CORRELATION BETWEEN MACHINABILITY BY CLASSICAL MACHINING METHODS AND USE OF NONCONVENTIONAL TECHNOLOGIES

Between the machinability by classical machining methods and use of nonconventional technologies there is a certain correlation. When the machining by classical methods is not possible or it is difficult to be applied, one can took into consideration the use of nonconventional technologies. The documentary research showed that that the empirical models corresponding to the tool wear, cutting forces and roughness of the machined surface, considered also as machinability indexes, take into consideration characteristics of the workpiece material. In order to improve the conditions of developing a machinability evaluation by drilling under constant force feed, a machining schema involving the work feed movement of the test piece from up to down, to the rotating drilling tool, was proposed. The experimental research led to a power type empirical mathematical model able to highlight the influence exerted by the rotation speed, drilling tool diameter and the force feed on the length of hole achieved in a certain time.