MODELLING OF HIGH ENERGY IMPACTED BALL MILLING AND BALL MOTION BY FINITE ELEMENT ANALYSIS

Year 2017, Volume: 30 Issue: 2, 187 - 194, 19.06.2017

Ali Rıza Aktaş Gülsün Aktaş , Metin Gürü

Abstract

SPEX^® 8000 Mixer/Mill is a high-energy ball mill which is used mostly for laboratory scale processes. This study deals with an investigation on reactor and ball velocities of SPEX^® 8000 Mixer/Mill by finite element method for different shaft frequencies. Ball collisions in milling devices are governed by complex dynamics ruled by unpredictable impulsive forces. The analysis of reactor motion and ball in the reactor are carried out by using transient structural and rigid dynamics analysis systems of ANSYS^TM software. Velocity/acceleration values of reactor and velocity of ball at 115 rad s^-1 obtained from the analysis are compared with mathematical models in the literature. The results obtained from analyzes are in accordance with the mathematical model has proved the correctness of the analysis model. Kinematic variables for empty reactor and ball are obtained for different shaft frequencies by using the same analysis model. Thus, the purpose of this study is to calculate the working frequency of SPEX^® 8000 Mixer Mill for different type of materials.

Keywords

High energy impact, Finite element analysis, SPEX® 8000, Reactor/ball velocity, ANSYSTM.

References

• Aikin, B.J.M. and Courtney, T.H., “The kinetics of composite particle formation during mechanical alloying”, Metall. Trans. A., 24(3):647–57, (1993).
• Aikin, B.J.M. and Courtney, T.H., “Modelling of particle size evolution during mechanical milling”, Metall. Trans. A, 24(11): 2465–71, (1993).
• Arslan, D. and Gürü, M., “Mekanokimyasal yöntemle borkürbür sentezi ve alüminyum matrisli kompozit malzemede kullanılabilirliğin incelenmesi”, J. Fac. Eng. and Archit. Gazi Uni., 28(4):875-883, (2013).
• Benjamin, J.S., Mechanical alloying – a perspective, Met. Powder Rep., 45: 122–7, (1990).
• Caravati, C., Delogu, F., Cocco, G. and Rustici, M., “Hyperchaotic Qualities of the Ball Motion in a Ball Milling Device”, Am. Inst. Phys., 9(1): 219-227, (1999).
• Concas, A., Lai, N., Pisu, M. and Cao, G., “Modelling of Comminution Processes in Spex Mixer/Mill”, Chem. Eng. Sci., 61: 3746 – 3760, (2006).
• Çakanyıldırım, Ç. and Gürü, M., “Processing of LiBH4 from its elements by ball milling method”, Renew. Energy, 33(11): 2388-2392, (2008).
• Fecht, H.J., Hellstern, E., Fu, Z. and Johnson, W.L., “Nanocrystalline metals prepared by high-energy ball milling”, Metall. Mater. Trans. A, 21(9): 2333-2337, (1990).
• Harris, J.R., Wattis, J.A.D. and Wood, J.V., “A comparison of different models for mechanical alloying”, Acta Mater., 49(19): 3991–4003, (2001).
• Hwang, S., Nishimura, C. and McCormick P.G., “Mechanical milling of magnesium powder”, Mater. Sci. Eng.:A, 318(1-2): 22-33, (2001).
• Poschel, T., Salueña, C. and Schwager, T., “Scaling properties of granular materials”, Phys. Rev. E, 64: 1-4, (2001).
• Razavi, M., Irankhah, R. and Rahimipour, M.R., “Effect of milling of C and Ti as ceramic coating on the properties of 7Ch3 tool steel during plasmaspray process”, J.Materials: Design and Applications, 229(2): 137-145, (2015).
• Schoenitz, M., Ward, T. and Dreizin, E.L., “Preparation of energetic metastable nano-composite materials by arrested reactive milling”, Mater. Res. Soc. Symp.-Proc., 800: 85–90, (2003).
• Sözen, A., Özbaş, E., Menlik, T., Çakır, M., Gürü, M. and Boran, K., “Improving the Thermal Performance of Diffusion Absorption Refrigeration System with Alumina Nanofluids: An Experimental Study”, Int. J. Refrig., 44: 73-80, (2014).
• Spex Sample Prep, “8000M Mixer/Mill Operating Manual”, USA, (2003).
• Suryanarayana, C., “Mechanichal Alloying and Milling”, Prog. Mater. Sci., 46:1-184, (2001).
• Ward, T.S., Chen, W., Schoenitz, M., Dave, R.N. and Dreizin, E.L., “A study of mechanical alloying processes using reactive milling and discrete element modeling”, Acta Mater., 53: 2909–2918, (2005).
• Zhang, D.L., “Processing of advanced materials using high-energy mechanical milling”, Prog. Mater. Sci., 49(3–4): 537–600, (2004).