MASS PRODUCTION OF HFCVD DIAMOND-COATED WIRE-DRAWING DIES WITHOUT FILAMENT THROUGH THE HOLE

Xin Song, Cheng-Chuan Wang, Xin-Chang Wang and Fang-Hong Sun
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Xin Song: School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 20024, P. R. China
Cheng-Chuan Wang: School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 20024, P. R. China
Xin-Chang Wang: School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 20024, P. R. China
Fang-Hong Sun: School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 20024, P. R. China

Surface Review and Letters (SRL), 2021, vol. 28, issue 03, 1-14

Abstract: Hot filament chemical vapor deposition (HFCVD) diamond-coated small aperture wire-drawing dies from Φ0.8 to Φ2mm are in high demand. A new deposition technique without filaments through the inner hole of wire-drawing dies is proposed, accompanied with the specially designed fixtures. Temperature distribution on the deposition surfaces is studied by computational fluid dynamics (CFD) simulation based on the finite volume method (FVM); both case study and mass production simulations are accomplished. Excellent performance and uniform multilayer MCD/NCD/MCD/NCD films are successfully deposited on the inner-hole surfaces of total 16 cemented carbide (WC-6wt.%Co) wire-drawing dies with an aperture of Φ2.0mm in one batch. Drawing results of gas shield welding wires show that the lifespan of the multilayer diamond coated wire-drawing dies is about 20 times of the uncoated cemented carbide dies and 2 times of the monolayer MCD coated dies.

Keywords: HFCVD; wire-drawing die; without filaments through inner hole; multilayer diamond films (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1142/S0218625X21500062

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