초록 ▼

An improved electromagnetic induction method and apparatus therefor for simultaneously collapsing and propelling a deformable annular-shaped workpiece of relatively lightweight construction in a direction outwardly of the apparatus and along its axis wherein the apparatus is made up of seven differe

An improved electromagnetic induction method and apparatus therefor for simultaneously collapsing and propelling a deformable annular-shaped workpiece of relatively lightweight construction in a direction outwardly of the apparatus and along its axis wherein the apparatus is made up of seven different embodiments for carrying out the method. Each apparatus is generally comprised of a framework. The framework includes at least one pulse coil means; and a power supply circuit is connected to the pulse coil means. Annular-shaped surface portions of various embodiments of the apparatus define part of an aperture or passageway for receiving a workpiece and function to position the workpiece in mutual inductance relation to the coil means. The pulse coil means, when energized after positioning of a workpiece in an apparatus, causes the formation of a series of magnetic forces acting on the workpiece that causes progressive collapsing of the workpiece in a direction towards the axis of the apparatus so as to form a slug of solid-like construction and approximately cylindrical or spherical shape. At the same time, the positioned workpiece is accelerated and propelled at a relatively high velocity in a direction outwardly of the coil means and along the apparatus axis. The magnitude of the apex angle, as defined between surface or mandrel portions of an apparatus and the apparatus axis can be varied within limits and is relevant to the magnitudes of the magnetic force components that are generated by a coil means for collapsing, accelerating and propelling a workpiece.

대표청구항 ▼

An electromagnetic induction method for progressively collapsing an annular shaped deformable workpiece about its axis while at the same time simultaneously accelerating the progressively collapsed workpiece for propulsion therealong comprising the steps of: initially positioning and supporting a fr

An electromagnetic induction method for progressively collapsing an annular shaped deformable workpiece about its axis while at the same time simultaneously accelerating the progressively collapsed workpiece for propulsion therealong comprising the steps of: initially positioning and supporting a frusto-conical shaped deformable workpiece in concentric relation about an axis, the workpiece being of a suitable grade of electric conductive material and of relatively lightweight sheet-like construction, and generating a series of electromagnetic forces in pulse-like fashion and sufficient duration about the periphery of the workpiece, such that each force of the series of forces is directed toward the axis but in angular relation thereto, the radial force component of each one of the forces of the series thereof acting on the workpiece so as to progressively collapse the workpiece about its periphery in a radial direction from its initial position and support towards the axis in order to effect formation of the workpiece into an approximately cylindrically-shaped slug of reduced dimensions and solid-like construction while at the same time the axial force component of each one of the forces of the series thereof acting on the workpiece in a direction outwardly of its initial position and support and along the axis in order to cause acceleration and propulsion of the workpiece from its initial position and support to another position along the axis that is spaced outwardly of its initial position and support as the workpiece is also progressively collapsed to a slug of cylindrical shape and solid-like construction.