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E. CHIRILĂ1,* , M. SUSAN1, B. – L. GAVRILĂ1, V. BULANCEA1
The paper presents the influence of the ultrasounds surface effect up the drawing force and up the mechanical characteristics of resistance and plasticity, at the processing of the thin walls tubes made of X5CrNi18-10 / EN 1008-3 / 2005, in ultrasound field / UVD system. The drawing force is measured with the drawing cell, a CT-A-KN1C one, (during the process of plastic deformation by drawing) and the mechanical characteristics of resistance and plasticity are determined by tension stress on samples made of classic processed tube (CT) and of ultrasonic processed tube (UVD) – accordingly with EN 10002-2-1995. The ultrasounds surface effect or the effect of the metal-tool contact friction reduction / Severdenko’s model, is explained based on the mechanism of the mean friction reversal at the level of one complete time of the oscillation (T), assuming a Coulomb type friction. As a reduction measure of the friction at the metal-tool contact is the reduction coefficient of the mean friction (φ) – as a function of the relative rate of drawing ( vdr / vv ), where dr v is the rate of drawing and v v is the vibratory rate of the die. The results important to be considered are for dr v v / v << 1.0..
Ultrasounds surface effect, Reduction coefficient of the mean friction, Thin walls tubes made of stainless steel, Drawing force, Mechanical characteristics of resistance and plasticity.
E. CHIRILĂ, M. SUSAN, B. – L. GAVRILĂ, V. BULANCEA, Influence of the ultrasounds surface effect at the ultrasonic drawing of the thin walls tubes made of stainless steel, Optoelectronics and Advanced Materials - Rapid Communications, 8, 11-12, November-December 2014, pp.1129-1134 (2014).
Submitted at: Jan. 29, 2014
Accepted at: Nov. 13, 2014
Optoelectronics and Advanced Materials - Rapid Communications
(2022): 0.5 - 2022 Journal Citation Reports (Clarivate Analytics, 2023)
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