OBRABOTKAMETALLOV TECHNOLOGY Vol. 24 No. 2 2022 a b Fig. 2. The front of the rod at the exit of the die (a) and the cutting surface of the rods (b) a friction index equal to 0.7 [21] by Siebel’s law, which is due to the high level of normal stresses characteristic for extrusion [22, 23], in contrast to rolling, where Coulomb’s law is applied. The diameter of a container is 800 mm, the extrusion die diameter is 355.6 mm, and the elongation ratio in this process is 5.06. It is extrusion with a light reduction. In accordance with equations (1) and (2) other deformation indicators can be estimated: = 1.62, % The deformable medium properties are described by a model from the program interface: AL6061 Machining-Johnson, the strain range: 0-5; the strain rate range: 0-100,000 s-1; the temperature range: 20–550 оС. Additionally, these data are verifi ed with the properties given in the source [24]. Results and discussion Fig. 3, a shows the result of solving the problem in the form of equal strain areas in the extrusion stationary stage for the rod longitudinal section. Accordingly, Fig. 3, b shows a strain distribution graph along the radial coordinate r. The strain is distributed nonuniform: in the rod center, the strain is equal to 1.1, and on the periphery is 4.5; the difference is 100·(4.5–1.1)/1.1 = 309 %. a b Fig. 3. Distribution of the strain degree in the longitudinal section of the pressed rod in the stationary stage (a) and the graph of the distribution of this value along the radial coordinate (b)
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