Power modes and stress-strain state during cold extrusion of a rectangular cavity in a square billet
DOI:
https://doi.org/10.37142/2076-2151/2019-2(49)91Keywords:
cold back extrusion; square billet; rectangular cavity; finite element method; forces and specific forces; stresses; strains; metal temperature.Abstract
Kalyuzhny V. L., Levchenko V. M., Marchuk K. L., Dementеev M. V. Power modes and stress-strain state during cold extrusion of a rectangular cavity in a square billet // Material working by pressure. – 2019. – № 2 (49). - Р. 91-97.
A finite element method is used to create a mathematical model and analyze the cold back extrusion of a rectangular cavity in a square billet of ductile aluminum Al-2024. An elastic-plastic model of metal is used. Hardening, Coulomb friction, deformation rate and thermal effect during cold forming are taken into account. Modeling of the processes of extrusion, extraction of the punch from a deformed billet and pushing the product out of the matrix is given. The dependences of the forces of extrusion, extraction of the punch and pushing the product from the movement of the deforming tool are established. The distributions of specific forces on the contacting surfaces of the workpiece with a punch, die and ejector are determined. The temperature of the metal during extrusion was revealed. The distributions of stress components in a deformed workpiece are given at maximum strain and distribution of the components of the deformed state in the product after extrusion. Taking into account elastic deformation, the final shape and dimensions of the product are determined and the mechanical properties in the walls are predicted.
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