Electric heating – Metal heating – Of cylinders
Patent
1979-12-17
1982-11-16
Reynolds, B. A.
Electric heating
Metal heating
Of cylinders
219 1075, 219 1043, 219 1079, H05B 610, H05B 640
Patent
active
043596207
ABSTRACT:
An induction heating apparatus for heating an electrically conductive workpiece, comprising a C-shaped core made of a material having a high magnetic permeability and having two closely opposed tapered ends, an exciting coil surrounding the core, and a circuit for supplying a periodic voltage to the coil so as to cause a varying magnetic field to be produced in the core and to efficiently focus a field of high flux density between its two ends. In one embodiment the core is made of ferrite, a capacitance is connected with the exciting coil to form a resonant circuit, and circuitry is provided for detecting the phase of the current flowing in the resonant circuit and for controlling the frequency and phase of the periodic voltage supplied to the resonant circuit so as to maintain the circuit in resonance. In other embodiments, one of the two ends of the core is mounted on a slidable ram portion, which can be moved toward and away from the other end of the core, and electrically insulating workholders can be mounted on each end of the core to hold a workpiece in place as the ends of the core are pushed toward each other.
REFERENCES:
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patent: 1996502 (1935-04-01), Brown
patent: 2503429 (1950-04-01), Ziegler
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patent: 2945112 (1960-07-01), Scott
patent: 3391329 (1968-07-01), Meyer
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patent: 3798403 (1974-03-01), Mitchell et al.
patent: 3845268 (1974-10-01), Sindt
patent: 4017701 (1977-04-01), Mittelmann
AMP Incorporated
Leung Philip H.
Raring Frederick W.
Reynolds B. A.
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