INVESTIGATION OF MACHINABILITY IN Co AND Cr CONTAINING HARD MATERIALS HEATED BY PLASMA ARC

Abstract

Turning soft materials is not a problem in these days. But machinability of hard materials have been necessary. A lot of research has been done on machinability of difficult-to-cut materials. The aim of the present study is toinvestigate the machinability of three of hard materials after heating and softening. In this study for machining difficult-to-cut materials, different heating processes were applied and for heating, lately developed plasma heating method was used. To cut the hard material heated by plasma arc, tungsten carbide cutting tool was used. In the study, three different hard materials have been used. These were ferritic steel with 14 % Cr, Ti added cast iron, 8.5 % Cr cast steel and Co-Cr-W alloyed steel which is called stellite 6 and used in the textile industry andat power stations. In this study cutting forces, wear of cutting tool and surface roughness were investigated.

Keywords

• Sıcak işlenebilirlik, İşlenebilirlik, Plazma arkı ile ısıtma, Yüksek kromlu çelikler