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1. (WO2015045537) EXTRUSION DIE FOR FORMING HOLLOW MATERIAL

Pub. No.:    WO/2015/045537    International Application No.:    PCT/JP2014/067285
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Sat Jun 28 01:59:59 CEST 2014
IPC: B21C 25/02
Applicants: NIPPON LIGHT METAL COMPANY, LTD.
日本軽金属株式会社
Inventors: HAYASHI Haisei
林 沛征
MOCHIZUKI Yuji
望月 雄次
Title: EXTRUSION DIE FOR FORMING HOLLOW MATERIAL
Abstract:
[Problem] To provide an extrusion die for forming a hollow material that makes it possible to extrude a billet comprising a high-strength alloy that has high extrusion force, particularly a high-strength aluminum such as the so-called 7000 series, and to easily form a hollow material having a partition wall provided to the interior thereof. [Solution] An extrusion die (10) is configured so as to comprise: a male-type member (20) that extrudes a billet on a downstream side and forms the inner shape of a material; and a female-type member (30) that forms the outer shape of the material. A billet guide hole (28) that guides one part of the billet toward the downstream side is provided to the central area of a mandrel section (23) that constitutes the male-type member (20). Four inner formation pieces (23) are mounted in a fixed manner to positions that face the downstream-side opening of the billet guide hole (28). The female-type member (30) is provided with an outer formation die hole (30B) that faces all of the outer peripheral surfaces of the inner formation pieces (23) and that forms the outer shape of the hollow material.