FRICTIONAL FORCE VECTOR REVERSAL AT METAL DRAWING WITH ULTRASONIC ACTIVATION OF THE TOOL

摘要

The paper presents the possibility to reduce the average drawing force in the technologies for obtaining tubes, rods and wires, when the tool is located in the oscillation maximum of the ultrasonic waves and actuated parallel to the drawing direction. This reduction is explained by the frictional force vector reversal during the time T/2-2t{sub}1 within a complete oscillation period, when v{sub}(tr)/v{sub}v<1. This fact justifies the use of ultrasonic energy in the plastic deformation processes of resistive to cold drawing metals.