OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 5 4 3 (hereafter referred to as “coated”), single-layer PVD AlTiN coated and microblasted as a post-treatment (hereafter referred to as “coated-microblasted”), and multi-layer MTCVD TiCN/Al2O3 coated (hereafter referred to as “MTCVD”). At regular intervals along the length of the cut, flank wear was observed. Based on the results of the pilot tests, literature rewiev, and a manufacturer’s recommendation, cutting parameters were selected. Uncoated carbide inserts, marked in accordancewith ISO as CNMG120408MS, are coatedwith aluminum titanium nitride (AlTiN) by physical vapor deposition (PVD) with pre- and post-treatment as described in table 1. The CNMG120408 inserts, diamond-shaped with an 80° angle and 0.8 mm nose radius were rigidly mounted on a tool holder, marked in accordance with ISO as PCBNR2525M12, as shown in fig. 2. The machining parameters were selected after a thorough literature study, catalog review, and searching experiments. Experimental matrix is shown in table 2. Flank wear was measured using a Dino-Lite digital microscope. Tool life (T) is obtained with flank wear of 0.2 mm. Longitudinal turning tests were carried out on a reliable, high-precision CNC lathe. A strain gauge-type lathe dynamometer was used to measure tangential force (Fc), feed force (Ff) and radial force (Fr) during the machining process. A Taylor Hobson Surftronic tester is used to evaluate surface roughness. Fig. 1. Experimental set-up Fig. 2. Details of cutting insert and tool holder
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