Radial-longitudinal extrusion of parts with a flange and a ledge
DOI:
https://doi.org/10.37142/2076-2151/2023-1(52)95Keywords:
parts with flange and ledge, combined radial-longitudinal extrusion, movable die, stress-strain state, finite element method, workpiece forming.Abstract
Levchenko V., Alieva L., Abhari P., Sivak R. Radial-longitudinal extrusion of parts with a flange and a ledge.
Methods for manufacturing hollow and rod axisymmetric parts with a flange and an axial ledge by extrusion are considered. Depending on the design and parameters of the part, two groups of predominantly accepted methods of combined extrusion are distinguished: radial-backward and radial-forward extrusion. The results of modeling the process of combined radial-reverse extrusion of a rod part with a flange by the finite element method using the Q-Form software package are presented. It has been confirmed that with combined extrusion of a part with a flange and a ledge with metal outflow in the radial and forward directions in a fixed matrix, the plastic deformation zone is combined. In this case, the flange formed by radial extrusion can become a stagnant zone along which the metal will move in the forward direction. This causes the risk of breaking the part and separating the flange. The new method of combined extrusion in a movable matrix involves the separation of metal extrusion centers in the radial and direct directions from the beginning of the process. An assessment is made of the regularities of shape change and development of the deformed state of the workpiece in the process of combined extrusion in a movable matrix. It is found that the mobility of the die prevents the danger of separation of the flange. At the same time, the concentration of zones with the most intense deformation at the outlet holes on the transitional edges of the shaping tool is maintained. Comparison of the deformed state of the workpiece obtained by the finite element method with experimental data obtained by the dividing grid method showed a close nature of the deformation fields in the plastic zone.
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