초록 ▼

The apparatus includes a driver (86). The driver (86) includes a front portion (90) which is adapted to receive a riveting die (92), and a rear portion (88) which is a copper plate. The copper plate (88) is receptive to the establishment of magnetic field currents therein. The actuator further inclu

The apparatus includes a driver (86). The driver (86) includes a front portion (90) which is adapted to receive a riveting die (92), and a rear portion (88) which is a copper plate. The copper plate (88) is receptive to the establishment of magnetic field currents therein. The actuator further includes a coil (72) which is positionable in close proximity to the copper plate (88) of the drive (86). The apparatus further includes a bank of capacitors having a stored charge so as to produce a current pulse through the coil (72) when the capacitors are connected to the coil (72). Still further, the apparatus includes a control means for selectively connecting the stored charge from the capacitors to the coil. The copper plate (88) is relatively thick compared to that used in high voltage electromagnetic actuators, such that the present apparatus requires only a relatively low voltage in order to produce the required high forces to accomplish the desired riveting.

대표청구항 ▼

A high energy electromagnetic pulse actuator, comprising: an actuator means, including (a) a river having a first portion which is receptive to the establishment of eddy currents therein and a second portion adapted to receive a tool or the like for metal forming or other high force impact work on a

A high energy electromagnetic pulse actuator, comprising: an actuator means, including (a) a river having a first portion which is receptive to the establishment of eddy currents therein and a second portion adapted to receive a tool or the like for metal forming or other high force impact work on a workpiece, and (b) a coil positionable in close proximity to said first portion of said driver; a source of stored charge defining a selected, relatively low voltage, adapted to produce a current pulse through the coil when connected thereto; control means for selectively connecting the stored charge to the coil to produce a relatively large, short duration current pulse in the coil which in turn results in the creation of a high energy, rapidly changing magnetic field and the subsequent induction of eddy currents in the first portion of said driver, wherein said first portion of the driver is configured so as to reduce the axial diffusion of the rapidly changing magnetic field to such an extent that the current pulse in the coil which is produced by the relatively low voltage still results in a magnetic force pulse large enough to repel the driver away from the coil toward the workpiece with sufficient momentum to accomplish the desired impact work.