Abstract: A tool is made in a coating vessel, depositing upon the base tool body of a hard metal or cermet, a coating by chemical vapor deposition by admitting to the vessel a reactive gas mixture capable of forming a composition selected from the group which consists of aluminum oxide and of titanium and zirconium carbide, nitride and carbonitride, and of mixtures thereof at a chemical vapor deposition pressure and temperature; and interrupting the chemical vapor deposition by a multiplicity of times by replacing the reactive gas mixture with a nonreactive gas mixture containing components selected from the group which consists of argon, hydrogen, nitrogen and mixtures thereof, lowering a pressure in the vessel to a plasma chemical vapor deposition pressure of 10 to 1000 Pa, effecting a glow discharge at the body with the body being cathodically connected at a negative D.C.

Abstract: A cutting mill kit includes a basic body formed with a plurality of peripheral recesses which receive respective cassettes and cutting inserts and an annular support element which is provided with at least one formation receiving a respective gib. The gib provides an axial support for the cassette and has a width lesser than a width of the cassette.

Abstract: A cermet including a cermet core zone in which the content of a binder amounts to at most 90% by mass in relationship to a cermet hard phase is formed with a 0.01 to 3 um deep surface layer having an increased resistance to wear compare to the cermet core zone.

Abstract: A cutting insert is formed with a cutting surface, a side surface joining the cutting surface at a cutting edge, and a wedge-shaped chip-shaping element formed on and raised above the cutting surface. The chip-shaping element has a width that increases uniformly away from the cutting edge, a pair of generally planar side flanks extending at an acute angle to each other, ascending away from the cutting surface away from the cutting edge, and defining a rounded upper edge extending toward the cutting edge, and a rear flank descending from the side flanks toward the cutting surface away from the cutting edge.

Abstract: A cutting insert for material removal machining includes a cutting face formed with a longitudinal cutting edge and with a succession of spaced apart rearwardly widening recesses extending along the cutting edge and at least one of the recesses having a respective rib extending along a longitudinal axis transversely to the cutting edge.

Abstract: A rotary boring tool has a body formed relative to a normal forward cutting direction with a main cutting edge extending transversely of the direction, a pair of side cutting edges extending backward in the direction from ends of the main cutting edge, a substantially planar front face extending substantially perpendicular to the direction from the main cutting edge, and a curved cutting face extending backward in the direction from the main cutting edge between the side edges.

Abstract: A tool assembly has a tool holder having a holder support face, a clamping dog having a dog surface spaced from and facing the holder support face, and a tool between the holder and the dog and having an end cutting edge, a face directly confronting the support face, and a surface directly confronting the dog surface. One of the surfaces is formed with a recess and the other surface is formed with a bump engageable in the recess. The dog surface can be pressed in a clamping direction generally perpendicular to the faces and surfaces toward the support surface and to clamp the tool between the dog and the support. The bump and recess are so dimensioned that they engage each other at at least three locations spaced from one another perpendicular to the clamping direction.

Abstract: A cutting insert is formed with a cutting edge, a cutting corner at an end of the cutting edge, a cutting surface, and a row of raised scales extending along the cutting edge. Each scale is formed with an arcuate apex line transverse to the cutting edge and forming at the cutting edge relative to a perpendicular to the cutting edge an angle between 55.degree. and -5.degree., a steep flank to one side of the apex line, and a shallow flank to the other side of the apex line. The apex line is concave toward the other side.

Abstract: A holder assembly for a chip-removal tool insert has a holder member formed with two clamping jaws which are spaced apart and form an elongated slot there between, the slot is provided with an enlarged opening formed between curved surfaces on opposite inner faces of the jaws, the opening receives an expansion key rotatable in the slot for a further displacement of the jaws from each other during insertion of the chip removal tool in the slot.

Abstract: A cutting insert has a flat body (2) and at least one supporting surface (3) and a cutting edge (4, 5), to which are associated at least one first face (7, 8) and a flank (9, 10). In order to increase the volume of metal removed, at least one chipping bulge (11) is arranged on the first face (7, 8).

Abstract: The invention relates to a cutting insert (100; 200) for material-removing machining, especially turning, grinding, engraving and boring a workpiece (36), the at least one-sided overlap of which forms the first face (28) with at least one cutting edge (26) and the surrounding side surfaces of which form at least one free face (29). To improve cutting effectiveness, the flank (29) has one or more recesses (32) at a distance (h.sub.1) from the cutting edge (26; 34).

Abstract: A cutting insert for material-removing machining is formed with at least one generally straight cutting edge and a central flat plateau spaced backward from and at a predetermined height above the cutting edge. A plurality of elongated ridge-like chip-forming elements each extend along a respective longitudinal axis forming a respective acute angle to a respective perpendicular to the cutting edge from a leading end spaced backward from the cutting edge to a trailing end at the plateau and are each formed of a row of discrete bumps defining a contour line having adjacent the rear end a rear portion of a maximum height at least equal to that of the plateau, forward therefrom a front portion of a minimum height, and a rising intermediate portion having a length equal to at least half a length of the respective element.

Abstract: A metal removing tool, in particular lancing insert, has a holder (10) with a slot-shaped recess (11) and a cutting insert (12) detachably held therein under a prestress by means of an elastically expandable clamping arm (101) designed as one side of the recess (11). The opposite cooperating insertion and bearing surfaces of the cutting insert (12) and slot-shaped recess (11) have a V-shaped cross-section. At its insertion and bearing surface facing the clamping arm (101), the cutting insert has a plurality of substantially flat partial surfaces (124, 125, 126) arranged behind each other in the insertion direction. Two surfaces enclose an obtuse angle .alpha. and form a salient point at the ridge (127), so that the clamping arm (101) engages the cutting insert (12) between the ridge (127) and the cutting edge (121) in the clamping state.

Abstract: A cutting insert is formed with a plurality of cutting edges, a cutting surface spaced inward from the cutting edges, and a continuous land having an outer periphery at the cutting edges and a curved inner periphery spaced inward therefrom and outwardly delimiting the cutting surface. The land dips at the inner periphery generally centrally of each edge toward the surface and thereby forms generally centrally of each edge at the inner periphery a region of minimal height above the surface.

Abstract: A cutting insert for material-removing machining is formed with at least one transversely extending cutting edge, a transversely extending inner groove extending along and generally the full length of the cutting edge and having an outer edge and an inner edge spaced longitudinally from the outer edge and lying between the outer edge and the cutting edge, and an outer transversely extending groove extending along and generally the full length of the cutting edge and having an outer edge and an inner edge spaced longitudinally from the respective outer edge. The inner groove lies between the outer groove and the land. A transversely extending land surface extends immediately adjacent the cutting edge along the cutting edge between the inner groove and the cutting edge. A row of transversely spaced outer chip-forming elements lie wholly between the outer-groove outer edge and the inner-groove inner edge.

Abstract: A clamping device for connecting a toolhead and a toolholder on machine tools using a cylindrical or at least partly conical location hole with corresponding shank, wherein a rotatable clamping bolt with spiral guides is used, in clamping to move clamping members outwards from within, thus providing a positive and non-positive locking of the toolhead and the toolholder. The clamping bolt has at least one stop to limit the angle of rotation in clamping. The retainer for the clamping members is spring mounted in the toolholder.

Abstract: A process of forming a tool in which directly on the surface of the base body of the tool by base plasma activated chemical deposition a first PCVD layer of titanium carbide, titanium carbonitride, titanium nitride, zirconium carbonitride, and aluminum oxide is formed. Directly on this first layer by a nonplasma-activated CVD a second layer of titanium carbide, titanium carbonitride, titanium nitride, zirconium carbonitride, and aluminum oxide is formed. The steps are repeated to build up a coating so that it consists of a multiplicity of layers in a PCVD-CVD-PCVD-CVD structure.

Abstract: The invention relates to a cutting insert for chip-forming machining, in particular for roughing of metallic work-pieces with a high feed speed. To increase the chip movement during cutting it is suggested that indentations (14) be provided in the region of a cutting edge (12) which are arranged in a row extending along the cutting edge (12), which interrupt same and which have a generally trapezoidal sectional shape parallel to the cutting edge (12) and perpendicular to the chip surface (10) with trapezoidal sides open toward the chip surface, the indentations having a chip-surface base extending at a negative or 0.degree. chip angle (19) to the cutting edge (12), the chip surface (16) in the region between the indentations (14) at the cutting edge (12) has a positive chip angle (17).

Abstract: In order to improve the toughness characteristics of a cermet alloy, while retaining high resistance to wear, a composition is disclosed which contains 30 to 60% by weight of Ti, 5 to 20% by weight of W, 5 to 15% by weight of Ta, in which up to 70% of the Ta can be replaced by Nb, and 5 to 25% by weight of Ni and/or Co binder with more than 80 mole %, relative to the above transition elements of carbon and nitrogen. The composition is prepared by grinding, compressing and sintering a solid, powder-form mixture containing (Ti,W,Ta,Nb)C powder, Ti(C,N) powder, and WC powder, each powder having a particle size <1.5 .mu.m, plus Ni powder and/or Co powder. The mixture includes the following ingredients: (a) (Ti,W,Ta,Nb)C with a mean particle size <1.5 .mu.m, this mixed carbide containing 20 to 50% by weight of TiC, 20 to 40% by weight of WC, and 20 to 40% by weight of (Ta, Nb)C; (b) Ti(C,N), with a mean particle size <1.5 .mu.m and an N/(C+N) ratio <0.7; WC with a mean particle size <1.5 .mu.

Abstract: The invention relates to a cutting insert (10) for material-removing machining, especially for milling, turning or punching, with at least one cutting edge (12) and at least one chamfer (15) into which project depressions, or recesses (17) adjacent at a distance from the cutting edge and narrow them locally. To permit a very soft cut, stabilise the cutting edge (12) and attain high feeds, them are additional depressions (13) or recesses parallel to the depressions extending to the cutting edge and/or interrupting it for further narrowing the chamfer sections.