Title:
METHOD OF PREPARING BASE FOR MEMORY DISK
Document Type and Number:
WIPO Patent Application WO/1987/004094
Kind Code:
A1
Abstract:
A method of preparing a base for a memory disk, characterized by providing surfaces of super precision, by coining a blank material coated with nonmagnetic metal as undercoating on a nonmagnetic metal base by means of two dies having smooth pressing surfaces within a mandrel and a die ring which confine the spreading of the material.
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Inventors:
COE THOMAS U (US)
YAMAZAKI ATSUSHI (JP)
KRISHNAN CHRIS (US)
YAMAZAKI ATSUSHI (JP)
KRISHNAN CHRIS (US)
Application Number:
PCT/JP1987/000004
Publication Date:
July 16, 1987
Filing Date:
January 05, 1987
Export Citation:
Assignee:
FALCORE CO LTD (JP)
International Classes:
B21D31/00; B21D1/06; B21D22/02; G11B5/84; G11B23/00; (IPC1-7): B21D3/16; B21D21/00; B21D22/02; G11B5/84
Foreign References:
| JPS61186122A | 1986-08-19 | |||
| JPS56165528A | 1981-12-19 |
Other References:
OTA TETSU, "Press Kakogata Jitsuyo Binran", (15.10.1971), JITSUGYO TOSHO, p. 307-308.
YAMAMOTO HIROICHI, "Shiritai Asshuku Kako Kanagata", (10.08.1971), JAPAN MACHINIST-SHA, p. 18-20.
SOSEI KAKO KENKYUKAI, PRESS BINRAN HENSHU IINKAI, "Press Binran", (01.04.1985), MARUZEN, p. 181-183.
YAMAMOTO HIROICHI, "Shiritai Asshuku Kako Kanagata", (10.08.1971), JAPAN MACHINIST-SHA, p. 18-20.
SOSEI KAKO KENKYUKAI, PRESS BINRAN HENSHU IINKAI, "Press Binran", (01.04.1985), MARUZEN, p. 181-183.
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