Actual Problems in Machine Building 2015 No. 2

Actual Problems in Machine Building. 2015. N 2 Innovative Technologies in Mechanical Engineering ____________________________________________________________________ 168 SELECTION OF DEFORMER MATERIALS FOR STRENGTHENING FINISH MACHINING BY ULTRASONIC TOOLS Gileta V.P., Ph.D. (Engineering), Associate Professor, e-mail: gileta.viktor@yandex.ru Beznedelnyy A.I., Ph.D. (Engineering), Associate Professor, e-mail: beznedelnyy@corp.nstu.ru Asanov V.B., Ph.D. (Engineering), Associate Professor, e-mail: asanov@ corp.nstu.ru Novosibirsk State Technical University, 20 Prospect K. Marksa, Novosibirsk, 630073, Russian Federation Abstract The effect of workpiece and tool materials, a cutting fluid and ultrasonic surface plastic deformation on tool wear and the quality of the part surface is studied. It is revealed that tool wear adversely affects microgeometric and physical-mechanical characteristics of the surface layer. The materials of high hardness (in particular, hardened steel) have the highest abrasive ability during surface plastic deformation by an ultrasonic tool. The lowest wear of the tested tool steels and the VC and TC hard alloy groups have the VK8 and VK4M hard alloys. The machining modes, namely, the speed, the static load and the vibration amplitude affect tool wear significantly. The dependence of hard alloy tool wear on the speed is extreme regardless of the static effort and vibration amplitude. The speed corresponding to the minimal wear is basically determined by the vibration amplitude and practically does not depend on the static load. An increase in the vibration amplitude and the static load leads to wear intensification. Based on these studies, some technological recommendations on the use of deformer materials for surface plastic deformation of machine parts made from various materials by an ultrasonic tool are given. Keywords surface plastic deformation by ultrasonic tools, deformer, wear, material, modes, surface layer quality, surface roughness, microhardness, static load, vibration amplitude and frequency, wear spot