Abstract: A drive sprocket arrangement includes a drive sprocket and a drive ring rolling loosely on the outer periphery of the sprocket. Drive links of the saw chain enter recesses in the sprocket via orifices in the drive ring. The drive ring has at an axial inner edge thereof a radially inwardly directed flange to retain the ring on the sprocket, and at an axial outer edge thereof a radially outwardly directed flange to retain the chain in place. The flanges are arranged such that the axial inner edge will be disposed above the axial outer edge when the drive shaft of the chain saw points downwardly.

Abstract: A saw blade is provided with recurring groups of teeth. Each group of teeth includes one straight tooth, an even number of high set teeth, and an even number of low set teeth. Distances from all of the teeth in the group to a corresponding, immediately preceding teeth are different for all of the teeth. Distances from all of the teeth in the group to a preceding tooth of the same height are different for each tooth. Distances from all of the set teeth in the group to the nearest preceding set tooth with the same set are different for each set tooth. No high teeth are immediately adjacent.

Abstract: Guide bar for saw chain, where the chain is supported by a nose sprocket while traversing the front end. Regions of the edges of the guide bar are locally hardened to a higher hardness than the rest of the guide bar. The regions of hardness are where the chain impacts the bar near an attachment end of the guide bar after having left the drive sprocket of the power socket, and where the chain settles on the guide bar edge after having been supported by the nose sprocket while traversing the nose curvature, where a cutting action occurs on the bar, but omitted in an area delineated from a point adjacent the oil holes at the attachment end to a point before where a majority of the cutting action occurs.

Abstract: According to the invention there is now provided a simple method of preparing a powder containing WC and cobalt and/or nickel. APT-powder and a powder of a basic salt of cobalt and/or cobalt are mixed in water or in mixed solvents. The suspension is stirred to react at temperatures ranging from room temperature to the boiling point of the solution whereby a precipitate is formed, which precipitate is filtered off, dried and finally reduced to a metallic powder.

Abstract: There is disclosed a method for edge rounding of cutting tool inserts of cemented carbide or titanium based carbonitride alloys. An electrolytic method is used with an electrolyte which provides an even removal of both binder phase and hard constituent phases. The electrolyte comprises perchloric (HC10.sub.4) sulphuric (H.sub.2 SO.sub.4) acid, 2-15 vol %, and mixtures thereof in methanol or other suitable organic liquid. The method is easier to control than conventional mechanical methods and is particularly useful for providing very small edge radii of about 10 .mu.m which cannot be made by mechanical methods.

Abstract: A toolholder for indexable cutting inserts includes a holder body forming an insert site. A pin projects upwardly at the insert site for entering a center hole of an insert. A clamping wedge is attached to the body by a screw. A rear end of the wedge engages an inclined supporting surface of the body, and a front end of the wedge engages the insert. By tightening the screw, the front end of the wedge pushes against the insert simultaneously downwardly and forwardly to press the insert against the pin and a floor of the insert site. The front end of the wedge includes a pair of forwardly projecting upper protrusions for engaging the top face of the insert, and a pair of forwardly projecting lower protrusions for engaging an edge face of the insert. The upper protrusions, and also the lower protrusions are disposed on opposite sides of an imaginary plane which contains the axis of the pin and the axis of the clamping screw.

Abstract: A ceramic monolith coated with a catalytic material is heated by a flat strip cross-section steel wire with at least 15% Cr and at least 0.5% Al. The wire is placed in the monolith near its entry face.

Abstract: According to the present invention there is provided a wear resistant material consisting of 3-60% by volume of diamond in a matrix containing at least one hard constituent consisting of carbide, nitride and/or carbonitride of one metal of group IV, V and VI in the Periodic Table and a binder phase based upon Co, Ni and/or Fe at which the diamonds are surrounded by a layer >1 .mu.m of refractory metals, carbides, nitrides, oxides, borides or silicides. In this way, a dissolution of diamonds during the sintering is prevented by a special combination of layer material and sintering compaction process.

Abstract: There is now provided a method for preparing a powder containing W and Co and/or Ni from APT and a soluble salt of Co(Ni) by a chemical reaction in a water suspension at temperatures from room temperature to the boiling point of the solution whereafter the formed powder is filtered off, dried and reduced to a metallic powder. Additional metals from groups IVa, Va or VIa of the periodic table of the elements are added to the suspension as compounds like oxides, hydroxides, soluble or insoluble salts.

Abstract: A duplex stainless steel alloy has been provided which contains in % by weight:--C max. 0.05--Si max. 0.8--Mn 0.3-4--Cr 28-35--Ni 3-10--Mo 1.0-4.0--N 0.2-0.6--Cu max. 1.0--W max. 2.0--S max 0.010--Ce 0-0.2the remainder being Fe and normally occurring impurities and additives. The ferrite content is 30-70% by volume, balance austenite. The steel alloy is very suitable in the environments that exist at the production of urea, in which it may advantageously replace the austenitic steels used so far.

Abstract: According to the invention there now is provided a method of producing a sintered titanium based carbonitride alloy with 3-25 weight % binder phase with extremely good properties at intermittent machining of materials difficult to machine. The method relates to the use of a raw material comprising a complex cubic carbonitride containing the main part of the metals from groups IV and V of the periodic system and carbon and nitrogen to be found in the finished alloy whereby said alloy has the composition0.86.ltoreq.X.sub.IV .ltoreq.0.970.44.ltoreq.X.sub.C .ltoreq.0.55where X.sub.IV is the molar ratio of the group IV elements of the alloy and X.sub.C is the molar ratio of carbon.

Abstract: The invention provides a ferritic stainless steel alloy useful for strip steel used in exhaust catalytic converters, consisting essentially of in weight %, .ltoreq.0.02% C, 19-21% Cr, 4.5-6% Al, 0.01-0.03% Ce, 0.02-0.05% total of rare earth elements, .gtoreq.0.015% total Mg+Ca, and balance Fe plus impurities. The alloy can contain 0.2-0.4% Mn, 0.1-0.4% Si, .ltoreq.0.5% Ni, .ltoreq.0.02% P, .ltoreq.0.005% S, .ltoreq.0.025% N, 0.015-0.025% Mg, 0.0005-0.0018% Ca, 0.005-0.015% La, 0.02-0.03% Ce, .ltoreq.0.015% Ti and .ltoreq.0.015% Zr.

Abstract: There is provided a method of coating cutting tool inserts by CVD methods with a completely covering coating. During the coating step, the inserts are resting in contact with the support in only a few tiny spots and sufficient space is allowed around each insert to ascertain optimum coating conditions. In a preferred embodiment, each insert rests on a peg allowing a rational production in larger scale and fully automatic CVD loading.

Abstract: A percussion drill bit for drilling bores, comprises a drill body having a plurality of gauge row inserts embedded in a front end of the drill body. Each gauge row insert comprises a cemented carbide body having a mounting portion embedded in the drill body, and a front end protruding from the drill body. A polycrystalline diamond layer is provided on the front end of the carbide body. The diamond layer has a rear edge disposed in the vicinity of a maximum diameter of the insert. That rear edge is spaced from the wall of the bore during drilling by tilting the gauge row insert at an acute angle of 41.degree. to 51.degree. relative to the rotational axis of the drill bit. The front end of the carbide body is defined by a radius whose origin lies on a center axis of the insert. That origin is disposed axially rearwardly of a plane containing the rear edge of the diamond layer. The length of that radius is 50% to 52% of a diameter of the mounting portion of the insert.

Abstract: A cutting insert is formed by making a body (e.g., carbide) which includes a chip face having an outer peripheral edge. The chip face includes a complex chip breaker structure, and a recess disposed between the edge and the chip breaker structure and spaced inwardly from the edge. The recess is filled with a powder of hard material (e.g., diamond or cBN) which is then transformed into a hard body under high pressure and heat conditions. The portion of the base disposed between the edge and the hard body is sufficiently thick to support the body during that pressing step. Then, some or all of that portion is ground away.

Abstract: A milling cutter body of basically cylindrical shape has a plurality of grooves of a circular cross-section each of which intersects the envelope surface of the cutter body. These grooves receive insert-carrying cartridges of a corresponding circular cross-section. Each cartridge is adjustably rotatable about an axis of its respective groove and is also axially adjustable along such axis. The groove axes are not parallel to the axis of rotation of the cutter body but are inclined to it. A precise positioning of the parallel land angle of the cutting edges is obtained by turning the cartridge about the groove axis and/or axially adjusting the cart ridge along that axis.

Abstract: A method and apparatus for coating components such as cutting tools with diamond using a microwave plasma excited gas mixture in a reactor equipped with a bowl-shaped substrate table having a concave inner surface for supporting the components to be coated. The plasma forms a plasma ball during the coating operation and the geometrical shape, configuration and position of the table is adapted to stabilize the plasma and control the shape and position of the plasma in such a way that the outer surface of the plasma conforms substantially to the surfaces of the components to be coated. The table can include a system of channels for optimized gas flow and metallic or ceramic wires or rods to control the shape and position of the plasma as well as yield additional excitation of the gas mixture. The table can include an upper rim which facilitates coupling of the plasma directly to the table. The table can include ledges, rods, compartments and/or holes for supporting the components to be coated.

Abstract: According to the invention there now is provided a method of producing a sintered titanium based carbonitride alloy with 3-25 weight-% binder phase with extremely good properties at semifinishing operations at turning. The method relates to the use of a raw material consisting of a complex cubic carbonitride comprising the main part of the metals from groups IV and V of the periodic system and carbon and nitrogen to be found in the finished alloy whereby said alloy has the composition0.85.ltoreq.X.sub.IV .ltoreq.0.990.58.ltoreq.X.sub.C .ltoreq.0.69where X.sub.IV is the molar ratio of the group IV elements of the alloy and X.sub.C is the molar ratio of carbon.