Method for production of pieces for passive electronic components

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The present invention relates to a method of manufacturing parts for passive electronic components obtained by cutting from a laminated strip consisting of a stack of thin and fragile metal strips, and in particular of thin metal strips made of a nanocrystalline alloy.

Nanocrystalline alloys and in particular nanocrystalline alloys of the Fe Cu Nb B Si or Fe Zr B Si type, or still other types, are well known. These alloys, which have excellent magnetic properties, are obtained by heat treatment of amorphous alloy strips obtained by ultra-rapid solidification of a liquid metal. These bands, particularly suitable for the manufacture of a magnetic core with very high permeability, in particular at low frequency, however have the drawback of being extremely fragile. Also, to manufacture magnetic cores using these nanocrystalline alloy strips, it has been proposed to wind strips of amorphous alloys to form coils, then to carry out heat treatments on these coils to impart to the coils. alloy a nanocrystalline structure. Magnetic cores are thus obtained which have excellent magnetic properties, but which have the drawback of having only one possible shape, which is that of a coil.

In order to manufacture magnetic cores of nanocrystalline alloy having different shapes from the coils, it has been proposed to produce laminated strips consisting of a stack of strips of a nanocrystalline alloy bonded together using a glue or a resin, then cut these laminated strips by mechanical means such as shearing or by laser, so as to obtain cores having the desired shape. However, this technique has a drawback, because owing to the very great fragility of the strips of nanocrystalline alloy, mechanical or laser cutting runs the risk of generating cracks inside the nanocrystalline strips which considerably deteriorate the magnetic properties of the cores obtained.

In order to be able to handle the extremely fragile nanocrystalline ribbons more easily, a method has been proposed in particular in patent FR 2 788 455 for assembling the nanocrystalline ribbons with polymer bands, which makes it possible to handle them more easily. These nanocrystalline ribbons associated with polymer ribbons can then be stacked and etched to manufacture magnetic cores which can be used for the production of magnetic components buried in printed circuits or for the production of discrete nanocrystalline magnetic components. This process, which uses chemical etching, has the advantage of being well mastered. However, this manufacturing technique is slow and complex. In fact, due to the presence of strips of polymeric materials on which nanocrystalline strips are bonded, it is necessary to etch each strip before stacking the different strips in order to obtain a component having the desired dimensions.

The aim of the present invention is to remedy these drawbacks by proposing a means for manufacturing parts for passive electronic components, in particular magnetic electronic components, made up of a stack of thin and fragile metal strips, and in particular of alloy strips. nanocrystalline, and having a wide variety of shapes.

To this end, the subject of the invention is a method of manufacturing parts for passive electronic components according to which a laminated strip consisting of at least one stack of a thin and fragile metal strip and of a layer of a material is manufactured. adhesive, and at least one part is cut from the laminated strip by a process comprising at least one sandblasting etching step. In this process, which is well suited to fragile and brittle materials, the drawbacks of nanocrystalline materials, that is to say their brittleness and the handling problems which result therefrom, become an advantage.

Preferably, the layer of an adhesive material of the at least one stack is a layer of a hard and brittle adhesive material.

In order to carry out at least one etching step by sandblasting, there is placed on one face of the laminated strip a cover made of a material resistant to sandblasting, comprising openings having at least one shape according to which it is desired to engrave at least one laminated strip.

The cover is for example a steel strip resistant to etching by sandblasting, or an elastic layer such as a layer of paint deposited by screen printing, or a layer of elastic photosensitive resin which is exposed to radiation and for example to ultraviolet rays or electron beams through a mask with suitable cutouts and which is developed by immersion in a bath.

The laminated strip may consist of at least two alternating stacks of thin metal strips and layers of a hard and fragile adhesive material, the at least two alternating stacks being superimposed and separated by an adhesive layer of which at least a part of the layer. surface is made of an elastic material resistant to etching by sandblasting.

Preferably, in order to carry out the etching by sandblasting, the laminated strip is glued on a support strip. After sandblasting, the cut laminate strip and the support strip can be separated.

To perform the etching by sandblasting, it is then possible to place the laminated strip arranged on the support strip, in a sandblasting engraving chamber comprising at least one sandblasting nozzle producing a jet of abrasive particles, and a relative movement of the strip is made. laminate and at least one sandblasting nozzle to sweep the surface of the laminate web by the jet of abrasive particles.

By this process, it is possible to etch on the laminated strip a plurality of parts for electronic components connected to each other by attachment points, which are separated.

The hard and fragile material is for example an epoxy glue.

Preferably, the thin metal strips are made of a material taken from the following alloys: nanocrystalline magnetic alloys, brittle iron-cobalt magnetic alloys, brittle iron-platinum, brittle iron-silicon, brittle iron-nickel, brittle nickel-chromium alloys , brittle molybdenum alloys and brittle tungsten alloys.

The support strip may be a strip comprising a layer of polymer and a layer of conductive material such as copper which, in addition, may comprise, before cutting by sandblasting, at least one electronic component which is protected at the time of cutting by sandblasting by sandblasting. a layer of elastic material.

The invention also relates to a part capable of being obtained by the method according to the invention, which is for example a core of a passive inductive electronic component which may comprise an air gap and which may also comprise at least two parts of different thicknesses.

The part can also constitute an electrical resistance or a capacitor.

The invention also relates to a plate intended to be incorporated into a printed circuit, consisting of a layer of conductive material and of a layer of elastic polymer material, on which is bonded a piece of electronic component capable of being obtained by the method according to the invention.

The invention further relates to a method of manufacturing an inductive passive electronic component of the type comprising a part cut from a laminated strip consisting of a stack of thin metal strips made of a magnetic alloy, in which said part is produced by the method. according to the invention, and at least one winding and the coating of the component are made with a protective material.

When the passive electronic component is capacitive or resistive, the component comprises a part cut from a laminated strip consisting of a stack of thin metal strips and electrical connection means. In this case, the connection means and the coating of the component are also made with a protective material.

The invention finally relates to a method of manufacturing a printed circuit comprising at least one passive electronic component comprising at least one part made of a laminated metallic material according to which at least one plate made of laminated metal is stacked and adhered by gluing. a layer of conductive material and a layer of elastic polymer material on which is bonded a part obtained by cutting by sandblasting, and at least one plate comprising a layer of polymer material.

The method of cutting by sandblasting a laminated strip consisting of an alternating stack of strip of very fragile magnetic metallic material and layers of polymer, has the advantage of making it possible to obtain magnetic parts of very diverse shapes free from cracks. , and therefore, having very good magnetic properties.

This process also makes it possible to manufacture thin parts that n by known techniques, manufacture of toroids whose thickness is very large, of thickness less than 1 with a thickness of around 1 mm 'is not possible to manufacture.

In particular, it allows the ratio of the diameter to

These are in particular mm tori, and for example tori with a diameter greater than 10 mm, or tori with a thickness of between 20 μm and 200 μm and with a diameter which may range from 1 to a few millimeters.

The invention will now be described in a more precise but nonlimiting manner with reference to the appended figures, which:

FIG. 1A schematically represents a stack of nanocrystalline strips bonded with a hard and fragile adhesive, arranged on a support strip and on which a mask is placed.

- Figure IB shows the previous stack after sandblasting.

FIG. 2A represents a strip laminated according to FIG. 2A consisting of nanocrystalline strips stacked and glued, in which an adhesive layer consists of an elastic adhesive.

FIG. 2B represents a strip laminated according to FIG. 2A consisting of nanocrystalline strips stacked and glued, of which an adhesive layer consists of an elastic adhesive, after sandblasting.

FIG. 3A represents a laminated strip according to FIG. 2A consisting of nanocrystalline strips stacked and glued together, of which an adhesive layer is partially made of an elastic adhesive. The laminate strip is placed on a support and on the strip is a cover.

FIG. 3B represents the strip of the previous figure after sandblasting.

FIG. 4 represents an assembly made up of a support strip, a laminated strip made up of glued nanocrystalline strips and a cover.

- Figure 5 shows the part obtained after sandblasting.

FIG. 6 is a schematic representation of the method of manufacturing a part for a magnetic component cut by sandblasting from a laminated strip comprising nanocrystalline strips.

- Figures 7A and 7B schematically represent the manufacture of a printed circuit comprising a magnetic core obtained by cutting a nanocrystalline material.

The general principle of the invention consists in manufacturing parts for passive electronic components, and in particular magnetic passive electronic components such as inductors or magnetic cores, obtained by cutting by sandblasting of laminated strips consisting of an alternating stack of strips. brittle metal and layers of a hard, brittle adhesive material. The fragile metallic material has magnetic properties suitable for the manufacture of magnetic electronic components. This material is in particular a nanocrystalline magnetic material of the Fe-Cu-Nb-B-Si or Fe-Zr-B-Si type for example. Such materials are described for example in European patent EP 0 271 657 or in European patent EP 0 299 498. This nanocrystalline material, known in itself, is obtained by heat treatment of an amorphous strip obtained by ultra-rapid solidification of a liquid metal alloy. Such a thin strip has a thickness of between a few microns and a few tens of microns, in particular between 5 and 50 microns, and in general of the order of 20 microns. The hard and brittle adhesive material is a polymer material and for example an adhesive which is either naturally hard and brittle, or which is made hard and brittle by a suitable heat treatment. These materials, generally called thermosets, are in particular unsaturated polyesters, epoxies, phenolics and polyimides.

In one embodiment of the laminated strip, shown in FIG. 1A, the laminated strip generally marked with 1 is homogeneous. It consists of identical thin metal strips 2, and of intermediate layers of hard and fragile adhesive material 3 identical. In FIG. 1A, the laminated strip 1 is glued to a support strip 5, and a cover 4 is arranged on its upper face.

In a second embodiment shown in FIG. 2A, the laminated strip generally marked 10, consists of a first homogeneous laminate layer 11, consisting of a stack of identical thin metal strips 21 separated by layers of hard adhesive material. and brittle 31 and a second laminate layer 12 consisting of a stack of thin metal strips 22 separated by layers 32 of hard and brittle adhesive material. The two laminated layers are separated by an intermediate layer 33 of an elastic adhesive material. In this embodiment, the elastic intermediate layer 33 extends over the entire surface 2 of the laminate strip. The laminated strip thus obtained is heterogeneous. As in the previous case, there is shown in the figure a cover 40 and a support strip 50.

In a third embodiment shown in FIG. 3A, the heterogeneous laminated strip generally identified by 100, is constituted as in the previous case by a first laminated layer 110 consisting of a stack of thin metal strips 210 separated by layers 310 of hard and brittle adhesive material and a second laminated layer 120, consisting of a stack of thin metal strips 220 separated by layers of hard and brittle adhesive material 320, the two laminated layers 110 and 120 being separated part 331 is and another by an intermediate layer 330, consisting of one of a hard material and part 332 adhesive elastic. On is made up of a figure we have fragile, material also represented a support strip 500 and a cover 400.

Other embodiments of heterogeneous laminated bands are conceivable in which several laminated layers consisting of thin metal bands made adherent by layers of hard and fragile material, are separated by intermediate layers consisting partially or totally of an elastic material. When the intermediate layers are only partially made of elastic material, the parts which are not made of elastic material are made of hard and brittle adhesive material.

The homogeneous or heterogeneous laminated strip can be manufactured by any suitable process, and in particular by the processes described in French patent application FR 2 788 455.

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By way of example, and to manufacture a homogeneous laminated strip, one can proceed as follows: by simultaneously unwinding on the one hand a reel of a strip of flexible and resistant adhesive polymer material and a reel of a strip made of thin and fragile metallic material of a nanocrystalline material, the strip of thin metallic material is glued onto the strip of adhesive polymer material, flexible and resistant. A plurality of strips are then produced, thus consisting of a layer of flexible and resistant polymer material and of an adherent layer of thin metallic material. A plurality of these laminated bands are then stacked so as to constitute a laminated composite band comprising thin metal bands separated by layers of adhesive, flexible and resilient polymer material. The laminated strip thus formed is then subjected to a heat treatment intended to make the adhesive layers of polymeric material hard and fragile.

It is also possible to proceed as follows: a first laminated strip is produced by gluing a thin metal strip onto a strip of flexible and resistant adhesive polymer material. Then the thin metal surface is coated with a layer of an adhesive which will be hard and fragile after drying, such as for example an epoxy adhesive. Then a thin metal strip is placed on this layer of adhesive, which is made to adhere. Then the metal surface is coated with a layer of glue which will become hard and fragile after drying, and a new thin metal strip is placed on this layer of glue which is made to adhere. And we continue the process until obtaining a laminated strip of the desired thickness.

If it is desired to produce a heterogeneous composite laminate strip, one first or the other of the methods which have just been laminated strip of the desired thickness is produced, from this described laminated strip, a desired screen printing surface , a band having them, that is to say either a fully constituted susceptible on this then one glues to example by by characteristics band which is either a composite band part has elastic band, of an elastic part and of one of becoming hard and fragile. Then an intermediate layer is a second laminate produced by one or other of the methods described above. Optionally, the operation is repeated the desired number of times.

The laminated bands which have just been described comprise a stack of a plurality of thin metal bands. However, the process is also suitable for laminated tapes comprising only a thin metal layer adhering to a polymer layer.

Before carrying out the cut by sandblasting, there is placed on the face of the laminated strip intended to receive jets of sand, a cover 4, 40, 400, or a mask made of a material resistant to sandblasting and comprising openings 7, 70, 700 having the shapes corresponding to the shapes according to which one wants to cut the laminated strip.

Caching can be done in several ways.

In a first embodiment, the cover is a sufficiently thick metal strip, for example made of steel resistant to sandblasting, and comprising cutouts having the shapes according to which it is desired to cut the laminated strip.

In another embodiment, the cover may consist of a strip of an elastic polymeric material also comprising suitable cutouts. The material must be elastic so that it can withstand sandblasting.

In a third embodiment, the cover is produced by depositing on the surface of the laminated strip a layer of elastic paint resistant to sanding in patterns which correspond to the patterns according to which it is desired to cut the laminated strip. This paint layer is for example deposited by screen printing.

It is also possible to deposit on the laminated strip a layer of photosensitive resin which is exposed to radiation such as ultraviolet rays or to an electron beam through a mask of suitable shape and which is developed in a bath which dissolves non-irradiated parts.

When the cover is a cover of the contact cover type, ie consisting of a plate comprising openings, it is not possible to produce parts disconnected from each other just after sandblasting. On the other hand, when the cover consists, for example, of a layer of photosensitive resin, it is possible to produce parts disconnected from one another and in particular small tori arranged inside the toroids of larger diameter.

These embodiments of the caches are embodiments known in themselves by those skilled in the art.

In order to be able to be handled more easily, the laminated strip 1, 10 or 100 can be placed on a support strip 5, 50 or 500 or on a support plate, made of a material having good mechanical strength and resistant to sandblasting. The laminated strip can be glued to this support strip either by a soluble glue or by a resistant glue. The support strip may, depending on the applications envisaged, be made either of a strong metallic material such as steel, or of an elastic polymer material, or even of a polymer material comprising on its underside a conductive metallic layer of electricity such as a layer of copper.

As shown in FIG. 6, in order to carry out the etching by sandblasting, the assembly consisting of the laminated strip 1, the cover 4, and optionally the support strip 5, is passed through a sandblasting chamber 80, under sandblasting nozzles 81 which project on the upper surface, that is to say on the surface which includes the cover, jets 82 of abrasive particles or abrasive sand. These abrasive particles are for example particles of alumina or silica. At the right of the openings 7, of the cover, the abrasive sand abrades the laminated strip until an abrasion resistant layer is reached. This abrasion of the laminated strip ensures the engraving and cutting of the parts 6. This method, described for a laminated strip according to FIG. 11, applies in the same way to the strips corresponding to the other embodiments of a laminated strip.

The blasting enclosure may include a plurality of nozzles which provide a projection of abrasive particles on a plurality of zones. However, the zones do not necessarily cover the entire surface to be sanded. Also, to ensure sandblasting of the entire surface to be sanded, it is possible to sweep this surface by relative movements of the sandblasting nozzles and of the strip to be sanded. These relative movements can be achieved for example by an alternating movement of the nozzles in a direction perpendicular to the axis of the strip to be sanded and by a movement of the strip to be sanded in a direction parallel to its axis.

When the support is a support plate, it can be placed on a plate driven by two movements in directions mutually perpendicular, parallel to the surface of the plate.

When the laminated strip 1 is a homogeneous laminated strip as shown in FIG. 1A, the sand jet which passes through the openings 7 left free by the mask 4 abrades the strip over its entire thickness until it reaches the support strip 5. Several distinct parts 6 and 6 'shown in FIG. IB are thus obtained, the thickness of which is constant and equal to the thickness of the laminated strip.

When the laminated strip, is a composite laminated strip 10 as shown in FIG. 2A comprising a continuous intermediate layer 33, the sand jets enter through the spaces 70 left free by the mask 40, abrading the upper laminate layer 11 of the strip. laminated, until reaching the intermediate layer 33 of elastic material. There is thus obtained a strip shown in FIG. 2B consisting of a first laminate layer 60 on which laminate elements 61 are arranged, separated by empty spaces. A laminated strip is thus obtained, the thickness of which is not constant. This laminated strip may for example be a strip on which parallel strips have been etched which can constitute a diffraction grating for electromagnetic waves.

When the laminated strip is a composite laminated strip 100, as shown in FIG. 3A, of which the intermediate layer 330, is a partially elastic and partially fragile intermediate layer, the areas 700 left free by the mask to the rights of the elastic intermediate layer 332 are only etched up to the elastic intermediate layer 332 while the areas 710 left free by the mask to the rights of the areas of the intermediate layer 331 which are hard and fragile, the etching is carried out up to the support layer 500. Magnetic parts 600 are thus obtained, shown in FIG. 3B, which may have parts 610, 620 of different thicknesses.

An example of the implementation of the method for producing laminated nanocrystalline toroids is shown in FIG. 4 and in FIG. 5. A laminated strip 13 consisting of a stack of glued nanocrystalline laminated strips is placed on a support strip 15 and glued to this tape using a soluble glue. On the upper face of the laminated strip 13 is arranged a cover 14 comprising cutouts 17 which delimit toroids 18A, 18B, 18C and 18D of various sizes, these toroids 18A, 18B, 18C and 18D are connected by attachment points 19A, 19B, 19C and 19D to the remaining parts of the cover 14. This stack is sanded in order to be engraved. During sandblasting the parts of the strip 13 which are in line with the openings 17 are completely abraded until the sand reaches the support layer 15. After sandblasting the cover 14 is removed. There is thus obtained a cut laminated strip adhering to the support strip 15. The cutouts of the laminated strip define parts 16A, 16B, 16C and 16D which are toroids in the form of washers and which remain attached to a peripheral part of the laminated strip. via attachment points. The cut laminate strip 13 is then cleaned, optionally coated with a protective polymer and separated from the support strip 5. A cut laminated strip 13 'shown in FIG. 5 is thus obtained. The parts 16A, 16B, 16C and 16D are then separated from the laminated strip cut from the strip 13', optionally by sandblasting, and a plurality of toroids are thus obtained. which constitute parts for discrete magnetic electronic components. The toroids thus obtained can have very diverse dimensions which may range from a few millimeters in diameter or even a millimeter in diameter up to several millimeters in diameter, with thicknesses ranging from a few tens of microns to a few hundred microns, or even more depending on the number of layers of nanocrystalline strips that have been stacked to make the laminate strip. These toroids thus obtained can then be coated and then wound so as to manufacture passive magnetic electronic components, such as inductors, transformers, rotors or stators of micromotors, or even any other component of the magnetic type. In addition, the method makes it possible to manufacture toroids comprising an air gap. For this, it suffices to provide a sufficiently fine radial cut, for example of the order of 1/10 mm wide or less.

As indicated above, when the laminated strip is a heterogeneous laminated strip comprising an intermediate layer made of a totally or partially elastic material, magnetic parts are obtained which have areas of great thickness and areas of small thickness. These parts can have various shapes which correspond to particular applications that a person skilled in the art knows how to determine. As in the previous case, after sandblasting, the precut laminated strip is cleaned, then the various elementary parts are separated and they are conditioned so that they can be used subsequently as parts incorporated in electronic components. These components are, for example, inductors, transformers, filters, antennas, rotors or stators of micromotors for watches.

The method as just described makes it possible to manufacture discrete electronic components. But it also makes it possible to manufacture electronic components incorporated into printed circuits.

To produce magnetic electronic components incorporated in printed circuits, one can proceed in several ways. It is in particular possible to place the laminated strip consisting of stacked nanocrystalline strips on a support plate consisting on the one hand of a layer of polymer material capable of becoming one of the layers of a printed circuit, this polymer layer being coated on its lower face with a layer of copper which can be etched by chemical etching to form conductive elements as is done in a manner known per se in the manufacture of printed circuits. The laminated strip is glued to the support plate by 1¹ intermediary of an elastic protective glue so that the sandblasting which cuts the part in the laminated strip does not cut the support polymer plate. After cutting the laminated strip to form a piece of passive inductive electronic component, the assembly is cleaned but the piece obtained is not peeled off from the support plate. On the contrary, this part is left on the support plate. As shown in FIG. 7A, a plate 51 is obtained on which is bonded a piece of inductive electronic component 54 in the form of a torus. The plate 51 comprises a layer 52 of polymer material on which the piece of electronic component 54 is bonded, and a lower layer 53 of copper. Using an adhesive that is sufficiently fluid to fill all the cavities without leaving bubbles, is then glued on the upper face of the plate provided with its part 54, a second plate 55 consisting of a layer of polymer material 56 and an upper layer 57 of conductive material such as copper. The copper layers 53 and 57 are then etched by chemical etching so as to form conductors 58 disposed radially with respect to the torus 54 which is included between the two outer layers 51 and 55 of the printed circuit shown in FIG. 7B. The conductors 58 of the upper face and of the lower face are connected by conductive passages 59 made up of holes whose walls are coated with a conductive material, so as to form windings. A printed circuit is thus obtained comprising an inductor or an integrated transformer. The technique of manufacturing conductors is a technique known per se in the manufacture of printed circuits. It should be noted that the etching of the conductors in the copper layers can be done not after assembly of the plates constituting the printed circuit, but before this operation. The order in which these operations are performed is only a matter of manufacturing convenience.

In a particular embodiment, and in order to avoid excess thickness between the upper layer and the lower layer of the printed circuit, it is possible to proceed by depositing on the lower layer of the printed circuit a single nanocrystalline layer, then producing a plurality of intermediate layers made up of a polymer compatible with the manufacture of printed circuits on which there is a nanocrystalline layer which is etched by sandblasting, and a plurality of intermediate layers are stacked so that the tori of the intermediate layers are located opposite each other. Then the whole is covered with a layer of polymer material comprising a layer of copper, and the connections are made by chemical etching and the drilling of holes, the walls of which are coated with conductive material. You can also drill the holes first and coat their walls with a conductive material, then etch the connections.

One can also proceed by making a support plate a magnetic circuit such as a relatively large thickness of millimeters or one millimeter first support plate in a tenths arrange material recess around the on this polymer having torus, with a resin or on a torus having a few more, then layers in planned one which we will have the torus which will fit the interstices around the torus form to fill sufficiently fluid with bubbles, then cover the surface with a copper polymer material on which we can engrave

In this process of which to be cut may previously comprise circuits not to leave a layer layer for everything coated with one of the connections.

manufacture, the support layer was deposited the laminated strip intended for electronics which must be protected during the sandblasting operation. For this prior sandblasting, a protective layer made of an elastic material resistant to sandblasting is placed on the support layer.

By this process it is possible to manufacture printed circuits comprising magnetic circuits incorporated into the thickness of the printed circuit. This technique can also be electronic, which one inductive such as an inductor or that also incorporate circuits applied to the for example of can incorporate manufacturing cards to a circuit of smart cards, in magnetic transformer. We can magnetic which can serve as an antenna or any other type of magnetic circuit that a person skilled in the art will know how to determine.

It will be noted that the support plates made of polymer material can be composite plates made of a woven material impregnated with resin usually used in the manufacture of printed circuits.

The invention as just described is also applicable to the manufacture of passive electronic components made of materials other than nanocrystalline materials, provided that these materials are metallic materials which are in the form of thin, hard and thin strips. fragile, ie capable of being etched by sandblasting. These materials are, for example, materials such as certain iron-cobalt, iron-platinum, iron-silicon, iron-nickel alloys, certain alloys of the nickel-chromium type or certain molybdenum alloys or certain tungsten alloys. Those skilled in the art are familiar with these alloys.

The passive electronic components obtained by this method can also be electronic components of the capacitive type or of the resistive type. To obtain such components, it is necessary to make metallic connections to the faces by way of example, for it is sufficient to make a connection component on it is sufficient to add the parts obtained. At capacitive, it layer a metallic metallic, and connects them both to another layer of metallic layers by at least one insulating layer having matched dielectrics. To obtain resistive, it suffices to create two electrical connections on the same metal layer.

being separated from the properties a component

In the process as just described, a single sandblasting operation is provided, but to achieve certain geometries, or for productivity reasons, it may be useful to perform the cut by several successive sandblasting operations carried out. with different masks. A manufacturing process which comprises a plurality of successive sandblasting operations is also part of the invention.

Finally, the method can be applied to the cutting of parts from laminated strips comprising a single thin and fragile metal strip or a thin and fragile metal strip bonded to an elastic and sand-resistant polymer strip, which elastic polymer strip can be glued. on a laminate strip comprising one or more thin and brittle metal strips and optionally one or more layers of a hard and brittle adhesive material.