Керування параметрами ЕГ-навантаження для штампування листових деталей з мінімальним жолобленням
DOI:
https://doi.org/10.37142/2076-2151/2022-1(51)98Keywords:
forming, sheet articles, impulse loading, modelling, stress, strain, warping.Abstract
Taranenko M., Naryzhnyi O. Controlling parameters of electro-hydraulic loading at forming of sheet articles with minimal warping
Mechanism of distribution of residual stress, which appear at sheet article deformation, is considered. Modelling of electro-hydraulic (EH) forming is conducted for conditions of consequent local changing of shape of large-dimensional articles. This process is conducted in multi-contour electrohydraulic presses with multi-electrode discharge blocks. In presses of this type possibility of loading control in space and time is realized practically. Controlling of process is conducted by means of changing place and time of electrical discharges shifting with respect to each other.
Researches were conducted by means of application of numerical modelling with LS-DANA software and together with ALE method. Modelling was done in 3D-formulation with specific boundary conditions.
It is mentioned that at blank deformation by triple EH-discharges principal strains at points on upper, middle and lower blank surfaces differ by value and place of location with respect to loading epicenters.
It is shown that for reduction level of residual stress which lead to article warping one has to create cavity of an article with less intensive loading but with higher amount of loading cycles.
Results obtained are shown that the process of sheet blank deformation loaded with impulse loading field has mainly oscillative character due to passing longitudinal and lateral waves of deformation.
Modelling with short increment by time (~10-8 sec) has revealed that article deformation is complicated non-linear process and is accompanied with stress oscillations having different periods. To optimize forming process it is necessary to adjust blank behavior with loading frequency.
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