Metal working – Method of mechanical manufacture – Disassembling
Patent
1991-05-20
1992-06-02
Echols, P. W.
Metal working
Method of mechanical manufacture
Disassembling
294261, 29890031, 29447, B23P 1902
Patent
active
051175487
ABSTRACT:
An apparatus and method for loosening a mechanical plug in a tube. A cartridge having a nose portion, central portion formed from a material that produces an exothermic reaction when ignited, and a base is inserted into the plug to be loosened and removed. An insulated wire extends through the base into the central portion and is connected to a resistive noninsulated wire positioned in the central portion. Sending an electrical current through the wiring causes the noninsulated wire to heat up rapidly. The rapid heat buildup initiates an exothermic reaction in the central portion. The heat generated causes stress conditions in the plug that exceed plug yield and results in a stress relief condition in the plug where the diameter of the plug is reduced. This loosens the plug in the tube and reduces pulling forces needed to remove the plug from the tube.
REFERENCES:
patent: 3900939 (1975-08-01), Greacen
patent: 4573248 (1986-03-01), Hackett
patent: 4829660 (1989-05-01), Everett et al.
patent: 4903392 (1990-02-01), Stickel et al.
patent: 4976307 (1990-12-01), Hall et al.
patent: 5022136 (1991-06-01), Tremmel
Griffith John C.
Gutzwiller James E.
Bryant David P.
Echols P. W.
Edwards R. J.
LaHaye D. Neil
The Babcock & Wilcox Company
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