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The friction reversión mechanism during the ultrasonic vibration drawing (UVD) of wires has been detailed for the case when the die is located at the oscillation máxima of the waves and actuated parallel to the friction forcé direction. The decrease of the drawing forcé for the UVD technology as compared to classical drawing has been explained by means of the intermittent contact in the metal-die forming área. A relationship has been derived for the UVD friction coefficient, u u s that allowed the analytical determination of the drawing forcé. In the case of the Romanian RUL IV (AISI 52100) ball bearing steel wires, a good agreement has been found between the analytical and the experimental valúes of the drawing forces that have decreased, as compared to classical drawing, by more than 5 % for drawing rates lower than 0.66 m/s.

The metal-tool contact friction at the ultrasonic vibration drawing of ball-bearing steel wires