Abstract: A method for the manufacture of objects from powdered material by isostatic or pseudo-isostatic pressing. A porous body (10), with open pores in contact with the external surface(s), is preformed from a powdered material, whereupon at least one layer (11, 12) of a powdered material is applied onto the external surface of the preformed porous body by dipping. The preformed porous body is covered with a casing (13) of glass, or a material which forms glass upon heating, arranged outside the intermediate layer (12). The casing is made impenetrable to the pressure medium by heating, whereupon the preformed body is compacted to an essentially dense body. The pore system of the preformed porous body is evacuated by applying a sub-atmospheric pressure by means of at least one suction cup (21) which is applied on the external surface to be coated in connection with and during the dipping of the body in a slurry (20) of powdered materials included in the layer (11, 12).

Abstract: A down-the-hole drill tool comprises a one-piece shaft and pilot bit. The shaft is adapted for connection to a down-the-hole hammer. A reamer and a guide body are detachably mounted to the one-piece shaft/pilot bit. The guide body has a downwardly facing shoulder for pushing a casing tube downwardly along with the tool.

Abstract: The present invention relates to cemented carbide bodies preferably for rock drilling and mineral cutting. Due to the fact that the bodies are built up of a core of eta-phase-containing cemented carbide surrounded by a surface zone free of eta-phase with low Co-content in the surface zone and successively increasing Co-content to a maximum in the outer part of the eta-phase-core they have obtained an increase in toughness and life at practical use.

Abstract: A tool is positioned relative to a clamping unit by gripping the tool with a gripping device and moving the gripping device to position the tool in a socket of the clamping unit. Simultaneously, a motor-powered drive wheel, which is mounted on the gripping device, becomes meshed with a wheel of the clamping unit. The driven wheel is rotated and causes tool to be moved axially into a tightly clamped position within the socket. The gripping device is movable in radial and axial directions and is capable of removing the tool from the clamping unit and transporting the tool to and from a magazine.

Abstract: A cutting body is formed of compacted powder and has a lower side provided with a recess and a spaced protrusion. The body can be used as a cutting insert, or two identical such bodies can be sintered together to form an invertible cutting insert. Voids can be formed within the insert to contain sensors or conduct cooling fluid.

Abstract: A parting or grooving tool includes a narrow support blade and a cutting insert removably securable in a recess formed by upper and lower jaws at the front portion of the blade. The inert is clamped into place by an actuator which engages in a slot that extends at an angle in relation to the longitudinal axis of the recess such that the lower jaw is subjected to an elastic bending of such nature that a downwardly directed clamping force is exerted towards the upper surface of the cutting insert.

Abstract: The present invention relates to buttons, inserts and bodies for rock drilling, rock cutting, metal cutting and wear part applications. The buttons, inserts and bodies comprise cemented carbide provided with bodies and/or layers of CVD- or PVD-fabricated diamond and then HP/HT treated in the diamond stable area. The bodies of cemented carbide may have a uniform structure or a multi-structure containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase.

Abstract: A tool for bar peeling of solid or hollow bars includes a rotatable cutter head and a plurality of toolholders distributed around its periphery. Each toolholder is provided with a roughing insert and a finishing insert. The edge surface of each roughing insert intersect with the top surface to define three separate cutting edges whereby adjacent pair of these edges intersect at obtuse angles ranging from 120-140 degrees. The cutting edges of the roughing insert are convexly curved, whereas the cutting edges of the finishing insert are basically linear.

Abstract: The properties of silicon carbide whisker reinforced aluminum oxide, at present used for cutting tools when machining nickel based alloys, are in a very complex way related to processing and microstructure. Important parameters that have been recognized include whisker/platelet distribution, diameter, aspect ratio, surface chemistry and surface morphology. One parameter that has not been discussed is the crystal structure of the silicon carbide phase. Silicon carbide exist in a number of different polytypes, the most common with cubic or hexagonal structure. Available commercial silicon carbide contains mixed hexagonal and cubic silicon carbide-phases or single phase cubic. During sintering it is possible to transform cubic to hexagonal phase by special processing. It is shown that the hexagonal to cubic ratio strongly affects the performance in metal cutting operations and especially toughness behavior is related to a high hexagonal to cubic ratio.

Abstract: A bandsaw blade comprises a plurality of cutting teeth spaced longitudinally apart by gullets. Each tooth includes a steel portion and a carbide tip brazed to a front face of the steel portion. The deepest point of the gullet lies on a curved section having a relatively large radius of curvature, and is spaced longitudinally forwardly of the trailing carbide tip by a relatively large distance. Transversely spaced corners of the gullet bottom are made smoothly rounded by a shot-peening operation.

Abstract: A roll, comprising cemented carbide and cast iron. The roll may be used for hot or cold rolling. The barrel comprises one or several cemented carbide rings, cast by centrifugal casting method into a roll body of an iron alloy. The casting alloy comprises an essentially graphitic cast iron, which after the casting contains residual austenite. This residual austenite is transformed at subsequent heat treatment step (or steps) totally or partly to mainly bainite under volume increase, with the aim of reducing or totally eliminating the differential shrinkage between the cast iron and the cemented carbide as a result from cooling after the casting. The central part of the roll body may alternatively consist of another alloy.

Abstract: A multi-cornered cutting insert includes a corner cutting edge at each corner, and a chipbreaking recess spaced inwardly of each corner cutting edge. The recess is curved as the insert is viewed in plan. A clearance face for each corner cutting edge has a clearance angle which progressively increases toward the respective corner.

Abstract: Filing gauge for sharpening of a saw chain with cutter (13) and depth gauge (14), comprising a housing (21) which can be located on the saw chain in two angular positions, two parallel shafts (26,27) fixed to the housing, two rollers (28,29) with guiding grooves for a round file slidingly journalled on the shafts, a roller follower (30) slidingly journalled on the shafts without angular mobility and permitting only parallel and simultaneous motion of the rollers, and a guide plate (40) for filing the depth gauge swingably affixed to the housing.

Abstract: There is provided a cemented carbide tool for punching, cutting or nibbling containing WC and a binder comprising at least one of the metals Co, Ni and Fe. The tool comprises a core of eta-phase-containing cemented carbide surrounded by an eta-phase-free surface zone with the working surface of the tool comprising exposed eta-phase-containing cemented carbide.

Abstract: The present invention relates to a ceramic whisker-containing cutting insert for chipforming machining of steel having improved mechanical, thermal and wearing properties.Besides an oxide-based matrix, the material contains 5-50, preferably 10-40, % by volume of homogeneously distributed whiskers or platelets of nitrides, carbides and/or borides of metals from group IVB (Ti, Zr or Hf) and/or VB (V, Nb or Ta) in the periodic system (or solid solutions thereof) having a linear expansion coefficient being lower than that of Al.sub.2 O.sub.3, preferably at the most 85% of that for Al.sub.2 O.sub.3 measured at 300-1300K. The properties of the composite material can be further modified by coating the whisker material with thin layers. The whisker reinforced cutting tool material shows an improved toughness behavior.

Abstract: The present invention relates to artificial onlay tooth crowns or inlays composed of a prefabricated core designed for preparations for onlay tooth crowns or inlays in natural teeth. The core is preferably fabricated from a high strength densely sintered ceramic material by copy milling from a negative reproduction from the prepared cavity to a compacted body or a presintered ceramic material. During the copy milling, the sintering shrinkage is considered by enlargement of the copy milled compacted body or the presintered body corresponding to the sintering shrinkage. The onlay tooth crowns and inlays are given the final shape by shaping the surfaces outside the cavity of the compacted or the presintered body. After the final sintering, the external surface can be shaped and a veneer material attached to the external surface of the core by, e.g., firing of dental porcelain.

Abstract: The present invention relates to a rock bit insert of cemented carbide for cutting rock drilling. The insert is provided with one or more bodies or layers of diamond or cBN produced at high pressure and high temperature in the diamond or cBN stable area.The body of cemented carbide has a multi-structure 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.