Investigation of sequential cryogenic hard turning and ball burnishing processes

Abstract

This paper presents a sequential machining process which incorporates CBN hard turning with cryogenic pre-cooling of the workpiece (CHT) and ball burnishing (BB). The main goal of this study was to select machining conditions enhancing the quality of parts machined by hard turning including the surface roughness Ra of about 0,2 μm, good bearing properties and reducing the white layer. Changes of surface roughness, surface texture, microstructure alterations and micro-hardness distribution are discusses.

Keywords

• cryogenic hard turning
• ball burnishing
• CBN tool
• hardened alloy steel