MACHINING OF HARD-TO-WORK ALLOYS WITH CUTTING TOOLS WITH NANOSTRUCTURES

Abstract

Based on the study of grain size and coating composition before and after processing, studies of wear and durability of cutting tools (RI) with and without coating were carried out. The dependencies of the removed material volume for the period of resistance from plate wear on the back surface are obtained, which are higher for plates that were processed at a voltage on the substrate 250 V higher by 2.5 times (1.54) than at 200 V - 1.46 times ( 1.21). These values are smaller for semi-finishing and roughing (not processed plates), which is related to the grain size, which in the first case is 93.9 nm, i.e. when nanostructures are realized, whereas for the second, the grain size is higher, due to the longer application of the coating (30 minutes instead of 25 minutes in the first case), the temperature rise provides grain growth. When turning steel 45, the machining efficiency is higher than that of alloy HN77TUR, i.e. more effective shaping is provided - 3·106 mm3 in the first case and 2.7·10⁵ mm³ in the second case. It has been shown that it is possible to ensure the efficient shaping of the titanium alloy VT 22 with the help of an RI from a modified VK10 alloy (modified with chromium and aluminum nitrides;