Abstract: The present invention is directed to a method for production preformed fabrication casing or associated parts intended to generate fragments initiated by the explosive of contained warhead charges. Molded parts having fragmentation bodies (4, 21, 34) embedded therein are produced by a two-stage powder compaction method followed by sintering together the compacted powder metal. The method described in the present invention defines how in an initial stage the fragmentation bodies (4, 21, 34) are fixed in position using a fixture (2) after which the bodies are covered with powder metal that is then compacted until the powder forms a single molded part (2) after which the fixture is replaced with a secondary quantity of powder that is also compacted to form a self-supporting unit (12) together with the first quantity of powder.

Abstract: The present invention relates to a method for the production preformed fragmentation casing or parts thereof intended to generate fragments initiated by the detonation of the explosive contained in warhead charges where the said casing or parts thereof are of the type that comprise a single-unit moulded part (7, 10 and 25,28) created by sintering powder metal and where the said moulded part contains embedded separately produced fragmentation bodies (4,21, 34). A distinguishing feature as claimed in the present invention is that the moulded part in which the fragmentation bodies (4, 21, 34) are embedded is produced by means of a two-stage powder compaction method followed by sintering together the compacted powder metal.

Abstract: Method and apparatus for atomizing a liquid to form a fine powder. The method includes the steps of mixing the liquid with a first fluid medium jet and projecting this first fluid medium jet into a barrier means which comprises a solid body or a second fluid medium jet projected by a nozzle in a direction substantially opposite to the first fluid medium jet. The first fluid medium jet containing fine particles diverges away from the barrier means, thus increasing contact surface between the first fluid medium jet and the liquid and increasing the intermixing therebetween.

Abstract: The invention is a method and apparatus for atomizing metal melts by disintegration of a vertical tapping stream of the melt with the aid of horizontal media jets of pressurized gas. The media jets are formed by two slot-shaped nozzles or row of nozzles separate from each other. The jets are oriented to flow at an angle beta between the media jets. A zone is established between the media jets just prior to the intersection of the tapping stream with the media jets. The tapping liquid is drawn back into the zone by the media jets action.

Abstract: In horizontal continuous casting, the casting proceeds step-by-step with the forming strand being intermittently pulled from the mold. The strand forms with a skin with a melt inside of the skin and this melt is stirred by a magnetic stirrer on the outside of the mold. This forms a thin wall in the skin at that location, forming a breaking location or point where the skin pulls apart each time the strand is pulled forwardly. The mold is continuously fed with melt and the skin's strand reforms or welds together at the strand break.

Abstract: A method for manufacturing an article to an intended near final shape and size with powder as the starting material. The powder is placed in a first capsule having the shape of the desired article and a size which allows for a suitable decrease in volume when pressing the powder into a solid body. This first capsule is placed in a second larger capsule and is surrounded on all its sides by a medium which is viscous at the compression temperature. The second outer capsule with its contents is heated, inserted into a press chamber, and surrounded by a readily deformable heat-insulating material such as talcum powder. A piston is inserted into the press chamber and acts to generate a pressure which compresses the material in the first capsule into a homogeneous, solid body.

Abstract: A method for manufacturing elongated dense bodies of metals or metal alloys by extrusion of a powder charge enclosed in a metal capsule. A closed, powder-filled capsule is heated to a temperature necessary for bonding the charge under pressure, and the capsule is then inserted in a pressure chamber and surrounded by a layer of a solid, readily deformable material, such as talcum powder or pyrophyllite. A piston is inserted into the pressure chamber and subjects the capsule and the surrounding material to a pressure such that the capsule and the surrounding material are pressed out together through an opening in a die. Tubes can also be extruded, with the deformable packing material filling the tube bore.

Abstract: Apparatus for manufacturing powder, especially metallic powder, by a melt atomization process, comprises a closed container in which a jet of gas is directed transversely into a stream of the melt and breaks it down into droplets which rapidly solidify and are thrown in a parabolic trajectory to the lower part of the container. In the lower part of the container there is an inclined bottom or a shaking table on which the powder flows to an outlet opening. Means are provided for withdrawing gas from the container, cooling it and re-introducing it into the lower part of the container where it is forced by guide means to flow in contact with the powder flowing to the outlet opening. The flow direction of this re-introduced gas is substantially opposite to the direction of flow of the powder to the outlet opening, so that it has an efficient cooling effect on the powder.

Abstract: The invention relates to a method for filling a capsule under rotation and a machine for carrying out the method. The capsule is rotated at a variable speed during the filling so that the centrifugal force at the inner surface of powder present in the capsule is essentially equal to the gravity. The centrifugal machine comprises a holder for the capsule and a drive structure by which the holder is driven at variable speed. The amount of supplied powder is measured and the speed is controlled in dependence on the output signal generated by the measurement.

Abstract: A holding force for retaining a billet and die against a die support is obtained by forming a pressure drop in the pressure medium flow in a gap between the billet and a surrounding constructional element inside the pressure chamber. The gap may be formed by the outer surface of the billet and the inner surface of the high pressure chamber. The gap may also be formed between the outer surface of the billet and the inner surface of a spacing tube mounted within the pressure chamber. The spacing tube is constructed with a portion having a smaller diameter than the remainder of the spacing tube to provide a gap to achieve a sufficient pressure drop for retaining the billet and die against the die support.

Abstract: In a press for hydrostatic extrusion, the die has a conical inlet portion and a portion forming a die opening. The die has draining channels which bypass the smallest cross-section of the die opening for the purpose of intercepting and diverting pressure medium which accompanies the billet as it moves down towards the smallest cross-section of the die. This removes any pressure medium which might otherwise pass through the die opening and damage the surface of the extruded article.

Abstract: A press for hydrostatic extrusion includes a pressure chamber for enclosing a pressure medium which is formed of a high pressure cylinder, a pressure generating piston, a die and a die support and seals. The die support includes an exchangeable support ring which engages the end surface of the liner and bridges the gap between the liner and the die. A metallic sealing ring is arranged within the liner in engagement therewith, forming a gap between the inner surface of the sealing ring and the outer surface of the die or die support. The die support has a groove in its upper surface which contains a sealing member against which the edge of the metallic sealing ring engages. The lower outer corner of the metallic sealing ring is bevelled to form a space which communicates with the outside of the press.

Abstract: A press for hydrostatic extrusion includes a pressure chamber for enclosing a pressure medium which is formed of a high pressure cylinder, a pressure generating piston, a die and a die support and seals. The die support includes an exchangeable support ring which engages the end surface of the liner and bridges the gap between the liner and the die. A metallic sealing ring is arranged within the liner in engagement therewith, forming a gap between the inner surface of the sealing ring and the outer surface of the die or die support. The die support has a groove in its upper surface which contains a sealing member against which the edge of the metallic sealing ring engages. The lower outer corner of the metallic sealing ring is bevelled to form a space which communicates with the outside of the press.

Abstract: A press for hydrostatic extrusion includes a pressure chamber for enclosing a pressure medium which is formed of a high pressure cylinder, a pressure generating piston, a die and a die support and seals. The die support includes an exchangeable support ring which engages the end surface of the liner and bridges the gap between the liner and the die. A metallic sealing ring is arranged within the liner in engagement therewith, forming a gap between the inner surface of the sealing ring and the outer surface of the die or die support. The die support has a groove in its upper surface which contains a sealing member against which the edge of the metallic sealing ring engages. The lower outer corner of the metallic sealing ring is bevelled to form a space which communicates with the outside of the press.

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 press for hydrostatic extrusion includes a pressure chamber for enclosing a pressure medium which is formed of a high pressure cylinder, a pressure generating piston, a die and a die support and seals. The die support includes an exchangeable support ring which engages the end surface of the liner and bridges the gap between the liner and the die. A metallic sealing ring is arranged within the liner in engagement therewith, forming a gap between the inner surface of the sealing ring and the outer surface of the die or die support. The die support has a groove in its upper surface which contains a sealing member against which the edge of the metallic sealing ring engages. The lower outer corner of the metallic sealing ring is bevelled to form a space which communicates with the outside of the press.

Abstract: In isostatic hot pressing of powder in a collapsible container, the powder is enclosed in a container which is provided with one or more evacuation openings, and a conical support is held in position adjacent the evacuation openings. A funnel-shaped body of sheet metal is secured above the support and the evacuation openings by welding its edge to the wall of the container. The body is evacuated through a suction tube connected to the funnel and the tube is sealed. Thereafter the container is subjected to heat and pressure, and the funnel-shaped member collapses into engagement with the conical support.