INFLUENCE OF CUTTING CONDITIONS AND TOOL COATINGS ON THE SURFACE FINISH OF WORKPIECES OF MAGNESIUM OBTAINED BY DRY TURNING

The main reason for carrying out this work is that in industries, such as the aeronautical and motor, it is usually necessary to make repair operations on pieces of light alloys with inserts of other types of metals such as steel or stainless steel and that have stringent requirements of surface finish. In this work, the goal is to find the relationship between the different combinations of cutting parameters and tool coatings, and the quality of the surface finish of the workpieces made up of magnesium UNS M11311. The followed methodology consists of a series of tests of dry horizontally turning carried out with tools of different coatings and under cutting conditions usually used in repair operations. The principal result is that the best surface finishes are obtained for low feeds. Once the lower feed value is fixed the minimum roughness value is obtained for certain combinations of cutting speed and coating. As a first conclusion, it is possible to affirm that for repairing operations the machine tool is not a critical issue.