Investigation of Cutting Tool Overhang Length Effect on Surface Roughness of Ggg70 Cast Iron

Abstract

In machining processes, in order to obtain good surface qualities, it is very important to choose the cutting tool and cutting conditions. In addition, the rigidity of the cutting tool and workpiece fixture systems also majorly affects the surface quality. Numerous studies have been investigated the effect of cutting speed, feed and cutting depth parameters on the machining process. However, there are more limited studies investigating the effect of cutting tool overhang length. In this study, the effects of cutting tool overhang length on the surface roughness of austempered GGG70 cast iron material were investigated in the milling process. In this context, cutting speed, feed rate, cutting depth and number of passes were kept constant and milling was carried out at cutting tool overhang lengths of 2, 2.5, 3, 3.5, 4, 4.5 and 5 times the tool diameter (16 mm). The milling experiments performed with three repeated. As a result of experiments, the surface roughness obtained of 0.383 µm at 32 mm tool overhang length. The surface roughness increased to 0.547 at 80 mm tool overhang length. So, the surface roughness increased by 42.6% with the increase of the tool overhang length. In addition to the critical parameters, it has been observed that parameters such as tool overhang have a significant effect on the surface roughness.