Electric heating – Metal heating – Of cylinders
Patent
1988-11-16
1991-02-05
Pellinen, A. D.
Electric heating
Metal heating
Of cylinders
B23K 1301, H01T 120
Patent
active
049907328
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
1. Background of the Invention
This invention relates to working and welding of metals by strong magnetic fields and in particular to discharge devices for magnetic-pulse working and welding of metals.
2. Description of the Prior Art
A vital problem in the field of high-current switching equipment is creation of an air controlled high-current low-inductance (to 15 nH) spark discharge device allowing switching of currents of up to 600,000 A and having working electrodes capable of withstanding at least 10.sup.5 switches.
High priority of such a problem is due in large measure to the fact that air controlled dischargers arc at present widely used in magnetic-pulse installations (cf. USSR Inventor's Certificate No. 534,004, Cl. HOIT 5/00, 1974), which have superseded vacuum dischargers despite such apparent advantages thereof as a longer service life of working electrodes and a lower internal inductance.
However, vacuum dischargers call for the utilization of intricate equipment comprising vacuum pumps, a factor generally limiting their use in high-capacity installations.
There is known a discharge device for magnetic-pulse working and welding of metals (cf. USSR Inventor's Certificate No. 524,267, Cl. HOIT 1/00, 1973), comprising a discharge chamber having a cover and accommodating two working electrodes and an igniter electrode, said electrodes being arranged coaxially, an insulating liner being interposed between the working electrodes, one of said working electrodes being electrically connected to a positive terminal of a capacitor bank, while the other working electrode is connected to a negative terminal of said capacitor bank via an inductor.
However, the working electrodes and the igniter electrode in the aforesaid device are disposed on one side of a dielectric surface, and reverse current leads are arranged on the other side of the dielectric.
An insulated current supply screen localizing a plasma discharge is arranged between the reverse current lead and the dielectric.
However, the arrangement of the working electrodes on the surface of the dielectric in an area subjected to strong temperature and dynamic effects of the plasma rapidly disables the dielectric material and fails to ensure adequate stability of a discharge channel. Consequently, internal inductance of the known device is unstable, that is, parameters of a discharge circuit vary, which is a limiting factor. Inasmuch as the aforementioned device does not include reliable insulation means, its working electrodes may not be durable. Stated differently, the discharger construction is unfit for stock or mass production.
DISCLOSURE OF THE INVENTION
The object of the present invention is to create a discharge device for magnetic-pulse working and welding of metals, in which a new embodiment and arrangement of working electrodes and an igniter electrode would allow switching currents no less than 600,000 A, with the working electrodes suited to withstand at least 10.sup.5 switchings, and ensure reliable and stable operation of said igniter electrode, stabilizing a plasma discharge channel.
There is provided a discharge device for magnetic-pulse working and welding, comprising a discharge chamber having a cover and accommodating two working electrodes and an igniter electrode, an insulating liner being placed between the working electrodes, one of said working electrodes being electrically connected to a positive terminal of a capacitor bank, while the other working electrode is connected to a negative terminal of the capacitor bank via an inductor. According to the invention, one of the working electrodes connected through current-supply elements to the negative terminal of the capacitor bank comprises a current-carrying portion interconnected with a working portion of said working electrode, which is T-shaped, while the other working electrode, separated from the first working electrode by the insulating liner and disposed concentrically therewith, represents a sleeve, one end of which, facing the working portion o
REFERENCES:
patent: 2964679 (1960-12-01), Schneider et al.
patent: 3007072 (1961-10-01), McGinn et al.
patent: 3794805 (1974-02-01), Rudd
patent: 3869593 (1975-03-01), New et al.
patent: 4150274 (1979-04-01), Minin et al.
Chudakov Vyacheslav A.
Dudko Daniil A.
Evans Geoffrey S.
Pellinen A. D.
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