Análise do desempenho de ferramenta de corte cerâmica texturizada a laser no torneamento do ferro fundido FC250 e do aço inoxidável VSM13

Abstract

This work aims to evaluate the performance of ceramic cutting tools based on aluminium oxide (Al2O3) textured by ultrashort pulse laser, in turning grey cast iron FC250 (short chip) and martensitic stainless steel VSM13 (long chip). For this purpose, straight textures on the rake face of cutting tools and parallel to the main cutting edge were manufactured. The textures were characterized in a 3D optical microscope. Machining force (Fu) was measured in the turning test, as well as the surface roughness (Ra and Rz parameters) and the circularity of the workpiece were evaluated. The changed input variables were tool (reference and textured) and feed rate (0.20 and 0.25 mm/rev). Microabrasion tribological tests were also performed with reference and textured ceramic material. The results showed a significant difference between tools in FC250 turning. Textured cutting tool provided an average Fu 41 N greater than the reference. Considering VSM13, only the feed rate significantly influenced Fu. Increasing the feed rate implies Fu on average 166 N greater. As for surface roughness and circularity deviation, only the feed rate influenced the output variables. Finally, in the microabrasion test, the reference surface showed wear resistance (K-1) 32% greater than the textured one. In general, the textured tool did not outperform the reference tool. However, it was less sensitive to the feed rate influence for both evaluated workpiece materials. The grooves function as an abrasive reservoir in the tribological test, decreasing the wear resistance.