Electric heating – Metal heating – Of cylinders
Patent
1989-09-01
1990-04-10
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 75, 219 68, 148 9R, 148154, 83 16, H05B 602, B26D 710
Patent
active
049162780
ABSTRACT:
A method of severing a metal piece into parts in which electrical contacts engage the piece at the end of the severing line and high frequency electrical current is fed to the contacts for the length of time required to at least significantly reduce the tensile strength of the metal along the line, the current being fed to at least one of the contacts through a proximity conductor overlying the line. After such heating of the metal, the portions of the piece can merely be pulled apart. If shaping of the edge faces is desired, they can be pressed together while heated and malleable and after separation or can be pressed against an anvil while heated and malleable. Before separation, the portions on opposite sides of the line can be pushed toward each other or be moved transversely to each other. If the metal along the line is heated to "burning" temperature, the portions can be separated by burning out the heated metal with an oxygen containing gas.
REFERENCES:
patent: 3794805 (1974-02-01), Rudd
patent: 4007349 (1977-02-01), Burley
patent: 4537102 (1985-08-01), Balzer
patent: 4554029 (1985-11-01), Schoen et al.
Rudd Wallace C.
Udall Humfrey N.
Leung Philip H.
Thermatool Corporation
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