RU2458616C2 - Kitchen utensils with improved bearing surface and method of its manufacture - Google Patents

Abstract

FIELD: personal use articles.

SUBSTANCE: invention relates to kitchen utensils. The kitchen utensils comprises a metal casing (1b), including the bottom coupled with an insert (1a) made of a harder metal than the metal casing, and which is usually fastened with it through the perforations or teeth, providing a rigid connection (231, 310). Around the perforated or toothed area (231) of the insertion (1a) there is a zone (25) of a continuously solid slightly protrusive peripheral support surface in the form of a crown in the said harder metal. The insertion is rigidly fixed in the form of a flat plate or a capsule. Also a method of manufacturing of kitchen utensils is claimed.

EFFECT: group of inventions enables to improve the thermal and mechanical properties of the utensils bottom in the process of induction heating.

18 cl, 12 dwg

Description

The present invention relates to cookware, the bottom of which has at least an additional metal insert covering at least partially the bottom of this bottom. Crockery, including its bottom, is usually made of ductile metal such as aluminum. The invention also relates to a method for manufacturing cookware and / or its bottom with an additional metal insert.

As used herein, the term “metal” refers to metal and a metal alloy.

From EP-A-0960667, cookware is known comprising:

- a metal casing locally bounding the lower part of the bottom of the pan, where said casing contains a toothed zone in a transverse section of the bottom,

- and at least one additional metal insert, doubled from the bottom with said metal casing, at least locally in the region of its bottom, while this insert has an open metal side made of a harder metal than the metal of the metal casing, and in section, at least one perforated or toothed zone rigidly fixed to the toothed zone of said metal body.

The "teeth" are made by bending or stamping a plate with many flat areas forming a supporting surface from the bottom of the bottom when the dishes are placed on the base.

These “teeth” or flat pads in the form of holes made in the insert are usually arranged in concentric circles.

If the insert is perforated, the holes are filled with ductile metal of the metal body.

Various flaws noted:

- the insert / “plastic” bottom connection is performed mainly by fastening or rolling (like a stone inserted in a frame),

- such fastening is fragile; on the bottom side the “plastic” bottom that connects to the insert is pre-stamped,

- holes may not be completely filled,

- if a more plastic filling material protrudes beyond the lower level of the insert to be attached, then contact, for example, with a glass-ceramic plate, runs the risk of leaving strips on this plate, especially if the more plastic material is aluminum.

The aim of the present invention is to eliminate all or part of these disadvantages. Another goal is to eliminate defects associated with the method of manufacture or use, or foreign inclusions that appear in the joints of the ductile metal / insert, which can also cause scratches on a brittle surface and / or defects in the supporting surface.

Indeed, the disadvantages of the supporting surface can lead to instability of the dishes during its installation and / or the appearance of a plaque of ductile metal on the base.

However, in the case when the insert made of solid metal allows induction heating of dishes from the corresponding generator, then the larger the number of holes in the insert, the more the efficiency of induction heating changes.

In order to at least eliminate all or part of these shortcomings and improve the situation, the invention proposes, in accordance with its characteristic, that around the perforated or toothed zone of the insert attached to the bottom there is a zone protruding below its level, limiting the peripheral completely continuous a corona-shaped abutment surface in said harder metal.

Thus, it is preferably contemplated that this area of the abutment surface covers a portion of the bottom of the body around said rigid joints and has a lower surface that projects, in whole or in part, at least slightly, below the lowest boundary of said perforated or notched area and / or notched area mentioned metal body. Thus, in this place the supporting annular surface of the dishes is concentrated.

It can be proposed that said “peripheral support zone” has a width (hereinafter referred to as L) exceeding the smallest distance (d1) separating two consecutive teeth located in a direction connecting the center of the bottom and the peripheral edge of the latter.

Two manufacturing methods are also proposed below. They are applicable for preparing said dishes, at least in the case where the attached insert contains perforations. In addition or alternatively, these methods make it possible to produce a bottom, in particular for cookware.

After manufacturing such a reinforced stable and slightly aggressive bottom, you can make the rest of the dishes. To do this, it is proposed to resort to deformation under pressure of the initial block of ductile metal to obtain the side wall of the dishes.

The invention is further explained in the following description, which is not restrictive, with the embodiments presented below.

By implementing this invention, the improved thermal and mechanical properties of the bottom of the cookware are also obtained during the induction heating or cooking at high temperature of one or more connected shells, such as anti-adhesive, usually provided on the inner surface, in particular the bottom (problems of peeling, swelling), as well as in the process of repeated thermal shocks.

The invention is illustrated by drawings, in which

- FIG. 1 is a schematic diagram of a cookware according to a cross section of a bottom according to a first embodiment of the invention,

- FIG. 2 and 3 depict on a larger scale the same view, respectively, with the second and third embodiments of the cookware according to the invention; details, zones, means are indicated by the same positions as in FIG. 1, but are provided with signs (') and (' '), respectively

- FIG. 4 shows a variant of the bottom, at least in the toothed part, in the same section,

- FIG. 5a, 5b, 5c and 6a, 6b, 6c depict the steps of the two manufacturing processes used in the framework of the invention,

- FIG. 7 is a bottom view of FIG. 2

- FIG. 8 depicts in fact the arch of the bottom of the pan of FIG. one.

As used herein, “cookware” is any kitchen item, typically containing at least one handle and one body (hollow), for placing a product or preparing food by heating or frying. The bottom of the body is a sensitive object, as it is most susceptible to heat from a given heat source. This applies to pans, pots, etc.

In FIG. 1-3, the kitchen utensils 1, 1 ', 1' 'comprise a solid metal part 1a, 1a', 1a '' and a more ductile metal part 1b, 1b ', 1b' '. These two parts are connected to the dishes in order to form an effective reinforced bottom.

Part 1a, 1a ', 1a' 'can be made of stainless steel, part 1b, 1b', 1b '' - of aluminum.

Part 1b, 1b ', 1b' 'is preferably monoblock, as shown in the drawing, and contains a transverse wall of the bottom 21, 21', 21 '', from which the side wall 3, 3 ', 3' 'rises. It forms a hollow body.

At least one part of the bottom wall is made paired from below with a part of solid metal 1a, 1a ', 1a' ', which is a perforated insert of the bottom.

In FIG. 1, the insert has a central zone 23 surrounded by a supporting zone 25, by which the cookware 1 can rest on the base. The support zone 25 is continuously continuous (i.e., in this case, without holes) and in the shape of a crown.

The central zone 23 contains through holes 230, densely filled for joining the bottom wall 21 with plastic metal. These holes are evenly or unevenly divided into one or more zones, usually along several radii, which can be concentric and begin near the center of the plate 1a (see FIG. 2 and 3).

Thus, the insert 1a that forms the lower surface 11a is, as shown in FIG. 1, in section, at least one perforated zone 231 fastened by rigid joints with a gear zone 210 of a metal housing 1b.

Around all or part of zone 210 is a continuously continuous zone 211, covered or paired from below by the peripheral zone of the supporting surface 25.

In order for the support of the cookware 1 to concentrate on its base to the area of the supporting surface 25, the latter has a lower surface that is completely or partially made with at least a small protrusion by the amount of (d) relative to the lowest border 1 of zones 231 and 210. Thus, it should be understood that the drawings of the bottoms of the dishes of FIG. 1, 2 and 3 are shown on a larger scale and, in fact, as shown in pos. 11a in FIG. 1 are not flat below, but are curved or concave to provide a lower position of the support zone 25, as shown in FIG. 8, where the image of the position of the curve is enlarged.

If, for example, the holes 230 were completely filled with ductile metal of the wall of the bottom 21, then the value of the safety value (d) would not be specified with respect to the only lower boundary of the perforated zone 231.

In FIG. 8, 25a shows a straight line that connects the center of the bottom and the peripheral edge 27 of the latter.

In accordance with this straight line (that is, in accordance with a section perpendicular to the bottom and including this straight line), the peripheral support zone 25 has a width (L) exceeding the smallest distance (d1) separating two adjacent teeth 210a, 210b of the area 210.

Preferably, this width (L) will be greater than or equal to the width (L ') between respectively the inner 12 and outer 11 boundaries of the two outer (210c') and inner (210a ') teeth of the metal case, respectively, separated by at least a third tooth ( 210b '); or typically be on the order of 7 mm, see FIG. 2.

Thus, a good compromise of the support / mount / induction efficiency is achieved.

To ensure the magnitude of the protrusion (d) and, thus, the placement in the lower part relative to it of at least part of said lower surface 11a of the bottom, in this case the peripheral zone of the supporting part 25, the perforated zone 231 and in this case the entire surface of the bottom from center to the support zone 25 has a curved inner surface 100A, concave down (and coinciding in this case with 1).

For better fastening of the parts 1a, 1a ', 1a' '' and 1b, 1b ', 1b' 'to each other, the bottom-connected insert is also preferably embedded in a metal housing in the area 29, 29', 29 '', located with the outer extreme sides of the support zone 25 and said inserts located closer to the center, such as 210, 231 in FIG. 1 and 210 ″, 231 ″ in FIG. 3.

This zone of additional inserts, such as 29, is preferably located outside the periphery of the support zone, such as 25, and the surface, such as 211, of the housing that overlaps it.

In FIG. 1, zone 29 is attached to the housing 1b by means of a fastening part 31, which is located on the periphery of the zone of the supporting surface 25 as a single part with an insert 1a and which forms a flange at the edge of this zone 25.

This flange 31 surrounds the region 35 from the outside, to which it is connected by a reinforcing bend 33 and contains an opening 310 densely filled with the metal of the housing 1b, thus providing the aforementioned additional sealing of the zone 29.

Bend 33 is inclined obliquely outwards.

FIG. 2 and 3 also represent a part of the fastening 31 ', 31' 'in the form of a single part with the peripheral zone of the supporting surface 25', 25 '' and an insert embedded in the bottom 1a ', 1a' ', which may have the same characteristics as the previous 1a - also for the housing 1b ', 1b' 'with the bottom 21', 21 '' opposite 1b and 21-, and this is about the fastening part 31 ', 31' ', which has a peripheral part 1a', 1a '' the rising edge 35 ', 35' ', where there is a retaining fastening of this part in the (under) bottom of the metal housing 1b', 1b '' in the area located on the edge of the aforementioned supporting zone 25 ', 25' '.

FIG. 2 depicts a holding fixture 29 ′ comprising openings 310 ′ extending through the fastening portion 31 ′ and densely filled with body metal. Holes 310 'are arranged along a curve, in this case, along a radius.

FIG. 1 and 2 show a peripheral rising edge 35, 35 'embedded only in the edge of the housing, and thus fully visible. In FIG. 1, this part is based on a curve that connects the edge 35 'and the zone 25', which intersects the holes 310 '. In FIG. 1, said rising portion 35 is an external perforated peripheral flange 31.

In FIG. 3, the curved peripheral bent edge 35 ″ ends in the housing 1b ″ where it is thus rigidly fixed.

Among the characteristics useful for the implementation of the invention, but not required, it is noted that:

- zone 25, 25 ', 25' 'may be at least completely flat,

- this continuous support zone is a continuous rim; the rim can be made of several parts,

- a continuous continuous zone may surround the gear zone 210, 210 ′, 210 ″ of the housing 1b, 1b ′, 1b ’,

- the fixed part 31, 31 ', 31' 'is made integral with the insert also for the zone of the supporting surface; otherwise, the fastening part can be used to fasten the area of the supporting surface, while the central part of the insert can be fixed, however, as, for example, in previous embodiments; this, in any case, complicates the manufacture,

- the insert 1a, 1a ', 1a' 'may not contain a perforated zone 231, 231', 231 '' - or only one or more of these zones - but as a replacement - or in addition - at least one toothed attachment zone as shown in FIG. four,

- the perforated or toothed zone of the bottom plate and / or the toothed zone of the metal body, from the bottom of which this plate is attached, is placed on the lower surface curved to the bottom; as regards such an embodiment, a shoulder such as a downward bend could be provided.

In FIG. 4, reference numeral 241d depicts a toothed zone for fixing an insert 10a cooperating with a toothed zone 210d of a housing 10b under which this insert is attached with a protruding support region 25d. This is less preferable in terms of fastening, but provides advantages in induction heating.

Two manufacturing methods are particularly preferred for the preparation of the described cookware or at least a bottom for such cookware. Indeed, it is shown below that the bottom can be obtained separately, on the one hand, and the rest of the body can be made, however, in particular, in the continuation of the bottom.

It is shown below that the insert 1a, 1a 'or 1a' 'is monoblock and more perforated than gear, while modifications to the gear version of the solution (see, for example, Fig. 4) are provided to a person skilled in the art, and the filling of the holes is replaced ledges between the teeth. It seems possible to simultaneously serrated and perforated execution.

Having clarified this, in accordance with the first embodiment of the method illustrated in FIG. 5a and 5b, the following steps are carried out.

First, on the one hand, they start from the untreated unformed block 37 of light metal — or light alloy — and, on the other hand, from the desired insert.

This insert is already perforated (and / or serrated) in those places where it is necessary, as described previously.

We accept that this is an insert 1a ″ of FIG. 3.

Typically (see FIG. 5a), a hollow insert base (called a capsule) is made of metal or a metal alloy harder than the metal of block 37 and has through holes 230 '' in the central part. These holes are arranged in successive radii around a continuous zone of 25 ″ wide (L) exceeding the smallest distance (d1), separating the two middle successive radii of the holes of this central part. The continuous zone is bounded around the circumference by a 35 ”peripheral rising edge.

Next, this hollow plate and block are interconnected and subjected to pressure (see Fig. 5b) to:

- (repeated) applying pressure (using a press) to the metal or more ductile alloy of the block, forcing it to fill the cavities 41 and the aforementioned holes 230 '' of the plate, the raised peripheral edge of which is pressed into the material of the block, connecting with it with its edge, as seen also in FIG. 3, and

- placing at least a portion of the lower surface of said continuous zone 25 ″ having at least a small protrusion (d) with respect to the lowest hole boundary of the central part, to obtain a peripheral zone of a continuous supporting surface realized by joining.

Typically, as shown in FIG. 5a, if the peripheral edge 35 ″ is initially vertical, then it can be deformed inward and / or outward during the joining process under pressure of the capsule and block and placed obliquely with respect to the central part of the insert (FIG. 5b). This may strengthen the mount.

According to a second method illustrated in FIG. 6a and 6b, the implementation of the solutions of FIG. 1 and 2.

Assume that the solution of FIG. 1. First, they start again, on the one hand, from the untreated unformed block 37 of ductile metal or light alloy, and, on the other hand, from the desired insert.

The insert is already perforated (or serrated) in those places where it is necessary, as described above. At this point, it is still in a flat plate state or already slightly curved, as in FIG. 6a, with the already mentioned concavity to ensure the position of the necessary height of the protrusion (d) (you can also a priori imagine the shape of the shoulder around the periphery for the same purpose, as already mentioned). The holes 230 in the central part can be arranged in accordance with successive radii around a continuous zone 25, the width (L) of which exceeds (d1). This zone 25 in this case along the perimeter is itself surrounded by holes 310, which can all be uniformly distributed over the same radius. But zone 25 may also be surrounded unevenly by openings 310.

It is then subjected to pressure (also using a press) to compress this plate and block 37 (see Fig. 6b) for:

- (repeated) the effect of pressure on the more ductile metal (alloy) of the block to press and insert into the surface of said plate 1a and to fill (all) of its holes due to fluidity,

- bending the plate to the block around the periphery of the solid zone to create at this point a bend 33 in the insert between, thus, the periphery of the zone 25 and the outer edge 250, and this bend is inclined relative to the Central part 23 and forms a flange 31 that surrounds it outside and which, like the entire insert, is rigidly fixed along the edge of block 37 (see also Fig. 1),

- to accommodate at least a part of said lower surface of said continuous zone 25, with at least a small protrusion relative to the lowest border of the hole 230 of the Central part in order to perform, as already indicated, the area of the supporting surface with a given protrusion.

Preferably, between said zone 25 and the peripheral holes 210, a bend 33 will be made so that the latter are in the flange region.

In accordance with the embodiment of FIG. 2, the outer raised peripheral edge 35 'will be bent so as to be pressed into the edge of the block, while the peripheral holes 310' arranged around the circumference of the joint will preferably have a good fit without interfering with the support.

FIG. 5a, 5b and 6a, 6b also illustrate that the pressure applied between each insert and block 37 causes, of course, deformation of this block, which ultimately takes the form of a bottom, in this case, 21 or 21 ''.

As shown, it is envisaged, in addition, that after this stage, the pressure deformation of the block will preferably continue until the bottom is obtained from the monoblock side wall (3 of Fig. 5c or 3 '' of Fig. 6c).

As regards the aforementioned use of pressure between the insert and the block 37, it will preferably be carried out by a press providing a cold “impact” (stamping) of 2000 tons. Stamping is carried out between the die and the punch, taking into account the skirt forming the side wall of light metal. Alternatively, you can resort to a rotary hood for the manufacture of the side wall.

As for the height of the punching to seal the insert, it is preferably at least equal to the thickness of the insert.

Regarding the manufacture of the zone of the supporting surface so that its plane protrudes from the rest of the bottom, it begins when the insert (or plate) is manufactured using, for example, a curved initial shape or later during the application of pressure between the insert and the block of ductile metal, and namely, when the side wall of the dishes is made or as part of a subsequent operation, namely, the application of pressure carried out on the bottom. The equipment for this is known.

Regarding, however, the type of connection made in the case of a perforated insert, it is possible, in particular, to resort to perforations with cutting edges, as described in EP-A-688525.

It is also possible, within the framework of the invention, to resort to an insert design comprising simultaneously perforated zones and gear zones.

In FIG. 7 is a bottom view that is a half-sectional view of FIG. 2 (section II-II) showing the concentric arrangement of perforations or central holes 210 ′ with an unperforated bearing surface 25 ′ of width L and additional outermost holes 310 ′. The harder insert 1a ′ peripherally ends at 35 ′ and extends with a more plastic bottom 1b between 35 ′ and 27 in the direction of the filled perforations (210 ′, 310 ′).

Claims (18)

1. Cookware (1, 1 ', 1 "), containing:
- a metal case (1b, 1b ', 1b ", 10b), locally limiting the lower part of the bottom of the dishes, having, in accordance with a section perpendicular to the bottom, a gear zone (210, 210", 210d);
- and at least one insert (1a, 1a ', 1a ", 10a), superimposed on the bottom, and duplicating the bottom of the aforementioned metal body, at least partially in the region of its bottom, said insert, which represents a lower surface is made of a harder metal than the metal of the metal casing, and in accordance with the aforementioned section, represents at least one toothed zone (231, 231 ", 241d), rigidly fixed by joints (230, 230", 210a, 210a ') with a gear zone (210, 210 ", 210d) of said metal housing , and around which a protruding zone of the supporting surface (25, 25 ', 25 ", 25d) is placed, made continuously continuous in the form of a crown in said harder metal, characterized in that the peripheral zone of the supporting surface (25, 25', 25", 25d) has a width (L) greater than the smallest distance (d1) separating two consecutive teeth (210, 210 ", 210d) in the direction of a straight line (25a) connecting the center of the bottom and the peripheral edge (27) of the latter. 2. Cookware (1, 1 ', 1 "), containing:
- a metal case (1b, 1b ', 1b ", 10b), locally limiting the lower part of the bottom of the dishes, having in the perpendicular section to the bottom of the toothed zone (210, 210", 210d)
- and at least one insert (1a, 1a ', 1a ", 10a), superimposed on the bottom and duplicating from below the mentioned metal body, at least locally in the region of its bottom, while this insert, which has a lower the visible surface is made of a harder metal than the metal of the metal casing, and in accordance with the aforementioned section, represents at least one perforated zone (231, 231 ", 241d), fixed by joints (230, 230", 210a, 210a ') with a toothed zone (210, 210 ", 210d) of said metal casing around which a zone (25, 25 ', 25 ", 25d) of a continuously continuous peripheral supporting surface in the form of a crown made in said harder material is placed, characterized in that this zone (25, 25', 25", 25d) of the peripheral supporting surface is made protruding and has a width (L) greater than the smallest distance (d1) separating two consecutive teeth (210, 210 ", 210d) in a direction in a straight line (25a) connecting the center of the bottom and the peripheral edge (27) of the latter. 3. Cookware according to claim 1 or 2, characterized in that the area of the peripheral supporting surface (25, 25 ', 25 ", 25d) is made in the form of a single part with an insert (1a, 1a', 1a", 10a) superimposed on the bottom. 4. Cookware according to claim 1, characterized in that the insert (1a, 1a ', 1a ", 10a) of solid metal is intended for induction heating of dishes. 5. Cookware according to claim 3, characterized in that in the area with located away from and in depth from the zone of connections (230, 230 ", 210a, 210a ') and from the peripheral zone of the supporting surface (25, 25', 25" 25d), an overlay on the bottom is locally pressed (29, 29 ', 29 ") into the metal housing (1b). 6. Cookware according to claim 3, characterized in that in the zone located outside and to the side in depth from the said connections (230, 230 ", 210a, 210a ') of the periphery of the said zone of the peripheral supporting surface (25, 25', 25 ", 25d) and from the surface of the casing, which is covered by the last insert placed on the bottom, is additionally locally pressed (29, 29 ', 29") into the metal casing. 7. Cookware according to claim 3, characterized in that the peripheral support zone (25, 25 ', 25d) is extended along the periphery for fastening to the said metal case by the fixing part (31, 31'), made in the form of a single part with an insert ( 1a, 1a, 10a), superimposed on the bottom and which forms a raised part located in depth relative to the said peripheral support zone (25, 25 ', 25d) and having openings (310, 310') densely filled with metal of the metal casing (1b, 1b ', 10b). 8. Cookware according to claim 7, characterized in that said raised peripheral part is sealed only along the edge of the housing (1b ') and has a bend at the base intersected by holes (310') densely filled with metal of the metal housing. 9. Cookware according to claim 7, characterized in that said raised peripheral part forms an outer peripheral flange (31), in which the holes (310) are densely filled with metal of the metal housing (1b). 10. Cookware according to claim 3, characterized in that the peripheral zone of the supporting surface (25 ") is continued for peripheral fastening to the said metal case (1b") by the fixing part (31 "), made in the form of a single part with the insert (1a "), superimposed on the bottom and having the shape of a bent edge (35"), the edge of which is pressed into the material of the block and placed obliquely relative to the Central part of the insert (see fig.5b and 5C). 11. Cookware according to claim 1, characterized in that the area of the supporting surface (25, 25 ', 25 ", 25d) has along the said section, perpendicular to the bottom and a straight line (25a) connecting the center of this bottom and its peripheral edge (27), a width (L) greater than or equal to the width (L ') between the corresponding inner and outer borders of the group of two teeth (210), respectively, the outer (210 s') and inner (210a') metal casing, separated by at least least third tooth (210b '). 12. The manufacturing method used to obtain cookware according to claim 2, in which the metal insert (1a, 1a ', 1a ", 10a) contains at least one perforated zone (231, 231", 241d) or, according to at least the bottom of the cookware, comprising the following steps, in which:
- supplying a preformed raw block (37) of light metal or light metal alloy,
- supply a hollow insert (1a ") made of metal or a metal alloy harder than the metal of the block, while the insert contains in the central part through holes (230") placed along successive radii and the surrounding continuous zone (25 ") having in the direction of a straight line (25a) connecting the center of the insert (1a) and its periphery (27) a width (L) exceeding the smallest distance separating two consecutive radiuses of the holes (230 ") of this central part, said solid zone ( 25 ") surrounded by peripheral elevated edge (35 "),
- puts pressure on the hollow plate and block, compressing them together before
- a more ductile metal or alloy of the block (37), under the influence of pressure, fills the cavity in the said openings (230 ") of the insert, the raised peripheral edge (35") of which is tightly inserted into the material of the block, with its end immersed in it, and
- at least a portion (1b, 1b ', 1b ") of the lower surface of said solid zone (25") at least slightly protruding from the lowest boundary of the openings (230 ") of the central part is positioned so that a solid peripheral support zone (25 "), where the focus of the resulting structure on the support is concentrated. 13. The method according to p. 12, characterized in that in the process of applying pressure, the raised peripheral edge (35 ") is deformed and it takes an inclined position relative to the central part (231") of this insert (1a). 14. The manufacturing method used to obtain cookware (1, 1 ') according to claim 2, in which the metal insert (1a, 1a') contains at least one of the aforementioned perforated zone (23, 231) or at least least the bottom of the cookware, comprising the following steps, in which:
- deliver a preformed raw block (37) of light metal or light metal alloy,
- deliver the insert (1a, 1a ') in the form of a plate of metal or a metal alloy harder than the material of the block containing through holes in the central part (230) arranged along successive radii with a continuous zone around it (25, 25'), and having in the direction of a straight line connecting the center of the plate and its periphery, a width exceeding the smallest distance dividing two consecutive radii of the holes (230) of this central part, and this continuous zone itself is surrounded by at least locally peripheral from versts (310.31),
- pressure compression of the insert and block (37) with each other to:
bending the plate to the block (37) along the periphery of said continuous zone (25, 25 '),
exposing the metal or more ductile alloy of the block to pressure to push the edges of the insert (1a, 1a ') into it and fill said openings of this insert,
placing a part of at least the lower surface (11a) of said continuous zone (25, 25 ') with at least a small protrusion relative to the lowest border of the holes (230) of the central part (23, 231) so as to form a continuous peripheral support zone (25, 25 '), where the focus of the resulting structure on the support is concentrated. 15. The method according to 14, characterized in that the bend (33) is formed between the area of the supporting surface (25) and the peripheral holes (310) so as to create a raised outer peripheral edge (31), pressed along the edge of the formed block. 16. The method according to 14, characterized in that the bend (33) is performed so that the peripheral holes (310, 31) are located along its curvature. 17. The method according to one of paragraphs.13 and 14, characterized in that the pressure deformation of the block (37) is continued until a side wall (3, 3 ', 3 ") is monoblock with the part on which the insert (1a, 1a is superimposed) ', 1a "). 18. The method according to one of paragraphs.12 or 14, characterized in that the insert is delivered in such a form that from the side of the lower surface (11a) of the continuous zone (25, 25 ', 25 ") it has a curved surface (100a), concave down .

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