[14p-D311-1~8] 1.6 Ultrasonics

[14p-D311-2] Laser ultrasonic technique to detect cracks on directed energy deposition (DED) process

〇Harumichi Sato¹, Hisato Ogiso¹, Yoshihiro Yamashita², Yoshinori Funada² (1.AIST, 2.IRII)

Keywords:ultrasonics, nondestructive inspection, Additive manufacturing

The required specifications of mechanical parts for engines, transmissions, robot joint drive shafts, machine tool spindles, positioning stages, etc. are becoming more accurate year by year, and the delivery time is getting shorter. Many high-precision parts in those products are manufactured by grinding, and the finished precision of those parts is determined by the performance of the jig used at this time, so it is required to make the jig fast and accurately. Therefore, we are developing a technique to form a hard layer on the jig by directed energy deposition (DED) process. DED is one of additive manufacturing (AM) methods (3D printing). The hard layers made by DED might contain defects. The laser ultrasonic technique (LU) can apply to inspect samples with curved surface, so it is considered that LU is useful for the inspection. In this study, the authors made an AM object by DED, and detected defects in it by LU.