| 摘要 |
PROBLEM TO BE SOLVED: To provide a production technology which produces a barrel type cylindrical body of a cylindrical case, etc., in a good yield and is suitable for mass production. SOLUTION: A barrel type cylindrical body is formed through a process (ST01) which prepares a flat plate of a precipitation hardening stainless steel of a prescribed size, a process (ST02-05) in which the flat plate is subjected to deep drawing while applying an annealing process as required to a bottomed cylindrical body, a cutting process (ST07) in which the bottom part of the bottomed cylindrical body is cut to obtain a simple cylindrical body and a expanding process (ST08) in which a simple cylindrical body is expanded/reduced to obtain the barrel type cylindrical body. By this method, the flat plate is a start material to make a high yield possible. Mass productivity is improved because most of formings is done by press/spinning machines and machining is limited.
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