Papers by Keyword: Cup-Drawing

Abstract: Cup drawing, besides its importance as forming process, also serves as a basic test for the sheet metal formability. To determine the optimum values of the process parameters, it is essential to find their influence on the deformation behaviour of the sheet metal. Based on the predicted thickness and stress distribution of the deep drawn circular cup and analysis of process parameters by LS-DYNA software in the paper, it is evident that the minimum thickness is at the punch radius, which was the danger zone for breaking. BHF is the main influence factor of a axi-symmetric cup, according drawing theory, the curve of the variable blankholder force (VBHF) we designed could improve the formability of sheet. Further, it is shown mold radius has the greater influence on the deep drawing of blank sheet.

Abstract: Cup drawing of sheet material (carbon steel DC06 and aluminium alloy AA3103-O) is simulated using a Finite Element (FE) method configured as a hierarchical multi-scale model. It performs a two-way simulation of the interactions between the metal flow and the crystallographic textures of the polycrystalline material. In this, the evolution of the deformation textures is simulated by the Taylor and ALAMEL models, and this in every integration point of the FE mesh. The resulting textures have been compared with experimentally measured ones at different positions within the work-piece. An anisotropic constitutive model is used based on the Facet model identified from the current texture in every location by means of the Taylor and/or ALAMEL model. The updating procedure has been highly optimized. Simulated and experimental results (cup profiles, deformation textures) are compared. The effect of texture updating is assessed.

Abstract: An explicit integration algorithm using a texture-based plastic potential and isotropic hardening has been developed and implemented into a commercial explicit finite-element software program through a user material subroutine (VUMAT in ABAQUS/Explicit). Simulations of cup drawing of an IF-steel are presented and compared to both experimental data and calculation results obtained with a previously developed fully implicit approach (UMAT in ABAQUS/Standard). The explicit formulation has the advantage of being more stable, but local sheet thickness variations cannot be reproduced with the same accuracy.