Eddy current apparatus and method for controlling a rod mill on

Details Eddy current apparatus and method for controlling a rod mill on Eddy current apparatus and method for controlling a rod mill on

1986-08-18

1989-02-28

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Combined

72 10, 72 33, 324240, 324241, 346 33F, 364472, 364507, 377 20, G01N 2790, B21B 3700, B21C 5100, G01D 900

Patent

active

048089265

ABSTRACT:
Method and apparatus for monitoring a rod mill and flexible wire drawn and annealed from a stiff coil of rod in the rod mill are disclosed. The fault signals provided by an eddy-current tester are counted on a per unit time basis in order to permit the detection of rod mill problems before serious deterioration of the mill occurs. This is accomplished by direct observation of an increasing rate of fault signal occurrence. A totalized fault signal count is also provided to aid in detecting low quality wire. This is accomplished by direct observation of uniformly high levels of fault signals. A control function is disclosed whereby the rod mill is shutdown in the presence of a high rate of increase in fault signal occurrences. A "change coil" message may be sent upon detecting uniformly high levels of faults. Fault signals are stored and identified for purposes of traceability. The invention is broadly applicable in other eddy-current testing contexts, that is, other than that context specifically disclosed for the best mode embodiment.

REFERENCES:
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patent: 3823370 (1974-07-01), Pendleton et al.
patent: 3904957 (1975-09-01), Griese
patent: 3983371 (1976-09-01), Siranni et al.
patent: 4167004 (1979-09-01), Schenck et al.
patent: 4209744 (1980-06-01), Gerasimov et al.
patent: 4399354 (1983-08-01), Schaeffer
patent: 4615195 (1986-10-01), Vogel et al.

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