Tool condition monitoring system

Details Tool condition monitoring system Tool condition monitoring system

1995-10-20

1996-12-24

Ramirez, Ellis B.

Boots, shoes, and leggings

73660, 340680, 36447415, 36447417, G05B 2302, G08B 2100

Patent

active

055879314

ABSTRACT:
A tool monitoring system monitors the condition of an electrically powered tool performing a cyclical operation. The tool monitoring system operates generally in two modes: learning mode and monitor mode. In learning mode, the tool monitoring system gathers statistical data on the power consumption of tools of the selected tool type during learning cycles. A power threshold is generated based upon the statistical data. The tool monitoring system then counts the number of crossings by each of the learning cycles of the power threshold and generates statistical data regarding the number of crossings. Preferably, the mathematical operation of wavelet packet transform is used to calculate the power threshold. Feature wavelet packets of the power consumption signal of the tool are calculated. The power consumption signal is then reconstructed from the feature wavelet packets and used to determine the power threshold. In monitor mode, the tool monitoring system counts the number of crossings of the power threshold by the power consumption signal of a tool in operation. The tool monitoring system identifies a worn tool when the number of crossings increases to a certain number relative to the crossings by the learning cycles.

REFERENCES:
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patent: 5247452 (1993-09-01), Ueda et al.
patent: 5407265 (1995-04-01), Hamidieh et al.
Feature Extraction and Assessment Using Wavelet Packets for Monitoring of Machining Process, Wu et al., no date given.

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