Abstract: A boring tool is provided with first and second rectangular reversing cut plates which have, in each case, two short and two considerably longer cutting edges. One of the reversing cut plates is arranged connecting to or intersecting the axis of rotation of the boring tool, while the other reversing cut plate 12 is arranged connecting to the outer circle defined by the boring tool. The cutting edges active in each case on the face side of the boring tool have a straight construction and they overlap to a greater or lesser extend, in accordance with the bore diameter. The bend-free and jog-free construction of the active cutting edges of the cut plates makes possible the use of the same reversing cut plates on boring tools having different diameters with only the extent of the overlap of the cut plates being changed.

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 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 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 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: The invention relates to a modular tool system consisting of a tool holder (10) with a fitting for a cutting insert holder (11) which, when released, is radially movable in relation to the tool holder by means of an adjusting screw (17) fitted in a threaded hole (16) in one of the holders and can be clamped with the tool holder by means of clamping screws (15). To provide an alternative radial adjustment of the tools or centred fitting without facilities for readjustment without a great deal of effort, the stop is a pin (18, 30) releasably securable in the holder, whereby at least one diameter of the pin is the same as that of the pin recess in the other holder and the blind hole in the first holder (20, 29), into which the projecting end of the pin enters and the hold for the adjusting screw opens perpendicularly thereto.

Abstract: A drill having at least one and generally at least two cutting inserts fixed in a cutting end of the drill and in which each cutting insert is a polygonal body having at least three cutting vertices and respective cutting edges between the vertices which are set back so that cutting points are formed close to a vertex. The partial cutting edges formed by the setback extend rectilinearly to the cutting points and include an angle of up to 170.degree. between them.

Abstract: A drilling tool for drilling bores in solid metal, with a shank having at its front end several geometrically similar indexable inserts arranged at various radial distances and staggered with respect to each other by the same peripheral angle, whose working areas overlap, each of them having two equally long cutting edges, two of the respectively contiguous cutting edges inclined with respect to each other at an obtuse angle being simultaneously engaged, whereby the radial inner indexable insert extends slightly with one of its engaged cutting edges beyond the drill axis, at least one of the bisectors of the two pair set cutting edges of indexable inserts being inclined with respect to the longitudinal shank axis by an angle up to 25.degree. m and at least one of the bisectors running at an angle differing from zero with respect to another bisector, so that the sum total differing from zero of the radial force component (F.sub.

Abstract: A machine tool turret having a plurality of tool holders with tension rod-actuated mechanisms for locking the tool head can be rotated to bring a selected tool holder into engagement with jaws of a release unit, applying to the tension rod a force sufficient to compress the disk spring stack thereof and release the tool and to the holder a counterforce which is equal and opposite in direction and prevents the release unit from stressing the bearings of the turret or any spindle bearings which may make the tool holder rotatable.

Abstract: A tool head is clamped in a tool holder by rotating a radial or axial clamping shaft which has spiral camming surfaces urging clamping elements outwardly to engage ramps on the pin of the tool head which is received in a socket of the tool holder. The spiral cam can be a second or higher order mathematical curve and the shaft can carry an ejection cam as well.

Abstract: A machine spindle is formed with an axially centered forwardly flared large-diameter seat, provided in the seat with at least two axially and radially displaceable spindle jaws, having an axially displaceable actuating rod axially coupled with the jaws, and formed with cam formations engageable with the jaws to move same together on axial rearward displacement. A transfer body or a tool is normally also centered on the axis and formed with an axially centered rearwardly tapered small-diameter stem substantially smaller than the seat.

Abstract: A tool holder system for stationary or rotatable tool holders in machine tools with manual or automatic tool change, has a tool holder provided with a mechanism for locking the tool head onto clamping surfaces, and integrated liquid coolant supply and a compressed air supply to the clamping surfaces. At the clamping end of the tool holder, a checkvalve is provided in the air supply passage to block incursion of liquid coolant even at high pressures of the latter and thus prevent corrosion and damage which may result from such corrosion.

Abstract: A tool coupling for connecting a tool head to a tool holder to secure the tool head against rotation and provide axial prestress. The tool head, which serves as a cutting tool, includes a shank having at least a portion which is conically configured, a threaded bore, and an annular contact collar. The tool holder includes a sleeve-shaped receiving bore corresponding to the shank, at least a portion of the receiving bore being conically configured, a tightening screw, and an annular contact face. An additional bore in the shank of the tool head ensures a prestress between the shank and the tool carrier including the receiving bore, and such prestress is not entirely relieved even if lateral forces act on the tool head. This keeps the tool head from vibrating in the receiving bore.

Abstract: A tool-and-tool holder assembly includes a tool having a tool shank; a tool holder having a receiving bore arranged for accommodating a stub of the tool shank; a clamping member disposed in the stub and being movable therein, generally perpendicularly to the shank; and two clamping screws supported in the tool holder and cooperating with the clamping member for axially tightening the shank against the tool holder. Each clamping screw has a first conical face and the clamping member has recesses each bounded by a second conical face. Upon tightening the clamping screws, the respective first and second conical faces are pressed against one another for generating an axial force component urging the shank into the receiving bore. At least one of the clamping screws has a third conical face, and the clamping member has a portion projecting over one of the recesses and having a fourth conical face.

Abstract: A cutting bit (1) has a bottom side (2), flanks (3) that are inclined at a positive clearance angle (.alpha.) with respect to the bottom side (2), and a top side (7). The top side (7) has cutting edges (5 and 5') which are inclined with respect to one another at an angle of inclination (.lambda.). The cutting bit is made by sintering a blank which is formed using a pressing tool (10). The pressing tool includes a mold member (11), an upper die (12), and a lower die (13). The upper die (12) has a pressure face (20) which corresponds precisely, except for an allowance for the shrinkage ratio of the sinter material, to the actual surface of the upper side of the cutting bit (1). When the upper die (12) is fully inserted into the mold (11), a free space (31) exists between the upper die (12) and the mold member (11), the free space being disposed above the delimiting line (21) of pressure face (20) of the upper die (12).

Abstract: A rotationally symmetrical tool assembly includes a first component constituted by a tool holder; a second component constituted by a tool head and being removably attached to the first component such that engagement faces of the first and second components are in a contacting relationship with one another and are oriented perpendicularly to the rotary axis of the tool assembly. A fitting bore is provided in one of the components and a guide bore is provided in the other of the components. A securing pin projects from the fitting bore and extends into the guide bore for determining and maintaining a desired angular position of the second component relative to the first component.

Abstract: An apparatus for receiving a tool carrier comprises a tool holder defining a receiving bore adapted to receive a portion of the tool carrier, an arrangement for supplying pressurized fluid to the receiving bore of the tool holder to clean adjacent surfaces of the tool holder and the tool carrier during insertion of the tool carrier into the receiving bore; and an arrangement for detecting the pressure of the fluid supplied to the tool holder for ascertaining whether correct operational positioning of the tool carrier exists with respect to the tool holder.

Abstract: A tool changing device for tool systems in which a tool head and a tool holder are connected with one another by means of an automatic clamping mechanism which includes an integrated clamping screw. The tool changing device includes a lifting carriage which is movable on several axes and a rotatably mounted, motor driven pivot arm which is mounted on the lifting carriage. The pivot arm has a free end which is equipped with a gripper holder having at least four tool locations and an integrated clamping shaft. Both ends of the clamping shaft are provided with profiles which permit transfer of torques. The clamping shaft can be moved axially in such a manner that it can be coupled with the clamping screw of a tool holder either from the left or from the right.

Abstract: In a combination including a tool head and a tool holder of a machine tool, the tool head having a shank and an outwardly radially projecting contact collar carried by the shank and the tool holder being formed to have a receiving bore which provides a counterface disposed to cooperate with the contact collar, the combination further including clamping structure for locking the tool head to the tool holder with the contact collar bearing against a selected portion of the counterface, the contact collar and the selected portion of the counterface are cylindrical and, when the contact collar is out of engagement with the counterface, the contact collar has an outer diameter which is slightly greater than the diameter of the selected portion of the counterface for effecting secure clamping of the tool head to the tool holder.