The disclosed technology includes a cutting tool comprising segments arranged around a periphery of a cutting tool. Each segment, of the plurality of segments comprising a first portion comprising a first material having a first hardness, a second portion comprising a second material having a second hardness, the second hardness being less than the first hardness, and a transition region. The transition region can include at least part of the first material and at least part of the second material. The transition region can have an overall third hardness that is less than the first hardness and greater than the second hardness. A first segment and a second segment of the plurality of segments can be attached to the periphery of the cutting tool such that at least the first portion of the first segment is aligned in a cutting direction with the second portion of the second segment.

The disclosed technology includes an abrasive cutting tool having a plurality of segments arranged around a periphery of the cutting tool. The plurality of segments can include a first segment having a first portion having a first concentration of abrasive material, and a second portion having a second concentration of abrasive material. The second concentration can be less than the first concentration. The cutting tool can have a second segment having a third portion having a concentration of abrasive material that can be similar to the concentration of the first portion, and a fourth portion having a concentration of abrasive material that can be similar to the concentration of the second portion. The first portion and the second portion can be reciprocally arranged in relation to the third portion and the fourth portion around the periphery of the cutting tool.

A machining segment for a machining tool which is rotatable in a direction of rotation about an axis of rotation includes an underside where the machining segment is connectable to a basic body of the machining tool by the underside. A machining zone has a matrix material and a plurality of first hard material particles where the plurality of first hard material particles are disposed in the matrix material in accordance with a defined particle pattern. Each of the plurality of first hard material particles has a respective projection in relation to the matrix material on an upper side of the machining segment. The projection of at least one of the plurality of first hard material particles is greater than 400 μm.

The invention describes an apparatus (1) for a cutting edge preparation of cutting tools (5), in particular of drills or milling tools or similar tools (5), in particular of hard-metal cutting tools, wherein during a relative movement the cutting tool (5) interacts in a machining fashion with a flexibly-bonded grinding body (2) that is provided with abrasive particles, the particles of the grinding body (2) influencing the edge geometry of the cutting tool (5),

wherein the grinding body (2) is adapted with its dimensions substantially to the dimensions of the respective cutting tool (5) that is to be prepared and is accommodated in an exchangeable holder (4) which is arranged in a region of a processing device, in particular of a tool grinding machine, and is held such that it is machinable by the cutting tool (5) for the cutting edge preparation. Furthermore, a corresponding method and a corresponding grinding body (2) are given.

Method for producing a machining segment (51) for a machining tool from a powdered or granular first matrix material (56), first hard material particles (57), which are arranged according to a defined first particle pattern, and second hard material particles (58), which are arranged according to a defined second particle pattern, the machining segment being connected by an underside (61) to a basic body of the machining tool. The machining segment (51) has on the side surfaces a projection of the second hard material particles (58) with respect to the first matrix material (56).

Method for producing a green body for a machining segment (51) from a powdered or granular first matrix material (56), first hard material particles (57) and second hard material particles (58), the machining segment being connected by an underside (61) to a basic body of a machining tool. The machining segment (51) has a projection of the second hard material particles (58) with respect to the first matrix material (56) on the side surfaces.

Method for producing a green body for a machining segment (51) from a powdered or granular first matrix material (56) and first hard material particles (57), the machining segment being connected by an underside (61) to a basic body of a machining tool. The machining segment (51) has a projection (Δ) of the first hard material particles (57) on an upper side (62) opposite from the underside (61).

Method for producing a green body for a machining segment (51) from a powdered or granular first matrix material (56) and first hard material particles (57), the machining segment being connected by an underside (61) to a basic body of a machining tool. The machining segment (51) has a projection (Δ) of the first hard material particles (57) on an upper side (62) opposite from the underside (61).

An abrading tool includes a base member having a support portion defining a first level, and a plurality of integral raised islands extending upwardly above the first level. The base member may be formed of metal or a non-conductive material. The islands are spaced apart from one another. Each island includes a respective tip portion. The distance between adjacent islands may be greater than the width of a single island. An abrasive composite material, including a carrier material and particles of an abrasive material, is affixed to the tip portions of at least some of the islands. The abrasive material may be applied by electroplating, electro-less plating, brazing or another method. The abrasive material is applied only to the tip portion of the islands, such that the first level of the support portion is substantially free of the abrasive material. Methods of making the abrading tool are also described.

The invention relates to a grinding wheel for the material-removing machining of at least one workpiece, preferably a grinding wheel for the simultaneous material-removing machining of at least two flat workpieces, wherein the grinding wheel is provided with a base body and a grinding layer arranged thereon for the grinding machining of the at least one workpiece, and wherein the grinding layer comprises a plurality of surface segments, wherein, in each case, a plurality of surface segments is provided both in the circumferential direction and in the radial direction. In order to specify a grinding wheel with which both harder and softer workpieces can be machined with good machining results and good wear behavior of the grinding wheel, the grinding layer should comprise at least two different types of surface segments with different degrees of hardness.