International Journal of Earth Sciences and Engineering

Yuji Segawa ¹, Takuya Kuriyama ², Yasuo Marumo ³, Taekyung Lee ⁴, Yasuhiro Imamura ⁵, Tomohiro Nonaka ⁶, Yutaka Sakata ⁷

Affiliations
1 Department of Mechanical Engineering, National Institute of Technology, Miyakonojo College, 473-1, Yoshio-cho, Miyakonojo, Miyazaki-885-8567, JP
2 Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-Ku, Kumamoto-860-8555, JP
3 Kumamoto University, 2-39-1, Kurokami, Chuo-Ku, Kumamoto-860-8555, JP
4 Magnesium Research Center, Kumamoto University, 2-39-1, Kurokami, Chuo-Ku, Kumamoto-860-8555, JP
5 Technical Division, Kumamoto University, 2-39-1, Kurokami, Chuo-Ku, Kumamoto-860-8555, JP
6 Department of Integrated System Engineering, Nishinippon Institute of Technology, 1-11, Aratsu, Kanda-Machi, Miyako-Gun, Fukuoka-800-0344, JP
7 Department of Integrated System Engineering, Nishinippon Institute of Technology, JP

Abstract

It is difficult to completely prevent the formation of defects in metal press forming, unless inspecting the entire products. This study suggests an in-process inspection using an ultrasonic measurement in order to avoid such a problem. This method is effective for detecting wrinkles formed in a material during the process. A numerical analysis clarified the relationship between wrinkle shapes and the reflection behaviour of ultrasonic waves. In this study, we developed an experimental apparatus that provided quantitative data explaining the relationship between ultrasonic reflection intensity and the wrinkle shapes. The die of the developed apparatus was in sufficient contact with the specimen machined into the wrinkle shape. The ultrasonic reflection characteristics varied by the wrinkle characteristics.

Keywords

Press Forming, Defect Detect, Wrinkle, In-Process, Ultrasonic Measurement.

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Kota Kawamura ¹, Shunta Mori ¹, Yasuo Marumo ², Taekyung Lee ³, Yasuhiro Imamura ³, Takanori Masu ⁴, Akikazu Eto ⁴

Affiliations
1 Graduate School of Science and Technology, Kumamoto University, 2-39-1, Kurokami, Chuo-Ku, Kumamoto-860-8555, JP
2 Kumamoto University, 2-39-1, Kurokami, Chuo-Ku, Kumamoto-860-8555, JP
3 Magnesium Research Center, Kumamoto University, 2-39-1, Kurokami, Chuo-Ku, Kumamoto-860-8555, JP
4 Ajimu Perlite Co. Ltd., Yamaga, Kitsuki, Oita-879-1313, JP

Abstract

This study suggests a molding technology of obsidian perlite powder to improve mechanical properties. Molding experiment of obsidian perlite and characteristic test of molded body were carried out. By examining the characteristics and trends of the perlite product, we show the basic data on the experiment of the perlite product.

Keywords

Obsidian Perlite, Molding, Mechanical Properties.

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