Materials Transactions Online

Materials Transactions, Vol.59 No.05 (2018) pp.799-804
© 2018 The Japan Society for Technology of Plasticity

Evaluation of Wrinkling States Using In-Process Ultrasonic Examination during Sheet Metal Forming

Ryota Kakinoki1, Yuji Segawa2, Yasuo Marumo3, Yasuhiro Imamura4, Tomohiro Nonaka5 and Yutaka Sakata5

1Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
2Department of Mechanical Engineering, National Institute of Technology, Miyakonojo College, Miyakonojo 860-8555, Japan
3Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan
4Technical Division, Faculty of Engineering, Kumamoto University, Kumamoto 860-8555, Japan
5Department of Integrated System Engineering, Nishinippon Institute of Technology, Fukuoka 800-0394, Japan

In press forming, sampling inspection has been performed during production. However, in sampling inspection, there is the possibility that defective products will proceed to the next process despite inspection. In this paper, we investigated a method for detecting wrinkle defects occurring during deep drawing in order to prevent the outflow of defective products. Deep-drawing tests were performed using a drawing die incorporating an ultrasonic transducer. During deep drawing, ultrasonic waves were irradiated to the interface between the die and the workpiece, and the occurrence of wrinkles was examined on the basis of ultrasonic reflection characteristics. The ultrasonic reflection intensity was changed by the occurrence of the wrinkles. The influence of wrinkle height and wrinkle wavelength on relative reflection intensity was shown. It was demonstrated that ultrasonic measurement is an effective method of detecting wrinkles during press forming.

[doi:10.2320/matertrans.P-M2018807]

(Received 2017/10/11; Accepted 2017/12/28; Published 2018/04/25)

Keywords: sheet metal forming, deep drawing, defect, wrinkle, in-process inspection, ultrasonic sensor, sound impedance, relative reflection intensity

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