AT15546U1 - Tool cutting body, tool and method for its production - Google Patents

Abstract

A tool cutting body (10) for soldering to a tool base (1) made of steel is provided. The tool cutting body (10) has 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. The working area (20) and the connection area (30) are connected in a material-locking manner to at least two non-parallel surface areas (21a, 21b) of the ceramic. The connection region (30) has at least one joining surface (19) for bonding by soldering to a tool base body (1).

Description

description

TOOL CUTTING BODY, TOOL AND METHOD FOR THE PRODUCTION THEREOF

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 manufacturing a tool.

In machining machining with particular rotating tools, it is known to use as cutting with the material to be machined cutting tool-cutting body made of a hard, resistant material on a tool body made of a much tougher material, especially steel , are arranged. In addition to tool cutting bodies which are mechanically driven by e.g. Screwing or by clamping be attached to the tool body, in particular also implementations have prevailed, in which the tool-cutting body cohesively 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 cemented carbide, the hard material particles are formed at least predominantly by tungsten carbide (WC), although smaller amounts may also contain other hard material particles, in particular carbides of the elements of groups IV to VI of the Periodic Table of the Elements.

For some time, there are increasing efforts to form the cutting edge areas of tools, such as in particular circular or band saws, milling cutters or drills made of ceramic materials to achieve improved machining or longer service life in the machining of some materials. Silicon-containing ceramics, in particular silicon nitride (Si 3 N 4) and SiAION (a group of ceramics consisting of the elements silicon, aluminum, oxygen and nitrogen) or silicon carbide (SiC), are particularly promising for the machining process because of 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, especially if a cohesive connection with the tool body is sought. 1 2 3 1

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. 2

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. 3

The tool-cutting body has a work area made 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 region has at least one joining surface for substance-locking connection by soldering to a tool main body. Due to the cohesive connection of the ceramic to the at least two surface areas, a reliable support of the working area is achieved at the connection area. 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-base 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 a temperature range between 750 ° C and 1050 ° C, which is not critical for the material of the connection region, but would be problematic for a steel tool body. In this way, a cohesive connection to the silicon-containing ceramic can be reliably formed, which would not be possible at lower temperatures. Under Mo base material or W-base material is to be understood as a material whose main component in weight percent is molybdenum or tungsten. 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 be part of a uniform curved 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 coefficient of thermal expansion between the silicon-containing ceramic and the connection area and on the other hand, a formation of a material connection between the connection area and a tool base body made of steel by brazing at relatively low, uncritical for the steel temperatures, so that a total of a very reliable cohesive connection of the silicon-containing ceramic can be realized to the tool body. 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. In this case, the tool cutting body may preferably be constructed such that all contact surfaces to the tool base body are formed by the material of the connection region. 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 is less than 2 * 10 "1 K" 1. In this case, the stresses acting on the bonded portions of the ceramic surface portions can be kept low. A larger difference in the coefficient of thermal expansion at the connection points between the connection region and the tool body made of steel, however, is due to the material pairing formed there as much less critical. The difference in the coefficient of thermal expansion can therefore be advantageous to relatively unproblematic in comparison interface between the material of the connection area and the steel of the tool body are moved. 2 3 1 2

According to a development, the silicon-containing ceramic has a thermal expansion coefficient α of less than 4 * 10 "1 K" 1. In this case, the advantages described are particularly clear. Preferably, the thermal expansion coefficient can be less than 3.7 * 10 "1 K" 1. The coefficient of thermal expansion is preferably at least 2.8 * 10 -1 K -1 so that the difference with the bonding region does not become too large. 3

According to a development, the connection region has a thermal expansion coefficient α in the range of 4 * 10 "1 K" 1 to 6 * 10 "1 K" 1. In this case, the difference in the thermal expansion coefficient between the silicon-containing ceramic and the connection region is so small that a reliable and stable cohesive connection is achieved. Preferably, the bonding region has a coefficient of thermal expansion in the range of 4.5 * 10 "1 K" 1 to 5.5 * 10 "1 K" 1.

According to one embodiment, the work area has a rake face and a main flank and the two non-parallel surface areas are arranged on a side remote from the main flank 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 development of the work area and the connection area via a solder having a liquidus temperature in the range of 750 ° C - 1050 ° C, preferably 800 ° C - 1000 ° C, connected to each other. In this case, a stable cohesive connection between the working area and the connection area can be reliably obtained.

According to a development, the silicon-containing ceramic Si3N4 or a SiAION. 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 of the connection area of WC-based hard metal is formed. In this case, the thermal expansion coefficient may be 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 one embodiment, 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 advantages are 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 tool body made of steel and at least one of the previously described tool cutting body. The joining surface of the connection region is integrally connected to the tool body. The joint surface of the attachment region may e.g. For example, preferably be connected by soldering to the tool body. In particular, moreover, for example, more than one joining surface can be provided. A tool is provided in which a work area made of a silicon-containing ceramic material is reliably connected in a materially cohesive manner to a tool base body and in which problematic stress concentrations occurring at connection points can be reliably avoided.

According to one embodiment, the at least one joining surface is connected by means of a solder with a melting temperature <720 ° C with the tool body. In this case, damage to the tool body made of steel due to excessive temperatures in the cohesive joining can be reliably prevented and at the same time the cohesive connection between the working area and the connection area is not adversely affected.

According to a development, the difference in the coefficient of thermal expansion between the tool body and the connection area is more than twice as large as the difference in the thermal expansion coefficient between the connection region and the silicon-containing ceramic. Preferably, the difference in coefficient of thermal expansion between the tool body and the bonding region may be more than three times as large as the difference in thermal expansion coefficient between the bonding region and the silicon-containing ceramic. In this case, problematic stresses in the area of the much more critical cohesive connection between the silicon-containing ceramic and the connection region are reliably avoided.

The object is also achieved by using a tool-cutting body described above for cohesively connecting the connection region by soldering with a tool base made of steel.

The object is further achieved by a method according to claim 15 for producing a tool in which a tool-cutting body described above is connected by soldering at a temperature <720 ° C with a tool base made of steel.

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

In the figures: FIG. 1 shows a schematic representation of a tool having a plurality of

Tool cutting bodies according to a first embodiment; Fig. 2: an enlarged detail of a marked in Fig. 1 with II

Area of the tool; Fig. 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; FIG. 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 tool

Cutting body; 8 is a perspective view of a fourth modification of the tool

Cutting body; 9 is a perspective view of a fifth modification of the 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; Fig. 11 b) another view of the tool-cutting body according to the seventh

Modification; Fig. 12: a schematic perspective view of a tool with a

Plurality of tool cutting bodies according to a second embodiment; Fig. 13: 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. 15 is a perspective view of a first modification of the tool

Cutting body in the second embodiment; 16 is a perspective view of a second modification of the tool

Cutting body in the second embodiment; and [0041] FIG. 17 is a perspective view of a third modification of the 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, however, the tool body 1 may be 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 the tool base 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 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 bodies 10 are arranged in a manner known per se such that the chip face serving as rake surface 11 is arranged facing the respective recess 2. At a transition from the rake surface 11 to a main surface 12 facing the outer periphery, a main cutting edge 13 is formed.

The respective tool-cutting body 10 is connected on its side facing away from the rake face 11 back 14 and on its side remote from the main face 12 inner side 15 materially connected to the respective, formed on the tool body 1 made of steel seat. The tool-cutting body 10 is connected with a solder having a melting temperature of <720 ° C cohesively with the tool base body 1 made of steel in order to reliably avoid adverse effects on the material properties of the tool body 1 during soldering.

In the following, 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 made of different materials. The working area 20 forms the area of the tool-cutting body 10, which comes into contact with a machining mainly 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 integrally connected to the tool base body 1 made of steel. The side facing away from the main free surface 12 inside 15 and facing away from the rake face 11 back 14, each joining surfaces 19 for material bonding by soldering to the tool body 1 are thus formed on the connection region 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 formed of a silicon-containing ceramic with a very low coefficient of thermal expansion α, which is smaller than 4 * 10'6 K'1. The thermal expansion coefficient α is preferably less than 3.7 * 10 -6 K -1. The silicon-containing ceramic is preferred in the embodiment, e.g. formed by Si3N4 or a SiAION. It can be formed in particular by a non-oxide ceramic such as Si3N4.

The connection region 30 is formed of a material that has a coefficient of thermal expansion α, which is greater than the thermal expansion coefficient α of the silicon-containing ceramic, but by less than 2 * 10 "6 K" 1 of the thermal see Expansion coefficient α of the silicon-containing ceramic differs. The attachment region 30 has a thermal expansion coefficient 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 -6 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. In particular, in a realization of the connection region 30 of a WC-based cemented carbide, the thermal expansion coefficient can be adjusted in a simple manner over the amount of the 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 integrally joined material. 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, via which the working region 20 and the connection region 30 are connected to one another in a material-locking manner, has at least two surface regions 21a and 21b which are not parallel to one another. 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 is surrounded on at least two sides by the connection area 30, so that a good support of the working area 20 at the connection area 30 both against forces acting on the rake face 11 and substantially in the direction perpendicular to the main face 12 acting forces is given. Furthermore, in this way, in the tool 100 between the working area 20 of the silicon-containing ceramic and the tool base 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 connected to one another via a solder having a liquor temperature in the range of 750 ° C. to 1050 ° C., preferably in a range of 800 ° C. to 1000 ° C. In this case, e.g. the work area 20 are connected via an active solder with the connection region 30 in order to achieve a reliable cohesive connection of the silicon-containing ceramic. Alternatively, the silicon-containing ceramic of the working region 20 can also be metallized in a first step in the region of the contact surface to the connection region 30 and then connected to the connection region 30 by means of a conventional solder.

The ceramic of the working area 20 and the material of the connection area 30 hold such high temperatures, which would be detrimental to the steel of the tool body 1, easily 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 interconnected, in a simple manner with conventional soldering machines at a temperature below 720 ° C. by means of 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 would be adversely affected or the cohesive connection between the working area 20 and the Anbindungsbe rich 30 would be at risk. Furthermore, in this way, the production of the tool-cutting body 10 can take place in time and space separate from the material-fit joining to the tool body 1 made of steel, so that e.g. a standardized tool-cutting body 10 in combination with a plurality of different tool body 1 can be used.

The coefficient of thermal expansion of the connection region 30 can preferably be selected or set such that the difference in the thermal expansion coefficient α between the tool body 1 and the connection region 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 of the working area 20. In this way it is ensured that the difference in the coefficient of thermal expansion between the working area 20 and the connection area 30 is small. This is particularly advantageous with regard to the rather critical cohesive joint between the working region 20 of the silicon-containing ceramic and the connection region 30. The cohesive joint between the connection region 30 and the tool base 1 made of steel, however, is clearly due to the good solderability of the material of the connection region 30 unproblematic, so that there is also a higher difference in the coefficient of thermal expansion is acceptable, in particular to the relatively large thermal expansion coefficient of conventional tool steel, which is in the range of about 12 * 10 "6 K" 1 to 14 * 10 "6 K" 1. Particularly in the case of WC-based hard metal as material for the connection region 30, the relatively high modulus of elasticity of the cemented carbide advantageously limits the composite stress acting on the silicon-containing ceramic of the working region 20.

As can be seen in particular in FIGS. 2, 3 and 4, the tool cutting body 10 has, in the area of the rake face 11, a chip breaker 18 which is formed as a recess in the material of the working area 20. Although the chip breaker 18 in the specific embodiment shown has the form of such an elongated recess, other shapes are possible. In particular, the chip breaker 18 may also have a more complex three-dimensional design. However, the realization of the chip breaker 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 chip breaker 18 allows a particularly advantageous chip forming and chip removal when using 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. 5.

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 no additional chip-guiding 18 is formed in the rake face 11. 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 configuration of the contact surface between the work area 20 and the connection region 30. In contrast to the first embodiment and the first modification thereof 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. Again, however, a first surface region 21a is located on a side of the working region 20 remote from the main relief surface 12 and a second surface region 21b of the two non-parallel surface regions is arranged on a side of the working region 20 which faces away from the rake surface 11.

Also in the second modification, the rake face 11 may be further provided with a chip breaker 18 as described with respect to the first embodiment.

THIRD IMPROVEMENT

The third modification shown in FIG. 7 differs from the above-described second modification in that only the first surface portion 21a and the second surface portion 21b of the non-parallel surface portions forming the contact surface are at an acute inner angle to each other 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, a chip-guiding step 18 can again be formed in the clamping surface 11.

FOURTH DIFFERENCE

The fourth modification shown in FIG. 8 differs from the second modification described above, which is shown 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 surface 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 configuration of the span-side region of the connection region 30. In particular, the connection region 30 is tapered with increasing distance from the main cutting edge 13 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 the connection region 30.

Also in the fifth modification, a chip breaker 18 can be additionally formed in the material of the working area 20. Although in the fifth modification, an embodiment of the non-parallel surface portions 21a and 21b serving as a contact surface is shown as in the second modification, corresponding configurations of the contact surface are again possible with FIGS. 5 and 7.

SIXTH ADAPTATION

A sixth modification of the tool-cutting body 10 is shown schematically in Fig. 10. The tool-cutting body 10 according to the sixth modification differs only in the embodiment of the contact surface over which the working area 20 and the connection region 30 are materially connected to each other, of 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 11b). In the seventh modification, the tool-cutting body 10, in turn, in the region of the rake face 11 has 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 depression of the chip breaker 18 is not only formed in the material of the working region 20, but extends further into the material of the attachment region 30, so that the tool cutting body 10 is formed in the form of a groove.

The contact surface, by means of which the working region 20 and the connection region 30 are connected to one another in a material-bonded manner, can be separated from the mold by e.g. be formed as in the first embodiment or one of their 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. However, according to a modification, the tool body 201 may be 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 tool base body 201 made of steel on its outer periphery on a plurality of flutes-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 integrally 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 first embodiment described above, the respective tool-cutting body 210 is on its side facing away from the clamping surface 11 back 14 and on its side facing away from the main surface 12 inner side 15 firmly bonded to the respective, formed on the tool body 201 made of steel seat connected. The tool-cutting body 10 is in turn connected with a solder having a melting temperature of <720 ° C cohesively with the tool base 201 made of steel in order to reliably avoid adverse effects on the material properties of the tool body 201 during soldering.

Although the tool cutting body 210 in the second embodiment has a slightly different shape than the above-described tool cutter 10 according to the first embodiment due to its other functionality, on the other hand, it also has a working region 20 of a silicon-containing ceramic and a bonding region 30 of a WC-based hard metal, a Mo base material or a W-base material, which are materially connected to each other at least two mutually nonparallel surface areas 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 comes in contact mainly with the material of the workpiece to be machined in a machining. The connection region 30 forms the region of the tool-cutting body 210, via which the tool-cutting body 210 is integrally connected to the tool base 201 made of steel. The inner side 15 facing away from the main relief 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 formed on the attachment region 30. 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 region 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 via which the working region 20 and the connection region 30 are connected to one another in a material-locking 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 attachment region 30 extends curved as a whole, 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 is. In this way, it is achieved that the working area 20 is surrounded on at least two sides by the connection area 30, so that a good support of the working area 20 at the connection area 30 both against forces acting on the rake face 11 and substantially in the direction perpendicular to the main face 12 acting forces is given. Further, in this way, even in the tool 200 according to the second embodiment, between the work area 20 made of the silicon-containing ceramic and the tool base 201 made of steel, the connection area 30 is everywhere, so that there is no direct contact area between the work area 20 and the tool base 201.

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

FIRST CONVERSION

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

The tool cutting body 210 according to this first modification differs from the previously described embodiment only in that the working area 20 does not extend along the entire lateral edge of the tool cutting body 210, but only up to a front end, the in the use of the tool 200 forms an axial free end, extends 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. 17.

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 working area 20 and the connecting area 30. Likewise, the tool cutting body 210 is different according to the third modification of 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 region 21a is located on a side of the working region 20 remote from the main relief surface 12 and a second surface region 21b of the two non-parallel surface regions is arranged on a side of the working region 20 which faces away from the rake surface 11.

As further modifications, in particular the different configurations of the contact surface between the working area 20 and the connecting area 30 described with reference to the first embodiment can also be realized in the second embodiment and its modifications.

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

Claims (15)

claims 1. Tool cutting body (10; 210) for soldering to a tool base body (1; 201) made of steel, wherein the tool cutting body (10; 210) comprises: a working area (20) made of a silicon-containing ceramic and a connection area (30) from a WC-based hard metal, a Mo base material or a W-base material, wherein the working region (20) and the connection region (30) are integrally connected to one another at at least two non-parallel surface regions (21a, 21b) of the ceramic , wherein the connection region (30) has at least one joining surface (19) for materially bonded connection by soldering to a tool base 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 is. 3. Tool-cutting body according to claim 1 or 2, wherein the silicon-containing ceramic has 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" 1, preferably 4.5 * 10 " 6 K "1 to 5.5 * 10" 6 K "1. 5. Tool cutting body according to one of the preceding claims, wherein the working area (20) has a rake face (11) and a main face (12) and the two mutually non-parallel surface areas (21a, 21b) on one of the main face (12). side facing away from and on one of the rake surface (11) facing away from the work 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 Si3N4 or a SiAION. 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) is a cutting element for a cutter or drill or a saw tooth for a circular or band saw. 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 11, wherein the at least one joining surface (19) by means of a solder having a melting temperature <720 ° C with the tool base body (1) is connected. 13. Tool according to claim 11 or 12, wherein the difference in the coefficient of thermal expansion α between the tool base body (1) and the connection region (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 ceramics. 14. Use of a tool-cutting body (10) according to one of claims 1 to 10 for the material-locking connection of the connection region (30) by soldering to a tool base body (1) made of steel. 15. A method for producing a tool in which a tool-cutting body (10) according to one of claims 1 to 10 by soldering at a temperature <720 ° C with a tool base body (1) made of steel is connected.