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.

Low voltage electromagnetic pulse actuator

A riveting apparatus and method wherein riveting upset force is provided by a solenoid operated plunger wherein the current provided to the coil of the solenoid is controlled such as by a servo-controller to achieve rivet upset time versatility whereby cracking may be minimized while maintaining high quality rivet upset uniformity. A condition such as plunger velocity or applied force during upset is sensed, and signals indicative of the condition are fed back to the servo-controller so that the condition may be instantaneously adjusted as the plunger is moved for rivet upset.

Low amperage electromagnetic apparatus and method for uniform rivet upset

This invention relates to a machine and its constituent components for drilling a hole in a workpiece, inserting a rivet in the hole, and upsetting the rivet, all without moving the lateral position of the machine or the workpiece, and to an assembly for supporting and positioning a plurality of said machines for working simultaneously on the workpiece.

Drill/rivet device

An apparatus utilizing electromagnetic energy for producing high impact forces by means of a ram propelled against a work piece. A specific utilization of the apparatus is in the installation of fasteners such as rivets in structural assemblies. The apparatus described herein is the work center of an electromagnetic impact tool and comprises the following components: electromagnetic high energy pulse coil, ram means, aerostatic bearing means and connector means.

Electromagnetic high energy impact apparatus

An apparatus for utilizing electromagnetic energy for producing high impact forces by means of a ram propelled against a work piece. The work center of the apparatus includes a ram assembly of bolted construction having a hollow ram shaft, which ram assembly includes a gap between opposing conductive surfaces including associated fastener screws of driving disc and ram shaft of at least about five-sixteenths of an inch. A solid mass recoil assembly provides integral housing and recoil mass, enabling aerostatic bearing functioning, and also lowers shock and vibration levels to operator and equipment.

Coil assembly for an electromagnetic high energy impact apparatus

A HIGH-IMPACT TOOL IS DISCLOSED AS PART OF A RAM COMPONENT OF AN ELECTRO-MECHANICAL GUN, AS SHOWN IN FIG. 1, WHICH CONVERTS A RAPIDLY CHANGING ELECTRIC CURRENT PASSING THROUGH ITS COIL INTO A MECHANICAL FORCE ACTING BETWEEN A CONDUCTOR PLATE ON THE RAM AND THE COIL TO PROPEL THE RAM AND ITS FORMING SURFACE AGAINST A WORKPIECE TO FORM IT. A PAIR OF PORTABLE ELECTRO-MECHANICAL RIVERTING FUNS, AS SHOWN IN FIGS. 3-7, IS DESCRIBED ALONG WITH AN ELECTRICAL SYSTEM, SHOWN IN FIG. 8, WHICH INTERLOCKS THEIR OPERATION TO INSURE A SIMULTANEOUS RAM IMPACT ON EACH END OF THE RIVET. THE POWER SUPPLY, FOR OPERATOR SAFETY, IS ISOLATED FROM GROUND AS IT DISCHARGES THROUGH THE COILS. A SYSTEM, SHOWN IN FIGS. 5-7, FOR PROPER GUN ALIGNMENT IS DISCLOSED WHEREIN INCREASED BACK-PRESSURE OF FLUID OR GAS OUTLETS, BLOCKED BY PROPER GUN POSITIONING AGAINST THE WORKPIECE, OPERATES CONTROL SWITCHES PERMITTING FIRING OF THE GUNS.

Jagdish S Sekhon

Papers

High-impact portable riveting apparatus