Extracting Acoustic Emission Signal Feature of Grinding Processing

Abstract:

Acoustic Emission (AE) may be defined as a transient elastic stress wave generated by the rapid release of strain energy in local area of material. To overcome the limitation of some traditional techniques, the AE technique, which provides high sensitivity and responding speed, were developed in the present paper. AE signature is usually difficult to be extracted and characterized in grinding process of 1Cr18Ni9Ti coatings due to their high hardness, great ductility, inhomogeneous structure and irregular surface with lots of hard points and pores. In this paper, AE signal of stationary grinding status before wheel-workpiece contact was characterized first, then AE signal of the grinding process was analyzed using root-mean-square (RMS) and power spectrum method. Results showed that before the contact occurred, the grinding signal is stable, with low amplitude and frequency ranging all frequency channels and no peak signal. However, when contact occurred, the RMS and spectrum of AE signal increased obviously and the bandwidth varied exquisitely between 100 KHz and 300 KHz. The real contact time between wheel and workpiece was about 0.5 to 1 ms.

• Periodical: Advanced Materials Research (Volumes 887-888)
• Pages: 1175-1178
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.887-888.1175
• Online since: February 2014
• Authors: Xiao Jing Huo*, Jia Xu Teng, Wen Di Wang, Ai Min Shen, Jun Wei Yang
• Keywords: Acoustic Emission (AE), Characterization, Grinding, Signal Processing

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