To correctly judge the generation of abnormality in plastic working.
In the working system provided with a plastic working device 10, an AE sensor 21 and an AE signal processing section 22, the AE signal processing section includes: an A/D converter 33; a frequency analysis unit 34 analyzing the frequency characteristics of digital AE signals, and calculating the powers to frequencies per unit time; a memory unit 38 memorizing data obtained regarding the powers to frequencies per unit time upon normal time by time series as standard data; and a difference calculation unit 35 calculating power differences with the standard data in each frequency of the digital AE signals detected per unit time, adding the power differences in each frequency, and calculating power differences per unit time, so as to calculate power differences by time series.
| JP2005305541A | 2005-11-04 | |||
| JP2007003385A | 2007-01-11 | |||
| JPH0542335A | 1993-02-23 | |||
| JPH0777519A | 1995-03-20 |
Jun Tsuruta
Tetsuro Shimada
Yoshio Mizutani
Koichi Itsubo
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