Abstract: The invention relates to a method of manufacturing cooled valves for internal combustion engines. From a first cylindrical billet is formed a valve blank by drilling an axial blind bore therein and machining an inner circumferential groove at the blind end portion of said bore. From a second cylindrical billet is machined a cylindrical rod-shaped core and at least two coolant feed and return flow channels, said core being inserted into the bore of said blank. Then said blank and said core are assembled by a hydrostatic extrusion.

Abstract: A process and device for manufacturing, composite sections, by means of extrusion, are described. The composite sections comprise at least two components one of which is fed into the stream of metal being extruded and is securely joined to the face of the product without coming into contact with the face of the extrusion die.

Abstract: The invention concerns a process and apparatus for continuous hydrostatic extrusion wherein the pressure of the hydrostatic fluid is used to apply the blank to be extruded firmly against the walls or the bottom of a groove provided in a rotor, in such a way that the blank is entrained by the rotor without slipping to an extrusion chamber from which the blank is spontaneously extruded through a die. The invention finds use in particular for continuous extrusion of metal and alloys, including those which have a low degree of ductility.

Abstract: The materials forming the inner and outer conductors of the tip of a safety thermoelement are assembled in disk form, stacked above each other, preferably bonded together, for example by soldering, brazing, welding or the like. The disks are then extruded through an extrusion die which shapes the assembly of the disks into a pin or rodlike inner conductor, surrounded by a closed sleeve or cap formed of the outer conductor material. Preferably, the die additionally is shaped to provide an end terminal portion to the inner conductor, offset by a shoulder to permit assembly of the entire unit into a structural holder.

Abstract: A method and apparatus for use in the extrusion of billets having a powder filled container with the nose cap having a shaped projection extending into the container and the tail cap having a concave portion substantially corresponding to the shape of the nose cap. A filler tube for the container is provided in the tail cap.

Abstract: Improved electrical contact materials and a method for manufacturing same are disclosed. The improved materials comprise mechanically elongated billets composed of at least a first metal and the oxide of a second metal. The billets include a plurality of alternating substantially coaxial zones of metal-metal oxide and zones devoid of the metal oxide. The zones devoid of the metal oxide serve as slip zones and render the contact material readily formable into any desired electrical contact shape.

Abstract: A bimetal resistive welding electrode having a dispersion strengthened copper tip portion and a shank portion formed of a high conductivity copper is produced by brazing together a conductive copper billet and a dispersion strengthened copper billet to form an extrusion blank. The brazing temperature is such that the dispersion strengthened copper is not annealed. The extrusion blank is then extruded into the shape of a welding electrode with the extruding process hardening the conductive copper shank portion to produce a full hard electrode.

Abstract: Particulate aluminum or aluminum alloy swarf or waste is compressed under heat and pressure to form a billet. After subjecting the billet to a subsequent heat treatment at a higher temperature the billets are capable of being extruded by conventional extrusion apparatus. A conventional preheated billet of cast aluminum or aluminum alloy can be placed in the extrusion apparatus between the die plate and the preheated billet of aluminum or aluminum alloy swarf so that upon extrusion through the die orifice the compressed swarf billet and the conventional billet will comprise the core and coating portions of the product respectively.

Abstract: A compound billet for extrusion by isostatic liquid pressure which has a core and a casing with a gap therebetween is produced by applying a sealing ring with greater thickness than the gap between the core and the casing around the rear end of the core, then inserting the core into the casing, and pressing the sealing ring to stick in the gap between the core and the casing so that the sealing ring and/or the casing are deformed. The rear end of the casing is beveled inwardly.

Abstract: A process for the manufacture of composite sections comprising at least two components. This is achieved by means of extrusion in particular using a light metal matrix, whereby at least one insert or similar component is fed into the stream of metal being extruded, on each side of the main axis in the region of the extrusion die bearing and covered all over with light metal as a result of pressure from all sides.

Abstract: A process for sheathing a cable core with metal in which the core is immersed in oil in a container and is transferred from the container to the sheath extruder in a siphon tube in which oil flows in a direction opposite to the direction of movement of the core. From the extruder, the metal sheathed core is transferred to a drum and during such transfer the core is subjected to oil under pressure. Prior to inserting the core in the siphon tube, the latter is evacuated and filled with degassed oil. The apparatus comprises a stainless steel siphon tube with one end in the container and the other end connected to the extruder. The siphon tube has a higher intermediate portion to which a piezometric column and a pump are connected and has a coupling adjacent the extruder for supplying degassed oil to the siphon tube.

Abstract: Sheet metal or strips are rolled and heated for dispersion hardening. Disks are cut (punched), stacked, and extruded. The disks in the stack may alternate with disks which have not yet been hardened. Subsequent heat treatment of the extruded product strengthens it throughout. The method is used specifically to make a dispersion-strengthened copper alloy to be used for making electrodes for resistance welding.

Abstract: A method of manufacturing low energy-loss waveguide circuit elements in which a film of metal with a low resistivity is joined to a base metal by thermal pressing or electric plating, and a hard male die of a desired shape is pressed into the base metal from above the metal film, whereby a plastic strain is caused in the base metal thereby to form a recessed portion in the base metal having an internal surface covered with the low resistivity metal.

Abstract: A method of manufacturing low energy-loss waveguide circuit elements in which a film of metal with low resistivity is laid on the surface of a base metal and a hard metal die of a desired shape is pressed into the base metal through the metal film, so that a plastic strain is caused in the base metal thereby to form a recessed portion in the base metal, while at the same time welding the metal film to the base metal to cover the internal surface of the recessed portion with the metal film.

Abstract: A process for bonding a copper or nickel end junction piece to an aluminum electrical conductor wire. The copper or nickel end junction piece is used to make the electrical connection with terminals in meters, fuse boxes, switches and the like, thus eliminating such junctions with the aluminum wire and hence eliminating the possibility of the formation an aluminum oxide connection which may give rise to overheating and subsequent fire. The end junction pieces may be applied on-site after the aluminum wire is cut to the desired length. No special pretreatment of the aluminum wire end is necessary prior to the addition on the end junction piece.

Abstract: A method for hot isostatically compacting powder metallurgy charges in sealed metal containers wherein the container may be easily removed from the charge after compacting by providing a separating medium between the container interior and the powder metallurgy charge to prevent bonding during subsequent hot isostatic compacting, and producing during hot isostatic compacting a residual stress in said container; slitting of the container after compacting releases the residual stresses and in the absence of bonding to the compact causes the container to move away from the compact, thereby avoiding typical container-removal operations such as machining and pickling.

Abstract: There is produced a ductile silver-metallic oxide semifinished product, for example a silver cadmium oxide wire, or a sheet or square rod having silver-metallic oxide, silver-metallic, and silver metalloid compounds. There are assembled in sandwich fashion several plates of internally oxidized silver-metallic oxide and of powder metallurgically produced silver-metallic oxide. The sandwich is then extrusion pressed.

Abstract: There is produced a ductile silver-metallic oxide semifinished product, for example a silver cadmium oxide wire, or a sheet or square rod having silver-metallic oxide, silver-metallic, and silver metalloid compounds. There are assembled in sandwich fashion several plates of internally oxidized silver-metallic oxide and of powder metallurgically produced silver-metallic oxide. The sandwich is then extrusion pressed.