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Semi-Continuous Hydrostatic Extrusion of Composite Conductors
Abstract Many high current density conductors are made of composites which are difficult to fabricate into wire due to their limited ductility. For decades, hydrostatic extrusion has been used for processing of materials where the high compression deformation environment induces extended ductility, but the practical application of the technique has been limited. In conventional hydrostatic extrusion the entire volume of material being processed must be loaded into the pressure chamber at one time limiting the starting material to chamber length billets or to small diameter wires which can be coiled and loaded into the chamber on spools. This paper describes experiments with semi-continuous hydrostatic extrusion tooling in which a starting bar of up to 20mm (.8 in.) diameter and any length can be hydrostatically extruded at fluid pressures up to 1450 MPa (210 ksi). A portion of the bar is advanced into the unpressurized chamber, gripped, the chamber pressurized, a short length of material is extruded, the pressure is relieved and the grip released to begin another cycle. Avoiding the potential for defect formation associated with the stop-start extrusion processing cycle is discussed.
Semi-Continuous Hydrostatic Extrusion of Composite Conductors
Abstract Many high current density conductors are made of composites which are difficult to fabricate into wire due to their limited ductility. For decades, hydrostatic extrusion has been used for processing of materials where the high compression deformation environment induces extended ductility, but the practical application of the technique has been limited. In conventional hydrostatic extrusion the entire volume of material being processed must be loaded into the pressure chamber at one time limiting the starting material to chamber length billets or to small diameter wires which can be coiled and loaded into the chamber on spools. This paper describes experiments with semi-continuous hydrostatic extrusion tooling in which a starting bar of up to 20mm (.8 in.) diameter and any length can be hydrostatically extruded at fluid pressures up to 1450 MPa (210 ksi). A portion of the bar is advanced into the unpressurized chamber, gripped, the chamber pressurized, a short length of material is extruded, the pressure is relieved and the grip released to begin another cycle. Avoiding the potential for defect formation associated with the stop-start extrusion processing cycle is discussed.
Semi-Continuous Hydrostatic Extrusion of Composite Conductors
Austen, A. R. (author) / Hutchinson, W. L. (author)
1990-01-01
8 pages
Article/Chapter (Book)
Electronic Resource
English
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