EP1767318B1 - Chip removing cutting tool - Google Patents

Abstract

The cutting tool for wooden workpieces has a circular saw rotated around an axis. The saw has peripheral cutters (6) defining teeth with one part as a separating cutter and swarf cutter. The cutter has a peripheral edge blade (8,9) and a one sided axially extending lateral blade (10). The cutters each have a cut out (26) at the corner (14,16) at the mounting edge (11).

Description

The invention relates to a cutting tool, in particular for processing wood-based materials or the like, having the features according to the preamble of claim 1.

From the DE 101 07 881 A1 is a cutting tool with an approximately circular disk-shaped, provided for rotating drive about a rotation axis supporting body known, distributed over the circumference of a number of cutting teeth is arranged. The cutting teeth each consist of a integrally formed on the support body knife carrier, which is upstream of a flute in the direction of rotation. On the knife carriers formed as separate parts cutting blades of different design are attached.

A part of the cutting blade protrudes frontally in the axial direction on the support body and is designed as Trennschneidmesser for a fine cutting edge. Laterally offset in the axial direction, a number of cutting blades are arranged distributed over the circumference, which are wider compared to the Trennschneidmessern and provided as Zerspanschendmesser for cutting a wider projection.

Zerspanwerkzeuge the aforementioned design are used, for example, for the production of particle board or similar wood-like materials in order to bring them to a finished cut with a clean cut edge. For a clean cutting result, a high degree of sharpness and an exact mutual alignment, in particular the Trennschneidmesser required. A regularly performed re-sharpening process is time consuming and costly.

In particular, the Trennschneidmesser for a cutting tool of the aforementioned design are usually carried out with an approximately square plan. The quadrangular Grundgriß can be parallelogram or diamond-shaped or designed as an irregular square. In this case, a peripheral and a one-sided, axially projecting beyond the support body side cutting is provided. These two cutting edges are each faced with mounting edges, in the area of which there is a mounting surface, for example for soldering to the bearing-side knife carriers. Along the two cutting edges and the two mounting edges run imaginary lines, which intersect in four corners and thus describe the above-mentioned quadrilateral. In one of the vertices of this quadrilateral, the peripheral edge and the lateral edge converge. The two mounting edges converge in the diagonally opposite corner point. The cutting corner and the mounting surface are diagonally opposite each other, resulting in eccentric forces in the execution of the cut. To accommodate the resulting loads a sufficiently large mounting surface is required for soldering, in conjunction with the previously known quadrangular design of the cutting blade this receives a certain base with a predetermined length of the two cutting.

For a clean cutting result, a high number of teeth is sought, which in conjunction with the predetermined length of the cutting edges requires a high drive power. Another disadvantage is the high cost of re-sharpening, which is done in diamond materials of the cutting blade, for example, by eroding. A high number of cutting teeth must be resharpened over the entire length of both cutting, resulting in a high time and cost.

Also problematic is the replacement of a single damaged or chipped cutting blade. This is positioned as a new part, wherein a stop is used on the side edge opposite the lateral cutting edge. This stop is subject to tolerances and requires the adaptation to the other cutting blades the removal of a corresponding volume of material in the area of both cutting. This volume of material to be removed is increased even in the case in which the remaining cutting edges have already been sharpened one or more times before. The newly inserted cutting blade must be brought in the area of both cutting to the radial and axial dimensions of the other cutting blades.

The invention has the object of providing a cutting tool of the type described above in such a way that the maintenance cost is reduced.

The object is achieved by a cutting tool having the features of claim 1.

A cutting tool is proposed, in which at least one of the two cutting edges and in particular the lateral cutting edge in the region of that corner point which is assigned to the adjacent mounting edge, has a recess which extends this corner point, forming at least one additional edge. Preferably, both cutting edges of the cutting blade are each provided with a recess to form at least one such additional edge. The recess according to the invention causes a shortening of the associated cutting edge without adversely affecting the load bearing capacity in the region of the fastening surface. The at least one additional edge is outside the cutting area and therefore does not have to be sharpened or resharpened. The resharpened total length of the cutting edges or the corresponding material volume to be removed during resharpening is reduced. It has been found that, in particular on the lateral cutting edge, high frictional forces occur, which are reduced by the shortening of the cutting edge. Compared to the conventional design, a higher number of teeth and / or a smaller drive power can be selected.

The recess is expedient outside the mounting surface of the knife carrier and in particular adjacent to the mounting surface. With effective reduction of the blade length, the intended mounting surface remains unaffected with the associated load capacity of the solder joint.

The recess may be formed by one or more additional edges in any rectilinear or curved shape. In a preferred embodiment, the recess is formed by a single, especially rectilinear additional edge which is easy to handle in terms of manufacturing technology and which can serve to adjust the cutting edge relative to a reference surface during insertion in accordance with the more detailed description below.

In an expedient alternative, the respective recess is formed by two convexly arranged, in particular rectilinear, additional edges. The result is a convex notch, which clearly keeps the additional edges of the cutting edge of the workpiece and thus avoids a rubbing contact with the cutting edge or with chips.

The cutting blade provided with the recess is preferably the cutting blade and / or the cutting blade cutter in an embodiment, which is formed in its axially lateral region as Trennschneidmesser. The desired high number of teeth for the cutting blade causes a significant savings in Nachschärfaufwand and required drive power.

In an advantageous embodiment, the additional edge located in the region of the lateral cutting edge is aligned with a reference surface of the supporting body. The additional edge and the aligned reference surface lie in the region of the recess and thus away from the executive cut. simultaneously But they are also close to the lateral edge on the same side of the cutting tool. The lateral positional adjustment to be made during assembly of the cutting blade is increased in precision while avoiding tolerance chains. The effort for the subsequent material-removing machining to achieve an identical cutting contour of all cutting teeth is reduced.

The reference surface may be aligned radially inward to the additional edge. Preferably, the reference surface and the additional edge aligned therewith are at least approximately parallel to a plane of the support body and in particular with respect to a direction of rotation of the cutting tool behind the aligned with her additional edge. The precision of the lateral position alignment is improved. In projection on the direction of rotation, the reference surface does not take up any additional space, as a result of which the free spaces between the support body and the material to be cut can remain comparatively large.

Fig. 1

in perspektivischer Übersichtsdarstellung ein erfindungsgemäß ausgeführtes Zerspanwerkzeug mit einer Vielzahl über den Umfang verteilter Trennschneidmesser und einer geringeren Anzahl von Zerspanschneidmessern;

Fig. 2

eine radiale Draufsicht des Zerspanwerkzeuges nach Fig. 1 mit Einzelheiten zur geometrischen Anordnung der Schneidzähne;

Fig. 3

eine Frontansicht des Trennschneidmessers nach den Fig. 1 und 2 mit zwei diagonal gegenüberliegenden Aussparungen im Schneidenbereich;

Fig. 4

eine Frontansicht eines Zerspanschneidmessers nach den Fig. 1 und 2, welches in seinem seitlichen Stirnbereich als Trennschneidmesser entsprechend der Darstellung nach Fig. 3 ausgeführt ist;

Fig. 5

eine perspektivische Detailansicht des erfindungsgemäßen, Zerspanwerkzeuges mit Einzelheiten zu seitlichen Zusatzkanten an den Schneidmessern und dazu fluchtenden Bezugsflächen;

Fig. 6

das Trennschneidmesser nach Fig. 3 mit schematisch eingezeichneten Schärflinien zur Darstellung des Nachschärfvorganges;

Fig. 7

das Zerspanschneidmesser nach Fig. 4 mit den vorgenanten Schärflinien;

Fig. 8

eine Ausführungsvariante des Trennschneidmessers nach Fig. 6 mit einem spitzen Schneidenwinkel;

Fig. 9

eine Frontansicht eines dem Trennschneidmesser nach Fig. 8 zugeordneten Zerspanschneidmessers mit einem ebenfalls spitzen Schneidenwinkel.

Embodiments of the invention are described in more detail below with reference to the drawing. Show it:

Fig. 1

in a perspective overview representation of an inventively designed cutting tool with a plurality of distributed over the circumference Trennschneidmesser and a smaller number of Zerspanschneidmessern;

Fig. 2

a radial top view of the cutting tool after Fig. 1 with details of the geometric arrangement of the cutting teeth;

Fig. 3

a front view of the Trennschneidmessers after the Fig. 1 and 2 with two diagonally opposite recesses in the cutting area;

Fig. 4

a front view of a Zerspanschidmesser after the Fig. 1 and 2 , which in its lateral frontal area as Trennschneidmesser according to the illustration Fig. 3 is executed;

Fig. 5

a detailed perspective view of the cutting tool according to the invention with details of lateral additional edges on the cutting blades and aligned reference surfaces;

Fig. 6

the Trennschneidmesser after Fig. 3 with schematically drawn sharpening lines for displaying the re-sharpening process;

Fig. 7

the cutting blade after Fig. 4 with the above-mentioned sharpening lines;

Fig. 8

a variant of the Trennschneidmessers after Fig. 6 with a sharp cutting angle;

Fig. 9

a front view of the Trennschneidmesser after Fig. 8 associated Zerspanzneidmessers with a likewise acute cutting angle.

Fig. 1 shows in a perspective overview representation of an inventive cutting tool, which is intended for processing solid wood, chipboard or similar wood-like materials. The cutting tool has an approximately circular disk-shaped support body 1, which is provided for rotating drive about an axis of rotation 32 perpendicular and centered to the surface of the support body 1. Over the circumference of the support body 1, a number of cutting teeth 2, 3, 3 'is arranged, each consisting of integrally formed circumferentially on the support body 1 blade carriers 4, 5 and frontally soldered, formed as separate parts cutting blades 6, 7, 7'. Before each cutting tooth 2, 3, 3 ', a radially inwardly extending chip space 31, 32 is provided.

With a high number of teeth, the cutting blades 6 of the cutting teeth 2 are designed as Trennschneidmesser described in more detail below, while with a smaller number of teeth, the cutting blades 7, 7 'of the cutting teeth 3, 3' are formed as further described below Zerspanschendmesser. The cutting blades 6, 7, 7 'consist in the embodiment shown of polycrystalline diamond, but can also advantageously consist of monodiamond or hard metal. The support body 1 is formed together with the integrally formed thereon, radially projecting blade carriers 4, 5 of tool steel.

Fig. 2 shows a radial plan view of the cutting tool after Fig. 1 , The plurality of cutting teeth 2 with the cutters 6 designed as cutting blades protrude on one side in relation to the axis of rotation 32 axial direction on the support body 1 and form a parting plane 41, in which receives the machined, for better clarity, not shown workpiece receives a fine cut edge , Trained as Trennschneidmesser cutting blade 6 have only a small axial extent and cover in the opposite direction relative to the parting plane 41, the support body 1 is not or only slightly.

Opposite in the axial direction, a smaller number of cutting teeth 3 'is provided, whose cutting blades 7' designed as cutting blade cutters are fastened to associated knife carriers 5 '. The provided in comparison to the cutting blades 6 in significantly smaller numbers cutting blade 7 'have in the axial direction of a multiple width compared to the axial width of the cutting blade 6. In the illustrated embodiment, the flat cutting blade 7 'lie in a common plane with associated cutting blades 6, wherein between the two in the axial direction a distance remains.

Between groups of cutting blades 6 are occasionally arranged cutting teeth 3 with blade carriers 5 and attached cutting blades 7, which are offset in the circumferential direction to the cutting blades 7 'and which are also designed as Zerspanschendmesser. The cutting blades 7 extend in the axial direction, starting from the parting plane 41 via the cutting blades 6 and cover in projection on the circumferential direction of the axial gap between the cutting blades 7 'and the cutting blades 6 from.

The cutting blade 7 are shown in the illustration Fig. 4 formed in the region of the parting plane 41 geometrically comparable to the running as a cutting blade cutting blades 6. When performing a cut, the cutting blade 6 designed as a cutting blade produce in the parting plane 41 due to their high number of teeth and their cutting geometry described in more detail below a fine cut section, while separated from the cutting material 6 in the opposite plane to the parting plane 41 of the Zerspanwerkzeuges by means of Cutter cutting knife running cutting blade 7, 7 'coarse machined.

Fig. 3 shows a front view of the running as Trennschneidmesser cutting blade 6 after the Fig. 1 and 2 , which is fastened with a hatched indicated attachment surface 28 frontally on one of the aforementioned blade carrier 4 by soldering. Instead of a solder joint, another compound may be considered. The cutting blade 6 according to the invention has a peripheral cutting edge 9 and a one-sided, axially above the supporting body 1 (FIG. Fig. 2 ) protruding, in the parting plane 41 ( Fig. 2 ) lying lateral cutting edge 10. Running approximately parallel to the cutting edges 9, 10 and in each case opposite one another, the cutting blade 6 is provided with mounting edges 11, 12 which bound the fastening surface 28 laterally and radially inwardly. The peripheral cutting edge 9 is in the radial direction and the lateral Cut 10 in the axial direction on the mounting surface 28 forth.

Through the two cutting edges 9, 10 and the two mounting edges 11, 12 extend imaginary lines 17, 18, 19, 20, which intersect at four corners 13, 14, 15, 16 and span a rectangle 21 indicated by dashed lines. In the exemplary embodiment shown, the cutting edges 9, 10 and the mounting edges 11, 12 and the lines 17, 18, 19, 20 defined thereby run in a straight line. It can also be provided a slightly curved course. The spanned square 21 is a parallelogram in the embodiment shown. It may also be a diamond-trapezoidal or other quadrangular shape and in particular an irregular square be provided.

In the region of the corner point 15, in which the two cutting edges 9, 10 run against one another, a sharpened chamfer 34 is arranged, in order to avoid peak loading of the cutting edges 9, 10 in the region of the corner point 15. Diagonally opposite meet the two mounting edges 11, 12 in a sharp-edged angle at the corner 13th

In the region of the corner point 16, which is formed by the meeting of the lines 19, 20 of the lateral cutting edge 10 and the lower mounting edge 12, the lateral cutting edge 10 is provided with a recess 26. In the embodiment shown, two convexly arranged, rectilinear additional edges 22, 23 of the cutting blade 6 are formed by the recess 26. Through the recess 26, the lateral cutting edge 10 and the lower mounting edge 12th each formed shortened with respect to the corner point 16, whereby the corner point 16 is recessed from the contour of the cutting edge 6. The recess 26 lies in the axial direction outside of the mounting surface 28 and in the illustrated embodiment with the additional edge 23 directly adjoins the mounting surface 28.

The above applies analogously to a recess 27 of the cutting blade 6, which is arranged in the region of the diagonally opposite corner point 14. In this vertex 14, the line 18 of the peripheral edge 9 and the line 17 of the axially inner mounting edge 11 converge. Accordingly, the peripheral cutting edge 9 and the associated mounting edge 11 are formed shortened relative to the adjacent corner point 14. Again, the recess 27 is formed by two convexly arranged, rectilinearly extending additional edges 24, 25, whereby the corner point 14 is recessed from the contour of the cutting blade 6. The recess 27 is located in the radial direction outside of the mounting surface 28, wherein the adjacent to the mounting edge 11 end of the additional edge 25 also adjoins the mounting surface 28. Instead of the rectilinear additional edges 22, 23, 24, 25 shown here, additional edges with a curved course or the like may also be expedient.

The shortening of the cutting edges 9, 10 and the mounting edges 11, 12 with respect to the length of the associated lines 17, 18, 19, 20 is advantageously in the range of one quarter inclusive up to and including one half and in the embodiment shown is in each case about one third.

Fig. 4 shows a front view of the cutting blade 7 after the Fig. 1 and 2 , which along with its associated mounting surface 29 in the axial direction in comparison to the cutting blade 6 after Fig. 3 is broader. In its region adjoining the lateral cutting edge 10, the cutting blade 7 is identical in its contour to the cutting blade 6 Fig. 3 formed, as is apparent from the inserted indicated, dash-dotted contour of the cutting blade 6. Outside the dot-dashed contour of the cutting blade 6, the cutting blade 7 is provided with a peripheral cutting edge 8, which extends in a straight line as well as the radially inner mounting edge 11 to the corner 14. In the area of the corner point 14 no recess is provided. The cutting blade 7 is on the associated blade carrier 5 ( Fig. 2 ) aligned with respect to the mounting surface 29 so that its to the parting plane 41 ( Fig. 2 ) adjacent area to the leading and trailing cutting blades 6 is aligned. Accordingly, the cutting blade 7 formed as Zerspanschändmesser is formed in this axially lateral region and the associated peripheral region as Trennschneidmesser with a peripheral cutting edge 9 and a lateral cutting edge 10. The peripheral cutting edge 9 is straight and without interruption in the peripheral edge 8 of Zerspanschneidmessers over. In the other features and reference numeral, the cutting blade 7 is correct Fig. 4 with the cutting blade 6 after Fig. 3 match. In particular, is in Region of the corner 16 a geometrically identical recess 26 is provided.

Fig. 5 shows a perspective detailed view of the cutting tool after the Fig. 1 and 2 in the peripheral area. A direction of rotation of the cutting tool with the support body 1 is indicated by an arrow 36. An axial direction is indicated by a double arrow 38.

It can be seen that the cutting edges 6, 7 in the direction of rotation 36 frontally or on the front of the associated blade carrier 4, 5 are arranged. The knife carrier 4, 5 have for adjusting the position of the cutting blades 6, 7 approximately in the axial direction 38 extending, in cross-section approximately L-shaped recesses, which are not shown here and in which the cutting blades 6, 7 are used. By the L-shaped recesses, the cutting blades 6, 7 are fixed in the radial direction and in the direction of rotation 36. In the not yet soldered state they are displaced in the axial direction 38. For positional adjustment of the cutting blades 6, 7 in the axial direction 38 before and during the soldering, the knife carriers 4, 5 on their parting plane 41 (FIG. Fig. 2 ) associated side each have a reference surface 35 which in the region of the lateral cutting 10 ( Fig. 3, 4 ) lies. The reference surfaces 35 are milled or ground from the material of the knife carrier 4, 5. By the additional edges 23 and the thickness of the cutting blades 6, 7 lateral alignment surfaces 37 are formed on the cutting blades 6, 7, which in the axial direction inwardly of the lateral cutting edges 10 (FIG. Fig. 3, 4 ) and thus of the workpiece to be produced on the cutting edge are kept free. The reference surfaces 35 are in the illustrated embodiment with respect to the direction of rotation 36 of the cutting tool behind the additional edge 23 and the associated alignment surface 37 of the respective cutting blade 6, 7. The reference surface 35 and the alignment surface 37 and the additional edge 23 form a common plane, at least approximately parallel to an in Fig. 2 indicated level 33 of the support body 1 is located. The additional edge 23 and the associated alignment surface 37 are thus aligned with the associated reference surface 35 with respect to the direction of rotation 36. It may also be desirable to have a radially inward alignment of the alignment surface 37 and the associated reference surface 35. By means of a attached to the reference surface 35, not shown attack can be moved with its alignment surface 37 in the axial direction 38 against this flat, abutting against the reference surface 35 during assembly, the respective cutting blade 6, 7, whereby a tolerance minimized, on the Side of the lateral cutting edge 10 ( Fig. 3, 4 ) Position adjustment of the cutting blade 6, 7 is given in the axial direction 38. In this way, the cutting knives 6, 7 are adjusted in the area of the attachment surfaces 28, 29 (FIG. Fig. 3, 4 ) soldered to the faces of the blade carrier 4, 5. It may also be expedient to provide an at least approximately in the axial direction 38 and the circumferential direction 36 extending reference surface, with the additional edge 22 of the cutting blade 6, 7 (FIG. Fig. 3, 4 ) flees. Hereby, a radial position adjustment of the cutting blades 6, 7 are made.

To illustrate the simplified Nachschärf- and Einpaßvorganges are in the Fig. 6 to 9 various versions of cutting blades 6, 7 with drawn, dash-dotted sharpening lines 39, 40 shown. Fig. 6 shows the cutting blade 6 after Fig. 3 according to which the lateral cutting edge 10 extends approximately parallel to the radial direction represented by an arrow 42. Contrary to the radial direction 42, the lateral cutting edge 10 is slightly offset by about 1 ° relative to the parting plane 41 (FIG. Fig. 2 ) inclined inwards. Starting from the corner point 15, the radially outer cutting edge 9 increases linearly with increasing axial course in the radial direction 42, according to which the circle diameter of the cutting edge 9, starting from the corner point 15, increases progressively. Such a cutting geometry is used in particular for the longitudinal cutting of workpieces. The cutting edges 9, 10 enclose an angle α of about 105 °.

Dash-dotted sharpening lines 39 indicate the position and the course of the cutting edge 9 after various sharpening operations. The same applies to sharpening lines 40 indicated by dot-dash lines, which indicates the position and the course of the lateral cutting edge 10 after various sharpening operations. The higher-loaded peripheral, radially outer cutting edge 9 is machined during resharpening more than the lateral cutting edge 10, as shown by the approximately twice the distance between the sharpening lines 39 compared to the distance of the sharpening lines 40 results. The material volume of the cutting blade 6 to be removed during the sharpening operation results from the length of the respective sharpening line 39, which in one direction through the point of intersection with an associated sharpening line 40 and in the Counter direction is limited by the intersection with the additional edge 24 or the additional edge 25. It can be clearly seen that the length of the sharpening lines 39 through the recess 27 with respect to the contour of the quadrangle 21 (FIG. Fig. 3 ) is significantly reduced. The sharpening is done in particular by rotary erosion, whereby the material of the cutting blade 6 is removed as a volume. The work progress when re-sharpening or when fitting individual cutting blade 6 is directly dependent on the volume of the removed blade material. The Erodieraufwand is significantly reduced.

The same applies to the Nachschärf- or Einpaßaufwand in the lateral cutting edge 10, in which the sharpening lines 40 are limited in the radial direction on the one hand by the intersection with the associated sharpening lines 39 and in the opposite direction by the additional edge 22. Here, too, a course of the sharpening lines 40 can be provided further by the additional edge 23. Because of the lower compared to the cutting edge 9 load of the lateral edge 10 only a smaller material removal is provided during re-sharpening, as results from half the distance between the sharpening lines 40 to each other in comparison to the sharpening lines 39.

For the sake of clarity, reference is made here to the illustration Fig. 3 same features provided with the same reference numerals.

Fig. 7 shows the cutting blade 7 after Fig. 4 in which the sharpening lines 39, 40 and the angle α are as shown to Fig. 6 are registered. Only the side cutting edge 10 associated Schärflinien 40 are shortened by the recess 26. In the remaining features and reference numerals, the representation is correct Fig. 7 with the after the Fig. 4 and 6 match.

The 8 and 9 show still alternative embodiments of the cutting blades 6, 7 after the Fig. 4 to 7 in which the angle α between the lateral cutting edge 10 and the peripheral cutting edge 9 is less than 90 ° and in the exemplary embodiment shown is approximately 75 °. This reduces the circle diameter of the cutting edges 8, 9 on the cutting blades 6, 7 starting from the corner point 15. Such cutting geometries are used on Zerspanwerkzeugen for cross-machining of corresponding workpieces.

In the in Fig. 8 shown embodiment of the cutting blade 6, the recesses 26, 27 are each formed by a single, rectilinear additional edge 23, 25. Again, the shortening of the sharpening lines 30, 40 at the intersection with the respective additional edge 23, 25 clearly. The same applies to the in Fig. 9 shown embodiment of the cutting blade 7, which is designed as Zerspanschändmesser and in which the shortening of the sharpening lines 40 in the region of the lateral cutting edge 10 a recess 26 is formed by a single, rectilinearly extending additional edge 23.

The in the 8 and 9 shown cutting knife 6, 7 can as well as in the Fig. 3 to 7 shown cutting blade 6, 7 can also be provided with recesses 26, 27 which are formed by a total of four additional edges 22, 23, 24, 25. Likewise, it may be advantageous in the Fig. 3 to 7 shown cutting blades 6, 7 with recesses 26, 27 to be provided, which are formed only by a respective additional edge 23, 25. It may also be expedient to provide a cutting blade 6, 7 with two differently shaped recesses 26, 27. In the other features and reference numerals, the cutting blade 6 is correct Fig. 8 with the after the Fig. 3 and 6 and the cutting blade 7 after Fig. 9 with the after the Fig. 4 and 7 match.

Claims (10)

1. Cutting tool, in particular for machining materials such as wood, with a supporting body (1) in the form of an approximately circular disc that is driven in rotation about an axis (32), around the circumference of which are arranged a number of cutting teeth (2, 3) that comprise blade carriers (4, 5) with cutting blades (6, 7) formed as separate components fixed thereto, such that in each case part of the cutting blade (6, 7) is formed as a parting and chip-forming cutting blade, and such that at least one structure of the cutting blade (6, 7) comprises a cutting edge (8, 9) on the circumferential side, a lateral edge (10) on one side that projects axially over the supporting body (1) and two mounting edges (11, 12) opposite the respective cutting edges (8, 9, 10), which in a plan view of the front of the cutting blade (6, 7) describe a rectangle (21) with four lines (17, 18, 19, 20) that extend along the cutting edges (8, 9, 10) and mounting edges (11, 12) and meet at four corner points (13, 14, 15, 16),
   characterised in that at least one of the two cutting edges (9, 10) and in particular the lateral cutting edge (10) has in the area of the respective corner point (14, 16) associated with the adjoining mounting edge (11, 12) a notch (26, 27) that cuts away the said corner point (14, 16) and forms there at least one additional edge (22, 23, 24, 25).
2. Cutting tool according to Claim 1,
   characterised in that each of the two cutting edges (9, 10) of the cutting blade (6, 7) is provided with a respective notch (26, 27).
3. Cutting tool according to Claims 1 or 2,
   characterised in that the said notch (26, 27) is located outside a fixing surface (28, 29) of the blade carrier (4, 5) and, in particular, is adjacent to the fixing surface (28, 29).
4. Cutting tool according to any of Claims 1 to 3,
   characterised in that the notch (26, 27) is formed by a single, in particular rectilinear additional edge (23, 25).
5. Cutting tool according to any of Claims 1 to 3,
   characterised in that the notch (26, 27) is formed by two additional edges (22, 23, 24, 25), in particular rectilinear ones, arranged convexly relative to one another.
6. Cutting tool according to any of Claims 1 to 5,
   characterised in that the cutting blade (6) provided with the notch (26, 27) is the parting cutting blade.
7. Cutting tool according to any of Claims 1 to 6,
   characterised in that the cutting blade (7) provided with the notch (26, 27) is the chip-forming cutting blade, which in its axially lateral area is formed as a parting cutting blade.
8. Cutting tool according to any of Claims 1 to 7,
   characterised in that the additional edge (23) located in the area of the lateral cutting edge (10) is aligned with a reference surface (35) of the supporting body (1).
9. Cutting tool according to Claim 8,
   characterised in that the reference surface (35) and the additional edge (23) aligned therewith are at least approximately parallel to a plane (33) of the supporting body (1).
10. Cutting tool according to Claims 8 or 9,
    characterised in that in relation to an intended rotation direction (36) of the cutting tool, the said reference surface (35) is located behind the said additional edge (23) aligned therewith.

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