Abstract
Aluminum foil cups are used as food trays and kitchen accessories with superior strength and high rigidity generated by wrinkles on the cup wall and flange parts. Deep aluminum foil cups are also demanded in food and other industries. In this study, it aims to enhance the formability of circular cup with acceptable wrinkles drawn by using local heating and cooling deep drawing technique, so-called warm deep drawing, which can prevent fracture at punch shoulder. Specific experimental equipment was utilized and the warm deep drawing experiments under constant blank holder force method and constant gap method are conducted. Compared to the deep drawing test results at room temperature, it is seen that limiting drawing ratio (LDR) decreases in the case of constant blank holder force method. However, LDR is improved in the case of constant gap method. Consequently, it is shown that the formability of aluminum foil cups with wrinkles could be improved by using warm deep drawing technique.
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