Abstract: A method and a computer program for controlling a drilling cycle in a rock drilling apparatus, and a rock drilling apparatus. In accordance with the invention, each drilling unit in the rock drilling apparatus is monitored during a drilling period, and a drilling sequence of a control unit in the rock drilling apparatus is updated at predetermined intervals during the drilling period. The total time of the drilling and the time elapsed for different operations can be registered. In addition, according to an embodiment, the drilling sequence is changed during updating, if changes occur in the drilling conditions during the drilling period.

Abstract: A cutting tool for rotary cutting includes a rotatable basic body and a replaceable cutting part or loose top, which is connectable to the basic body via a male/female coupling, which includes a groove and a male part. The groove is formed in a front end of the basic body and is delimited by a bottom surface and two side surfaces. The male part is insertable into the groove along the axis of rotation and protrudes rearwardly from the loose top. The male part has an end surface and two flank surfaces. In the front part of the basic body a forwardly open slot is formed, which separates two elastically deflectable legs wich clamp the male part in the groove. In either the end surface or the bottom surface a recess is formed for receiving a projection on the other surface. The recess is larger than the projection in order to enable the male part to reciprocate a short distance in the groove, whereby the loose top is self-centering with respect to the axis of rotation.

Abstract: A vibrating screen for conducting material in a longitudinal direction while screening the material comprises a screening deck, exchangeable modular screening media, and an adapter arrangement for mounting the screening media on the deck. The screening deck includes transverse carriers oriented transversely of the longitudinal direction. The adapter arrangement comprises longitudinal support carriers arranged substantially in the longitudinal direction, and connecting elements oriented transversely of the longitudinal direction for interconnecting the support carriers and connecting the interconnected support carriers on the transverse carriers.

Abstract: A drill rod for percussive rock drilling includes a first rod part and an additional second rod part. The first rod part includes first and second ends, an inner duct, and an external thread disposed adjacent the first end, wherein the external thread is at least partly hardened by heat treatment. The additional rod part includes first and second ends, an inner duct, and an internally thread disposed adjacent the first end thereof, wherein the internal thread is at least partly hardened by heat treatment. The first ends of the respective first and second rod parts are threadedly secured to one another, and the second ends of the respective first and second rod parts are welded together to define a weld zone having a substantially martensitic structure. If there is further provided an intermediate hollow rod part, then the second ends of the respective first and second rod parts would be welded to respective ends of the intermediate hollow part to define weld zones having a substantially martensitic structure.

Abstract: A cutting pick includes an elongate shank, a cutting tip fixed to one end of the shank to project from that end and which is of a material that is harder than the material of the shank, and an annular sleeve which is attached about the shank adjacent the cutting tip. The sleeve is of a material (e.g., tungsten carbide) which is harder than the material of the shank and which has a lower propensity for incendive spark production during a cutting operation than the material of the shank. The sleeve includes a plurality of annular sleeve portions which are attached about the shank immediately adjacent to each other.

Abstract: The present invention relates to a cemented carbide body with the following composition: Co: 10-12 wt-%, TaC: <3 wt-%, NbC: 1-5.5 wt-%, TiC: 3-5 wt-% and as rest WC. The cemented carbide body is particularly useful for metal cutting operations requiring high wear resistance, high edge retention and high edge toughness.

Abstract: A tool intended for chip removing machining includes a holder and a cutting insert which have respective connecting surfaces arranged to engage each other and define an interface. A ridge having a tapering cross-sectional shape is formed in one of the connecting surfaces, and a groove having a tapering cross-sectional shape is formed in the other connecting surface, which groove receives the ridge. Both of the ridge and groove are in the shape of curves as viewed in a direction perpendicular to the respective connecting surface. The curve shape may be circular, elliptical, or polygonal.

Abstract: A drilling tool set includes a plurality of drilling tools having different operative drill diameters to blast drill holes of different respective diameters. Each drilling tool of the set has a basic body defining a central axis of rotation, and two replaceable indexable bits including a center bit and a periphery bit which are mountable in respective center and periphery pockets formed in a front end of the basic body. The periphery bits of the respective drill tools of the set are identical, and the center bits of the respective drill tools of the set are identical. Each of the center and periphery pockets of each drill tool defines a radial center point. A first of the drill tools has a smaller operative drill diameter than a second of the drill tools. The first tool includes a first periphery pocket and a center pocket. The center point of the first periphery pocket is disposed closer to the axis than is the center point of the second periphery pocket.

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 milling tool includes a milling body and a plurality of insert-carrying cartridges mounted in the milling body. Each cartridge includes front and rear side surfaces which oppose leading and trailing walls of a pocket formed in the milling body. The cartridge also includes inner and outer flank surfaces which interconnect the front and rear side surfaces. The body includes a slot which opens into the front side surface at a location intermediate the ends of the cartridge, to divide the body into a rigid base portion and an expandable portion. The base portion has a seat for a cutting insert. A threaded hole is formed in the slot intermediate the slot ends to receive a threaded wedge screw. Tightening of the screw causes the expandable portion to be expanded into contact with the leading wall of the pocket and thereby push the base portion into tight contact with the trailing wall of the pocket. Accordingly, the cartridge is secured within the pocket by a tight frictional contact which resists chatter.

Abstract: A rotatable cutting tool, e.g., a milling cutter, includes a rotatable base body and a cutting insert, which in addition to two opposite side surfaces has front and rear end surfaces. For axial fine-adjustment of the cutting insert, a set screw is arranged that is located in an area behind the cutting insert and inclined at an obtuse angle to a side surface of the cutting insert. During an unscrewing of the set screw, it presses against the rear end surface of the cutting insert with the purpose of moving the cutting insert in the direction axially forwards, whereby the screw, due to the obtuse angle, is centrifugally secured by means of the actual cutting insert.

Abstract: A cutting insert for milling cam shafts includes first and second surface interconnected by a third surface, and at least one cutting edge. The cutting edge includes a straight first cutting edge section, a straight second cutting edge section, and a generally convex third cutting edge section, all adjoining one another. The first section extends along the junction between the first and third surfaces. The second section extends along the junction and includes a first end adjoining an end of the first section. The second is inclined at an obtuse angle from one end of the first section in a direction away from the third surface. The third section extends along the junction and adjoins a second end of the second section. The third section is of generally convex shape and extends over an angular range greater than 90°. The first, second and third sections lie in the third surface.

Abstract: A method and an equipment for controlling the operation of a rock drilling apparatus, which rock drilling apparatus comprises a percussion device for producing impact energy to a tool of the rock drilling apparatus, a rotating device for rotating the tool in a drill hole, a feeding device for feeding the tool in the drill hole and a flushing device for supplying flushing agent through the tool and the bit for flushing loose drilling waste from the hole. The feed force and the percussion power are determined and the relation between the feed force and the percussion power is adjusted to a targeted operation area within an upper and a lower limit.

Abstract: A bit head retaining system includes a bit head having an upper end and a working face, and a retention sleeve adapted to be connected to an end of a drill casing and having an internal opening in which at least a portion of the bit head above the working face is disposed, the bit head being secured to the retention sleeve so as to be axially immovable relative to the retention sleeve. A method of installing a bit head in a percussion drill is also disclosed.

Abstract: A screening deck for the screening of crushed stone material includes a plurality of screening elements arranged adjacent one another. At least one side of each screening element is non-parallel with respect to a longitudinal direction of the screening deck. The screening deck includes at least two different types of screening elements which are arranged at different heights in the screening deck for creating narrowing passages and/or winding paths and/or steps for the material traveling on the screening deck.

Abstract: A method of controlling the concentration of nitrogen oxides, hydrocarbons, and carbon monoxide in waste gases. A first lambda value (?1) of the air-fuel mixture is set to less than 1. The gases pass through a first catalyst and then through a second catalyst. The CO-concentration of the gases in the first catalyst is sufficiently high to reduce NOx to N2so that the NOx concentration is reduced to a predetermined value. Oxygen (O2) is introduced between the first catalyst and the second catalyst to oxidize both CO and HC to CO2 and H2O, to reduce the CO-concentration to a predetermined value. A second lambda value (?2) is measured in the gases downstream of the second catalyst, and a valve for regulating the air-fuel ratio is controlled so that the second lambda value (?2) lies within a predetermined range whose lower limit is higher than 1.

Abstract: A method of making a cutting insert includes: (i) forming a blank having a substrate and superhard material, the substrate having more than 4 pockets, the superhard material disposed within the pockets; (ii) removing cutting tips from the blank by cutting the blank along cutting lines; (iii) providing a cutting insert body having a plurality of cavities for receiving a corresponding number of cutting tips; (iv) inserting a cutting tip into each of the plurality of cavities; and (v) brazing the cutting tips to the cutting insert body.

Abstract: A method of producing a heating element made from molybdenum silicide and alloys thereof, and which includes aluminum oxide on its surface. A material is produced that contains substantially Mo(Si1-xAlx)2 and Al2O3 by mixing a mixture of a silicon and molybdenum compound with m aluminum compound. Either of the silicon and molybdenum compounds include Mo(Si1-yAly)2 and are mixed with one or both of an aluminum compound in the form of Al2O3 or Al(OH)3 and optionally the compounds SiO2, Si, and MoO3, or by virtue of the mixture of the silicon and molybdenum compound containing MoO3 and Al and Si and/or SiO2. The input components together have a degree of purity corresponding to at least 98%. The mixture reacts exothermically and/or by being sintered, so that exchange reactions take place to form the compounds Mo(Si1-xAlx)2 and Al2O3, where x lies in the range of 0.4-0.6.

Abstract: A rotatable tool for chip removing machining includes a drill shank, and an exchangeable loose top mounted at an axially front end of the shank. Between these there is a coupling, which includes a male part on the loose top, and a groove in the basic body. By means of a slot, two deflectable legs are defined by the shank, which legs form a jaw for receiving and clamping the male part. The maximal width of the jaw upon deflection of the legs away from one another is larger than the maximal breadth of a wedge portion included in the male part. Furthermore, the angles of inclination of flank surfaces on the male part and side surfaces in the groove, are equally large in order to guarantee surface contact between said surfaces, when the legs are resiliently tightened against the male part. The wedge portion is of dovetail shape, wherein the loose top is drawn axially against the shank as it is being radially clamped by the legs.

Abstract: A shank milling cutter includes a cutting portion which is intended to come into engagement with the workpiece, wherein the envelope surface of the cutting portion is substantially cylindrical. At least one major cutting edge is arranged at the peripheral surface of the cutting portion and at least one minor cutting edge (face cutting edge) is arranged at the end face of the cutting portion and with an end diameter D. The minor cutting edge, in projection onto a plane containing the milling cutter axis, has a convexly curved portion with a radius of curvature R>D/2 and a center of curvature M located such that a distance from the center of curvature M to the axis is in a range from zero to a value smaller than D/2.