Abstract: Furnace insulation comprising fibre modules in the form of at least two cylinder segments (2, 3; 7, 8) that are placed against one another so as to form a cylinder whose internal volume constitutes the furnace space and that are adapted to allow an electrical resistance element (5) to lie against and be fastened in the inner surface (4) of the cylinder. The present invention is characterized in that the inner part of the cylinder includes one or more radially extending or generally radially extending openings (12; 14).

Abstract: A cutting bit (10), in particular for face milling cutters, having an upper and a lower surface (3) which are connected by circumferential edge surfaces (4), wherein the cutting bit in plan view on to the upper surface (3) is of an approximately octagonal basic shape with alternately small and large corner angles, wherein formed between the respective corners (6, 7) at the transition of the circumferential surfaces (4) to the upper and/or lower surface (3) are respective cutting edges (1a, 1b, 1c, 1d, 2a, 2b, 2c, 2d) of which a part (2a, 2b, 2c, 2d) in a top view appear as in a slightly broken or curved over a relatively smaller radius for use as roughing cutting edges and another part extends between adjacent corners (6, 7) straight or with a relatively larger radius for use as finishing cutting edges (1a, 1b, 1c, 1d).

Abstract: A tool for chip removing machining comprising a tool head, which is provided with insert seats for the receipt of replaceable cutting inserts as well as a fastening part intended to be received in a machine tool. The tool has at least two chip pockets, in each one of which two replaceable cutting inserts are arranged, the two cutting inserts arranged in each chip pocket being intended for different types of machining and having the active surfaces thereof opposite each other. Furthermore, the two cutting inserts arranged in a common chip pocket have their axially furthermost portions located at different levels in the axial direction of the tool. The two cutting inserts for turning are located in different chip pockets and have their axially furthermost portions thereof located at different levels in the axial direction.

Abstract: A rotatable tool includes a shank rotatable about a longitudinal axis, a drawbar mounted to an axial front end of the shank, and a cutting head mounted to an axial front end of the drawbar. The shank and the drawbar include mutually engageable screw threads which impart an axial displacement of the drawbar relative to the shank. The cutting head and the drawbar include mutually engageable serrations for transferring axial force therebetween. The serrations are axially spaced from one another and extend transversely relative to the axis.

Abstract: A cutting insert has a body formed of a superhard material or a superhard material and a cemented carbide, and has a hole through said body and a preformed hole inlay in said hole to allow securing of the insert to a holder. The method of making same is also disclosed.

Abstract: An improved cutting tool insert and a method for the preparation of such cutting tool insert, having a sintered alumina and silicon carbide whisker composite material body, comprising the steps of milling and mixing the powdered starting materials of said composite material and forming said material into a preformed workpiece, heating up said workpiece at a heating rate of from about 20 to about 60° C. per minute to a sintering temperature of between from about 1600 to about 2300° C., and holding at said sintering temperature for a holding time of from about 5 to about 60 minutes at a pressure of between from about 20 to about 100 MPa.

Abstract: The present invention relates to a material for use at temperatures exceeding 1200° C. and in oxidizing atmospheres consisting generally of an alloy between a metal, aluminium (Al) and carbon (C) or nitrogen (N). The invention is characterized in that the alloy has a composition MZAlYXW where M essentially consists of titanium (Ti), chromium (Cr) and/or niobium (Nb) and where X is carbon (C) or where X is nitrogen (N) and/or carbon (C) when M is titanium (Ti); and in that z lies in the range of 1.8 to 2.2, y lies in the range of 0.8-1.2 and w lies in the range 0.8-1.2, and wherein a protective oxide layer of Al2O3 is formed after heating to the mentioned temperature.

Abstract: The present invention relates to a cutting insert particularly for turning of stainless steel comprising a cemented carbide substrate and a post-treated coating with a substrate of cemented carbide having a composition of from about 5.0 to less than about 8.0 wt % Co, from about 3.0 to about 8.0 wt % cubic carbides of the metals Ti, Ta and Nb with a Ti/(Ti+Ta+Nb) ratio of from about 0.05 to about 0.3 and balance tungsten carbide (WC) having a grain size of from about 1.5 to about 3.5 ?m in the as-sintered state. Further, the substrate has a surface zone of from about 5 to about 30 ?m characterized by an enrichment of binder phase and a depletion of cubic carbides, and a coating having a first, innermost layer system of one or several layers of TiCxNyOz with x+y+z?1 with a total thickness of from about 0.7 to about 5.

Abstract: A drill includes a tip-forming front end having at least two straight cutting edges and at least two chip flutes extending from the tip end towards a rear end. Each cutting edge includes an inner portion disposed near a center line of the drill, and an outer portion disposed farther from the center line. The peripheral end of each cutting edge is in the form of a smoothly curved nose portion protruding radially with respect to the center line. The nose portion is formed by several circular segments having mutually different radii (R1, R2, R3). Adjacent ones of the radii are of different size.

Abstract: The present invention relates to a rock drill bit for percussive drilling. The drill bit comprises a bit body; a head portion defining a longitudinal center axis. The head portion comprises a front face having an outer surface portion, and an inner surface portion disposed radially inside of the outer surface portion. The inner surface portion is partially recessed by a cavity with respect to the outer surface portion. A plurality of fluid channels extends through the head portion and communicates with the cavity for conducting a flushing medium thereto. The inner surface portion comprises a raised portion carrying a plurality of buttons. An imaginary circle intersects centers of the fluid channels and also intersects an equal number of buttons.

Abstract: The present invention relates to a cutting tool insert of a generally polygonal shape provided with a ceramic tip in a recess in at least one of its corners with a bottom surface and at least one side surface. At least the bottom surface of the recess is provided with rails with a height h being from about 50 to about 100 ?m, width w being from about 100 to about 200 ?m and spaced at distance 1 from about 0.75 to about 1.25 mm. The invention also relates to a method of making such an insert using a grinding wheel of a suitable profile before or after sintering or in the pressing operation.

Abstract: A tool for chip removing machining, including a basic body and a replaceable cutting insert that has a center axis and is detachably mounted in an insert seat formed in the basic body. The seat is delimited by a bottom surface and at least one side support surface. The cutting insert includes an out of round engagement surface that is pressed against an out of round shoulder surface to rotationally secure the cutting insert. The shoulder surface is included in a separate lock member that is partially inserted in a space formed in the basic body, the space opening towards the insert seat and located between the side support surface and the bottom surface of the insert seat such that the lock member rotationally secures a lower part of the cutting insert, while an upper part of the cutting insert is supported by the side support surface.

Abstract: The present invention relates to a method for joining two or more components and/or construction parts, at least one of which consists of a dispersion-strengthened alloy having the following composition (in % by weight): C up to 0.08 Si up to 0.7 Cr 10-25 Al 1-10 Mo 1.5-5 Mn up to 0.4 balance Fe as well as normally occurring impurities by the fact that the cross section in the joint is enlarged by forging before joining and where the product manufactured according to the method can be used in high-temperature applications at temperatures above 900° C.

Abstract: A cutting insert having a front cutting edge and a connecting surface including male- and/or female-like engagement portions, in order to rigidly secure the cutting insert, a geometrically predetermined reference locus serving as a force-application spot for the clamping of the cutting insert. Simultaneously active engagement portions are of only two types—a first, elongate engagement portion, which is located between the front cutting edge and the reference locus, and a second, elongate engagement means, which is oriented at an angle to the first engagement portion and situated at a greater distance from the front cutting edge than the reference locus. In such a way, it is guaranteed that a tightening force always is applied to the cutting insert in a substantially triangular area, which is defined by the free ends of the engagement portions. Furthermore, a tool for chip removing machining, as well as an attachment, e.g., a shim plate, for such tools is provided.

Abstract: A method of making cemented carbide at which powders forming hard constituents and powders forming binder phase are wet milled together with a pressing agent is disclosed. The slurry is dried, preferably by spray drying, compacted into bodies of desired shape and sintered. A cemented carbide powder with a reduced compacting pressure at a predetermined weighing in of 18% shrinkage can be obtained by using from about 1 to about 3 wt-% pressing agent with the following composition: less than about 90 wt-% PEG and greater than about 10 wt-% of long chain C?20 fatty acids, their esters and salts, in particular, erucic acid and/or behenic acid. The invention also relates to a cemented carbide powder with low compaction pressure.

Abstract: According to the present invention there is now provided a body cemented carbide provided with at least one wear resistant layer, which body contains a toughness increasing surface zone. Increase in toughness is obtained due to the presence of a surface zone having increased WC grain size and/or increased Co content. The invention is most suitable for WC—Co cemented carbides.

Abstract: The present invention relates to an electrical resistance element of the molybdenum silicide type that includes two terminals (1, 2) for the supply of electric current and at least one leg (3) which extends between the terminals and which includes a glow zone. The invention is characterized in that the glow zone has different diameters along different sections (6-11, 14-17) of the leg (3; 4, 5).

Abstract: A boring bar, such as for internal turning, includes a front pocket that is defined by a shelf-like surface and a ramp surface, an insert seat that is countersunk in the shelf surface and disposed asymmetrically in relation to a center axis, a chip flute that is countersunk in the outside of the bar is disposed on the same side of the center axis as the insert seat, and an internal channel that supplies a fluid to the front part of the bar. The fluid channel ends in an outlet mouth disposed on the side of the bar that is opposite the insert seat in order to guide a flow of the fluid past the insert seat toward the front opening of the chip flute.

Abstract: In a method for starting a crushing operation in a gyratory crusher in which rocks are passed through a crushing gap to be crushed, the following steps are carried out: (a) a driving device is started which causes a crushing head to execute a gyratory pendulum movement, and a first width of the crushing gap is set, (b) a supply of material to the gap is commenced, (c) the resulting load on the crusher is measured, (d) the width of the gap is adjusted so that the load approaches a desired value, (e) a measure which is representative of the width of the gap after adjustment, is read, and (f) such read measure is utilized for calculation of a gap width for use as a first width of the gap in carrying out step (a) of the next start-up of a crushing operation.

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. A related cutting insert includes: a cutting insert body having a plurality of cavities formed therein; a plurality of cutting tips, each of the plurality of cutting tips disposed in a respective cavity, the cutting tips having a geometry that provides a mechanical retention or lock when inserted into the cavities of the cutting insert body, the cutting tips further being brazed in the cutting insert body.