Title:
METHOD FOR COMPUTING TUBE EXPANDING RATIO
Document Type and Number:
Japanese Patent JP3670438
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for computing tube expanding ratio by which the expanding ratio of a tube can be found easily and accurately even when the wall thickness of the tube is as thin as ≤0.5 mm.
SOLUTION: Before and after a tube 11 is expanded by putting the tube 11 over the putting-over holes 14 and 15 of tubesheets 12 and 13, an ultrasonic probe 19 is inserted into the tube 11 and ultrasonic waves are oscillated toward the internal surface of the tube 11 from the probe 19. Then bottom face echo multiplex reflected wave signals are received and subjected to Fourier transformation and the wall thicknesses of the tube 11 before and after expansion are measured form the Fourier-transformed frequency data. Finally, the expanding ratio of the tube 11 is computed from the computed wall thicknesses.
Inventors:
Masami Koike
Nakashima Eisaku
Akihiro Sato
Ryota Kajiki
Motonori Yasunaga
Nakashima Eisaku
Akihiro Sato
Ryota Kajiki
Motonori Yasunaga
Application Number:
JP8740497A
Publication Date:
July 13, 2005
Filing Date:
March 21, 1997
Export Citation:
Assignee:
New Japan Nondestructive Inspection Co., Ltd.
International Classes:
G01B17/02; G01B21/32; (IPC1-7): G01B17/02
Domestic Patent References:
| JP51910A | ||||
| JP365608A | ||||
| JP245755A | ||||
| JP6283607A | ||||
| JP6082910A |
Attorney, Agent or Firm:
Fujio Nakamae