Study of Metal Forming in the Mashy State 2nd Report: Extrusion of Tube, Bar and Wire of Alloys in Mashy State
In order to investigate the general aspect of the mashy state extrusion, the authors made extrusion tests of Pb-alloy and Al-alloys, and uniaxial tensile tests and observation of the micro-structures of the extruded products were carried out. Results were as follows. (1) Bar, wire and tube were successfully extruded at high reduction with small force. (2) As the solid component decreased from 100% to 80~70% the extrusion pressure dropped to 1/4~1/5 of that for conventional hot extrusion. (3) When the solid fraction was lower than 80%, the effect of frictional force between billet and container or die was found to be almost negligible. (4) In order to attain the stable extrusion the residual solid fraction of product shuld be higher than 90~95%. (5) Depending on the decrease of solid fraction of billet, the tensile strength of the extruded product decreased, but the elongation was not affected seriously. (6) The micro-structure of the extruded product was generally fine and the fiber structure was hardly observed.
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