Cutting tools

Abstract

The present invention provides a cutting tool, particularly a saw blade, having a carrier (1) and a cutting insert (3), wherein the carrier (1) forms at least one cylindrical accommodating portion (2) and at least one stop jaw (8) for the cutting insert (3), the cutting insert (3) has a cylindrical cutting base (4) and a cutting edge (5) protruding radially from the cutting base, the cutting edge having at least one stop (6) for the stop jaw (8) on the back side of the cutting edge, the cutting insert (3) being insertable into the accommodating portion (2) transverse to the cutting direction and rotatable between an insertion position and a cutting position in the inserted state, and the cutting insert (3) being fixed in the cutting position by an anti-rotation device. In order to provide a tool of the type mentioned at the outset which, despite simple manufacturing and mounting requirements, ensures sufficient stability and strength of the replaceable cutting insert in the carrier, thereby enabling reliable application to thin slices, particularly when the carrier thickness is less than 6 mm, it is proposed that the cutting insert (3) is inserted into the cylindrical receiving part (2) in a bayonet-locking manner.

Description

Technical field

[0001] The invention comprises a carrier and a cutting insert, the carrier constituting at least one cylindrical receptacle and at least one stopper jaw for the cutting insert, and the cutting insert having a cylindrical cutting base and a cutting insert. a cutting edge protruding radially from the cutting body, which cutting edge is provided with at least one stop for a stopper jaw on the back side of the cutting edge, and the cutting insert is inserted into the receptacle transversely to the cutting direction; The present invention relates to a cutting tool, in particular a saw blade, which is rotatable in the inserted state between an insertion position and a cutting position, the cutting insert being fixed in the cutting position by an anti-rotation device. [Background technology]

[0002] From US Patent Application Publication No. 20020112590 a circular saw blade with an exchangeable cutting insert is known. For this purpose, the circular saw blade forms a carrier with several cylindrical receptacles and stop jaws, so that the respective cutting insert can be moved transversely to the cutting direction and in particular axially parallel to the carrier. It can be inserted into the main part. Upon insertion into the cylindrical receptacle, the cutting insert is rotated from an insertion position into a cutting position about a pivot axis parallel to the carrier axis. In the cutting position, an alignment spring arranged to extend substantially radially in the stopper jaw engages an alignment groove corresponding to the alignment spring of the inserted cutting insert. A locking screw is provided to secure the cutting insert within the housing to prevent rotation. However, its drawback is that a saw blade thickness of less than 6 mm cannot be easily achieved based on the limitations on the minimum thread diameter set from a construction point of view. In addition, there is the disadvantage that the stability and strength of the cutting insert on the carrier during operation is very low if the thickness of the saw blade is small. For these reasons, such cutting insert systems have hitherto not been able to be used satisfactorily for slicing applications. [Prior art documents] [Patent document]

[0003] [Patent Document 1] US Patent Application Publication No. 20020112590 [Summary of the invention] [Problem to be solved by the invention]

[0004] Therefore, despite the simple manufacturing and installation conditions, it guarantees sufficient stability and strength of the exchangeable cutting insert in the carrier, which makes it suitable for thin-cut applications, especially when the carrier thickness is less than 6 mm. What is needed is a cutting tool of the type mentioned at the outset that reliably allows this. [Means to solve the problem]

[0005] The invention solves the problem posed by the fact that the cutting insert is inserted in a bayonet-locking manner into a cylindrical receptacle.

[0006] Insertion of a cutting insert into a cylindrical receptacle with bayonet locking means that the cutting insert and the cylindrical receptacle are inserted into the cylinder axis in order to create a connection between the cutting insert and the cylindrical receptacle. It should be understood that it is pushed into the insertion position in the direction and rotated in the opposite direction with respect to the cylinder axis into the cutting position. Here, preferably the cylinder axes of both the receiving part and the cutting base substantially coincide. This not only allows a simple installation or removal of the cutting insert, which can be carried out by hand, especially when the cutting tool is already installed, but also ensures that the respective cutting insert is already sufficiently stable in the cutting position. It is thus fixed in a cylindrical receptacle, which makes it possible to dimension the corresponding anti-rotation device, for example a bolt or spring steel element, smaller and, in particular, to dispense with a screw as anti-rotation device. can. However, it is of course also possible in principle for the mounting or dismounting of the cutting insert to be carried out automatically by means of a corresponding mounting machine. In addition, the measures according to the invention provide for a uniform transmission of cutting forces to the carrier via the cylindrical receptacle and at least one stopper jaw during operation and for example by impact or impact in the cutting direction. On the other hand, it is possible both to reduce the risk of detachment of the cutting insert from the receptacle due to the action of forces extending laterally. Overall, the features according to the invention make it possible to reduce breakage of cutting inserts, thereby achieving a prerequisite for providing cutting tools, in particular saw blades, for slicing applications. The tool can therefore be easily, preferably automatically, equipped with replaceable cutting inserts despite a carrier thickness of less than 6 mm. The cutting insert is inserted into the cylindrical receptacle with a bayonet lock, so that a snap-fit ​​fixation of the cutting insert in the cylindrical receptacle transverse to the cutting direction is achieved. Over the circumferential area of ​​the cylindrical receptacle, corresponding locking means of a bayonet lock can be provided, which locking means provide the necessary retention of the cutting insert within the receptacle over a suitable surface. The cutting edge has at least one stop for the stopper jaw on the back side of the cutting edge. Back side of the cutting edge means in particular that the stop is provided on the back side of the cutting edge opposite the rake face from which the cut-out debris flows out. For clarity, it is noted that in this case the blade of the cutting insert is referred to as the cutting edge for simplicity.

[0007] Particularly advantageous structural conditions are obtained if the cutting insert is provided with at least one nose around the cylinder that can be inserted into an undercut groove of the receptacle. In this case, the undercut groove is provided with a first plug-in guide groove extending parallel to the cylinder axis of the cylindrical receptacle on the basis of a bayonet lock, in which the first plug-in guide groove A second rotation guide groove is connected to the first insertion guide groove in the cylinder circumferential direction of the accommodating portion substantially laterally to the first insertion guide groove. Therefore, when inserting the cutting insert into the receiving part, the nose of the cutting insert can first be moved along the insertion guide groove, so that the cutting insert occupies an insertion position in the receiving part. When the cutting insert and the receptacle are rotated in opposite directions with respect to the cylinder axis, the nose can slide along the rotation guide groove, so that the cutting insert finally assumes a cutting position with respect to the receptacle. The nose can, for example, be formed as a type of cam whose surfaces are inclined towards each other and towards the circumference of the cylinder of the cutting insert. Thus, the plug-in guide groove cross-section can substantially correspond to the longitudinal section of the nose, whereas the rotary guide groove cross-section can correspond substantially to the cross-section of the nose, and the nose is movable along the groove with play.

[0008] Conversely, it is also conceivable, analogous to the above-mentioned features, that the inner cylinder periphery of the receptacle is provided with at least one nose that can be inserted into the undercut groove of the cutting insert. It is noted that, for clarity, the inner cylindrical periphery of the receptacle means the surface of the receptacle facing the cylindrical periphery of the cutting insert.

[0009] In order to enable both easy installation conditions and uniform support of the cutting insert during operation, the cutting edge of the cutting insert extends radially from the cylindrical cutting base of the cutting insert inserted into the cylindrical receptacle. It is proposed that the protruding cutting edge is provided on the back side of the cutting edge with two stop surfaces, preferably arranged inclined to each other at an obtuse angle, for centering the cutting insert in the stop jaw. In this case, the two surfaces arranged obliquely relative to each other are preferably also obliquely relative to the two cylinder base surfaces of the cutting body. These features make it possible to ensure the centering of the cutting insert in the receptacle despite the simple manufacturing and installation conditions, thereby ensuring uniform alignment of the tool according to the invention to all cutting inserts. It is possible to apply a large amount of stress.

[0010] In order to further reduce the breakage of the cutting insert, the cutting insert is provided with two stops distributed over its cylinder circumference for centering the cutting insert in two stopper jaws, which stops It is recommended that they be opposed to each other with respect to the cylinder axis. This allows a compact seating of the cutting insert in the receptacle, so that a particularly advantageous introduction of cutting forces or a particularly uniform transmission of cutting forces to the carrier is possible. In this case, it is of course possible for the stop or at least one of the corresponding stop jaws to be provided with stop surfaces arranged interlockingly as described above.

[0011] Preferably, the carrier comprises a cavity for an anti-rotation device facing the stop jaw, connected around the cylinder inside the receptacle. This not only provides simple production conditions, but also allows for a corresponding anti-rotation device, based on easy access to the cavity, although the strength of the tool is sufficient for slicing applications. It can be inserted into a cavity or replaced without difficulty. Preferably, the direction of insertion of the anti-rotation device into the cavity also extends parallel to the cylinder axis or the carrier rotation axis.

[0012] In this connection, it is particularly advantageous if the anti-rotation device is constituted by a tensioning spring which is supported on the two sides of the cavity on the one hand and rests on the cylindrical cutting base on the other hand. . For reliable tensioning conditions of operation, the corresponding support and abutment directions preferably extend at right angles to each other.

[0013] Additional stability when simple mounting conditions are obtained at the same time is obtained if a locking catch is arranged around the cylinder of the cutting insert to prevent rotation in the cutting position. Thereby, the tensioning of the tensioning spring for preventing rotation can be easily carried out simply by rotating the cutting insert and the accommodating part to the cutting position.

[0014] Furthermore, the tensioning spring is inserted into the guide receptacle at the side of the cavity in order to secure the tensioning spring itself in such a way that it cannot be released from the cavity during operation, in particular due to external blow or shock effects. It is suggested that Particularly preferably, the guide receptacle forms a stop for the tensioning spring part inserted into the guide receptacle in the insertion direction of the tensioning spring or opposite to the insertion direction.

[0015] The present invention provides a cutting tool having a cylindrical cutting base and a cutting edge projecting radially from the cutting base, the cutting edge being provided with at least one stopper for a stopper jaw on the back side of the cutting edge. It also relates to cutting inserts. At least one nose and / or at least one groove is arranged around the cylinder of the cutting insert, the at least one nose and / or at least one groove ensuring that the cutting insert can be mounted in a bayonet locking manner on a tool, in particular on a circular saw blade. It is formed so that it can be inserted into the housing. Further embodiments are described in the claims.

[0016] Despite the simple manufacturing conditions, the lock catch extends over the peripheral part of the cutting body in order to offer particularly advantageous installation conditions on the one hand and to enable stable seating of the cutting insert in the tool receptacle on the other hand. It is proposed to construct a semi-kidney-shaped catch guide groove with a lower receiving arc and a higher tensioning arc. The low receiving arc of the catch guide groove allows a problem-free insertion of the cutting insert into the tool receptacle, and should the anti-rotation parts, e.g. Engages the containing arc by contact. When the cutting insert or carrier is rotated into the cutting position, the anti-rotation part slides against the semi-kidney-shaped catch guide groove up to the upper tensioning arc, where it is held in a frictionally engaged manner and is therefore fixed. .

[0017] The subject matter is illustrated by way of example in the drawing. [Brief explanation of drawings]

[0018]

Figure 1

Figure 2

[0019] The cutting tool according to the invention is designed as a circular saw blade, the carrier 1 of which has a plurality of cylindrical receptacles 2 arranged on its periphery, in which a cutting tool according to the invention is inserted. Insert 3 is inserted. The cutting inserts 3 each include one cylindrical cutting base 4 and one cutting edge 5 protruding radially from the cutting base. Furthermore, the cutting insert 3 has two stops 6,7 distributed over its circumference for centering the cutting insert 3 in two stop jaws 8,9, these stops 6,7 having a cylindrical shape. They face each other with respect to the cylinder axis of the cutting base 4.

[0020] The cutting insert 3 can be inserted into the housing part 2 transversely to the cutting direction, and in the inserted state can be rotated between an insertion position and a cutting position, as exemplary shown in FIG. . The cutting insert 3 is fixed in the cutting position shown on the left in FIG. 2 by an anti-rotation device, which in this example is formed as a tensioning spring 10. The tensioning spring 10 is inserted into the cavity 11 of the carrier 1, supported by two side surfaces 12 of the cavity 11, and is in contact with the cylindrical cutting base 4.

[0021] Furthermore, a lock catch for the tensioning spring 10 in the cutting position is arranged around the cylinder of the cutting insert 3. In this case, the locking catch constitutes a semi-kidney-shaped catch guide groove 13 with a lower receiving arc 14 and an upper tensioning arc 15 extending over the peripheral part of the cutting base 4. In the inserted position shown on the right side of FIG. 2, the tensioning spring 10 engages with its abutment part 16 with play in the lower receiving arc. When the cutting insert 3 or the carrier 1 is rotated into the cutting position shown on the left side of FIG. There it is frictionally retained and thus fixed.

[0022] 3 and 4, it can be seen that according to this embodiment, a nose 18 that can be inserted into the undercut groove 17 of the housing portion 2 is provided around the cylinder of the cutting insert 3. In this case, the undercut groove 17 is provided with a first plug-in guide groove 19 extending parallel to the cylinder axis of the receiving part 2 based on the bayonet lock, into which the first plug-in guide groove 19 extends parallel to the cylinder axis of the receiving part 2. A second rotation guide groove 20 is connected laterally to the first insertion guide groove in the circumferential direction of the cylinder of the accommodating portion 2. Therefore, when inserting the cutting insert 3 into the housing part 2, first the nose 18 can move along the insertion guide groove 19, so that the cutting insert 3 occupies an insertion position within the housing part 2. When the cutting insert 3 and the receptacle 2 are rotated in opposite directions with respect to the cylinder axis, the nose 18 can slide along the rotation guide groove 20, so that the cutting insert 3 changes its cutting position with respect to the receptacle 2. occupy As can be seen in FIG. 4, the noses 18 are formed, for example, as a type of cam whose surfaces are inclined with respect to each other and with respect to the circumference of the cylinder of the cutting insert 3. The plug-in guide groove cross section 19 thus substantially corresponds to the longitudinal section of the nose 18, which is exemplary cam-shaped, whereas the rotary guide groove cross section 20 corresponds to the cross section of the nose 18. Substantially coincident, the nose 18 is movable along the grooves 19, 20 with play.

[0023] As can also be seen in FIGS. 3 and 4, the stop 6 on the back side of the cutting edge has two stop surfaces 21 arranged obliquely to each other for centering the cutting insert 2 in the stop jaw 8, so that: The stop jaw also has two inclined stop surfaces 22. The stopper 7 facing the stopper 6 with respect to the cylinder axis of the cutting base 4 and the corresponding stopper jaw 9 are also each provided with a stopper surface 23 or 24 arranged obliquely relative to each other.

[0024] Furthermore, it can be seen in FIGS. 3 and 4 that the tensioning spring 10 is inserted into the guide receptacle 25 at the side 12 of the cavity 11.

[0025] The cutting inserts 3 can in each case be simply inserted into the cylindrical receptacle 2 in the cutting tool and then manually inserted or removed again using a corresponding insertion tool. In FIG. 2, a driver profile 26 for an exemplary insertion tool is schematically shown.

Claims

1. A cutting tool, in particular a saw blade, comprising a carrier (1) and a cutting insert (3), the carrier (1) constituting at least one cylindrical receiving part (2) and at least one stop jaw (8) for the cutting insert (3), the cutting insert (3) having a cylindrical cutting base (4) and a cutting edge (5) protruding radially from the cutting base, the cutting edge having at least one stop (6) for the stop jaw (8) on the back side of the cutting edge, the cutting insert (3) being insertable into the receiving part (2) transversely to the cutting direction and rotatable in the inserted state between an insertion position and a cutting position, the cutting insert (3) being fixed in the cutting position by an anti-rotation device, A cutting tool, characterized in that a cutting insert (3) is inserted into a cylindrical receiving part (2) in a bayonet-lock manner.

2. 2. A cutting tool according to claim 1, characterized in that the cutting insert (3) is provided on its cylindrical periphery with at least one nose (18) which can be inserted into the undercut groove (17) of the receiving part (2).

3. 2. A cutting tool according to claim 1, characterized in that the inner cylindrical periphery of the receiving part (2) is provided with at least one nose which can be inserted into an undercut groove of the cutting insert (3).

4. 4. The cutting tool according to claim 1, wherein the cutting edge (5) has, on the back side of the cutting edge, two stop surfaces (21) arranged at an angle to each other for aligning the cutting insert (3) in the stop jaw (8).

5. 5. A cutting tool according to claim 4, characterized in that the cutting insert (3) comprises two stops (6, 7) distributed over its cylindrical circumference for aligning the cutting insert (3) in two stop jaws (8, 9), said stops (6, 7) being opposite each other with respect to the cylinder axis of the cylindrical cutting body (4).

6. 6. Cutting tool according to any one of claims 1 to 5, characterized in that the carrier (1) comprises a cavity (11) for an anti-rotation device opposite the stopper jaw (8), which is connected to the cylindrical periphery inside the receiving part (2).

7. 7. Cutting tool according to claim 6, characterized in that the anti-rotation device is constituted by a tensioning spring (10) which is supported on the two side surfaces (12) of the cavity (11) on the one hand and rests on the cylindrical cutting base (4) on the other hand.

8. 8. Cutting tool according to claim 6 or 7, characterized in that the cutting insert (3) has a locking catch arranged around the cylinder to prevent rotation in the cutting position.

9. 9. Cutting tool according to claim 7 or 8, characterized in that the tensioning spring (10) is inserted into a guide receptacle (25) at the side (12) of the cavity (11).

10. A cutting insert (3) for a cutting tool, comprising a cylindrical cutting body (4) and a cutting edge (5) protruding radially from the cutting body, the cutting edge having at least one stopper (6) for a stopper jaw (8) on the back side of the cutting edge, A cutting insert (3), characterized in that at least one nose (18) and / or at least one groove (17) are arranged around a cylinder of the cutting insert (3), and the at least one nose (18) and / or at least one groove (17) are formed so that the cutting insert (3) can be inserted into a receiving part (2) of a tool in a bayonet lock manner.

11. 11. The cutting insert according to claim 10, wherein the cutting edge (5) is provided on the back side thereof with two stop surfaces (21) arranged at an angle to one another for aligning the cutting insert (3) in the cylindrical receiving part (2) of the tool.

12. 12. A cutting insert according to claim 10 or 11, characterized in that the cutting insert (3) comprises two stops (6, 7) distributed over the cylindrical circumference of the cutting body (4) for aligning the cutting insert (3) in the cylindrical receiving part (2) of the tool, the stops (6, 7) being opposite each other with respect to the cylindrical axis of the cutting body (4).

13. The cutting insert according to any one of claims 10 to 12, characterized in that a locking catch is arranged around the cylinder of the cutting body (4) to prevent rotation in the cutting position.

14. 14. Cutting insert according to claim 13, characterized in that the locking catch constitutes a semi-kidney-shaped catch guide groove (13) extending over a peripheral portion of the cutting body (4) and having a lower accommodation arc (14) and an upper tensioning arc (15).

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