Abstract: A cutting insert includes a top chip face, a bottom surface and side faces extending therebetween. At each of the end faces the cutting insert has axially protruding portions, each of which having a bevel. Main cutting edges are provided by the intersection between the top face and respective side surfaces. On each side surface there is provided a clearance portion formed on a protruding portion of the insert body which via a step extends into a secondary helically twisted clearance surface, the chip angle of which increases with increasing cutting depth. With the cutting insert viewed in plan, the bevel is oriented perpendicularly to the main cutting edge.

Abstract: An uncoated titanium-based carbonitride cutting tool insert with superior plastic deformation resistance and wear resistance is provided. This is accomplished by heat treating the material in nitrogen atmosphere under conditions to obtain a nitrogen rich surface zone, also containing substantial amounts of binder phase.

Abstract: Package for tools (10,20) or similar products which are displayed hanging from pegs, comprising a card (12,21) with a peg opening (13) and product information (14). The card is not easily removable from the product, and can by rotation or sliding be transferred from a first position with the opening and the information visible above the product to a second position behind the product.

Abstract: A catalytic converter includes a channel for conducting a gas flow forwardly in a longitudinal direction. The channel is coated with a catalyst and has at least first and second turbulence generators spaced apart in the longitudinal direction for making the gas flow turbulent. Each turbulence generator includes a rear face inclined forwardly at an angle of from 35 to 60° from a base of the channel and facing rearwardly, a connecting face extending forwardly from a free edge of the rear face and a front face projecting toward the base from a front edge of the connecting face and facing forwardly. The first turbulence generator is disposed closer to an inlet of the channel than the second turbulence generator. A longitudinal center of the first turbulence generator is spaced longitudinally from the channel inlet by a distance, which is a function of the hydraulic diameter of the channel, the Reynold's number, and the Schmidt's number 1 of the gas.

Abstract: The present invention relates to a method for sintering of a silicon nitride based material using gas pressure sintering technique. It has been found that using a sintering atmosphere containing nitrogen and 0.1-10 vol-% carbon monoxide a cutting tool material is obtained with improved properties, particularly increased edge toughness, when machining heat resistant alloys.

Abstract: Overburden drilling equipment for drilling a hole includes a down-the-hole hammer formed by a cylinder and a piston reciprocating in the cylinder due to pressurized water being directed alternately to the upper and lower ends of the piston. Each downward stroke inflicts an impact blow upon an anvil portion of a drill bit extending upwardly within the lower portion of the cylinder. A drill chuck is mounted at a lower end of the cylinder to receive the drill bit. A generally cylindrical casing shoe is attached to a casing and is rotatably connected to the drill bit to be longitudinally advanced thereby during drilling operation. The drill chuck includes at least one key which defines the largest radius of the drill chuck. The casing includes a diametrically reduced portion which has at least one keyway therein. The key and the diametrically reduced portion retain the hammer longitudinally in relation to the drill bit.

Abstract: A coated milling insert particularly useful for milling in low and medium alloyed steels with or without raw surface zones during wet or dry conditions. The insert is characterized by a WC-Co cemented carbide with a low content of cubic carbides and a highly W alloyed binder phase and a coating including an inner layer of TiCxNyOz with columnar grains, a layer of &kgr;-Al2O3 and, preferably, a top layer of TiN. The layers are deposited by using CVD methods.

Abstract: A sheath for secateurs comprises an elongated tray provided at an upper end with a mounting clip and at a lower end with an open rim extending along an outer periphery of the tray and consisting of a bottom rim portion and two vertical portions. The sheath is made from a polymer, and the rim vertical portion are elastically deformable and provided with retaining tongues serving to retain a secateur in the sheath. For easy manufacture of the sheath, the tray is provided with openings disposed behind respective ones of the tongues.

Abstract: The invention relates to the use of a ferritic-austenitic stainless steel alloy as construction material for components in the process industry, which components can be foreseen to come into direct contact with caustic soda.

Abstract: A method of making a whisker-reinforced ceramic body by hot pressing a preform to a disc, cutting the disc into blanks and grinding the blanks to bodies of desired shape and dimension is disclosed. The preform is prepared by dispersing 10-60% by volume of a ceramic powder mixture containing conventional sintering aids and/or grain growth inhibitors in water or an organic solvent adding 1-15 wt-% starch to the dispersion; pouring the dispersion into a mold with desired shape; heating the suspension to 50°-100° C. for 2-4 hours while covering the mold to avoid water evaporation to form a preform; removing the preform from the mold; and presintering the preform in air for 10 h at a maximum temperature of about 600° C.

Abstract: A percussive drill for extension drilling includes a drill bit, a tube having a male screw thread attached to a female screw thread of the drill bit, and a rod having a male screw thread attached to a female screw thread of the tube. Central passages of the rod and tube are aligned with one another to conduct flushing fluid to the drill bit. The drill bit drills a hole whose diameter is from 60-170 mm and at least twice the outer diameter of the rod. A total area of a cross-sectional surface of the tube is within 100-125% of a total area of a cross sectional surface of the rod.

Abstract: A device for the clamping of cutting inserts for cutting metal machining. The device includes a mainly straight locking screw, which is threaded through a through center hole in the cutting insert and is threaded firmly into a threaded boring in a cutting insert seat intended for accommodating the cutting insert. The cutting insert seat is provided in a cutting insert holder body, such as a turning bar, a milling cutter body or a drilling tool. The head of the locking screw is chamfered in at least two places to enable the cutting insert to be stepped over the locking screw head when the screw is screwed upwards a predetermined number of revolutions. Thus, the present invention eliminates the need for the screw having to be detached from the threaded boring in order to remove the cutting insert.

Abstract: A new austenitic stainless steel alloy is provided (in wt. %) according to the following analysis:C: less than 0.12%;Si: less than 1.0%;Cr: 16-22%;Mn: less than 2.0%;Ni: 8-14%;Mo: less than 1.0%;S: less than 0.03%;O: less than 0.03%;N: less than 0.05%;La: between 0.02% and 0.11%; andone of the following:(i) Ti in an amount at least 4 times the amount of carbon and 0.80% or less, or(ii) Nb in an amount at least 8 times the amount of carbon and 1.0% or less;the remainder Fe and normally occurring impurities. The new steel is particularly suitable as a super heater steel and a heat exchanger steel.

Abstract: An extension drilling system for use with a semiautomatic drilling rig. The drilling system includes a plurality of extension rods constituting a drill rod string and having cooperating male and female threaded couplings therebetween, and being right-hand rope threaded couplings. A reversible drive chuck of a drilling rig drives (either directly, or via an adaptor), the outside of the female threaded end of an associated extension rod. A gripper grips one of the extension rods to hold the drill rod string stationary when the chuck is driven in reverse. The gripper is located such that only one threaded coupling is disposed between the chuck and grippers and to ensure that when the chuck is rotated in reverse, only the desired coupling is uncoupled. The drill rods have axial passages therethrough in communication with each other and through which flushing fluid is delivered to an associated drill bit and a non-return valve is incorporated in the passage through at least one of the drill rods.

Abstract: A rotary rock drill bit includes a bit body and three conical roller cutters rotatably mounted thereon. Each roller cutter has at least first, second, and third circumferential rows of buttons spaced apart in the direction of rotation of the roller cutter. The three rows of buttons are arranged successively from a rear end toward a front end of the roller cutter. The buttons of each of the first and second rows have lengths of attack which are longer in a direction of rotation of the roller cutter than in a direction perpendicular thereto. Those longer lengths of attack are also longer than a length of attack of the buttons of the third row in the rotational direction.

Abstract: A recuperator for furnaces includes a set of tubes, which are installed in a secondary chamber (1) which is located behind a main combustion chamber of the furnace and through which hot fumes can pass from the main combustion chamber towards an outlet. The task of the tubes is to recuperate thermal energy from the fumes by bringing a combustion gas to pass through the tubes on its way to burners in the main combustion chamber. The different tubes of the tube set are designed as individual units (8) each one of which is removably inserted in the secondary chamber (1) through holes in the walls (4) thereof. In the mounted condition each tube has a closed portion projecting into the secondary chamber as well as a portion projecting from the outside of the walls of the secondary chamber, the latter portion having inlets and outlets for cold and preheated combustion gas respectively.

Abstract: A method for depositing refractory alumina (A.sub.2 O.sub.3) thin layers on cutting tools made of cemented carbide, cermet, ceramics or high speed steel is disclosed. The present method is a Plasma Activated Chemical Vapor Deposition (PACVD) process in which the plasma is produced by applying a bipolar pulsed DC voltage across two electrodes to which the tool substrates to be coated are fixtured and electrically connected.In contrast to prior art methods, built-up electrical charge on non-conducting surfaces is suppressed and hence, no arcing occurs on said surfaces. This will permit stable, long-term processing,With the present method, high-quality coatings of either single phase gamma-Al.sub.2 O.sub.3 or of a mixture of gamma- and alpha-Al.sub.2 O.sub.3 phases can be deposited on cutting tools at deposition temperatures as low as 500.degree. C.

Abstract: A down-the-hole percussive drill comprises a casing, a drill bit mounted at a lower end of the casing, a hollow feed tube fixed within the casing and extending along a center axis thereof, and a piston mounted for axial reciprocation within the casing for transmitting impacts to the drill bit. The upper portion forms a downwardly facing surface at the junction between the upper and lower portions. Passages for conducting lubricant-containing pressurized air are formed in the piston. At least one of those passages constitutes a vertical recess formed in the outer periphery of the piston. The piston includes a radially outwardly projecting rib disposed between upper and lower ends of the recess. Air is blocked from traveling past the rib until the rib becomes located opposite an annular groove formed in an inner surface of the casing.