Abstract
An experimental study of the deep-drawing of ten sheet metals through a conical die is described. This is an important process in its own right and also as thefirst stage of a drawing and multiple ironing process. It is shown that the optimum die angle depends on whether the drawing process fails by fracture or by flange wrinkling. If the mode of failure is fracture then a high R-value is beneficial; if the mode of failure is flange wrinkling then the most important variable is the n-value. In the latter case a semi-empirical approach is adopted to demonstrate the relationships between blank diameter, punch diameter, punch profile-radius, sheet thickness and n-value.
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