%0 Journal Article
%T Equipment and Technology for Combined Ion¨CPlasma Strengthening of Cutting Tools
%A Alexander S. Metel
%A Marina A. Volosova
%A Sergey N. Grigoriev
%A Yury A. Melnik
%J -
%D 2018
%R https://doi.org/10.3390/machines6040058
%X Abstract A combined strengthening of cutting tools for finishing has been carried out in glow discharge plasma filling a process vacuum chamber. At the first stage, reamers rotating around the axis distanced from the magnetron targets at 8 cm were bombarded by fast argon atoms produced due to charge exchange collisions of ions accelerated in space charge sheathes between the plasma and a negatively biased to 3 kV grid with a 25 cm radius of its concave surface curvature. The reamer bombardment by fast neutral atoms led to a reduction of its cutting-edge radius from ~7 ¦Ìm to ~2 ¦Ìm. At the second stage, the reamer surface was nitrided within 1 h at a temperature of 500 ¡ãC stabilized by regulation of the negative bias voltage accelerating the nitrogen ions. At the third stage, a 3 ¦Ìm thick TiN coating has been synthesized on the reamer bombarded by pulsed beams of 3 keV neutral atoms at a 50 Hz repetition rate of 50 ¦Ìs wide pulses. After the combined strengthening, the cutting edge radius of the coated reamer amounted to ~5 ¦Ìm and the roughness of the area machined by the reamer holes in blanks made of structural steel reduced by about 1.5 times. View Full-Tex
%K machine
%K cutting tools
%K sharpening
%K plasma
%K neutral beams
%K coatings
%K roughness
%U https://www.mdpi.com/2075-1702/6/4/58