The metal-tool contact friction at the ultrasonic vibration drawing of ball-bearing steel wires
DOI:
https://doi.org/10.3989/revmetalm.1999.v35.i6.646Keywords:
Ultrasonic vibration drawing, Friction reversión mechanism, Friction coefficient, Drawing force, Intermittent contactAbstract
The friction reversion mechanism during the ultrasonic vibration drawing (UVD) of wires has been detailed for the case when the die is located at the oscillation maxima of the waves and actuated parallel to the friction force direction. The decrease of the drawing force for the UVD technology as compared to classical drawing has been explained by means of the intermittent contact in the metal-die forming area. A relationship has been derived for the UVD friction coefficient, μUS that allowed the analytical determination of the drawing force. In the case of the Romanian RUL 1V (AISI 52100) ball bearing steel wires, a good agreement has been found between the analytical and the experimental values of the drawing forces that have decreased, as compared to classical drawing, by more than 5 % for drawing rates lower than 0.66m/s.
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