Toyo Seikan Group Holdings, Ltd.

Nobuhisa Okabe

Hidekazu Tomaru

Hironori Oonishi

The present invention provides a deep-drawing method and a forming die therefor which can prevent the occurrence of cup side wall wrinkles and the collapse of the bottom during the process of deep-drawing a blank and which can increase the drawing ratio. A wrinkle pressing surface of a pressure pad () or an upper surface of a draw die () includes a flat inner edge surface (), a tapered surface () which becomes deeper as the surface advances from the flat inner edge surface toward an outer circumference, a deepest flat surface (), and a flat outer edge surface (), which are provided in that order from an inner edge through which a draw punch passes toward an outer edge.

Growing community of inventors

Yokohama, Japan

Nobuhisa Okabe