Abstract: A rotatable cutting tool for chip-removing machining includes a basic body which defines a center axis of rotation. Cutting inserts are detachably mounted in respective cutting seats that are formed in the basic body. Each insert has a square shape and includes first and second pairs of mutually parallel major cutting edges, four corners, and four wiper edges. Each wiper edge is situated between a major cutting edge and a respective corner. The wiper edges are shorter than the major cutting edges and are inclined relative thereto, wherein an imaginary extension line of the wiper edge forms a first acute angle with the respective major cutting edge as the insert is viewed in a direction perpendicular to the top surface. The cutting seats are arranged to orient the inserts wherein an axially forwardmost wiper edge of each insert lies in a plane oriented perpendicular to the axis, and wherein a radially outermost wiper edge of each insert is oriented parallel to the axis.

Abstract: A machine spindle includes a rotatable casing in which a clamping device is mounted. The clamping device includes a drawbar for securing a cutting tool. The drawbar is axially displaced by a gas spring which includes a chamber in which a lubricant-containing gas medium is confined. A piston includes a head slidable within a cylindrical upper portion of the chamber, and a rod extending through a lower portion of the chamber and connected to the drawbar. The lower portion of the chamber is non-cylindrical and widens upwardly to promote the upward travel of lubricant toward the piston and upper seals under the effects of centrifugal force during rotation of the spindle.

Abstract: A method and an apparatus for determining the position of a mining machine as its wheels skid with respect to the underlying surface. In the method, at least one detector detecting the operation of transmission detects skidding of at least one wheel with respect to the underlying surface, whereupon determination of the position by means of the rotation of the wheels and the direction of travel is interrupted. The apparatus includes at least one detector for detecting the operation of the transmission, the detector detecting the skidding of at least one wheel with respect to the underlying surface.

Abstract: The present invention relates to a method of milling a material comprising aluminum and cast iron. By using a silicon nitride based cutting tool insert at a cutting speed of more than 1000 m/min, an unexpected increase in tool life has been obtained.

Abstract: The drilling and bolting head (7) of compact structure, is designed for use in mine galleries of small height. It comprises: a transverse table (8) connected to the carrying vehicle, preferably with means (9 to 12) for lifting this table (8); a slide (13) displaceable along the table (8); an intermediate support (16) displaceable vertically on the slide (13); a vertical beam (21) mounted pivotally on the intermediate support (16); a vertical slideway (23) guided vertically on the beam (21); a drill (26), with means (33, 34) for the drilling and setting of bolts, which is guided vertically on the slideway (23); motorized means (14, 18, 30) for controlling the various movements. The intermediate support (16) possesses an upper part (20) which can be used as a prop, in combination with a jack (18) arranged along the vertical pivot axis (19) of the beam (21).

Abstract: A blast-hole drilling rig includes a carriage, a mast disposed on the carriage, and a rotary head mounted on the mast for up-and-down movement. The rotary head includes: a housing forming an internal chamber, a hydraulically driven motor, and a rotation transmission mechanism disposed in the chamber. The rotation transmission mechanism includes a gear system having a high-speed power input section operably connected to the motor, and a low-speed power output section adapted for connection to a drill pipe. The rotation transmission mechanism includes an anti-vibrational inertial body forming part of the high-speed power input section for storing rotational energy to even-out rotary speed variations and resist the generation of vibrations during operation. The inertial body includes a downwardly open recess in which the motor casing extends, wherein the motor projects downwardly past a bottom wall of the housing.

Abstract: A tool for chip removing machining includes a holder and a tool head removably attached to the holder by screws. The head, which carries at least one cutting insert, has a serrated surface mated with a serrated surface of the holder. Those serrated surfaces define an interface between the holder and the head which is oriented at a 45 degree angle with respect to a basal plane extending through the holder and containing a longitudinal axis thereof.

Abstract: A product resistant or immune to carburization, metal dusting, coking, oxidation, and having sufficient mechanical strength for use at temperatures greater than 400° C. The product consists of a load-bearing member and a corrosion resistant member, wherein the corrosion resistant member is a Cu—Al-alloy comprising Si. The product can be used in CO-containing atmospheres, and/or hydrocarbon containing atmospheres or solid carbon containing processes. A method of resisting carburization, metal dusting, coking and oxidation is also disclosed.

Abstract: A copper-base alloy with increased melting point above 1000° C., which is resistant or immune to carburization, metal dusting and coking, resistant to oxidation at elevated temperatures. The alloy has the following composition (in weight-%): Al 4-15, Si 0.1-6, Mo 0.5-40, W 0-40, where the total of Mo and W do not exceed 40%, one or more of the group of Rare Earth Metals (REM), such as yttrium, hafnium, zirconium, lanthanum and/or cerium, up to 1.0 weight-% of each element or a total of maximum 3.0 weight-%, Cu balance and normally occurring alloying additions and impurities. A method for the alloy's production, and the alloy's use as construction components in CO-containing atmospheres, ammonia containing atmospheres, and/or hydrocarbon containing atmospheres or solid carbon containing processes, are also disclosed.

Abstract: A method for controlling the operating cycle of an impact device, and an impact device. Percussion piston position is measured using a sensor (11) from which the measurement data is transmitted to a control unit (12) of the impact device, which in turn controls an electrically driven control valve (10).

Abstract: A cemented carbide with excellent properties for oil and gas applications regarding resistance to the combined erosion and corrosion synergistic effects at temperatures between ?50 and 300° C. and toughness. This object has been achieved with a cemented carbide containing, in weight %, 8-12 Co+Ni with a weight ratio Co/Ni of 0.25-4, 1-2 Cr and 0.1-0.3 Mo wherein essentially all of the WC grains have a size <1 ?m and with a magnetic cobalt content between 80 and 90% of that chemically determined.

Abstract: A toolholder and insert arrangement includes an insert having a cutting portion and a shank portion disposed at a base of the cutting portion. The toolholder has a first end attachable to a spindle and a second end having a shank-receiving opening. When the toolholder is at ordinary room temperature, the shank-receiving opening is smaller than the shank portion. Upon heating of the toolholder to a predetermined temperature above the ordinary room temperature and above an ordinary operating temperature, the shank-receiving opening expands to become at least as large as the shank portion. Upon cooling of the toolholder to a temperature below the predetermined temperature and after insertion of the shank portion in the shank-receiving opening, the shank-receiving opening shrinks to generally conform to a shape of the shank portion.

Abstract: A coated steel strip product with a dense and hard abrasion resistant coating on one side or both sides of said strip. The thickness of said coating is in total maximally 25 ?m, the hardness of said coating is at least 600 HV and the tensile strength of the steel strip substrate is at least 1200 MPa. The coating is preferably applied by electron beam evaporation and the coating may be, e.g., of Al2O3. The coated metal strip is useful for the manufacturing of doctor and coater blades for paper and printing industry.

Abstract: A coated steel strip product with a dense and hard abrasion resistant coating on one side or both sides of said strip substrate is provided. The thickness of said coating is in total maximally 25 ?m, the hardness of said coating is at least 600 HV and the tensile strength of the steel strip substrate is at least 1200 MPa. The coating is preferably applied by electron beam evaporation and the coating may be, e.g., of Al2O3. The coated metal strip is suitable for shaving equipment, medical instruments, utility and industrial knives as well as saw applications.

Abstract: A coated cutting tool is composed of one or more layers of refractory compounds of which at least one layer is single-phase ?-alumina with a pronounced columnar grain-structure and strong texture in the [300]-direction. The alumina layer is preferably deposited by CVD (Chemical Vapor Deposition) and the preferred microstructure and texture are achieved by adding a second metal halide, and a texture modifying agent, to the reaction gas. When coated cemented carbide cutting tools according to the invention are used in the machining of steel or cast iron, several important improvements compared to prior art have been observed, particularly in the machining of nodular cast iron.

Abstract: A rock drill includes a housing in which are disposed a reciprocable percussive device, slidably mounted in the housing, a rotary device, and a shank adapter aligned with the percussive device. The shank adapter includes first and second adapter portions. The first adapter portion has a front end and a rear end, the rear end arranged to be impacted by the percussive device and rotated by the rotary device. The second adapter portion has a rear end releasably connected to the front end of the first adapter portion, and a front end carrying a coupling adapted for connection with a drill rod component.

Abstract: A tool holder is held in a support body by a clamp which is wedged between the support body and the tool holder. The clamp is secured in the support body by a threaded fastener that extends through a through-hole formed in the clamp. The fastener carries a flange which pulls the clamp out of wedging relationship when the fastener is unscrewed. A spring disposed in the through-hole functions to keep the clamp pressed against the tool holder even after the clamp has been loosened, in order to keep the tool holder from falling out of the support body. A stopper is disposed behind the tool holder to locate the tool holder in a desired cutting position and to keep the tool holder pressed against an abutment surface of the support body.

Abstract: A cemented carbide with excellent properties for oil and gas applications regarding resistance to the combined erosion and corrosion synergistic effects at temperatures between ?50 and 300° C. and toughness. This object has been achieved with a cemented carbide containing, in weight %, 8-12 Co+Ni with a weight ratio Co/Ni of 0.25-4, 1-2 Cr and 0.1-0.3 Mo wherein essentially all of the WC grains have a size <1 ?m and with a magnetic cobalt content between 80 and 90% of that chemically determined.

Abstract: A screw-tap includes at least two cutting lands with respective cutting edges. The cutting edges have, at least in a starting taper region thereof, a chamfer with a negative angle that reduces a rake angle of the cutting edges. An angle of the chamfer to a plane oriented perpendicular to a surface produced in a workpiece has a value in a range of ?10° and ?60°. A width of the chamfer is between 0.05 and 0.75 times a depth of profile.

Abstract: A drill bit for the working of metal has a center pilot tip that transforms into straight cutting edges extending towards the outer periphery of the bit. Each cutting edge forms a cutting angle of 1-20° with a reference plane oriented perpendicular to of the drill axis. Each a cutting edge is inclined in a radially inward and axially rearward direction toward the drill axis. The center tip forms a pilot point angle of 90±2° and a has base that takes up 23-45 percent of the total diameter of the cutting section of the drill bit. The tip has a tip angle of 90±10°.