FIELD: deformation strengthening of parts such as bodies of revolution by means of steel balls in different branches of industry. SUBSTANCE: apparatus includes housing, stepped concentrator and working chamber. The last includes casing and opening provided in less step of concentrator. Apparatus also includes mechanism for moving parts through working chamber. In order to transmit kinetic energy to steel balls, they are subjected to action of ultrasonic field created in closed space due to exciting in walls of working chamber elastic ultrasonic-frequency oscillations. EFFECT: enhanced efficiency of apparatus. 1 dwg
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