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Machines 2018, 6(4), 58; https://doi.org/10.3390/machines6040058

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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Received: 17 October 2018 / Revised: 4 November 2018 / Accepted: 6 November 2018 / Published: 9 November 2018
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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 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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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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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