首页|Enhancement of plastic flow in lateral direction by torsional oscillation in upsetting and lateral extrusion
Enhancement of plastic flow in lateral direction by torsional oscillation in upsetting and lateral extrusion
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NSTL
Elsevier
Plastic flow of hollow cylinders under combining axial compression with torsion was examined in upsetting and in lateral extrusion. The hollow cylinders with initial height/outer diameter of 0.5-2.5 and initial inner/outer diameter of 0.3-0.9 were compressed/extruded and simultaneously twisted with respect to the axisymmetric forging axis in one-way or cyclic alternating. Due to superposition of torsional shear stress, the lateral metal flow was found to be assisted. Barreling of the workpiece was reduced by approximately 10 % in upsetting with torsion/compression speed of 6 degrees /mm. The enhancement of the plastic flow in upsetting was applied to fill up tooth cavity in lateral extrusion. The extruded tooth depth of the workpiece was approximately 5-7% larger in lateral extrusion with torsion/extrusion speed of 30 degrees /mm. In addition, cyclic alternating torsion was effective to extrude evenly in the tooth thickness direction due to the periodic reversal of die rotation in peripheral direction.
NSTL
Elsevier
