Method and device for examining clinched portion of tubular body

Patent metadata

Field	Value
Publication number	US-2022229020-A1
Application number	US-202017614527-A
Country	US
Kind code	A1
Filing date	Apr 13, 2020
Priority date	May 30, 2019
Publication date	Jul 21, 2022
Grant date	—

Abstract

The method for examining a clinched portion of a tubular body includes the steps of: giving an elastic vibration to a clinched body 90 formed by clinching a tubular body 91 with a clinch-target member 92; and acquiring, for each of a plurality of view areas 95 which differ from each other in the position in the circumferential direction of the tubular body 91, a vibration distribution optically and simultaneously measured within the view area 95 including a clinched portion 93 of the tubular body 91 and the clinch-target member 92, to determine whether or not the state of clinching is satisfactory over the entire clinched portion 93.

First claim

1 . A method for examining a clinched portion of a tubular body, comprising steps of: giving an elastic vibration to a clinched body formed by clinching a tubular body with a clinch-target member while the clinched body is in contact with a vibration source; and acquiring, for each of a plurality of view areas which differ from each other in a position in a circumferential direction of the tubular body, a vibration distribution optically and simultaneously measured within the view area including a clinched portion of the tubular body and the clinch-target member, to determine whether or not a state of clinching is satisfactory over the entire clinched portion.

2 . The method for examining a boded portion of a tubular body according to claim 1 , wherein, in each of the plurality of view areas, a measurement of the vibration distribution is performed while each of a plurality of the elastic vibrations which differ from each other in either a position on the clinched body at which the vibration is given, or a frequency of the vibration, or both, is given to the clinched body, and it is determined that the state of clinching at the clinched portion within the view area is satisfactory if all of the plurality of kinds of measured vibration distributions have a node of the vibration at the clinched portion.

3 . The method for examining a boded portion of a tubular body according to claim 1 , wherein the measurement of the vibration distribution is carried out by performing stroboscopic illumination of the view area and measuring a displacement in an out-of-plane direction of each point within the view area at three or more different phases of the vibration by controlling a timing of the elastic vibration and the stroboscopic illumination.

4 . A device for examining a clinched portion of a tubular body, comprising:
a vibration source configured to give an elastic vibration to a clinched body formed by clinching a tubular body with a clinch-target member while the clinched body is in contact with the vibration source; and a vibration distribution acquirer configured to acquire, for each of a plurality of view areas which differ from each other in a position in a circumferential direction of the tubular body, a vibration distribution optically and simultaneously measured within the view area including a clinched portion of the tubular body and the clinch-target member.

5 . The device for examining a clinched portion of a tubular body according to claim 4 , further comprising:
a clinching-state determiner configured to determine, at each of the plurality of view areas, whether or not a state of clinching at the clinched portion within the view area is satisfactory based on the vibration distribution acquired by the vibration distribution acquirer.

6 . The device for examining a clinched portion of a tubular body according to claim 4 , further comprising:
an illuminator configured to perform stroboscopic illumination of the view area; and a displacement measurement section configured to measure a displacement in an out-of-plane direction of each point within the view area at three or more different phases of the vibration by controlling a timing of the elastic vibration and the stroboscopic illumination.

7 . The method for examining a boded portion of a tubular body according to claim 2 , wherein the measurement of the vibration distribution is carried out by performing stroboscopic illumination of the view area and measuring a displacement in an out-of-plane direction of each point within the view area at three or more different phases of the vibration by controlling a timing of the elastic vibration and the stroboscopic illumination.

8 . The device for examining a clinched portion of a tubular body according to claim 5 , further comprising:
an illuminator configured to perform stroboscopic illumination of the view area; and a displacement measurement section configured to measure a displacement in an out-of-plane direction of each point within the view area at three or more different phases of the vibration by controlling a timing of the elastic vibration and the stroboscopic illumination.

Assignees

• Shimadzu Corp
• Kobe Steel Ltd

Inventors

• Hatahori Takahide
• Takubo Kenji
• Yoshida Koki
• Imamura Yoshihaya

Classifications

• G01M7/00 Primary

  Vibration-testing of structures; Shock-testing of structures (G01M9/00 takes precedence) · CPC title

• B23K31/00

  Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups B23K1/00 - B23K28/00 · CPC title

• G01N2291/2634

  cylindrical from outside · CPC title

• G01N29/2418

  using optoacoustic interaction with the material, e.g. laser radiation, photoacoustics (photoacoustic cells G01N21/1702; measuring characteristics of vibrations by using radiation-sensitive means G01H9/00; acousto-optical conversion techniques for short-range imaging G01S15/8965; sound-producing devices using laser bundle G10K15/046) · CPC title

• G01N29/041 Primary

  on the surface of the material, e.g. using Lamb, Rayleigh or shear waves · CPC title