Abstract
Experimental and analytical studies were carried out to clarify servo press slide motion preferable for obtaining uniform cups by one operation of impact extrusion. Cylindrical billets of aluminium (A1070) were extruded into cups by servo press. The inner and outer diameters were measured along the longitudinal axes. The effects of servo press slide motion on billet temperature were investigated by finite element method. The following results were obtained: 1) Effect of heat generation by processing on inner and outer diameters of cup was large. 2) If set to a constant sliding speed, inner and outer diameters became smaller as the bottom of the cup. 3) By slide speed in the middle of deceleration, the dimensional accuracy was improved.
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