Abstract: An assembly to deform metal parts by magnetic pulse includes an induction coil having branches connected to a power supply. The branches extend adjacent to one another to define a slot. An active portion of the coil connected to the first and second branches, an active surface of the active portion being arranged opposite a part to be deformed. The assembly includes an integral mask cooperating in a detachable manner with all or a portion of the coil when the mask is in an operating position on the coil. The mask having a shape that is at least partially complementary to the shape of the coil such that when it is in the operating position, a first portion of the mask is inserted into the slot and a second portion of the mask covers the active surface of the coil. The mask being made of an electrically insulating material.

Abstract: A hybrid method for forming a material blank includes placing a material blank to be deformed between a die and a blank-holder. The material blank is deformed by stamping using at least one punch in order to obtain a pre-stamped material blank. A cavity, wherein, on one hand, the at least one punch having pre-stamped the material blank and, on the other, at least one pair of electrodes are located, is filled with liquid. The pre-stamped material blank is placed in contact with the liquid of the cavity, and at least one electrical discharge is generated between the at least one pair of electrodes in such a way as to deform the pre-stamped material blank against the die.

Abstract: A method for shaping a part using a magnetic pulse is provided. A thin conductive layer is positioned on the part. The part is positioned between a coil and a matrix, the conductive layer being arranged between the coil and the part. An induced current, generated by the coil, is configured: to vaporize the conductive layer generating a pressure wave in the direction of the part. Additionally, the induced current is configured to accelerate the part in the direction of the matrix in association with a magnetic field generated by the coil, pressing the part against the matrix, thereby shaping the part. Further, a method for welding a part using a magnetic pulse is provided.

Abstract: An electrohydraulic forming device for forming a blank of material includes: —an electrohydraulic forming chamber, —at least one central electrode extending in a so-called longitudinal direction and comprising a first end arranged inside the electrohydraulic forming chamber, —a body provided with a bore for introducing each central electrode into the electrohydraulic forming chamber, the electrohydraulic forming chamber being partially formed by said body, —a mould, and —at least one peripheral electrode electrically insulated from each central electrode, arranged at a distance from and around the end of a central electrode, and extending in a transverse plane relative to said central electrode.

Abstract: A method for electrohydraulically forming a blank of material includes—a blank of material to be deformed is placed between a mould and a blank holder, —a cavity containing electrodes is filled with liquid to a predetermined liquid level, —the blank of material is placed in contact with the liquid in the cavity, —a first electric discharge is generated between at least two electrodes so as to deform the blank of material against the mould, —the mould is brought nearer to the electrodes by moving the mould so as to reduce the distance between the electrodes and the blank of material to be deformed after the first electric discharge has been generated, —at least one other electric discharge is generated between at least two electrodes so as to deform the blank of material against the mould.

Abstract: An indirect electrohydraulic draw-forming tool includes a body having a tubular cylindrical area, a chamber intended to be filled with a liquid, two electrodes, each of the electrodes having a portion arranged in the chamber, a punch. The tool also includes a piston mounted so as to slide in a sealed manner within the cylindrical area and sealingly defining the chamber. Moreover, the punch is carried by the piston on a face thereof that is opposite to the chamber.

Abstract: The present invention relates to a device for pulsed electric discharge in a liquid, said device comprising at least one pair of electrodes which are configured to be immersed in said liquid and to generate an electric arc in said liquid when a predetermined voltage is applied between said electrodes, at least one heating unit which is configured to heat said liquid for a so-called “heating” time, at least one discharge unit which is configured to apply a discharge voltage between the electrodes of the at least one pair of electrodes, and at least one control unit which is configured to control the at least one heating unit so that said heating unit heats the liquid for the heating time and to control, at the end of said heating time, the at least one discharge unit so that said at least one discharge unit applies the predetermined voltage between the electrodes of the at least one pair of electrodes and thus generates an electric discharge in the liquid.

Abstract: A method for electrohydraulic forming a material blank includes: a material blank to be shaped is placed between a mould and a blank holder; a tight cavity containing electrodes is filled with liquid up to a predetermined liquid level; the material blank is brought into contact with the liquid of the cavity; the material blank is hydraulically preformed; and the material blank is electrohydraulically formed. The liquid of the cavity is pressurised for the hydraulic preforming by moving all or part of one of the walls of the cavity.

Abstract: An electrohydraulic forming device includes a mold, a tank having a first wall, and a first electrode and second electrode both placed in the tank and adapted to generate an electrical discharge to create at least one pressure wave. The first wall is rotationally symmetric about an axis of revolution, the electrodes have axes of revolution that are coincident with the axis of revolution of the first wall, and the first wall has a concavity oriented towards the mold.

Abstract: An electrohydraulic forming device includes a tank having a tank inner wall and inside of which are positioned a mold, a first electrode, and a second electrode. A free first reflector is placed in the tank and surrounds the mold, the first electrode, and the second electrode.

Abstract: An electrohydraulic forming chamber to form a workpiece. The chamber includes a discharge frame that has an inner wall which delimits a discharge space provided to hold a volume of fluid, a female mold having a forming space which includes an impression configured to be complementary to the shape of the workpiece after deformation, and an electrohydraulic discharge system. The workpiece is placed between the discharge space and the forming space before the electrohydraulic discharge system is activated. Upon activation of the electrohydraulic discharge system, the workpiece is catapulted against the impression in the forming space and is deformed accordingly. All or part of the inner wall is provided with a non-metal coating.

Abstract: A method for the magnetic pulse soldering of an item having a stack of sheets consisting of a metal material. At least one hole through a thickness of the stack is formed. The first and second plates, both consisting of a metal material, are arranged on either side of the stack. A covering area covering at least one through-hole is formed. The plates-stack assembly is positioned opposite an active part of a coil such that a working area of the covering area faces the active part of the coil and the working area covering at least one hole. The working area is subjected to a magnetic field until the assembly is joined. While the working area is subjected to the magnetic field, pressure is exerted on the first plate, in the region of at least one hole, pressing the first plate against the second plate.

Abstract: A method for forming a workpiece by stamping that allows spring back to be eliminated, wherein tooling (20) is used, at least one of the forming parts (21, 23) of which includes a cavity (26) filled with a liquid (27) and provided with electrodes (28) capable of generating at least one shock wave in the cavity and through the wall (25) of the forming part, a blank material (18) is deformed between the two forming parts under the action of a deformation pressure and, without releasing the deformation pressure, at least one shock wave is generated in the cavity so that the shock wave passes through the blank material orthogonal to its surface. The tooling (20) and a press (10) adapted to implement the method are also described.

Abstract: A method for attaching a metal ring (4) in a bore (3) of a frame (2) made of a different metal, wherein: the ring (4) is set in the bore (3) by way of high-energy forming suitable for urging an outer surface of the ring against the bore (3) with a speed capable of driving out any impurity from an interface between the ring and the frame; the interface between the ring (4) and the frame (2) is heated to a temperature and for a length of time that are determined in accordance with the respective materials of the ring and the frame such as to obtain diffusion welding between the outer surface of the ring and the bore. A single-turn coil for magnetic forming carried out by the method is also described.

Abstract: An electrohydraulic forming device comprising a framework, a tank, a movable enclosure comprising a cover, a mold connected to the cover by a support structure, a forming chamber and a discharge chamber with at least one electrode device. The enclosure is movable between a first position in which the tank is closed by the cover and a second position in which the discharge chamber and the forming chamber are outside the tank.

Abstract: A head of an electrohydraulic discharge device of the invention comprises: —an end of a power cable having a first conductor and a second conductor, —an explosive wire comprising multiple segments assembled in a series, and —means for connecting each of the ends of the explosive wire to the end of the power cable.

Abstract: A device and a method for forming by stamping a curved metal sheet. The device includes a punch made of deformable and substantially non-compressible material, a hammer configured to strike the punch along the longitudinal axis Z. A generator to generate a magnetic field configured to impart on the hammer a speed greater than a predetermined speed in the Z direction. The device further includes a matrix of predetermined shape, approximately rotationally symmetrical about the longitudinal axis Z. The punch is rotationally symmetrical about the longitudinal axis and configured to be disposed in front of the matrix. The punch has a longitudinal dimension in the same order of magnitude as its dimension perpendicular to the longitudinal axis Z.

Abstract: A head of an electrohydraulic discharge device of the invention comprises: an end of a power cable having a first conductor and a second conductor, an explosive wire comprising multiple segments assembled in a series, and means for connecting each of the ends of the explosive wire to the end of the power cable.