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Volume 14, September 2017, Pages 10-31
Performance evaluation of PCBN, coated carbide and mixed ceramic inserts in finish-turning
of AISI D2 steel
M. Junaid Mir, M.F. Wani
Centre for Tribology, Department of Mechanical Engineering, National Institute of Technology Srinagar, 190006 India
Abstract
The
present study compares the performance of three different cutting
tools, viz., PCBN, mixed ceramic and coated carbide tool in finish
turning of hardened D2 tool steel in terms of tool wear, surface
roughness, and economic feasibility under dry cutting conditions.
Results showed that tool life of PCBN inserts was better than mixed
ceramic and coated carbide inserts. The flank wear of PCBN tools was
observed to be lower than mixed ceramic and coated carbide inserts.
The surface roughness achieved under all cutting conditions for
mixed ceramic and coated-carbide inserts was comparable with that
achieved with PCBN inserts and was below 1.6μm. Experimental results
showed that the wear mechanism of ceramic tool is pre-dominantly
abrasive wear at lower speeds and abrasive wear followed by adhesive
wear at medium and higher speeds and for PCBN tools the dominant
wear mechanism is abrasive wear and cratering at lower speeds
followed by adhesive wear at higher speeds. For carbide tool the
dominant wear mechanism was abrasive wear and cratering at lower
speeds followed by adhesion and chipping at higher speeds. Obtained
results revealed that PCBN tools can outperform both ceramic and
carbide tools in terms of tool life under different machinability
criteria used.
Keywords
Hard turning; PCBN; Coated carbide; Tool life; Surface roughness; Economic analysis
Full Text
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