Actual Problems in Machine Building. Vol. 13. N 3-4. 2026 Innovative Technologies in Mechanical Engineering ____________________________________________________________________ 50 STUDY OF THE INFLUENCE OF THE FRICTION COEFFICIENT ON THE ROUGHNESS OF THE RESULTING SURFACE DURING MACHINING OF WORKPIECES MADE OF TN‑1 ALLOY Kisel’ A.G.1, Ph.D. (Engineering), senior researcher, e-mail: kisel1988@mail.ru Tselikov P.V.2, Post-graduate Student, e-mail: Patersort@list.ru 1Togliatti State University, 14 Belorusskaya St., Togliatti, Samara Region, 445020, Russian Federation 2Kaliningrad State Technical University, 1 Sovetsky Prospekt, Kaliningrad, 236022, Russian Federation Abstract This paper presents a study of the influence of machining parameters on both the resulting surface roughness and the friction coefficient arising in the machining zone during turning of a TN1 nickel–titanium (nitinol) workpiece. The goal was to identify the relationship between machining parameters, the resulting friction, and the resulting surface roughness. To achieve this goal, experimental studies were conducted to determine the chip reduction coefficient, which was then converted into the friction coefficient, and the roughness parameter Ra under various machining conditions. It was established that there is no direct relationship between the friction coefficient and the resulting roughness. By constructing empirical relationships, it was determined that for each of the feed rates used, as the friction coefficient increases, the resulting roughness increases logarithmically. An algorithm for predicting surface roughness based on the chip reduction coefficient was developed. It is indicated that roughness prediction is necessary for subsequent stages of part manufacturing using finishing methods such as rolling and burnishing. Keywords machining, roughness, friction coefficient, cutting speed, feed rate, depth of cut, surface plastic deformation (SPD)
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