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.

中文翻译：

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无长丝通孔的 HFCVD 金刚石涂层拉丝模具的批量生产

热丝化学气相沉积 (HFCVD) 金刚石涂层小孔径拉丝模具来自Φ0.8到Φ2mm 的需求量很大。提出了一种新的无细丝通过拉丝模具内孔沉积技术，并配备了专门设计的夹具。通过基于有限体积法（FVM）的计算流体动力学（CFD）模拟研究沉积表面的温度分布；案例研究和批量生产模拟均已完成。共 16 个孔径为Φ2.0mm 一批。气保焊丝的拉丝结果表明，多层金刚石涂层拉丝模具的寿命约为未涂层硬质合金模具的20倍，是单层MCD涂层模具的2倍。