EXTRUSION DIES FOR FORMING A HOLLOW MATERIAL

WIPO Patent Application WO/2012/020603

A1

Even when extrusion-forming a billet comprising a high-extrusion-force, high-strength alloy—in particular, a high-strength aluminum alloy such as the so-called 7000 series—the disclosed extrusion dies (10) for forming a hollow material allow high-speed extrusion and prevent mandrel breakage, increasing service life. Said dies comprise: a male die (20) that extrudes a billet (B) in the downstream direction to form the interior shape of the final material, said billet having been sent from upstream; and a female die (30) that forms the exterior shape of the final material. The male die (20) comprises a mandrel (22) and a holder (25) that holds the outside thereof. The mandrel (22) is formed from an interior-forming part (23) and a bridge part (24) that supports said interior-forming part (23). The outer surface of the tip of the bridge part (24) engages with the inner surface of the holder (25), said engagement surface being angled such that the downstream side thereof, in the extrusion direction, approaches the center of the dies.

MOCHIZUKI YUJI (JP)
HAYASHI HAISEI (JP)
SAITO SHIGENORI (JP)
SATA HIROAKI (JP)
SUGIHARA HIROFUMI (JP)
WATANABE MAKOTO (JP)
OKANIWA SHIGERU (JP)
KOMATSU KEN (JP)

PCT/JP2011/064099

February 16, 2012

June 21, 2011

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NIPPON LIGHT METAL CO (JP)
NIKKEIKIN ALUMINIUM CORE TECH (JP)
MOCHIZUKI YUJI (JP)
HAYASHI HAISEI (JP)
SAITO SHIGENORI (JP)
SATA HIROAKI (JP)
SUGIHARA HIROFUMI (JP)
WATANABE MAKOTO (JP)
OKANIWA SHIGERU (JP)
KOMATSU KEN (JP)

B21C25/02

JPH0220614A	1990-01-24
JP2010125475A	2010-06-10
JPH07171614A	1995-07-11

TAKAHASHI ISAMU (JP)
Isamu Takahashi (JP)

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