Mechanical vibration-assisted metal powder filling process and mechanism based on the discrete element method--颗粒学报PARTICUOLOGY

Liu, R., Qiu, J., Zhang, Q., Wu, Z., Li, X., Che, L., & Ju, D. (2024). Mechanical vibration-assisted metal powder filling process and mechanism based on the discrete element method. Particuology, 94, 84-95. https://doi.org/10.1016/j.partic.2024.07.021

Mechanical vibration-assisted metal powder filling process and mechanism based on the discrete element method

Ruihan Liu^a, Jiayong Qiu^a, Qiliang Zhang^a, Zhanfang Wu^b, Xiangyang Li^b, Lida Che ^b, Dianchun Ju^a *

a School of Metallurgy Engineering, Jiangsu University of Science and Technology, Zhangjiagang, 215600, China
b CISRI Hipex Technology Co., Ltd., Beijing, 100081, China

10.1016/j.partic.2024.07.021

Volume 94, November 2024, Pages 84-95

Received 18 June 2024, Revised 25 July 2024, Accepted 26 July 2024, Available online 6 August 2024, Version of Record 12 August 2024.

E-mail: judianchun@just.edu.cn

Highlights

• Determine the optimal process parameters from the perspective of particle mechanics.

• In vibration, particles come into contact in the form of high-frequency collisions.

• Explored the mechanism of vibration densification from macro and micro perspectives.

• Splitting a single harmonic vibration to characterize the velocity field.

• Use coordination number to reflect the filling state of metal powder in capsules.

Abstract

In this study, the discrete element method was combined with physical experiments to examine the capsule filling practice in the hot-isostatic-pressing process and to study the densification of spherical particles in a three-way pipe capsule for offshore engineering under mechanical vibration conditions. The effects of vibration parameters—such as the vibration time, vibration frequency, vibration amplitude, rolling friction coefficient, sliding friction coefficient, recovery coefficient, and other particle properties—on the filling density were analyzed. The results showed that the packing density in the three-way capsule could be increased considerably using a vibration frequency of 40 Hz and a vibration amplitude of 2.5 mm. The contact form between particles in the vibration-assisted mold-filling process was determined and the particle velocity field, compression force, and coordination number under a single harmonic vibration period were analyzed. The real-time motion of the particles at the micro level was visualized, and the mechanism of the mechanical vibration effect on mold filling and densification was explored. The distribution and evolution of the coordination number indicated that the distribution of the filling density was uneven, and that the change in the coordination number of particles at the bottom exhibited no major response to the vibration.

Graphical abstract

Keywords

Hot isostatic pressing; Capsule filling; Densification; Mechanical vibration; Discrete element method (DEM)

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