CHIP MORPHOLOGY AND WEAR PROCESS OF THE OPERATING FLOOR OF A CARBIDE END MILL IN THE TREATMENT OPERATION OF INCONEL 625 ALLOY

The paper presents the results obtained in experimental studies of chip morphology and wear process that occur during milling of inconel 625 alloy obtained through additive technology Electron Beam Aadditive Manufacturing (EBAM). The sample was obtained from a wire in a pilot installation using proven technological modes. The microstructure and physical and mechanical characteristics of the inconel 625 sample were studied using certified analytical equipment. Carbide end mills were used as a cutting tool, machining was carried out with no coolant according to the counter milling operation across the synthesis direction in additive manufacturing. During the experiments, chipping was selected, which was examined after that using a scanning electron microscope (SEM) and X-ray diffraction analysis (XRD) equipment. Observation and analysis of chipping at various magnifications showed a change in its shape and an increase in the degree of yield strain depending on the intensification of cutting modes. A detailed study with the help of SEM for the cutting side of the facing showed that with increasing cutting modes, increased grain transfer of WC tool material to the facing surface is observed. This is an indicator of accelerated wear and premature failure of the cutting edges due to softening of the cobalt binding agent. Also, when studying cutting edges of the milling cutter using the XRD method, complex Cr23C6 carbide and NiW intermetallic compound were found. They contribute to increased wear on the milling cutter operating floors. The study of the wear characteristics of the operating floors of cutting tools and facing formed within machining operation allows making recommendations for improving wear resistance and determining rational operating modes.