Title: Experimental study on hard turning of hardened medium carbon steel with carbide insert under high-pressure coolant condition

Authors: Nusrat T. Chowdhury; M. Kamruzzaman; N.R. Dhar

Addresses: Department of Industrial and Production Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka 1000, Bangladesh. ' Department of Mechanical Engineering, Dhaka University of Engineering and Technology (DUET), Gazipur 1700, Bangladesh. ' Department of Industrial and Production Engineering, Bangladesh University of Engineering and Technology (BUET), Dhaka 1000, Bangladesh

Abstract: A basic difference of hard turning from conventional turning lies in its larger specific cutting forces requirements which in turn can be lowered by applying no cutting fluid. The beneficial effects of hard turning can be offset by excessive temperature generation which causes rapid tool wear or premature tool failure if the brittle cutting tools required for hard turning are not used properly. Under these considerations, the concept of high-pressure coolant (HPC) presents itself as a possible solution for high speed machining in achieving slow tool wear while maintaining cutting forces at reasonable levels, if the high pressure cooling parameters can be strategically tuned. This paper deals with an experimental investigation of some aspects of the turning process applied on hardened steel (HRC 56) using coated carbide tools at high cutting speeds under high-pressure coolant, comparing it with dry cut. The results indicate that the use of high-pressure coolant leads to reduced surface roughness, delayed tool flank wear, and lower cutting temperature, while also having a minimal effect on the cutting forces.

Keywords: high pressure coolant; HPC; hard turning; cutting temperature; cutting force; tool wear; surface roughness; surface quality; medium carbon steel; carbide inserts; high speed machining; flank wear.

DOI: 10.1504/IJMMM.2012.048558

International Journal of Machining and Machinability of Materials, 2012 Vol.12 No.1/2, pp.66 - 75

Available online: 16 Aug 2012 *

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