OBRABOTKAMETALLOV technology Vol. 25 No. 2 2023 a b Fig. 2. Titanium sponge (a); particle morphology (b) occurrence and growth of the pressing force P1, which reaches a certain maximum value * 1 P corresponding to the general flow of the deformed material in the mold channel. The action of contact friction in the mold leads to a decrease in pressure in the compressible particles as they move along the flow lines. In this case, the greatest pressure is experienced by particles located in the immediate vicinity of the working plunger; porosity reduction is possible according to the applied forces. In the second stage of the process, the pressed material flows out of the mold channel. In the section A-B, separating parts 6 and 5 of the mold, there is a force 2 n P that creates a counter-pressure to the flow of the plastic compressible medium (fig. 3, a). a b Fig. 3. A statically permissible scheme of loading on a layer of severe deformation (a) and a kinematically permissible flow scheme of a plastically compressible medium in a layer A–B (b) The force PAB is determined by the equilibrium conditions of the forces acting on the compressible material in the mold channel: = + πτ 2 2 2 , AB c P P DL (1) where P2 is the force that creates counter-pressure; Τc2 is a sliding friction stress on the mold surface; L2 is the discard length; D is the channel diameter.
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