Evaluation of the topography and load capacity of cylindrical surfaces shaped in the process of finish turning of the Inconel 718 alloy

Abstract

The paper presents a comparison of the topography and load capacity of a surface obtained after longitudinal turning of the Inconel 718 alloy with the use of ceramic and carbide cutting inserts with the same geometry. The tests have been performed applying variable values of the feed and cutting speed. Topography measurements have been performed on the Nanoscan 855 device. The results presented in the work show that the ceramic inserts applied in turning the nickel alloy allow for obtaining a surface with similar or even lower roughness parameters than those obtained with sintered carbide inserts provided with an anti-wear coating although ceramic inserts show higher values of the roughness parameters on the rake face and flank face. The lowest values of the Sa and Sq parameters have been recorded on surfaces machined with an insert of 6160 ceramic for the cutting speed of vc = 250 m/min at the feeds of f = 0.025 mm/rev and f = 0.04 mm/rev. The application of higher cutting speeds for the individual tool materials had an advantageous influence on the distribution of the profile ordinates and, consequently, on the form of the Abbott Firestone curve.