Abstract
In this article, cubic boron nitride (CBN) and coated carbide tools were used for finish turning of hardened steel with continuous and interrupted surfaces. The objective of this work is to investigate the conditions under which carbide tools can give optimal results in terms of both tool wear and surface integrity of the machined surface in comparison to costly CBN tools. The turning performance was evaluated in terms of maximum flank wear of the tools as well as surface integrity issues of the machined surface like white layer formation, microhardness decrease, and surface roughness increase. The results indicated that the longest tool life was achieved with CBN tool, but the accumulated machining time of all the four cutting edges in carbide tool was comparable with that of CBN tool. Significant affect of surface interruptions on tool life of carbide tool was observed, while life of CBN tool was not much affected by surface interruptions. The surface integrity achieved with carbide tools was comparable with that of CBN tools. The surface roughness value observed with both tools was below 1.6 µm. No white layer was observed while turning the interrupted and fully interrupted surfaces with both tools.
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