WO2015150155A1

WO2015150155A1 - Method for producing a domestic appliance component having a recess in a cleaning layer, as well as a domestic appliance component and a domestic appliance

Info

Publication number: WO2015150155A1
Application number: PCT/EP2015/056188
Authority: WO
Inventors: Frank JÖRDENS; Jürgen Salomon; Philipp Schaller; Gerhard Schmidmayer
Original assignee: BSH Hausgeräte GmbH
Priority date: 2014-04-02
Filing date: 2015-03-24
Publication date: 2015-10-08
Also published as: DE102014206274A1

Abstract

The invention relates to a method for producing a domestic appliance component (3, 7), in which an adhesion-promoting layer (11) is applied to a main part (10) that has been provided and a cleaning layer (8) is applied to said adhesion-promoting layer (11) and in which, prior to said cleaning layer (8) and adhesion-promoting layer (11) being baked, at least one recess (9, 9') is produced in the cleaning layer (8) for the purpose of relieving the tensile stress in said cleaning layer (8). The invention also relates to a domestic appliance component (3, 7) and to a cooking appliance (1).

Description

A method of manufacturing a household appliance component with a recess in a cleaning layer and household appliance component and household appliance

The invention relates to a method for producing a household appliance component, in which an adhesion-promoting layer is applied to a provided base body and a cleaning layer is applied to the adhesion-promoting layer. Furthermore, the invention relates to a household appliance component and a cooking appliance with such a household appliance component.

From DE 10 2007 034 683 A1, a laminated body for a household appliance component is known, in which an adhesion-promoting layer and, subsequently, a cleaning layer are applied to a base body. The adhesion-promoting layer is in particular an enamel layer and the cleaning layer is such a layer which facilitates the cleaning of this component during operation or during a specific operation, for example during a cleaning cycle, for example an ecolysis cycle (for example at about 320 ° C.) or a pyrolysis cycle (for example in US Pat Temperatures around 500 ° C or greater), a cooking appliance, improved. Household appliance components with such a layer sequence are usually processed by baking processes during manufacture, so that the corresponding layers are cured and connected to one another. Such a burn-in can lead to the formation of cracks in the cleaning layer, which is also referred to as the ecolysis layer.

It is an object of the present invention to provide a method for producing a household appliance component as well as such a household appliance component and a cooking appliance with such a component, with which or at which such cracking is at least substantially reduced.

This object is achieved by a method, a household appliance component and a cooking appliance according to the independent claims. In a method according to the invention for producing a household appliance component, a main body of the household appliance component is provided. On this a bonding layer is applied. Subsequently, a cleaning layer is then applied to the primer layer.

An essential idea of the invention is to be seen in the fact that at least one depression, in particular in the form and / or position defined before burning the cleaning layer, and thus in particular a firm bonding of the cleaning layer with the bonding layer in the cleaning layer to the Zugspannungsentlastung the cleaning layer the subsequent burn-in of the cleaning layer is generated. By means of this specifically formed, at least one tensile stress relief depression in a very specific layer, namely the cleaning layer, the undesirable cracking in this cleaning layer, which results in particular tensile stresses in the subsequent firing, is substantially reduced, in particular prevented.

Just when a first firing takes place in the manufacture of the household appliance component, in which the adhesion-promoting layer is to be applied to the base body and secured accordingly and then followed by a second baking, in which the cleaning layer is firmly connected to the bonding layer and cured, they can Cracks occur, but this is prevented by the invention. These cracks occur in the prior art due to the failure of the relaxation of the cleaning layer. With regard to the adhesion-promoting layer, in particular a layer is to be understood which has at least two sides and at least parts of at least two of the sides adhere to at least two other bodies and / or layers and / or are fixed and / or fixed, the adhesion-promoting layer being provided in particular to allow increased adhesion of the cleaning layer to a direct coupling between the base body and the cleaning layer.

In particular, the adhesion-promoting layer has a softening temperature and / or a transformation range which is below a Softening temperature and / or a transformation range of the body are or is. A softening temperature of a substance and / or a body is understood in particular to mean a temperature at which the substance and / or the body has the greatest change in its deformability. A transformation region is intended to represent a temperature range in which the mechanical behavior of a substance and / or a body changes substantially, and is particularly advantageous to be understood as a transition temperature range between melt and solid. Preferably, the softening temperature and / or a melting temperature of the primer layer are about 500 ° C or greater, for example, up to 820 ° C.

The adhesion-promoting layer is preferably formed as a glass frit and / or as a silicate binder. A glass frit is to be understood in particular as an intermediate in the production of glass melts. By silicatic is meant in particular a kind of silicate.

The adhesion-promoting layer is preferably an enamel layer.

A cleaning layer should in particular be understood to mean a layer of this kind which can exert and / or assist a cleaning action and / or a cleaning function in at least one operating mode of the domestic appliance, in particular in an improved manner relative to the main body itself the cleaning layer is formed as a catalytic cleaning assisting layer. A catalytic purification is to be understood in particular to mean a purification which takes place on the basis of an acceleration and / or an enabling of a chemical reaction, in particular in comparison to a corresponding reaction to the basic body. This can be a particularly thorough cleaning, especially the cleaning layer can be achieved. The cleaning layer is also referred to as an ecolysis layer. Incidentally, reference is made to the explanations in DE 10 2007 034 683 A1 for further explanation and illustration of the adhesion-promoting layer and the cleaning layer. Preferably, the at least one depression in the cleaning layer is produced as a strip. This specific geometry allows a very needs-based relaxation of the cleaning layer, so that the cracking is greatly reduced.

It can be provided that the depression is generated in a straight line or arcuate manner. As a result, the desired position and / or shape of the depression in the cleaning layer can be formed depending on the situation, depending on the situation.

It is preferably provided that the number and / or shape of the recess is generated depending on the geometry of the household appliance component to be produced. Such a configuration is adapted to the circumstances of the household appliance component very variable and flexible with respect to the design of one or more recesses, so that here as well as possible a most extensive reduction of cracking during subsequent firing is achieved.

It is preferably provided that the at least one depression in the cleaning layer is at least partially scored. This can be done with appropriate tools and damage to the cleaning layer and an undesirable deformation or design of the recess is thereby prevented. By scoring a very precise and thinnest possible recess can be achieved.

Alternatively it can be provided that the at least one depression in the cleaning layer is generated at least in regions with a laser. This also achieves the above advantages.

The depression is preferably produced with a depth which is at least 30%, in particular at least 60%, in particular at least 75%, in particular at least 90%, of the layer thickness of the cleaning layer. By such a relatively deepening depression, the required relaxation of the material of the cleaning layer is very favored. Preferably, the recess is produced by a complete removal of the cleaning layer at the location of the recess up to the adhesion-promoting layer. The recess is therefore formed virtually completely through the cleaning layer, so that in the area of the depression when looking at the household appliance component of the cleaning layer ago, the primer layer and its top can be seen. The relaxation of the cleaning layer material is further improved depending on the situation in this embodiment.

The adhesion-promoting layer is preferably formed in the region vertically below the depression after the firing of the cleaning layer and the adhesion-promoting layer with a layer thickness of at least 35 μm, in particular at least 40 μm. It is therefore ensured in the manufacturing process that the layer thickness of the bonding layer does not remain too thin, if then the last burn-in step was completed. As a result, undesired functional impairments of the adhesion-promoting layer and the base body arranged thereunder can be prevented.

In particular, the adhesion-promoting layer is formed in the region vertically below the depression after the firing of the cleaning layer and the adhesion-promoting layer with a layer thickness of at least 50%, in particular at least 75%, preferably at least 90%, of the layer thickness prior to the firing of the cleaning layer and the adhesion-promoting layer. After stoving the cleaning layer and the adhesion-promoting layer, a layer thickness of the adhesion-promoting layer thus remains, which has at least the stated percentage of the layer thickness before this stoving process. This also prevents undesired removal of the layer thickness of the adhesion-promoting layer. As a result, the corrosion stability of the household appliance component and in particular of the basic body, which is preferably made of metal, is retained. In this case, the notch or perforation depth of this at least one depression is formed in such a way that it is ensured that a closed, sufficiently thick adhesion-promoting layer is retained after the last burn-in process. Preferably, the width of a recess is formed as thin as possible, in particular the recess designed so that their length is greater, in particular by a multiple greater than their width.

In a particularly advantageous manner, it is provided that a depression in the cross section and thus in section through the entire layer structure is produced with a form that tapers towards the adhesion-promoting layer. The above-mentioned advantages with respect to the sufficient relaxation of the material of the cleaning layer on the one hand and the corresponding protection of the primer layer and the base body on the other hand is thereby particularly achieved.

In particular, it is provided that a depression in cross-section is formed with a V-shape.

In a further preferred embodiment it is provided that a depression in a grid-like structure is applied in the cleaning layer. Preferably here is a grid pattern with in particular uniformly arranged squares, in particular formed like a checkerboard. This specific pattern is particularly noteworthy with respect to the above requirements. It is preferably provided that the adhesion-promoting layer and the material of the base body are baked before the application of the cleaning layer to the adhesion-promoting layer. It is thus preferably in this regard, a first baking, then the cleaning layer is applied and after generating the at least one well, then further firing is completed by the cleaning layer and the bonding layer cured and interconnected, in particular fused, are.

The invention is therefore particularly particularly advantageous if two such layers, namely the bonding layer and the cleaning layer are processed by two separate burn-in during manufacture, in this regard, the above-mentioned sequence takes place and the cleaning layer in the first baking especially not yet available and the second Burning process only the bonding layer and the cleaning layer are connected. Preferably, a household appliance component is provided, which is produced by a method according to the invention or an advantageous embodiment thereof and is a component defining a cooking chamber of a cooking appliance. This household appliance component can thus be a part of a muffle in the context. This limits the cooking space.

Furthermore, the invention relates to a cooking appliance with a household appliance component according to the invention. It is also to be provided that the at least one recess is designed so that the substrate or the base body, which is in particular a sheet, is not deformed or physically altered by this depression, otherwise a deformation of this sheet metal part occur when thermal energy is introduced could. The depression is at least produced in such a way that it is introduced into the dried ecolysis layer or cleaning layer before the second firing process and thus before the firing of the cleaning layer and the associated firm bonding of the adhesion-promoting layer with the cleaning layer. For example, scribing can be done with a blade or needle or rotating or oscillating or oscillating tools or other abrasive methods.

An embodiment of the invention will be explained in more detail with reference to schematic drawings. 1 is a perspective view of an embodiment of a cooking appliance according to the invention;

2 is an enlarged view of the portion of an embodiment of a household appliance component according to the invention. and

Fig. 3 is a schematic sectional view of the embodiment

Appliances component. In the figures, identical or functionally identical elements are provided with the same reference numerals.

In Fig. 1, a cooking appliance 1 is shown as a household appliance. The cooking appliance 1 comprises a housing 2 which surrounds a muffle 3, wherein the muffle 3 defines with its walls an interior which constitutes a cooking chamber 4. On the front side, the muffle 3 has a charging opening, which can be closed by a door 5. In addition, the cooking appliance 1 comprises an operating device 6 only in terms of position and configuration. In the exemplary embodiment, it is provided that the muffle 3 is designed as a multi-layered construction, at least in partial areas or partial components, as will be explained below.

For this purpose, a view of a rear wall 7 of the muffle 3 is shown in FIG. 2, wherein a top 8a of a cleaning layer 8 facing the interior or the cooking space 4 is shown here. This top 8a is formed with one or more recesses 9, which are formed in the embodiment shown as a symmetrical, checkerboard-like grid pattern. For further explanation, reference is made to Fig. 3, which shows a sectional view through a layer structure along the section line III-II I in Fig. 2. The layer structure of the rear wall 7 is designed such that a base body 10 is provided as a sheet metal part. On a the cooking chamber 4 facing top 10 a of this body 10 is an adhesive layer 1 1, which is in particular an enamel layer applied. On a the cooking chamber 4 facing top 1 1 a of this bonding layer 1 1, the cleaning layer 8 is shown with the top 8a.

For the preparation of this component, the base body 10 is first provided and then the adhesion-promoting layer 1 1 in particular as an enamel biscuit or powder, which is thus not yet baked and cured, applied. This material stays on top 10a. Subsequently, in a first burn-in, a connection between the adhesion-promoting layer 11 and the base body 10 is achieved, in particular by melting, and the adhesion-promoting layer 11 is also hardened. Subsequently, the material of the cleaning layer 8 is then applied, which is then also applied as a biscuit, which is thus not yet completely cured. In a subsequent step, an exemplary recess 9 is then formed. The recess 9 is, as shown in Fig. 3 in the cross-sectional view, formed with a to the bonding layer 1 1 towards tapered shape, in particular a V-shape. In the exemplary recess 9, this is designed with a depth (z-direction) which is less than a layer thickness d1 of the cleaning layer 8. Nevertheless, the recess 9 is formed with a depth in the z-direction which is at least 30%, in particular at least 60 %, in particular at least 75%, in particular at least 90% of the layer thickness d1.

In addition, in FIG. 3, by way of example, a further recess 9 'is shown, the depth of which extends over the entire layer thickness d1. In this recess 9 'is thus the top 1 1 a of the bonding layer 1 1 exposed.

After the formation of at least one recess 9, 9 ', a second baking or a second baking process is then carried out, in which the cleaning layer 8 is then connected to the bonding layer 1 1, whereby a corresponding melting of the materials takes place and hardening is then achieved becomes.

In particular, the recesses 9, 9 'are also designed so that after this second baking the bonding layer 1 1 still has a layer thickness d2, which has at least 50%, in particular at least 75%, in particular at least 90% of the layer thickness before this second baking and / or at least 35 μηη, in particular at least 40 μηη, is.

The depression 9 or the depressions 9, 9 'can be produced by scoring and / or by laser light.

It should be pointed out that the number and / or shape of the at least one recess can vary in particular depending on the geometry of the household appliance component to be produced. LIST OF REFERENCE NUMBERS

1 cooking appliance

2 housings

3 muffles

4 cooking space

5 door

6 Operating device 7 Rear wall

8 cleaning layer

8a top

9, 9 'depressions

10 basic body

10a top

1 1 adhesion layer

1 1 a top

d1 layer thickness d2 layer thickness

Claims

claims

1 . Method for producing a household appliance component (3, 7), in which a primer layer (1 1) is applied to a primed body (10) and a cleaning layer (8) is applied to the primer layer (1 1), characterized in that prior to burn-in the cleaning layer (8) in the

Cleaning layer (8) at least one recess (9, 9 ') for tensile stress relief of the cleaning layer (8) is generated.

2. The method according to claim 1, characterized in that the at least one recess (9, 9 ') is generated as a strip.

3. The method according to claim 1 or 2, characterized in that the recess (9, 9 ') is generated rectilinear or arcuate.

4. The method according to any one of the preceding claims, characterized in that the number and / or shape of the recess (9, 9 ') depending on the geometry of the produced household appliance component (3, 7) is generated.

5. The method according to any one of the preceding claims, characterized in that the at least one recess (9, 9 ') in the cleaning layer (8) is at least partially scored.

6. The method according to any one of the preceding claims, characterized in that the at least one recess (9, 9 ') in the cleaning layer (8) at least

partially generated with a laser.

7. Method according to one of the preceding claims, characterized in that the depression (9, 9 ') is produced with a depth which is at least 30%,

in particular at least 60%, the layer thickness (d1) of the cleaning layer (8) is.

8. The method according to claim 7, characterized in that the recess (9, 9 ') by a locally complete removal of the cleaning layer (8) up to the

Bonding layer (1 1) is generated.

9. The method according to any one of the preceding claims, characterized in that the adhesion-promoting layer (1 1) in the region vertically below the recess (9, 9 ') after baking of the cleaning layer (8) and the bonding layer (1 1) with a remaining layer thickness (d2) of at least 35 μηη, in particular at least 40 μηι is formed.

10. The method according to any one of the preceding claims, characterized in that the adhesion-promoting layer (1 1) in the region vertically below the recess (9, 9 ') after baking of the cleaning layer (8) and the bonding layer (1 1) with a layer thickness ( d2) of at least 50%, in particular at least 75%,

in particular at least 90%, the layer thickness before baking the

Cleaning layer (8) and the adhesion-promoting layer (1 1) is formed.

1 1. Method according to one of the preceding claims, characterized in that a recess (9, 9 ') in cross-section with a to the adhesion promoting layer (1 1) tapered shape, in particular a V-shape is formed and / or the recess (9, 9 ') is generated as a grid pattern.

12. The method according to any one of the preceding claims, characterized in that before the application of the cleaning layer (8) on the bonding layer (1 1) the bonding layer (1 1) and the material of the base body (10) are baked.

13. The method according to any one of the preceding claims, characterized in that as an adhesion-promoting layer (1 1) an enamel layer is generated.

14. Household appliance component, which by a method according to one of

The preceding claims is prepared and a cooking chamber (4) of a cooking appliance (1) limiting component (3, 7).

15. Cooking appliance (1) with a household appliance component (3, 7) according to claim 14.