INFLUENCE OF SIDE CUTTING EDGE ANGLE ON THE DESIGN OF THE CHIPBREAKER: STUDY OF DYNAMIC AND HIGH FEED TURNING TOOLS IN INCONEL® 718

Abstract

Dynamic turning is a recent technology that allows inserts with different cutting edges to be used and the side cutting edge angle to be modified by controlled spindle rotation and synchronised variation of the cutting parameters. This makes it possible to eliminate downtime by reducing tool changes. Chip breaking is a relevant fact in the turning of aeronautical parts, as it allows a higher heat dissipation performance when working with heat-resistant superalloys, materials that degrade inserts rapidly. An initial study has been carried out, using different fixed side cutting edge angles, to test the chipbreaker performance of an experimental dynamic turning insert in order to adapt its design to the machining of aeronautical components, obtaining that, although the cutting performance is good, the chipbreaker does not perform correctly in finishing conditions, and therefore it must be redesigned by reducing its distance to the cutting edge. Keywords: dynamic turning; high feed; aerospace superalloy; chipbreaker, side cutting edge angle.