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Open AccessArticle

Equipment and Technology for Combined Ion–Plasma Strengthening of Cutting Tools

High-Efficiency Machining Technologies Department, Moscow State University of Technology “STANKIN”, Vadkovsky per. 3A, Moscow 127055, Russia
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Machines 2018, 6(4), 58; https://doi.org/10.3390/machines6040058
Received: 17 October 2018 / Revised: 4 November 2018 / Accepted: 6 November 2018 / Published: 9 November 2018
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 μm to ~2 μm. At the second stage, the reamer surface was nitrided within 1 h at a temperature of 500 °C stabilized by regulation of the negative bias voltage accelerating the nitrogen ions. At the third stage, a 3 μm 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 μs wide pulses. After the combined strengthening, the cutting edge radius of the coated reamer amounted to ~5 μm 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-Text
Keywords: machine; cutting tools; sharpening; plasma; neutral beams; coatings; roughness machine; cutting tools; sharpening; plasma; neutral beams; coatings; roughness
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MDPI and ACS Style

Grigoriev, S.N.; Metel, A.S.; Melnik, Y.A.; Volosova, M.A. Equipment and Technology for Combined Ion–Plasma Strengthening of Cutting Tools. Machines 2018, 6, 58.

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