Abstract
The present paper investigates the cutting parameters pertaining to the turning of X2CrNi18-09 austenitic stainless steel that are studied and optimized using both RSM and desirability approaches. The cutting tool inserts used are the CVD coated carbide. The cutting speed, the feed rate and the depth of cut represent the main machining parameters considered. Their influence on the surface roughness and the cutting force are further investigated using the ANOVA method. The results obtained lead to conclude that the feed rate is the surface roughness highest influencing parameter with a contribution of 89.69%.The depth of cut and the feed rate are further identified as the most important parameters affecting the cutting force with contributions of 46.46% and 39.04% respectively. The quadratic mathematical models presenting the progression of the surface roughness and the cutting force and based on the machining parameters considered (cutting speed, feed rate and depth of cut) were obtained through the application of the RSM method. They are presented and compared to the experimental results. Good agreement is found between the two sections of the investigation. Furthermore, the flank wear of the CVD-coated carbide tool (GC2015) is found to increase with both cutting speed and cutting time. A higher tool life represented by t=44min is observed at cutting speed, feed rate and depth of cut of 280m/min,0.08mm/rev and 0.2mm respectively. Moreover and at low cutting speeds, the formation of micro weld is noticed and leads to an alteration of the surface roughness of the work piece. Finally, optimizing the machining parameters with the objective of achieving an improved surface roughness was accomplished through the application of the Desirability Function approach. This enabled to finding out the optimal parameters for maximal material removal rate and best surface quality for a cutting speed of 350m/min, a feed rate of 0.088 mm/rev and a depth of cut of 0.9mm.
Highlights
The X2CrNi18-09 Austenitic Stainless Steel (ASS) is an alloy having strategic qualities represented essentially by a good resistance to corrosion and formability along with numerous non-magnetic properties
The influence of the cutting conditions on Ra, Fc, Kc, Pc and material removal rate (MRR) obtained from the turning of ASS
The cutting parameters adopted in the confirmation tests of turning are displayed in Table 8 while the results gathered are shown in Fig.11 where a comparison of the predicted values resulting from the application of the model developed and the experimental data is performed
Summary
The X2CrNi18-09 Austenitic Stainless Steel (ASS) is an alloy having strategic qualities represented essentially by a good resistance to corrosion and formability along with numerous non-magnetic properties. They concluded that feed rate was the most impacting parameter over the surface roughness along with the cutting speed and the depth of cut In their investigations concerning dry turning using coated carbide tools on duplex stainless steel while applying the RSM method (Response Surface Methodology), M. SenthilKumar et al [15] investigated the machining performance indicators represented by the tool wear, surface roughness, cutting zone temperature and force during hard turning of super duplex stainless steel using uncoated carbide tool Their experimental results showed that the feed rate is the most dominating factor that influences the surface roughness, while the cutting zone temperature and the force act along the ‘x’ axis. A complementary confirmation test is performed to evaluate the predicted models
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