Abstract: The invention relates to a drill element for percussion drilling, the element having a cylindrical screw thread having one single entry. The screw thread, that is intended for thread diameters of less than 30 mm, has a pitch of less than 12 mm, a shoulder angle of less than 69.degree., and a pitch angle of less than 11.degree. but more than 5.6.degree..

Abstract: The invention relates to an indexable cutting insert for recessing. The insert (10) has a triangular basic shape and comprises three cutting edges. Each cutting edge is arranged at a projection (16) which at least partly is asymmetrically arranged relative to a line parallel with the working direction (I) of the insert. The insert has a good accessibility at work pieces having narrow spaces.

Abstract: A drill steel for percussion drilling has four longitudinally extending grooves for removal of cuttings. The grooves are shaped such that, in comparison with a hexagonal drill steel, there is obtained an enlarged space for cuttings and a less consumption of material with maintenance of the same resistance to bending.

Abstract: A drill comprising a drill body (11) and a drill tip (22). The drill tip is detachably secured in a slot in the drill body. The drill tip (22) consists of a tip body and cutting portions. The drill body (11) and the tip body comprise cooperating surfaces in order to receive the radial and axial forces acting on the cutting portions.

Abstract: The present invention relates to cemented carbide bodies preferably for rock drilling and mineral cutting. By having the bodies comprising a core of cemented carbide containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase and having a low content of cobalt in the surface and a higher content of cobalt next to the eta-phase zone the bodies have obtained an increased strength and life in practical use.

Abstract: A device for supplying fluid at a socket for axial not displaceably mounted tools for breaking of solid material, fluid is arranged to be supplied to a nozzle adjacent to the tool when a working tool is subjected to a counteracting force.

Abstract: The present invention relates to a compound body consisting of a substrate with a surface coating of one or more dense, finegrained diamond layers, where the diamond grains are directly bonded to each other. Extreme hardness makes the compound body suitable for wear parts- and tools applications. Very good heat conductivity and an extremely high electrical isolation resistance makes the compound body extremely useful to lead away heat in electronic components.

Abstract: The present invention relates to a tool coupling device comprising a coupling element (10) attachable to a machine tool and a tool adapter (11) intended to clamp a tool for chip forming machining. A plug (18) on the adapter (11) is related to a contact surface (30;38) that is intended to be in engagement with a corresponding contact surface (29;37) related to the coupling element (10), said engagement clamping the adapter (11) against the coupling element (10).

Abstract: The invention relates to a tool preferably for turning, and an insert therefor. The tool comprises a shank (11) upon which a loop-shaped outer disc (12) is secured. An inner disc (13) is displaceably arranged between the arms of the outer disc (12). A screw (15) is arranged to push the inner disc (13) forwards relative to the outer disc during inward screwing, such that the fore ends of the inner disc force the lower face of the insert against the upper face of the shank (11). The insert (14) is provided with a hole which is arranged to be wedged up on a pin (36) extending in the hole during a forward movement of the insert at the same time as the pin and the hole comprise cooperating surfaces to force the lower face of the insert against the upper face of the shank.

Abstract: The invention relates to a drill for generating of holes in a work piece, preferably in a composite material. The drill comprises a cylindrical shank portion, two cutting portions projecting in the axial and radial direction of the drill and two chip gullets. The cutting portions are arranged symmetrically about the center axis of the drill and each comprising a cutting tip, a minor cutting edge and a free-cutting edge. The cutting portions are shaped such that they require a small feed force in order to drill in the work piece.

Abstract: A chemical vapor deposition method for the production of a composite body with one or more polycrystalline diamond layers, essentially free of intercrystalline binder phase, on a substrate of one of: (a) metalbonded hardmaterial compound; (b) ceramic material; or (c) a metal or an alloy, whereby the heated substrate is contacted with a gaseous mixture of hydrocarbon or hydrogen, which mixture has been activated by passing it over a tantalum heater heated to a temperature of 1500.degree.-2500.degree. C.Also disclosed is the use of the compound body in tools subjected to mechanical operations.

Abstract: The invention relates to a device for supplying fluid to a tool for breaking solid material, said tool being mounted in a holder, and that a nozzle is arranged in or in connection to the tool. A connection element for fluid transmission is arranged to bridge the opposing contact surfaces on the holder and the machine part in such a way that fluid is prevented to enter between said contact surfaces.

Abstract: A method of producing coolant channels in a metallic object such as a cutting tool whereby a blank is formed by at least one working step such as compaction etc. and the channels are formed by cores whereby the working takes place as a compaction at a temperature of at least 950.degree. C. and that the core thereafter is removed in a separate step.

Abstract: A cutting tool, a drill for instance, having a drill body and a cutting portion. The cutting portion comprises a central cutting insert and two peripheral cutting inserts. A cutting edge extends along the three inserts. The inserts comprise surfaces for facilitating a tight connection between the parts of the cutting edge. The peripheral inserts consist of a material of greater hardness than the material in the central insert, and therefore the cutting edge is adapted for the varying cutting speeds in the radial direction of the tool.

Abstract: A thread structure for interconnecting two elements in a percussion drill string comprising an interior cylindrical thread and an exterior cylindrical thread. The threads have abutting flanks which are straight along their abutting contact portions. The clearance (a) between the bottom portion of the exterior thread and the crest portion of the interior thread is large enough to ensure that contact does not arise at said clearance when the threads are worn.

Abstract: The invention relates to a drill for metal drilling, comprising a drill body and a drill tip provided with cutting portions. The drill tip is detachably secured to the drill body by means of fastening devices, which are arranged on opposite sides of the centerline (CL) of the drill. The planar lower face of the drill tip is provided with a central tap which engages in a central recess in the mainly planar front surface of the drill body in order to center the drill tip relative to the drill body. A central fluid passage is formed in the drill body, which transforms into eccentrically arranged fluid passages in the drill tip. The fastening devices form at least partly walls in the eccentrical fluid passages.

Abstract: The invention relates to an insert, preferably for turning. The insert, which has a triangular basic shape, has three chip breakers in its upper flat face. A cutting edge is formed at the intersection line between a chip breaker and an edge surface. The chip breaker is formed with a conical rake face inside an associated nose portion. The chip breaker consists of an outer part and an inner part. The inner part is mainly planar and its termination at the nose portion deviates from the general direction of the inner part in order to guide and control chips during finishing.

Abstract: The invention relates to an indexable cutting insert having a polygonal basic shape for chip forming machining, preferably for milling. The insert comprises an upper face and a lower face and edge surfaces connecting them. Each corner portion of the insert comprises a plurality of chamfers arranged at the transition between the connected edge surfaces, a first chamfer of which forms a minor cutting edge at the line of intersection with the upper face. At least two further planar, second chamfers are arranged between the first chamfer and the associated edge surface, said second chamfers forming an obtuseinternal angle with each other and forming cutting edges with the upper face and therefore the cut chip avoids compressing and avoids a quick destruction of the corner portions of the insert.

Abstract: A drill for drilling of work pieces, preferably of composite materials, comprising a cylindrical shank portion (11), a first cutting edge (13) in form of an arc of a circle arranged in the cutting end of the drill and a second cutting edge (16) perpendicularly connected thereto. The edges (13,16) are preceded in the rotational direction by a third cutting edge (14) which during the drilling cuts away the material radially inside a circular groove which is cut by the first and the second cutting edges (13,16).