Study of the surface integrity and heat measurement of hard turning of hard chrome coated EN24 substrate

摘要

The principal aim of this paper is to hard turn the hard chrome plated EN24 substrate using TiAIN coated PcBN inserts. The variables used for the experimentations are the spindle speed, feed, depth of cut, nose radius and cutting edge angle. EN24 substrate was coated with hexavalent chrome to a thickness of 170 μm. The surface hardness before and after hard turning of hard chrome plated surfaces were studied. The temperature developed on the insert, workpiece and chips were studied in the present investigation. An experiment was carried out to determine the maximum heat development on the insert. The experimental results revealed that the maximum heat was observed at 2mm from the cutting edge on the top diagonal. The images obtained from the confocal microscope and scanning electron microscope discovered the nature of fracture of the chips from the work surfaces.