Title:
MANUFACTURE OF FLAT TUBE
Document Type and Number:
Japanese Patent JP2678963
Kind Code:
B2
Abstract:
PURPOSE: To make a flat tube of flexible tube used in an internal structure of a nuclear fusion reactor the uniform thickness-walled tube, and to manufacture the tube with high reliability.
CONSTITUTION: Dies 4, 4' are divided into heating zones of 1) to 9)..., each heating zone is heated uniformly as much as possible, the gas pressure is impressed in the most suitable pattern of the gas pressure impression of try and error following the simulation, further the super-plastic forming process is executed by dividing the process into plural steps of a prescribed number, executing the super-plastic forming to a work with use of the die matching the work in each step successively, and after completing one step, the next step is started, thus the process comprises respective steps independent of each other. Then, in order to obtain a multilayered flexible tube, each single layer tube 13, 13', 13'' is coated with lubricant by spraying every time respective tubes are laminated on each other. Therefore, the wall thickness of the flat tube 2 is made uniform and the thin walled part is not generated, the generation of break is prevented and the reliability of the flexible tube is increased.
Inventors:
Kudo Masa
Shinya Iio
Ryozo Hirata
Shinya Iio
Ryozo Hirata
Application Number:
JP31443392A
Publication Date:
November 19, 1997
Filing Date:
October 30, 1992
Export Citation:
Assignee:
Kawasaki Heavy Industries, Ltd.
International Classes:
B21C37/15; B21D26/033; B21D26/047; B21D26/051; B21D26/055; (IPC1-7): B21D26/02; B21C37/15
Domestic Patent References:
| JP4143024A |
Attorney, Agent or Firm:
Tomita Koharu
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