Surveying the topography and examining the quality of the machined surface of selected hardened steels in the milling process
The article deals with the surface roughness examination of three selected hard materials K100, 100CrMnMo7 and 16MnCr5, all with a defined hardness of HRC 60. The individual materials were machined using sintered carbide and cermet cutting materials with TiCN and TiN + TiCN + Al2O3 coatings. The research resided in the realization of three experiments. These experiments were carried out by three alternatives differing in the setting of basic cutting parameters. The experimental procedure was realized by the simulation method and direct contact measurement method of surface roughness. From the overall technical evaluation described in the practical part of the article, for the primarily observed parameter – the surface roughness, the least suitable values were obtained in the evaluation of the material from experiment No. 1 - K100 with hardness HRC60. The experiments realized and the results achieved show that the machining of tool steels and other superhard materials requires special cutting tools, machines as well as the use of progressive technologies, to ensure the production of a shaped, dimensionally and qualitatively functional component.