Analysis of dry cutting in the process of face milling

According to standard DIN 8580 the milling process is classified into the third main group and, according to more detailed classification, into the subgroup ''cutting-off with tools'' whose cutters have a certain geometrical shape. The cutter describes a cycloid, the cut is interrupted and the thickness of cutting depends on the cutting angle. Control by the cutting-off process is very important for practice. With the introduction of demanding machining systems the requirement for reliable technological information [1] has been increased. This requires reliable analysis of conditions in the cutting zone (system of cutter - workpiece - chip). In this zone stresses, friction, high temperatures and deformations occur. Since the mechanics of the cut in this area are very complicated, this results in continuous intermingling of various technical laws, and so it is not possible to make any precise assumptions about their mutual influences. The use of coolants agents and lubricants during the cutting-off must be reduced for economical and ecological reasons. Also for technological reasons the abandoning of the use of coolants and lubricants is desirable, because in the case of interrupted cut, there is thermal shock and, as a result, microcracks occur.