Instrument panel slush-molding and foaming sealing structure and foaming process

Abstract

An instrument panel slush-molding and foaming sealing structure and a foaming process. The instrument panel slush-molding and foaming sealing structure comprises an instrument panel body framework (1), a slush-molded skin (2), and a foam layer (3). Closed-mold foaming is performed in the foam region where the foam layer (3) is located and a foam material pouring port (13) is provided; a first soft sealing structure is provided at the front end region of the instrument panel body framework (1) and the slush-molded skin (2); and a first hard sealing structure is provided at the rear end region of the instrument panel body framework (1) and the slush-molded skin (2). The instrument panel slush-molding and foaming sealing structure uses a combination of soft sealing structures and hard sealing structures, which can effectively improve the molding quality of a product after slush-molding and foaming molding. In addition, a manufactured instrument panel foam member has a relatively large thickness and a soft and comfortable hand feeling, thereby improving the overall quality.

Description

A dashboard slush molding foam sealing structure and foaming process Technical Field

[0001] This invention relates to the field of automotive parts design and manufacturing, specifically to a dashboard slush molding foam sealing structure and a foaming process for applying the foam sealing structure to perform slush molding foaming. Background Technology

[0002] The passenger compartment of a car is the place where human-machine interaction between the car and its occupants is most frequent. Occupants can interact with interior parts in the passenger compartment through sight, hearing, touch, and smell. Taking touch as an example, when occupants touch interior parts, they can feel hardness and softness. It is precisely because of the surface material structure and surface treatment technology of interior parts that users have this intuitive feeling, and even affect their perception of the quality of the car. As a result, soft-touch dashboards are becoming increasingly popular among users.

[0003] Existing flexible dashboards generally include covered dashboards, molded dashboards, and slush-molded dashboards. However, most slush-molded dashboards in the current technology adopt the open mold casting process, which severely restricts the product shape and design freedom. Secondly, dashboards are mostly processed by stress, which is prone to cracking and resulting in poor overall continuity. Moreover, after foaming, quality problems such as wrinkles, voids, collapses, and glue leakage are prone to occur, resulting in a low product quality pass rate. At the same time, it is difficult to remove the surface process edge agent and skeleton process edge after foaming, resulting in high labor costs for enterprises.

[0004] Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention aims to provide a slush-molded foam sealing structure for instrument panels. The purpose of this invention is to cleverly combine a soft sealing structure with a hard sealing structure, which can effectively improve the molding quality of the product after slush-molded foam molding, thereby significantly improving the overall quality.

[0006] The technical solution adopted in this invention is as follows:

[0007] A dashboard slush molding foam sealing structure includes a dashboard body frame, a slush molding skin, and a foam layer. The foaming area where the foam layer is located is foamed using a closed mold and is equipped with a foaming material injection port. A first soft sealing structure is provided in the front end area of ​​the dashboard body frame and the slush molding skin, and a first hard sealing structure is provided in the rear end area of ​​the dashboard body frame and the slush molding skin.

[0008] This technical solution cleverly combines soft and hard sealing structures. During the foaming process, the hard sealing structure first completes the sealing, and when the foaming material is about to reach the soft sealing area, the soft sealing structure completes the sealing. The sealing performance is stable, which can effectively ensure the continuity of the overall foaming and avoid problems such as wrinkles, voids, collapses, and glue leakage. At the same time, this technical solution uses closed-mold foaming in the foaming area, which has greater freedom in appearance design compared to open-mold casting process. It can achieve multiple inverted molding, and the product has no stress processing process, which is not easy to crack and thus has no seams. The overall texture is uniform and beautiful. In contrast, negative mold foaming is more prone to damage.

[0009] As a preferred embodiment, the first soft sealing structure includes an inflatable hose, which is located at the front end of the instrument panel body frame and the slush-molded skin. When the foaming material is about to reach the soft sealing area, the inflatable hose inflates to complete the soft seal. Using an inflatable hose to achieve foam sealing can, on the one hand, remove air bubbles from the foaming area to prevent poor foaming at the soft-hard seal junction; on the other hand, it can achieve better inflatable sealing in localized areas by using the inflatable hose, thereby improving the molding quality of the product after slush-molded foaming. It has good practicality in the foaming process.

[0010] As a preferred embodiment, the first soft sealing structure further includes a pin assembly structure, which is disposed on the process edge of the front end area where the instrument panel body frame and the slush-molded skin are located. The design of the pin assembly structure can improve the installation stability of the instrument panel body frame after it is fastened, and at the same time help to improve the design accuracy of the air hose, so as to improve the sealing stability of the overall foaming process.

[0011] As a preferred embodiment, the pin assembly structure includes at least four pin structures, with a spacing L1 between two adjacent pin structures of 260-300mm, which helps improve the structural stability of the frame edge after the instrument panel body frame is fastened. As a further preferred embodiment, the front end of the pin structure is provided with a guide angle β, and the angle β is 15-20°, which facilitates the insertion of the instrument panel body frame into the foam mold.

[0012] As a preferred embodiment, a second soft-seal structure is provided at both ends of the instrument panel body frame and the slush-molded skin, and a third soft-seal structure is provided at the rear end of the instrument panel body frame and the slush-molded skin. Preferably, both the second and third soft-seal structures include the inflation hose and the pin, and a gradient transition structure is provided at the inflation joint between the instrument panel body frame and the slush-molded skin. The gradient transition structure can effectively prevent poor foaming at the soft and hard seal joint, such as wrinkles, voids, collapses, and glue leakage.

[0013] As a preferred embodiment, the length L2 of the gradient transition structure along the gradient region of the foam layer is ≥20mm; as a further preferred embodiment, the angle Ψ of the gradient transition structure is approximately 15°, and the gradient R angle r2 is approximately R30mm, which is beneficial to improve the sealing performance at the soft and hard sealing joint, thereby improving the foaming quality of the product in this area.

[0014] As a preferred embodiment, the first hard seal structure includes a hard seal rib with a trapezoidal cross-section disposed on the instrument panel body frame. The thickness of the hard seal rib near the top of the slush-molded surface is less than the thickness of its root portion mounted on the instrument panel body frame. The thickness of the root portion of the hard seal rib is determined according to the mold angle. As a further preferred embodiment, a second hard seal structure is disposed in the A-pillar area on both sides of the instrument panel body frame and the slush-molded surface. The second hard seal structure is preferably the same as the first hard seal structure. At the same time, the gradient transition area between the hard seal structure and the soft seal structure preferably adopts the above-mentioned gradient transition structure to ensure a better sealing effect in this area.

[0015] On the other hand, the present invention also provides a foaming process that utilizes the above-mentioned dashboard slush molding foam sealing structure for slush molding foaming, the foaming process comprising the following steps:

[0016] The instrument panel body frame is formed by injection molding, the slush molding skin is formed by slush molding mold, and the foam layer is formed by foaming mold. During the foaming process, the hard sealing structure first completes the sealing, and when the foam material is about to reach the soft sealing area, the soft sealing structure completes the sealing.

[0017] As a preferred option, after foaming, the instrument panel body frame and the edge of the slush-molded skin are removed by milling.

[0018] Instrument panels made using this technology with slush molding foaming process have a thicker foam thickness, typically 4-10mm, resulting in a soft and comfortable feel. After foaming, the surface edges are removed by hand tearing, and the frame edges are removed by milling. This highly automated process significantly reduces labor costs.

[0019] The beneficial effects of this invention are as follows:

[0020] 1. The slush molding foam instrument panel of this invention adopts closed-mold foaming. During the foaming process, the hard sealing structure first completes the sealing. When the foaming material is about to reach the soft sealing area, the soft sealing structure completes the sealing. This can effectively ensure the continuity of the overall foaming and avoid problems such as wrinkles, voids, collapses, and glue leakage, thereby improving the molding quality of the product after slush molding foaming and significantly improving the overall quality.

[0021] 2. The first soft sealing structure of this invention uses an inflatable hose to achieve foam sealing, and combines it with a pin to ensure the installation stability of the instrument panel body frame after fastening, so as to effectively guarantee the design accuracy of the inflatable hose. The design of the inflatable hose can, on the one hand, extract air bubbles in the foaming area to prevent poor foaming at the soft and hard seal joint; on the other hand, it can use the inflatable hose to achieve better inflatable sealing in local positions, improving the molding quality of the product after slush molding and foaming. This soft sealing structure design is ingenious and reasonable.

[0022] 3. The first hard sealing structure of the present invention uses a hard sealing rib with a trapezoidal cross section for sealing. The structure design is simple but ingenious and reasonable, and the processing procedures are simplified. In addition, the transition area between the hard sealing structure and the soft sealing structure preferably uses a transition structure for sealing, which can effectively ensure a good sealing effect in this area, is not easy to produce seams, and the overall texture is uniform and beautiful.

[0023] 4. This invention enables localized slush molding and foaming of the main body frame, significantly improving the overall continuous aesthetics. In addition to the first soft sealing structure and the first hard sealing structure, it also includes a second soft sealing structure, a third soft sealing structure, and a second hard sealing structure. Furthermore, a gradient transition structure is provided at the air inlet joint between the instrument panel main body frame and the slush molding surface. The gradient transition structure effectively prevents technical problems such as poor foaming at the soft and hard sealing joint, resulting in a soft slush molding texture and further enhancing the overall quality.

[0024] 5. The instrument panel foam parts made using the slush molding foam sealing structure of this invention are relatively thick, generally 4-10mm, so they have a soft and comfortable feel. After foaming and molding, the surface process edges are removed by hand tearing and the skeleton process edges are removed by milling. The degree of automation is high, which can greatly reduce labor costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 shows a schematic diagram of the instrument panel slush foam sealing structure in an embodiment of the present invention;

[0027] Figure 2 shows a schematic diagram of the instrument panel body skeleton in an embodiment of the present invention;

[0028] Figure 3 shows a schematic diagram of the slush-molded skin in an embodiment of the present invention;

[0029] Figure 4 shows a cross-sectional view of AA in Figure 1 of the embodiment of the present invention;

[0030] Figure 5A shows a schematic diagram of the pin structure in an embodiment of the present invention;

[0031] Figure 5B shows a schematic diagram of the installation of the pin structure in an embodiment of the present invention;

[0032] Figure 6 shows a schematic diagram of the first hard seal structure in an embodiment of the present invention;

[0033] Figure 7 shows a schematic diagram of the gradient surface transition structure in an embodiment of the present invention;

[0034] Figure 8 shows a schematic diagram of the foaming material pouring port in an embodiment of the present invention.

[0035] In the diagram: 1-Dashboard body frame; 2-Slush-molded skin; 3-Foaming layer; 4-Inflatable hose; 5-Foaming mold cavity; 6-Foaming mold core; 7-Pin structure; 8-Frame process edge; 9-Hard sealing rib; 10-Gradual surface transition structure; 11-A-pillar area; 12-Skin A-side; 13-Foaming material pouring port. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Example 1

[0039] Please refer to Figures 1 to 4. This embodiment provides a dashboard slush molding foam sealing structure, which is applied between the foaming mold core 6 and the foaming mold cavity 5 of the slush molding foam dashboard mold to ensure the sealing performance and overall continuity of the dashboard slush molding foaming process. The foam sealing structure includes a dashboard body skeleton 1, a slush molding skin 2 and a foam layer 3. The foaming area where the foam layer 3 is located adopts closed-mold foaming and is equipped with a foaming material pouring port, which means that it can use a closed-mold pouring self-sealing form to seal the material.

[0040] Crucially, in this embodiment, a first soft-seal structure is provided in the front end region of the instrument panel body frame 1 and the slush-molded skin 2. This front end region is the same as the front end region typically referred to in molded instrument panels, specifically, the a-b-c region in Figure 1 of this embodiment uses a soft seal. Specifically, the first soft-seal structure provided in this embodiment includes an inflation hose 4, which is located in the front end region of the instrument panel body frame 1 and the slush-molded skin 2. When the foaming material is about to reach the soft-seal region, the inflation hose 4 inflates to complete the soft seal. Preferably, in this embodiment, the first soft-seal structure also includes a pin assembly structure, which is located in the instrument panel body frame. 1. On the front-end area where the slush-molded skin 2 is located, on the skeleton process edge 8; the design of the pin assembly structure can make the installation stability of the instrument panel body skeleton 1 better after it is fastened, and at the same time, it is conducive to improving the design accuracy of the air hose 4, so as to improve the sealing stability of the overall foaming process; combined with the design of the pin assembly structure, the air hose 4 provided in this embodiment is used to achieve foaming sealing. On the one hand, it can extract the air bubbles in the foaming area to prevent poor foaming at the soft and hard sealing joint; on the other hand, it can use the air hose 4 to achieve better air sealing in local positions, improve the molding quality of the product after slush-molded foaming, and has good practicality in the foaming process.

[0041] This embodiment optimizes the structural design of the pin assembly. As shown in Figures 5A and 5B, at least four pin structures 7 are provided on the skeleton process edge 8 in the a-b-c region of Figure 1. Taking four pin structures 7 as an example, the thickness t1 of each pin structure 7 is approximately 3.0 mm, and the width a of each pin structure 7 is approximately 45 mm. After the pin structure 7 is inserted into the instrument panel body skeleton 1, its height h1 outside the skeleton process edge 8 is 40-50 mm. To improve the structural stability of the skeleton process edge 8 after the instrument panel body skeleton 1 is fastened, the distance L1 between two adjacent pin structures 7 is maintained at 260-300 mm in this embodiment. At the same time, to facilitate the installation of the instrument panel body skeleton 1 into the foaming mold, this embodiment provides a guide angle β at the front end of the pin structure 7, and the angle β is 15-20°. This structural design is ingenious and reasonable.

[0042] In this embodiment, a first hard sealing structure is provided in the rear end region of the instrument panel body frame 1 and the slush-molded skin 2. The rear end region referred to here is the same as the rear end region usually referred to in the molded instrument panel, that is, the e-f, g-h-j, k-m region in Figure 1 of this embodiment. Specifically, please refer to Figure 6. The first hard sealing structure includes a hard sealing rib 9 with a trapezoidal cross section disposed on the instrument panel body frame 1. The thickness of the hard sealing rib 9 near the top of the slush-molded skin 2 is less than the thickness of its root part installed on the instrument panel body frame 1. The thickness of the root part of the hard sealing rib 9 is determined according to the mold angle.

[0043] To prevent the front end of the instrument panel body frame 1 from deforming during injection molding or foaming, a flange H can be added to the instrument panel body frame 1, with a flange height of approximately 5mm. Combined with the design of the slush-molded skin 2 in Figure 5, the distance L1 between the slush-molded skin A surface 12 at the soft sealing position and the instrument panel body frame 1 is approximately 2.7mm, and the diameter d1 of the air inflatable hose 4 is approximately 10mm. During the foaming process, the hard sealing position is sealed first, and when the foaming material is about to reach the soft sealing area, the air inflatable hose 4 is used to inflate and complete the soft sealing.

[0044] On the other hand, this embodiment also provides a foaming process for slush molding using the above-mentioned instrument panel slush molding foam sealing structure, including the following process steps:

[0045] The instrument panel body frame 1 is formed by injection molding, and the thickness of the instrument panel body frame 1 is 3.5mm; the slush plastic skin 2 is formed by slush plastic mold, and the thickness of the slush plastic skin 2 is 1.2mm, and the radius of curvature of the slush plastic skin 2 is approximately 1.5mm; the foam layer 3 is formed by foaming mold, and the thickness of the foam layer 3 is 10mm. During the foaming process, the first hard sealing structure first completes the sealing, and when the foam material is about to reach the soft sealing area, the first soft sealing structure completes the sealing; in order to ensure the precise snap-fit ​​position of the left and right side grilles, the snap-fit ​​surface of the grilles is specially made by injection molding. Therefore, during foaming, masking tape needs to be pasted on the grille for sealing, and after the foaming is completed, it is removed by milling.

[0046] Furthermore, the entire foaming area employs closed-mold foaming, as shown in Figure 8. The size d2 of the foam material gate 13 is approximately φ20mm. As a preferred embodiment, a cross-shaped rib with a thickness of approximately 2.0mm is made in the middle of the foam material gate to divide the gate, avoiding excessive impact force and material from the gate, which could cause impact marks on the A-side 12 of the slush-molded skin. To prevent leakage of material between the mold gating head and the foam material gate, sealing foam is added at the gate location. After foaming, the instrument panel body frame 1 and the process edges of the slush-molded skin 2 are removed by milling.

[0047] As described above, this embodiment cleverly combines soft and hard sealing structures in the slush molding foaming process. The dashboard made using this slush molding foaming process has a thicker foam thickness, resulting in a soft and comfortable feel. Simultaneously, the sealing structure effectively ensures the continuity of the overall foaming process, avoiding problems such as wrinkles, voids, collapses, and glue leakage. Closed-mold foaming is used in the foaming area, offering greater freedom in appearance design compared to open-mold casting processes. Multiple inverted moldings can be achieved, and the product undergoes stress-free processing, reducing the likelihood of cracking and creating seamless seams. The overall texture is uniform and aesthetically pleasing, effectively improving the molding quality of the product after slush molding foaming, thus significantly enhancing the overall quality.

[0048] Example 2

[0049] Example 2 is basically the same as Example 1, except that, as shown in Figures 1 to 4, this example provides a dashboard slush-molded foam sealing structure. Based on Example 1, this example also includes a second soft sealing structure, a third soft sealing structure, and a second hard sealing structure. Specifically, the second hard sealing structure is provided in the A-pillar areas 11 on both sides of the dashboard body frame 1 and the slush-molded skin 2. That is, the a-n and c-d areas in Figure 1 of this example use hard sealing. The second hard sealing structure is preferably the same as the first hard sealing structure, both of which use hard sealing ribs 9 on the dashboard body frame 1 for hard sealing. In this example, the thickness t2 of the hard sealing rib 9 near the top of the slush-molded skin 2 is 1.0-2.0 mm, and the thickness t3 of the root of the hard sealing rib 9 installed on the dashboard body frame 1 is determined according to the mold angle. The distance h2 between the slush-molded skin A-side 12 and the sealing rib is about 0.3 mm.

[0050] In this embodiment, a second soft sealing structure is provided at both ends of the instrument panel body frame 1 and the slush-molded skin 2. That is to say, the d-e and m-n areas in Figure 1 of this embodiment are soft sealed. The second soft sealing structure here includes the air hose 4 and the pin structure in Embodiment 1. Furthermore, in order to prevent poor foaming at the soft and hard seal joint, a gradient surface transition structure 10 is provided at the air joint position of the instrument panel body frame 1 and the slush-molded skin 2. Referring to Figure 7, the gradient surface transition structure 10 provided in this embodiment has a length L2 ≥ 20 mm along the gradient area of ​​the foam layer 3. As a preferred option for the gradient surface transition structure 10, the angle Ψ of the gradient surface transition structure 10 is about 15° and the gradient R angle r2 is about R30 mm. In combination with the design of the pin structure and the gradient surface transition structure 10, a sponge strip can also be used for sealing to ensure that there is no local leakage of glue during foaming.

[0051] The third soft sealing structure provided in this embodiment is set at the rear end of the instrument panel body frame 1 and the slush-molded skin 2. That is to say, the f-g and j-k areas in Figure 1 of this embodiment adopt soft sealing. The third soft sealing structure in this embodiment is the same as the second soft sealing structure, both of which include the air hose 4 and the pin structure in Embodiment 1, and the gradient surface transition structure 10 shown in Figure 7 is set in the gradient transition area between the hard sealing structure and the soft sealing structure, so it will not be described in detail.

[0052] On the other hand, this embodiment also provides a foaming process, which utilizes the above-mentioned instrument panel slush molding foam sealing structure for slush molding foaming. This foaming process includes the following steps:

[0053] The instrument panel body frame 1 is formed by injection molding, and the thickness of the instrument panel body frame 1 is 2.5mm; the slush-molded skin 2 is formed by slush molding, and the thickness of the slush-molded skin 2 is 0.8mm, and the radius of curvature (R) of the slush-molded skin 2 is approximately 1.5mm; the foam layer 3 is formed by foam molding, and the thickness of the foam layer 3 is 4mm. During the foaming process, the first and second hard sealing structures first complete the sealing. When the foam material is about to reach the soft sealing area, the first, second, and third soft sealing structures then complete the sealing. In order to ensure the precise snap-fit ​​position of the left and right side grilles, the grille snap-fit ​​surface is specially made by injection molding. Therefore, during foaming, masking tape needs to be applied to the grille for sealing. After foaming is completed, it is removed by milling. Finally, after foaming, the skin process edge is removed by hand tearing, and the frame process edge 8 is removed by milling. The degree of automation is high, which can greatly reduce labor costs.

[0054] In summary, the slush molding foam instrument panel of this invention adopts closed-mold foaming and cleverly combines soft and hard sealing structures. During the foaming process, the hard sealing structure first completes the sealing, and when the foam material is about to reach the soft sealing area, the soft sealing structure completes the sealing. This effectively ensures the continuity of the overall foaming and avoids problems such as wrinkles, voids, collapses, and glue leakage, thus improving the molding quality of the slush molding foamed product and significantly enhancing the overall quality. At the same time, different sealing structures and hard sealing structures are provided for different foaming areas, and a gradient transition structure 10 is provided in the transition area between the hard and soft sealing structures. This effectively prevents technical problems such as poor foaming at the junction of the soft and hard sealing structures, ensuring that the overall texture of the product is uniform and aesthetically pleasing.

[0055] The instrument panel foam parts made using the slush molding foam sealing structure of this invention are relatively thick, generally 4-10mm, thus having a soft and comfortable feel. After foaming and molding, the surface process edges are removed by hand tearing, and the skeleton process edges are removed by milling. The degree of automation is high, which can greatly reduce labor costs. It has good application prospects and promotion value in the field of instrument panel slush molding design and manufacturing technology, and is suitable for widespread application.

[0056] The specification and drawings of this invention are intended to be illustrative rather than restrictive. Based on this invention, those skilled in the art can make substitutions and modifications to some of the technical features without creative effort, and all such modifications are within the scope of protection of this invention.

Claims

1. A dashboard slush-molded foam sealing structure, comprising a dashboard body skeleton, a slush-molded skin, and a foam layer, characterized in that: The foaming area where the foam layer is located adopts closed-mold foaming and is equipped with a foaming material pouring port. A first soft sealing structure is provided in the front end area of ​​the instrument panel body frame and the slush plastic skin; a first hard sealing structure is provided in the rear end area of ​​the instrument panel body frame and the slush plastic skin.

2. The instrument panel slush-molded foam sealing structure according to claim 1, characterized in that: The first soft sealing structure includes an inflatable hose, which is located at the front end of the instrument panel body frame and the slush plastic skin. When the foam material is about to reach the soft sealing area, the inflatable hose is inflated to complete the soft sealing.

3. The instrument panel slush-molded foam sealing structure according to claim 2, characterized in that: The first soft sealing structure also includes a pin assembly structure, which is disposed on the skeleton process edge of the front end area where the instrument panel body skeleton and the slush-molded skin are located.

4. The instrument panel slush-molded foam sealing structure according to claim 3, characterized in that: The pin assembly structure includes at least four pin structures, and the distance L1 between two adjacent pin structures is 260-300mm; preferably, the front end of the pin structure is provided with a guide angle β, and the angle β is 15-20°.

5. The instrument panel slush-molded foam sealing structure according to claim 3, characterized in that: A second soft-seal structure is provided at both ends of the instrument panel body frame and the slush-molded skin, and a third soft-seal structure is provided at the rear end of the instrument panel body frame and the slush-molded skin; preferably, both the second soft-seal structure and the third soft-seal structure include the inflation hose and the pin, and a gradient surface transition structure is provided at the inflation joint position between the instrument panel body frame and the slush-molded skin.

6. The instrument panel slush-molded foam sealing structure according to claim 5, characterized in that: The length L2 of the gradient transition structure along the gradient region of the foam layer is ≥20mm.

7. The instrument panel slush-molded foam sealing structure according to claim 1, characterized in that: The first hard seal structure includes a hard seal rib disposed on the instrument panel body frame and having a trapezoidal cross-section. The thickness of the hard seal rib near the top of the slush-molded skin is less than the thickness of its root portion mounted on the instrument panel body frame.

8. The instrument panel slush-molded foam sealing structure according to claim 7, characterized in that: A second hard seal structure is also provided in the A-pillar area on both sides of the instrument panel body frame and the slush-molded surface. The second hard seal structure is the same as the first hard seal structure.

9. A foaming process, characterized in that: The instrument panel slush molding foam sealing structure as described in any one of claims 1-8 is used for slush molding foaming, and the foaming process includes the following steps: The instrument panel body frame is formed by injection molding, the slush molding skin is formed by slush molding mold, and the foam layer is formed by foaming mold. During the foaming process, the hard sealing structure first completes the sealing, and when the foam material is about to reach the soft sealing area, the soft sealing structure completes the sealing.

10. The foaming process according to claim 9, characterized in that: After foaming, the instrument panel body frame and the edge of the slush-molded skin are removed by milling.

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