A milling device is rotatable in one direction around a longitudinal center axis defining a forward direction and an opposite rearward direction, and includes a front part and a rear part. The front part has cutting edges, each having a longitudinal extension, and chip flutes, each having a longitudinal extension. The front part is made of a monolithic piece of ceramic. The rear part is configured to be fixed in a rotatable tool body or a rotatable chuck. The rear part is also made of a monolithic piece of cemented carbide. A front end surface of the rear part has a smaller area than a rear end surface of the front part. The front end surface of the rear part and a rear end surface of the front part are permanently bonded or brazed to each other by a joint.

A chamfer tool which comprises a tool holder. The tool holder extends along a central axis and comprises a plurality of slot-shaped cutting insert receptacles, each having two opposing lateral abutment surfaces and a base abutment surface arranged between the two lateral abutment surfaces and extending transversely thereto. The chamfer tool further comprises a plurality of cutting inserts, which are fixed in the plurality of cutting insert receptacles in a firmly bonded manner, wherein each of the cutting inserts comprises two opposing lateral surfaces, which abut against or are connected in a firmly bonded manner to the two lateral abutment surfaces of the respective cutting insert receptacle, and a lower surface arranged between the two lateral surfaces and extending transversely thereto, wherein the lower surface abuts against or is connected in a firmly bonded manner to the base abutment surface of the respective cutting insert receptacle. The cutting inserts project out of the first cutting insert receptacles both in an axial direction, which is parallel to the central axis of the tool holder, and transversely to the axial direction. Each of the cutting inserts comprises a main cutting edge which is oriented at a first acute angle to the central axis of the tool holder.

This milling cutter includes: a blade part 10 having a plurality of tips 12 each having an end cutting edge 121 and a peripheral cutting edge 122, and a blade-body portion 11 which is a plate-shaped body with the plurality of tips 12 fixed to an outer circumference thereof and has a groove 113 in accordance with a position of each tip; and a body 20 being rotatable around a rotational axis and having a front-end portion 21 having a front-end surface to which a rear-end surface of the blade-body portion 11 is fixable detachably and in close contact therewith, and a front-end outer-circumferential portion whose outer diameter is 100/100 to 97/100 using an outer diameter of the blade part 10 as a reference, the front-end outer-circumferential portion having a body-side groove 211 continuous to the groove 113 of the blade-body portion 11 contacted closely.

A green body is provided. The green body is made of a superhard material, is used for being fixed on a matrix so as to be machined into a cutting edge part of a cutter. The green body includes a first side surface and a second side surface. Both the first side surface and the second side surface twist at a set helical angle. After being fixed to the matrix, the green body is machined into an edge part for cutting, such as a main cutting edge and a center cutting edge located on the green body made of a same superhard material. The green body is applied to machining the cutting edge of the cutter. A rotating center has a continuous and intact center cutting edge formed by a superhard material.

The invention provides a dental milling tool for milling dental materials in the making of dental prostheses. The dental milling tool is a ball-nose end mill having three helical flutes, each flute being associated with a cutting edge, each cutting edge having chip breakers along the curved edges of the ball. The dental milling tool may be formed from a hard material such as carbide based material, ceramic, cermet, superhard materials including polycrystalline diamond (PCD) and cubic boron nitride (CBN), and diamond composite. Alternatively, the dental milling tool may be coated with a hard coating such as diamond coating, diamond-like-carbon (DLC), nitride based coating such as titanium aluminium nitride (TiAlN), aluminium titanium nitride, (AlTiN), and titanium nitride (TiN), and ceramic coating.

A method for machining a ceramic matrix composite (CMC), the method enhancing a machining speed for the ceramic matrix composite (CMC), includes: a step of scanning an irradiated portion of a surface of a machining target material by a laser head to irradiate the irradiated portion with laser light from the laser head, and forming a deteriorated layer on the irradiated portion of the surface of the machining target material; and a step of sequentially removing the deteriorated layer by an end mill, the deteriorated layer being formed on the irradiated portion, wherein the deteriorated layer is formed by heating the irradiated portion up to a predetermined temperature by irradiation of continuous oscillation laser light, and by forming a crack by irradiation of pulsed oscillation laser light.

The present invention includes an end mill body which is formed of ceramic, a chip discharge flute which is formed on an outer periphery of the end mill body, a peripheral cutting edge which is formed on an intersection ridge line between a wall surface facing a tool rotation direction in the chip discharge flute and an outer peripheral surface of the end mill body, an end cutting edge which is formed on an intersection ridge line between the wall surface in the chip discharge flute and a tip surface of the end mill body, and a corner cutting edge which is positioned at a tip outer-peripheral part of the end mill body, connects an outer end of the end cutting edge and a tip of the peripheral cutting edge to each other, and has a convexly curved shape which is convex toward a tip outer-peripheral side of the end mill body.

Ceramic end mill with cutting edge portion including gashes between cutting edges and adjacent in a rotation direction. Center cut edges are formed at end cutting edges close to and facing rotation axis O. Center grooves are formed on rear sides of center cut edges and end cutting edges in the rotation direction continuous with a radial direction. The center grooves are continuous with positions where end cutting edge second surfaces face or approach rotation axis O. End cutting edge second surfaces are laid between center cut edges and end cutting edges. Center grooves are formed between end cutting edge second surfaces and center cut edges positioned on a rear side of end cutting edge second surfaces in the rotation direction. The center grooves pass on rotation axis O. Center grooves double as rake faces of the respective center cut edges and are continuous with the gashes.

Device for producing tooth replacements, which device has a milling cutter (36) for shaping the front face of the tube portion (16), which milling cutter (36) has at least one abutment face which is intended to bear at least indirectly on a surface of the abutment (10), in particular on the collar (14) of the abutment, and via which milling cutter (36) the length or height of the tube portion (16) of the abutment (10) can be fixed, in particular the tube portion can be shaped. Tool set consisting of a milling cutter (36) and of a sleeve (42), wherein at least one abutment face (76) is formed on the milling cutter and extends towards the sleeve (42), and wherein the sleeve (42) has a supporting face (78), in particular for supporting on an abutment (10).

A coated cutting tool includes a substrate and a coating layer formed onto the surface of the substrate. The coating layer contains an outermost layer. The outermost layer contains NbN. The NbN contains cubic NbN and hexagonal NbN. When a peak intensity at a (200) plane of cubic NbN is made I.sub.c, a peak intensity at a (101) plane of the hexagonal NbN is made I.sub.h1, and a sum of peak intensities at a (103) plane and a (110) plane of the hexagonal NbN is made I.sub.h2 in X-ray diffraction analysis, a ratio [I.sub.h1/(I.sub.h1+I.sub.c)] of I.sub.h1 based on a sum of I.sub.c and I.sub.h1 is 0.5 or more and less than 1.0, and a ratio [I.sub.h1/(I.sub.h1+I.sub.h2)] of I.sub.h1 based on a sum of I.sub.h1 and I.sub.h2 is 0.5 or more and 1.0 or less.