FR2770490A1 - TRAY FOR PREPARING AND PACKAGING UNIT PRODUCTS SUCH AS FOOD PRODUCTS AND METHOD AND DEVICE FOR FORMING SUCH A TRAY - Google Patents

Abstract

The subject of the invention is a tray (1) for preparing and packaging unitary products, such as, for example, food products of the tartlet type, characterized in that it is made from a metal blank (2) of low thickness and in that it comprises at least two rows of at least two cells (3) and a rolled peripheral edge for stiffening said plate (1). The invention also relates to a method and a shaping device by stamping such a plate.

Description

The subject of the present invention is a tray for preparing and

  packaging of unit products, such as raw food products to be cooked frozen or precooked fresh or frozen or cooked, such as tarts. The invention also relates to a method and

  a device for shaping such a tray of condi-

tction and cooking.

  Certain products such as for example food products such as tarts or appetizer bites are

  made from a paste deposited in a mold and covered

  green of a savory or sweet garnish or other element

  covered with another layer of dough.

  So far, several methods of preparation

  tion of this kind of products are commonly used, either the products are precooked and marketed fresh or frozen, or the products are cooked and marketed

fresh or frozen.

  In the case of precooked products, marketed fresh or frozen, these products are formed in a metal mold which allows precooking and the precooked products are removed from the mold and placed on a tray which

  includes housing intended to each receive a pro-

  product, then the products are frozen and packaged for

marketing.

  In the case of cooked products sold fresh or frozen, these products are also formed

  in a metal mold which allows cooking and pro-

  cooked duits are removed from the mold and placed on a tray which has housings intended to each receive a product.

  Generally the trays used up to pre-

  sent are obtained from a sheet of plastic material

  that is thermoformed to make the housings.

  Before consumption of these products, they are removed from the tray, then placed on a baking sheet

  and reheated to the desired temperature.

  Thus, the manufacture of this kind of product requires in all cases a multitude of manipulation operations during its manufacture and at the consumer.

  with the risks of product degradation that these differences

  your manipulations can lead.

  The object of the invention is to avoid these inconveniences.

  by offering a tray that can be used from the manufacturing

  until marketing, cooking or reheating

  fage of these products to the consumer and which therefore allows

  preparation, cooking, freezing of single products

  keep quiet as well as the marketing and reheating of

these products.

  The subject of the invention is therefore a pre-

  trim and packaging of unit products, such as raw frozen or precooked fresh or frozen or cooked food products, characterized in that it is produced from a thin metal blank and in that has at least two rows of

  at least two cells and a rolled peripheral edge of stiffness

fication of said tray.

  According to other characteristics of the invention:

  - each cell has a frustoconical or he-

  misherical, - the lateral wall of each cell is smooth or grooved,

  - the tray includes, between the rows of al-

  voles, protruding studs extending perpendicularly

  to the metal blank and directed alternately in a di-

opposite rection,

  - each stud has a frustoconical or hemi-

spherical,

  - The bottom of the cells has at least one ori-

  fice. The invention also relates to a method of

  shaping of a preparation and packaging tray

  ment of unitary products, characterized in that: - a blank is cut from a thin metal sheet, - the metallic blank is tightened to a pressure Pl

  over its entire surface outside the portions of the blank intended

  born to form the cells, - the metal blank is formed by stamping at least two rows of at least two cells, - the metal blank is clamped at a pressure P2 greater than Pl plus the drawing force and the fall is carried out from the peripheral edge of said metal blank, - and a pressure P3 less than P2 is exerted on the fallen edge to roll the fallen edge and form an edge

  rolled device for stiffening said plate.

  According to other characteristics of the invention: -

  - Simultaneously with the formation of the cells, there are formed between the rows of said cells protruding studs extending perpendicular to the metal blank and directed in the same direction as these cells, after the falling of the peripheral edge, one forms between the rows of said cells protruding studs extending perpendicular to the metal blank and directed in a direction opposite to that of the cells, the

  opposite direction studs being alternated with respect to each other

  port to others, - at least one orifice is made in the bottom of said cells simultaneously with the formation of pads

  direction opposite to that of the alveoli.

  The invention also relates to a device for

  shaping of a preparation and packaging tray

  ment of unitary products, characterized in that it comprises

  takes: - a fixed lower block, - an upper block movable vertically, - means for guiding the upper block with respect to the lower block, - means for cutting a blank from a thin metal sheet, - means for clamping of the metal blank over its entire surface outside the portions of the blank intended to form the cells, - means for forming, by stamping, the metal blank of at least two rows of at least two cells, - and means of falling off the peripheral edge

  of the metal blank and rolling of this fallen edge to form

  sea a rolled edge of stiffening of said plate.

  According to other features of the invention: - the device comprises training means

  by stamping projecting studs extending perpendicularly

  metal blanking between rows of cells

  and directed alternately in an opposite direction, -

  - the device comprises drilling means

from the bottom of the alveoli.

  The characteristics and advantages of the invention

  will appear during the description which follows,

  born as an example and made with reference to the drawings an-

  attached, on which: - Fig. 1 is a schematic top view of a preparation and packaging tray in accordance with the invention, - FIG. 2 is a schematic side view of the plate, - FIG. 3 is a schematic side view of two superimposed plates, - FIG. 4 is a schematic view in cross section and in the open position of a device for shaping the plate according to the invention, - FIG. 5 is a detail view on a larger scale showing the means for forming the cells and the means for piercing the bottom of said cells, - FIG. 6 is a schematic view in longitudinal section of the device showing the means for forming the studs, - FIG. 7 is a view in cross section and in the closed position of the device, - Figs. 8 to 13 are schematic views in

  cross section showing the different stages of the process

  die for shaping the plate according to the invention. In Figs. 1 and 2 there is shown a plate

  1 of preparation and packaging of unitary products

  res, such as food products of the type

  tartlets or appetizer bites and generally pro-

  raw foodstuffs to cook frozen or precooked fresh

or frozen or cooked.

  The tray 1 is made from a metall

  metal sheet 2 of small thickness and comprises at least two

  rows A, B ... of at least two cells 3 and a perimeter

  spherical rolled 4 for stiffening said plate 1.

  The metal blank 2 is for example made of an alloy

  aluminum and its thickness is between 80 to 120pm.

  In the embodiment shown on the

  Figures, the tray 1 has three rows A, B, C of qua-

be cells 3 each.

  The cells 3 have a frustoconical shape and the side wall of each cell 3 is provided with grooves 3a. Alternatively, the side wall of each

alveolus 3 can be smooth.

  According to another variant, the alveoli 3 can have a hemispherical shape and the side wall of each

  alveolus 3 can be smooth or provided with grooves.

  According to a preferred embodiment shown

  felt in Figs. 1 to 3, the tray 1 comprises, between the

  rows A, B, C of the cells 3, the pads 5a and 5b extend

  dant perpendicular to the metal blank 2 and directed al-

  ternatively in an opposite direction.

  Thus, the pads 5a are directed in the same direction as the cells 3 and the pads 5b are directed

  in a direction opposite to that of the alveoli 3, as re-

shown in Fig. 2.

  Furthermore, the pads 5a and 5b can have

  a frustoconical or hemispherical shape.

  By way of example, each cell 3 has a diameter

  be of the order of 50mm and a depth of between 10 and 11mm and each stud 5a and 5b has a height of the order of 6mm. Thus, when the trays 1 are placed the

  on top of each other as shown in Fig. 3, such

  lastly that the studs 5a of the lower plate 1 directed towards

  the top are opposite the pads 5b of the top 1 plate

  laughing. The height of these studs 5a and 5b is such that the bottom of the cells 3 of the upper plate 1 does not come into

  contact with the product deposited in the cells 3 of the plate

lower level.

  In the case of food products, such as for example tarts or appetizer bites, the dough is deposited on the bottom of the cells 3 and is spread out to

  that it follows the shape of these cells 3.

  Then a savory or sweet garnish or another

  the element covered with another layer of paste is deposited

  on the dough spread in each cell 3.

  After cooking or freezing, several trays 1 are placed one on top of the other and introduced into a

  packaging for distribution and marketing.

  If products need to be cooked or reheated

  before consumption, the tray also serves as a

port for this reheating.

  Thus, the tray 1 according to the invention is used

  sand from the preparation of the products to their con-

  summation and this for all manufacturing methods

some products.

  To avoid condensation on the bottom of the cells 3 when cooking or reheating the

  products, the bottom of the cells 3 comprises at least one ori-

  fice 6, as shown in fig. 1.

  Referring now to Figs. 4 to 7, we

  will describe the device for shaping the plate 1.

  - an upper block 11 movable vertically by means of a slide 12 of the press, - means 20 for guiding the upper block 11 relative to the lower block 10, - means 30 for cutting a blank 2 in a thin metal sheet, - means 40 for clamping the metal blank 2

  over its entire surface outside the portions of the blank intended

  born to form the cells 3, - means 50 for forming by stamping the metal blank of at. at least two rows A, B ... of at least two cells 3, - and means for dropping the peripheral edge of the metal blank 2 and rolling this fallen edge to

  form the rolled edge 4 of stiffening of the plate 1.

  In the embodiment shown in Figs. 4 to 7, the device also comprises means 70 for forming studs 5a and 5b projecting projecting extending perpendicular to the metal blank 2 between the rows of the cells 3 and directed alternately in an opposite direction and means 80 for piercing the background

alveoli 3.

  In what follows, the device for shaping the plate 1 will be described for the production of a plate 1 of substantially rectangular shape with rounded corners,

as shown in Fig. 1.

  Thus, the means 30 for cutting the metal blank

  2 and the means of tightening this metal blank

  that 2 have a general rectangular shape complementary to

tray 1.

  As shown in Fig.4, the means 20 for guiding the upper block 11 relative to the lower block are formed by sleeves 21 preferably four in number arranged at each corner of the lower block 10 and by

  columns 22 integral with the upper block 11 and preferably

  four in number, designed to slide vertically-

each in a sleeve 21.

  The means 30 for cutting the metal blank 2 from a thin metal sheet comprise a lower cutting ring 31, fixed and supported by the

  lower block 10 by means of columns 31a.

  This lower cutting ring 31 has a central cavity 33 of shape complementary to the contour of the

tray 1.

  The means 30 for cutting the metal blank

  2 also include a top cutting punch 34 so-

  upper block 11 vertically movable and

  whose external contour is of shape complementary to the

  internal revolution of the lower cutting ring 31.

  The upper cutting punch 34 is intended to penetrate inside the cavity 33 of the cutting ring.

  lower 31 and, as shown in FIG. 4, the edge in-

  dull of the lower cutting ring 31 and the outer edge of the upper cutting punch 34 are bevelled so as to

  form complementary cutting edges.

  The means 40 for clamping the metal blank 2 comprise a lower peripheral blank holder 41 disposed

  inside the cavity 33 of the cutting ring 31 and

  can be placed vertically by means of actuators 32

  supported by the lower block 10.

  The peripheral blank holder. lower 41 com-

  carries an external shoulder 41a which cooperates with the organs

actuation 32.

  The means 40 for clamping the metal blank 2 also comprise a lower central clamp 42 housed at

  the interior of the lower peripheral hold-down 41 and

  can be placed vertically independently of the peripheral blank holder

  lower risk 41, as will be seen later.

  In the rest position as shown in Fig. 4,

  the lower central blank holder 42 is supported on a bu

  tee 41b secured to the lower peripheral blank holder 41 and which makes it possible to bring said lower central blank holder 42

  in its initial position after the formation of the plate 1.

  The means 40 for clamping the metal blank 2 are also formed by the upper cutting punch 34 integral with the upper block 11 and intended to cooperate with the lower peripheral blank holder 41 and by a matrix 43 housed inside the cutting punch higher 34 and des-

  keen to cooperate with the lower central blank holder 42.

  As shown in FIG. 4, the matrix 43 is supported by the upper block 11 by means of at least one elastic compression member 44 interposed between the upper block 11 and a sole 43a below which

the matrix 43 is fixed.

  The actuating means 32 are formed by at least two double-acting cylinders which make it possible to tighten the

  metal blank 2 at two different pressures through the

  median of the lower peripheral hold-down 41, of the hold-down

  lower central blank 42, of the upper cutting punch 34

and matrix 43.

  The lower central blank holder 42 has at

  at least two rows of at least two housings 44 and the ma-

  also includes at least two rows of at least

  two housings 45 arranged opposite the housings 44.

  The number of housings 44 and 45 housed respec-

  tively in the lower central blank holder 42 and in the matrix 45 corresponds to the number of cells 3 to be formed in

  the metal blank 2 to obtain the tray 1.

  Thus, the lower central blank clamp 42 includes

  carries three rows of four housings 44 and the matrix 43

  has three rows of four housings 45.

  The means 50 for forming the cells 3 by

  stamping of the metal blank 2 are arranged inside

  of housing 44 and 45 provided respectively in the

  lower central blank 42 and in the matrix 43.

  As shown in Figs. 4 and 5, these means 50 for forming the cells 3 comprise, on the one hand, fixed punches 51 and, on the other hand, rings 55 forming an imprint 56 of shape complementary to the punch

51 correspondent.

  Referring to Fig. 5, we will describe the

  layout of a punch 51, the layout of the other punches-

Lessons 51 being identical.

  The punch 51 is mounted on a support 52 which is itself disposed inside a housing 44 formed

  in the lower central blank holder 42.

  The support 52 is fixed and integral with the block

  lower 10 by means of support soles 53.

  The punch 51 is connected to the soles 53 by means of a fixing member 54 constituted by

example by a screw.

  The punch 51 is therefore interchangeable.

  Likewise, each ring 55 is mounted in the lo-

  corresponding position 45 of the matrix 43 by means of at least one fixing member 57 constituted for example

by a screw.

  Thus, each ring 55 is interchangeable.

  The bottom of each housing 45 of the matrix 43 has at least one orifice 58 for venting

fingerprint 56.

  The punches 51 and the imprints 56 of the rings have a shape corresponding to the shape of the cells 3 to

  obtain on the plate 1 and for example a truncated form

than or hemispherical.

  Furthermore, the side wall of the punches 51 and the internal wall of the rings 55 are smooth or have

grooves.

  As will be seen later during the

  description of the different stages of operation of the device

  positive, the means for falling off the peripheral edge of the metal blank 2 are formed by the upper cutting punch 34 which, during its descent, makes it possible to fold the peripheral edge of the metal blank 2 onto the external face of the

lower central blank holder 42.

  The means of rolling the fallen edge are formed

  by the lower peripheral clamp 41 and by the pin

  upper cutting lesson 34 which, during their movement,

  allow to roll the fallen edge.

  To this end, the lower peripheral blank holder

  laughter 41 has on its internal edge a groove 48 and the upper cutting punch 34 has on its internal edge

  a groove 49 disposed opposite the groove 48.

  Referring now to FIG. 6, a description will be given of means 70 for forming by stamping

studs 5a and 5b projecting.

  As shown in this figure, the means for forming the studs 5a projecting in the same direction as that of the cells 3 comprise vertical rods 71 fixed and integral with the lower block 10 via

soles 53.

  In the embodiment shown, the vertical rods 71 are three in number to form

  three studs 5a projecting in the same direction as the

veils 3.

  Each rod 71 is arranged in a bore 72

  formed in the lower central blank holder 42 between the lo-

  44 receiving punches 51.

  The means for forming the protruding studs 5a

  also include recesses 73 formed on the underside

  of the matrix 43 between the receptacles 45 for receiving

  tion of the rings 55 and opposite the rods 71.

* The number of recesses 73 is equal to the number of rods 71 and in the embodiment shown on the

  figures, the number of recesses 73 is three.

  The means for forming the studs 5b projecting in the direction opposite to that of the cells 3 comprise

  vertical rods 74 integral with the upper block 11.

  The number of rods 74 is equal to the number of

  pads 5b to be produced on the metal blank 2 and in the example

  full of realization the number of vertical rods 74 is

three.

  Each vertical rod 74 is disposed in a bore 75 formed in the matrix 43 between the housings 45

receiving rings 55.

  The means for forming the pads 5b also include recesses 76 formed on the upper face of the lower central blank holder 42 between the housings 44 of

  receiving the punches 51 and facing said rods 74.

  The number of recesses 76 is equal to the number of rods 74 and in the embodiment shown on the

  figures, the number of recesses 76 is three.

  Thus, the rods 71 and the recesses 73 allow

  attempt to form in the metal blank 2 three studs 5a projecting in the same direction as that of the cells 3 and the rods 74 and the recesses 76 allow three studs 5b projecting in a direction opposite to that

  said cells 3 and alternating with the pads 5a.

  Referring now to Figs. 4 and 5, we

  will describe the means 80 for piercing the bottom of the cells 3.

  These drilling means 80 comprise at least one vertical point 81 disposed inside each

hallmark 51.

  The number of vertical points 81 is equal to

  number of holes 6 to be made in the bottom of each al-

  vole 3 and, in the embodiment shown in the figures, the number of vertical points 80 is three.

  The vertical points 81 arranged inside

  of each punch 51 are integral with a piston 82

  housed in the support 52 of the corresponding punch 51.

  Each piston 82 forms with the upper sole

  lower 53 an internal chamber 83 connected to a conduit 84 for admission of pressurized fluid formed in the soles 53.

  Thus, under the action of the pressurized fluid ad-

  placed in the internal chamber 83 through the conduit 84, each

  piston 82 and the associated vertical tips 81 are displaced

  vertically strung between a retracted position

  port with the punch 51, as shown in FIG. 4 and a po-

  projecting position relative to said punch 51, as shown

felt in FIG. 6.

  The tips 81 and the pistons 82 associated with each punch 51 are returned to the retracted position by a

  elastic member 85 constituted for example by a spring.

  Finally, the device comprises a stripper 90 which is formed by a frame disposed around the upper cutting punch 34 and which has the role of maintaining the

  metallic foil when raising the upper part

device.

  For this, the stripper 90 is mounted moved

  ble vertically with respect to the upper block 11.

  This stripper 90 is connected to the upper block 11 by guide rods 91 each slidably mounted in a support 92 fixed on the underside of the upper block 11. Referring now to Figs. 8 to 13, we

  will describe the different stages of operation of the device

  positive for the shaping of the plate 1 in accordance with the

  vention. These figures are schematic sectional views passing through the punches 51 and through the vertical rods 71

  and 74 in order to facilitate the understanding of the successive steps

sives.

  First of all, the upper block 11 as well as the various elements which it supports are in the high position as shown in FIG. 8 and a portion of a leaf

  metallic 2a of small thickness, as for example in al-

  aluminum bonding, is introduced into the device.

  During a first step shown in FIG. 9, the upper block 11 guided by the columns 22 which slide in the sleeves 21 progressively descends so that the portion of metal sheet 2a is clamped, on the one hand, between the upper cutting punch 34 and the peripheral blank holder lower 41 and, on the other hand,

  between the matrix 43 and the lower central blank holder 42.

  The actuating members 32 apply to the portion of metal sheet 2a, via the

  lower peripheral hold-down 41 and central hold-down

  lower tral 42, a pressure Pl which is less than the pressure P2 exerted by the elastic members 44 on the

matrix 43.

  The upper block 11 as well as the upper cutting punch 34 and the die 43 continue to descend gradually, which also causes the descent of the

  lower peripheral hold-down 41 and central hold-down

  lower tral 42, while the lower cutting ring

31 is fixed.

  During this gradual descent, the point-

  upper cutting section 34 enters the cavity 33 inside

  lower cutting ring 31 which has the ef-

  fet to cut a metal blank 2 in the metal sheet-

2a.

  Still during this gradual descent, the rings 55 penetrate the punches 51 in such a way

  that the metal constituting the metal blank 2 is progressing

  and conforms to the external shape of the punches 51, thus

as shown in Fig. 10.

  The air between the external face of the alveoli 3 and the

  bottom of the imprints 56 is discharged through the orifices 58.

  In addition, the free ends of the rods 71 which are fixed, penetrate into the recesses 73 in order to form

  the pads 5a extending in the same direction as the al-

veils 3.

  Thus, during the step shown in FIG. 10, the metal blank 2 is cut and the cells 3 and

  the pads 5a are formed simultaneously.

  During the next step shown in the

  Fig. 11, the upper block 11 continues to descend progressively

  While the lower central blank holder 42, the

  punches 51 and die 43 remain in the same position.

  The descent of the upper block 11 causes, on the one hand, the compression of the elastic members 44 and, on the other hand, the descent of the lower peripheral blank clamp 41 by the upper cutting punch 34 so that the peripheral edge of the metal blank 2 is gradually

  folded down, by means of said upper cutting punch

  rieur 34, on the outside of the lower central hold-down

laughing 42.

  As soon as the peripheral edge of the metal blank 2 is completely folded down on the external face of the lower central blank holder 42, as shown in FIG. 12, the

  pressurized fluid is admitted into the rooms 83 provo-

  as the rise of the pistons 82 and the tips 81 so that the free ends of these tips 81 protrude from the upper face of the punches 51 and perforate the bottom of the cells 3. In addition, during this step during

  which the upper cutting punch 34 descends progressively

  In order to drop the peripheral edge of the metal blank 2, the rods 74 descend so that the free ends of these rods 74 progressively penetrate into the recesses 76 so as to form the studs 5b extending in

  a direction opposite to that of the cells 3.

  During these previous steps, the metal blank

  that 2 is clamped at the pressure P2 greater than Pl plus the eff-

  high drawing which corresponds to the effort required

  to stamp and bend the metal of this metal blank

metallic.

  Then, a pressure P3 added to the pressure

  sion Pl is applied by the intermediary of the

  operation 32 on the lower peripheral blank holder 41 in such a way that the resulting pressure applied to this lower peripheral blank holder 41 is greater than the

  pressure exerted by the elastic members 44.

  Due to this pressure on the clamp

  lower peripheral blank 41, the latter goes up progress-

  by causing the upper cutting punch to rise

laughing 34 and upper block 11.

  During this ascent, the fallen edge of the metal blank 2 is progressively rolled in the grooves 48 and 49 respectively of the lower peripheral clamp 41 and of the upper cutting punch 34, as shown in FIG. 13. Then the whole of the upper part of the

  device rises while stripper 90 remains applied

  against the lower cutting ring 31 so as to hand-

  hold the rest of the metal foil 2a and strip

this metallic sheet.

  The shaping device according to the invention therefore makes it possible to produce, by stamping in a single pass, a plate for preparing and packaging products.

  single from a thin metal blank ,.

  this tray can be used on the whole chain of fa-

  brication as well as for marketing and reheating

product fage.

Claims (25)

  1. Preparation and packaging tray   unitary products, such as for example   tartlet type cheeses, characterized in that it is produced from a thin metal blank (2) and in that it comprises at least two rows (A, B ...) of at least at least two cells (3) and a rolled peripheral edge   (4) for stiffening said plate (1).   2. Tray according to claim 1, characterized   in that each cell (3) has a frustoconical or he-   misperipheral. 3. Tray according to claim 1, characterized in that the side wall of each cell (3) is smooth or fluted.   4. Tray according to claim 1, characterized in that it comprises, between the rows of the cells (3), studs (5a, 5b) projecting extending perpendicular to the metal blank (2) and directed alternately in a opposite direction.   5. Tray according to claim 1, characterized in that each stud (5a, 5b) has a frustoconical or hemispherical shape.   6. Tray according to claim 1 or 2, charac-   terized in that the bottom of the cells (3) comprises at least an orifice (6).   7. A method of shaping a tray (1) for preparation and packaging according to any one of   previous claims, characterized in that:   - a blank (2) is cut from a metal sheet -   thin layer (2a), - the metal blank (2) is tightened to a pressure Pl over its entire surface outside the portions of the blank (2) intended to form the cells (3), - the blank is formed by stamping metal (2) at least two rows (A, B ...) of at least two cells (3), - the metal blank (2) is tightened to a pressure   P2 greater than Pi plus the stamping effort and   reads the falling off of the peripheral edge of said metal blank (2), - and a pressure P3 less than P2 is exerted on the fallen edge to roll the fallen edge and form an edge   rolled device (4) for stiffening said plate (1).   8. Method according to claim 7, characterized in that simultaneously with the formation of the cells (3), there are formed between the rows of said cells (3) studs (5a)   protruding and extending perpendicular to the metal blank-   lique (2) and directed in the same direction as that of alveoli (3).   9. Method according to claim 7, characterized   in that after the peripheral edge has fallen,   be the rows of said cells (3) of the protruding studs (5b) extending perpendicular to the metal blank   (2) and directed in a direction opposite to that of the alveo-   the (3), the pads (5a, 5b) of opposite direction being al-   tarnished with each other.   10. The method of claims 7 and 9, ca-   characterized in that simultaneously with the formation of the pads (5b) in the opposite direction to that of the cells, one realizes   at least one orifice (6) in the bottom of said cells (3).   11. Device for shaping a tray (1) for preparation and packaging according to any one   of claims 1 to 6, characterized in that it comprises: - a fixed lower block (10),   - an upper block (11) movable vertically -   ment, - means (20) for guiding the upper block (11) relative to the lower block (10), - means (30) for cutting a blank (2) in a thin metal sheet (2a) , - means (40) for clamping the metal blank   (2) over its entire surface outside the portions of the blank   tine to form the cells (3), - means (50) for forming by stamping the metal blank (2) of at least two rows (A, B ...) of at least two cells (3), - and means for falling off the peripheral edge of the metal blank (2) and for rolling this fallen edge to form a rolled edge (4) for stiffening said plate (1).   12. Device according to claim 11, charac-   terized in that it comprises means (70) for training by   stamping of studs (5a, 5b) projecting extending perpetually   specifically to the metal blank (2) between the rows of the cells (3) and directed alternately in an opposite direction.   13. Device according to claim 11, charac-   terized in that it comprises means (80) for piercing the bottom of the cells (3).   14. Device according to claim 11, charac-   terized in that the means (30) for cutting the metal blank-   lique (2) comprise, on the one hand, a lower cutting ring   fixed (31) and having a central cavity (33) of shape complementary to the contour of the plate (1) and, on the other hand, an upper cutting punch (34) integral with the upper block (11) movable vertically and the external contour is of complementary shape to the internal contour of the lower cutting ring (31).   15. Device according to claims 11 and   14, characterized in that the means (40) for clamping the blank   metallic (2) comprise, on the one hand, a peri-blank holder   lower ball (41) arranged inside the cavity   (33) of the lower cutting ring (31) and displaceable   tically by means of actuating members (32) supported   by the lower block (10) and a lower central hold-down   laughter (42) housed inside the peripheral blank holder   lower (41) and vertically movable independently of said lower peripheral blank holder (41) and, on the other hand, the upper cutting punch (34) integral with the upper block (11) and intended to cooperate with said lower blank holder ( 41) and a die (43) housed inside the upper cutting punch (34) and intended to cooperate with the lower central blank holder (42), said die (43) being supported by the upper block (11) by means of at least one elastic compression member (44).   16. Device according to claim 15, charac-   characterized in that the actuating members (32) are formed   by at least two double-acting cylinders.   17. Device according to claim 11 or 15, characterized in that the lower central blank holder (42) and the matrix (43) comprise at least two rows of at least   at least two housings (44, 45) for the training means (50) tion of said cells (3).   18. Device according to claim 11 or 17, -   characterized in that the means (50) for forming said cells (3) comprise, on the one hand, at least two rows of at least two fixed punches (51), each mounted in a support (52) integral with the lower block (10) and disposed in a housing (44) of the lower central blank holder (42)   and, on the other hand, at least two rows of at least two bas-   gues (55) each arranged in a housing (45) of the ma-   trice (43) and forming an imprint (56) of complementary shape   keep silent with the corresponding punch (51).   19. Device according to claim 18, charac-   terized in that the punches (51) and the imprints (56)   rings (55) have a frustoconical or hemispherical shape.   20. Device according to claim 18 or 19, characterized in that the side wall of the punches (51) and the internal wall of the rings (55) are smooth or have grooves.   21. Device according to any one of the res-   dications 18 to 20, characterized in that the punches (51)   and the rings (55) are interchangeable.   22. Device according to claim 11 or 15,   characterized in that the means for falling off the peripheral edge   risk of the metal blank (2) are formed by the upper cutting punch (34) and the rolling means of this fallen edge are formed by the lower peripheral blank holder (41) and said upper cutting punch (34) which comprise   each on its internal edge a groove (48,49).   23. Device according to any one of the res-   dications 11 to 22, characterized in that the means (70) for forming the studs (5a) projecting in the same direction as that of the cells (3) comprise at least one fixed vertical rod (71), integral with the lower block ( 10) and   disposed in a bore (72) formed in the central blank holder   lower tral (42) between the housings (44) for receiving the punches (51) and at least one recess (73) formed on the underside of the die (43) between the housings (45) for receiving the rings (55) and opposite to said rod (71).   24. Device according to any one of the res-   dications 11 to 21, characterized in that the means (70) for   formation of the studs (5b) projecting in the opposite direction   sée to that of the cells (3) comprise at least one vertical rod (74), integral with the upper block (11) and disposed in a bore (75) formed in the matrix (43) between the housings (45) for receiving the rings (55) and at least one recess (76) formed on the upper face of the lower central blank holder (42) between the receiving housings (44)   punches (51) and opposite said rod (74).   25. Device according to any one of the res-   dications 11 to 21, characterized in that the means (80) for piercing the bottom of the cells (3) comprise at least one   vertical point (81) disposed inside each point   lesson (51) and movable under the action of a piston (82) housed in the support (52) of the punch (51) corresponding between a   retracted position with respect to the punch (51) and a position   tion projecting from said punch (51), said   tip (81) being returned to the retracted position by an or- elastic gane (85)