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Title:
MAGNESIUM-BASE ALLOY SCREW AND METHOD OF MANUFACTURING THE SAME
Document Type and Number:
WIPO Patent Application WO/2004/113742
Kind Code:
A1
Abstract:
[PROBLEMS] To provide a method of manufacturing a magnesium-base alloy screw capable of manufacturing, with high productivity, a screw formed of a magnesium-base alloy with excellent strength and the magnesium-base alloy screw. [MEANS FOR SOLVING PROBLEMS] The method comprises a head forging step for manufacturing a screw blank by performing a warm head working to form a screw head part on a wire formed of the magnesium-base alloy obtained by drawing and a rolling step for manufacturing the screw by performing a warm rolling working to form screw threads in the screw blank. In the head forging step, the head working is performed by using a holding die fixing the wire and a punch forming the screw head part, the holding die and the punch are heated, and at least the holding die is heated to a temperature of 140 to 250&ring C to heat the wire to a temperature of 140 to less than 250&ring C.

Inventors:
OISHI YUKIHIRO (JP)
KAWABE NOZOMU (JP)
HASHIMOTO KENZABURO (JP)
FUKUDA KENJI (JP)
Application Number:
PCT/JP2004/008342
Publication Date:
December 29, 2004
Filing Date:
June 15, 2004
Export Citation:
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Assignee:
SUMITOMO SEI STEEL WIRE CORP (JP)
OISHI YUKIHIRO (JP)
KAWABE NOZOMU (JP)
HASHIMOTO KENZABURO (JP)
FUKUDA KENJI (JP)
International Classes:
B21H3/06; B21J1/06; B21J5/00; B21K1/46; B21K27/06; C22C23/02; C22F1/00; C22F1/06; F16B33/00; F16B35/00; (IPC1-7): F16B35/00; C22C23/00; C22F1/06; B21H3/06; B21K1/56; B21J5/00
Foreign References:
JPH07278717A1995-10-24
JPH05504602A1993-07-15
JPS60221142A1985-11-05
JPH11172359A1999-06-29
JP2000343178A2000-12-12
Other References:
See also references of EP 1640622A4
Attorney, Agent or Firm:
Yamano, Hiroshi (10F ASTRO Shin Osaka 2 Bldg., 1-3, Nishinakajima 6-chome, Yodogawa-k, Osaka-shi Osaka, JP)
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