WO2008028982A1 - Electromagnetic device and method for the geometric rectification of stamped metal parts - Google Patents

Abstract

The invention relates to an electromagnetic device and a method for the geometric rectification of stamped metal parts. The invention includes at least one block (2) having a surface with an end geometry (10) which is to be obtained on one face of an area of a part (1) to be rectified, said part being positioned between the block (2) and a complementary electromagnetic coil (5) comprising at least one winding (6) designed to generate a magnetic field configured to act on the part (1) such that it impacts against the block (2). A space is provided between each electromagnetic coil (5) and each block (2) which is no greater than ten times the thickness of the part (1), so that the object can be moved by the magnetic field.

Description

 ELECTROMAGNETIC DEVICE AND METHOD FOR THE GEOMETRIC RECTIFICATION OF STAMPED METAL PARTS

D E S C R I P C I Ó N

OBJECT OF THE INVENTION

The present invention relates to an electromagnetic device and a method for the geometric rectification of stamped metal parts that has application in the steel industry, allowing the rectification of the deformation produced by the elastic recovery as a consequence of the residual stresses that occur. generated in this type of sheet-shaped parts after the completion of a mechanical forming process, for example after a drawing process.

BACKGROUND OF THE INVENTION

The conventional stamping process of sheet metal requires the use of a press and at least two dies, one embutidor and another calibrator, each of which is in turn made up of a trampler, a matrix and a complete male that have all the geometry, shape and dimensions, which is required to obtain in the sheet to be shaped.

The problem of the processes of mechanical stamping, manifests itself after the extraction of the pieces of the press, because they experience an elastic recovery that produces deformations, wall curls and torsions as a result of the residual tensions that are generated in the pieces after the drawing process, with which the geometry of the piece is different from what is required to obtain.

The problem mentioned in the previous paragraph is usually known by its term in English as "springback", and has as a consequence that the pieces obtained are outside established tolerances, which, especially in certain applications such as in the sector of the automotive industry or in the aeronautical sector, they are very strict, so the need to rectify the geometry of the pieces obtained after the drawing process is raised.

In order to solve this problem, after the mechanical drawing process has been carried out, it is necessary to carry out a reconform of the complete piece in a calibrating die, in which the grinding of those areas of the piece that are outside the permissible tolerances is achieved. after the mechanical drawing process, which significantly increases the production costs of the pieces.

On the other hand, in order to solve this same problem, from 1960 onwards, alternative forming processes emerged that include circuits and electromagnetic means capable of generating enough currents to produce a deformation in the material, replacing the traditional presses usually used so far, as described above.

These electromagnetic forming processes are based on the generation of a magnetic field by electromagnetic coils that induce currents of

Foucault in the piece or sheet to conform, having said Foucault currents in the opposite direction to those that circulate through each electromagnetic coil, so that the coil and the metal part are repelled so that the piece is actuated against the wall of the dies, adopting the form that is required, that is to say They have the dies, which matches the final geometry of the complete piece that is intended to be obtained.

At present, the aforementioned electromagnetic forming devices comprise a conductor, also called an actuator, which is usually a copper solenium coil that is connected in series with a capacitor, or usually with a capacitor bank, and with a high circuit. Fast ignition voltage and media.

The operation of these devices is explained below. When the capacitors are charged and turn on, that is to say the circuit breaker that connects it to the electromagnetic coil is closed, a transient current is created in said electromagnetic coil, which generates a transient magnetic field that induces Foucault currents in the conductive material, which is the metal piece that is intended to deform.

A representation of the commonly used discharge current has a damped sinusoidal shape, with frequencies that are usually in a range between 10 kHz and 100 kHz. The current generated in the electromagnetic coil and the currents generated in the piece have the opposite direction, whereby coil and piece repel each other, so that the piece acquires a high repulsion speed, being actuated against a male or female element and taking its shape The electromagnetic pressure is it transforms into kinetic energy, being able to acquire the piece speeds of an order of magnitude that is between 200 m / s and 300 m / s.

These electromagnetic forming processes have been the subject of numerous studies by various authors, which are collected in different documents, such as in the following articles:

- Golovashchenko, Sergey F. ^ Springback calibration using pulsed electromagnetic field '; © 2005 American Institute of Physics.

Moon, F. C. ^ Magneto solid mechanics'; ASTME;

High Velocity Forming of Metals; 1968. - Plum, MM ^and Electromagnetic forming. Metals handbook '; Maxwell Laboratories Inc. Pages

644-653.

Belyy, I. V., Fertik, S. M. and Khimenko, L. T.

^ Electromagnetic metal forming handbook Kharkov '; USSR; 1977.

There are also patent documents that describe these electromagnetic forming procedures from the beginning of their development, such as US Patent No. 2,976,907 for "Device and method of metal forming" corresponding to the year 1961, to more recent documents in which they include the latest media and applications, such as in US Patent No. US 6,050,121 for "Hybrid methods of metal forming by electromagnetic forming" in favor of the University of Ohio, in US Patent No. US 5,730,016 for "Method and apparatus for formed by electromagnetic sheet metal "in favor of the firm Elmag, Inc., in US patent application No. US 2005/0097934 for" Apparatus for Electromagnetic forming ", in US patent application No. US 2005/0229376 for" Electromagnetic apparatus and method for cutting, drawing and folding "in favor of General Motors, in US patent application No. US 2003/0182005 by" Method for obtaining a die for forming metal parts with a required shape and related methods "in favor of Chu, E., Makosey, SJ and Shoup, JM or in US Patent No. US 5,860,306 for" Method of use of an electromagnetic actuator and article manufactured with it "in favor of Daehn, to name a few examples.

Additionally, Japanese patents No. JP 2004-122177 and JP 2001-252788 describe processes with printing presses that incorporate a magnetic forming device that avoids the "springback" effect. Japanese Patent No. JP 2004-122177 describes a line of presses or equipment comprising a plurality of presses, commonly referred to as ^λ transfer ', which contains at least one electromagnetic forming station in the press itself in order to obtain a piece of Aluminum without elastic recovery, with a certain final geometry.

The main drawback that this type of equipment presents is that they are extremely complex and expensive due to the need to incorporate the means of electromagnetic forming in the equipment for stamping itself, that is to say in the presses themselves.

The electromagnetic forming operation is carried out simultaneously with the stamping operation, which requires the use of expensive equipment or the adaptation of existing equipment of stamping, combining electromagnetic means with the stamping process itself, which significantly increases the production costs of the pieces.

In addition, although the sheets formed by the aforementioned electromagnetic processes do not have the unwanted effect of elastic recovery, or "springback" effect, these processes have other problems, among other causes as a result of the high temperature of the magnetic field. generated produces in the electromagnetic coil, needing to incorporate cooling means in order that the temperature of the electromagnetic coil during the process is not excessive and thus extend its useful life, which is not necessary in the presses of mechanical stamping.

DESCRIPTION OF THE INVENTION

The electromagnetic device and the method for the geometric rectification of stamped metal parts that the invention proposes allow to correct the deformation produced by the effect of the elastic recovery after a conventional forming process, in an independent equipment to the one of mechanical stamping by means of the application of Electromagnetic loads only in those areas or parts of the part that need to be rectified to obtain a piece with a required final geometry and in accordance with established dimensional tolerances.

A first aspect of the present invention relates to an electromagnetic device for the geometric rectification of stamped metal parts that allows a rectification of the deformation produced by the elastic recovery as a result of the residual stresses that are generated in the pieces after the completion of a mechanical stamping process.

The electromagnetic device proposed by the invention comprises at least one block configured to receive the impact and contact a face of a certain area to be rectified of a piece, that is, a sheet that has been previously mechanically stamped on a press.

The geometry of a surface of said, at least one, block configured to contact the piece to be rectified corresponds exactly to a final geometry, that is, shape and dimensions, which is required to obtain on said face of the area to be rectified from the piece.

Although in the field of stamping, an element that penetrates a plane defined by the sheet is usually called male, and a complementary element configured to accommodate the sheet deformed by the action of said male, in the description of the present The invention means a block as any element such as a male, a matrix or an insert that has the appropriate geometry and is configured to receive the impact and contact the part to be rectified.

In addition to each, at least one, block, the device comprises an electromagnetic coil that is configured to be positioned on a face opposite to that of said at least one block of a certain area to be rectified from the part.

In the event that a block is located on the first side of the piece, then the coil Complementary electromagnetic is located on a second face, opposite the first face, and vice versa, that is, in the case that a block is located on the second face of the piece, then the electromagnetic coil is located on the first face.

Each, at least one, electromagnetic coil comprises at least one winding of a copper wire, which is embedded in a piece, preferably a synthetic body for example of fiberglass. Said electromagnetic coil has an outer surface facing a face of the piece to be rectified, which has a geometry approximate to the final geometry that is to be obtained in the piece, that is to say it has a geometry complementary to that of the at least one corresponding block. , there is a gap or clearance between each, at least one, electromagnetic coil and each, at least one, block that is less than ten times the thickness of the piece, so that the action of the magnetic field drives the piece for its impact against the cue.

As mentioned above each, at least one, electromagnetic coil comprises at least one winding that is connected to a power source, configured to generate a magnetic field.

Each, at least one, electromagnetic coil is operatively located so that the magnetic field that it generates acts in a certain area to be rectified of the piece, acting on it and producing an impact of the piece against the corresponding block.

Each, at least one, electromagnetic coil is configured to act in both the flat areas of the piece as in curved areas or folding lines, that is to say in areas where the sheet has a change of direction between planes.

In a stamped piece the joints between two sides of the same that are contained in different planes have a certain radius, preferably in these areas, where the piece is folded, in which there is the unwanted effect of elastic recovery, appreciating an unwanted deformation. In order to eliminate this deformation each, at least one, winding and electromagnetic coil have an approximate geometry to the final geometry to be obtained, including a curved geometry.

In order to be able to generate the electromagnetic field every, at least one, winding is connected to a discharge circuit comprising a capacitor, preferably a capacitor bank, and a high voltage circuit comprising a power supply source and means of fast ignition, that is to say electrical switches, so that when the capacitors are charged and activated by means of rapid ignition, a transient current is created in each, at least one, winding generated by the transient magnetic field.

Said magnetic field induces eddy currents in the piece to be rectified, because it is a sheet of an electrically conductive material, the current generated in each at least one winding and the eddy currents generated in the felt part. on the contrary, so that the piece is driven in a direction opposite to that of each, at least one, electromagnetic coil, being pushed against said, at least a, block, so that the face of the areas to be rectified of the piece in contact with said, at least one, block is formed by acquiring the geometry of said, at least one block.

The possibility is contemplated that said at least one block and electromagnetic coil are linked to both a first base and a second base, in order to serve as a support. It also contemplates the possibility that said first base and said second base comprise means of mobile closure, being able to be arranged both horizontally and vertically.

Finally, the possibility is contemplated that the device comprises at least one accelerator, commonly referred to in English as 'driver', located between said at least one electromagnetic coil and the part to be rectified, in order to reduce the energy requirements of the device to obtain a certain geometry in a piece to be rectified.

Said accelerator consists of a sheet of a material with a high copper content, which, due to its high electrical conductivity, allows the accelerator to generate induced currents of greater intensity than those generated in the part, which is a sheet of material with lower electrical conductivity. For this reason, the repulsive force between the accelerator and the electromagnetic coil is higher compared to the case of not having said accelerator, allowing the same results to be obtained with lower energy requirements.

On the other hand, a second aspect of the invention relates to a method for geometric rectification of stamped metal parts, with a device Electromagnetic as described above.

The method of the invention is carried out from a metal part to be rectified, that is, a sheet that has already been mechanically stamped, in a traditional press, in order to rectify the geometry of the piece in those areas where the It is outside established tolerances. Unlike the prior art methods, it is not a question of avoiding the negative effect of the elastic recovery of the piece when stamping the piece, but of correcting it afterwards.

Thus, the method for the geometric rectification of stamped metal parts, object of the invention comprises the steps described below.

A first stage comprising positioning a stamped part with each zone to be rectified operatively located between a block and an electromagnetic coil, said part being conveniently separated from the block, which is separated from the complementary electromagnetic coil a distance not exceeding ten times the thickness of the piece, in order that said piece may impact said block by the action of a magnetic field generated by said electromagnetic coil.

Next, the method comprises a second stage which comprises generating a magnetic field configured to act in the areas to be rectified of the piece so that they adopt a final geometry required when the piece is hit against each block.

Finally the method comprises a third stage which comprises extracting the already rectified piece.

The possibility is contemplated that the method comprises an intermediate stage, which will be carried out prior to the second stage of the magnetic field generation, and which comprises placing at least one accelerator, that is to say a sheet of a material with a high content in copper, between said at least one, electromagnetic coil and the piece to be rectified, in order to reduce the energy requirements of the method.

The deformation of the metal part to be rectified is achieved by discharging an electric current through said at least one winding that is close to the area to be rectified of the part. Due to the currents that are induced in the piece, rapid movement occurs in the area of the part near the coil. The kinetic energy associated with the movement causes the physical change in the piece.

Thus, in accordance with the described invention, the electromagnetic device and method for the geometric rectification of stamped metal parts that the invention proposes constitute an advance in the forming devices and methods used up to now, and solve in a fully satisfactory and simple manner the problematic previously exposed, in the line of allowing its use in all types of sheets, whatever its forming process has been, allowing the use and habitual use of the available stamping equipment such as traditional presses in a certain factory, that is, without the need of having to make any modification on them, to later rectify the pieces in the device of the invention, external to the press line, only in cases where it is necessary.

Therefore, the user can manufacture a part by means of a conventional stamping process and, in view of the result, decide whether it is necessary to use the electromagnetic forming device of the invention for its rectification.

The device proposed by the invention is different from the electromagnetic forming devices of the state of the art as it does not require an upper matrix and a lower matrix that accurately reproduce the final geometry, both the shape and dimensions, of the entire piece a obtained because the magnetic field acts only in those areas where the part is outside the permissible tolerances, with the consequent reduction of costs.

The electromagnetic device proposed by the invention is extremely simple and inexpensive to manufacture, by using at least one block and at least one electromagnetic coil that allows its adaptation to each type of geometry.

Said, at least one, block and said, at least one, electromagnetic coil are interchangeable, adapting to each area to be rectified, so if your design is taken care of, the same pair consisting of a block and an electromagnetic coil can be used for rectification of different pieces, being located in areas that have the same final geometry to obtain.

Therefore the cost is much lower than in the case of having to have a trampler, a matrix and a complete male, having exactly the complete final geometry of the entire sheet to obtain.

This device eliminates the need to make successive corrections in the geometry of conventional stamping dies to eliminate the effect called "springback" on the piece. These corrections are generally made through an iterative process of correction, trial and error, with the great increase in costs that this entails.

The device of the invention replaces the mechanical caliper die, which can be dispensed with, with the consequent saving of space in a factory, reduction of initial costs by eliminating a die and possibility of using press lines with a less station.

In addition, the device of the invention, in comparison with the devices and procedures described in Japanese patents No. JP 2004-122177 and JP 2001-252788, allows, in addition to the above-mentioned advantages, the rectification of all types of parts, preferably sheets, of conductive metal materials, such as steels.

DESCRIPTION OF THE DRAWINGS

To complement the description that is being made and in order to help a better understanding of the features of the invention, according to a preferred example of practical realization thereof, a set of drawings is attached as an integral part of said description where Illustrative and non-limiting, the following has been represented: Figure 1.- Shows an electrical scheme of the discharge circuit comprising the device of the invention and which allows the generation of a magnetic field for the rectification of metal parts.

Figure 2. - It shows a section of a final geometry to be obtained for a piece and a geometry obtained after a conventional stamping process, the latter being appreciated the "springback" effect, in comparison with the final geometry to be obtained.

Figure 3.- Shows a section of an elevation view of a schematic representation of the electromagnetic device proposed by the invention, in which the situation of a piece to be rectified can be seen.

Figure 4.- Shows a section according to a plan view of an embodiment of the device of the invention, in which three plugs and three electromagnetic coils can be seen in three areas to be rectified of the sheet, on a base design of a die of conventional printing, in which the simplicity of the device object of the invention can be checked against the complexity of a conventional printing die.

Figure 5.- Shows an elevation view of the electromagnetic device of the invention according to the A-A direction of the previous figure.

Figure 6.- Shows a section of an elevation view, according to the B-B cut line shown in the figure

4, in which a block and an electromagnetic coil located in correspondence can be seen, among which is a piece to be rectified. Figure 7- Shows another section of an elevation view like the one in the previous figure, according to the cut-off line CC shown in figure 4.

Figure 8 shows a flow chart in which the main steps comprising the method for geometric rectification of stamped metal parts proposed by the invention can be seen.

PREFERRED EMBODIMENT OF THE INVENTION

In view of the aforementioned figures, it can be seen that in one of the possible embodiments of the invention, the electromagnetic device for the geometric rectification of stamped metal parts comprises at least one block (2) configured to receive the impact and contact a face of a certain area to rectify a piece (1).

The geometry of a surface of said, at least one, block (2) configured to contact the part (1) to be rectified corresponds exactly to a final geometry (10) that is required to obtain on said face of the area to be rectified from the piece (1).

In addition to each, at least one, taco

(2), the device comprises an electromagnetic coil

(5) which is configured to be located on a face opposite to said face, at least one, block (2) of a certain area to be rectified of the piece (1).

In the event that a block (2) is located on a first face (12) of the part (1), then the complementary electromagnetic coil (5) is located on a second face (11), opposite the first face ( 12 and vice versa, that is, in the case that a block (2) is located on the second face (11) of the part (1), then the electromagnetic coil (5) is located on the first face (12).

Each, at least one, electromagnetic coil (5) comprises at least one winding (6) embedded in a piece, preferably a synthetic body for example of fiberglass. Said electromagnetic coil (5) has an outer surface facing a face of the piece

(1), which has an approximate geometry to the final geometry (10) that is to be obtained in the piece (1), there is a gap or clearance between each, at least one, electromagnetic coil (5) and each, at least one , block (2) which is less than ten times the thickness of the piece (1), so that the action of the magnetic field drives the piece (1) for its impact against the block (2).

As reflected in Figures 1 and 3, each, at least one, electromagnetic coil (5) comprises at least one winding (6) that is connected to an electrical power source (7), configured to generate a magnetic field .

Each, at least one, electromagnetic coil (5) is operatively located so that the magnetic field that it generates acts in a certain area to be rectified of the piece (1), acting on it and producing an impact of the piece (1) against the corresponding block (2).

Each, at least one, winding (6) is connected to a discharge circuit comprising a capacitor (8), preferably a capacitor bank (8), and a high voltage circuit comprising a power supply (7) Y rapid ignition means (9), so that when the capacitors (8) are charged and activated by means of rapid ignition (9), a transient current is created in each at least one winding (6) that generates the transient magnetic field.

Said magnetic field induces eddy currents in the part (1) to be rectified, whereby the part (1) is actuated in a direction opposite to that of each, at least one, electromagnetic coil (5), being pushed against said , at least one, block (2), so that the face of the areas to be rectified of the piece (1) in contact with said, at least one, block (2) is formed by acquiring the geometry of said, at least one , cue (2).

As shown in Figures 3 to 7, the possibility is contemplated that said at least one block (2) and electromagnetic coil (5) are linked to both a first base (3) and a second base ( 4), in order to serve as support.

It also contemplates the possibility that said first base (3) and said second base (4) comprise means of mobile closure to facilitate the extraction of the piece (1), being able to be arranged both horizontally and vertically.

In the embodiment shown in Figures 4 to 7, the device comprises a first block (2) located in a complementary manner to a first electromagnetic coil (5) comprising a first winding (6). On the other hand, the device comprises a second block (2 ') located in a complementary manner to a second electromagnetic coil (5') comprising a second winding (6 '). Finally, the device comprises a third block {2 '') located so complementary to a third electromagnetic coil (5 '') comprising a third winding (6 '') arranged perpendicular to the first winding (6) and the second winding (6 ').

As can be seen in Figure 6, the first winding (6) has a geometry that adapts to the curved area of the final geometry (10) to be obtained in the piece.

In this embodiment the first block (2), the third block (2 '') and the second electromagnetic coil (5 ') are linked to the first base (3) while the second block (2'), the first electromagnetic coil (5) and the third electromagnetic coil (5 '') are linked to the second base (4).

Finally, the possibility is contemplated that the device comprises at least one accelerator (13), which consists of a sheet of a material with a high copper content, as can be seen in Figure 3, located between said, at least one, electromagnetic coil (5) and the part (1) to be rectified, in order to reduce the energy requirements of the device to obtain a certain geometry in a part (1) to be rectified.

A second aspect of the invention relates to a method for geometric rectification of stamped metal parts, with an electromagnetic device as described above.

The method of the invention is carried out from a metal part to be rectified, that is, a sheet that has already been mechanically stamped, in a traditional press, in order to rectify the geometry of the piece in those areas where it is outside established tolerances.

As can be seen in Figure 8, the method for geometric rectification of stamped metal parts, object of the invention comprises the following steps:

A first stage (A) comprising positioning a stamped part (1) with each zone to be rectified operatively located between a block (2) and an electromagnetic coil (5), said part (1) being conveniently separated from the block (2), which is separated from the electromagnetic coil (5) complementary a distance not exceeding ten times the thickness of the piece (D -

A second stage (B) comprising generating a magnetic field configured to act in the areas to be rectified of the piece (1) so that they adopt a final geometry (10) required when the piece (1) impacts against each block (2) .

A third stage (C) comprising extracting the already rectified piece.

The possibility is contemplated that the method comprises an intermediate stage, which will be carried out prior to the second stage (B), and which comprises placing at least one accelerator (13), that is to say a sheet of a material with a high content in copper, between said at least one, electromagnetic coil (5) and the part (1) to be rectified, in order to reduce the energy requirements of the method.

In view of this description and game of figures, the person skilled in the art will be able to understand that the embodiments of the invention that have been described can be combined in multiple ways within the object of the invention. The invention has been described according to some preferred embodiments thereof, but it will be apparent to the person skilled in the art that multiple variations can be introduced in said preferred embodiments without exceeding the object of the claimed invention.

Claims

1.- Electromagnetic device for geometric rectification of stamped metal parts characterized in that it comprises: - at least one block (2) configured to contact a face of an area to be rectified of a stamped metal part (1), the geometry of a surface of said surface coinciding, at least one, block (2) configured to contact the piece (1) with a final geometry (10) that it is required to obtain on said face of the area to be rectified of the piece (1), at least one electromagnetic coil (5) configured to be positioned on a face opposite to said face, at least one block (2) of said area to be rectified of the piece (1), - at least one winding (6) comprising embedded each, at least one, electromagnetic coil (5), said winding (6) being configured to generate a magnetic field operatively configured to act on the part (1) and produce its impact against the corresponding block (2), - a space between each, at least one, electromagnetic coil (5) and each, at least one, block (2) not more than ten times a thickness of the piece (1). 2. Electromagnetic device for geometric rectification of stamped metal parts according to claim 1, characterized in that each, at least one, block (2) and each, at least one electromagnetic coil (5) are linked to a first base (3) and with a second base (4). 3. Electromagnetic device for geometric rectification of stamped metal parts according to claim 2, characterized in that the "First base (3) and second base (4) comprise movable locking means. 4. Electromagnetic device for geometric rectification of stamped metal parts according to any of claims 2 and 3, characterized in that it comprises: a first block (2) complementary to a first electromagnetic coil (5) comprising a first winding ( 6), - a second block (2 ') complementary to a second electromagnetic coil (5') comprising a second winding (6 '), - a third block (2 '') located in a complementary manner to a third electromagnetic coil (5 '') comprising a third winding (6 '') arranged perpendicular to the first winding (6) and the second winding (6 ' )> 5. Electromagnetic device for geometric rectification of stamped metal parts according to claim 4, characterized in that the first block (2), the third block (2 '') and the second electromagnetic coil (5 ') are linked to the first base (3) while the second block (2 '), the first electromagnetic coil (5) and the third electromagnetic coil (5' ') are linked to the second base (4). 6.- Electromagnetic device for geometric rectification of stamped metal parts according to any of claims 1 to 3, characterized in that the area to be rectified of the part (1) corresponds to practically the entire surface of said part (1). 7. Electromagnetic device for geometric rectification of stamped metal parts according to any of the preceding claims, characterized in that it comprises at least one accelerator (13) consisting of a sheet of a material with a high copper content, located between said, at minus one, electromagnetic coil (5) and the part (1) to be rectified, to reduce the energy requirements of the device to obtain a certain geometry in a part (1) to be rectified. 8. Electromagnetic device for the geometric rectification of stamped metal parts according to any of the preceding claims, characterized in that at least one electromagnetic coil (5) comprises a body of synthetic material, said body having at least one surface configured to face a face of the piece (1) with a geometry that substantially corresponds to the final geometry (10) that is required to obtain in said face of said area to be rectified of the piece (1). 9. Method for the geometric rectification of stamped metal parts, with a device according to any of the preceding claims, characterized in that it comprises the following steps: - a first stage (A) comprising positioning a stamped part (1) with each zone to be rectified operatively located between a block (2) and an electromagnetic coil (5), said piece (1) being conveniently separated from the block (2), which is separated from the electromagnetic coil (5) complementary a distance not exceeding ten times the thickness of the piece (1), - a second stage (B) comprising generating a magnetic field configured to act in the areas to be rectified of the piece (1) so that they adopt a final geometry (10) required when the piece (1) impacts against each block (2) ), - a third stage (C) comprising extracting the already rectified part. 10. Method for the geometric rectification of stamped metal parts, according to claim 9, characterized in that it comprises an intermediate stage, prior to the second stage (B), which comprises placing at least one accelerator (13), that is to say a metal sheet. a material with a high copper content, between said at least one, electromagnetic coil (5) and the part (1) to be rectified, in order to reduce the energy requirements of the method.