INFLUENCE OF DRAWING RATIO ON THICKNESS VARIATION ALONG THE WALLS OF DEEP DRAWN CUPS
Keywords:
Thickness variation, deep drawing, sidewalls of cup, thinningAbstract
Deep drawing is the process of converting a flat blank into cup shaped articles. In this process a punch forces the blank to take the shape of die cavity. In the deep drawn cups the thickness of the sheet metal varies throughout the walls of cup. This is undesirable as non uniform thickness leads to defects like cracks or failures. As thickness variation depends upon several parameters like limit drawing ratio, drawing force, sheet material, geometry of blank etc. it can be minimized by selecting optimum process parameters. In this work the effect of drawing ratio on the thickness distribution along the walls of deep drawn cup is performed. An experimental study is carried out using various drawing ratios, and materials which give small difference between maximum and minimum thickness distribution along the cup. It is found that the thickness variation (thinning) is maximum at the bottom corner radius of the cup which is a source of initial fracture.
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References
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