# Research on Roughness and Microhardness of C45 Material Using High-Speed Machining
## 1 Introduction
The correct setting of cutting parameters and conditions is not only a test for titanium alloys but also for aluminum [11; 12] and nickel alloys [13; 14], which are an integral part of the automotive and aerospace industries. Various methods can be implemented to set the optimal parameters, as described in article [15] for the AI/075 aluminum alloy machining process. The influence of cutting conditions on the topography of this alloy is also recorded by the authors [16], which describes the progressive machining of AI/075 using the MQL system. The mentioned research showed that the most significant influence on the topography of the AI/075 surface with the implementation of MQL (minimum quantity lubrication) has cutting feed and the least-cutting speed. The assessment of the machining process using MQL technologies was also described by the authors [17] with the derivation of a sustainable machining model. The machining parameters were also examined by the authors [18] in novel dry ice blasting cooling assisted milling in comparison with minimum quantity lubrication (MQL). The material AISI-52100 tool steel was also tested with the application of the new hybrid technology (MQL + CO\({}_{2}\)) [19] in order to improve the machinability and sustainability of the production process. During the experiments, cutting forces, tool wear, residual stresses, surface roughness, surface hardness, and cutting temperature were investigated when changing cutting speed and feed per tooth using novel hybrid technology. The results of the experiment pointed to the improvement of the tool steel milling process (chip removal, cutting heat removal, and excellent lubrication), as the precise penetration of MQL lubrication and dry ice grains into the cutting site was achieved. In order to assess the influence of cutting conditions on topography, it is possible to implement a simulation method [20; 21; 22; 23] as well as the Taguchi method [24; 25; 26], et cetera, in the development phase. Based on the above overview, the need to investigate cutting conditions in the process of conventional and progressive machining methods can be determined [27; 28; 29; 30], while the focus of research is extended to a wide range of materials. The present research deals with the study of the C45 material, which is characterized by its broad-spectrum applicability in various industries and its economic efficiency. For this reason, it is necessary to gain knowledge about the behavior of C45 material not only during machining by conventional methods, as reported by the authors' studies [31; 32; 33; 34], but also the behavior of the material in progressive machining processes. However, the research of progressive machining of C45 material is focused on areas such as [35; 36; 37; 38], while from a practical point of view and applicability in production processes in practice, the HSM is applied for other materials such [39; 40; 41] as it is necessary to focus on standard HSM (high-speed machining) processes [42], which are implemented in this research with subsequent analysis of the influence of cutting parameters on the formation of deformations in the cutting zone. The contribution of this article lies in  
* Processing of predictions for the possibility of determining the quality of the surface of the machined components
* Identification of changes in surface roughness depending on the cutting speed
* Identification of the wear of the cutting edges due to the change in the cutting speed