Title:
MANUFACTURING METHOD FOR ALUMINIUM ALLOY SUBSTRATE FOR MAGNETIC DISK, AND ALUMINIUM ALLOY SUBSTRATE FOR MAGNETIC DISK
Document Type and Number:
Japanese Patent JP3960533
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a manufacturing method for an aluminium alloy substrate for a magnetic disk, in which flatness is reduced and which is suitable for promoting high recording density of a magnetic disk and to provide the aluminium alloy substrate for the magnetic disk.
SOLUTION: In a method for manufacturing an aluminium alloy substrate for magnetic disk comprising a punching process manufacturing an aluminium alloy substrate by punching an aluminium alloy plate in a doughnut shape, and a press annealing process for performing annealing this aluminium alloy substrate with a load applied on it, the punched aluminium alloy substrate has plate thickness area sum of the prescribed value or less.
Inventors:
Ryosuke Higuchi
Application Number:
JP2002222015A
Publication Date:
August 15, 2007
Filing Date:
July 30, 2002
Export Citation:
Assignee:
KABUSHIKI KAISHA KOBE SEIKO SHO
International Classes:
B21D1/10; G11B5/84; C22F1/00; C22F1/04; G11B5/73; (IPC1-7): G11B5/84; B21D1/10; C22F1/04; G11B5/73; //C22F1/00
Domestic Patent References:
| JP8212543A | ||||
| JP10328940A | ||||
| JP63157841A |
Attorney, Agent or Firm:
Isono Dozo