Dimensionless invariants for assessing the stress–strain state in specific stamping operations are analyzed. Their influence on the stability of plastic deformation is discussed.

Mechanics of nonmonotonic plastic deformation

The stress state of metal in the plastic region is considered. The type of stress state is characterized. The remaining plasticity of a deformable metal in axisymmetric extension is estimated on the basis of a phenomenological measure of the deformability.

Stress state and deformability of metal in axisymmetric extension

The present article shows the phases of the development of a mathematical model of adhesive wear in die-forging stamps, which describes the wear mechanism and physical processes that accompany this type of wear. Emphasis is placed on a probabilistic assessment of the appearance of adhesive metallic forces accompanied by microdefects in the structure. Using the developed model, calculations have been carried out and the maximum permissible change in the sizes of the stamping tool has been calculated, which characterizes adhesive wear. This change is compared with the factory data on the durability of working pieces of stamps of multiposition forging that yield adequate compatibility.

Mathematical model of adhesive wear of three-dimensional dies

The development of new shaping technologies for pipe blanks requires simulation of the stress and strain fields, which permits assessment of the limiting stress and strain values. The stress–strain state of a pipe blank in expansion (including nonuniform expansion) is analyzed in the present work. Joint solution of the equilibrium equations and plasticity condition is employed here; that is the traditional approach. Analytical dependences of the stress in the wall of the pipe blank on the technological parameters are obtained; the basic formulas for estimating the strain are also presented. Experiments confirm the results.

Expansion of pipe blanks

The angular pressing of AD1 aluminum alloy blanks is analyzed by computer simulation and physical modeling. The structural changes and mechanical properties of the alloy are confirmed by microstructural and durability studies.

Angular pressing of aluminum alloy

Manufacturing processes for complex components with longitudinal fins and a collar are described.

Resource- and energy-saving manufacturing technologies based on pressure treatment

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Resource- and energy-saving manufacturing technologies based on pressure treatment