Machining of Austenitic Stainless Steel Under Various Cooling-Lubrication Strategies Smita Padhan, Ajay Kumar Behera, and Sudhansu Ranjan Das Abstract



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Experimental Setup and Procedure
To achieve the objectives, the experiments were conducted by turning a cylindrical bar of Nitronic 60 austenitic stainless steel (diameter 50 mm, length 500 mm) as work material. The turning experiments were conducted on an HMT made high accuracy robust lathe having maximal power rating of 11 kW and highest speed limited to 2050 rpm. The cutting tool applied in the experiments is a KYS30 grade new generation SiAlON ceramic insert manufactured by Kenametal in the form of
SNMG 120,412. During the turning operation, the ceramic insert is rigidly clamped to an ISO standard toolholder having description of PSBNR2020K12. Principal cutting

Machining of Austenitic Stainless Steel force (Fc) is measured with the B piezoelectric dynamometer manufactured by
Kistler. A roughness tester (model Surftest SJ, manufactured by Mitutoyo)
is used to measure the roughness value (Ra) of machined component after each experimental run. A high-resolution digital imaging microscope (model Axiotech
100HD-3D) manufactured by Carl Zeiss was employed to measure tool wears on rake as well as flank surface of the tool insert after completion of each experimental trial.
FLUKE made Ti infrared thermal imaging camera was employed to monitor the cutting temperature at the interface of workpiece and cutting edge of tool. A JSM-
6084LV model scanning electron microscope (make JOEL) was used to perform microstructural analysis of machined surface and worn-out tool after the turning experiment. Figure
1
depicts the experimental setup and work methodology followed by the present machinability investigation. The output responses considered in this study are surface quality, tool wear on both flank and rake face of insert, principal cutting force and machining zone temperature. The details of all input cutting factors and cutting condition taken in this study were summarized in Table
1
Fig. 1 Schematic representation of proposed methodology and experimental setup layout

S. Padhan et al.
Table 1 Details of cutting process variable and their levels
Input parameters
Range
Axial seed (mm/rev)
0.12, 0.16, 0.20, Machining speed (m/min)
51,67,87,111
Depth of cut (mm)
0.4
Cutting duration (s)
120
C/L strategy
MQL, flooded, compressed air-cooled, and dry

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