JPH0418531B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for coating a component with a layer containing a magnetizable material. Furthermore, the invention relates to a layer and a magnetization device for using the method.

In many technical fields and for a number of reasons, it is necessary for parts (eg flat or curved) to be coated with a layer that adheres well over time. For example, sound reduction or reinforcement of components in the manufacture of automobiles (doors, bonnets, roofs, etc.), household appliances, compressors or similar devices is often a goal. Furthermore, improvements in sound deadening properties often have to be achieved. Sound attenuation and enhancement techniques are becoming increasingly important as there is now a general desire to save material and weight by selecting relatively thin walls. The layer carried on the component may be a facing layer or a decorative layer, for example completely covering the component. However, the term layer also includes a number of layer pieces carried separately and adjacently on a member.

In automobile manufacturing the following is known:
A sound attenuating layer and/or reinforcing layer (often colloquially referred to as a "folie"), typically a few millimeters thick, coated with a layer of heat-sensitive adhesive, is used to reduce the sound and/or / or placed on the member to be strengthened. Adhesive bonding is then effected by heating (for example in a lacquer drying oven). A disadvantage of this method is that the parts to be coated with this foil must be kept in a sufficiently horizontal position so that the desired position is maintained during the adhesive bonding. This requirement is often not compatible with the configuration of automotive manufacturing processes.

In order to avoid this drawback, it has been proposed to fill this foil or layer with a magnetizable material and to magnetize this material during the manufacturing process of the foil. This type of foil can also be held on vertical or overhead iron plate walls for a limited period of time due to its magnetic force. The magnetized foil coated with heat-sensitive adhesive is therefore carried on the individual components without affecting their position after the final assembly. The production of the adhesive bond takes place, for example, in an associated oven during subsequent lacquer drying.

A disadvantage of this method is that the magnetization of the layer or foil is limited in time. The reason for this is that this foil must be collected and stored. By having many adjacent layers, the mutually generated magnetic fields interact, which causes them to lose their original strength relatively quickly. The magnetized foil is therefore only sufficient for a limited period of time to perform the desired function of adhering by its magnetic force to the respective component until an adhesive bond is formed. This makes it impossible to trust this feature at all. This risk is
Especially great when using leftover inventory like stacking new inventory from time to time. Since such stocks are always removed for use from the top down, the bottom layer is often stored for a very long time before use.

Furthermore, magnetism is sensitive to heat. If the magnetization of the layer is already not very strong, the additional magnetic losses in the lacquer drying oven cause the layer to separate from its base before adhesive bonding can take place. This requires complicated and expensive post-processing.

It is therefore an object of the present invention to provide a method for coating a component with a layer containing a magnetic material that does not have the aforementioned drawbacks.

This problem is solved in the invention by magnetizing the magnetic material immediately before depositing the layer on the component. Magnetizing this layer directly at the point of use has the advantage that the magnetization is always "fresh" and that a safe attachment is achieved until the subsequent adhesive bonding takes place. The magnetization of these layers, foils, etc. at this “neighboring position” is static;
This can be done, for example, by placing these layers on the pole faces which generate the magnetic field, or dynamically, ie by passing them through the magnetic field. An optimum magnetization of the magnetizable material contained in this layer was achieved, and thereby the production of the highest possible magnetic force with minimal magnetization costs. This magnetic force does not weaken directly from the point of magnetization until the deposition of the layer on the respective component.

Because of this optimal generation of magnetic force, the amount of magnetizable material present in the layer can be smaller than before.
Furthermore, savings in material costs can also be achieved. The low amount of magnetizable material in the layer also leads to a rapid decrease in magnetism after adhesive bonding has taken place. The interfering influence of the magnetic field on radio reception in the motor vehicle is thereby eliminated within a relatively short period of time.

An advantageous device for generating a magnetic field for the magnetization of the magnetizable material contained in the layer is, for example, a magnetic table known in magnetic mounting technology. Such devices have a number of opposing poles on the surface separated by non-magnetic material. The generation of the magnetic field in the area of the polar surface takes place permanently magnetically or electromagnetically, for example by changing the relative position of two permanent magnet systems. When a layer or foil containing a magnetizable material is placed on such a surface, after a short time this material becomes magnetized.

Magnetization occurs more quickly and safely the smaller the distance between the magnetizable material and the pole face of the magnetic table. It is therefore advantageous to have a high concentration of magnetizable material on the side of the layer that rests on the polar side. This special feature has a layer covered with foil containing a magnetic material.

The accompanying figures 1, 2 and 3 show a layer or foil 2 placed on a magnetic table 1, indicated by dotted lines. This magnetic table 1 is always in a directly "neighboring position",
That is, the respective magnetized layer 2 is used immediately, i.e. adjacent to the location where the magnetized layer 2 is preferably carried on a component containing ferromagnetic material.

FIG. 1 shows a bitumen-containing layer 2, which is known for the purpose of sound attenuation in iron plate walls. Magnetizable material 3 is homogeneously distributed in layer 2. After magnetization of material 3,
Layer 2 is carried on the iron plate wall to be sound attenuated. After being placed, if the position is incorrect, it is easy to overcome the magnetic force, release it, and place it again in the correct position. Subsequently, layer 2 and the steel wall are heated for adhesive bonding. Since the bitumen itself has the special properties of heat-sensitive adhesive, it is adhesively bonded after cooling.

In the embodiment according to FIG. 2, layer 2 is the outer layer 4.
, each having desired properties (sound attenuation layer, reinforcing layer, decorative layer, etc.). On top of this outer layer is placed a foil 5 which contains a large amount of magnetizable material and which, when placed on the magnetic table 1, is placed in close proximity to the surface of this table. Between the foil 5 and the surface of the magnetizing table 1 there is a relatively thin layer of heat-sensitive adhesive 6, which is used for producing the subsequent adhesive bond.

FIG. 3 shows another variant of layer 2 that can be used in the method according to the invention. This layer consists of a layer 4 with the desired properties in each case and a layer 6 of heat-sensitive adhesive. The difference from the embodiment according to FIGS. 1 and 2 is that the magnetizable material 3 is present in the heat-sensitive adhesive layer 6. This results in the presence of magnetizable material in close proximity to the surface of layer 2.

FIG. 4 shows a mold part 7 in cross section, which mold part is not flat but has a shape adapted to the part to be coated, and the magnetic table 1 has a surface adapted to this mold material. The mold part consists of an upper foil 8 which covers a mold part 9 consisting of foam or impregnated and hardened fleece. The underside of the mold part 9 is covered with a foil 10 containing magnetizable material 3 .

Magnetic table 1 on which various poles 11 are visible
The surface of has a depression 12 corresponding to the shape of the mold part 7. For magnetization, the mold part 7 is placed in such a way that the foil 10 with the magnetizable material 3 rests directly on the poles 11.
Place it in the depression 12. After magnetization, the mold part 7 is carried on the part to be coated. Here too, the foil 10 with the magnetizable material 3 is placed directly abutting its support and the magnetic force is fully exerted. Even if this mold part partially borders the part due to mold tolerances, a perfect areal bond between the part and the foil 7 is ensured due to the magnetic forces acting during the adhesive bonding. This is because the mold part 7 conforms to the exact shape of the part during heating by the action of magnetic forces.

When carrying the mold member according to the invention,
This mold element specifically achieves that purpose. Due to the all-over bond with the part to be coated, an enhanced and sound-dampening effect is achieved with particularly good sound damping properties.

[Brief explanation of drawings]

The accompanying drawings are schematic diagrams illustrating an embodiment of the invention, with Figures 1, 2 and 3 showing the layers and foils on the magnetic table indicated by dotted lines, and Figure 4 showing the mold member on the magnetic table. show. DESCRIPTION OF SYMBOLS 1... Magnetic table, 2... Layer, 3... Magnetizable material, 4... Outer layer, 5, 10... Foil, 6... Heat-sensitive adhesive layer, 7... Mold member, 8... Upper foil ,9...
...Mold part, 11...pole, 12...indentation.

Claims (1)

Claims: 1. A method for coating a component with a layer containing a magnetizable material, characterized in that the magnetizable material is magnetized immediately before being deposited with the layer 2. 2. The method according to claim 1, wherein magnetization is performed statically or actively. 3. A method according to claim 1 or 2, in which the layer 2 is placed on the surface of the magnetic field generating device 1 immediately before being deposited on the member. 4. The method according to claim 3, using a magnetic table 1 known per se. 5. A method according to claim 1 or 2, in which the layer 2 is passed through a magnetic field over a band or the like immediately before being supported on the member. 6. To coat the iron-containing component with a layer containing a magnetic material, the magnetic material is magnetized, this layer is carried on the component and attached by magnetic force, and then heated to bond the layer and the component. A method for coating an iron-containing component with a layer containing a magnetizable material, characterized in that the method of bonding comprises magnetizing the magnetizable material immediately before depositing the layer 2 on the component. 7. In order to cover an iron-containing part with a non-flat shape with a mold part containing a magnetic material in the area of the interface facing the part, the magnetic material is magnetized and this mold part is supported on the part. A non-flat shaped iron-containing method characterized in that the magnetic material is magnetized immediately before the mold member 7 is supported on the member, in a method for adhesively bonding the layer and the member by magnetic attachment and subsequent heating. A method for covering a part with a mold part containing a magnetizable material in the area of the interface facing the part. 8. Device for coating a member with a layer containing magnetizable material, configured as a magnetic table with a surface adapted to the mold member 7 for magnetization. 9. Device according to claim 8, in which the surface of the magnetic table 1 has a shape corresponding to the part to be coated with the layer. 10. The device according to claim 9, wherein the surface of the magnetic table 1 is mainly flat. 11. The device according to claim 9, wherein the surface of the magnetic table 1 is not flat. 12 Used in a method for coating a member with a layer containing a magnetizable material, characterized in that it is covered with a foil 5 containing a magnetizable material 3, in which the magnetizable material is magnetized immediately before carrying the layer 2. layer. 13. The layer according to claim 12, which has a heat-sensitive adhesive layer 6 on the side of the magnetic foil 5. 14 having a heat-sensitive adhesive layer 6 and a magnetic material 3
Claim 1 containing in the heat-sensitive adhesive layer
Layer according to item 2. 15. A layer according to claim 12 having a shape corresponding to the member covered with layer 2. 16. The layer of claim 12 which is essentially flat. 17. The layer according to claim 12, which is not flat.