Electric heating – Metal heating – Of cylinders
Patent
1985-03-05
1986-08-26
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1049R, 219 1079, 219 617, H05B 602
Patent
active
046084711
ABSTRACT:
An impeder for use in a mill for roll-forming tubing. The mill includes a feed station for supplying an elongated steel strip in flat form and a station where the strip is transversely bent from its planar condition causing the lateral edges of the strip to be brought together in abutting relationship. An induction coil is positioned about the bent portion of the strip for inducing current flow through the location where the lateral edges first abut to heat the lateral edges to plasticity. The mill also includes a weld rolls station where the plastisized lateral edges are firmly pushed together to complete welding of the tube. The impeder is disposed inside the induction coil adjacent the location where the lateral strip edges are first brought into abutting relationship. The impeder includes an outer shell made of a strong, heat-resistant material, a core disposed inside a shell and formed by an aggregation of ferromagnetic material, and components for causing passage of a coolant through the core material.
REFERENCES:
patent: 2644881 (1953-07-01), Schorg
patent: 2938993 (1960-05-01), Rudd
patent: 3379853 (1968-04-01), Domizi
patent: 3404441 (1968-10-01), Manabe et al.
patent: 3445616 (1969-05-01), Guyer
patent: 3619535 (1971-11-01), Sullivan
patent: 3648005 (1972-03-01), Rudd
patent: 4268736 (1981-05-01), Cuvelier
patent: 4314125 (1982-02-01), Nakamura
patent: 4443677 (1984-04-01), DeSaw
Byrd Lucid L.
Vollmuth Lawrence P.
Allied Tube & Conduit Corporation
Leung Philip H.
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