The Influence of the Direction and Geometry of the Working Tool on the Stress-Strain State of Cylindrical Parts in Oscillating Burnishing

The finishing and hardening technology for cylindrical parts of the shaft type by oscillating burnishing is considered in this article. Using computer simulation, a finite element model of oscillating burnishing is developed to determine the stress-stain state in the deformation zone and the hardened parts depending on the rotational angle and the profile radius of the working tool. An increase in the profile radius from 1 to 8 mm results in an increase in the maximum residual equivalent compressive stresses by 45 %. With a positive rotational angle of the tool (when its direction coincides with the direction of the longitudinal feed), equal 45°, the residual compressive stresses reach the minimum value. When the rotational angle of the tool is increased from –30° to –88° in the direction opposite to the direction of the longitudinal feed, the residual stresses increase sharply, and the quality of the surface layer deteriorates. The depth of the hardened layer can vary by 34 % for different profile radii of the deforming tool, and by 70–75 % at different rotational angles of the tool.

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