Abstract: There is described a cutting tool with improved properties for metal machining having a substrate of cemented carbide and a hard and wear resistant coating on the surface of said substrate. The coating is deposited by Physical Vapor Deposition (PVD). The coating is composed of metal nitrides in combination with alumina (Al2O3). The coating is composed of a laminar multilayered structure. The insert is further treated to have different outer layers on the rake face, and flank face respectively.

Abstract: A tool for chip removing machining, including a basic body, and a cutting insert fixed in an insert seat in the basic body by a tightening element, and which, via at least one shoulder surface, is held pressed against a stop surface in the insert seat. An elastically deformable spring is arranged in the insert seat, which provides, by elastic deformation as a result of tightening of the tightening element, the pressing of the shoulder surface against the stop surface.

Abstract: The present invention provides a method of gel-casting WC—Co cemented carbide powder, where the resulting gelled body can be of complex shape and has a high green density, a good homogeneity and sufficiently good mechanical properties for the gelled body to be demolded and dried without significant shape-distortions and cracking. The method relates to the forming of a gelled body through the gelling of an aqueous slurry of WC—Co cemented carbide powder with good dispersion characteristics, where the gelling is achieved by the temperature induced polymerization reaction between a monomer and a cross-linker, catalyzed by a free-radical initiator. By further subjecting the body to drying, heating, and sintering, a dense cemented carbide body is obtained.

Abstract: A screening arrangement in a vibrating screen for screening of material, such as crushed stone, gravel or the like, the screening arrangement having one or more screening decks placed at different heights and provided with directing means, where the directing means are provided on the underside of at least one upper screening deck to direct the screened material upstream onto a screening deck located below the at least one upper screening deck.

Abstract: In a movable conveyor belt storage installation including a belt storage means (4), conveyor belt support structures (29) following the belt storage means (4), and a movable takeover car (7) including a deflection means (43) for the conveyor belt and a takeup chute (8) for taking over excavated material, the belt storage means (4) is comprised of at least two segments (13, 20, 22, 26) which are connected with one another so as to be pivotable about an axis extending transversely to the belt running direction and passing through the plane of the floor (31), wherein at least a portion of the support structures (29) are capable of being carried along in or on the takeover car (7).

Abstract: The invention relates to a method for drilling rock, wherein holes to be drilled are determined prior to drilling as a drilling pattern wherein for each hole, a starting place, direction and hole depth for drilling are determined with respect to the rock to be drilled. In the invention, hole-type-specific drilling parameters are determined for the holes to be drilled, and during a drilling phase a drill rig automatically selects drilling parameters for each hole to be drilled on the basis of the hole type of the particular hole.

Abstract: A CVD-coated cutting tool insert with a TiCxNy-layer with a low tensile stress level of 10-300 MPa and an ?-Al2O3-layer with a high surface smoothness of <0.1 ?m as measured by AFM-technique is disclosed. This is obtained by subjecting the coating to a first intensive wet blasting operation with a slurry of F80 grits of Al2O3 followed by a second wet blasting treatment with a slurry of F320 grits of Al2O3.

Abstract: A drill hole measuring device and a rock drilling unit equipped with the measuring device. The measuring device (1) comprises a protective element (3), inside which a sensor (6) can be transferred by means of a transfer device (4).

Abstract: A method for controlling rock drilling and a rock drilling arrangement having at least one feed channel of a feed actuator provided with a restrictor, which causes a pressure drop if the penetration rate increases and, consequently, a flow through the restrictor increases. A pressure difference and an increase in the penetration rate can be detected by sensing the pressure before the restrictor and after the restrictor. When the feed rate increases, a hydraulic system is arranged to decrease percussion pressure.

Abstract: A Method and an arrangement for increasing safety when handling a wheel. The method comprises locking a fastening bolt of the rim in the vicinity of a wheel valve in place with a locking device. The arrangement comprises a locking device which locks at least one fastening bolt in the vicinity of the wheel valve in such a way that the fastening bolt cannot be detached before the locking device is removed.

Abstract: A closure system for a trough comprising a first closure member and a second closure member, the first closure member being movable between a closed position, where it closes against the perimeter of a first opening in the bottom of a trough and an open position where it retracts to a position away from contact with the perimeter of the first opening, the second closure member being movable between a closed position where it closes against the perimeter of a second opening in an opposite side of the bottom of the trough and an open position where it retracts to a position away from contact with the perimeter of the second opening, and first and second controllers operable to move the first closure member and second closure member respectively between the open and closed positions.

Abstract: A cutting tool, and a loose top therefore, includes two parts detachably connected to each other via a threaded joint in which co-operating male and female threads are included in the form of helicoidal ridges. The profile shape of each helicoidal ridge is defined by a top and two flanks, which delimit a helicoidal groove having a bottom. The first flank is inclined in relation to a center axis of the tool at a first angle that is smaller than a second angle of the second flank in relation to the center axis. Accordingly, the thread ridge is reinforced in comparison with thread ridges having a symmetrical profile shape, whereby larger tensile forces than compressive forces can be applied to the threaded joint while avoiding damage to the thread ridges.

Abstract: A cutting pick comprising a cutting tip 10 formed such as from SiC-D and a metal pick body 11. The pick body 11 has a greater coefficient of thermal expansion than the cutting tip 10. The pick body 11 includes a generally cylindrical cavity 14 within which is received a generally cylindrical anchor portion 13. The tip 10 includes a coating 17 bonded to the outer surface of the anchor portion 13. An annulus 24 is left between the coating 17 and the cavity 14 within which is a solder or braze material which bonds to each of the coating 17 and the cavity 14. The pick body 11 employs the difference in thermal expansion to exert pressure on the anchor portion 13 to fix the tip 10 to the pick body 11.

Abstract: Feed back vibrations of a metallic tool generated during the machining of metallic workpieces are damped by detecting an oscillatory motion of the tool, identifying a frequency of the oscillatory motion and generating a mechanical camping force having the same frequency as the oscillatory motion and applied to the tool in counter-direction to a velocity of the oscillatory motion. The damping force can be of constant amplitude or gradually decreasing amplitude.

Abstract: A titanium based carbonitride alloy contains Ti, Nb, W, C, N and Co. The alloy also contains, in addition to Ti, Co with only impurity levels of Ni and Fe, 4-7 at % Nb, 3-8 at % W and has a C/(C+N) ratio of 0.50-0.75. The Co content is 9-<12 at % for general finishing applications and 12-16% for semifinishing applications. The amount of undissolved Ti(C,N) cores must be kept between 26 and 37 vol % of the hard constituents, the balance being one or more complex carbonitrides containing Ti, Nb and W. The invented alloy is particularly useful for semifinishing of steel and cast iron.

Abstract: A turning tool including a basic body having an insert seat, an indexable turning insert having a triangular basic shape, and a tightening element fixing the turning insert in the insert seat. The insert includes an upperside and an underside between which three side surfaces extend that are situated in a first imaginary, equilateral triangle and therefore converge in pairs at an angle of 60° toward corners in which cutting edges are included. The turning insert is engaged with the insert seat via an interface that includes elongate and straight, female-like and male-like engagement members, which are in engagement with each other in order to prevent turning of the turning insert. The insert seat includes a supporting surface having a corner section against which an active corner of the turning insert is applied.

Abstract: The invention relates to a method for correcting positioning errors in rock drilling, and a rock drilling equipment. Deviation of the boom position from the theoretical position is measured as a function of the position of at least one boom joint, the measured deviations are stored in the memory of the drilling rig, and when the boom is positioned to the drilling position, its position is corrected on the basis of the stored deviation. The drilling equipment includes a memory for storing the deviations between the true position of the boom and the theoretical position calculated on the basis of the joint sensor values, and a calculating device for correcting the boom position on the basis of the deviations stored in the memory of the drilling rig.

Abstract: An indexable milling insert, including an upperside, an underside parallel to an imaginary reference plane, and two cutting edges. Each cutting edge includes a cutting edge line and is formed between a chip surface included in the upperside and a first clearance surface extending between the upperside and the underside, the first clearance surface forming an acute, nominal first clearance angle (?) with a normal to the reference plane. Each cutting edge includes a main edge, which is at least partly convexly curved as viewed in plane elevation from above, and which extends from an initial end, which determines the maximal cutting depth of the milling insert, to a corner edge having a radius of curvature that is smaller than the radius of curvature of the main edge, the main edge rising in the direction from the initial end toward the corner edge such that the distance thereof to the underside successively increases in the direction.

Abstract: In a first aspect, the invention relates to a rock-drilling tool that comprises a drill rod (1;1??) having a male thread (5;5?), and a coupling sleeve (7:7?) having a female thread (15:15?) for the co-operation with the male thread of the drill rod. The male thread (5;5?) of the drill rod (1;1?) may consist of a martensitic, stainless steel. The coupling sleeve consists of hardened low-alloy steel. Axially inside the male thread (5;5?), a waist (32;32?) is formed in which the drill rod (1;1?) has the smallest diameter thereof. The male thread (5;5?) has a wear volume that is larger than the wear volume of the female thread (15; 15?). Furthermore, the invention relates to a drill rod per se as well as a coupling sleeve per se.

Abstract: A method and a control system for positioning a mine vehicle. Measurement of a distance travelled by the mine vehicle is based on monitoring rotation of a wheel. In the invention, an error caused in the distance measurement by wear of the wheel is compensated for automatically when the distance value obtained from monitoring is corrected by a correction factor. The value of the correction factor is updated at predetermined intervals during use.