Purpose. The comparison of different design schemes with simulation of upper bound method in combined radial-backward extrusion and investigation of power mode in extrusion process with hollow part such as cup of flange from solid billet are considered. Design/methodology/approach. The different kinematics modules are compared. The kinematics of velocity field and best kinematics modules such as triangular curved modules are defined. Linearization integrands dependencies are shown that inefficiencies due to difficulties in the selection of suitable approximate functions for a total volume of keystone modules. For getting upper bound ratings deformation forces in these modules are used approximate integration based on the Cauchy-Schwarz inequality. Findings. The comparison of theoretical and experimental in pressure deformation and metal flow speed between themselves and so the obtained results of finite element method are shown received dependences acceptability for technological calculations of power parameters and evaluation of forming parts. Originality/value. The resulting solutions are used for evaluating character of deformation billets receiving the filling of the die cavity and the possibility of the form stamped parts deviations such as dimple.
The results of studies of plasticity of metals at volumetric stress state are presented. Experimental data on the effect of hydrostatic pressure and its changes in the plasticity of metals are processed. The effect of the invariants of the stress tensor on the plasticity is shown. Here the process of samples loading is considered in the space of three dimensionless invariant characteristics of the stress-strain state. It is shown that the plasticity is affected by the first and second derivative of the indicators of stress state. It is also shown that the defor-mability criteria based on the linear theory of damage accumulation provide a significant deviation between the calculated and experimental results.
The article considers the design of the die to extrude hollow parts with an internal flange of the tubular blank. The description of the stamp and its design.
This article describes the mathematical model of the process combined radial-reverse part extrusion type of glass with a flange for identifying energy-power parameters of the process and explore the gradual and the final forming of the billet. It shows a comparative analysis of the phase-forming patterns based on the proposed computational scheme, finite element modeling and experimental data.
The article considers the design of the die to extrude hollow parts with an internal flange of the tubular blank. The description of the stamp and its design.
