Abstract
With a view to regarding deep drawing as a new process for fabricating bottomless tubular elements, a deep drawing test was conducted with thick aluminum material. Two diameters of punches were used for a tapered die during one stroke. The diameter of the first punch was larger than the inner diameter of the straight part of the die and the diameter of the second punch was smaller than the inner diameter. Since the first punch was used only for the die tapered region before punch exchange, the limiting drawing ratio and cup height was increased efficiently.
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