Title: Hard turning of GCr15 steel with chamfered PCBN tools

Authors: Tao Chen; Xianli Liu; Suyan Li

Addresses: School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin 150080, China ' School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin 150080, China ' School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin 150080, China

Abstract: This work investigates the cutting performance of chamfered PCBN tools in hard turning of GCr15 bearing steel. Experimental study was performed on a NC lathe. Cutting forces were measured by using a dynamometer. Cutting temperature was measured by using an infrared thermal imager. The variation of cutting forces and cutting temperature with the chamfer angles are investigated and discussed. The surface roughness of the workpiece and flank wear of the tool during the machining is concerned, and the relationship between the surface roughness and flank wear is studied. The tool rejection criteria for the hard turning of GCr15 steel is proposed considering surface roughness and flank wear. The wear patterns of the tool were investigated using scanning electron microscope (SEM), and the wear mechanism is discussed. It is found that crater and adhesion are the dominant wear mechanism of the rake face, and abrasive wear is the dominant wear mechanism of the flank of the PCBN tool in hard turning of GCr15 steel. [Received 4 January 2012; Revised 16 April 2012; Accepted 25 June 2012]

Keywords: hard turning; bearing steel; PCBN tools; cutting force; cutting temperature; tool wear; flank wear; surface roughness; surface quality.

DOI: 10.1504/IJMR.2013.053287

International Journal of Manufacturing Research, 2013 Vol.8 No.2, pp.196 - 206

Published online: 29 Jan 2014 *

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