Investigation of Surface Roughness and Flank Wear by CBN and PCBN Tools on Hard Cr - Mo Steel

Hard turning is the latest technology and is used to turn hard materials by using cutting tools like CBN and PCBN. Certain hard materials like titanium, Inconel and stainless steel are pronounced as difficult to cut materials. The superior cutting tools effectively machine such hard materials and produces desirable surface roughness with less tool wear. The present research was carried on hard Cr -Mo alloy steel namely SCM 440 material by turning process. The hardness of the work materials were maintained between 45 to 55 HRC. The CBN produced low surface roughness and PCBN tool produced high surface roughness. The formation of crater wear was less in PCBN tool than CBN tool. Build up layer (BUL) was due to diffusion of work material on CBN and PCBN tools. PCBN tool withstand heat better than CBN. Formation of built up edge (BUE) is concern on PCBN tool and is less than CBN tool.