Abstract
AbstractHard turning is performed by manufacturing industries for its applications to achieve the required machining surface characteristics by eliminating finishing processes such as cylindrical grinding. Hard turning is widely used in the fields of automotive and aerospace industries. The objective is to investigate the surface characteristics of different hardened steels AISI 1018 (35 ± 1 HRC), AISI 4140 (43 ± 1 HRC), AISI D2 (50 ± 1 HRC), and AISI H13 (60 ± 1 HRC) steel using the wiper carbide insert with designation (WNMG060408MW), cemented carbide insert (TiCN/Al2O3) with designation (CNMG120412MR), ceramics insert with designation (CNGA433T0820), and carbide insert with designation (CNMG120404B) under the dry turning conditions. The hardness of selected material is tested using the Rockwell Hardness Tester. The experiment was conducted on the CNC Lathe Galaxy Midas-6 model. The significant parameters are cutting speed, hardness of workpieces, feed, depth-of-cut, and type of inserts are considered as input parameters, and surface roughness, tool wear, tool wear rate, MRR “material removal rate”, and cutting temperature are considered as output response parameters. DOE using Taguchi's L16 orthogonal array with five factors and four levels was selected. The experimental results reveal that the type of insert, cutting speed, and workpiece hardness are the important significant parameters in the surface characteristics of the workpiece along with the feed rate and depth-of-cut. The workpiece hardness and depth-of-cut play a significant role in tool wear followed by the type of insert, cutting speed, and feed. The workpiece’s hardness, insert type, and time to complete the hard turning operations play a major role in cutting temperature. The optimization result reveals that the VIKOR optimization is best suitable for multi-criteria decision making optimization.KeywordsHard turningVIKOR optimizationDry turningTool wearMRR—“material removal rate”Tool wear rateSurface roughness (Ra)
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