THE ANALYSIS OF SPECIFIC CUTTING FORCES AT MACHINING OF COMPOSITE MATERIALS

This paper deals with the analysis of specific cutting forces acting on the carbide milling cutters deposited by AITiN, nACo and diamante coating. Glass-polyester and carbide-epoxy composite materials were chosen as the workpiece material. Glass and carbon fibers are now most common types of reinforcement in composite materials. Each tested milling cutter performed twenty-one passes through workpiece material to reduce the influence of irregular structure of tested composite materials, especially glass-polyester composite. The milling process was carried out without using process liquid, so it was dry machining. The development of specific cutting forces with the changing of cutting condition and increasing wear of the tested milling tools were monitored simultaneously. Dynamometer Kistler was used for measuring of force loading, obtained data was reconverted to specific cutting forces for comparison of milling cutters with different geometry of cutting edges. The evaluation of milling tools surfaces were performed on an electron microscope.