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.

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.

According to an aspect of the disclosure, there may be provided a peening apparatus for generating a compressive residual stress on a pipe member including at least one curved round portion and having a hollow inside formed therein in which a first fluid and a second fluid, which is in a gas phase, are accommodated, the apparatus including: a probe which is disposed such that it is submerged in the first fluid supplied to the hollow inside, and which is configured to apply a wave to the first fluid, wherein the first fluid and the second fluid have different acoustic impedances, so that the wave is totally reflected on a reflection surface where the first fluid and the second fluid are in contact, and forms a standing wave, and wherein a cavity generated and grown by the formed standing wave is exploded and emits a shock wave or microjet, which generates a compressive residual stress on the inner surface of the pipe member surrounding the hollow inside.

An electro-hydraulic forming machine (1) for the plastic deformation of a projectile part (P13) of the wall (P1) of a workpiece (P) to be formed, preferably a cylindrical tubular workpiece, via a forming fluid (F), includes a tool (4) for applying the forming fluid on the inner face (P11) of the projectile part (P13), the application tool (4) including:a chamber (44) intended to contain the forming fluid (F), cooperating with elements (3) for generating a shock wave in the forming fluid (F) intended to be contained in the chamber (44), andat least one downstream port (42), intended to open opposite the projectile part (P13) of the wall (P1) to be deformed and in fluid communication with the chamber (44), in order to allow the passage of the forming fluid and for propagating the generated shock wave towards the footprint (22) of a target support (2).

An electro-hydraulic forming machine (1) for the plastic deformation of a projectile part (P13) of the wall (P1) of a workpiece (P) to be formed, preferably a cylindrical tubular workpiece, via a forming fluid (F), includes a tool (4) for applying the forming fluid on the inner face (P11) of the projectile part (P13), the application tool (4) including:a chamber (44) intended to contain the forming fluid (F), cooperating with elements (3) for generating a shock wave in the forming fluid (F) intended to be contained in the chamber (44), andat least one downstream port (42), intended to open opposite the projectile part (P13) of the wall (P1) to be deformed and in fluid communication with the chamber (44), in order to allow the passage of the forming fluid and for propagating the generated shock wave towards the footprint (22) of a target support (2).

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.

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.

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.

A method for controlling a superplastic forming machine for imprinting a shape on a sheet, the machine comprising: a cover; a vat; a press and a peripheral seal for gripping the sheet at its periphery and sealing a pressurized forming chamber delimited by the sheet; members for heating the sheet directly by radiation, these being arranged facing the sheet; a programmable controller. The method involves: determining an initial heating configuration; a finite-element simulation relating to the temperature of the sheet and performed in such a way as to have a temperature that is substantially consistent across the sheet and substantially constant during the course of the forming, in order to obtain a forming specification comprising at least a cycle of powering the heating members and a cycle of pressure in the forming chamber; programming the programmable controller according to the forming specification yielded by the previous simulation.

A high-speed hot forming and direct quenching method and apparatus are disclosed. A first step of the method can comprise various pre-processing steps that can prepare a workpiece for the apparatus. A second step involves a heat-treatment of the workpiece. A third step comprises hot forming the workpiece and primary quenching of the workpiece. A fourth step can comprise a secondary quenching of the workpiece.