Cooking device to be used on a cooking surface

The invention relates to a method according to the preamble of Claim 1.

Cooking vessels of the type mentioned are long and numerous Known versions. For example, the CH-A-688 301 the applicant, such a cooking vessel, which formed as a pressure cooker is. It is also known that in such vessels with a multilayered ground its applications on different improved burners and reduced energy consumption can be. Such floors consist for example of one another connected, in particular soldered metal plates. Cooking vessels with such soils can also suitable for induction be. Although such cooking vessels have proven themselves in practice, is in such cookware due to construction Such soils of different materials, the problem of Soil stability due to bimetal effects on heating. in the With regard to energy consumption and the use of different Cooking zone there is a need soil stability by optimizing the material properties, in particular the thermal expansion coefficient, thermal conductivity, the modulus of elasticity and fracture toughness improve.

A method of said type is known from GB-A-561 766 known become. This is for forming a layer of soil a composite material cast onto a vessel. This composite consists of non-metallic particles such as slag or ash and a metallic matrix of aluminum and Zinc. WO 96/21384 discloses a cooking vessel, in which the bottom made from advanced ceramics, such as silicon nitride, silicon carbide is made or aluminum nitride. to connect of Engineering Ceramics with the vessel wall is a retaining ring is required.

The invention is based on the object, another method for the production of cooking vessels to provide.

According to the inventive cooking vessel can be physical Characteristics of the soil by changes in metal Material and the ceramic components to the desired values ​​targeted set to. It can be so very low coefficient of expansion and a high thermal conductivity at the same time achieve high fracture toughness. A high modulus of elasticity, by a be adjusted correspondingly high proportion of ceramic. It is also advantageous that the specific gravity of the composite from the metallic material and the embedded ceramic Shares may be smaller than the specific gravity of the metallic Material itself. A particularly high conductivity can be achieved through a composite of ceramic with copper.

To make the induction capability, can said metallic material containing iron. Alternatively, to said substrate is a plate made of ferritic material be soldered.

The invention enables the manufacture of a cooking vessel in Diecast, said substrate metal from the Material and the incorporated ceramic parts in the die casting is integrated. The bottom of the cooking vessel is then at least regions, of metal-impregnated ceramic. handles and can like in one operation produced as sprues will. The material here is especially aluminum or an aluminum alloy. The vessel wall and the Angus parts are made of this metallic material. In vessel bottom then this metallic material with ceramic units enriched.

Another advantage of the invention is also seen that the ground under each other in a simple manner and inexpensively comprising: Structure, for example, to form venting channels, can be produced. Such venting passages may be required be to the so-called "sticking" of the pot at a particularly plan to prevent hotplate.

Further advantageous features emerge from the dependent Patent claims, the following description and the Drawing.

Embodiments of the invention will be described with reference to the Drawing explained. Show it:<dl tsize="15" compact="compact"><dt>figure 1</dt><dd>a schematic section through a by the inventive method produced Cooking vessel, and</dd><dt>Figures 2 and 3</dt><dd>schematically illustrates the manufacture of the cooking vessel according to FIG. 1</dd></dl>

3 shows a cooking vessel 3, the die casting, for example, Die-cast aluminum, is produced. Here are handles 12c or the like formed on the wall 12a of the pot 12th In the bottom 12b, a bottom portion 13 is integrated, the from the above-mentioned substrate, ie a metallic Material with incorporated ceramic parts 22 made. The ceramic parts 22 are shown schematically by the dotted area indicated. The manufacture of the cooking vessel 3, for example, carried out in accordance with FIGS. 4 and 5 The schematically here illustrated casting device 14 consists of an outer Tool part 14a and an inner tool part 14b and a reservoir 17. Figure 4 shows the inserted preform 16 of porous ceramic. The reservoir 17 contains the metallic Material 18, ie, for example aluminum or a Aluminum alloy. Between the two tool parts 14a and 14b is a gap 15 corresponding to the produced cooking vessel 3. To the metallic material 18 introducing in the interspace 15, this is evacuated and 20 to the material 18 applied a pressure in the direction of the arrow. This material 18 is now operational in the direction of arrows 21 in the intermediate space 15 and at the same time also in the pores of the Preform 16. The preform 16 is thus the metallic Material 18 impregnated. 5 shows the finished and Ejecting ready Kettle 3. for the cooking vessel 3 essential physical properties, as already mentioned, by the choice of the metallic material, the ceramic and the proportions of these components is set within wide ranges will. By said method the base is sure and integrated without difficult to clean steps or grooves in the vessel. unnecessary additional means for securing the base 13 therefore.