Automobile roof sunroof port hemming structure

Abstract

The utility model belongs to the technical field of automotive interior, concretely relates to a kind of automobile roof skylight edge covering structure, including roof framework and the fabric layer covered in the front of roof framework, the skylight edge of roof framework is equipped with folding part, the folding part is folded to the back of roof framework and is bonded on roof framework, notch part is equipped on the back of roof framework, the folding part is set in the folding of folding part, and filler strip is equipped at the notch part.The edge covering structure of the utility model is set notch part on the back of roof framework, makes folding mainly occur in flexible foam layer, thereby effectively avoid the wrinkle and internal stress generated when folding due to length difference of back layer glass fiber reinforced layer, eliminate the rebound trend of flanging, increase the thickness of folding place by the cooperation design of notch part and filler strip, ensure that skylight edge edge covering is full and straight, guarantee the form stability of edge covering structure.

Description

Technical Field

[0001] This utility model relates to a roof sunroof edging structure for automobiles, belonging to the field of automotive interior technology. Background Technology

[0002] The headliner is an interior trim piece installed on the roof of a car's passenger compartment, primarily serving to insulate against heat, absorb sound, and enhance the aesthetics of the cabin. As consumers increasingly demand higher levels of beauty in car interiors, the appearance quality of the headliner is receiving more and more attention. To avoid directly exposing the cut edges of the headliner substrate, visible areas such as the sunroof typically require edge banding. Since the sunroof area is easily observed by passengers during vehicle use, the quality of the edge banding in this area is particularly crucial.

[0003] Currently, the edging process for car roofs is mainly divided into two methods: a two-step method and a one-step method. The two-step method first forms the roof frame and cuts the areas to be edged; then, fabric is laminated onto the roof frame, with edging allowance reserved at the corresponding positions, and the fabric is folded to the back to complete the edging (see...). Figure 3 While this process achieves good edge-binding results, it is cumbersome, inefficient, and requires significant mold investment. The one-step process, on the other hand, completes the ceiling frame molding and fabric lamination simultaneously in a single molding cycle. Compared to the two-step process, it offers advantages such as a shorter process and lower cost. However, because the ceiling frame and fabric are molded simultaneously, edge binding often requires folding the entire structure together. To enable this folding, the area to be folded needs to be heated from the back of the ceiling to soften the fiberglass reinforcement and foam layers. Then, a mold is used to press the area below the folding line, and the folding block pushes the fabric and ceiling frame above the folding line outwards before pressing down to form the fold. The fold width should not be too wide, generally controlled at 2-6 times the thickness of the ceiling frame. Furthermore, after folding, the originally neat cut edges of the ceiling frame become staggered (see...). Figure 4 While this staggered structure can make the folded edge more stable to some extent, the need to heat and soften the ceiling frame affects its strength. If the folded edge width is large enough, for example, more than 10 times the thickness of the ceiling frame, the ceiling frame can be folded without heat softening. After folding, the original cut edges of the ceiling frame remain neat and a staggered structure is not formed. However, because the two fiberglass reinforcement layers of the ceiling frame at the fold are of the same length, but one is on the inside and the other on the outside during folding, the fiberglass reinforcement layer on the outside is taut, while the fiberglass reinforcement layer on the inside forms wrinkles (see...). Figure 5 This results in significant internal stress at the fold, causing the folded edge to tend to bounce back and affecting the stability of the edging quality.

[0004] Therefore, the existing one-step edge-wrapping structure still has shortcomings in terms of strength reliability and edge-wrapping quality stability. There is an urgent need for a skylight edge-wrapping structure that is structurally reasonable, can effectively avoid edge rebound, and can guarantee strength. Utility Model Content

[0005] This utility model addresses the aforementioned technical problems in the prior art by providing a roof sunroof edging structure for automobiles.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A sunroof edging structure for an automobile roof includes a roof frame and a fabric layer covering the front of the roof frame. The sunroof edge of the roof frame is provided with a folded portion, which is folded towards the back of the roof frame and adhered to the roof frame. The back of the roof frame is provided with a notch, which is located at the fold of the folded portion.

[0007] Furthermore, a filler strip is provided at the notch.

[0008] Furthermore, the filling strip is a closed structure with its ends connected.

[0009] Furthermore, the ceiling frame includes a surface fiberglass reinforced layer, a foam layer, a back fiberglass reinforced layer, and a back nonwoven fabric arranged sequentially.

[0010] Furthermore, the notch extends from the back of the ceiling frame into the interior of the ceiling frame and penetrates at least the back fiberglass reinforcement layer and the back nonwoven fabric.

[0011] Furthermore, the depth of the notch extends into the foam layer.

[0012] Furthermore, the depth of the notch is 1 / 10 to 9 / 10 of the thickness of the roof frame.

[0013] Furthermore, the filler strip is made of rubber or thermoplastic elastomer.

[0014] Furthermore, the width of the folding section is 2 to 10 times the thickness of the roof frame.

[0015] Furthermore, the folding section is bonded to the roof frame with hot melt adhesive.

[0016] The processing technology of the automotive roof sunroof edge-wrapping structure of this utility model includes: before the folded part of the roof frame is folded to the back of the roof frame, a notch is formed on the back of the roof frame along the folding line of the folded part, and the notch disconnects the back fiberglass reinforcement layer of the roof frame and the back non-woven fabric of the back of the roof frame.

[0017] Specifically, the following steps are included: Step 1: Constructing the ceiling frame: Lay out the various layers of materials for the ceiling frame, from top to bottom: fabric layer, surface fiberglass reinforced layer, foam layer, back fiberglass reinforced layer, and back non-woven fabric, and then mold them. Step 2, Cutting: Cut the areas of the ceiling frame and fabric that need to be edged, leaving folding allowance for the folded part of the ceiling frame; Step 3: Processing the notch: Cut the backing non-woven fabric, the backing fiberglass reinforcement layer, and part of the foam along the fold line at the fold to form the notch. The width of the notch is 0.5 to 2 times the thickness of the ceiling frame, and the depth of the notch is 1 / 10 to 9 / 10 of the thickness of the ceiling frame. Step 4: Lay a filler strip at the gap. The filler strip is a closed structure with its ends connected and is directly filled at the gap.

[0018] Step 5: Apply adhesive: Apply adhesive to the back of the folded part of the ceiling frame; Step Six: Folding: Fold the fabric layer from one side of the folded part of the ceiling frame towards the back of the ceiling frame. Since there is a notch on the back of the ceiling frame, the folding will occur at the notch. After folding, the folded part of the ceiling frame is firmly bonded by the adhesive. The fabric layer forms an edge binding structure at the fold. The filler strip provides support for the fold at the notch to ensure the strength of the fold and make the edge binding fuller.

[0019] The beneficial effects of this invention are as follows: The edging structure of this invention, by setting a notch on the back of the ceiling frame, ensures that the folding mainly occurs in the flexible foam layer. This effectively avoids wrinkles and internal stress caused by length differences in the back fiberglass reinforcement layer during folding, eliminating the tendency for the fold to rebound and ensuring the stability of the edging structure. Furthermore, the design of the notch and filler strip increases the thickness at the fold, ensuring a full and crisp edge for the skylight, significantly improving aesthetics. In addition, this structure achieves a neat fold without heating or softening the ceiling frame, fully preserving the strength of the material itself, giving the edging area higher mechanical strength and durability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the notch portion of this utility model; Figure 2 This is a cross-sectional view of the structure of this utility model; Figure 3 This is a schematic diagram of the existing two-step edge-binding structure; Figure 4 This is a schematic diagram of the edge-wrapping structure using the softened ceiling frame process in the existing one-step method. Figure 5This is a schematic diagram of the edge-wrapping structure in the existing one-step method without using the softened ceiling frame process.

[0021] The attached diagram is labeled as follows: 1. Fabric layer; 2. Surface fiberglass reinforced layer; 3. Foam layer; 4. Back fiberglass reinforced layer; 5. Notch; 6. Ceiling frame; 61. Fold-over section; 7. Filler strip. Detailed Implementation

[0022] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0023] See Figures 1-2 A roof sunroof edging structure for automobiles includes a roof frame 6 and a fabric layer 1 covering the front of the roof frame 6. A folded portion 61 is provided at the edge of the sunroof of the roof frame 6. The folded portion 61 folds towards the back of the roof frame 6 and is bonded to the roof frame 6 with hot melt adhesive. A notch 5 is provided on the back of the roof frame 6, located at the fold of the folded portion 61. The width of the folded portion 61 is 2 to 10 times the thickness of the roof frame 6. Preferably, in this embodiment, the width of the folded portion 61 is 3 times the thickness of the roof frame 6.

[0024] A filler strip 7 is provided at the notch 5. The filler strip 7 is a closed structure with its ends connected. The filler strip 7 is made of rubber or thermoplastic elastomer. In this embodiment, the filler strip 7 is natural rubber.

[0025] The canopy frame 6 includes a surface fiberglass reinforced layer 2, a foam layer 3, a back fiberglass reinforced layer 4, and a back nonwoven fabric arranged in sequence.

[0026] The notch 5 extends from the back of the ceiling frame 6 toward the interior of the ceiling frame 6, and penetrates at least the back fiberglass reinforcement layer 4 and the back nonwoven fabric, that is, it cuts off and removes a portion of the material of the back fiberglass reinforcement layer 4 and the back nonwoven fabric. In this embodiment, the depth of the notch 5 extends to the foam layer 3, that is, it removes a portion of the material of the foam layer 3. The width of the notch 5 is 0.5 to 2 times the thickness of the ceiling frame 6, and the depth of the notch 5 is 1 / 10 to 9 / 10 of the thickness of the ceiling frame 6.

[0027] The fabric layer 1 is disposed outside the surface fiberglass reinforcement layer 2.

[0028] The manufacturing process of the automotive sunroof edging structure of this utility model specifically includes the following steps: Step 1: Constructing the ceiling frame 6: Laying out the layers of materials, from top to bottom: fabric layer 1, surface fiberglass reinforcement layer 2, foam layer 3, back fiberglass reinforcement layer 4, back non-woven fabric (not shown in the figure), and molding. Step 2, Cutting: Cut the areas of the ceiling frame 6 and fabric layer 1 that need to be edged. The parts that do not need to be edged are cut directly to the desired position, while the parts that need to be edged are left with a folding allowance. In this embodiment, the area that needs to be edged is the skylight of the ceiling. The folding allowance is: the folding width of the folding part 61 reserved at the edge of the skylight of the ceiling frame 6 is 3 times the thickness of the ceiling frame 6. Step 3: Processing the notch 5: Cut the backing non-woven fabric, the backing fiberglass reinforcement layer 4, and part of the foam layer 3 along the fold line of the folded portion to form the notch 5. In this embodiment, the width of the notch 5 is 1 times the thickness of the ceiling frame 6, and the depth of the notch 5 extends to 1 / 2 the thickness of the foam layer 3 (see...). Figure 1 ); Step 4: Lay a filler strip 7 at the notch 5. The filler strip 7 is a closed structure with the ends connected. It is directly filled at the notch 5, that is, directly embedded in the notch 5. Step 5: Apply adhesive: Apply adhesive to the back of the folded part 61. In this embodiment, the adhesive used is PUR hot melt adhesive (purchased from Zhongke Litai). Step Six: Folding: Fold the fabric layer 1 from one side of the folded part 61 towards the back of the ceiling frame 6. Since the back of the ceiling frame 6 has a notch 5, the folding occurs at the notch 5. After folding, the folded part 61 is firmly bonded by the adhesive. The fabric layer 1 forms an edge binding structure at the fold. The filling strip 7 provides support for the fold of the ceiling frame 6 at the notch to ensure the strength of the fold and make the edge binding fuller (see...). Figure 2 ); In the existing edge-wrapping process, in step six above, since the back of the ceiling frame 6 lacks a notch 5, the folded portion of the ceiling frame 6 has no weakened area during the folding process, and the strength is basically uniform. Therefore, a template and a folding block are necessary to ensure that the folding action occurs at the edge of the template. With the structure of this invention, after the back of the ceiling frame 6 is cut to form the notch 5, the notch 5 becomes a weakened area in the strength of the ceiling frame 6. Therefore, in step six, this invention allows for easy folding, even by hand, without relying on equipment. Furthermore, the notch 5 of this invention is equipped with a filler strip 7 to ensure the strength of the folded area.

[0029] The new automotive sunroof edging structure not only improves the quality and stability of the edging but also reduces reliance on equipment during production, thereby increasing production efficiency. Furthermore, this edging structure makes the automotive sunroof more aesthetically pleasing while providing higher mechanical strength and durability, meeting the stringent quality and performance requirements of the automotive industry.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A roof sunroof edging structure for automobiles, characterized in that, Includes a ceiling frame (6) and a fabric layer (1) covering the front of the ceiling frame (6). The edge of the skylight of the ceiling frame (6) is provided with a folded part (61). The folded part (61) is folded to the back of the ceiling frame (6) and glued to the ceiling frame (6). The back of the ceiling frame (6) is provided with a notch (5). The notch (5) is located at the fold of the folded part (61).

2. The automotive roof sunroof edging structure according to claim 1, characterized in that, A filler strip (7) is provided at the notch (5).

3. The automotive roof sunroof edging structure according to claim 2, characterized in that, The filling strip (7) is a closed structure with the ends connected.

4. The automotive roof sunroof edging structure according to claim 1, characterized in that, The canopy frame (6) includes a surface fiberglass reinforced layer (2), a foam layer (3), a back fiberglass reinforced layer (4), and a back nonwoven fabric arranged in sequence.

5. The automotive roof sunroof edging structure according to claim 4, characterized in that, The notch (5) extends from the back of the ceiling frame (6) toward the interior of the ceiling frame (6) and penetrates at least the back fiberglass reinforcement layer (4) and the back nonwoven fabric.

6. The automotive roof sunroof edging structure according to claim 5, characterized in that, The depth of the notch (5) extends to the foam layer (3).

7. The automotive roof sunroof edging structure according to claim 6, characterized in that, The depth of the notch (5) is 1 / 10 to 9 / 10 of the thickness of the roof frame (6).

8. The automotive roof sunroof edging structure according to claim 3, characterized in that, The filler strip (7) is made of rubber or thermoplastic elastomer.

9. The automotive roof sunroof edging structure according to claim 1, characterized in that, The width of the folding part (61) is 2 to 10 times the thickness of the roof frame (6).

10. The automotive roof sunroof edging structure according to claim 9, characterized in that, The folding part (61) is bonded to the roof frame (6) by hot melt adhesive.

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