Influence of cold combined extrusion process parameters on the deformability of blankets
DOI:
https://doi.org/10.37142/2076-2151/2025-1(54)5Keywords:
combined extrusion, stresses, deformations, plasticity, deformability, used plasticity resource.Abstract
Aliiev I., Sivak R., Abhari P. Influence of cold combined extrusion process parameters on the deformability of blankets
The practical implementation of the requirements for modern machine-building production in conditions of high competition is the use of resource-saving processes. One of such processes is innovative methods of cold volumetric stamping, which contribute to the production of high-quality products with minimal costs. In particular, methods of com-bined extrusion with stepwise deformation allow obtaining parts of complex configuration with improved mechanical properties of the deformed metal, high accuracy, the necessary technological heritability and increased values of limiting dimensions. At the same time, such processes allow significantly reducing the deformation force and, as a result, increas-ing the stability of the tool. At the same time, expensive steel grades can be replaced with cheaper ones without deterio-rating the service properties of products due to the formation of a macrostructure favorable for the operation of products, the necessary level of deformation hardening and damage to the deformed metal. But the gradual deformation is the cause of the metal flow, which is characterized by non-monotonic plastic deformation, and this significantly complicates the theoretical solution of this type of metal processing problems from the point of view of calculating the components of the stress tensor and damage. As a result, there is a need to independently obtain information about the kinematics of the plastic flow of the metal, the corresponding mechanical properties and the structure of the material functions, which are necessary for calculating the stress-strain state and the value of the used plasticity resource during non-monotonic de-formation under conditions of a volumetric stressed state. Based on theoretical and experimental studies, the article proposes to use cold combined extrusion methods for the manufacture of parts. This will significantly increase the limiting dimensions and improve the indicators of the technological heredity of the product. To assess the plasticity of the metal, the article proposes a set of calculations that takes into account the peculiarities of the process of volumetric stamping of parts, in which the metal is under conditions of non-monotonic plastic deformation.
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