WO2018050271A2

WO2018050271A2 - Tool cutting body, tool and method for the production thereof

Info

Publication number: WO2018050271A2
Application number: PCT/EP2017/001054
Authority: WO
Inventors: Michael Magin; Sven RASSBACH
Original assignee: Ceratizit Luxembourg S.A.R.L.
Priority date: 2016-09-19
Filing date: 2017-09-06
Publication date: 2018-03-22
Also published as: WO2018050271A3; AT15546U1

Abstract

The invention relates to a tool cutting body (10) for soldering to a tool base body (1) made of steel. The tool cutting body (10) has a working region (20) made of a silicon-containing ceramic and a connecting region (30) made of a WC based hard metal, a Mo base material or a W base material. The working region (20) and the connecting region (30) are bonded together at at least two surface regions (21a, 21b) of the ceramic, which are not parallel to one another. The connecting region (30) has at least one joining surface (19) for integrally bonding by soldering with a tool base body (1).

Description

TOOL CUTTING BODY, TOOL AND METHOD

THEIR PRODUCTION

The present invention relates to a tool cutting body, a

Tool with such a tool-cutting body, a use of such a tool-cutting body and a method for producing a tool.

In cutting machining with, in particular, rotating tools, it is known to use, as cutting edges which engage with the material to be machined, tool cutting bodies made of a hard, resistant material, which are arranged on a tool base made of a much tougher material, in particular of steel , Besides tool cutting bodies, which are mechanically driven by e.g. Screw or through

When clamping is fastened to the tool body, in particular also implementations have become established in which the tool cutting body is firmly bonded by e.g. Soldering or welding is attached to the tool body. In such applications, tool bits are often made of e.g. Carbide or cermet are used, which are fixed by soldering to a tool base made of steel. Cemented carbides and cermets are composite materials which consist of hard material particles embedded in a ductile metallic matrix, wherein the proportion of hard material particles in weight percent clearly exceeds the proportion of the metallic matrix. The metallic binder may in particular be formed by at least one of Co, Ni and Fe or by a base alloy of at least one of these metals, in particular by Co, Ni or a base alloy of Co and / or Ni. Under a base alloy of a metal is an alloy to understand in which this metal forms the largest proportion in weight percent. In addition to the metals mentioned, in particular also other alloying elements can be dissolved in smaller amounts in the binder. In the case of a WC-based hard metal, the hard material particles are at least predominantly formed by tungsten carbide (WC), wherein in smaller amounts, other hard material particles, in particular

CONFIRMATION COPY Carbides of elements of Groups IV to VI of the Periodic Table of the

Elements that can be included.

For some time now, efforts have been increasingly made to form the cutting areas of tools, in particular circular or band saws, milling cutters or drills, from ceramic materials, in order to achieve improved machining or longer tool life in the machining of some materials. Silicon-containing ceramics, such as in particular silicon nitride (S13N4) and SiAlON (a group of ceramics consisting of the elements silicon, aluminum, oxygen and nitrogen) or silicon carbide (SiC), are particularly promising for the cutting process, due to their high hardness and the concomitant low toughness and the extremely low thermal expansion coefficient but to particularly great difficulties in connection with a tool body, in particular when a cohesive connection with the

Tool body is sought.

It is an object of the present invention to provide an improved tool cutting body, an improved tool, and a method of making such an improved tool.

The object is achieved by a tool cutting body for soldering with a tool body made of steel according to claim 1. Advantageous developments are specified in the dependent claims.

The tool-cutting body has a working area of a

silicon-containing ceramic and a connection area of a WC-based hard metal, a Mo base material or a W-base material. The working area and the connection area are connected in a material-locking manner to at least two non-parallel surface areas of the ceramic. The connection area has at least one

Joining surface for cohesive joining by soldering with a

Tool body on. Due to the cohesive connection of the ceramic to the at least two surface areas is a reliable Supported the working area at the connection area achieved. The cohesive connection between the silicon-containing ceramic and the connection area of WC-based hard metal, Mo base material

(Molybdenum-based material) or W-base material (tungsten-based material) may be e.g. via an active solder or via a metallization of the

silicon-containing ceramic and subsequent use of a conventional solder e.g. at relatively high temperatures, e.g. in one

Temperature range between 750 ° C and 1050 ° C, which is not critical for the material of the connection area, but would be problematic for a steel tool body. In this way, a reliable

cohesive connection to the silicon-containing ceramic are formed, which would not be possible at lower temperatures. Under Mo base material or W-base material is to be understood a material whose

Main component in weight percent molybdenum or tungsten is. The at least two mutually non-parallel surface areas of the ceramic, to which the working area and the connection area are connected, may be e.g. also parts of a uniform curved

Be surface.

The realization of the connection area of WC-based hard metal, Mo base material or W-base material allows on the one hand a relatively small difference in the thermal expansion coefficient between the silicon-containing ceramic and the connection region and on the other hand, a cohesive connection between the

Connection area and a tool body made of steel by soldering at relatively low, uncritical for the steel temperatures, so that a total of a very reliable cohesive connection of the silicon-containing ceramic to the tool body can be realized. Furthermore, overall, the resulting stresses in the composite can be advantageously distributed. Preferably, the connection region may also have at least two mutually non-parallel joining surfaces for cohesive bonding by soldering to the tool body. Preferably, the tool-cutting body can be constructed such that all

Contact surfaces to the tool body through the material of Connection area are formed. In this way, in the formation of a cohesive connection by soldering to the tool body in the use of conventional soldering machines reliable heating and safe wetting of the joining surfaces possible.

According to a development, the difference in the thermal

Expansion coefficient between the ceramic and the connection area less than 2 ^* 10 ⁶ K ¹ . In this case, the surface areas of the ceramic serving for the cohesive connection can act

Voltages are kept low. A larger difference in the thermal expansion coefficient at the joints between the

Connection area and the tool body made of steel, however, is due to the material pairing formed there as much less critical. The difference in the thermal expansion coefficient can therefore be advantageous to the relatively unproblematic compared

Interface between the material of the connection area and the steel of the tool body are moved.

According to a further development of the silicon-containing ceramic has a thermal expansion coefficient α of less than 4 * 10 ^"6 K ^_1. In this case, the advantages described particularly clearly show. Preferably, the thermal expansion coefficient may be less than 3.7 * 10 ^-8 K ¹ to be . Of the

coefficient of thermal expansion is preferably at least 2.8 ^* 10 ^"6 K \ so that the difference to the connection area is not too large.

According to a further development, the connecting region has a thermal expansion coefficient α in the range of 4 * 10 ^"6 ^{K" 1} to 6 ^* 10 ^-6 K ^"-1. In this case, the difference in thermal expansion coefficient between the silicon containing ceramic and the connection area is so small in that a reliable and stable cohesive connection is achieved, Preferably, the connection region has a thermal connection

Expansion coefficients in the range of 4.5 * 10 " ⁶ K ^* to 5.5 ^* 10 ^{" 6} K ^"1 . According to a development, the working area has a rake surface and a main rake surface and the two non-parallel ones

Surface areas are arranged on a side facing away from the main relief surface side and on a side facing away from the rake face of the work area. In this case, a particularly reliable and durable support of the working area is provided from the silicon-containing ceramic.

According to a further development, the working area and the connection area are connected to one another via a solder having a liquidus temperature in the range from 750 ° C. to 1050 ° C., preferably 800 ° C. to 1000 ° C. In this case can reliably a stable cohesive connection between the

Work area and the connection area.

According to a development, the silicon-containing ceramic is S13N4 or a

SiAlON. With these materials, a particularly advantageous ratio of manufacturing costs and machining properties can be achieved. Preferably, the silicon-containing ceramic may be a non-oxide ceramic.

According to a development, the connection area is formed of WC-based hard metal. In this case, the thermal

Expansion coefficient e.g. In a simple manner, the selected content of the metallic binder can be approximated to that of the silicon-containing ceramic. According to a development of the tool-cutting body is a

Cutting element for a cutter or drill or a sawtooth for a circular or band saw. Especially in such applications, the show

Benefits particularly clear. The object is also achieved by a tool according to claim 11.

Advantageous developments are specified in the dependent claims.

The tool has a steel tool body and at least one of the previously described tool bits. The joint surface of the Connection area is materially connected to the tool body. For example, the joining surface of the connection region can preferably be connected by soldering to the tool base body. In particular, moreover, for example, more than one joining surface can be provided. It is provided a tool in which a working area of a silicon-containing ceramic reliably total cohesively with a

Tool body is connected and in which occurring at joints problematic stress concentrations can be reliably avoided.

According to a development, the at least one joining surface is connected to the tool base body by means of a solder having a melting temperature 720 720 ° C. In this case, damage to the tool body made of steel due to excessive temperatures in the cohesive joining can be reliably prevented and it is simultaneously the

cohesive connection between the work area and the

Connection area not adversely affected.

According to a development, the difference is in the thermal

Expansion coefficient between the tool body and the connection region is more than twice as large as the difference in the coefficient of thermal expansion between the connection region and the silicon-containing ceramic. Preferably, the difference in the thermal expansion coefficient between the tool body and the connection region more than three times as large as the difference in

coefficient of thermal expansion between the connection region and the silicon-containing ceramic. In this case, be problematic

Stress in the range of significantly more critical cohesive connection between the silicon-containing ceramic and the connection area reliably avoided.

The object is also achieved by a use of a tool cutting body described above for materially connecting the Connection area solved by soldering with a steel tool body.

The object is further achieved by a method according to claim 15 for producing a tool in which a tool cutting body described above by soldering at a temperature .s 720 ° C with a

Tool body made of steel is connected.

Further advantages and advantages of the invention will become apparent from the following description of exemplary embodiments with reference to the accompanying figures.

From the figures show.

Fig. 1: a schematic representation of a tool with a

A plurality of tool cutting bodies according to a first

embodiment;

2 shows an enlarged detail of a in Fig. 1 with II

marked area of the tool;

3 is a perspective view of a tool cutting body in the first embodiment;

4 shows an illustration in side view of the tool cutting body from FIG. 3;

5 is a perspective view of a first modification of the

Tool cutting body;

6 is a perspective view of a second modification of the

Tool cutting body;

7 is a perspective view of a third modification of the invention

Tool cutting body;

8 is a perspective view of a fourth modification of the invention

Tool cutting body;

9 is a perspective view of a fifth modification of FIG

Tool cutting body;

10 is a perspective view of a sixth modification of the

Tool cutting body; Fig. 11 a): a representation in plan view of a tool cutting body according to a seventh modification;

11 b) is another view of the tool cutting body according to the seventh modification;

FIG. 12 is a schematic perspective illustration of a tool with a plurality of tool cutting bodies according to a second embodiment; FIG.

13 is another perspective view of the tool according to the second embodiment;

FIG. 14 is a perspective view of a tool cutting body in the second embodiment; FIG.

FIG. 15 is a perspective view of a first modification of FIG

Tool cutting body in the second embodiment; FIG. 16 is a perspective view of a second modification of FIG

Tool cutting body in the second embodiment; and FIG. 17 is a perspective view of a third modification of the invention

Tool cutting body in the second embodiment.

FIRST EMBODIMENT

A first embodiment will be described in more detail below with reference to FIGS. 1 to 4. The tool 100 according to the first embodiment has a tool base body 1 made of steel, on which a plurality of tool cutting bodies 10 is arranged.

In the concrete example shown, the tool body 1 is a saw blade for a circular saw. According to a modification, the

Tool body 1 but e.g. also be formed by a saw blade for a band saw or the like. The tool cutting bodies 10 are formed in the first embodiment as sawteeth, the more detailed features are described in more detail. A rotational direction R of

Tool body 1 is shown schematically in Fig. 1 by an arrow. As can be seen in particular in the enlarged detail in Fig. 2, the tool body 1 made of steel on its outer periphery on a plurality of chip spaces forming recesses 2, which are each formed with respect to the rotational direction R in front of seats 3, where the

Tool cutting body 10 are materially connected to the tool body 1. The tool-cutting body 10 are arranged in a conventional manner such that serving as a chip surface 11 span of the respective recess 2 is arranged facing. At a transition from the chip surface 11 to the outer periphery facing main free surface 12, a main cutting edge 13 is formed.

The respective tool-cutting body 10 is on its side facing away from the chip surface 11 back 14 and on its of the main surface 12th

facing away from the inside 15 cohesively with the respective, on the

Tool body 1 made of steel formed seat. Of the

Tool cutting body 10 is doing with a solder with a

Melting temperature of £ 720 ° C cohesively connected to the tool body 1 made of steel, to adversely affect the

Material properties of the tool body 1 during soldering

reliably avoid.

The configuration of the tool-cutting body 10 will now be described in more detail with reference to FIGS. 3 and 4.

As can be seen in FIGS. 3 and 4, the tool cutting body 10 has a working area 20 and a connection area 30, which consists of

consist of different materials. The working area 20 forms the area of the tool-cutting body 10, which during machining

mainly comes into contact with the material of the workpiece to be machined. The connection region 30 forms the region of the tool-cutting body 10, via which the tool-cutting body 10 is materially connected to the tool base body 1 made of steel. The of the

Main free surface 12 facing away from inner side 15 and facing away from the rake face 11 back 14, the respective joining surfaces 19 for cohesive Bonding by soldering to the tool main body 1 are thus formed on the connecting portion 30. The main cutting edge 13 and the adjoining areas of the cutting face 11 and the main relief face 12 are formed on the working area 20, as well as areas of the side edges 16 of the tool cutting body 10 near the main cutting edge 13.

The working area 20 of the tool-cutting body 10 is made of a

silicon-containing ceramic with a very low thermal

Expansion coefficient α is formed, which is smaller than 4 * 10 ^"6 K ^1. Preferably, the thermal expansion coefficient α is less than 3.7 * 10 ^{" 6} K. The silicon-containing ceramic is preferably formed in the embodiment, for example by S13N4 or a SiAlON. It can be formed in particular by a non-oxidic ceramic such as S13N4. The attachment region 30 is formed of a material that has a

has thermal expansion coefficient α, which is indeed greater than the thermal expansion coefficient α of the silicon-containing ceramic, but differs by less than 2 * 10 ^-6 K ' ¹ from the thermal expansion coefficient α of the silicon-containing ceramic. The connecting region 30 has a coefficient of thermal expansion in the range of 4 ^* 10 ^-6 K ^-1 to 6 * 10 ^"6 K ^'1. Preferably, the thermal expansion coefficient of the attachment region 30 may be in the range of 4.5 * 10 ^-6 K ^-1 to 5.5 ^* 10 * K ^{* 1} . The connection region 30 is formed in the embodiment of a WC-based cemented carbide, a molybdenum-based material or a tungsten-based material. The use of these materials has the advantage that, on the one hand, good solderability at relatively low temperatures to the tool base body 1 made of steel and, on the other hand, a small difference in the thermal expansion coefficient to the silicon-containing ceramic of the working area 20 is made possible. Especially with a

Realization of the connection region 30 of a WC-based hard metal, the thermal expansion coefficient can be adjusted in a targeted manner over the amount of metallic binder in a simple manner. The work area 20 is integrally connected to the connection region 30, so that the tool cutting body 10 is formed as a whole joined cohesively. In the embodiment, the working region 20 and the connection region 30 are preferably connected to one another in a material-locking manner over their entire contact surface. As can be seen in Figs. 3 and 4, the contact surface over which the working area 20 and the

Connection region 30 are materially connected to each other, at least two mutually non-parallel surface regions 21a and 21b. In the embodiment, the contact surface between the working region 20 and the attachment region 30 extends in an overall curved manner, so that the non-parallel surface regions 21a and 21b are parts of an overall coherent, curved contact surface. A first surface region 21a of the two non-parallel surface regions is located on a side of the working region 20 facing away from the main relief surface 12. A second surface region 21b of the two non-parallel surface regions is arranged on one side of the working region 20, which faces away from the rake face 11. In this way it is achieved that the working area 20 at least two sides of the

Connection area 30 is surrounded, so that a good support of the

Working area 20 is given to the connection region 30 both opposite to the clamping surface 11 forces acting as well as against substantially acting in a direction perpendicular to the main surface 12 forces. Furthermore, in this way, in the tool 100 between the working area 20 of the silicon-containing ceramic and the

Tool body 1 made of steel everywhere the connection area 30, so no direct contact area between the working area 20 and the

Tool body 1 is given.

The working area 20 and the connection area 30 are above a solder with a liquidus temperature in the range of 750 ° C to 1050 ° C, preferably in one

Range of 800 ° C to 1000 ° C interconnected. In this case, for example, the working area 20 can be connected to the connection area 30 via an active solder, in order to achieve a reliable cohesive connection of the silicon-containing area To reach ceramics. Alternatively, the silicon-containing ceramic of the working area 20 may also be in a first step in the area of

Contact surface to the connection region 30 are metallized and

then connected by means of a conventional solder with the connection area 30.

The ceramic of the working area 20 and the material of the connection area 30 hold such high temperatures, which for the steel of the

Tool body 1 would be detrimental, without problems and it can also be a reliable solder joint to the basically difficult solderable silicon-containing ceramic of the working area 20 are formed. The

Connection of a solder with such a high liquidus temperature also has the advantage that the tool-cutting body 10, in which the working area 20 and the connection region 30 are materially connected to each other in a simple manner with conventional soldering machines at a temperature below 720 ° C means eg an Ag-Cu-based solder can be materially connected to the tool body 1 made of steel without the properties of the material of the tool body 1 disadvantageous

would be influenced or the cohesive connection between the

Work area 20 and the connection area 30 would be compromised. Further, in this way, the production of the tool-cutting body 10 can be made in time and space separate from the cohesive joining to the tool body 1 made of steel, so that e.g. one

standardized tool-cutting body 10 can be used in combination with a plurality of different tool body 1.

The coefficient of thermal expansion of the connection region 30 can preferably be selected or set such that the difference in the coefficient of thermal expansion <x between the tool body 1 and the connection region 30 is more than twice as large

Difference in the thermal expansion coefficient α between the

Junction 30 and the silicon-containing ceramic of the work area 20. In this way it is ensured that the difference in thermal

Expansion coefficients between the work area 20 and the Connection area 30 is low. This is particularly advantageous with regard to the rather critical cohesive joint between the working area 20 of the silicon-containing ceramic and the connection area 30

cohesive joining parts between the connection region 30 and the tool base body 1 made of steel, on the other hand, are considerably less problematic due to the good solderability of the material of the connection region 30, so that a higher difference in the coefficient of thermal expansion is acceptable there as well, in particular the relatively large thermal expansion coefficient of conventional tool steel used in the Range from about 12 * 10 ^-6 K ¹ to 14 * 10 ^"6 K ^{" 1} . Particularly in the case of WC-based hard metal as the material for the connection region 30 are characterized by the relatively high

Modulus of elasticity of the hard metal on the silicon-containing ceramic of the

Working area 20 acting composite voltage advantageously limited. As can be seen in particular in Figs. 2, Fig. 3 and Fig. 4, the

Tool cutting body 10 in the region of the rake face 11 a Spanieitstufe 18, which is formed as a recess in the material of the working area 20. Although the Spanieitstufe 8 in the specific embodiment shown has the form of such an elongated recess, other shapes are possible. In particular, the Spanieitstufe 18 may also have a more complex three-dimensional design. However, the realization of the chip stage 18 shown in FIGS. 2 to 4 as a recess in the ceramic extending parallel to the main cutting edge 13 from one side flank 16 to the other side flank 16 has the advantage of being particularly easy to produce. The Spanieitstufe 18 allows a particularly advantageous chip forming and chip removal during use of the tool 100th

In the following, some modifications of the tool cutting body 10 will be described, wherein to avoid repetition, only the differences from the previously described tool cutting body 10 are described according to the first embodiment and the same reference numerals are used to designate. FIRST CONVERSION

A first modification of the tool cutting body 10 according to the first embodiment is shown in FIG. The apparent in Fig. 5 tool cutting body 10 according to the first

Modification differs from the previously described tool cutting body 10 according to FIG. 3 and FIG. 4 only in that in

Span surface 11 no additional Spanleitstufe 18 is formed. This

allows a particularly cost-effective production.

SECOND CONVERSION

The second modification shown in FIG. 6 differs from the first modification shown in FIG. 5 only in the embodiment of FIG

Contact area between the work area 20 and the attachment area 30. Unlike the first embodiment and the first modification thereof, the non-parallel surface areas 21a and 21b are not considered to be parts of an overall contiguous, curved one

Contact surface formed, but as at an obtuse angle

mutually extending separate surfaces. Again, however, a first surface area 21a is located on a side of the working area 20 remote from the main relief surface 12, and a second surface area 21b of the two non-parallel surface areas is on one side

Work area 20 is arranged, which faces away from the rake face 11. Also, in the second modification, the rake face 11 may further with a

Spanleitstufe be 18, as described in relation to the first embodiment.

THIRD IMPROVEMENT

The third modification shown in FIG. 7 differs from the second modification described above only in that the first

Surface area 21a and the second surface area 21b of the

Contact surface forming non-paraHelen to each other surface areas at an acute inner angle to each other, whereby a certain additional mechanical jamming of the working area 20 with respect to the connection area 30 is achieved.

In the case of the third modification, again, a chip breaker 18 can be formed in the rake face 11.

FOURTH DIFFERENCE

The fourth modification shown in FIG. 8 differs from the second modification described above, which is illustrated in FIG. 6, only in that a chip-guiding step 18 formed as a recess bounded on all sides is formed in the rake face 11. This chip breaker 18 may be e.g. also be provided with other three-dimensional structures, especially in the depression. Although in the fourth modification, an embodiment of the non-parallel surface portions 21a and 21b serving as a contact surface is shown as in the second modification, configurations of the contact surface corresponding to those in FIGS. 5 and 7 are again possible. FIFTH DIFFERENCE

The fifth modification shown in FIG. 9 differs from the second modification shown in FIG. 6 only in the embodiment of FIG

Spanflächenseitigen area of the connection region 30. In particular, the connection region 30 is so with increasing distance from the

Main cutting edge 13 is formed tapered, that a concave profile of the surface of the connection region 30 is formed on the chip surface side. This embodiment enables a reduction of the material of

Connection region 30. Also in the fifth modification, a chip-conducting step 18 can additionally be formed in the material of the working region 20. Although, in the fifth modification, a configuration of the non-parallel surface portions 21a and 21b serving as a contact surface is the same as that of the second embodiment Variation is again shown in Fig. 5 and Fig. 7 corresponding embodiments of the contact surface are possible.

SIXTH ADAPTATION

A sixth modification of the tool-cutting body 10 is shown schematically in FIG. The tool cutting body 10 according to the sixth modification differs only in the embodiment of

Contact surface, over which the working area 20 and the connection region 30 are integrally connected to each other, from the first modification shown in Fig. 5. The contact surface in the sixth modification is formed as a generally curved surface, e.g. can also have a constant radius. In this sixth modification as well, the surface regions 21a and 21b which are not parallel to one another are thus parts of an overall coherent, curved contact surface.

SEVENTH VARIETY

A seventh modification of the first embodiment is shown schematically in Figs. 11a) and 1b). In the seventh modification, the

Tool cutting body 10 in turn in the region of the rake face 11, a chip breaker 18, which is formed as a recess. In contrast to the first embodiment and the fourth modification shown in FIG. 8, however, the recess of the chip breaker 18 is not only in the material of

Workspace 20 is formed, but extends further into the material of the connection region 30, so that the tool-cutting body 10th

is formed in the form of a groove.

The contact surface, via which the working region 20 and the connection region 30 are integrally connected to one another, can be formed by the shape, for example, as in the first embodiment or one of its modifications. SECOND EMBODIMENT

A second embodiment of a tool 200 with a tool cutting body 210 will be described below with reference to FIGS. 12 to 14. In order to avoid repetition, the description of the second embodiment is based on the above description of the first embodiment, and the same reference numerals are used for corresponding components. Also, the tool 200 according to the second embodiment has a

Tool base 201 made of steel, on which a plurality of tool cutting bodies 210 is arranged.

In the concrete example shown, the tool body 201 is a cutter carrier of a wood cutter. According to a modification, the

Tool body 201 but e.g. also be formed by a cutter support for a drill or for a cutter for another material or the like and the tool-cutting body 210 may be formed accordingly. In the case of the second embodiment shown in FIGS. 12 to 14, the tool cutting bodies 210 are embodied as corresponding milling cutters whose more detailed features are described in more detail below.

As can be seen in FIGS. 12 and 13, the steel tool body 201 has a plurality of flutes on its outer periphery

forming recesses 202, which are each formed with respect to the rotational direction R in front of seats 203, where the tool-cutting body 210 are materially connected to the tool body 201. The tool cutting body 210 are arranged in a conventional manner such that the rake face 11 of the respective recess 202

is arranged facing. At a transition from the rake surface 11 to a main surface 12 facing the outer periphery, a main cutting edge 13 is formed. As in the case of the first embodiment described above, the respective tool cutting body 210 is on its rear side 14 facing away from the chip surface 11 and on its main surface 12

facing away from the inside 15 cohesively with the respective, on the

Tool body 201 made of steel formed seat. The tool-cutting body 10 is in turn with a solder with a

Melting temperature of 720 ° C cohesively connected to the tool body 201 made of steel, to adversely affect the

To avoid material properties of the tool body 201 in the soldering reliable.

Although the tool cutting body 210 has a slightly different shape than the above-described tool cutter 10 according to the first embodiment in the second embodiment, on the other hand, it also has a working region 20 made of a silicon-containing ceramic and a bonding region 30 of one WC-based hard metal, a Mo base material or a W base material, which are materially connected to one another at at least two non-parallel surface regions 21a, 21b. Since the materials of the work area 20 and the bonding area 30 correspond to those in the first embodiment, and the bonded joint between the work area 20 and the bonding area 30 is formed as in the first embodiment, their re-description will not be repeated in detail.

As in the first embodiment, the working area 20 forms the area of the tool cutting body 210, which in machining mainly contacts the material of the workpiece to be machined. Of the

Anbindungsbereich 30 forms the region of the tool-cutting body 210, via which the tool-cutting body 210 cohesively with the

Tool body 201 is made of steel. The inner side 15 facing away from the main free surface 12 and the rear side 14 facing away from the rake face 11, which in each case are joining surfaces 19 for bonding by soldering to the tool main body 201, are at the connection region 30 formed. The main cutting edge 13 and the adjoining areas of the rake face 11 and the main relief face 12 are formed on the working area 20.

The work area 20 is integrally connected to the connection area 30, so that the tool cutting body 210 is formed as a whole joined cohesively. Also in the second embodiment, the working area 20 and the connection region 30 are preferably connected to one another in a material-locking manner over their entire contact surface. As can be seen in FIG. 14, the contact surface over which the working region 20 and the connection region 30 are connected to one another in a material-bonded manner has at least two surface regions 21a and 21b which are not parallel to one another. In the second embodiment shown in FIGS. 12 to 14, the contact surface between the working region 20 and the connection region 30 extends as a whole curved, so that the non-parallel to each other

Surface regions 21a and 21b are parts of an overall contiguous, curved contact surface. A first surface region 21a of the two non-parallel surface regions is located on a side of the working region 20 facing away from the main relief surface 12. A second surface region 21b of the two non-parallel surface regions is arranged on one side of the working region 20, which faces away from the rake face 11 is. In this way it is achieved that the work area 20

at least two sides of the connection region 30 is surrounded, so that a good support of the working area 20 is given to the connection region 30 both opposite to the clamping surface 11 forces acting as well as against substantially acting in a direction perpendicular to the main surface 12 forces. Furthermore, in this way is also in the

Tool 200 according to the second embodiment between the

Work area 20 of the silicon-containing ceramic and the

Tool body 201 made of steel everywhere the connection area 30, so no direct contact area between the working area 20 and the

Tool body 201 is given. As can be seen in FIGS. 12 to 14, in the illustrated second embodiment the working area 20 with the main cutting edge 13 extends along the entire lateral edge of the tool cutting body 210, so that a very long main cutting edge 13 is formed overall.

FIRST CONVERSION

A first modification of the tool cutting body 210 according to the second embodiment is shown in FIG.

The tool cutting body 2 0 according to this first modification

only differs from the embodiment described above in that the working area 20 does not extend along the entire lateral edge of the tool cutting body 210, but extends only to a front end, which forms an axial free end in the use of the tool 200 and ends on the other side in front of the other front end of the connection region 30 and is partially enclosed by this. In this way, the material of the working area 20 can be reduced and, moreover, an axial support of the working area 20 via the connection area 30 is also made possible.

SECOND AND THIRD DIFFERENCE

A second modification of the second embodiment is shown in FIG. 16, and a third modification of the second embodiment is shown in FIG.

The tool cutting body 210 according to the second modification

differs from the tool cutting body according to the second embodiment in Fig. 14 only in the configuration of the contact surface between the work area 20 and the connection region 30th

Likewise, according to the third modification, the tool cutting body 210 according to the third modification differs from the tool cutting body 210 according to the first modification only in the configuration of this contact surface, so that only this difference will be explained in more detail. In the second and third modifications of the second embodiment, the non-parallel surface portions 21a and 21b are not formed as parts of a generally contiguous curved contact surface, but as separate surfaces at an obtuse angle to each other. Again, however, a first surface area 21a is located on a side of the working area 20 facing away from the main free area 12 and a second surface area 21b of the two non-parallel areas

Surface areas are arranged on one side of the working area 20, which faces away from the clamping surface 11.

As a further modification, in particular the described with reference to the first embodiment, different embodiments of

Contact surface between the work area 20 and the connection region 30 can also be realized in the second embodiment and its modifications.

Further, even in the tool cutting body 210 according to the second embodiment and its modifications, a chip breaker 18 may additionally be incorporated in the rake face 11.

Claims

claims

1. tool cutting body (10; 210) for soldering with a

Tool base body (1; 201) made of steel, wherein the tool cutting body (10; 210).

a working area (20) made of a silicon-containing ceramic and a connection area (30) made of a WC-based hard metal, a

Mo base material or a W base material,

wherein the working area (20) and the connection area (30) are arranged on at least two surface areas (21a, 21b) which are not parallel to one another.

21b) of the ceramic are firmly bonded together,

wherein the connection region (30) has at least one joining surface (19) for materially bonded connection by soldering to a tool main body

(1).

2. Tool cutting body according to claim 1, wherein the difference in the thermal expansion coefficient between the ceramic and the connection region (30) <2 * 10 " ⁶ K ¹ .

3. Tool cutting body according to claim 1 or 2, wherein the

silicon-containing ceramic having a thermal expansion coefficient α <4 ^* 10 ^"6 K" ^1, preferably <3.7 ^* 10 ^-6 K ^-1.

4. Tool cutting body according to one of the preceding claims, wherein the connection region (30) has a thermal

Expansion coefficient α in the range of 4 ^* 10 ^"6 K ^{" 1} to 6 ^* 10 ⁶ K \ preferably from 4.5 * 10 " ⁶ K ' ¹ to 5.5 * 10" ⁶ K ¹ , has.

5. Tool cutting body according to one of the preceding claims, wherein the working area (20) has a rake face (11) and a

Main free surface (12) and the two non-parallel surface portions (21a, 21b) on a side facing away from the main surface (12) and on a side facing away from the chip surface (11) side of the working area (20) are arranged.

6. Tool cutting body according to one of the preceding claims, wherein the working area (20) and the connection area (30) via a solder having a liquidus in the range of 750 ° C - 1050 ° C, preferably 800 ° C - 1000 ° C, with each other are connected.

7. Tool cutting body according to one of the preceding claims, wherein the silicon-containing ceramic is S13N4 or a SiAlON.

8. Tool cutting body according to one of the preceding claims, wherein the silicon-containing ceramic is a non-oxide ceramic.

9. Tool cutting body according to one of the preceding claims, wherein the connection region (30) is formed of WC-based hard metal.

10. Tool cutting body according to one of the preceding claims, wherein the tool cutting body (10; 210) a cutting element for a cutter or drill or a saw tooth for a circular or

Band saw is.

11. Tool (100; 200) with a tool base body (1; 201) made of steel and at least one tool cutting body (10; 210) according to one of the preceding claims, wherein the at least one joining surface (19) of the connection region (30) cohesively with the tool base body (1) is connected.

12. Tool according to claim, wherein the at least one joining surface (19) by means of a solder having a melting temperature of £ 720 ° C with the

Tool base body (1) is connected.

13. Tool according to claim 11 or 12, wherein the difference in

thermal expansion coefficient α between the

Tool body (1) and the connection area (30) is more than twice as large as the difference in the thermal

Expansion coefficient α between the connection region (30) and the silicon-containing ceramic.

14. Use of a tool-cutting body (10) according to one of

Claims 1 to 10 for materially connecting the

Connection area (30) by soldering with a tool base body (1) made of steel.

15. A method for producing a tool, wherein a tool cutting body (10) according to one of claims 1 to 10 is connected by soldering at a temperature .s 720 ° C with a tool base body (1) made of steel.