Evaluation of Periodic Wrinkle during Sheet Press Forming Utilizing Frequency Characteristic of Ultrasonic Wave

Abstract:

This study suggests a novel method to detect wrinkles using the frequency characteristic of reflected ultrasonic wave. The experimental apparatus was manufactured to simulate the press forming. A plate specimen possessing periodic wrinkles in a trapezoidal shape was also prepared to simulate actual wrinkles during the press forming process. These wrinkles affected the reflected wave of ultrasonic wave. The power spectrum of reflected wave at a frequency of 0.8 MHz was changed by the occurrence of wrinkles. The comparison of the frequency characteristics provided obvious difference between wrinkled and flat specimens. As a result, the present work confirmed that the frequency characteristic of reflected wave would detect the formation of wrinkles.

• Periodical: Defect and Diffusion Forum (Volume 382)
• Pages: 127-131
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.382.127
• Online since: January 2018
• Authors: Yuji Segawa*, Takuya Kuriyama, Hiroshi Harada, Yasuo Marumo, Tae Kyung Lee, Yasuhiro Imamura
• Keywords: Defect, Detect, Frequency Characteristic, In-Process Inspection, Sheet Press Forming, Ultrasonic Sensor, Wrinkle

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