MXPA99009642A - Composite member for vehicle bodies - Google Patents

Abstract

A composite vehicle body component, comprising a reinforced plastic foam layer (2) extending up to a flanged outer skin edge (6), is new. A composite vehicle body component comprises a plastic layer (2) which is foamed on the interior face of a deep drawn outer skin (1) and which can have a textile sheet (3) or decorative plastic film on its surface. The plastic layer (2) extends up to a peripheral flanged edge (6) of the outer skin (1) and contains a non-rigid reinforcement over the entire area of the outer skin for increasing its elasticity modulus. Preferred Features:The outer skin (1) may be a vacuum deep drawn, co-extruded double layer thermoplastic film or a hydraulically deep drawn thin aluminum sheet.

Description

CONSTRUCTION PART FOR VEHICLE BODYWORDS DESCRIPTION OF THE INVENTION The invention relates to a prefabricated part of union for vehicle bodies, especially for the roofs of vehicles, corresponding to the introductory idea of claim 1. The prefabricated joint parts formed of According to the present invention, they are suitable for basically all the surface areas of the vehicle body, including the fenders, the doors and the covered flaps, by means of which together with a sufficient resistance to mechanical dents and resistance, as well as resistance to Bending and torsion require good properties with low weight, insulation quality to noise and heat. If we now talk about a vehicle roof or an engine chest, it is precisely a preferred application class of the invention, but without a limiting meaning. To achieve a known roof construction (GM 79 29 367 Ul) the structure indicated in the introductory idea of claim 1, it is first necessary to manufacture a profiled frame of half the object, which is then fixed to the roof covering along its edges in a non-removable manner . The layer of foamed synthetic material also covers the semi-patterned profiled frame, which is non-removably joined to the roof covering. If it is to be made rigid against dents, a roof covering made of a light metal or synthetic material is known from the cited proposition by providing at least one profile strip extending transversely to the semi-stamped profiled frame. The known roof construction requires a high expenditure of material and processing. Correspondingly, it is the same for the prefabricated joining part as for the vehicle bodies known from GB 2 311 966. According to this state of the art an outer shell and an inner shell for the prefabricated joining part are manufactured by means of the injection molded with synthetic material and in a subsequent step are joined together by means of a process of welding of synthetic material or with the help of a glue along its edges in a fixed and hermetic manner. Then the hollow body produced is filled with a hardenable plastic filler. Alternatively, a filler body can also be prefabricated, which is inserted between the outer shell and the inner one, when these are joined together. For the requirements of high mechanical strength, rigidity parts made of aluminum are provided between the outer shell and the inner shell, where the outer shell is formed with channels to receive the stiffening parts. Finally, bonding material ceilings (DE 32 02 594 C2) are also known, which are made of an outer air and rain tight layer of a structural layer / layer of stretched honeycomb structure with aluminum rods or cardboard or structure of fleece and semi-hardened foam, of a semi-rigid porous internal layer and of an ornamental layer and / or decoration by means of a hot pressing process. The invention proposes the task of preparing a construction part sufficiently rigid but light in comparison with the state of the art of this type, for the vehicle bodies, which can be produced easily. The established task is solved by the characteristics indicated in claim 1. Advantageously and or in accordance with other formations for the purpose pursued part of the subclaims (2 to 25) and then explained in the same way. According to the invention, a prefabricated part for joining a vehicle body has a cassette deeply embossed and foamed on the inner side of the outer cover. That in its surface or optionally this provided with a textile superficial conformation or a sheet of decorative synthetic material, the outer cover being built on its edges without frames and with a peripheral edge where the layer of foamy synthetic material reaches up to the edge and in the layer of foamed synthetic material is provided over the entire joint surface of the outer layer in a frame not rigid, by means of which the modulus of elasticity of the layer of foamed synthetic material is raised. By means of the measures according to the invention, a prefabricated connection part for vehicle bodies is achieved, which is carried out without profiled elements for the frame and the additionally complicated strips, however due to the reciprocal effect of the outer cover and the outer layer of the frame. synthetic material is obtained a resistance to fertilization and a joint strength that is sufficient for all the requirements of the stability of shape of the construction part or roof of the vehicle in all the operating requirements of the vehicle. The non-rigid reinforcement provided by the invention within the layer of synthetic material allows an effective reinforcement of the layer of synthetic material up to the edge area of the outer layer which is especially constructed with a peripheral edge. As the framework, non-rigid or flaccid flexural materials are considered as fabrics, knitted fabrics, fleeces, mats, grids or the like of for example glass, synthetic material (for example polyester or aramid) and / or carbon fibers under consideration, as long as the shape of the outer cover can be adjusted up to its edge areas and penetrate the synthetic material in the closed foaming tool, and can be wrapped. Preferably according to claim 2, however, fiber material will be used for the formation of the framework, which is placed as sections of fiber length in a uniform distribution, but in a disordered position of the layer of synthetic material. An especially good result provides the use of an armor of fiberglass material according to claim 3, which is presented in longitudinal sections of twisted glass fiber bundles of about 4800 tex between about 12. 5 mm and about 100 mm of long. The modulus of elasticity of the foamed synthetic material that without this reinforcement has an approximate value of 300 N / mm2 can be raised according to claim 4 with the introduction of a fiberglass reinforcement by 25% in the total weight of the foam of synthetic material reinforced to more than 1600N / mm. The fiberglass materials can be used according to claim 5 in longitudinal sections of different length, where by the use of two different lengths with a greater fraction of those of the shorter length according to claim 6 approximately two thirds of the amount of fiberglass gets a good armor result. Longitudinal sections of a single length can also enter into the frame of the longitudinal section given in claim 3 according to claim 7 in use. The metallic materials are suitable for the outer layer as aluminum or steel sheet, but also the use of an outer layer stamped deep under vacuum of a sheet of thermoplastic synthetic material, Preferably a two-layer coextrusion sheet according to claim 8 produces a vehicle roof of outstanding stability. The coextrusion sheet preferably consists of the materials given in the claim 9, properly PMMA for the outer layer as well as a mixture of PC and ASA for the inner layer and presents the given layer thickness ratios according to which the thickness of the outer layer is preferably about 15% of the total thickness of the outer shell. For example, if the co-extrusion sheet thickness is approximately 20 mm, approximately 0.2 mm will be removed from the outer layer. The use of a sheet of synthetic material also offers the advantage that according to claim 10 in the mass it can be pigmented in the desired color, so that the prefabricated part of union or roof of the vehicle subsequently does not need to be treated with lacquer. As indicated in claim 11 the sheet of synthetic material can obtain a very bright surface by means of the use of a deep stamping mold of a high polish of high gloss in the manufacture of the shell-shaped outer shell or by a calendering previous a granulated surface. If the outer cover according to claim 12 is formed from a thin aluminum sheet, this thickness, thanks to the layer of synthetic material formed, can be very low in the interest of a weight saving preferably approximately 0.6 mm for the outer cover is especially The aluminum alloy given in claim 13 is suitable (AlMg 0.4 Si 1.2). In the use of an aluminum sheet as a material for the deep-drawn outer cover, the sheet can, before being formed with a deep hydraulic stretch, be provided with lacquer in the desired color and be provided with a protection sheet, as indicated in claim 14. , as shown after the removal of the protection sheet. The plate structure can be multi-layered to realize the modeling of the aluminum sheet without cracks or special damages. On a first layer based on epoxy resin of approximately 5 to 7 microns thick, a thickness of polyester-based lacquer of approximately 18 to 23 mm thickness can be applied, which can again be covered by a layer of clear lacquer made of PVDF of a thickness of 22 microns. The burning temperature for a lacquer structure of that multi-layered type is about 240 ° C. The shaping of hydraulic deep stamping of the aluminum foil finished with the lacquer can be carried out in several stages, for example between stages. The deep stamping speed of 60 mm / s has been shown to be non-damaging to the lacquer structure. According to claim 15, the outer edge of the outer cover is transformed before the edge cut into an outwardly angled peripheral flange edge, where the layer of reinforced synthetic material is guided along the edge to the edge of the flange . The edge cutting of the construction part is removed by contour milling or laser cutting of the peripheral peripheral edge and the outer area of the edge of the outer cover as well as the layer of synthetic material assembled in the region attached to the previous one that falls. After cutting, an important edge edge remains for the mechanical strength of the outer cover and the reinforced plastic layer on the edge edge. The edge cutting is also conducted on the edge edge as well as the layer of reinforced synthetic material, which produces a cutting surface, which in a conformation as vehicle roof can be placed directly on the roof frame that It is in the body of the vehicle. Claim 16 hereby provides a shaping variant for the peripheral edge that is transformed from a circular flange edge angled outwardly on the inner side of the outer cover of a full width sealing bearing. To seal between the lower part and the upper part the foaming form. In this variant of conformation, the edge cuts indicated after the foaming process disappear completely. Much more can be achieved by means of the deep stamping of the outer cover or in a subsequent step to the edge of the peripheral flange which is angled outwards., stagnant or cut in a fine manner for the formation of a defined geometry of the outer cover. The peripheral flange edge in the next foaming process with a flat support ensures that sealing of the foam mold is advantageously made for a good and clean sealing of the mold or foam form. Precisely it is possible, that the outer cover present before the foaming process only a peripheral edge, without an angled flange edge outward, which optionally has already been removed. However, sealing of the foamed form is more difficult, in particular the edge of the edge cutting can have a negative influence on the residence time of the sealing of the foam form. According to a particularly advantageous embodiment of the prefabricated joining part according to claim 17, a sealing is fitted on the edge of the deep stamped outer cover, which has a U-shaped cross-section of two branches, where the internal branch of the sealing is foamed in the layer of synthetic material while the external branch forms the sealing surface. The result is the prefabricated joining part after foaming of the layer of synthetic material provided on the inner side of the outer cover, already advantageously, with an integrated sealing, which seals the prefabricated part against the parts prefabricated limiting body, without other work steps are needed, for example the fitting of a sealing already prepared separately on the prefabricated part of union, which brings more savings in cost. This embodiment also offers the additional advantage that the sealing already in the foaming process can be sealed between the lower part and the upper part of the foam form, as indicated in claim 18, so that in this place it is not It needs to provide no sealing in the shape or foam mold, which by repeated use would wear out.

The layer of synthetic material consists as claimed in claim 19 of a PUR foam, which consists of a polyol and an isocyanate in a given mixing ratio, properly approximately 1 to 2. The mixture of the two components of synthetic material with The glass armor is made according to an LFI procedure (Long Fiber Injection = long fiber injection). The mass of glass fiber / liquid synthetic material mixed in the mixing head is on the deep stamped exterior cover that is placed in ('the bottom of the foaming tool with its inner side facing upwards, starting approximately in its central part by means of a spiral path, before the upper part of the tool is brought to the position corresponding on the lower part of the tool, depending on the thickness of the synthetic layer The foamed foam fills the mold and penetrates to the edge area which later optionally has to be cut from the outer cover, if necessary, up to the edge peripheral of 20 the outer cover. If a sheet of synthetic material is used, the inner side of the outer cover according to claim 20 prior to the placement of the foaming synthetic material is subjected to fire for activation, whereby a remarkable bonding of the outer cover is realized. with the layer of foamed synthetic material. In case a decorative surface shape is applied to the surface of the foamed plastic layer, it can be made of the chosen materials according to claim 21 and placed in the foam mold on the outer cover on its opposite side to the layer of synthetic material, so that a fixed connection is reached between the layer of foamed synthetic material and the decorative surface shape. It is advantageous for the intended purpose that the decorative surface shape extend beyond the upper part of the foaming tool, which by this one taken in the foaming position and remains after removal of the upper part of the tool or mold on the layer of foamed material. synthetic material. In the use of a porous decorative surface shape, it is provided according to claim 22 that the surface form is structured in several layers, where the surface form is provided with a blocking layer opposite the layer of synthetic material, which prevents a step of the synthetic material through the pores of the decorative shape and its visible area. The prefabricated connecting part can advantageously be provided with other functional elements even during the foaming process. Thus the claim 23 established in a construction part for especially a vehicle roof, whose outer cover has an opening, where on the side of the layer of synthetic material opposite the outer cover foaming a guide profile for a sliding cover. According to claim 24, it is also possible to foam on the side of the layer of synthetic material opposite the outer cover and in the foaming process to foam a noise-absorbing surface structure on the back, thereby allowing the insulation properties to be further improved. of noise in a simple manner of the prefabricated joint part for the formation of for example engine coffers. Instead of or in addition to this it can be realized that the measurements that relate to the macrogeometry of the surface of the plastic layer also produce the microgeometry conformation of the side of the joining part opposite the outer covering that it is required for the isolation of the noise, in accordance with which a partial buffer zone with a reduced density of the foamed material is foamed on the side of the synthetic layer opposite the outer cover. This foaming of the buffer zone in the synthetic layer is preferably carried out for the purpose pursued in a second washThis is, after foaming of the synthetic layer on the inner side of the outer cover, the buffer regions are foamed in a subsequent step in the layer of synthetic material. The invention will now be explained by means of preferred embodiments with reference to the accompanying drawing, in which like reference numerals indicate equal or corresponding parts. Sample: Figure 1 is a fractional cut through the roof edge area of the vehicle that is in the foamed mold, according to a first example of the invention, Figure 2 is a fractional cut through the area of edge of a finished vehicle roof, Figure 3 is a fractional cut through the edge area of a vehicle roof equipped to be a movable roof that is in a closed foamed mold according to a second exemplary embodiment , Figure 4 a fractional section through the edge area of a vehicle roof that is in a closed foaming mold according to a third example of the embodiment, Figure 5 is a fractional cut through the region of edge of a vehicle roof that is located in a foam mold according to a fourth embodiment of the invention, Figure 6 is a fractional cut through the edge region of the vehicle roof. mined according to the fourth variant, which is mounted in a roof frame, Figure 7 is a schematic perspective view of a motor chest already placed in a passenger car body according to the invention; and Figure 8 a broken section of the engine hood corresponding to the line AA in Figure 7. In Figure 1 and 2 an outer cover 1 stamped deep, a layer of foamed synthetic material 2 on the inner side of the inner cover and a decorative shape 3 that is on the visible side of the vehicle roof. In Figure 1 is the roof of the vehicle turned with its internal side up for the foaming process, while in Figure 2 the roof of the vehicle is represented in its mounting position. In FIG. 2, a roof frame or frame 4 of a vehicle body and a cover 5 for the roof frame 4 are schematically shown in dashed lines. The roof of the vehicle is seated in the roof frame 4 from above and is attached in a known manner, but not represented. The outer cover 1 is at its edges, of which only one edge is represented in Figures 1 and 2, but indicating the others, it is provided with a peripheral edge 6, which in the examples of embodiment, is first presented for the manufacture of the roof of the vehicle a height greater than (Figure 1) that of the edge cuts (Figure 2). As seen from FIG. 1, the circumferential edge 6 extends beyond the periphery flange 7 angled outwards, which here, as an important part of the edge 6, will be removed in the subsequent edge cutting process, as can be seen by comparing the FIGS. 1 and 2. The foaming mold shown in Figure 1 consists of a deep embossed outer cover which is taken with a form closure by the lower part 8 and an upper complementary part 9, in whose edge region a sealing is disposed. 10 peripheral, which takes care of limiting the synthetic material that forms the foaming of the layer of synthetic material 2. The surface curtain form 3 is fixed in the tensioned form by means of a tension frame 12 which is formed in a groove 11 of the upper part 9 surpassing the upper part 9 of the foaming mold. In the manufacture of the roof of the vehicle, the outer cover 1 is first stamped deep, in the case of the use of a sheet metal material, by several stages of hydraulic deep stamping and in the case of using a sheet of synthetic material by a stamping deep to the vacuum in a corresponding tensioning of the edge of the sheet. In the latter case, both sides of the sheet of synthetic material to be pressed deep by heating elements are heated to a surface temperature of approximately 180 ° C. The sheet of synthetic material thus heated is subjected to a process of stamping in deep vacuum. The pre-molding by deep stamping of the outer cover 1 is then carried out with its internal side pointing upwards in the lower part 8 of the foaming form shown in Figure 1, where the foamable synthetic material is applied in the manner described above on the inner side of the outer cover 1. In the case of a sheet cover made of synthetic material, they can be previously activated by flame. As the synthetic foam material, for example, a foaming system of Elastogran, consisting of Polyol B 237 and isocyanate E 3509, is used, where these two components are used in a mixing ratio of 10 parts of polyol to 210 parts of isocyanate. After the application of the foamable plastic mass according to the LF method, the upper part of the mold 9 with the fixed surface shape 3 is placed in its position, where the foamed synthetic material loaded with glass fibers will fill the entire space free from the foaming mold until the upper side of the flange edge 7 and there will be limited by the blown seal 10.

For example, 3.7 kg of foam plastic components are mixed with 1 kg of glass fibers, which corresponds to a fraction of glass in the lower foam 25 material. The roof of the vehicle found in the model of foamed in Figure 3 according to the second embodiment example should be described below only in view of the first example, in its characteristics different from said example. Together with the outer peripheral edge 6, in this embodiment, the outer cover 1 also has an internal peripheral edge 13, which in the same direction as the edge 6 is angled, and in the finished state of the roof of the vehicle limits an opening in the roof, which by means of a movable lid can be covered at will. The layer of synthetic material 2 assembled as described extends to the edges 6 and 13, whereby the vehicle roof obtains sufficient rigidity. Furthermore, it must be recognized that in the state existing in the foaming mold, a flange edge angled inwards or outwards is not connected to the edge 6 or to the edge 12. Here an internal and external edge cut of the outer cover 1 is made, in which also after the deep stamping process the flange edges given in the still existing case of the outer cover 1 are removed, before the outer cover 1 is placed on the bottom 8 of the foam mold. Preferably or for the intended purpose, the edge 6 of the outer cover 1 placed in the lower part of the foaming mold can protrude slightly over the lower part 8. After introducing and placing the outer cover 1 in the lower part 8 of the foaming mold, a guide profile 14 preferably made of an aluminum alloy pressed on a rope, which is part of the foaming mold, is likewise introduced into the lower part 8 of the foaming mold. constitutive of a mechanism for displacing the displaceable cover. This guide profile 14 connected in alignment with the edge 13 in the closed state that is represented of the foaming mold, limits the hollow space of the foaming mold to be filled by the foaming synthetic material, where the guide profile 14 is fixed completely indesplazable with a post 15 between the lower part 8 and the upper part 9 of the foaming mold. In order to prevent, during the foaming process of the foamed synthetic material loaded with glass fibers, it crosses or leaves between the lower part 8 and the upper part 9 of the foaming mold, there are preferably EPDM seals 16 with a suitable cross section at the ends of the foaming mold. the edges 6, 13 and in the end sections 17, 18 of the guide profile 14 in the lower part 8 or in the upper part 9 of the foaming mold. Finally, by means of a suitable shaping of the upper part 9 of the foaming mold, a groove 19 and a bearing surface 20 are also produced as functional sections of the vehicle roof in the foaming process. The slot 19 serves in the assembly of the modular vehicle roof in the vehicle to take a backward glue fold, by means of which the roof of the vehicle is fixed to the roof frame by the vehicle side, while the surface 20 in the assembled state of the vehicle roof lies in a defined manner on the roof frame. In the finished state of the roof of the vehicle, the guide profile is foamed flat in the layer of synthetic material 2, so that the guide profile 14 is fixedly fixed to the roof of the vehicle, without the need for other fixing means. . It is also particularly important that this pre-equipped vehicle roof for a sliding cover due to its formation with the peripheral edges 6, 13 of the outer cover and the layer of synthetic material 2 assembled as described is intermediate stretchable, is completely realized without the usual reinforcing frame in the prior art, around the opening of the roof and in the usual manner the guide profiles for the movable cover are fixed.

The third embodiment example shown in Figure 4 differs from the second explained by Figure 3, because the edge 6 of the outer cover 1 is transformed into a peripheral flange edge angled upwards 21. In opposition to the first embodiment of According to FIG. 11, the flange edge 21 is so short that during the foaming of the reinforced plastic layer 2 on the inner side of the outer cover 1 the seal 16 on the upper part 9 of the foamed mold extends in flat form over the entire width of the flange edge, since the flange edge 21 thus rests on the lower part 8 of the foamed mold, in which this closed form of the foaming mold will press the flange edge into the sealing 16. As As a result, the foaming mold for the foaming process will be sufficiently sealed between the lower part 8 and the upper part 9, without there being any danger, that the canopy 6 or the flange edge 2 1 damage the seal 16. Also in this embodiment, an edge cut of the outer cover 1 is made before it is placed in the lower part 8 of the foaming mold. The edge cut can be made simultaneously with the deep stamping of the outer cover 1 or in a subsequent step by cutting the mechanical or thin cutting. In the fourth exemplary embodiment shown in FIGS. 5 and 6 on the peripheral edge 6 of the outer cover 1, an equally peripheral sealing is fitted, essentially having a U-shaped cross section of two branches. According to FIG. 5, the sealing is already foamed during the foaming of the synthetic layer 2 on the outer cover, the cut edges 1 with the layer of synthetic material 2, and precisely with its internal branch 23, which in any case more extends over a part of the total height of the edge 6, whereby the layer of reinforced synthetic material 2 can also reach up to the edge 6. In the foaming process the sealing 22 advantageously serves as a sealing element between the lower part 8 and the upper part 9 of the foaming mold. As it is recognized in Figure 6, the external branch 24 of the sealing 22 forms in the state of mounting the vehicle roof to the body of the vehicle, a sealing surface for sealing between the vehicle roof and the roof frame or frame 4. On the other hand, the external branch 24 of the sealing 22, due to its elasticity, has a centralizing effect on the roof of the vehicle with respect to the roof frame. Sealing 22 generally consists of a material of which it is especially thermally and mechanically resistant with respect to the stresses in the foaming mold and in the mounted condition of the vehicle roof in the vehicle having sufficient strength, for example Moosgummi or EPDM. Figure 6 shows finally finally how the roof of the vehicle by means of a protuberance of additive material 25 received in the slot 19, is connected with the roof frame 4 of the vehicle body. It was already mentioned at the beginning that not only roofs of vehicles can be manufactured but also any flat area of the bodies of the vehicles by means of the prefabricated joint parts constructed as described. Examples of this are presented in Figures 7 and 8 where an engine hood is shown, whose outer cover 1 'deep-stamped is constructed at its edges without a frame frame provided with a peripheral edge 6' on the inner side, where the layer 2 'of synthetic material foamed on the inner side of the cover 1' is provided over the entire flat or surface area of the outer cover 1 'with a reinforcement itself, not rigid, reaching up to the peripheral edge 6'. Furthermore, in FIG. 8, measures are shown, which still improve especially the noise-insulating properties of such prefabricated joining parts. Thus correspondingly slot 19 with reference to the examples explained with Figures 3-6, this is by an adequate formation of the upper part of the foaming mold already during the foaming of the synthetic layer 2 'on the inner side of the outer cover 1' on the side opposite the outer cover 1 ', it can foam behind the synthetic material layer 2 'a noise absorbing surface structure 26', which in the example shown here has a multiplicity of grooves 27 'which influence the reflection of the noise. It is also possible, on that side of the layer of synthetic material 2 'opposite the outer cover 1', in a second pour to foam the buffer zone 28 'with a decreased density of the PUR foam material, where a porous microstructure can be achieved or open cells of the surface. A prefabricated joint part is proposed, especially a vehicle roof, consisting of a deep-stamped outer cover made of sheet metal or sheet of synthetic material and a layer of foamed synthetic material on the inner side of the outer cover. The layer of synthetic material has an internal reinforcement, through it an introduction of fiber material is made in a uniform distribution, preferably glass fiber, which gives the prefabricated joint part in conjunction with the effect of the outer cover Shape stability and outstanding mechanical strength. Here it is essential that the layer of synthetic material reinforced with fibers also reinforces an edge edge of the outer cover 1.

Claims (25)

1. CLAIMS 1. Prefabricated joint part for vehicle bodies, especially for vehicle roofs, with a deep stamped exterior cover and a layer of foamed synthetic material on the inner side of the outer cover, which may be provided on its surface with a textile surface formation or a sheet of decorative synthetic material, characterized in that the outer cover on its edges is formed without frame or frame and is provided with a peripheral edge the layer of synthetic material reaches up to the edge, and has been provided in the layer of synthetic material throughout the surface area of the outer shell a non-rigid reinforcement itself by means of which the modulus of elasticity of the layer of foamed synthetic material is increased. The prefabricated joint part according to claim 1, characterized in that the reinforcement is made of fiber material, which has a uniform distribution in the length sections of the fibers, but has a disordered position in the layer of the material synthetic The prefabricated joining part according to claim 2, characterized in that the reinforcement is formed of fiberglass material of approximately 4800 tex in a length between approximately 12.5 mm and 100 mm. 4. The prefabricated joining part according to claim 3, characterized in that, the fraction of glass fiber in reference to the total weight of the foam of the synthetic material is between approximately 20 and 30 ?; by weight, preferably about 25% by weight. The prefabricated joint part according to claim 3 or 4, characterized in that the longitudinal sections are formed with several different lengths. The prefabricated joint part according to claim 5, characterized in that the length sections are formed of a short length and a long length where approximately two thirds of the glass fiber amount consists of the short length. The prefabricated joining part according to claim 3, characterized in that the longitudinal sections have a single thermoplastic length. The prefabricated joint part according to one of the preceding claims, characterized in that the outer cover is formed by deep vacuum printing from a two-layer co-extrusion sheet. 9. The prefabricated joint part according to claim 8, characterized in that the outer layer consists of polymethyl methacrylate (PMMA) and the inner layer of a mixture of polycarbonate and copolymerized ester of acrylonitrile-acrylic ethyrole, where the thickness of the outer layer is between 10 to 30% of the total thickness of the outer covering, preferably approximately 15% of the total thickness. The prefabricated joint part according to one of claims 8 or 9, characterized in that the two layers of the coextrusion sheet are colored in the desired color in the mass. The prefabricated joint part according to one of claims 8 to 10, characterized in that the outer layer has a glossy surface by means of a deep-stamping molding with high-gloss polishing, or by calendering it presents after the extrusion a texture surface. The prefabricated part according to one of claims 1 to 7, characterized in that the outer cover is formed by deep stamping from a hydraulically thin aluminum sheet and has a thickness of approximately 0.5 to 0.8 mm, preferably 0.6 mm. The prefabricated joint part according to claim 12, characterized in that the aluminum sheet consists of an aluminum alloy of the composition AlMg 0.4 Si 1.
2. 2. The prefabricated joint part according to claim 12 or 13, characterized in that the aluminum sheet is finished by lacquering in the desired color and a protection sheet is provided and for the formation of the outer cover is stamped deep. 15. The prefabricated joint part according to one of the preceding claims, characterized in that the edge of the outer cover before the cut or edge section is transformed into a peripheral flange edge angled outwards, where the synthetic layer is inserted in the edge along the edge of the flange. The prefabricated joint part according to one of claims 1 to 14, characterized in that the edge of the outer cover is transformed into an outwardly angled peripheral flange edge in which when the plastic layer is foamed on the side internal of the cover. The exterior establishes a flat sealing over its entire width, to seal between the lower part and the upper part of the foaming mold. The prefabricated joining part according to one of claims 14, characterized in that a sealing is inserted on the edge of the outer cover, which has a substantially U-shaped cross section of two branches, where the internal branch of the sealing is foamed in the layer of synthesized material while the external branch forms the sealing surface. 18. The prefabricated joint part according to claim 17, characterized in that the sealing on the foaming of the synthetic layer on the inner side of the outer cover is the sealing element between the lower part and the upper part of the foaming mold. 19. The prefabricated part according to one of claims 1 to 14, characterized in that the layer of The synthetic material consists of a PUR foam formed of a polyol and an isocyanate in a mixing ratio of about 1 to 2. The prefabricated joining part according to claim 19, characterized in that in an outer covering made of a sheet of synthetic material, this is subjected to the activation to a flaming on its internal side before placing the foamable synthetic material. The prefabricated joining part according to one of the preceding claims, characterized in that a decorative surface shape selected from the group of woven materials is placed on the side of the synthetic layer opposite the outer cover in the foaming mold. , knitted fabrics, fleeces, grids sheets made of synthetic or metallic material. 22. The prefabricated joint part according to claim 21, characterized in that in the use of a porous decorative surface form this is provided with a blocking layer in front of the layer of synthetic material. 23. The prefabricated joint part according to one of the preceding claims, characterized in that the outer cover has an opening and on the side of the plastic layer opposite the outer cover is foamed a guide profile for a sliding cover that closes the opening at will. The prefabricated joint part according to one of the preceding claims, characterized in that on the side of the layer of synthetic material opposite the outer cover, a noise-absorbing surface structure is foamed from behind. 25. The prefabricated joint part according to one of the preceding claims, characterized in that On the side of the layer of synthetic material opposite the outer cover, partial buffer zones are foamed with a reduced density of the foamed material. •