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The influence of the cooling method on high performance cutting of the AlZn5.5MgCu alloy

Aluminum parts with complex shapes are usually produced in small series. For complex aluminum structures, thin-walledness and a large number of closed areas of relatively high depth are characteristic. The implementation of a single aerial support structure sometimes requires removing more than 90% of the material from the semifinished product. For economic reasons, it is necessary to abandon production methods that are difficult to automate, such as work and time-consuming riveting of the wing construction elements or the fuselage of the aircraft. The production efficiency is increased by increasing the machining parameters, such as axial infeed ap, radial ae, cutting speed vc and feed per tooth fz [1, 4-6, 8]. For these reasons, new machining methods have emerged, such as machining with high cutting speeds HSC (high speed cutting) and high-performance machining HPC (high performance cutting). HSC machining is mainly used at the finishing stage, and its advantages include increased productivity, reduced energy impact of the tool on the workpiece and improved quality of the work surface. In contrast to the HSC treatment, the HPC method is mainly used in the roughing stage. It ensures a significant reduction of production time and costs. However, both methods also have some practical limitations [1, 4, 6, 8]. They mainly result from high values of machining parameters such as ap, ae and fz, and large crosssections of the cutting layer, which in turn affect the increase of the values of the cutting force components. An equally big problem is the need to quickly evacuate a significant amount of chips, which results from the difficult access of cooling-