Nippon Light Metal Company, Ltd.

Nikkeikin Aluminium Core Technology Company Ltd.

Kenji Yuza

Yuji Mochizuki

Shigenori Saito

Hiroaki Sata

Hirohumi Sugihara

Haisei Hayashi

An extrusion die is provided with a male die through which a billet is extruded from an upstream side to a downstream side and, the male die adapted for forming an inside shape of a hollow material; and a female die for holding the male die and forming an outside shape of the hollow material. The male die is formed of a spider and a holder for holding the spider. The spider is formed of a mandrel and a plurality of bridge parts for supporting the mandrel, and enabling a distal-end outer peripheral surface to engage with a bridge-holding surface. The distal-end outer peripheral surface of each of the bridge parts and the bridge-holding surface of the holder are joined by shrink-fitting.

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Tokyo, Japan

Kenji Yuza