Análise da estampagem incremental em placas de aço inoxidável AISI 316L

Abstract

The present paper studied the formability of steel AISI 316L steel through the single point incremental forming (SPIF) process. The forming process was set up with a CNC milling machine, a 8mm diameter spherical working tool and a CAD / CAM software. This project investigated the influence of variations in the rotational speed of the working tool and in the lubricating fluid on the formability of this particular steel. Vegetable oil was applied at a minimum amount of lubricant, initially pure, at a flow rate of 5 mL / h and then graphite with 200nm average grain size was added at 10% in total weight. Tensile tests were performed to know the mechanical properties of the steel and the surface finish verified by roughness measurement followed with an optical microscope, thus the formability of the steel could be analyzed. The temperature was also monitored during the tests for being potentially influenced by the raise in shear between the steel plates and tool during the forming process, which could help evidence the influence of both parameter evaluated during the tests. With the roughness measured it is noted a decrease in surface finish quality with the increase of rotation and an increase in quality with the addition of graphite. The temperature results are different from what we expected.