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 composite body includes 5 to 40% by mass of SiC whiskers and/or up to 80% by mass SiC lamellae and/or of up to 75% by mass SiC powder, 0.05 to 3% by mass of at least one component selected from the group of Y.sub.2 O.sub.3, SiO.sub.3, MgO, NiO and AlN and/or up to 40% by mass of at least one compound selected from the group of carbides, nitrides or carbonitrides of a metal from one of the Groups IVa, Va, Via of the Periodic Table of elements, and/or up to 40% by mass of at least one oxide of at least one metal selected from the group which consists of the metals of Group IVa of the Periodic Table of elements, 0.

Abstract: The invention relates to a hard-metal body whose hard-metal phase consist of tungsten carbide and whose binder metal phase consists of nickel and chrome.Especially for the enhancement of the corrosion resistance it is proposed that the hard metal contain also TiN in addition to the hard-metal phase, whereby the content of TiN and and binder metal phase amounts to 5 to 25% by mass and is composed by 0.1 to 10% by mass TiN, 5 to 15% by mass chrome, the balance being made up by nickel.

Abstract: The invention relates to a composite hard metal body of hard material, a binder and embedded reinforcing material, as well as to a process for the production of the composite hard metal body by methods of powder metallurgy.In order to create a composite hard metal body with improved toughness under load, improved hardness and a lower fracture susceptibility, the invention proposes to build in monocrystalline, preferably needle-shaped and/or platelet-shaped reinforcing materials, coated with an inert layer with respect to the binder metal phase and consisting of borides and/or carbides, and/or nitrides and/or carbonitrides of the elements of Groups IVa or Va or mixtures thereof and/or coated monocrystalline reinforcing material of SiC, Si.sub.3 N.sub.4, Si.sub.2 N.sub.2 O, Al.sub.2 O.sub.3, ZrO.sub.2, AlN and/or BN.

Abstract: A process for coating a basic metallic substrate with a non-metallic coating layer with a plasma-activated CVD deposition generated by applying a pulsed DC voltage between the substrate and another electrode and by maintaining a potential of residual DC voltage between pulses of the applied voltage.

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 sintered hard metal body having improved heat resistance and higher cutting performance is produced by a process including mixing together at least one hard substance, at least one binder material, and at least one of at least one complex carbide and at least one complex nitride to form a starting mixture each constituent of which is in powdered form. The at least one hard substance is selected from the group consisting of carbides, nitrides, and carbonitrides of transition metals of Groups IVB, VB and VIB of the Periodic Table of Elements, is present as at least one of a carbide, a mixed carbide, a nitride, a mixed nitride, a carbonitride, and a mixed carbonitride, and has a cubic crystal form. The at least one binder metal is selected from the group including iron, nickel and cobalt.

Abstract: An extrusion molding tool for the production of a drill blank made of a plastic raw material by extruding the material in a longitudinal extrusion direction across a production mandrel and through a bore in a die, the bore having a longtiudinal axis, the mandrel having at least one elastically deformable wire radially spaced from the longitudinal axis projecting into an intake end of the bore for forming at least one internal helical rinsing bore in the drill blank, wherein the die includes a plurality of annular discs disposed one behind the next in the longitudinal direction. The discs have respective interior surfaces surrounding the longitudinal axis and together define the bore. The interior surfaces have ribs which when properly aligned together form a helical radially inwardly projecting ridge extending at a helix angle with respect to the longitudinal direction to define a means for twisting the raw material passing through the bore.

Abstract: A lock rod is provided extending along and reciprocally movable along an axis Y-Y and having a cylindrical cross section near one end. Two circumferentially spaced depressions are located in the cylindrical surface for receiving locking elements in an unlocked position. Extending from the first depression is a ramp inclined with respect to axis Y-Y and from the second depression is a groove parallel to axis Y-Y for driving locking elements radially outwardly to abut against a toolholder shank to lock it onto a tool support member.

Abstract: The present invention relates to an improved toolholder for releasably mounting on a tool support member. The toolholder is provided with a forward end for receiving a tool and a shank extending from the forward end for being releasably received in a bore of a tool support member. The shank has a first section for interference fitting with the bore of the tool support member when a rearwardly facing face on the toolholder is in abutment with a forwardly facing surface on the tool support member. The shank has a second section, rearwardly of its first section, for expansible abutment with the bore of the tool support member.

Abstract: In the present invention a tubular toolholder shank is releasably held in the bore of a tool support member by a releasable locking mechanism mounted in the bore of the tool support member and receivable in the tubular toolholder shank. The locking mechanism has an actuating member radially extending through the wall of the tubular shank.

Abstract: An apparatus for holding a tubular shank of a toolholder is provided with a tool support member bore for receiving the shank and first and second radially reciprocal movable clamping jaws for holding the shank in the bore. The movement of the clamping jaws is radially activated by rotation of a radially aligned differentially threaded member engaging both clamping jaws.

Abstract: A lock rod is provided extending along and reciprocally movable along an axis Y--Y and having a cylindrical cross section near one end. Two circumferentially spaced depressions are located in the cylindrical surface for receiving locking elements in an unlocked position. Extending from the first depression is a ramp inclined with respect to axis Y--Y and from the second depression is a groove parallel to axis Y--Y for driving locking elements radially outwardly to abut against a toolholder shank to lock it onto a tool support member.