the blade plate 5 and the abutment portion 21 of the rotatable coupling element 27 is realized in that on the back 19, a positive locking element is provided which cooperates with a counter-form-locking element in the contact region 21 of the coupling element 27, in such a way that over Indexing 25 a torque in the blade plate 5 can be introduced. In this way, the blade plate is rotatable at a wear of the cutting edge. The interlocking element is formed and / or arranged so that a force acting at a distance from the central axis 33 force, which is preferably directed perpendicular to an imaginary central axis 33 intersecting diameter line, causes a rotation of the blade plate 5. In a preferred embodiment, it is provided that the form-fitting element and the Gegennnnschlusselennent are complementary and engage. In order to realize the positive connection between the knife plate and the coupling element, it is preferably provided that the positive-locking element is designed as a recess and the counter-form-locking element is designed as a projection. This is because it is cheaper, especially in very hard materials used in connection with a knife plate, there to provide a recess or depression. It is much more complex and costly to build a head start. In principle, however, it is also very possible to realize the form-fit element as a projection and the counter-form element as a recess.

It can be seen in FIG. 4 that in the exemplary embodiment illustrated here, at least one projection, preferably formed as a substantially cylindrical pin 69, originates from the abutment region 21 of the coupling element 27, to which a further pin is preferably assigned diametrically opposite one another. This is not visible in the representation selected here. The pin 69 engages in the back 19 of the blade plate 5, where a corresponding recess or recess for the pin 69 is provided. The recess is designed and arranged such that a positive connection between the knife plate 5 and the coupling element 27 is effected in such a way that a relative rotation between the two parts is not possible. The pin 69 and the associated recess are offset, that is arranged at a radial distance from the central axis 33. The non-rotatable coupling between the blade plate 5 and coupling element 27 can be done in any way. The at least one pin 69 is listed here by way of example only. In principle, it can also originate from the rear side 19 of the knife plate 5. However, it is rather expensive and cheaper to provide the knife plate 5 on its rear side 19 with a recess for the pin 69 that springs from the contact surface 21. As a recess may also serve a groove in the back 19 of the blade plate 5, which preferably extends in the radial direction to the central axis 33. The side walls of the groove then serve as a stop for the pin 69 engaging in the groove in order to prevent a relative rotation of the knife plate 5 about the central axis 33 with respect to the coupling element 27.

The coupling element 27 is connected to the remainder of the indexing unit 25 by means of a screw 71, which engages in the indexing shaft 45. The connection between coupling element 27 and Indexierwelle 45 ensures that no relative rotation is possible here. Any other attachment of the coupling element 27 to the indexing shaft 45 is also possible, whether by gluing, soldering, welding or the like.

In the exemplary embodiment illustrated here, the indexing shaft 45 is formed integrally with the indexing device 47 and the drive region 35. However, it is possible to form the three elements separately and to couple with each other rotationally fixed. An essential aspect is that the cutting edge 64 of the blade plate 5 is subject to wear during the machining of a workpiece over a certain circumferential area, wherein the Size of the peripheral region is dependent on the depth of cut, the feed and the radius of the cutting edge 64 of the blade plate 5. Also other parameters, such as the cutting speed, the material of the blade plate and the workpiece to be machined can also play a role here.

In order to be able to optimally utilize the peripheral cutting edge 64 of a knife plate 5, the knife plate 5 is preferably further rotated or indexed as accurately as possible by a certain angle of rotation, if necessary by a number of partial angles of rotation, so that an intact, undamaged region of the cutting edge 64 follows the turning of the blade plate 5 engages with the workpiece to be machined. In particular, it is preferred that the intact cutting region directly adjoins the worn cutting region. An overlapping of the cutting regions in the sense that an already worn region of the cutting edge comes into engagement with the workpiece after the turning of the knife plate is preferably completely avoided. If, as a precautionary measure, the knife plate is turned further so that there is a space between an already worn area of the cutting edge and the cutting area which is subject to wear in the subsequent machining process, the cutting edge is not optimally utilized.

In order to be able to use one and the same blade plate 5 when working under different working conditions, it is provided that the indexing device 47 is designed to be interchangeable and variable: it is thus possible to remove an indexing device 47 from a tool 1 and to feed it through another indexing device in which the depressions and / or elevations tions are arranged at a different circumferential distance from each other. When turning the knob 57 thus result depending on the indexing device 47 different sized rotation angle at each set by the locking element 55 rotation step. This makes it possible to adapt the rotation of a blade plate to various processing parameters and to use identically designed blade plates 5 under different processing conditions.

A largely optimized possibility is to use an indexing device 47, the recesses 49 and elevations 51 in a relatively narrow circumferential distance from each other, so that at each latching step, the blade plate is further rotated by a small angle of rotation. During further rotation of the knife plate 5, an operator can count the latching steps and set an optimum defined angular range by which the knife plate 5 is rotated step by step in the event of wear. If the distance between the recesses and elevations is relatively small, the blade plate 5 only rotates by a small angle of rotation during each latching step. If the distance between the depressions and elevations is relatively large, a twisting of the blade plate results per latching step by a larger angle of rotation.

Preferably, the indexing device 47 is designed so that the circumferential distance of the recesses and / or elevations is selected so that per locking step, a rotation angle of 5 ° to 20 ° is realized. In particular, a grid of 10 ° or 15 ° is preferred in order to realize different angular positions per latching step during the rotation of a knife plate. It is crucial that the blade plate 25 can always be formed the same due to the use of the indexing unit described here, which significantly reduces the cost of the blade plate and thus a tool of the type discussed here. Irrespective of the configuration of the knife plate 5, the rotational angle or partial rotational angle given by the configuration of the indexing unit 25 or the indexing device 47 results from the spacing of the depressions and elevations, measured in the direction of rotation, indicating the angle of rotation or the partial rotation angle.

Finally, it is possible to provide 25 depressions 49 and elevations 51 in different regions of the indexing unit, which have a different pitch. For example, the knob 57 may project so far into the main body 3 of the tool that it has on its peripheral surface 39 recesses and elevations at a relatively large distance (measured in the circumferential direction). A further area above the rotary knob 37 can, as shown in FIGS. 3 and 4, be provided with an indexing device 47 in which the spacing of the recesses and elevations deviates from those provided on the peripheral surface 39 of the rotary knob 37.

In addition, in the region of the indexing shaft 45, a section may be provided which has depressions and elevations, which in turn have a different distance from each other, measured in the circumferential direction.

It is now possible, in deviation from the illustrations in FIGS. 3 and 4, to provide a number of latching elements in the main body 3. hen, each cooperating with a portion having recesses and elevations. Depending on which of the latching elements is brought into engagement with the indexing device, the coupling element 27 or the blade plate 5 is rotated by a different angle of rotation per raster when a torque is introduced into the indexing unit 25 in the drive region 35, ie when the rotary knob 37 is rotated ,

Since the base body 3 of the tool 1 could be weakened too much by a plurality of bores 43 for a latching body 55, it is preferable to design the indexing unit 25 so that the indexing device 47 is interchangeable and with different rasters with respect to the spacing of recesses and elevations measured in the direction of contact can be trained. Depending on the wear of the blade plate in certain cases, then various indexing 47 can be used, with always the same configuration of the blade plate is used.

The tool according to the invention and the inventively designed knife plate act together so that a rotation of the blade plate 5 with a wear of a portion of the cutting edge 64 relative to the main body 3 of the tool 1 is already possible when the clamping claw 13 of the clamping device 1 1 is only slightly relieved , A rotation of the clamping screw 65 in the release direction by a quarter to a half turn is sufficient, because the clamping claw 13 rests on an intact clamping surface of the Mes masters breast 17, and here no positive locking is realized. By relieving the clamping claw, the blade plate 5 is pressed only with reduced force against the associated coupling element 27 and against the contact area 21, so that the Coupling element 27 is pressed only with reduced force against the contact surface 31 in the main body 3 of the tool 1.

It is therefore not necessary and not desirable to loosen the clamping screw 65 so far that the positive connection between the blade plate 5 and the coupling element 27, which prevents relative rotation between the two elements, is repealed. Rather, it is possible, after a slight discharge of the clamping claw 13 by introducing a torque in the coupling element 27 and thus in the blade plate 5 to cause the desired rotation of the blade plate. In this case, upon introduction of a torque into the drive device 35 of the indexing unit 25, not only the coupling element 27 but also the knife plate 5 is rotated due to the positive connection, wherein the rotation is effected stepwise by angles of rotation which are defined by the indexing device 47. This acts independently of the design of the blade plate and allows a rotation of the same by a desired angle of rotation.

It is thus possible, by means of the indexing unit 25 to rotate identical blades 5 by different angles of rotation, wherein the angle of rotation can be chosen differently by the design of the indexing device 47. In this case, it is possible to design an indexing device such that when a torque is introduced, the knife plate 5 is rotated by such a small partial rotation angle that adaptation to different wear situations is possible by selecting the number of partial rotation angles. In particular, it is provided that the indexing unit 25 as a whole is exchangeable, or has a replaceable indexing device 47, so that at different intervals - in the circumferential direction seen - arranged elevations and depressions cooperate with a latching element to adjust different angles of rotation in one and the same type of blade plate in different wear situations can.

Claims

claims

1 . Tool for machining workpiece surfaces, with

a base body (3),

at least one round knife plate (5) having at least one geometrically defined cutting edge (64) and a knife breast (17),

- with a knife plate (5) on the base body (3) fixing the clamping device (1 1),

- wherein the clamping device (1 1) has a force acting on the knife face (17) clamping claw (13), and

- Wherein the force of the clamping claw (13) is directed so that the knife plate (5) with its the knife breast (17) opposite back (19) against a contact area (21) of the tool (1) is pressed, characterized in that

- The tool (1) has an indexing unit (25), comprising

A coupling element (27) rotatable relative to the base body (3) with the contact area (21) for the knife plate (5), which is non-rotatably coupled to the knife plate (5), • a non-rotatably connected to the coupling element (27) indexing device (47), and

• A drive device (35) for indexing the coupling element (27) by a defined angle of rotation.

2. Tool according to claim 1, characterized in that the coupling element (27) is positively coupled to the blade plate (5).

3. Tool according to claim 1 or 2, characterized in that the indexing device (47) recesses (49) and / or elevations (51), which cooperate with a latching element (55).

4. Tool according to claim 3, characterized in that the indexing unit (25) has a variable indexing device (47).

5. Tool according to claim 4, characterized in that the indexing device (47) has at least two subsections which at different distances from each other arranged recesses (49) and / or elevations (51).

6. Tool according to claim 4, characterized in that the indexing device (47) is replaceable.

7. Tool according to claim 3, characterized in that the latching element (55) has a spring-loaded latching body (59) which engages in the recesses (49) or in the free spaces between adjacent elevations (51).

8. Tool according to claim 1, characterized in that the knife plate (5) is gradually rotatable about a defined angular range.

9. Tool according to one of the preceding claims 1 to 8, characterized in that the coupling element (27) and / or the indexing device (47) and / or the drive means (35) by an indexing (45) are rotatably connected.

10. Tool according to claim 1, characterized in that the knife plate (5) in the region of its knife edge (17) is formed flat.

1 1. Tool according to claim 1, characterized in that the drive device (35) has a drive wheel (37) and / or an engagement region for a tool.

12. Tool according to claim 1 1, characterized in that the drive wheel (37) has a knurling in the engagement region.

13th round knife plate for a tool (1) according to one of claims 1 to 12, with a central axis (33) with a flat knife breast (17) on which the central axis (33) is perpendicular, and with a parallel to the knife breast (17 ) extending back (19), characterized in that

- The back (19) has a form-locking element which is formed and / or arranged so that it cooperates with a tool (1) provided Gegenformschlusselement so that a torque in the blade plate (5) can be introduced, and that the knife breast (17) has an intact clamping surface.

14 round blade plate according to claim 13, characterized in that the positive-locking element and the Gegenfornnschlusselennent are formed complementary.

15 round blade plate according to claim 13 or 14, characterized in that the positive-locking element as a recess and the Gegenfornnschlusselennent are formed as a projection, or that the positive-locking element as a projection and the Gegenfornnschlusselennent are formed as a recess.

16 round knife plate according to claim 15, characterized in that the projection is designed as a preferably cylindrical pin (69) and the recess as a bore.

17. Round knife plate according to claim 15, characterized in that the projection as a preferably cylindrical pin (69) and the recess is formed as a groove with side edges, in particular radially to the central axis (33) and has a width that they the pin ( 69), and that their side walls form a stop for the pin (69) to prevent relative rotation between the knife plate (5) and the coupling element (27).

18. Round knife plate according to one of the preceding claims 13 to 17, characterized in that it is substantially cylindrical.

19. Round knife plate according to one of claims 13 to 18, characterized in that the Gegenfornnschlusselennent on a contact surface (21) of a coupling element (27) of an indexing unit (25) is provided.