|Publication number||US2976907 A|
|Publication date||Mar 28, 1961|
|Filing date||Aug 28, 1958|
|Priority date||Aug 28, 1958|
|Publication number||US 2976907 A, US 2976907A, US-A-2976907, US2976907 A, US2976907A|
|Inventors||George W Harvey, David F Brower|
|Original Assignee||Gen Dynamics Corp|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (6), Referenced by (165), Classifications (17)|
|External Links: USPTO, USPTO Assignment, Espacenet|
March 28, 1961 G. w. HARVEY ET AL 2,976,907
METAL FORMING DEVICE AND METHOD Filed Aug. 28, 1958 2 Sheets-Sheet 1 J M QMILKLKW March 28, 1961 w, HARVEY ETAL 2,976,907
METAL FORMING DEVICE AND METHOD 2 Sheets-Sheet 2 Filed Aug. 28, 1958 United States Patent METAL FORMING DEVICE AND METHOD George W. Harvey, La Jolla, and David F. Brower, Del Mar, Califi, assignors to General Dynamics Corporatron, New York, N.Y., a corporation of Delaware Filed Aug. 28, 1958, Ser. No. 757,867
11 Claims. 01. 153-40 The present invention relates generally to metal forming devices and methods and more particularly to a device in which metal may be formed by the energy acquired from a varying magnetic field and a method of forming with such energy.
A metal work piece can be formed into a desired shape by performing work on the metal, i.e.-,- by transferring sufiicient energy to' the metal so as tdshape the metal into the desired for'rn. Heretofore, metal work pieces have been shaped while cold either by applying a" relatively continuously increasing mechanical force to the metal being worked or by applying a series of mechanical impulses to the metal such as by swaging.
An object of the present invention is to provide a method and a device for forming metal in which the energy necessary for forming the metal work piece to a desired shape is acquired from a varying magnetic field. A further object of the present invention is to provide a metal forming device in which the metal work piece is formed in a desired manner by one or more force impulses set up by a varying magnetic field. Still another object of the present invention is to provide a metal forming device which is economical to manufacture, and rugged, durable and eflicient in operation.
Additional objects and advantages of the present invention will become apparent from the following description and appended claims.
. In the drawings:
Figural is a schematic perspective view of one embodiment of a metal forming device constructed in accordance with the present invention, this device being adapted to reduce the diameter of a tubular work piece;
Figure 2 is a reduced sectional view of the work piece shown in Figure 1 after the operation of the metal forming device of Figure l;
Figure 3 is a schematic perspective view of another embodiment of a metal forming device constructed in accordance with the present invention, this device being adapted to join together a pair of telescoping tubular members;
Figure 4 is a reduced sectional view of the interengaged tubular members shown in Figure 3 after the operation of the metal forming device of Figure 3;
Figure 5 is a schematic perspective view of another embodiment of a metal forming device which is adapted for forming a plurality of spaced circumferential crimps in a tubular work piece;
Figure 6 is a reduced sectional view of the work piece shown in Figure 5 after the operation of the metal forming device of Figure 5;
Figure 7 is a schematic perspective view, partially in section, of another metal forming device constructed in accordance with the present invention, which is adapted to form a design or pattern on a flat work piece;
Figure 8 is a reduced perspective view showing the surface of the work piece shown in Figure 7 after the operation of the metal forming device of Figure 7;
Figure 9 is a schematic perspective view, partially in section, of still another metal forming device constructed in accordance with the present invention, which is adapted for forming a tubular work piece into a specific hape in conformance with an outer mold; and
Figure 10 is a sectional view" of the tubular work piece shown in Figure 9 after operation of the metal forming device of Figure 9.
A metal forming device in accordance with the present invention includes a means for setting up a predetermined varying magnetic field, and a means for maintaining the metal to be formed within the magnetic field for a length of time such that suflicient energy is acquired by the metal to form the metal in the desired manner.
When a current carrying conductor is placed across a magnetic field, the conductor will be subjected to a pressure which will tend to move the conductor. The amount of pressure on the conductor is proportional to the product of the current through the conductor and the component of the magnetic field perpendicular to the current. This pressure acting" on the conductor over a certain distance is" equivalent to the energy density acquired by or the work performed per unit area on the conductor. If the current carrying conductor is held stationary in the magnetic field, the pressure acting on the conductor, if high enough, will cause the conductor to become deformed.
When a conductor is placed in a varying magnetic field, a current is induced in the conductor. The interaction between this current and the magnetic field will then subject the conductor to a force; If the conductor is constrained and if a sufiicient amount of energy is acquired by the conductor, the conductor will be deformed. The work performed on, or the energy acquired by the conductor depends upon the position of the con'- ductor relative to the magnetic field, the strength of the magnetic field, the current induced in the conductor, the mass of the conductor, internal forces within the conductor, and the frequency of variations in the magnetic field. Accordingly, a high instantaneous pressure may be applied to the conductor by utilizing a current pulse to set up the the magnetic field.
By shaping a conductor in a suitable form, and passing a current pulse therethrough', a magnetic field of a predetermined shape will be set up almost instantaneously (in the order of a microsecond). Metal positioned in the shaped magnetic field will be formed, if the necessary energy is transferred to metal, in a manner depending upon the shape of the magnetic field and the position of metal relative to the field. The duration of the pressure on the metal positioned in the magnetic field is dependent upon the duration of the pulse, and is limited by the allowable increase'in the temperature of the metal. Ordinarily, the pulse may be applied for a duration between approximately a microsecond and many microseconds. However, at very low ambient temperatures the pulse may be applied for a longer duration, ranging from microseconds to a minute or so. The desired form of the magnetic field will, of course, be determined by the shape of the work piece and the work which one wishes to'perform on the work piece. This Work may comprise shaping, welding, embossing, engraving, etc., and may be performed on the metal by means of a single magnetic impulse imparted to the metal or by means of a series of impulses, in the manner of swaging. Because of the instantaneous pressure on metal positioned in the magnetic field, the metal may be rapidly accelerated, and hence the metal may be moved at a high velocity. Such a magnetic field may be utilized in numerous applications (e.g., embossing a rapidly moving strip of material by instantaneously impelling the sheet against a die). The instantaneous pressure which can be applied by this method is very great and may be many times the elastic limit of the metal which is being formed, thereby causing the metal to flow after the termination of the impulse. I
The embodiments hereinafter described are particular n 3 applications of the principles of the invention to certain specific examples of metal forming.
The metal forming device shown in Figure 1 may be utilized in reducing the diameter of a portion of a tubular .work piece. In this device the varying magnetic field is set up by passing a current pulse through a coil or solenoid 11. While pulses can be provided in any desired manner, in the illustrated embodiment, one or more pulses are supplied by means of a pulsing network 12 which includes a high capacity condenser 13 in series with a switching means 14, such as an ignitron, thyratron, spark gap, etc. The condenser 13 may be charged by means of a suitable high-voltage supply 15 which is connected to the condenser through a switch means 16 and a current limiting resistor 17. A suitable cable, such as a coaxial cable 18, connects the pulsing network 12 to the solenoid 1.1.
A suitable tubular work piece 20 of a suitable conductive material, such as copper or aluminum, is fixedly positioned within the solenoid 11 by suitable means such as a pair of clamps 21 or the like. When a current pulse is applied to the solenoid 11 a varying magnetic field is set up which induces an electromotive force in the work piece 20 which, in turn, causes a high-current to flow around the work piece. If the energy transferred to the metal work piece 20 by the interaction of the induced current and the magnetic field is suflicient, the tubular wall of the portion of the work piece within the solenoid .11 will be forced inwardly into the general form shown in Figure 2. If desired, a suitable die (not shown) may be inserted into the work piece to define or limit the deformation of the work piece. Because of the high acceleration that can be developed in the work piece by this method, a die in the ordinary sense may not be necessary. In certain cases the die need not have great strength; instead, it may depend upon its mass alone to decelerate the work piece.
The amount of energy transferred to a certain work piece for a given solenoid can be increased by increasing the voltage applied to the condenser, increasing the capacity of the condenser, or increasing the number of pulses applied to the work piece.
In one embodiment of the above described metal working device the solenoid was constructed with turns of insulated copper wire having a cross sectional area of 1 square centimeter and had an internal diameter of 4 centimeters, an outer diameter of 6 centimeters, and a length of 12 centimeters. The source of current pulses was a 30 microfarad capacitor which was charged to 10 kilovolts. This device was used to deform copper tubing having an outer diameter of 3.5 centimeters and a wall thickness of approximately 1.5 millimeters.
A metal forming device which may be utilized for joining together a pair of telescoping tubes by suitably crimping the lapping portions of the tubes is illustrated in Figure 3. In this embodiment, a bar of conductive material is formed into a loop 22 and a current pulse is fed to the loop 22 through a coaxial cable 18a by means of a pulsing network 12a, similar to the one previously described in connection with the solenoid type metal forming device.
The interengaged portions of a pair of telescoping tubes 23 may be suitably positioned within the loop 22 by a pair of clamps 24 or the like. When a current pulse is passed through the loop 22 a concentrated magnetic field is set up which is capable of transferring sufiicient energy to crimp the tubes 23 as shown in Figure 4.
While in Figure 3 the loop type metal forming device is used to join a pair of telescoping tubes 23, it also can be used to join a tubular tube to a rod or be used in a swaging operation in which the loop and work piece are moved relative to each other, while passing a series of current pulses through the loop.
The efiect of the concentrated magnetic field set up by the loop type metal forming device on a tube is unique in that the length of the tube as a whole remains relatively constant and the wall thickness is increased as the diameter is decreased. This is accomplished without the necessity of utilizing a rigid and strong support. In mechanical swaging a similar efiect can only be obtained by utilizing heavy dies and forming equipment. Thus progressive swaging of a tube by the disclosed metal forming device results in an increased wall thickness with little change in length.
In one embodiment of the loop type metal forming device a A inch copper bar was formed into a loop with a /8 inch inside diameter. The pulsing network included two 30 microfarad capacitors connected in parallel which were charged to 10 kilovolts.
A plurality of spaced circumferentially extending crimps can be formed in a tubular work piece, as shown in Figure 6, by the embodiment of the metal forming device shown in Figure 5. In this arrangement a plurality of loops 25, similar to the loop 22 described above, are disposed sequentially along a'tubular work piece 26 of conductive material. These loops 25 are connected in parallel and the parallel arrangement is connected through a coaxial cable 18b to a source of current pulses such as a pulsing network 12b which may be similar to the pulsing network 12.
A further embodiment of a metal working device in accordance with the present invention is illustrated in Figure 7. This device is adapted for impressing a pattern into the surface of a flat sheet of conductive material. In this arrangement, a conductor is wound in the form of a flat spiral 27. The spiral 27 is connected through a coaxial cable 18c to a pulsing network 12c. A suitable die 28 is disposed in adjacent overlying relation to the spiral 27. Suitable means, such as a stand 29 having an adjustable upper head 30 and a raised platform 31, is provided to maintain the die 28 and the spiral 27 in a spaced-apart relationship.
A work piece 32, which is a relatively thin, flat sheet of conductive material, such as copper or aluminum, is arranged between the die 28 and the spiral 27. When a pulse is passed through the spiral 27 a varying magnetic field is set up, which induces an electromotive force in the work piece 32 causing local currents to flow therein. This sets up a force which forces the work piece 32 against the die 28, conforming it to the surface of the die, thus producing a pattern on the surface of the work piece. If desired, the metal working device may be operated in a vacuum to increase the efficiency of the forming of the metal. I
The spiral type metal working device may be used to strengthen metal by forming'ridges in the metal such as shown in Figure 8, to produce decorative designs in metal, to surface weld a metal sheet to a non-metallic sheet, etc.
In one embodiment of the spiral type metal forming device, a flat spiral was formed with approximately 14 turns of number 11 insulated copper wire. The spiral had an outer diameter of 5.5 centimeters. The current pulses for the spiral were provided by a 15 microfarad capacitor which was charged to 10 kilovolts. In one application of this spiral type metal forming device a .005 inch sheet of copper was conformed to a suitable pattern on the surface of a polyethylene die.
A still further embodiment of a metal forming device in accordance with the present invention is illustrated in Figure 9. This device is adapted for expanding a tubular work piece against a surrounding die. In this arrangement a conductor 33, which is generally semicylindrical in cross section with the edges rounded, is bent backwardly upon itself with the fiat pontions of the adjacent sections of the conductor facing each other. The conductor 33 is connected through a coaxial cable 18d to a pulsing network 12d. A suitable split tubular die 34, which is releasably locked together, is disposed in concentric relationship to the conductor 33.
A tubular work piece 35 is arranged between the conductor 33 and the die 34. When a current pulse is passed through the conductor 33 a generally circular circumferential field is set up along the length of the conductor. This sets up a force which expands the work piece 35 against the inner surface of the surrounding die 34, thus conforming the work piece to the pattern on the inner surface of the die, as shown in Figure 10.
In a practical embodiment of the metal forming device a generally semi-cylindrical conductor having a diameter of 2.5 centimeters, a gap of 2 millimeters between the flat surfaces, and a length of 15 centimeters, was utilized to set up the magnetic field. The source of current pulses was a 60 microfarad capacitor which was charged to kilovolts. The die had an internal diameter which just cleared the work piece having a diameter of 2.75 centimeters and a wall thickness of 0.5 millimeter.
From the above, it should be obvious that the principle of using a varying magnetic field to supply energy to form metallic objects can be applied to others forms of metal forming devices than those previously described.
Various of the novel features of the present invention are set forth in the following claims.
1. A magnetic metal forming device comprising a conductor shaped to provide a predetermined magnetic field, means for applying at least one predetermined current pulse through said conductor, a die located adjacent said conductor, and means for positioning a metallic work piece between said conductor and said die, said current pulse being of such strength and being effective for a sufiicient length of time to transfer the necessary energy to the metallic work piece to cause it to conform to the surface of said die.
2. A magnetic metal forming device comprising a conductor wound in the shape of a fiat spiral, means for applying at least one predetermined current pulse through said conductor, a die located adjacent and generally parallel to the surface of said spiral, and means for maintaining the spaced relationship between said conductor and said die, said current pulse being of such strength and being effective for a sufiicient length of time to transfer the necessary energy to a sheet of metal positioned between said die and said conductor to cause it to conform to the surface of said die.
3. A magnetic metal forming device comprising a conductor bent back upon itself in hairpin fashion, means for applying at least one predetermined current pulse through the conductor, a tubular die surrounding at least a portion of said hairpin shaped conductor, said current pulse being of such strength and being effective for a sufiicient length of time-to transfer the necessary energy to a tubular metal work piece positioned over the conductor and within the die to cause it to conform to the surface of the die.
4. A method of forming metal comprising setting up a predetermined varying magnetic field, and maintaining a metal work piece within the magnetic field so that suflieient energy is transferred from the magnetic field to certain portions of the metal to form the metal in the desired manner.
5. A method of forming metal comprising applying a varying current through a conductor shaped to provide a predetermined magnetic field, and maintaining a metal work piece at a predetermined position within the magnetic field so that sufficient energy is transferred from the magnetic field to certain portions of the metal to form the metal in the desired manner.
6. A method of forming metal comprising applying at least one current pulse of a predetermined amplitude and duration through a conductor shaped to provide a magnetic field of a predetermined shape, and maintaining a metal work piece at a predetermined position relative to the conductor so that the changing magnetic field will act in the desired manner on the work piece, the magnetic field at the work piece being of such strength and shape and being effective for a length of time sufficient to transfer the necessary energy to certain portions of the metal to form the metal in the desired manner.
7. A magnetic metal forming device comprising a conductor shaped to provide a magnetic field of a predetermined shape, an energy storage means, switch means conneoting said conductor to said energy storage means, and means for maintaining a metal work piece to be formed at a predetermined position within the magnetic field produced by said conductor when said switch means is closed, the energy in said energy storage means being such that the produced magnetic field is of sufiicient amplitude and effective for a length of time sufficient to transfer the necessary energy to certain portions of the metal work piece to form the metal work piece in the desired manner.
8. A magnetic metal forming device comprising a conductor shaped to provide a magnetic field of a predetermined shape, a capacitor, switch means connecting said conductor to said capacitor, means connected to said capacitor for storing electrical energy in said capacitor, and means for maintaining the metal work piece to be formed at a predetermined position in the magnetic field produced by said conductor when said switch means is closed, the energy stored in said capacitor being such that the produced magnetic field is of sufficient amplitude and effective for a length of time sufficient to transfer the necessary energy to certain portions of the metal work piece to form the metal work piece in the desired manner.
9. A magnetic metal forming device comprising a solenoid, energy storage means, switch means connecting said solenoid to said energy storage means, and means for positioning at least a part of an elongated metallic work piece within said solenoid, the energy in said energy storage means being such that the magnetic field produced by said solenoid when said switch means is closed is of sufficient amplitude and effective for a length of time sufficient to transfer the necessary energy to the metal work piece within the solenoid to alter its cross sectional area.
10. A magnetic metal forming device comprising at least one conductor shaped so as to form at least one loop, an energy storage means, switch means connecting said loop to said energy storage means, and means for positioning at least a portion of a metallic work piece to be formed within said loop-shaped conductor, the energy in said energy storage means being such that the magnetic field produced by said loop-shaped conductor when said switch means is closed is of suificient amplitude and effective for a length of time sufficient to transfer the necessary kinetic energy to the metal work piece within said loop-shaped conductor to alter its cross sectional area.
11. A magnetic metal forming device comprising a low resistance, rigid solenoid, a high voltage source capable of passing a high current through said solenoid, switch means connecting said solenoid to said high voltage source, and means for fixedly positioning at least a part of an elongated tubular metallic work piece within said solenoid, said source of high voltage being such that the current through said solenoid when said switch means is closed produces a magnetic field which is of suflicient amplitude and elfective for a length of time suflicient to transfer the necessary energy to the metal work piece within the solenoid to alter its cross sectional area.
References Cited in the file of this patent UNITED STATES PATENTS 1,365,198 Sessions Ian. 11, 1921 2,367,206 Davis Jan. 16, 1945 2,372,516 Rechton Mar. 27, 1945 2,397,717 Westin Apr. 2, 1946 2,441,517 Sussman May 11, 1948 2,686,865 Kelly Aug. 17, 1954
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US1365198 *||Mar 24, 1919||Jan 11, 1921||Frank L Sessions||Method of and apparatus for electrically welding tubing|
|US2367206 *||Mar 11, 1942||Jan 16, 1945||Du Pont||Method of joining objects|
|US2372516 *||Sep 7, 1942||Mar 27, 1945||Douglas Aircraft Co Inc||Machine for forming material|
|US2397717 *||Jul 3, 1944||Apr 2, 1946||Smith Corp A O||Method and apparatus for electrically heating and forming metal bodies|
|US2441517 *||Mar 16, 1946||May 11, 1948||Julius L Sussman||Means for shaping metal articles|
|US2686865 *||Oct 20, 1951||Aug 17, 1954||Westinghouse Electric Corp||Stabilizing molten material during magnetic levitation and heating thereof|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US3088200 *||Nov 10, 1960||May 7, 1963||Dale H Birdsall||Magnetic shaping process|
|US3092165 *||Jan 11, 1961||Jun 4, 1963||Gen Dynamics Corp||Magnetic forming method and apparatus therefor|
|US3096158 *||Sep 25, 1959||Jul 2, 1963||Gaule Gerthart K||Apparatus for pulling single crystals in the form of long flat strips from a melt|
|US3108325 *||Jan 13, 1961||Oct 29, 1963||Gen Dynamics Corp||Forming device|
|US3114585 *||Feb 6, 1962||Dec 17, 1963||Gen Dynamics Corp||Forming apparatus|
|US3115857 *||Jun 5, 1961||Dec 31, 1963||Republic Aviat Corp||Metal forming apparatus|
|US3126937 *||Feb 15, 1962||Mar 31, 1964||Gen Dynamics Corp||Forming method and apparatus therefor|
|US3167043 *||Apr 11, 1962||Jan 26, 1965||Advanced Kinetics Inc||Metal forming devices and method using magnetic and hydraulic pressure|
|US3171014 *||Sep 5, 1962||Feb 23, 1965||Giannini Scient Corp||Method of effecting magnetic deformation of a workpiece|
|US3175383 *||Jan 16, 1963||Mar 30, 1965||Alfred B Levine||Magnetic processes|
|US3187532 *||Dec 26, 1961||Jun 8, 1965||Advancel Kinetics Inc||Metal-forming devices using direct electrode contact|
|US3196529 *||Sep 28, 1962||Jul 27, 1965||Robert J Schwinghamer||Apparatus for securing objects together|
|US3196649 *||Feb 16, 1962||Jul 27, 1965||Advanced Kinetics Inc||Devices for metal-forming by magnetic tension|
|US3203211 *||May 22, 1961||Aug 31, 1965||Mallinckrodt George E||Tubing fabrication|
|US3203212 *||Mar 1, 1963||Aug 31, 1965||Lockheed Aircraft Corp||Explosive forming by electrical discharge method and apparatus|
|US3208132 *||Apr 13, 1962||Sep 28, 1965||Escher William J D||Method of making a multi-walled chamber|
|US3210509 *||Jul 29, 1963||Oct 5, 1965||Aeg||Method of and apparatus for electromagnetically deforming metal|
|US3210842 *||Oct 21, 1964||Oct 12, 1965||Schwinghamer Robert J||Method of securing objects together by expanding the inner object|
|US3212311 *||Apr 16, 1963||Oct 19, 1965||Inoue Kiyoshi||Method and apparatus for electromagnetic shaping of metallic bodies|
|US3214511 *||Dec 23, 1963||Oct 26, 1965||Westinghouse Electric Corp||Casing and insulator bushing assembly|
|US3222771 *||Feb 16, 1965||Dec 14, 1965||Schwinghamer Robert J||Method of securing objects together by magnetic deformation|
|US3251974 *||Mar 28, 1963||May 17, 1966||Ohio Crankshaft Co||Metal forming apparatus|
|US3252313 *||Dec 21, 1964||May 24, 1966||Gen Motors Corp||Electromagnetic forming method and apparatus|
|US3253443 *||Mar 4, 1965||May 31, 1966||Gen Dynamics Corp||Forming device|
|US3256846 *||Apr 24, 1963||Jun 21, 1966||Continental Can Co||Magnetic impulse can flanging and separating apparatus and method|
|US3258573 *||Jun 13, 1963||Jun 28, 1966||Morin Theodore J||Welding and forming method and apparatus|
|US3279228 *||Mar 11, 1964||Oct 18, 1966||Gen Dynamics Corp||Forming device and method|
|US3288006 *||Aug 14, 1963||Nov 29, 1966||Continental Can Co||Magnetic impulse scoring and/or cutoff of electrically conductive sections|
|US3303560 *||Oct 23, 1965||Feb 14, 1967||Parker Hannifin Corp||Method of making containers for fluids under pressure|
|US3313906 *||Oct 14, 1964||Apr 11, 1967||Continental Can Co||Welding method|
|US3314260 *||Jul 1, 1964||Apr 18, 1967||Calumet & Hecla||Method and apparatus for producing finned metal tubing|
|US3318127 *||Aug 24, 1964||May 9, 1967||Westinghouse Electric Corp||Forming apparatus|
|US3321946 *||Dec 16, 1964||May 30, 1967||Gen Motors Corp||Electromagnetic forming apparatus having improved backing member of high strength and electrical resistance|
|US3323202 *||May 19, 1964||Jun 6, 1967||Gen Dynamics Corp||Magnetic apparatus and method for dislodging an object|
|US3333327 *||Nov 30, 1964||Aug 1, 1967||Gen Electric||Method of introducing electrical conductors into conductor accommodating structure|
|US3333328 *||Nov 30, 1964||Aug 1, 1967||Gen Electric||Methods for changing relative positions of movable conductors for use in electrical inductive devices|
|US3333329 *||Nov 30, 1964||Aug 1, 1967||Gen Electric||Method for placing one or more electrical coils in desired spacial relationship with respect to a coil-accommodating member|
|US3333330 *||Nov 30, 1964||Aug 1, 1967||Gen Electric||Methods for effecting coil-pacing operations on electrical coils in coil-accommodating members|
|US3333335 *||Nov 30, 1964||Aug 1, 1967||Gen Electric||Method for altering the overall configuration of electrical coils wound from a number of conductor turns|
|US3345732 *||Jun 11, 1964||Oct 10, 1967||Gen Dynamics Corp||Method of shrink fitting and apparatus therefor|
|US3349567 *||Jun 3, 1964||Oct 31, 1967||Munn John E||Mine roof support and method of providing same|
|US3353251 *||Dec 23, 1966||Nov 21, 1967||Gen Electric||Apparatus for effecting conductorplacing operations on electrical coils in inductivedevices|
|US3360972 *||May 4, 1965||Jan 2, 1968||Nasa Usa||Magnetomotive metal working device|
|US3365923 *||Sep 15, 1965||Jan 30, 1968||Siemens Ag||Device for producing a uniform pressure for the deep-drawing of metal workpieces|
|US3372467 *||Apr 19, 1965||Mar 12, 1968||Simplex Wire & Cable Co||Method and apparatus for plasma welding and magnetically corrugating metal tubing|
|US3372564 *||Apr 19, 1965||Mar 12, 1968||Simplex Wire & Cable Co||Method for shaping metal tubes|
|US3383888 *||Dec 17, 1963||May 21, 1968||Continental Can Co||Magnetic cutoff guiding and positioning of tubing|
|US3386276 *||Jun 3, 1964||Jun 4, 1968||Atomic Energy Commission Usa||Device for forming small diameter tubing|
|US3412452 *||Dec 23, 1966||Nov 26, 1968||Gen Electric||Arrangements for altering the overall configuration of electrical coils wound from anumber of conductor turns|
|US3412453 *||Dec 23, 1966||Nov 26, 1968||Gen Electric||Apparatus for introducing electrical conductors into conductor accommodating structure|
|US3429159 *||Jun 27, 1967||Feb 25, 1969||Gulf General Atomic Inc||Forming apparatus|
|US3430472 *||Aug 25, 1967||Mar 4, 1969||Advanced Kinetics Inc||Magnetic device for forming sheet metal|
|US3431625 *||Nov 10, 1965||Mar 11, 1969||Siemens Ag||Method for the precise assembly of apparatus|
|US3432010 *||Jun 19, 1967||Mar 11, 1969||Girling Ltd||Seals for hydraulic apparatus|
|US3438115 *||Nov 30, 1967||Apr 15, 1969||Union Carbide Corp||Method of making vacuum containers|
|US3439403 *||Jun 20, 1966||Apr 22, 1969||Siemens Ag||Magnetoform method assembly device|
|US3447350 *||Feb 5, 1968||Jun 3, 1969||Siemens Ag||Method and device for the magnetic forming of metallic workpieces|
|US3461528 *||Sep 14, 1966||Aug 19, 1969||Siemens Ag||Method of producing a rotary joint between at least two members having a rotationally symmetrical construction at the joint|
|US3501828 *||Aug 5, 1968||Mar 24, 1970||Gen Motors Corp||Method of manufacturing a tie rod assembly|
|US3507034 *||May 8, 1967||Apr 21, 1970||Nasa||Method and apparatus for precision sizing and joining of large diameter tubes|
|US3507039 *||Dec 12, 1967||Apr 21, 1970||Trw Inc||Method of making a miniature inductive device|
|US3513531 *||Jun 24, 1968||May 26, 1970||Union Carbide Corp||Method of making vacuum containers|
|US3541824 *||Aug 20, 1969||Nov 24, 1970||Frenkel Marvin A||Magnetic forming methods and apparatus|
|US3581040 *||Jun 11, 1969||May 25, 1971||Inland Steel Co||Forming of thin metal filaments|
|US3590460 *||Oct 6, 1969||Jul 6, 1971||Us Gov The||Apparatus for assembling flanges to waveguides|
|US3590464 *||Mar 7, 1969||Jul 6, 1971||Gulf Energy & Environ Systems||Threaded fastener and method of making the same|
|US3631698 *||Dec 29, 1969||Jan 4, 1972||Aeg Elotherm Gmbh||Method and apparatus for hot straightening elongated metal workpieces|
|US3777783 *||Oct 6, 1971||Dec 11, 1973||Kunkle Valve Co Inc||Valve and method of making the same|
|US3805569 *||Apr 10, 1972||Apr 23, 1974||Chartet A||Apparatus for the connection by setting of collectors on water-boxes of heat exchangers|
|US3851139 *||Dec 6, 1973||Nov 26, 1974||Thermatool Corp||Magnetic pulse welding using spaced proximity conductor|
|US3879247 *||Apr 2, 1973||Apr 22, 1975||Harrington Research Corp||Method of heat sealing and holding package closure elements|
|US4285224 *||Jan 25, 1979||Aug 25, 1981||Shkatov Alexandr S||Electric pulse tube expander|
|US4404483 *||Feb 26, 1981||Sep 13, 1983||Taco, Inc.||Method of fabricating a wet-rotor circulator and circulator produced thereby|
|US4469356 *||Aug 24, 1982||Sep 4, 1984||Societe Nationale Industrielle Aerospatial||Connecting device and method|
|US4504714 *||Nov 2, 1981||Mar 12, 1985||Jack Katzenstein||System and method for impact welding by magnetic propulsion|
|US4513188 *||Oct 20, 1981||Apr 23, 1985||Jack Katzenstein||System and method for impact welding by magnetic implosion|
|US4513488 *||Feb 8, 1982||Apr 30, 1985||Grumman Aerospace Corporation||Method of fabricating a torque joint|
|US4561799 *||Sep 11, 1984||Dec 31, 1985||Grumman Aerospace Corp.||Torque joint|
|US4825625 *||Dec 17, 1986||May 2, 1989||International Paper Company||Sealing method and apparatus for high capacity aseptic form, fill, and seal machines|
|US4862043 *||May 27, 1987||Aug 29, 1989||Zieve Peter B||Low voltage electromagnetic pulse actuator|
|US4865635 *||Aug 17, 1988||Sep 12, 1989||Talley Automotive Products, Inc.||Filter assembly for non-welded inflator device|
|US4877264 *||Dec 27, 1988||Oct 31, 1989||Talley Automotive Products, Inc.||Aspirating/venting air bag module assembly|
|US4913461 *||Dec 27, 1988||Apr 3, 1990||Talley Automotive Products, Inc.||Airbag module and method of making same|
|US4923212 *||Aug 17, 1988||May 8, 1990||Talley Automotive Products, Inc.||Lightweight non-welded inflator unit for automobile airbags|
|US5205459 *||Sep 1, 1992||Apr 27, 1993||Ethicon, Inc.||Surgical anastomosis stapling instrument|
|US5231747 *||Dec 21, 1990||Aug 3, 1993||The Boeing Company||Drill/rivet device|
|US5263236 *||Jan 10, 1992||Nov 23, 1993||The Boeing Company||Drill quill bearing assembly|
|US5275322 *||Jan 28, 1993||Jan 4, 1994||Ethicon, Inc.||Surgical anastomosis stapling instrument|
|US5286054 *||Jan 27, 1992||Feb 15, 1994||Talley Automotive Products, Inc.||Aspirating/venting motor vehicle passenger airbag module|
|US5331832 *||Aug 23, 1993||Jul 26, 1994||Xerox Corporation||Sleeve sizing processes|
|US5333773 *||Nov 16, 1992||Aug 2, 1994||Ethicon, Inc.||Sealing means for endoscopic surgical anastomosis stapling instrument|
|US5350104 *||Jan 12, 1994||Sep 27, 1994||Ethicon, Inc.||Sealing means for endoscopic surgical anastomosis stapling instrument|
|US5390732 *||Feb 14, 1994||Feb 21, 1995||Chrysler Corporation||Clamping apparatus and method for heat exchanger plates|
|US5398537 *||Dec 6, 1991||Mar 21, 1995||Gemcor Engineering Corporation||Low amperage electromagnetic apparatus and method for uniform rivet upset|
|US5404633 *||Jan 10, 1992||Apr 11, 1995||The Boeing Company||Method of dynamically supporting a drill quill in a drill/rivet machine|
|US5405574 *||Feb 10, 1992||Apr 11, 1995||Iap Research, Inc.||Method for compaction of powder-like materials|
|US5444963 *||Mar 10, 1994||Aug 29, 1995||Magnet-Physik Dr. Steingroever Gmbh||Process and equipment for shaping container seals|
|US5454154 *||Apr 7, 1993||Oct 3, 1995||Xerox Corporation||Photoreceptor stripping methods|
|US5572782 *||Dec 1, 1993||Nov 12, 1996||Xerox Corporation||Flexible belt assembly|
|US5577315 *||Jun 6, 1995||Nov 26, 1996||The Boeing Company||Method of upsetting rivets|
|US5611139 *||Apr 6, 1995||Mar 18, 1997||Iap Research, Inc.||Structure and method for compaction of powder-like materials|
|US5611230 *||Jan 3, 1995||Mar 18, 1997||Iap Research, Inc.||Structure and method for compaction of powder-like materials|
|US5621963 *||Jun 6, 1995||Apr 22, 1997||The Boeing Company||Differential capacitance in an electromagnetic riveter|
|US5634364 *||Dec 4, 1995||Jun 3, 1997||Reynolds Metals Company||Segmented coil for use in electromagnetic can forming|
|US5671522 *||Jan 29, 1996||Sep 30, 1997||Northrop Grumman Corporation||Method and apparatus for sealing a pressure vessel|
|US5685058 *||Jun 6, 1995||Nov 11, 1997||The Boeing Company||Method for direct insertion of a headed rivet into a countersunk hole|
|US5687599 *||Jan 4, 1996||Nov 18, 1997||Reynolds Metals Company||Method of forming a can with an electromagnetically formed contoured sidewall and necked end|
|US5689797 *||Apr 6, 1995||Nov 18, 1997||Iap Research, Inc.||Structure and method for compaction of powder-like materials|
|US5692853 *||Nov 27, 1995||Dec 2, 1997||Curtiss Wright Flight Systems Inc.||Threaded joint construction and rod assembly incorporating same|
|US5730016 *||Mar 22, 1996||Mar 24, 1998||Elmag, Inc.||Method and apparatus for electromagnetic forming of thin walled metal|
|US5735047 *||Oct 15, 1996||Apr 7, 1998||Aeroquip Corporation||Ball valve assembly and method for forming|
|US5752306 *||Jun 6, 1995||May 19, 1998||The Boeing Company||Method for upsetting a headed rivet by differential initiation of opposed electromagnetic rivet drivers|
|US5826320 *||Jan 8, 1997||Oct 27, 1998||Northrop Grumman Corporation||Electromagnetically forming a tubular workpiece|
|US5855053 *||Jun 18, 1996||Jan 5, 1999||Northrop Grumman Corporation||Method and forming die for fabricating spiral groove torque tube assemblies|
|US5857663 *||Dec 10, 1997||Jan 12, 1999||Aeroquip Corporation||Ball valve assembly and method for forming|
|US5894663 *||Dec 10, 1997||Apr 20, 1999||Aeroquip Corporation||Method for forming a ball value assembly|
|US6137094 *||Aug 27, 1999||Oct 24, 2000||Kistersky; Ludmila||External inductor for magnetic-pulse welding and forming|
|US6273963||Jul 29, 1996||Aug 14, 2001||Iap Research, Inc.||Structure and method for compaction of powder-like materials|
|US6375381||Jan 6, 2000||Apr 23, 2002||Curtiss Wright Flight Systems, Inc.||Machine element/assembly and magneform joint|
|US6432554||Feb 15, 2000||Aug 13, 2002||Iap Research, Inc.||Apparatus and method for making an electrical component|
|US6524526||Aug 1, 2001||Feb 25, 2003||Iap Research, Inc.||Structure and method for compaction of powder-like materials|
|US6751994||May 28, 2002||Jun 22, 2004||Magna International Inc.||Method and apparatus for forming a structural member|
|US6811887||Aug 12, 2002||Nov 2, 2004||Iap Research, Inc.||Apparatus and method for making an electrical component|
|US6830173||Aug 24, 2001||Dec 14, 2004||Senco Products, Inc.||Impact device|
|US6868778||Sep 14, 2001||Mar 22, 2005||Iap Research, Inc.||System and method for loading a plurality of powder materials in an electromagnetic compaction press|
|US6968718 *||Jul 8, 2003||Nov 29, 2005||Kabushiki Kaisha Kobe Seiko Sho Kobe Steel, Ltd.||Method for electromagnetically forming metallic member and metallic member formed by electromagnetic forming|
|US7361301||Sep 2, 2003||Apr 22, 2008||Iap Research, Inc.||System and method for consolidating powders|
|US7362015||Sep 13, 2004||Apr 22, 2008||Iap Research, Inc.||Apparatus and method for making an electrical component|
|US7455509||Jan 27, 2005||Nov 25, 2008||Iap Research, Inc.||System and method for loading a plurality of powder materials in a compaction press|
|US7487655 *||Sep 26, 2003||Feb 10, 2009||Kobe Steel, Ltd||Process for producing tubular ring with beads and die for use therein|
|US7513025||Dec 28, 2004||Apr 7, 2009||The Boeing Company||Magnetic field concentrator for electromagnetic forming|
|US7847223||Oct 30, 2007||Dec 7, 2010||The Boeing Company||Electromagnetic pulse welding of fluid joints|
|US7954221||May 21, 2008||Jun 7, 2011||The Boeing Company||Electromagnetic mechanical pulse forming of fluid joints for high-pressure applications|
|US8350176 *||Jun 6, 2008||Jan 8, 2013||Babcock & Wilcox Power Generation Group, Inc.||Method of forming, inserting and permanently bonding ribs in boiler tubes|
|US20020131572 *||Oct 24, 2001||Sep 19, 2002||Paradis Peter R.||Method and apparatus for scheduling appointments|
|US20030183670 *||Aug 24, 2001||Oct 2, 2003||Barber John P.||Impact device|
|US20040007038 *||Jul 8, 2003||Jan 15, 2004||Kabushiki Kaisha Koba Seiko Sho(Kobe Steel, Ltd.)||Method for electromagnetically forming metallic member and metallic member formed by electromagnetic forming|
|US20040042924 *||Sep 2, 2003||Mar 4, 2004||Iap Research, Inc.||System and method for consolidating powders|
|US20050030141 *||Sep 13, 2004||Feb 10, 2005||Iap Research, Inc.||Apparatus and method for making an electrical component|
|US20050201885 *||Jan 27, 2005||Sep 15, 2005||Iap Research, Inc.||System and method for loading a plurality of powder materials in a compaction press|
|US20060107715 *||Sep 26, 2003||May 25, 2006||Kabushiki Kaisha Kobe Seiko Sho||Process for producing tubular ring with beads and die for use therein|
|US20060131877 *||Dec 21, 2004||Jun 22, 2006||The Boeing Company||Electromagnetic mechanical pulse forming of fluid joints for high-pressure applications|
|US20060138769 *||Dec 28, 2004||Jun 29, 2006||The Boeing Company||Magnetic field concentrator for electromagnetic forming and magnetic pulse welding of fluid joints|
|US20060145474 *||Jan 3, 2005||Jul 6, 2006||Allen Fischer||Electromagnetic mechanical pulse forming of fluid joints for low-pressure applications|
|US20060208481 *||Dec 22, 2004||Sep 21, 2006||The Boeing Company||Electromagnetic pulse welding of fluid joints|
|US20080036204 *||Oct 30, 2007||Feb 14, 2008||Allen Fischer||Electromagnetic pulse welding of fluid joints|
|US20080250758 *||Sep 12, 2006||Oct 16, 2008||Johannes Rauschnabel||Apparatus for Closing Containers|
|US20090301159 *||Jun 6, 2008||Dec 10, 2009||Mohn Walter R||Method of forming, inserting and permanently bonding ribs in boiler tubes|
|US20130002011 *||Jun 30, 2011||Jan 3, 2013||Robert Lee Meyer||Track pin retention system|
|USRE33467 *||Jan 23, 1989||Dec 4, 1990||International Paper Company||Induction sealing of paperboard|
|USRE33938 *||Oct 19, 1990||May 26, 1992||Talley Automotive Products, Inc.||Aspirating/venting air bag module assembly|
|DE1167465B *||Feb 11, 1963||Apr 9, 1964||Gen Dynamics Corp||Verfahren und Einrichtung zum Formen von Werkstuecken|
|DE1279618B *||Feb 6, 1963||Oct 10, 1968||Gulf General Atomic Inc||Klemmvorrichtung an einer magnetischen Formeinrichtung|
|DE1579591B1 *||Nov 5, 1965||May 19, 1971||Union Carbide Corp||Doppelwandiger isolierender Behaelter und Verfahren zu seiner Herstellung|
|DE1602457B1 *||Nov 3, 1967||Feb 3, 1972||Gulf Oil Corp||Vorrichtung zur verformung eines werkstuecks mittels eines magnetfeldes|
|DE3238833A1 *||Oct 20, 1982||Jun 16, 1983||Katzenstein Jack||Anordnung und verfahren zum stossschweissen durch magnetischen antrieb|
|EP0536882A2 *||Aug 21, 1992||Apr 14, 1993||Ethicon Inc.||Surgical anastomosis stapling instrument|
|EP0948421A2 *||Jun 19, 1997||Oct 13, 1999||IAP Research, Inc.||Structure and method for compaction of powder-like materials|
|EP1079498A2 *||Aug 9, 2000||Feb 28, 2001||Bayerische Motoren Werke Aktiengesellschaft||Electric machine with a rotor and a stator|
|WO1995027576A1 *||Apr 10, 1995||Oct 19, 1995||Grumman Aerospace Corporation||Forming grooves in a tubular member|
|WO1997010907A1 *||Sep 18, 1996||Mar 27, 1997||The Boeing Company||Tube forming on an end fitting|
|WO1998030354A1 *||Dec 18, 1997||Jul 16, 1998||Northrop Grumman Corporation||Electromagnetically forming a tubular workpiece|
|WO2008028982A1||Sep 8, 2006||Mar 13, 2008||Fundacion Labein||Electromagnetic device and method for the geometric rectification of stamped metal parts|
|WO2011151730A2 *||Jun 3, 2011||Dec 8, 2011||Dieter Wolfgang Blum||Apparatus for emergency electrodynamic capping of pipes and wells|
|WO2011151730A3 *||Jun 3, 2011||Jan 26, 2012||Dieter Wolfgang Blum||Apparatus for emergency electrodynamic capping of pipes and wells|
|U.S. Classification||72/56, 29/516, 285/382.2, 72/372, 219/607, 264/DIG.580, 29/447, 425/DIG.260, 29/419.2, 425/DIG.330, 219/153|
|Cooperative Classification||Y10S425/033, Y10S425/026, Y10S264/58, B21D26/14|