Industrial use of the high-rate (impact) pressing of metallic powders

Features of the high-rate (impact) pressing of metal powders are discussed. It is shown that impact pressing compacts powders to a relative density wh ich is 97% of the theoretical value after a single loading. The pressure wh ich exists during high-rate pressing is usually higher than the static pres sure for the same density of the pressed powder. The force which presses th e products out of the die is 1.5-2.5 times lower than in static pressing. P reliminary pressing of the powder reduces friction losses and ensures a mor e uniform distribution of density over the height of the product. Recommend ations are given on the loading rate in high-rate pressing and on the use o f this operation in relation to the shape of the product. An example is giv en to illustrate the use of high-rate pressing for making large-diameter ga skets from copper powder.