Актуальные проблемы в машиностроении №2 2015

Actual Problems in Machine Building. 2015. N 2

Innovative Technologies

in Mechanical Engineering

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168

SELECTION OF DEFORMER MATERIALS FOR STRENGTHENING FINISH

MACHINING BY ULTRASONIC TOOLS

Gileta V.P.,

Ph.D. (Engineering), Associate Professor, e-mail:

Beznedelnyy A.I.,

Ph.D. (Engineering), Associate Professor, e-mail:

Asanov V.B.,

Ph.D. (Engineering), Associate Professor, e-mail: asanov@

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