Abstract
The circular blank with a hole in the center shows similar deformation mechanisms of material for cupping, bulging, hole expanding test, burring and stretch flange forming. In this report, a hole expanding test was carried out with attention to this point and the forming limit of stretch flange forming was examined of aluminum 1100-O and H24 sheets 1mm in thickness. Urethane die was used as an elastic tool so that approximately hydrostatic pressure operated on the material over punch shoulder. The experiment has shown that the pressure of the elastic tool is convenient to compress flange and prevents the material from cracking over punch shoulder. This function of the elastic tool increases the limiting drawing ratio, and hence is convenient to deep drawing, but decreases K.W.I values a little.
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