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TECHNIQUES FOR EXTRUSION OF SMALL-DIAMETER REFRACTORY METAL TUBE BLANKS

W.R. Jr. Burt, R. M. Mayfield

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Abstract

An alternate approach to mandrel extrusion was investigated for extruding a tube with an ID of 1/2 in. or smaller. A co-extrusion technique that incorporates an internal core in the billet that reduces proportionately with the refractory metal sleeve is discussed. The advantages and disadvantages of mandrel-less extrusion techniques and relation of mandrel-less extrusion techniques to secondary fabrication operations are discussed. It was concluded that use of a co-extrusion technique with a deformable core material eliminates the use of a mandrel, ID contamination and lubrication, and results in a smaller diameter extruded tube. (P.C.H.)

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An alternate approach to mandrel extrusion was investigated for extruding a tube with an ID of 1/2 in. or smaller. A co-extrusion technique that incorporates an internal core in the billet that reduces proportionately with the refractory metal sleeve is discussed. The advantages and disadvantages of mandrel-less extrusion techniques and relation of mandrel-less extrusion techniques to secondary fabrication operations are discussed. It was concluded that use of a co-extrusion technique with a deformable core material eliminates the use of a mandrel, ID contamination and lubrication, and results in a smaller diameter extruded tube. (P.C.H.)

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Available abstract

An alternate approach to mandrel extrusion was investigated for extruding a tube with an ID of 1/2 in. or smaller. A co-extrusion technique that incorporates an internal core in the billet that reduces proportionately with the refractory metal sleeve is discussed. The advantages and disadvantages of mandrel-less extrusion techniques and relation of mandrel-less extrusion techniques to secondary fabrication operations are discussed. It was concluded that use of a co-extrusion technique with a deformable core material eliminates the use of a mandrel, ID contamination and lubrication, and results in a smaller diameter extruded tube. (P.C.H.)

Key concepts: Mandrel, Extrusion, Tube (container), Materials science, Core (optical fiber), Composite material, Lubrication, Fabrication

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