Journal of the Korean Society of Manufacturing Technology Engineers (한국생산제조학회지)

The Korean Society of Manufacturing Technology Engineers (한국생산제조학회)
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Stamping Tool Wearing Analysis by Time-Frequency Analysis

시간-주파수 분석에 의한 금형 마모 분석

  • 이창희 (넥센타이어 연구개발본부 제품펑가팀) ;
  • 한호영 (충북대 대학원 정밀기계공학과) ;
  • 서건석 (포스코 선재부 기술개발팀) ;
  • 김용연 (충북대학교 기계공학부)
  • Received : 2010.03.15
  • Accepted : 2010.06.07
  • Published : 2010.06.15
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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

References

  1. Lee, E. B., and Kim, J. D., 1993, "A Study on the Prediction of Mirror-Like Surface Generation by Frequency Analysis of Cutting Force and Simulation," Journal of KSME, Vol. 17, No. 3, pp. 576-585.
  2. Kim, J. D., and Lee, E. B., 1993, "A Study on the Modeling of Tool Motion and High Accuracy Surface Generation by Use of Cutting Force Signal," Journal of KSME, Vol. 17, No. 8, pp. 1951-1962.
  3. Kwak, J. S., and Song, J. B., 2000, "Estimation of the Ground Surface Roughness Applied by Acoustic Emission Signal," Journal of KSPE, Vol. 17, No. 4, pp. 240-246.
  4. Kim, J. D., Kim, S. R., Kim, H. Y., and Ahn, J. H., 2001, "Development of Acoustic Emission Sensor Using Piezoelectric Elements and Monitoring System for Polishing Process," Proceedings of KSPE conference, April, pp. 560-565.
  5. Kim, W. I., Wang, D. H., and Kim, Y. S., 2002, "Behaviors of Cutting Force and Acoustic Emission in Different Helix Angle End Milling," Journal of KSMT, Vol. 1, No. 1, pp. 15-22.
  6. Ertekin, Y. M., Kwon, Y., and Tseng, T., 2003, "Identification of Common Sensory Features for the Control of CNC Milling Operations under Varying Cutting Conditions," International Journal of Machine Tools & Manufacture, Vol. 43, pp. 897-904. https://doi.org/10.1016/S0890-6955(03)00087-7
  7. Axinte, D. A., Gindy, N., Fox, K., and Unanue, I., 2004, "Process Monitoring to Assist the Workpiece Surface Quality in Machining," International Journal of Machine Tools & Manufacture, Vol. 44, pp. 1091-1108. https://doi.org/10.1016/j.ijmachtools.2004.02.020
  8. Ganesan, R., Das, T. K., Arun, K., and Kumar, A., 2003, "Wavelet-Based Identification of Delamination Defect in CMP(Cu-Low k) Using Nonstationary Acoustic Emission Signal," IEEE Transactions on Semiconductor Manufacturing, Vol. 16, No. 4, pp. 677-685. https://doi.org/10.1109/TSM.2003.818975
  9. Kwak, J. S., and Ha, M. K., 2002, "Intelligent Diagnosis of Grinding State Using AE and Power Signals," Journal of the Korean Society for Power System Engineering, Vol. 6, No. 2, pp. 60-67.
  10. Kwak, J. S., and Ha, M. K., 2004, "NeuraJ Network Approach for Diagnosis of Grinding Operation by Acoustic Emission and Power Signals," Journal of Materials Processing Technology, Vol. 147, pp. 65-71. https://doi.org/10.1016/j.jmatprotec.2003.11.016
  11. Godin, N., Huguet, S., Gaertner, R., and Salmon, L., 2004, "Clustering of Acoustic Emission Signals Collected during Tensile Tests on Unidirectional Glass/Polyester Composite Using Supervised and Unsupervised Classifiers," NDT&E International, Vol. 37, pp. 253-264. https://doi.org/10.1016/j.ndteint.2003.09.010
  12. Rhee, Z., 2007, "A study on the Wavelet Transform of Acoustic Emmision Signals Generated from Fusion-Welded Butt Joints in Steel during Tensile Test and its Applications," TKSMTE, Vol. 16, No. 1, pp. 26-32
  13. Kim, Y. Y., and Lee, C. H., 2007, "An Investigation of Acoustic Signal Characteristics in Turning of Aluminum," Journal of KSNVE, Vol. 17, No. 6, pp. 507-514. https://doi.org/10.5050/KSNVN.2007.17.6.507
  14. Kim, Y. Y., 2009, "Characterization of Acousto-Ultrasonic Signals for Stamping Tool Wear," Journal of KSNVE, Vol. 19, No. 4, pp. 386-392. https://doi.org/10.5050/KSNVN.2009.19.4.386