Metal deforming – By application of fluent medium – or energy field – By kinetic energy of fluid or field
Patent
1989-12-15
1991-09-10
Larson, Lowell A.
Metal deforming
By application of fluent medium, or energy field
By kinetic energy of fluid or field
72707, 361155, B21D 106
Patent
active
050463454
ABSTRACT:
A power supply for use with an electromagnetic force system used for dent removal or proof load testing, wherein the power supply includes slow and fast current pulse systems. The slow current pulse system includes a capacitor bank which is charged up to 1000 volts, while the fast current pulse system includes a capacitor bank which is charged up to 10k volts. Control switches are provided for each system which result in discharge of the respective capacitor banks into a work coil adjacent the workpiece at selected times. A crowbar circuit is provided across the coil, and is triggered following discharge of the fast current pulse system. The crowbar circuit includes a series connection of several diodes to block the high negative reverse voltage and an SCR to block the low forward voltge, the SCR being triggered at the selected time to initiate conduction of the crowbar. An anti-parallel diode is connected across the SCR to prevent possible damage to the SCR caused by the rapid sequence of the reverse voltage and the rapidly rising current pulse.
REFERENCES:
patent: 3900770 (1975-08-01), Kaufman
patent: 4148091 (1979-04-01), Hansen et al.
patent: 4473862 (1984-09-01), Hill
patent: 4757419 (1988-07-01), Masaki
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