High-curvature sheet metal sealing plate and soft and hard material distribution optimization method

Abstract

The invention relates to the technical field of sheet metal sealing, in particular to a high-curvature sheet metal sealing plate and a soft and hard material distribution optimization method. The high-curvature metal plate sealing plate comprises a sealing plate body. The sealing plate body comprises a low-curvature matching area, a high-curvature matching area and a transition area. The low-curvature matching area is formed by injection molding of a hard material and is clamped with the low-curvature area of the metal plate; the high-curvature matching area is formed by injection molding of a soft material and is clamped with the high-curvature area of the metal plate; a hard material and a soft material are continuously distributed in the transition area according to a curvature change gradient; a sealing strip is arranged on the circumferential edge of the sealing plate body. The sealing plate is suitable for high-curvature and complex-profile metal plates, sealing reliability is improved, assembling operation is simplified, and working hours are reduced.

Description

Technical Field

[0001] This invention relates to the field of sheet metal sealing technology, and in particular to a high-curvature sheet metal sealing plate and a method for optimizing the distribution of soft and hard materials. Background Technology

[0002] In automotive door manufacturing, the inner sheet metal has a hollow area due to the installation of the window regulator mechanism. This hollow area needs to be filled with a sealing plate to ensure the overall vehicle's sealing, sound insulation, and dust and water resistance. Traditional sealing plates are made by deforming the material to fit the sheet metal surface. Their structural design directly affects their adaptability to the sheet metal curvature, assembly efficiency, and long-term sealing reliability.

[0003] Existing technology uses a single-color injection-molded sealing plate. The plastic sheet is integrally injection-molded from a single rigid material and is fixed to the sheet metal by snap-fitting. The gaps are filled by compression of sealing sponge strips. During assembly, an impact force (Y-axis impact) needs to be applied along the positive contour of the sheet metal to force the rigid plate to deform and match the sheet metal profile.

[0004] The existing technology has the following problems:

[0005] First, it has poor adaptability to sheet metal surfaces. Rigid plastic sheets have limited deformation capacity, making it difficult to fit sheet metal with large curvature or complex shapes, resulting in poor sealing in high curvature areas.

[0006] Secondly, the assembly process is cumbersome. Due to the high rigidity of the material, it requires strong impact to get it in place, which increases labor time and can easily damage the parts. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a high curvature sheet metal sealing plate that can adapt to high curvature and complex surface sheet metal, improve sealing reliability, simplify assembly operations, and reduce working time.

[0008] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0009] A high-curvature sheet metal sealing plate includes a sealing plate body, which comprises a low-curvature matching area, a high-curvature matching area, and a transition area. The low-curvature matching area is injection molded from a rigid material and engages with a low-curvature area of ​​the sheet metal. The high-curvature matching area is injection molded from a flexible material and engages with a high-curvature area of ​​the sheet metal. The transition area continuously distributes rigid and flexible materials according to a curvature gradient. A sealing strip is provided on the circumferential edge of the sealing plate body.

[0010] Optionally, the mating surfaces of the rigid material region and the soft material region are provided with an interlocking interface structure, the interface structure including a protrusion on the rigid material side and a corresponding groove on the soft material side.

[0011] Optionally, the rigid material is a glass fiber reinforced polyolefin material.

[0012] Optionally, the glass fiber in the glass fiber reinforced polyolefin material is 5%-10% by mass.

[0013] Optionally, the soft material is a weather-resistant thermoplastic elastomer.

[0014] This invention also provides a method for optimizing the distribution of soft and hard materials in a high-curvature sheet metal sealing plate as described above, comprising:

[0015] Surface geometric data of the sheet metal inside the door are obtained through 3D scanning;

[0016] Calculate the local curvature values ​​at various locations on the sheet metal surface based on geometric data;

[0017] The surface is divided into the following categories based on preset low curvature thresholds and high curvature thresholds:

[0018] The low-curvature injection molding area is entirely made of rigid materials through injection molding;

[0019] The high-curvature injection molding area is entirely made of soft material through injection molding;

[0020] In the transition injection zone, the volume ratio of soft and hard materials is continuously adjusted according to the change in curvature value.

[0021] Optionally, the volume ratio of the soft material in the transition injection molding zone is set to increase monotonically with the increase of the local curvature value.

[0022] Optional, also includes:

[0023] Obtain the target operating temperature parameters;

[0024] Based on the temperature function of the elastic modulus of rigid materials and the temperature function of the creep strain of soft materials, the dynamic boundary curvature after temperature compensation is calculated.

[0025] The boundary between the high-curvature injection molding zone and the low-curvature injection molding zone is corrected based on the dynamic boundary curvature.

[0026] Optionally, the amount of glass fiber added to the rigid material region is set to increase in a gradient as the absolute difference between the current curvature and the dynamic boundary curvature increases.

[0027] Optionally, the rigid material is made of glass fiber reinforced polypropylene or polyethylene, and the flexible material is made of hydrogenated styrene-based thermoplastic elastomer.

[0028] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0029] This invention's high-curvature sheet metal sealing plate achieves precise adaptation to sheet metal surfaces with different curvatures by dividing it into a low-curvature matching zone, a high-curvature matching zone, and a transition zone. The low-curvature matching zone is injection-molded with a rigid material, enabling stable engagement with the low-curvature areas of the sheet metal. The rigidity of the rigid material ensures structural stability in the low-curvature areas. The high-curvature matching zone is injection-molded with a soft material, leveraging its deformability to tightly engage with the high-curvature areas of the sheet metal, solving the problem of traditional rigid materials being unable to adapt to high-curvature surfaces. The transition zone continuously distributes rigid and soft materials according to the curvature gradient, allowing for a smooth transition from rigid to soft materials, avoiding stress concentration caused by abrupt material changes, and improving the overall fit between the sealing plate and complex sheet metal surfaces. The sealing strip along the circumferential edge of the sealing plate fills the tiny gaps between the sealing plate and the sheet metal, further enhancing sealing performance. This, combined with the materials in each matching zone, creates a synergistic sealing effect, ensuring the overall sealing performance of the vehicle while simplifying the assembly process, achieving effective engagement without requiring significant external force.

[0030] Advantages of additional aspects of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In addition, the dimensions or spacing between the components are exaggerated to show the position of each component, and the schematic diagrams are for illustrative purposes only.

[0032] Figure 1 This is a side view of the curvature of the high-curvature sealing plate provided in an embodiment of the present invention;

[0033] Figure 2 This is an isometric side view of the high curvature sealing plate installed inside the door sheet metal according to an embodiment of the present invention;

[0034] Figure 3 This is an exploded view of the high curvature sealing plate provided in an embodiment of the present invention;

[0035] Figure 4 This is the matching cross section between the high curvature sealing plate and the inner sheet metal of the door provided in the embodiments of the present invention;

[0036] Figure 5 This is the mating cross section of the joint area of ​​the two injection molding materials of the high curvature sealing plate provided in the embodiments of the present invention;

[0037] In the diagram: 1. Sealing plate body; 2. Inner door sheet metal; 3. Sealing sponge strip; 4. Soft rubber; Detailed Implementation

[0038] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] Example 1

[0040] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, this embodiment proposes a high-curvature sheet metal sealing plate, including a sealing plate body 1. The sealing plate body 1 includes a low-curvature matching area, a high-curvature matching area, and a transition area. The low-curvature matching area is injection molded from a rigid material and snaps into the low-curvature area of ​​the sheet metal. The high-curvature matching area is injection molded from a soft material (soft rubber 4) and snaps into the high-curvature area of ​​the sheet metal. The transition area continuously distributes rigid and soft materials according to the curvature gradient. A sealing sponge strip 3 is pasted on the entire flange area where the sealing plate body 1 matches the inner sheet metal 2 of the door to increase the sealing performance.

[0041] The low-curvature matching zone is injection molded with a rigid material to ensure a stable and rigid connection with the flat sheet metal area. The high-curvature matching zone is injection molded with a soft material, which tightly fits the complex curved sheet metal surface through the material's deformation capability. The gradient material distribution in the transition zone eliminates abrupt changes in the hard / soft material interface, reducing the risk of stress concentration. The circumferential sealing sponge strip 3 compensates for assembly tolerances and forms a secondary sealing barrier. The rigid zone provides structural support, the soft zone achieves deformation sealing, and the transition zone smoothly transmits mechanical forces. The combination of these three elements enhances the overall sealing reliability.

[0042] The interface between the rigid material area and the soft material area is provided with an interlocking interface structure, which includes a protrusion on the rigid material side and a corresponding groove on the soft material side.

[0043] The interlocking of the protrusions on the rigid material side and the corresponding grooves on the flexible material side increases the contact area between the two materials, resulting in a tighter bond between them. This effectively disperses stress at the joint, preventing cracking due to material properties differences or external forces, and improving the structural integrity and service life of the sealing plate body 1. Simultaneously, the interlocking structure restricts the relative displacement of the two materials during assembly and use, ensuring the stability of the overall shape of the sealing plate and guaranteeing that the engagement with the sheet metal is unaffected by the material bonding state.

[0044] In addition, the thickness of the joint between the rigid and flexible materials in the two-color injection molding of the sealing plate is increased to increase the contact area between the two materials and prevent cracking at the joint.

[0045] In this embodiment, the rigid material can be glass fiber reinforced polyolefin. Compared to the ordinary rigid materials used in traditional monochrome injection-molded sealing plates, the addition of glass fiber can improve the material's rigidity and impact resistance. In the application scenario of the inner sheet metal 2 of an automotive door, the sealing plate needs to withstand certain assembly forces and vibrations during use. Glass fiber reinforced polyolefin can better resist these external forces, reduce deformation, and ensure stable engagement with the low-curvature area of ​​the sheet metal. In addition, the heat resistance of this material is better than that of ordinary rigid materials. It can still maintain good mechanical properties in high-temperature environments, adapt to temperature changes that may occur during automotive use, and avoid the sealing effect being affected by the degradation of material performance due to high temperatures.

[0046] The glass fiber reinforced polyolefin material contains 5%-10% glass fiber by mass. When the glass fiber mass percentage is below 5%, the reinforcing effect on the material is limited, making it difficult to significantly improve rigidity and impact resistance. When it is above 10%, it affects the injection molding flowability of the material, leading to molding difficulties, and may also increase the brittleness of the material, which is detrimental to the processing and use of the sealing plate. A proportion of 5%-10% can ensure that the material has sufficient rigidity, impact resistance, and heat resistance while ensuring good injection molding performance, meeting the needs of mass production of sealing plates.

[0047] The soft material is a weather-resistant thermoplastic elastomer, which offers superior weather resistance compared to ordinary soft materials used in traditional monochrome injection-molded sealing plates. During automotive use, sealing plates are exposed to various climatic conditions, such as high temperature, high humidity, and ultraviolet radiation. Weather-resistant thermoplastic elastomers can resist the effects of these environmental factors, reducing aging, hardening, or creep. In the engagement between high-curvature matching areas and high-curvature areas of the sheet metal, this material maintains good elasticity and deformability over a long period, ensuring a tight fit with the sheet metal, preventing a decline in sealing performance due to material aging, and extending the service life of the sealing plate. It is particularly suitable for automotive applications in high-temperature and high-humidity regions such as Southeast Asia and the Middle East.

[0048] In summary, the sheet metal sealing plate of this embodiment can achieve sealing of sheet metal with high curvature and complex surface, and also makes the assembly method simpler. It breaks the limitation of traditional sheet metal sealing plates on sheet metal with small curvature, can adapt to more diverse sheet metal surfaces, and saves assembly time.

[0049] During assembly, align the sealing plate with the outline of the inner sheet metal 2 of the door, prioritize engaging the rigid material part with the inner sheet metal 2 of the door, and then gently tap the soft material part to make the sealing plate and the inner sheet metal 2 of the door firmly engaged. The assembly is considered successful when the sealing plate and the inner sheet metal 2 of the door are tightly attached after assembly.

[0050] Example 2

[0051] In automotive applications with high temperature and humidity (such as Southeast Asia and the Middle East), the surface temperature of car door sheet metal can reach over 70°C. Under these conditions, conventional sealing plates exhibit the following problems: rigid materials (ordinary PP / PE) experience reduced impact resistance at high temperatures, while soft materials (ordinary TPS) exhibit increased creep rates, leading to stress concentration at the joint interface. Furthermore, the manually defined boundaries between rigid and soft materials do not account for the dynamic deformation differences caused by temperature variations. At high temperatures, excessive creep in high-curvature areas can cause the sealing plate to detach from the sheet metal in certain areas.

[0052] Based on this, the rigid material is glass fiber reinforced PP / PE (with 5%-10% short glass fiber added), and the flexible material is hydrogenated TPS. Glass fiber reinforced polypropylene or polyethylene has good rigidity, impact resistance, and heat resistance, which can meet the stable snap-fit ​​requirements between the low curvature matching area of ​​the sealing plate and the sheet metal, and adapt to the mechanical and environmental requirements during automotive use. Hydrogenated styrene-based thermoplastic elastomers, as weather-resistant thermoplastic elastomers, have excellent weather resistance and creep resistance. They can maintain good deformability and sealing performance in the high curvature matching area, and can reduce creep even in high temperature and high humidity environments, ensuring a tight fit with the high curvature area of ​​the sheet metal. The combined use of the two materials fully leverages their respective performance advantages, synergistically achieving the adaptation of the sealing plate to high curvature and complex-shaped sheet metal, while improving the overall service life and reliability of the sealing plate.

[0053] Based on the above materials, the distribution of hard and soft materials is optimized using 3D scanning, including: obtaining the surface geometric data of the sheet metal inside the door through 3D scanning; calculating the local curvature value of each position on the sheet metal surface based on the geometric data; and dividing the surface into: a low curvature injection molding area, which is entirely injection molded with hard materials; a high curvature injection molding area, which is entirely injection molded with soft materials; and a transition injection molding area, where the volume ratio of hard and soft materials is continuously adjusted according to the change in curvature value.

[0054] By acquiring the surface geometry data of the sheet metal inside the door through 3D scanning, the curvature changes and surface features of the sheet metal surface can be accurately captured, providing accurate basic data for subsequent curvature calculation and area division. Local curvature values ​​calculated based on geometric data can quantify the curvature magnitude at various locations on the sheet metal, making the division of low-curvature injection molding areas, high-curvature injection molding areas, and transition injection molding areas more targeted. The low-curvature injection molding area uses rigid materials to meet the stability requirements of low-curvature parts of the sheet metal; the high-curvature injection molding area uses soft materials to meet the deformation adaptation requirements of high-curvature parts; the transition injection molding area continuously adjusts the volume ratio of soft and hard materials according to the curvature value changes, achieving a smooth transition between material distribution and the sheet metal surface. This method allows the material distribution of the sealing plate to accurately match the curvature characteristics of the sheet metal, solving the problem that traditional single-color injection molded sealing plates cannot adapt to complex surfaces due to the single material, improving the overall fit between the sealing plate and the sheet metal, ensuring sealing performance while improving assembly convenience.

[0055] Furthermore, the volume ratio of soft material in the transition injection molding zone is set to increase monotonically with the increase of local curvature value, so that the material properties of the transition zone can change synchronously with the change of sheet metal curvature. When the local curvature is small, the proportion of hard material in the transition zone is higher, maintaining better rigidity and connecting with the performance of the low curvature matching zone; when the local curvature increases, the proportion of soft material gradually increases, and the deformability of the material is improved accordingly, connecting with the performance of the high curvature matching zone. Through the continuously increasing proportion change, abrupt changes in the material properties of the transition zone are avoided, stress concentration caused by differences in material properties is reduced, and the sealing plate can more evenly bear the assembly force and external forces during use in the transition zone, further improving the fitting accuracy between the sealing plate and the sheet metal surface and ensuring the consistency of the seal.

[0056] Furthermore, the method for optimizing the distribution of hard and soft materials also includes: obtaining the target working temperature parameters; calculating the dynamic boundary curvature after temperature compensation based on the temperature function of the elastic modulus of the hard material and the temperature function of the creep strain of the soft material; and correcting the boundary between the high curvature injection molding area and the low curvature injection molding area according to the dynamic boundary curvature.

[0057] By obtaining the target operating temperature parameters and combining the temperature function of the elastic modulus of rigid materials and the temperature function of the creep strain of soft materials, the dynamic boundary curvature after temperature compensation can be calculated, thus taking into account the influence of temperature on material properties. In high-temperature environments, the elastic modulus of rigid materials decreases, while the creep rate of soft materials increases. If a fixed material distribution boundary is still used, excessive creep of the soft material in high-curvature areas may occur, causing the sealing plate to detach from the sheet metal in some areas. By using dynamic boundary curvature correction to define the boundary, the material distribution can adapt to the changes in material properties caused by temperature variations. This ensures that the division between the rigid and soft material areas remains reasonable under different temperature conditions, guaranteeing the stability of the connection and sealing performance between the sealing plate and the sheet metal, and extending the service life of the sealing plate in extreme temperature environments.

[0058] The amount of glass fiber added to the rigid material zone is set to increase in a gradient as the absolute difference between the current curvature and the dynamic boundary curvature increases. This optimizes material performance based on the stress conditions at different locations within the rigid material zone. In regions where the curvature is close to the dynamic boundary, the sealing plate experiences relatively high stress. Increasing the amount of glass fiber adds enhances the material's rigidity and resistance to deformation, thus mitigating the stress in this area. Conversely, in regions where the difference between curvature and the dynamic boundary is large, lower rigidity is required. Appropriately reducing the amount of glass fiber adds ensures good injection molding flowability and processability. This gradient distribution approach ensures that the overall performance of the rigid material zone meets usage requirements while achieving rational material utilization. It avoids material waste or localized performance deficiencies caused by uniform addition amounts, balancing rigidity, processability, and cost.

[0059] The rigid material is made of glass fiber reinforced polypropylene or polyethylene, and the flexible material is made of hydrogenated styrene-based thermoplastic elastomer.

[0060] Specifically, the methods for optimizing the distribution of soft and hard materials in high-curvature sheet metal sealing plates include:

[0061] Step 1: Establish a material property database

[0062] Laboratory testing optimizes the temperature-related parameters of the material:

[0063] Glass fiber reinforced PP / PE (with 8% short glass fiber): Formula for determining the change in elastic modulus with temperature:

[0064] E h (T)=E h0 ×e -0.012×(T-25)；

[0065] Among them, E h (T): Elastic modulus at temperature T℃ (unit: MPa); E h0: Reference elastic modulus at 25℃ (measured value 2100MPa); T: actual operating temperature (unit: °C)

[0066] Hydrogenated TPS: Formula for determining creep rate:

[0067] ∈s(T,t)=0.0015×T×ln(t+1);

[0068] Where, ∈s: creep strain (dimensionless); T: actual operating temperature (°C); t: load duration (hours).

[0069] By establishing a materials property database, the mechanical behavior of materials at high temperatures is quantified, providing input for dynamic boundary calculations.

[0070] Step 2: 3D scanning and curvature calculation of sheet metal profile

[0071] Use a laser scanner to acquire point cloud data of the sheet metal inside the door and calculate the local curvature:

[0072]

[0073] Where K: local curvature (unit: mm) -1 ); Normal vector between adjacent measurement points; Δs: arc length between two points (unit: mm);

[0074] Generate a curvature heatmap and delineate the initial region:

[0075] When K≤0.03mm -1 At this time, it is divided into a low curvature zone (rigid plastic zone), and glass fiber reinforced PP / PE is used throughout. When K≥0.05mm -1 At that time, it was divided into a high curvature zone (soft rubber zone) and hydrogenated TPS was used throughout.

[0076] When 0.03mm -1 <K<0.05mm -1 At that time, the area is divided into transition zones, and the ratio of soft to hard rubber is allocated according to the curvature gradient. The formula for calculating the ratio of soft to hard rubber in the transition zone is as follows:

[0077]

[0078] Among them, R soft : Volume percentage of soft gel (hydrogenated TPS) in this area; K: Curvature value of the current measurement point; 0.03: Low curvature threshold; 0.02: Curvature span of the transition zone.

[0079] For example, when K = 0.04, R soft =50%, then soft and hard rubber each account for 50%. When K = 0.035, R soft =25%, then it is 25% soft rubber + 75% hard rubber.

[0080] During injection molding, a dynamic partition baffle is set in the transition zone mold, and R is pressed. soft The value controls the injection area of ​​the soft and hard adhesives. Furthermore, the joint surface of the soft and hard adhesives adopts a serrated interlocking structure to enhance the interfacial bonding force. For example, the hard material side is provided with a protrusion, and the soft material side is provided with a corresponding groove.

[0081] Step 3: Dynamic boundary optimization calculation

[0082] Input the target operating temperature T (e.g., 70℃), and calculate the dynamic boundary curvature using the data from step 1:

[0083]

[0084] Among them, Kboundary Curvature at the boundary between hard and soft materials at the current temperature (in mm) -1 ); ∈s(T,1000): creep strain of hydrogenated TPS at 70℃ / 1000 hours; E h (T), Es(T): Elastic modulus of hard and soft rubber at the current temperature; constant 0.04: Curvature of the reference boundary at 25℃; coefficient 0.2: Deformation coupling coefficient calibrated by finite element simulation;

[0085] Through dynamic boundary optimization calculations, the material boundary position is automatically adjusted according to temperature to compensate for differences in thermal deformation.

[0086] Step 4: Injection Molding Area Generation and Material Optimization

[0087] According to K boundary Re-divide the injection molding area:

[0088] When K≥K boundary At that time, it was designated as a soft rubber area and hydrogenated TPS was used. When K <K boundary At that time, the area was designated as a rigid plastic zone and glass fiber reinforced PP / PE was used.

[0089] The amount of glass fiber added in the rigid adhesive zone is distributed in a gradient:

[0090]

[0091] Among them, W f : Percentage of glass fiber by weight (range 5%-10%); max(|K|):

[0092] The absolute value of the maximum curvature of the current sheet metal.

[0093] By generating injection molding zones and optimizing materials, the rigidity of materials is enhanced in areas of abrupt curvature change, thereby suppressing interfacial stress.

[0094] In this embodiment, glass fiber reinforced PP / PE is used as the rigid material and hydrogenated TPS is used as the flexible material. The distribution of the rigid and flexible materials is optimized based on 3D scanning. The peak stress at the joint of the rigid and flexible materials is reduced by 42% (finite element analysis results at 85℃). The creep of hydrogenated TPS is reduced by 38% at 70℃. The bending stiffness of glass fiber reinforced PP / PE is increased by 55%. The dynamic boundary model reduces the amount of flexible adhesive used by 14%. The annual mass production cost is reduced by RMB 1.2 million per 100,000 vehicles.

[0095] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A high-curvature sheet metal sealing plate, characterized in that, The sealing plate body includes a low curvature matching area, a high curvature matching area, and a transition area. The low curvature matching area is injection molded from a rigid material and snaps into the low curvature area of ​​the sheet metal. The high curvature matching area is injection molded from a soft material and snaps into the high curvature area of ​​the sheet metal. The transition zone is characterized by a continuous distribution of hard and soft materials according to the curvature gradient. The sealing plate body is provided with a sealing strip along its circumferential edge.

2. The high curvature sheet metal sealing plate as described in claim 1, characterized in that, The interface between the rigid material area and the soft material area is provided with an interlocking interface structure, which includes a protrusion on the rigid material side and a corresponding groove on the soft material side.

3. The high curvature sheet metal sealing plate as described in claim 1, characterized in that, The rigid material is a glass fiber reinforced polyolefin material.

4. The high curvature sheet metal sealing plate as described in claim 3, characterized in that, The glass fiber in the glass fiber reinforced polyolefin material is 5%-10% by mass.

5. The high curvature sheet metal sealing plate as described in claim 1, characterized in that, The soft material is a weather-resistant thermoplastic elastomer.

6. A method for optimizing the distribution of soft and hard materials in a high-curvature sheet metal sealing plate as described in any one of claims 1-5, characterized in that, include: Surface geometric data of the sheet metal inside the door are obtained through 3D scanning; Calculate the local curvature values ​​at various locations on the sheet metal surface based on geometric data; The surface is divided into the following categories based on preset low curvature thresholds and high curvature thresholds: The low-curvature injection molding area is entirely made of rigid materials through injection molding; The high-curvature injection molding area is entirely made of soft material through injection molding; In the transition injection zone, the volume ratio of soft and hard materials is continuously adjusted according to the change in curvature value.

7. The method for optimizing the distribution of soft and hard materials as described in claim 6, characterized in that, The volume ratio of soft material in the transition injection molding zone is set to increase monotonically with the increase of local curvature value.

8. The method for optimizing the distribution of soft and hard materials as described in claim 6, characterized in that, Also includes: Obtain the target operating temperature parameters; Based on the temperature function of the elastic modulus of rigid materials and the temperature function of the creep strain of soft materials, the dynamic boundary curvature after temperature compensation is calculated. The boundary between the high-curvature injection molding zone and the low-curvature injection molding zone is corrected based on the dynamic boundary curvature.

9. The method for optimizing the distribution of soft and hard materials as described in claim 8, characterized in that, The amount of glass fiber added in the rigid material region is set to increase in a gradient as the absolute difference between the current curvature and the dynamic boundary curvature increases.

10. The method for optimizing the distribution of soft and hard materials as described in claim 6, characterized in that, The rigid material is made of glass fiber reinforced polypropylene or polyethylene, and the flexible material is made of hydrogenated styrene-based thermoplastic elastomer.

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