Effect of cutting parameters on experimental results in milling of cryogenic GGG 40 cast iron

Nodular graphite cast irons are a group of materials that combine the mechanical properties of steel and the ease of production of cast iron. It has about twice the strength of gray cast irons and is easier to cast than steel. In addition, due to its low production cost, its usage area is gradually expanding compared to steel and other cast irons. Casted GGG40 spheroidal graphite cast irons were used for this study. In the study, some GGG40 cast irons and inserts were cryogenically treated. After the applied cryogenic process, surface milling experiments were carried out using three different cutting inserts (TN6510, THM-U, TN6501), three different cutting speeds (280,360,480 m/min), and three different feeds (0.15, 0.35, 0.55 mm/tooth). The cutting depth was kept constant at 0.5 mm in the experiments. A total of 108 experiments were conducted using full factorial experimental design (33), 27 with normal material - normal cutting insert, 27 using normal material - cryogenic cutting insert, 27 using cryogenic material - normal cutting insert, and 27 using a cryogenic material - cryogenic cutting insert. During face milling operations, cutting temperatures, surface roughness after each test, and cutting-edge flank wear were measured by repeating the same experiment with a thermal camera. Experimental results were interpreted with analysis of variance and two and three-dimensional graphics. The experiments were also repeated for non-cryogenically treated materials and inserts, and the obtained data were compared for cryogenic and normal materials. In addition, considering the obtained data, the cutting parameters of the desired experimental results were examined.