| 摘要 |
PROBLEM TO BE SOLVED: To provide a square tube which can be used for an electronic component, and is excellent in the dimensional accuracy. SOLUTION: The subject method is for manufacturing a square tube, in which a round tube comprising a kovar alloy is drawn to a rough square tube by cold drawing, and then finished to the square tube by cold drawing. The thickness of corner parts in the rough square tube obtained from the round tube is thinner than that in the round tube. After applying heat treatment to the rough square tube to relieve the stress, drawing work is applied thereto to make the thickness of the corner parts in the finished square tube thinner than that in the rough square tube, and to make the difference among short side part Rd (cross-sectional area reduction rate: %), long side part Rd (cross-sectional area reduction rate: %), and corner part Rd (cross-sectional area reduction rate: %) 2% or less. When at least one drawing work is applied to the rough square tube, it is necessary that, after applying heat treatment to the rough square tube obtained right before to relief the stress, the rough square tube having thinner corner parts than the rough square tube is drawn. COPYRIGHT: (C)2006,JPO&NCIPI
|
