Performance of mixed ceramics and CBN tools during hard turning of martensitic stainless steel
International Journal of Advanced Manufacturing Technology
School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Private Bag 3, Wits, Johannesburg, South Africa; Department of Process Engineering, University of Stellenbosch, Private Bag X1, Matieland, Stellenbosch, South Africa; Castco Precision Castings, P.O. Box 19133, Tygerberg, South Africa
This paper describes the wear behavior of a ceramic and a PcBN cutting tool during the turning of AISI 440B stainless steels at different machining conditions. Experimental results showed that the wear mechanism for ceramic cutting tool is predominantly abrasive wear and for cBN tools was adhesive wear and abrasive wear. The abrasive wear is as a result of hard carbide particles in the workpiece material resulting in grooves formed on the flank face. There was formation of transferred layer followed by plastic deformation on the rake face of PcBN tool when cutting at low speed and feed rate. Better surface finish (Ra) was recorded for ceramics but with deteriorating surface topography. The results also show that good dimensional accuracy can be achieved with cBN tools using CNC machine with high static and dimensional stiffness coupled with high-precision hard turning. © 2014, Springer-Verlag London.
Abrasion; Abrasives; Carbides; Ceramic cutting tools; Ceramic materials; Computer control systems; Cubic boron nitride; Cutting tools; Machinery; Martensitic stainless steel; Surface topography; Tribology; Dimensional accuracy; Hard turning; Machining conditions; Mixed ceramic; PcBN; PCBN cutting tools; Transferred layer; Workpiece materials; Stainless steel