| In recent years, Lightweight forming technology is developing rapidly.Aluminum alloy sheet drawn parts are used widely in the aerospace, automotive, butAluminum alloy material is poor in plasticity and formability, and it is difficult toform with conventional forming processes. Hydromechanical deep drawing is anadvanced soft mold forming technology, which greatly improves the sheet forminglimit, especially for complex-shaped parts.In this paper, aimed at the2A12aluminum alloy box-shaped parts,investigations were performed on the effects of process parameters by numericalsimulations and experiments, and forming limit of box-shaped parts has beenobtained with different edge corner radius.The forming process of box-shaped parts with different edge corner radius wassimulated by software ETA/Dynaform5.7. Effects of chamber pressure on thethickness distributions and defect types of different edge corner radius were studied.The stress-strain distribution was respectively analyzed during the process ofhydromechanical deep drawing, and the law of strain distribution was obtained. Theblanks with different chamfers were formed, by comparing minimum wall thicknessand strain distributions of the box-shaped parts, a reasonable determination of theblank chamfer is of great significance in improving the formability.Experiments were carried out and experimental results were analyzed, andexperimental results agree with numerical simulation results. The box-shaped partswith different cone angle were researched by experiment, and the thicknessdistribution and defects of box-shaped parts with different cone angle were analyzed.By adjusting the liquid chamber pressure and blank holding force, defects wereeffectively controlled.Through the rational optimization of chamber pressure, blank holding force andother parameters, forming limit of box-shaped parts was determined with differentedge corner radius. The interaction between the edge corner radius and straight edgewas summarized and analyzed. |
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