A method of manufacturing a cell element of the two types of metal sheets, distinguished according to their structure

 

(57) Abstract:

The invention is intended for the manufacture of cellular elements, used primarily as buildings carriers of catalysts in the exhaust gases of internal combustion engines. Cell element type in the package and/or rolled into a roll of metal sheet with high corrosion and heat resistance, which at least some sections have a structure forming channels for the passage of fluid. Use two types of metal sheets, which differ in their structure. The metal sheets of the same type are made of homogeneous steel containing at least chromium and aluminum. Metal sheets of a different type have a multilayer structure including at least one layer made of chromium steel, and at least a second layer containing mainly aluminium. The metal sheets are connected to each other by heat treatment. Metal sheets with a multilayer structure homogenizers due to the diffusion. The technical result - the production of cellular elements, including large diameter, greater than 90 mm, high quality at a small satanic metal sheets, typed in the package and/or rolled.

Such cell elements are mainly buildings-carriers of catalysts in the exhaust gases of internal combustion engines are known, for example, from the application WO 89/07488. Cell elements, which are used as buildings vehicles catalytic converters, used with the catalytic action of the floor for cleaning EXHAUST gas in the vehicles, and they are subjected to high mechanical and thermal loads. Along with thermal and mechanical load cell element is exposed to aggressive components present in the EXHAUST gas. To increase the service life of the cell element, it is expedient, in particular, to ensure high corrosion resistance metal sheets.

From application EP 0159468 B1 is already known to use preferably a steel sheet with high aluminium content. However, the use of such material is problematic due to the fact that steel with a high content of aluminum has poor prokalivaemosti, resulting in the manufacture of such sheet additional expenses arise. This problem also consider is made of steel, plated aluminum. Such leaves are to a certain extent amenable to treatment with a low cost.

The present invention was based on the objective to develop a method of manufacturing a cell element of typed in the package and/or twisted in a coil of metal sheet with high corrosion and heat resistance, which at least partially have a structure forming channels for the passage of fluid, and it is this method that would be most suitable for production of honeycomb element with application of a metal sheet having a multilayer structure.

This task is solved by the method of manufacturing a cell element with the distinctive signs of paragraph 1 of the claims. Preferred embodiments of the presents in dependent clauses.

Proposed in the invention is a method of manufacturing a cell element of typed in the package and/or twisted in a coil of metal sheet with high corrosion and heat resistance, which at least partially have a structure forming channels for the passage of fluid, characterized in that the mobile element is rolled into a roll and/or type in a package of two types metallics of homogeneous steel containing at least chromium and aluminum. Metal as the leaves of the other type have a multilayer structure including at least one layer made of chromium steel, and at least a second layer containing mainly aluminium. The metal sheets are connected to each other by heat treatment, and the metal sheets of the multilayer structure homogenizers due to the diffusion.

Proposed in the invention method allows, in particular, to produce cellular elements, which have a relatively large cross-section, of a metal sheet having a multilayer structure. It was found that in the manufacture of cellular elements, which were made only from metal sheets with a multilayer structure, may not always be provided for the connection of the sheets between itself and/or with a casing covering the cell element. It was found further that when heat-treated cell element leaves with a multilayer structure of the decrease in its volume. Reducing the amount of leaves due to the fact that aluminum, forming at least the outer layer of sheet metal, in the process of heat treatment diffuses into the first layer of steel, salageanu the method of manufacturing a cell element decreases due to what cell element is rolled into a roll and/or type in the packet of metal sheets of different types, distinguished by their structure. In accordance with the invention it is proposed to use metal sheets of different types, one of which is made mainly of homogeneous steel containing at least chromium and aluminum, and the other part has a multilayer structure. Due to this, in the manufacturing process improves the elastic properties of laminated metal sheets.

In accordance with another preferred option is offered to produce a cell element of a variable-alternating layers of smooth and corrugated sheets. In such a cell element, it is preferable to use a smooth leaves, mainly made of homogeneous material, and a corrugated sheet having a multilayer structure. Due to this, much of the material can be a cheap to manufacture multi-layer material that can be easily shirring.

For special applications and for large diameters may be preferred, however, and the opposite option, namely the manufacture of plain sheets of laminated material.

who and which both sides suffered, preferably nabalitaan, containing mainly aluminum layer. The advantage of this sheet is that first of all during heat treatment of the adjacent layers of the sheets are interconnected at their places of contact due to the diffusion. Along with the possibility of connection layers of the sheets to each other by diffusion is offered before or after twisting into a roll or packaging to provide leaves at least some areas of the solder and to bind them together in a single operation thermal treatment. Thanks to this custom cell element has a high mechanical strength.

To ensure that during the heat treatment, the constant contact between the layers of sheets, i.e. that these places of contact did not disperse, according to another preferred variant of the method is proposed to compensate for the volume reduction of the sheets of the multilayer structure due to the elastic recoil of the sheet layers. This leaves in the process of rolling into a roll or after this process is inserted into a tubular casing with preload.

Part of the metal sheets, it is preferable to provide additional microstructure. By performing additional their constant contact during thermal processing preload cell element, as defined microstructures of the contact areas have a smaller area compared to conventional linear in places of contact between the metal sheets. Microstructure contribute to improving the mixing of the gas flowing through the cell element. The microstructure is preferably applied to curl into a roll or packaging of sheet metal. The microstructure of the as such made in the form of patterns, passing transversely channels, and is known, for example, from application EP 0454712 B1.

In accordance with another preferred option proposes a method of manufacturing a cell element, according to which the cell element is inserted into the tubular casing, the inner surface of which, at least in some areas, has a layer consisting mainly of aluminum. The advantage is designed tubular casing is that contact with the casing metal sheets can be joined at the points of their contact with the casing due to the diffusion. It also improves the corrosion resistance of the tubular casing to corrosive EXHAUST gas.

Other advantages and features of the proposed method are explained on the example of executing Soi cell element,

in Fig. 2 - sheet metal multilayer structure and

in Fig. 3 - contact metal sheet having a multilayer structure with a sheet, made mainly of homogeneous steel.

In Fig. 1 shows a cell element 1. This cell element 1 consists of a heat - and corrosion-resistant metal sheets, typed in the package and rolled. Cell element 1 is made of two types of metal sheets 2, 3, distinguished by its structure, and it consists of alternating layers of smooth 2 and 3 corrugated sheets. Smooth sheets 2 are made of homogeneous steel containing at least chromium and aluminum. Corrugated sheets 3 have a multilayer structure. Corrugated multilayer sheets have 3 inner layer 4 of chromium steel, on which both sides suffered layers 5, 6, containing mainly aluminum, as seen in Fig. 2. Cell element 1, made of typed in the package and rolled metal sheets, has a structure forming channels 7 for the passage of fluid. The metal sheets are arranged in a tubular casing 8. On the inner surface of the tubular casing 8, at least on its separate parts, there is a layer sostoyaschem 3. Corrugated sheet 3 has a multilayer structure, as shown in Fig. 2. In the heat treatment process, due to which the result of diffusion sheets 2, 3 at the same time are connected to each other in their contact layer 6 is fused to the inner layer 4, a corrugated sheet 3. Molten layer 3 wets the surface of the leaves, and in the result of the capillary effect in the space 9 of the contact portion of the aluminum fills in the gaps 10 between the corrugated sheet 3 and a smooth sheet 2. During the heat treatment, the aluminum diffuses into the smooth sheet 2 and the inner layer 4, a corrugated sheet 3. The formation of zones 11, 12 with a high content of aluminum. Stale-aluminum alloys have a much lower melting point than steel, making the inner layer 4, a corrugated sheet 3 and a smooth sheet 2 in zones 11, 12 are temporarily melted, forming in the surrounding space 9 of the contact area of the internal connection, which in its properties essentially corresponds to the welded joint. Due to the concentration gradient of the aluminum migrates in the direction of the arrows next to the inside of the sheets 2, 3, causing the aluminium content in the zones 11, 12 is reduced, and for this reason, the temperature of the invention can be produced at low cost and with high quality, including large diameter, greater than 90 mm, in particular greater than 105 mm or even 120 mm

1. A method of manufacturing a cell element (1) typed in the package and/or rolled metal sheets (2, 3) with high corrosion and heat resistance, which at least some sections have a structure forming channels (7) for the passage of fluid, wherein the cell element (1) roll to roll or type in a package of two types of metal sheets (2, 3), differing in their structure, with metal sheets (2) of the same type are made of homogeneous steel containing at least chromium and aluminum, and metal sheets (3) of the other type have a multilayer structure including at least one layer (4) made of chromium steel, and at least a second layer (5, 6), containing mainly aluminum, and metal sheets (2, 3) are connected to each other by heat treatment, and the metal sheets of the multilayer structure homogenizers due to the diffusion.

2. The method according to p. 1, characterized in that the mobile element (1) made of alternating layers of alternating smooth and corrugated sheets (sootvetstvenno structure.

3. The method according to p. 1, characterized in that the mobile element (1) made of alternating layers of alternating smooth and corrugated sheets (2, 3), and corrugated sheets (3) are made of a homogeneous material, smooth leaves (2) have a multilayer structure.

4. The method according to PP.1, 2 or 3, characterized in that the sheets (3) with a layered structure are three layers, namely an inner layer (4) of chrome steel, on which both sides suffered, preferably nabalitaan containing mainly aluminium layer (5, 6).

5. The method according to PP.1, 2, 3 or 4, characterized in that the sheets (2, 3), before or after coagulation in a roll or packaging supply at least some areas of the solder, and heat treatment is the process of soldering.

6. The method according to PP.1, 2, 3 or 4, characterized in that the sheets (2, 3) in the heat treatment process due to the diffusion at the same time are connected among themselves in places (9) of their contact.

7. The method according to any of the preceding paragraphs, characterized in that the sheets (2, 3) during or after coagulation in the roll is inserted into the tubular casing (8) with such a preload that reducing the amount of sheets (3) with a layered structure compenser the mi (2, 3) do not disagree.

8. The method according to any of the preceding paragraphs, characterized in that at least part of the sheet before folding into a roll or packaging supply additional microstructure.

9. The method according to p. 8, characterized in that the microstructure is a structure, passing transversely channels (7).

10. The method according to p. 8, characterized in that the microstructure of the structure is held essentially parallel to the channels.

11. The method according to any of the preceding paragraphs, characterized in that the mobile element (1) is inserted into the tubular casing (8), the inner surface of which at least some of its parts has a layer consisting mainly of aluminum.

 

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FIELD: production of honeycomb substrates for catalyst converters for two-wheeled or diesel vehicles.

SUBSTANCE: the invention is dealt with production of honeycomb substrates made out metal sheets piled or rolled in a package and minimized to the honeycomb elements used first of all as honeycomb substrates for catalyst converters in the systems of exhaust gas (EG) neutralization. There is a description of a honeycomb element (1) first of all as a honeycomb substrate for a catalyst converter for systems of two-wheeled vehicles exhaust gas neutralization. The honeycomb substrate for catalyst converter consists of some layers of metal sheets (2, 3) packed as a package or minimized in a roll, which are at least on separate sections are structured or profiled in such a manner, that they form for EG flowing channels (4). At that the metal sheets (2, 3) represent the sheets of high-quality steel of more than 0.08 mm thick with a share of aluminum from 6 up to 12 mass % multiplied by 0.02 mm and divide by "d" - thickness of the metal sheets (2, 3). The technical result - a possibility to use metal sheets depending on the share of aluminum in them and their thickness, that allows to use the sheets taken from production process of manufacture of a material subjected to a hot aluminization.

EFFECT: the invention ensures a possibility to use metal sheets for the purpose depending on the share of aluminum in them and their thickness.

5 cl, 1 dwg

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