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Korean Journal of Metals and Materials > Epub ahead of print
Jong Won Baek and Seong Jin Park
Pressure Transmission in the Compaction Process of Nickel Powder using the Finite Element Methods
Received: 17 December 2018;  Accepted: 24 December 2018.  Published online: 9 January 2019.
ABSTRACT
The compression process is one of the more widely used industrial manufacturing methods for fabricating shapes with various materials such as metals and ceramics. In the compaction process, the upper punch moves into the powder, and force is transmitted between particles, achieving densification. In this process, the powder can be considered to be in a particulate state, which means that while the powder consists of solids, it has characteristics quite similar to the fluid. Therefore, particles in the process can be seen as responding to hydrostatic pressure, and it can be assumed that the pressure is constant. However, the forces acted on the inter-particle continue to change during the process. Many parameters affect the force change, including compaction speed and the contact angle between particles. However, it is very difficult to verify these effects through experiments because it is impossible to arrange the inter-particle angle. Therefore, in this study, the force transmission mechanism was simulated in the compaction process using FEM simulation. To examine the contact angle and force transmission between the particles, a green compact was modeled as individual particles rather than as a continuum green compact. Finally, it was confirmed through analysis that the pressure transmission between the particles remained constant during the compression process.
Keywords: compaction, FEM simulation, spherical powder, pressure transmission
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