THE APPLYING OF HIGH-PERFORMANCE MACHINING METHOD FOR CUTTING OF STRUCTURAL STEELS

The implementation of high-speed machining (HSM) allows minimizing the processing time, raising the specific volume cutting efficiency, and achieving the range of advantages having a positive effect on the economic efficiency of this method. However, to implement this technology in practice, it is necessary to follow the set of measures and requirements to the manufacturing system. In particular, the wide use of HSM negates the necessity of having the expensive equipment – specialized CNC machines (computerized numerical control machines).

The research of HSM in practice resulted in the modifications of this type of processing – high-performance machining (HPM). The distinctive features of HPM are the reduced (as compared with HSM) spindle rotational speed (cutting speed) and the increased volumes of removed material (the depth and width of cutting). The goal of the research is the study of feasibility to apply HPM for cutting of structural steel using undedicated CNC machines widely used for traditional milling. When preparing and carrying out the research, the author took into account the mechanical properties of process material; MDTP (machine-device-tool-part) system stiffness; machine technical data; material, coating, and geometry of a cutting tool. The temperature in the cutting area and the work material and cutting tool temperature were recorded as well. The study determined the following mandatory parameters of the process: smooth, tangentially costate trajectories of a tool; angle of cutter spiral; cutter engagement angle. The calculation of cutting time and cutting specific volume showed the advantage of HPM as compared to the traditional CNC milling. The process parameters having a positive impact on tool wear are determined and the parameters constraining the process of HPM implementation are considered.