| Abstrakt: |
We studied the effect of the cutting speed during fine turning of the hardened KhVG steel on the force components and the cutting temperature, roughness and waviness of the machined surface. Finishing turning was carried out with cutters with the mechanical fastening of square tetrahedral plates (inserts) made of cubic boron nitride, manufactured in high-pressure machines from cBN and aluminum powders. The plate materials differed in phase composition, structure fineness, and physical and mechanical characteristics. With an increase in cutting speed from 0.8 to 5.5 m/s, the temperature of the cutter tip in the cutting zone increases nonlinearly from 650 to 1100°C, and the average values of the components and the resultant cutting force, the standard deviations of the components and the resultant cutting force, the amplitude of harmonic oscillations of the cutting force, the parameters of roughness and waviness of the machined surface decrease. It is advisable to use tools with a cubonite grain size of 2/1, 3/2, 7/5 and a cBN and AlN phase composition for the finishing turning of hardened KhVG steel. Tools with the grain size of the initial cBN powder 7/5 and the phase composition of the composite 87 wt % cBN + 13 wt % AlN demonstrated the best results. [ABSTRACT FROM AUTHOR] |
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