Metal deforming – By application of fluent medium – or energy field – By kinetic energy of fluid or field
Patent
1989-05-23
1991-01-22
Larson, Lowell A.
Metal deforming
By application of fluent medium, or energy field
By kinetic energy of fluid or field
72705, B21D 2614
Patent
active
049861026
ABSTRACT:
An electromagnetic dent remover having a tapped work coil (36) is provided. A first current pulse, I.sub.S, is applied to an inner and outer coil (48 and 46) to produce an electromagnetic field that exerts a repelling force on a conductive part (24). A second current pulse, I.sub.F, having a polarity opposite that of the I.sub.S current pulse and a rise time shorter than that of the I.sub.S pulse, is applied to the inner coil (48), which collapses the electromagnetic field associated with the inner coil (48) and causes a pulling force to be exerted on the part (24) by the inner coil (48). The work coil (36) is positioned over a dent in the conductive part (24) so that the pulling force produced by the inner coil (48) is concentrated on the dent and pulls the dent from the part (24). Simultaneously, the pulling force is counteracted by the repelling force produced with the outer coil (46). The repelling force stabilizes the part ( 24) to facilitate the removal of the dent. In addition to stabilizing the part (24), the repelling force created by the outer coil (46) may be used to remove convex deformations (20) of the dent.
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Hansen Karl A.
Hendrickson I. Glen
Larson Lowell A.
The Boeing Company
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