Low amperage electromagnetic apparatus and method for uniform ri

Metal deforming – With means to drive tool – Including magnet – solenoid or explosive

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72 19, 2924354, B21J 1524

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active

053985370

ABSTRACT:
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.

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