Behavior of the magnetic abrasive tool for cutting edge preparation of cemented carbide end mills

Magnetic abrasive processes combine characteristics of grinding and lapping. Due to deformable tool behavior, complex surface shapes and edges can be machined. Therefore, this process is predestined for preparation of drilled cutting tools. High quality finishing results require in depth process expertise. This paper focuses on the behavior of the magnetic abrasive tool taking Magnetfinish^® kinematics into account. Main characteristics of the magnetic abrasive tool behavior during finishing end mills of 12 mm diameter are reshaping and in-process densification of magnetic abrasive layer. Consequently, flute surface modifications occur only in the cutting edge surrounding area. Furthermore, in-process displacements of magnetic abrasive cause non-uniform cutting edge rounding. SEM images indicate abrasive motion along the cutting edge as the best method to obtain smooth cutting edge surface.