EFFECT OF DIAMOND BURNISHING PROCESS VELOCITY ON 41Cr4 STEEL SURFACE INTEGRITY

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  • TITLE: EFFECT OF DIAMOND BURNISHING PROCESS VELOCITY ON 41Cr4 STEEL SURFACE INTEGRITY
  • AUTHOR(S): V. P. Dunchev
  • ABSTRACT: Diamond burnishing (DB) is a static mechanical surface treatment process based on severe plastic deformation on the surface layer of the metal work-pieces. The main feature of the DB is that the tangential contact type between the diamond deforming element and the surface being treated - sliding friction contact. DB significantly reduces the roughness (up to mirror-finish surfaces), increases the surface micro-hardness, introduces the beneficial residual stresses and modifies the microstructure of the surface and subsurface layers in terms of grain refinement. Thus, DB dramatically improves the surface integrity (SI) of the metal components. The basic governing factors of the DB are the radius of the spherical-ended diamond, burnishing force, feed rate and burnishing velocities. This article presents the outcomes from the experimental investigation of the influence of sliding burnishing velocity on SI of 41Cr4 steel. It was established that the burnishing velocity influences slightly on the SI. The increased burnishing velocity leads to slightly decrease of the roughness obtained, slightly increase of the surface micro-hardness and a reduction of the surface axial residual stresses; in contrast with the residual axial stresses, the residual surface hoop stresses increase.
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