EP2088293A1 - Method for producing an assembly, containing a component with an isolation and such an assembly - Google Patents

Abstract

The method involves arranging a high pressure-exhaust gas recirculation-cooler (15) in a high pressure-exhaust gas recirculation-pipeline (56), and connecting an exhaust gas-particle filter (8) with an exhaust gas-outlet (95) of an internal combustion engine (1). An exhaust gas temperature is determined by using an exhaust gas temperature-sensor (9) when a regeneration of the particle filter is released by a regeneration-releasing device. A bypass-valve of the cooler is opened when the exhaust gas temperature in a regeneration phase lies below a constant limit value.

Description

The invention relates to a method for producing an arrangement, comprising a component with an insulation, according to the features indicated in the preamble of patent claim 1. Furthermore, the invention relates to such an arrangement.

From the EP 1 840 350 A2 an arrangement of the type mentioned is known, the component is designed in particular as an exhaust pipe of an internal combustion engine or an engine and by a hot medium, namely the exhaust gas, can flow. The component is at least partially surrounded by an insulation or covering device for the purpose of thermal and / or acoustic insulation. To determine the insulation with respect to the component and the motor or other unit, a fastening device is provided, which is expediently designed as a clamping device, wherein advantageously a spring-elastic element is provided. This arrangement has been proven for many applications, but the required manufacturing and manufacturing effort is less appropriate in other applications.

On this basis, the invention has the object to further develop the method and the arrangement with a low design effort to that the production and / or attachment of the insulation on the component can be carried out in a simple manner, while nevertheless a functionally reliable and / or the requirements of practice-fulfilling attachment should be achieved. Especially with regard to high volumes, such as in automotive technology or engine construction, the production with constant and / or reproducible quality should be feasible. The time and / or assembly effort in the preparation of the arrangement and / or the connection of the insulation with the component, in particular with regard to the correct positioning of the insulation with respect to the component, to be reduced.

The solution of this object is achieved with regard to the method according to the features specified in claim 1. With regard to the arrangement, the solution is carried out according to the claim directed to the arrangement.

The manufacturing method according to the invention allows the determination and connection of the insulation on the component with little effort, which in particular by a hot medium, such as exhaust gas, can flow. The component contains recesses formed in particular as cutouts, to which corresponding characteristics of the insulation are assigned. The characteristics of the insulation engage in the recesses of the component, whereby an exact positioning and alignment of the insulation is ensured with respect to the component during assembly. Previously, the recesses are advantageously introduced into the outer surface of the component, in particular by milling predetermined areas of the outer surface of the component. The recesses, which can also be referred to as Zentrierfräsungen are advantageously carried out with the same system or machine, with which predetermined parts or areas of the component are processed. The particular manufactured by a casting process and / or as a casting, preferably made of metal, existing component is machined in a known manner, in particular by grinding and / or milling at predetermined areas. Mentioned here are, for example, for connection to an aggregate or an internal combustion engine provided areas or parts, which are preferably processed by grinding and / or milling, in particular to equalize the casting surface and / or remove scale skin, according to the invention also said recesses in the Surface and / or outer surface of the component are introduced. The recesses, which are also referred to below as milling or Zentrierfräsungen are preferably produced by means of a special milling, for example, a five-axis milling machine, and in an advantageous manner in the machining and / or machining operation, with which in particular flanges and / or holes are processed, which are provided for attachment and / or connection of the component to the unit. It should be expressly stated that the recesses are introduced into the component not only in the context and / or in the area of the aforementioned flanges or bores or the like, but additionally or alternatively on or in such areas of the outer surface and / or surface of the component, which allow a predetermined positioning of the insulation in combination with their characteristics.

In the inventively given connection regions of the insulation with the component said recesses are arranged, and by the removal and / or grinding and / or milling of the surface and / or outer surface of the component this is prepared for the production of a welded joint with the insulation. The insulation formed as a molded part, which is preferably constructed of at least two partial shells or half shells and / or is formed as integral insulation and preferably has film half shells, in particular stainless steel foil half shells, contains the said with the recesses of the component corresponding and engaging in these forms. After positioning the insulation, in particular by spot welding, the firm connection between the insulation and the component is produced, with consistent and / or reproducible quality due to the previous preparation of the surface and / or outer surface of the component in the connection area or the milling or grinding the casting surface and / or the scale skin. Preferably, the welded joint or welded joints are made in particular by spot welding, in the recesses of the component and in the latter intervening forms of isolation. The production of the welded joints, preferably by spot welding, can be carried out in a simple manner and with high precision, preferably by means of automatic welding machines, whereby a functionally reliable and permanent fixing of the insulation on the component is ensured.

The arrangement produced according to the invention is characterized by a robust and / or highly durable construction. Due to the immediate and / or tight installation of the insulation on the component, which is present in the connection areas with the characteristics and the corresponding recesses, not only is a reliable one Sealing achieved, but also prevents leakage of the usually usual fibrous insulation materials, which are present in the interior of the insulation and / or integral insulation. It should be noted that the insulation, at least the outer sheath and / or inner sheath of metal or metal foils are preferably constructed to form an interior, in which the insulating material or the insulating material is arranged.

In a particular embodiment of the invention, the embossments of the insulation engaging in the recesses of the component are each surrounded by an embossing region which projects beyond the surface of the insulation at a predetermined distance on the side remote from the component. The respective embossing region, as well as the features pointing in the opposite direction, namely towards the component, are preferably produced in the same process step and / or preferred during the formation of the insulation and / or its subshells, adapted to the outer surface of the component to be insulated. By means of the embossing area, an optimized adaptation and / or a secure intervention and / or a functionally reliable welding with the component is furthermore made possible. In that regard, above all, the fact is taken into account that the manufactured by a casting process component has a Gusstoleranz with lower limit and upper limit. The insulation is formed as a molded part and / or adapted to the outer contour of the component, in particular taking into account the upper limit of the casting tolerance. If the component is manufactured in the region of the upper limit of the casting tolerance, then the insulation lies at least in the connection region and / or the region surrounding the recess on the outer surface and / or the scale skin of the component, so that a tight contact of the insulation on the component is achieved , If, on the other hand, the workpiece is manufactured with the lower limit of the pouring tolerance, then after the welded connection has been produced, a tight seal of the insulation on the component is not present at first. In a further step essential to the invention, the insulation is then subsequently stamped in such a way that it bears against the outer surface of the component, an initially existing gap between the insulation and the surface of the component being closed. This also applies equally to those components whose surfaces are within the tolerance range of the casting tolerance. Due to the embossing region projecting in a preferred manner over the surface of the insulation, during springing-on, a spring-back and / or spring-back of the insulation is prevented.

Further developments and special embodiments of the invention are specified in the dependent claims and the following description of exemplary embodiments.

Fig. 1

In perspektivischer und explosionsartiger Darstellung das als Abgaskrümmer ausgebildete Bauteil und die aus zwei Halbschalen aufgebaute Isolation vor der Herstellung der Anordnung,

Fig. 2

vergrößert das Detail A,

Fig. 3, 4

seitliche Ansichten der Anordnung bzw. des Krümmers mit der Isolation,

Fig. 5

eine Aufsicht auf die Anordnung bzw. den Krümmer mit der Isolation,

Fig. 6

schematisch eine Ansicht eines Fräsers und teilweise geschnitten das Bauteil bzw. den Krümmer,

Fig. 7, 8

seitliche Ansichten eines weiteren Ausführungsbeispiels der Anordnung,

Fig. 9, 10

schematisch vergrößerte Detaildarstellungen des Bauteils unter Berücksichtigung der Gusstoleranz zusammen mit einem Teil der Isolation.

The invention will be explained in more detail with reference to the specific embodiments shown in the drawing, without being limited in this respect. Show it:

Fig. 1

In a perspective and explosive representation of the formed as exhaust manifold component and the built-up of two half-shells isolation before the preparation of the arrangement,

Fig. 2

enlarges the detail A,

Fig. 3, 4

lateral views of the assembly or the manifold with the insulation,

Fig. 5

a view of the arrangement or the manifold with the insulation,

Fig. 6

1 is a schematic view of a milling cutter and partially sectioned the component or the manifold,

Fig. 7, 8

side views of a further embodiment of the arrangement,

Fig. 9, 10th

schematically enlarged detailed representations of the component taking into account the casting tolerance together with a part of the insulation.

Fig. 1 shows the formed as the exhaust manifold of a motor component 2 and two partial or half shells 4, 6 of the insulation, which are preferably designed as film half shells, in particular stainless steel foil half shells, an integral insulation. The insulation or its half-shells contain in a known manner as metal foils formed inner walls and outer walls, between which a filled with insulating interior is present. The component 2 contains a predetermined number of recesses 8, which are introduced in particular by milling in the component and / or formed as Zentrierfräsungen. Corresponding and / or analogous to the Recesses 8 contains the insulation, here the half-shells 4, 6, characteristics 10. The insulation and / or its partial or half shells 4, 6 are formed as moldings and adapted at least approximately to the outer contour of the component 2. During the production and / or assembly of the arrangement, the forms 10 engage in the recesses 8 of the component 2. As a result, an exact positioning of the insulation or its half-shells 4, 6 with respect to the component 2 is produced in a preferred manner in the manufacture and / or assembly. Subsequently, the permanent connection of the insulation with the component 2, in particular by welding, preferably spot welding, produced, in particular in the region of each associated and / or interlocking forms 10 and recesses 8. It should be noted that by introducing the recesses. 8 a scale skin initially present on the outer surface of the component 2 formed as a casting is removed, and the connection by welding, in particular spot welding, the insulation to the component 2 is thus produced in the area of the respective recess 8 and in this engaging shape 10 without problems and with reproducible quality , Trained as exhaust manifold component 2 includes in a known manner flanges 14 for connection to the engine not shown here. When positioning the two partial or half-shells 4, 6 whose mutually facing and / or associated edges 17, 18 are brought into overlap and subsequently welded.

In the schematic diagram according to Fig. 2 is the interlocking of the recess 8 of the component 2 and the correspondingly formed and / or arranged expression 10 of the insulation or its half-shell 6 shown schematically. In practice, the corners and edges are suitably rounded or chamfered to avoid peak loads and resulting damage. After positioning the insulation and / or its half-shell 6, in particular by spot welding, the firm connection between the insulation and the component 2 is produced, as indicated by the dotted lines 16.

Fig. 3, 4 show in side views a further embodiment of the inventive arrangement, comprising the component 2 and the insulation or their half-shells 4, 6. The engaging in the connecting regions and / or edge regions respectively in the associated recesses of the component 2 forms 10, as above explained by welding to the component 2 firmly and permanently connected.

According to Fig. 5 the half-shells 4, 6 associated with each other and at least partially overlapping arranged edges 17, 18, which are connected by means of a welded joint 19. The welded joint 19 is preferably designed as a roll seam welding. Furthermore, the welded connection 19 is preferably produced after the placement and / or positioning of the half-shells 4, 6 on the component 2. Furthermore, this welded connection 19 is produced in particular after the welding of the half-shells 4, 6 in the region of the respective recess and the associated expression with the component 2. Thus, deviations are compensated in an advantageous manner, especially as the overlap of the edges 17, 18 is designed to be variable. The insulation 4, 6 is formed as a molded part and has a contour adapted to the outer contour of the component 2, wherein a solid and / or substantially dense system, at least in the edge regions and / or by welding produced connecting regions, a substantially dense system the insulation 4, 6 to the component 2 consists.

Fig. 6 schematically shows a milling cutter 20, with which in the surface 21 of the component 2 partially shown here, the recess 8 is introduced with a predetermined depth 20.

FIGS. 7 and 8 show lateral views of another embodiment, which is essentially the FIGS. 3 to 5 equivalent.

By virtue of the method according to the invention, the insulation 4, 6 is positioned precisely by engaging in the associated and correspondingly formed recesses 8 of the component 2 by means of the forms which are preferably arranged at least approximately in their edge regions. Subsequently, a consistent and / or reliable welding, in particular in the area and / or in the forms and recesses 8 is performed. The recesses 8 and / or centering cuts on or into the component 2 have previously preferably been carried out by means of a special milling machine, for example a five-axis milling cutter, advantageously during machining and / or the machining operation, in particular of flanges and / or Holes, which are provided for fastening and / or connection of the component 2 together with insulation 4, 6 on an aggregate, in particular on a motor. After carrying out the aforementioned welding, in particular in the area and / or in the characteristics, the welded connection 19 the overlapping edges 17, 18 of the half-shells 4, 6, preferably by roll seam welding performed. Furthermore, it should be expressly stated that the recesses 8 and / or milled cuts and / or center milled recesses are introduced not only in connection with the abovementioned connecting flanges, but in connection and / or during the machining of all flanges, bores or the like of the component 2.

FIGS. 9 and 10 show detailed representations in each case in the region of the recess 8 of the component 2, wherein in Fig. 9 by dash-dotted line 24, the lower limit of a Gusstoleranz and in Fig. 10 with dash-dotted line 26, the upper limit of the casting tolerance of the component 2 are entered. The component 2 has on its surface 21 a scale skin 28, which is removed by the introduction and / or milling of the recess 8. Thus, the weld joint 16 can be made directly to the material of the component 2 without being adversely affected by the scale skin 28. As can be seen, the side surfaces 29 of the recess 8 are arranged conically in an advantageous manner in the direction of the bottom 30 of the recess 8, whereby the engagement of the expression 10 for the purpose of positioning the half-shell 6 is facilitated. It is of particular importance that in the production of the expression 10, which is directed in the direction of the component 2 and / or in the recess 8, an embossing 10 surrounding and / or preferably rounded embossed area 31 is generated. This stamping area 31 protrudes beyond the outer surface 32 of the insulation 6 at a distance 34 on the side facing away from the component 2. Thus, the welded connection 16 can be produced reliably, wherein damage to the half-shell or insulation 6, in particular due to a tight abutment against the edge 38 of the recess 8, is avoided.

As further in Fig. 10 represented, is achieved in a particularly advantageous manner that even with a component 2, which is manufactured as a casting at the tolerance lower limit, a close concern of the insulation 6 is made. For this purpose, an embossing force is exerted in the direction of the outer surface 21 of the component 2 according to the arrow 36 on the insulation or half-shell 6 such that outside the embossing region 31, the half-shell 6 on the surface or the scale skin 28 in Essentially tight. In accordance with the invention, there is thus an embossing of the half-shell and / or foil contour corresponding to the surface 21 'produced and / or lying on the cast-tolerance lower boundary 24 in accordance with FIGS dashed lines 40. Due to the embossing provided according to the invention, in addition to the general sealing of the insulation 6 with respect to the component 2 further leakage of the mostly fibrous insulating materials of the insulation and / or its half-shell 6 is largely prevented. It should be expressly stated that for the entire range of the casting tolerance between the upper limit and the lower limit, the stamping of the half-shell 6 and / or the insulation is preferred, in particular in its edge regions with the characteristics 10, which project from the outwardly projecting embossed areas 31 are surrounded, is made to the component 2. The stamping according to the invention is particularly useful in combination with the welded connection 16 in the manner shown, especially since without the welded connection 16 it would not be possible to prevent springing and / or springing back of the half-shell 6 or insulation.

reference numeral

2

Component / manifold

4, 6

Isolation / partial shell / half shell

8th

Recess in 2

10

Expression of 4, 6

12

Border area of 4, 6

14

flange

16

dashed line / welded connection

17, 18

Edge of 4, 6

19

welded joint

20

milling cutter

21

Surface of 2

22

Depth of 8

24

Lower limit of a casting tolerance

26

Upper limit of a casting tolerance

28

scale skin

29

Side surface of 8

30

Bottom of 8

31

stamping area

32

outer surface of 6

34

Distance from 31 to 32

36

Arrow / stamping force

38

Edge of 8

40

dashed line / outer contour of 6 after a re-embossing

Claims (10)

Method for producing an arrangement which contains a component (2) with an insulation (4, 6), wherein the component (2) can in particular be flowed through by a hot medium or is designed as an exhaust pipe,
characterized in that in the component (2) recesses (8) are introduced and the insulation (4, 6) with features (10) is provided, which are provided corresponding to the recesses (8) that the insulation (4, 6 ) is arranged on the component (2) such that the forms (10) engage in the recesses (8) and thus the insulation (4, 6) is positioned with respect to the component (2), and subsequently in the region of the recess ( 8) and the respective associated characteristic (10) a firm connection (16) of the insulation (4, 6) on the component (2) is produced. A method according to claim 1, characterized in that the recesses (8) during machining of the component (2), in particular by milling, are introduced into the component (2). A method according to claim 1 or 2, characterized in that the forms (10) at least partially and / or substantially approximately at edge regions (12) of the insulation (4, 6) are arranged. A method according to claim 3, characterized in that the connection (16) by welding, in particular spot welding, is produced. Method according to one of claims 1 to 4, characterized in that the insulation (4, 6) is formed as a molded part whose inner contour is at least approximately adapted to the outer contour of the component (2) and / or that the insulation (4, 6) essentially and / or at least approximately tightly against the outer surface (32) of the component (2). Method according to one of claims 1 to 5, characterized in that the insulation (4, 6) of at least two partial shells (4, 6) is constructed and / or that the partial shells (4, 6) have a connection region (13) and / or there with their mutually associated edges (17,18) are arranged overlapping and / or that in the connection region (13) is preferably a welded joint (19) of the partial shells (4, 6) is produced. Method according to one of claims 1 to 6, characterized in that at least a part of the forms (10) by a stamping area (31) is surrounded, which on the component (2) facing away from the outer surface (32) with a predetermined distance (34 ) protrudes. Method according to one of claims 1 to 7, characterized in that after production of the welded joint (16), the insulation (4, 6) is subjected to re-embossing in such a way that the insulation (4, 6) otherwise remains substantially close to the surface ( 21) of the component (2), even in cases in which the surface (21) of the component (2) lies in the tolerance range of the casting tolerance and in particular at the lower limit (24) of the casting tolerance. Arrangement, comprising a component (2) which is at least partially surrounded by an insulation (4, 6), the component (2) in particular being able to flow through a hot medium or being designed as an exhaust pipe, characterized in that the component (2 ) Recesses (8) and the insulation (4, 6) have embossments (10) which correspond to the insulation (4, 6) being arranged on the component (2) in such a way that the embossments (10) engage in the recesses (10). 8) engage and thus the insulation (4, 6) with respect to the component (2) is positioned, and that in the region of the recess (8) and the respective associated expression (10) has a firm connection of the insulation (4, 6) on the Component (2) is provided. Arrangement according to claim 9, characterized in that it is made according to one of claims 1 to 8.

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