Structure, machining die and forming method of back door outer plate

Abstract

The invention discloses a back door outer plate structure, a machining die and a forming method, the back door outer plate structure comprises an assembling face used for assembling a car door outer decoration plate and an appearance face which is fixedly connected to the edge of the upper side and the edge of the lower side of the assembling face and is of an integrated structure with the assembling face, and a plurality of mounting holes used for assembling the car door outer decoration plate are formed in the assembling face. The edges of the upper side and the lower side of the assembling face are each provided with at least one process supplementing rib, and each process supplementing rib is in lap joint with the multiple installing holes. The process supplementing ribs are innovatively arranged on the edges of the upper side and the lower side of the assembling face of the back door outer plate and are in lap joint with the multiple mounting holes. Through ingenious lap joint of the process supplement rib and the mounting hole, the local forming force of the boss of the mounting hole is isolated and cannot be transmitted to the appearance surface, local deformation and instability of the plate caused by local forming of the boss of the mounting hole are avoided, and defects caused to the appearance surface near the boss of the mounting hole are further prevented.

Description

Technical Field

[0001] The invention relates to the technical field of automobile component structure and processing, and in particular to a structure, a processing mold and a molding method of a back door outer panel. Background Art

[0002] With the rapid development of the automobile industry, the development cycle of new cars is getting shorter and shorter, and the requirements for product quality and appearance are getting higher and higher. However, it is currently difficult for domestic molds to achieve zero deformation in surface product manufacturing, and the mold debugging cycle is long.

[0003] The back door outer panel has a complex shape and a large forming depth, which puts higher requirements on the early stamping process and CAE analysis. At present, CAE synchronous analysis is performed during product design. In the design stage, the problems that may occur in the later manufacturing process are exposed, and the hidden dangers of production and manufacturing are solved through product design, process optimization and other technical means, so as to avoid the risks of later manufacturing and shorten the development cycle. The back door mounting hole boss first contacts the sheet material during the forming process, which will cause the sheet material at this position to deform and become unstable, thereby causing appearance defects around the back door mounting hole boss. In order to deal with the depression on the appearance surface caused by the molding of the back door mounting hole boss, the general method is to reduce the height of the back door mounting hole boss or move the back door mounting hole away from the appearance surface.

[0004] However, lowering the height of the boss of the tailgate mounting hole will affect the matching installation of the tailgate and the exterior panel; arranging the tailgate mounting hole away from the exterior surface will cause the exterior panel to be fixed far away and the edge of the exterior panel to warp, affecting the appearance of the vehicle. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and provide a structure, processing mold and forming method of a back door outer panel that does not require adjustment of the back door mounting hole boss height and the back door mounting hole position and ensures the back door outer panel shape and assembly requirements.

[0006] To achieve this object, the structure of the back door outer panel designed in the present invention includes an assembly surface for assembling a door exterior panel and an appearance surface fixedly connected to the upper and lower edges of the assembly surface and forming an integral structure with the assembly surface. The assembly surface is provided with a plurality of mounting holes for assembling the door exterior panel, and the upper and lower edges of the assembly surface are respectively provided with at least one process supplementary rib, and each of the process supplementary ribs overlaps with a plurality of the mounting holes.

[0007] Furthermore, the mounting holes include a plurality of upper mounting holes opened on the upper portion of the assembly surface and arranged at intervals along the length direction of the assembly surface; the process supplementary ribs include an upper process supplementary rib located at the upper edge of the assembly surface, arranged along the length direction of the assembly surface, and overlapping the upper edges of the plurality of upper mounting holes.

[0008] Furthermore, the upper process supplementary rib is a groove structure.

[0009] Furthermore, the mounting holes include a plurality of lower mounting holes opened at the lower portion of the assembly surface and arranged at intervals along the length direction of the assembly surface; the process supplementary ribs include a lower process supplementary rib located at the lower edge of the assembly surface, arranged along the length direction of the assembly surface, and overlapping the lower edges of the plurality of lower mounting holes.

[0010] Furthermore, the lower process supplementary rib is a groove structure.

[0011] Furthermore, a processing mold for a tailgate outer panel comprises an upper mold and a lower mold, and the upper mold and the lower mold are combined to process the structure of the tailgate outer panel, and the lower surface of the upper mold and the upper surface of the lower mold are respectively provided with an upper mold process supplementary rib processing structure and a lower mold process supplementary rib processing structure which correspond to each other and can process the process supplementary ribs by combining the molds.

[0012] Furthermore, the upper die process supplementary rib processing structure includes upper die convex ribs; the lower die process supplementary rib processing structure includes lower die concave ribs.

[0013] Still further, a molding method of a back door outer panel structure is implemented by means of a processing mold for the back door outer panel, wherein the upper mold is molded together with the lower mold, and the upper mold process supplementary rib processing structure cooperates with the lower mold process supplementary rib processing structure to process the process supplementary ribs.

[0014] Furthermore, when the upper mold is at a distance L1 before it is bottomed out, the upper mold mounting hole boss located on the lower surface of the upper mold and used to process the mounting hole contacts the sheet material, and when the upper mold is at a distance L2 before it is bottomed out, the upper mold process supplementary rib processing structure contacts the sheet material, L1>L2, and the difference between L1 and L2 does not exceed the set value L3.

[0015] Furthermore, L3 does not exceed 2 mm.

[0016] The beneficial effects of the present invention are as follows: the upper and lower edges of the assembly surface of the back door outer panel are innovatively provided with process supplementary ribs, which overlap with multiple mounting holes. The clever overlap of the process supplementary ribs and the mounting holes separates the force of the local forming of the mounting hole boss, so that it cannot be transmitted to the appearance surface, avoiding the local deformation and instability of the sheet material due to the local forming of the mounting hole boss, and thus preventing defects in the appearance surface near the mounting boss. In addition, the added process modeling supplement avoids the concave defects of the appearance surface caused by uneven force on the sheet material, and improves the appearance quality of the back door outer panel. From the principle of mechanics, the process supplementary ribs are like multiple reinforcing ribs. When the back door outer panel is impacted by external force, it can effectively disperse the stress and prevent stress concentration from causing deformation of the sheet material. For example, when a vehicle encounters a bumpy road or a slight collision, the back door outer panel can maintain good structural integrity with the process supplementary ribs, reduce the influence of deformation on the appearance and performance, and extend the service life. The upper mounting holes are arranged at intervals along the length direction of the upper part of the assembly surface, and the lower mounting holes are arranged at intervals along the length direction of the lower part of the assembly surface. After the door trim is installed, the evenly distributed mounting holes can firmly fix it on the back door outer panel to prevent it from loosening due to vibration during driving. Moreover, the evenly distributed mounting holes can evenly disperse the external force to the entire back door outer panel to avoid excessive local force. For example, when driving at high speed, the airflow exerts a large pressure on the door trim. The optimized mounting hole layout can ensure that the back door outer panel and the door trim are under pressure together, ensuring the stability and safety of the vehicle appearance. The upper and lower process supplementary ribs adopt a groove structure. From the perspective of material utilization, while ensuring the improvement of structural strength, the material usage is reduced, the overall weight of the back door outer panel is reduced, which is in line with the trend of lightweight automobiles and reduces vehicle energy consumption. During the processing process, the groove structure provides a reasonable channel for material flow. During stamping and other processing, the material can flow and fill smoothly in the groove, reducing processing defects such as wrinkles and cracks caused by poor material flow, and improving the product yield. The back door outer panel processing mold consists of an upper mold and a lower mold. The lower surface of the upper mold and the upper surface of the lower mold are provided with corresponding upper mold process supplementary rib processing structures and lower mold process supplementary rib processing structures. When the mold is closed, the various parts of the mold can be accurately docked, and the processing size and shape of the process supplementary ribs are strictly controlled to ensure that each processed back door outer panel has process supplementary ribs that meet the design requirements, effectively guaranteeing the product processing accuracy and quality, and laying the foundation for subsequent assembly and use. The upper mold process supplementary rib processing structure adopts the upper mold convex rib, and the lower mold process supplementary rib processing structure adopts the lower mold concave rib. This convex-concave matching structure is simple and efficient. From the perspective of processing and manufacturing, the upper mold convex rib and the lower mold concave rib are easy to process and form in mold manufacturing, without complex processes and high costs, reducing the difficulty and cost of mold manufacturing. When the back door outer panel is closed, the upper mold convex rib and the lower mold concave rib cooperate closely, accurately extrude the plate, form the required process supplementary rib shape, and ensure processing quality and accuracy. When the upper die is L1 distance away from the bottom of the mold, the boss of the upper die mounting hole contacts the sheet; when the distance is L2 distance away from the bottom, the upper die process supplementary rib processing structure contacts the sheet, and L1>L2, and the difference between L1 and L2 does not exceed 2mm.This precise molding sequence ensures that the mounting holes and process supplementary ribs are formed in sequence, avoiding mutual interference, ensuring the accuracy and integrity of the structure of each part of the back door outer panel, and improving the molding quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the back door outer panel without the process supplementary ribs arranged in the present invention;

[0018] Figure 2 It is a front view of the back door outer panel arranged with process supplementary ribs in the present invention;

[0019] Figure 3 It is a front view of the assembly of the back door outer panel and the door outer trim panel arranged with the process supplementary ribs in the present invention;

[0020] Figure 4 for Figure 3 Middle AA section view;

[0021] Figure 5 A three-dimensional view of the mold assembly of the back door outer panel processing mold of the present invention;

[0022] Figure 6 An exploded view of a processing mold for a back door outer panel in the present invention;

[0023] Figure 7 A top view of the lower mold of the present invention;

[0024] Figure 8 for Figure 7 Middle BB section view;

[0025] Fig. 9 A bottom view of the upper die in the present invention;

[0026] Fig.10 for Fig. 9 Middle CC section view;

[0027] Among them, 1—assembly surface, 2—upper mounting hole, 3—upper process supplementary rib, 4—lower mounting hole, 5—lower process supplementary rib, 6—upper appearance surface, 7—lower appearance surface, 8—door exterior panel, 9—upper die, 10—lower die, 11—upper die seat, 12—lower die seat, 13—upper die convex rib, 14—lower die concave rib, 15—upper die mounting hole boss, 16—lower die mounting hole, 17—exterior panel boss. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0029] like Figure 1 The structure of the back door outer panel shown in FIG. 4 includes an assembly surface 1 for assembling a door outer trim panel 8 and an appearance surface fixedly connected to the upper and lower edges of the assembly surface 1 and forming an integral structure with the assembly surface 1. The appearance surface includes an upper appearance surface 6 and a lower appearance surface 7. The assembly surface 1 is provided with a plurality of mounting holes for assembling the door outer trim panel 8. The mounting holes include a plurality of lower mounting holes 4 arranged at intervals along the length direction of the assembly surface 1 at the lower part of the assembly surface 1 and a plurality of upper mounting holes 2 arranged at intervals along the length direction of the assembly surface 1 at the upper part of the assembly surface 1. A plurality of outer trim panel bosses 17 cooperating with the upper mounting holes 2 and the lower mounting holes 4 are provided on the inner side surface of the door outer trim panel 8.

[0030] In some embodiments, a process supplement rib is respectively provided on the upper and lower edges of the assembly surface 1, which includes an upper process supplement rib 3 located at the upper edge of the assembly surface 1, arranged along the length direction of the assembly surface 1, and overlapping the upper edges of the multiple upper mounting holes 2, and a lower process supplement rib 5 located at the lower edge of the assembly surface 1, arranged along the length direction of the assembly surface 1, and overlapping the lower edges of the multiple lower mounting holes 4. The upper process supplement rib 3 and the lower process supplement rib 5 are both groove structures.

[0031] The exterior surface of the back door outer panel is composed of an upper exterior surface 6 and a lower exterior surface 7, and is an integral structure with the assembly surface 1. This integrated design greatly enhances the overall structural strength and stability of the back door outer panel. During vehicle driving, facing various complex mechanical environments, such as wind pressure during high-speed driving, vibrations caused by road bumps, etc., the integrated structure can better disperse stress and avoid problems such as cracking and deformation of the exterior surface caused by stress concentration, thereby ensuring the appearance integrity and aesthetics of the back door outer panel and improving the overall quality of the vehicle. The upper mounting holes 2 opened on the assembly surface 1 are arranged at intervals along the upper length direction of the assembly surface 1, and the lower mounting holes 4 are arranged at intervals along the lower length direction of the assembly surface 1. This layout design fully considers the installation requirements and mechanical distribution of the door exterior trim 8. On the one hand, the evenly distributed mounting holes above and below enable the door trim panel 8 to be more firmly fixed on the back door outer panel after installation, effectively preventing the door trim panel 8 from loosening due to factors such as vibration and airflow impact during vehicle driving, thereby ensuring the stability of the vehicle appearance; on the other hand, the evenly distributed mounting holes can evenly disperse the external force to the entire back door outer panel, avoiding excessive local force, and improving the bearing capacity and durability of the back door outer panel. The multiple outer trim panel bosses 17 arranged on the inner surface of the door trim panel 8 cooperate with the upper mounting holes 2 and the lower mounting holes 4 on the back door outer panel assembly surface 1. This precise matching design makes the assembly process of the door trim panel 8 simple and efficient. During assembly, workers only need to align the outer trim panel bosses 17 with the corresponding mounting holes for installation, which greatly shortens the assembly time, improves assembly efficiency, reduces labor costs, and is conducive to the large-scale production of automobiles. At the same time, the close fit can also effectively reduce the gap between the door trim panel 8 and the back door outer panel, and improve the sealing and sound insulation performance of the vehicle. The matching connection mode between the outer panel boss 17 and the mounting hole can provide stable connection strength. During the driving process of the vehicle, whether it encounters severe bumps or strong airflow impact at high speed, the door outer panel 8 can be firmly fixed on the back door outer panel through the close matching between the outer panel boss 17 and the mounting hole, ensuring the integrity and safety of the vehicle appearance. The upper process supplementary rib 3 overlaps the upper edge of the multiple upper mounting holes 2, and the lower process supplementary rib 5 overlaps the lower edge of the multiple lower mounting holes 4. From the perspective of mechanical principles, the process supplementary ribs are like adding multiple reinforcing ribs to the back door outer panel. When the back door outer panel is impacted by external force, these process supplementary ribs can effectively disperse stress and avoid deformation of the plate caused by stress concentration. For example, when the vehicle is slightly collided or subjected to greater wind pressure, the process supplementary ribs can bear part of the external force, protect the main structure of the back door outer panel, reduce the risk of deformation, and thus extend the service life of the back door outer panel. The setting of the process supplementary ribs optimizes the processing technology of the back door outer panel to a certain extent.In the process of stamping and other processing, process supplementary ribs can guide the flow of materials, so that the materials can be more evenly distributed in the mold, reduce processing defects such as wrinkles and cracks caused by poor material flow, and improve the product yield. At the same time, reasonable process supplementary rib design can also reduce processing difficulty, improve processing efficiency, and reduce production costs.

[0032] Embodiment 1

[0033] Based on some of the above embodiments, a processing mold for a back door outer panel is provided, such as Figure 5 As shown in FIG. 10, the upper mold 9 and the lower mold 10 are combined to form a structure of a back door outer panel, and the lower surface of the upper mold 9 and the upper surface of the lower mold 10 are respectively provided with an upper mold process supplementary rib processing structure and a lower mold process supplementary rib processing structure which correspond to each other and can supplement ribs through the mold combination processing process. The upper mold process supplementary rib processing structure includes an upper mold convex rib 13, and the lower mold process supplementary rib processing structure includes a lower mold concave rib 14.

[0034] The processing mold of the back door outer panel is composed of an upper mold 9 and a lower mold 10, and the upper mold 9 and the lower mold 10 are molded together to process the back door outer panel structure. An upper mold convex rib 13 is set on the lower surface of the upper mold 9 as the upper mold process supplementary rib processing structure, and a lower mold concave rib 14 is set on the upper surface of the lower mold 10 as the lower mold process supplementary rib processing structure. When the back door outer panel is processed, the upper mold 9 and the lower mold 10 are molded together, and the upper mold convex rib 13 and the lower mold concave rib 14 correspond to each other, which can accurately press out the process supplementary ribs that meet the design requirements on the upper and lower edges of the assembly surface of the back door outer panel, ensuring the dimensional accuracy and shape accuracy of the process supplementary ribs, and providing a strong guarantee for improving the structural strength of the back door outer panel and optimizing the processing technology. The structural design of the upper mold convex rib 13 and the lower mold concave rib 14 is simple and easy to process and shape during the mold manufacturing process. Compared with complex processing structures, this convex-concave matching method not only reduces the manufacturing difficulty and cost of the mold, but also can quickly and efficiently complete the processing of the process supplementary ribs during the mold closing process, thereby improving production efficiency. At the same time, the simple structure also facilitates the maintenance and care of the mold, extending the service life of the mold.

[0035] Embodiment 2

[0036] On the basis of the above-mentioned embodiment 1, a forming method of a back door outer panel structure is provided, which is realized by a processing mold of the back door outer panel, the upper mold 9 is molded with the lower mold 10, the upper mold process supplementary rib processing structure cooperates with the lower mold process supplementary rib processing structure, and the process supplementary rib is processed. When the upper mold 9 is L1 distance away from the bottom of the mold, the upper mold mounting hole boss 15 located on the lower surface of the upper mold 9 and used for processing the mounting hole contacts the sheet material, and when the upper mold 9 is L2 distance away from the bottom, the upper mold process supplementary rib processing structure contacts the sheet material, L1>L2, the difference between L1 and L2 does not exceed the set value L3, and L3 does not exceed 2mm.

[0037] The forming of the back door outer panel structure is achieved by a processing mold composed of an upper mold 9 and a lower mold 10. During the mold closing process, when the upper mold 9 is L1 away from the bottom of the mold closing, the upper mold mounting hole boss 15 located on the lower surface of the upper mold 9 first contacts the sheet material. At this time, the upper mold mounting hole boss 15 begins to perform preliminary stamping on the sheet material, so that the sheet material gradually forms the prototype of the mounting hole. As the upper mold 9 continues to move downward, when it is L2 away from the bottom of the mold closing, the upper mold process supplementary rib processing structure (upper mold convex rib 13) contacts the sheet material and begins to perform process supplementary rib forming processing on the sheet material. Since L1>L2, it is ensured that the processing of the mounting hole precedes the process supplementary rib, so that the entire forming process is carried out in an orderly manner, avoiding mutual interference between the two during the forming process. The difference between L1 and L2 does not exceed the set value L3, and L3 does not exceed 2mm. This precise parameter control is crucial. On the one hand, a reasonable difference can ensure the forming quality of the mounting hole and the process supplementary rib, and avoid forming defects caused by too large or too small time interval between the two. For example, if the difference between L1 and L2 is too large, the sheet material may be deformed unnecessarily while waiting for the process supplementary ribs to be formed after the mounting holes are formed; if the difference is too small, the two may be formed at the same time, affecting each other's forming accuracy. On the other hand, precise parameter control is conducive to improving the stability and consistency of production, and is convenient for effective control of product quality in large-scale production. Through this precise parameter control and orderly forming steps, the forming of the back door outer panel structure can be completed efficiently and with high quality to meet the needs of automobile production.

[0038] In summary, the present invention provides a structure, a molding die and a process method for solving the problem of depression around the mounting hole boss of the back door outer panel. It includes adding a process shape (process supplementary rib) between the mounting hole boss and the appearance surface, and the process supplementary rib is in a non-exposed area and does not affect the appearance of the vehicle. The molding simulation analysis is performed through CAE, and the size of the process supplementary rib is adjusted according to the analysis results until the molding of the mounting hole boss does not cause a depression in the appearance surface. In some instances, the width of the process supplementary rib is 10mm and the depth is 4mm. The center of the process supplementary rib is about 10mm away from the edge of the exterior panel boss 17. During molding, 5mm (L1) before the mold is closed to the bottom, the mounting hole boss just contacts the sheet material, and the sheet material is slightly deformed, and no defects are caused to the appearance surface. The mold continues to close, and 3mm (L2) before the bottom, at this time the process supplementary rib begins to contact the sheet material. Since the process supplementary ribs that pass through the left and right contact the sheet material at the same time, the sheet material is subjected to force at the same time and the force is uniform during molding. The force of local forming of the mounting hole boss is separated by the process supplementary ribs and cannot be transmitted to the appearance surface. The local deformation and instability of the sheet metal caused by the local forming of the mounting hole boss will not cause defects on the appearance surface near the mounting hole boss. After that, the mold is closed to the bottom, and the process supplementary ribs effectively prevent defects on the appearance surface caused by local deformation and instability of the sheet metal.

[0039] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be construed as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solution of the present invention is limited only by the scope of the claims. In the case of using "including", "having" and "comprising" described in this specification, there may also be another part or other parts, and the terms used may generally be singular but may also represent plural forms. Finally, it should be pointed out that the above embodiments are only more representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments, and there may be many variations. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention shall be deemed to belong to the protection scope of the present invention.

Claims

1. A back door outer panel structure, comprising an assembly surface (1) for assembling a door outer panel (8) and an appearance surface fixedly connected to the upper and lower side edges of the assembly surface (1) and forming an integral structure with the assembly surface (1), wherein the assembly surface (1) is provided with a plurality of mounting holes for assembling the door outer panel (8), characterized in that: At least one process supplementary rib is respectively arranged on the upper and lower side edges of the assembly surface (1), and each of the process supplementary ribs overlaps with a plurality of the mounting holes.

2. The back door outer panel structure according to claim 1, characterized in that: The mounting holes include a plurality of upper mounting holes (2) opened on the upper part of the mounting surface (1) and arranged at intervals along the length direction of the mounting surface (1); the process supplementary ribs include an upper process supplementary rib (3) located at the upper edge of the mounting surface (1), arranged along the length direction of the mounting surface (1), and overlapping the upper edges of the plurality of upper mounting holes (2).

3. The back door outer panel structure according to claim 2, characterized in that: The upper process supplementary rib (3) is a groove type structure.

4. The back door outer panel structure according to any one of claims 1 to 3, characterized in that: The mounting holes include a plurality of lower mounting holes (4) opened at the lower part of the mounting surface (1) and arranged at intervals along the length direction of the mounting surface (1); the process supplementary ribs include a lower process supplementary rib (5) located at the lower edge of the mounting surface (1), arranged along the length direction of the mounting surface (1), and overlapping the lower edges of the plurality of lower mounting holes (4).

5. The back door outer panel structure according to claim 4, characterized in that: The lower process supplementary rib (5) is a groove type structure.

6. A processing mold for a back door outer panel, comprising an upper mold (9) and a lower mold (10), characterized in that: The upper mold (9) and the lower mold (10) are combined to process the structure of the back door outer panel as described in any one of claims 1 to 5, and the lower surface of the upper mold (9) and the upper surface of the lower mold (10) are respectively provided with an upper mold process supplementary rib processing structure and a lower mold process supplementary rib processing structure which correspond to each other and can process the process supplementary ribs by combining the molds.

7. The processing mold for the back door outer panel according to claim 6, characterized in that: The upper die process supplementary rib processing structure comprises an upper die convex rib (13); and the lower die process supplementary rib processing structure comprises a lower die concave rib (14).

8. A method for forming a back door outer panel structure, characterized in that: It is realized by the processing mold of the back door outer panel according to claim 6 or 7, the upper mold (9) and the lower mold (10) are molded together, and the upper mold process supplementary rib processing structure cooperates with the lower mold process supplementary rib processing structure to process the process supplementary rib.

9. The method for forming a back door outer panel structure according to claim 8, characterized in that: When the upper mold (9) is at a distance of L1 before the mold is closed, the upper mold mounting hole boss (15) located on the lower surface of the upper mold (9) and used to process the mounting hole contacts the sheet material, and when the upper mold (9) is at a distance of L2 before the mold is closed, the upper mold process supplementary rib processing structure contacts the sheet material, L1>L2, and the difference between L1 and L2 does not exceed the set value L3.

10. The method for forming a back door outer panel structure according to claim 9, characterized in that: The L3 does not exceed 2 mm.

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