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Stamping Tool Wearing Analysis by Time-Frequency Analysis  

Lee, Chang-Hee (넥센타이어 연구개발본부 제품펑가팀)
Han, Ho-Young (충북대 대학원 정밀기계공학과)
Seo, Geun-Seok (포스코 선재부 기술개발팀)
Kim, Yong-Yun (충북대학교 기계공학부)
Publication Information
Journal of the Korean Society of Manufacturing Technology Engineers / v.19, no.3, 2010 , pp. 407-413 More about this Journal
Abstract
This paper reports on the research which analyzes acoustic signals acquired in progressive compressing, hole blanking, and burr compacting process. An acoustic sensor was set on the bed of hydraulic press. Acoustic signal is generated from progressive stamping process. First the signal acquired from the unit process; compressing, blanking or compacting, is studied by Fourier Transform and Short Time Fourier Transform. The blanking process emitted ultrasonic signal with more than 20kHz, but the compressing and compacting processes emitted acoustic signals with lower than 10kHz. The combined signals periodically acquired right after the tool grinding were then analyzed. 70-80kHz signals appeared in time-frequency domain, but not in the frequency domain, the magnitude of which was related to the tool wear. Short Time Fourier Transform made up for the Fourier Transform in analyzing the emitted signal for stamping process in the ultrasonic domain.
Keywords
Compressing process; Blanking process; Deburring process; Frequency spectrum; Short time frequency analysis;
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Times Cited By KSCI : 4  (Citation Analysis)
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