Abstract
Features of the high-rate (impact) pressing of metal powders are discussed. It is shown that impact pressing compacts powders to a relative density which is 97% of the theoretical value after a single loading. The pressure which exists during high-rate pressing is usually higher than the static pressure for the same density of the pressed powder. The force which presses the products out of the die is 1.5-2.5 times lower than in static pressing. Preliminary pressing of the powder reduces friction losses and ensures a more uniform distribution of density over the height of the product. Recommendations are given on the loading rate in high-rate pressing and on the use of this operation in relation to the shape of the product. An example is given to illustrate the use of high-rate pressing for making large-diameter gaskets from copper powder.
Similar content being viewed by others
REFERENCES
O. V. Roman and E. A. Doroshkevich, “Sintering of cermet products pressed by impact loads,” Poroshk. Metall., No. 5, 6-9 (1966).
O. V. Roman and E. A. Doroshkevich, “Pressing of iron powders by impact loads,” in: Powder Metallurgy [in Russian], LatINTI, Riga (1968), pp. 68-72.
R. Davis, “Use of high rates to press metal powders and forge powder semifinished products,” Powder Metallurgy [in Russian], Vysheish. Shk., Minsk (1987), Vol. 1, pp. 26-29.
I. D. Rodomysel'skii and G. G. Serdyuk, “Study of the high-rate pressing of metal powders,” in: First National Conference on Powder Metallurgy (transactions), Scientific-Technical Society of Mechanical Engineering, Sofia (1968), pp. 3-12.
G. G. Serdyuk, V. F. Reshetnikov, L. I. Svistun, and O. V. Mikhailov, “Impact pressing of brass powders,” Poroshk. Metall., No. 12, 25-29 (1985).
G. G. Serdyuk, L. I. Svistun, V. F. Reshetnikov, et al., “Experimental unit for the two-sided impact pressing of metal powders in closed dies,” Poroshk. Metall., No. 7, 95-99 (1981).
V. F. Reshetnikov, L. I. Svistun, G. G. Serdyuk, et al., “Heat generation during the impact pressing of iron powder,” Poroshk. Metall., No. 1, 5-7 (1983).
V. F. Reshetnikov, L. I. Svistun, and G. G. Serdyuk, “Stresses in the die during the impact pressing of metal powders,” Poroshk. Metall., No. 6, 22-26 (1985).
M. S. Koval'chenko, “Dynamics of the hot impact pressing of powdered materials,” Poroshk. Metall., No. 9, 24-31 (1992).
V. N. Kobrin, A. N. Meshcheryakov, V. D. Grechka, et al., “High-rate forming of a clad graphite semifinished product,” Poroshk. Metall., No. 3, 21-25 (1982).
A. T. Mamedov, “Development of a technology for pressing high-density products with the use of a method of gas drainage. I. Mathematical analysis of gas drainage from the mold and the intrapore pressure of the gases in the compacts,” Poroshk. Metall., Nos. 5-6, 34-39 (1994).
G. A. Meerson, B. A. Borok, and B. N. Lobashev, “Study of the hydrostatic pressing of metal powders,” in: Transactions of the VII All-Union Scientific-Technical Conferenc on Powder Metallurgy [in Russian], Erevan (1964), pp. 106-121.
Sano Yukio and Miyagi Kiyohiro, “Dynamic compaction and the effect of air contained within powder pores,” Int. J. Powder Metall. Powder Technol., 20, No. 2, 115-118, 120-124, 126-129 (1984).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Serdyuk, G.G. Industrial Use of the High-Rate (Impact) Pressing of Metallic Powders. Powder Metallurgy and Metal Ceramics 39, 514–520 (2000). https://doi.org/10.1023/A:1011330909698
Issue Date:
DOI: https://doi.org/10.1023/A:1011330909698