超音波付加による押出し荷重の低減

Abstract

Ultrasonic vibration is applied to the extrusion process. When ultrasonic vibration is applied on the die in the backward extrusion of pure aluminum at room temperature, the load is reduced to 40% of that without ultrasonic vibration. The plastic deformation zone appears concentrated just under the die compared with that in the extrusion without ultrasonic vibration. On the other hand, the reduction in the load was small in the case in which ultrasonic vibration is applied to the stem in the forward extrusion. It is estimated that in the backward extrusion, the material just under the die is easily deformed and flowed out to the die exit because the free exit space is just on the side of the vibrating die.