EXPERIMENTAL INVESTIGATION ON STRESS AND DIE-WALL FRICTIONAL CHARACTERISTICS OF METAL POWDER DURING HIGH-VELOCITY COMPACTION

Wei Zhang; Kun Liu; Jian Zhou; Rongxin Chen; Ning Zhang; Guofu Lian

doi:10.17222/mit.2019.300

Wei Zhang School of Mechanical & Automotive Engineering, Fujian University of Technology, Fuzhou 350118, China
Kun Liu Institute of Tribology, Hefei University of Technology, Hefei 230009, China
Jian Zhou Institute of Tribology, Hefei University of Technology, Hefei 230009, China
Rongxin Chen Institute of Tribology, Hefei University of Technology, Hefei 230009, China
Ning Zhang School of Mechanical & Automotive Engineering, Fujian University of Technology, Fuzhou 350118, China
Guofu Lian School of Mechanical & Automotive Engineering, Fujian University of Technology, Fuzhou 350118, China

DOI: https://doi.org/10.17222/mit.2019.300

Keywords: metal powder, high-velocity compaction, friction coefficient , stress

Abstract

In this study, to evaluate the change in the stress and die-wall frictional characteristics during high-velocity compaction (HVC), a metal powder was subjected to HVC with a heavy hammer based on the stress-testing technology and Janssen-Walker model. The changes in the green density, stress characteristics and coefficients of friction at different impact heights were investigated. The density of green compacts increased with the increase in the impact height. The stress in the upper and lower punches and the die wall showed repeated loading and unloading. The coefficient of friction of the die wall underwent three stages and was related to powder densification. As the height position along the side wall was increased, the coefficient of friction increased gradually. With an increased impact height, the coefficient of friction increased significantly in the incomplete-molding stage but remained constant in the complete-molding stage. This work expands the theoretical basis of densification processing of a metal powder during HVC.

References

1 J. Z. Wang, X. H. Qu, H. Q. Yin, M. J. Yi, X. J. Yuan, High velocity compaction of ferrous powder, Powder. Technol., 192 (2009) 1, 131–136, doi:10.1016/j.powtec.2008.12.007
2 H. Li, H. Q. Yin, D. F. Khan, H. Q. Cao, Z. Abideen, X. H. Qu, High velocity compaction of 0.9Al2O3/Cu composite powder, Mater. Design., 57 (2014), 546–550, doi:10.1016/j.matdes.2013.12.059
3 B. Azhdar, B. Stenberg, L. Kari, Development of a high-velocity compaction process for polymer powders, Polym. Test., 24 (2005) 7, 909–919, doi:10.1016/j.polymertesting.2005.06.008
4 F. Güner, Ö. N. Cora, H. Sofuoğlu, Effects of friction models on the compaction behavior of copper powder, Tribol. Int., 122 (2018), 125–132, doi:10.1016/j.triboint.2018.02.022
5 S. Turenne, C. Godère, Y. Thomas, P.-É. Mongeon, Evaluation of friction conditions in powder compaction for admixed and die wall lubrication, Powder Metall., 42 (1999) 3, 263–268, doi:10.1179/ 003258999665611
6 H. Staf, E. Olsson, P. Lindskog, P. L. Larsson, Determination of the frictional behavior at compaction of powder materials consisting of spray-dried granules, J. Mater. Eng. Perform., 27 (2018) 3, 1308–1317, doi:10.1007/s11665-018-3205-1
7 B. J. Briscoe, S. L. Rough, The effects of wall friction in powder compaction, Colloid. Surfaces A, 137 (1998) 1, 103–116, doi:10.1016/S0927-7757(97)00210-0
8 E. Doelker, D. Massuelle, Benefits of die-wall instrumentation for research and development in tableting, Eur. J. Pharm. Biopharm., 58 (2004) 2, 427–444, doi:10.1016/j.ejpb.2004.03.011
9 R. M. Nedderman, Statics and kinematics of granular materials, Cambridge University Press, Cambridge 1992
10 C.-Y. Wu, O. M. Ruddy, A. C. Bentham, B. C. Hancock, S. M. Best, J. A. Elliott, Modelling the mechanical behavior of pharmaceutical powders during compaction, Powder Technol., 152 (2005) 1, 107–117, doi:10.1016/j.powtec.2005.01.010
11 J. Z. Wang, H. Q. Yin, X. H. Qu, J. L. Johnson, Effect of multiple impacts on high velocity pressed iron powder, Powder Technol., 195 (2009) 3, 184–189, doi:10.1016/j.powtec.2009.05.028
12 H. Z. Zhang, L. Zhang, G. Q. Dong, Z. W. Liu, M. L. Qin, X. H. Qu, Y. Z. Lü, Effects of annealing on high velocity compaction behavior and mechanical properties of iron-base PM alloy, Powder Technol., 288 (2016), 435–440, doi:10.1016/j.powtec.2015.10.040
13 F. P. Bowden, D. Tabor, The Friction and Lubrication of Solids, Oxford University Press, Oxford 1954
14 J. P. Gao, W. D. Luedtke, D. Gourdon, M. Ruths, J. N. Israelachvili, U. Landman, Frictional forces and Amontons’ law: from the molecular to the macroscopic scale, J. Phys. Chem. B., 108 (2004) 11, 3410–3425, doi:10.1021/jp036362l