Abstract

This paper deals with the experimental examination of surface micro-hardness improvement ratio in burnishing of external cylindrical workpieces. The material of the examined workpiece was AISI 304 austenitic stainless steel. In our experiments, we investigated the sliding frictional burnishing of an outer cylindrical surface when the burnishing tool had a diamond material-grade spherical tip. Using the full factorial experimental design technique, we aimed to determine how the changes in burnishing parameters, i.e., burnishing speed, burnishing feed, and burnishing force effect on the changes of surface micro-hardness and surface micro-hardness improvement ratio. Based on examinations, the best burnishing parameter combination could be selected.

Highlights

  • We investigated the sliding frictional burnishing of an outer cylindrical surface when the burnishing tool had a diamond material-grade spherical tip

  • Due to their increased corrosion resistance, stainless steels are widely used in various fields of engineering practice, such as food industry, chemical industry, and automotive industry

  • Sliding friction burnishing is kinematically similar to turning, but instead of the insert of the cutting tool, the deforming element is a large radius sphere tip that is moved by applying a certain amount of pressure to the surface to be machined

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Summary

INTRODUCTION

Due to their increased corrosion resistance, stainless steels are widely used in various fields of engineering practice, such as food industry, chemical industry, and automotive industry. The most common requirements for the surfaces of parts made of such steels are low roughness, high micro-hardness and wear resistance These requirements can largely be satisfied by the use of cold-plastic burnishing technologies. Sliding friction burnishing is kinematically similar to turning, but instead of the insert of the cutting tool, the deforming element is a large radius sphere tip that is moved by applying a certain amount of pressure to the surface to be machined. This creates a plastic deformation on the surface of the workpiece and in the layers close to the surface (Fig. 1) [1]. (steel, non-ferrous metal alloys), e) type of machined surface (outer cylindrical surfaces, inner cylindrical surfaces, flat surfaces, complex surfaces, discontinuous cylindrical surface), f) examination of process parameters (ironing force, ironing depth, feed, ironing speed, the number of passes, the lubricant, the radius of the spherical tool, the diameter of the cylindrical tool)

COLD FORMING MACHINING OF STAINLESS STEELS
EXPERIMENTAL CONDITIONS
Measuring of micro-hardness of the surface
Findings
SUMMARY AND DISCUSSIONS

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