| 摘要 |
PROBLEM TO BE SOLVED: To improve accuracy in determining the quality of a clamping portion by simple means.SOLUTION: By moving a clamping tool 13 to a protrusion portion 2a side, the protrusion portion 2a is pressed by the clamping tool 13 to form a clamping portion 2d. Then, the clamping tool 13 is moved to the opposite side to the clamping portion 2d, and the clamping tool 13 is moved again to the clamping portion 2d side, thereby making the clamping tool 13 abut on the clamping portion 2d. The moving amount of the clamping tool 13 at the time of abutting is detected, and the quality of the clamping portion 2d is determined on the basis of the moving amount. |
