CURRENT TRENDS AND PROSPECTS IN METAL FORMING DEVELOPMENT

Metal forming simulation data are presented. Among the tasks being viewed are the following: isothermal yield of a ring blank, drop die forging of body parts made of VT6 alloy, sheet metal piercing with a rotating plug, three-roll screw rolling with feed angles of 12 and 20 degrees, hot thick-gauge stretching of a spheroidal lid. It is shown that the use of the finite element method in solving metal forming problems makes it possible to take into account a greater number of factors affecting metal treatment, that is, to obtain a more accurate solution, which can be used for specific blanks and fitting-outs. Solutions to new process tasks, which did not have any experimental or theoretical data of particular value before, are given. Much attention is paid to the possibility of applying the Kirchhoff-Lyav hypothesis to sheet- metal forming operations. The main focus of the article is on hot thick-sheet stretching of spherical parts. The problem of hot stretch of a spheroidal container lid made of steel 10, 8 mm thick has been solved. The heating temperature of the material blank is 1000 °. The simulation was carried out in 2D and 3D, and metal treatment with tetrahedral and hexahedral grids were also viewed. It is concluded that the maximum accuracy of calculations is obtained for 3D modeling with a tetrahedral grid. The deviation of the forging shape from the detailed drawing is optimized. It is shown that maximum accuracy requires stamping with the minimum allowable temperature in the flange area of the blank.