Lightweight vehicle door external hinge tool positioning mechanism and manufacturing process thereof

Abstract

The invention discloses a light-weight automobile door external hinge tool positioning mechanism and a manufacturing process thereof, and relates to the field of automobile assembly tools.The manufacturing method of the light-weight automobile door external hinge tool positioning mechanism comprises the steps that raw materials are selected from a raw material library; the density of raw materials in the raw material library is lower than that of general materials, and the general materials comprise steel and iron materials; the calculated deflection amount of the skeleton supporting rod is obtained; and the selected raw materials are used for preparing the light-weight automobile door external hinge tool positioning mechanism. Various strength parameters of a carbon fiber material and an aviation aluminum alloy material are obtained, the bending amount of a carbon fiber material framework supporting rod is calculated in combination with environment requirements, on the premise that the connection strength of the automobile door external hinge tool positioning mechanism is guaranteed, the mass of the automobile door external hinge tool positioning mechanism is reduced, workers can carry the automobile door external hinge tool positioning mechanism conveniently, and the problems that a tool sample frame is large in size and inconvenient to carry are solved. The weight is heavy, and the use is inconvenient.

Description

Technical Field

[0001] The invention relates to the field of automobile assembly tooling, and in particular to a lightweight vehicle door external hinge tooling positioning mechanism and a manufacturing process thereof. Background Art

[0002] During the production process of the welded body-in-white, it is necessary to ensure the gap surface difference between the front door, rear door, fender, etc., which directly affects the appearance quality, sealing and closing force of the vehicle. Among them, the front door is usually assembled through hinges during assembly, and is positioned and installed using an external structure, that is, the front door and the body are positioned using a tooling sample frame, so that the position of the front door on the body is under control during assembly.

[0003] Reference Figure 3 During the assembly process of the front door, the tooling sample frame 31 is first clamped and positioned on the body-in-white 3, and then the front door upper hinge 32 and the front door lower hinge 33 are respectively assembled on the mounting holes of the tooling sample frame 31, thereby realizing the positioning and installation of the front door.

[0004] In actual use, since the size of the tooling sample frame needs to fit the size of the white body, and in order to ensure the connection strength between the door and the white door, steel or iron is usually used for production. Although the rigid strength of the tooling sample frame can be guaranteed, due to the large size and heavy weight of the tooling sample frame, the transportation of the tooling sample frame for some off-road vehicles requires the use of transportation tools such as transport trucks, which increases the labor intensity of workers and is not convenient to use. Summary of the invention

[0005] The present application provides a lightweight vehicle door external hinge tooling positioning mechanism and a manufacturing process thereof, which can solve the technical problems existing in the prior art that the tooling sample frame is large in size, heavy in weight, and inconvenient to use.

[0006] In a first aspect, an embodiment of the present application provides a method for preparing a lightweight vehicle door external hinge tooling positioning mechanism, which comprises:

[0007] Selecting raw materials for preparing the skeleton support rods in the positioning mechanism of the lightweight door external hinge tooling and the raw materials for the skeleton connectors from the raw material library; the density of the raw materials in the raw material library is lower than the density of the general materials, and the general materials include steel and iron materials;

[0008] Based on the design maximum load, design length, section inertia moment of the skeleton support rod, and the elastic modulus of its raw material, the calculated deflection of the skeleton support rod is obtained;

[0009] Determining whether the calculated deflection is higher than a design deflection threshold, and determining whether a strength parameter of a raw material of the skeleton connector is within a strength parameter design range;

[0010] If both or one of them is no, then reselect the raw materials from the raw material library;

[0011] If both are true, a lightweight vehicle door external hinge tooling positioning mechanism is prepared using the selected raw materials.

[0012] In combination with the first aspect, in one embodiment, the raw materials in the raw material library include one or more of carbon fiber materials and aviation aluminum alloy materials.

[0013] In combination with the first aspect, in one embodiment, when both are yes, the raw material selected for the skeleton support rods is carbon fiber material, and the raw material selected for the skeleton connecting parts is aviation aluminum alloy material.

[0014] In combination with the first aspect, in one embodiment, the strength parameters include density, tensile strength and 0.2% yield strength;

[0015] The strength parameter design interval includes a density design interval, a tensile strength design interval and a 0.2% yield strength density interval.

[0016] In combination with the first aspect, in one embodiment, a lightweight vehicle door external hinge tooling positioning mechanism is prepared using the selected raw materials, specifically comprising:

[0017] Using the selected raw materials of the skeleton support rod to prepare the skeleton support rod;

[0018] Using the selected raw materials of the skeleton connector to prepare the skeleton connector;

[0019] The skeleton connector is installed on the skeleton support rod to form a lightweight vehicle door external hinge tooling positioning mechanism.

[0020] In combination with the first aspect, in one embodiment, the skeleton connector is installed on the skeleton support rod, specifically comprising:

[0021] Applying adhesive on the interface between the skeleton support rod and the skeleton connector;

[0022] The frame connecting member is bonded to the frame supporting rod by using the adhesive.

[0023] In combination with the first aspect, in one embodiment, before applying adhesive on the interface between the skeleton support rod and the skeleton connector, the preparation method further includes:

[0024] An adsorption film is constructed on the interface between the skeleton connector and the skeleton support rod.

[0025] In combination with the first aspect, in one embodiment, if the skeleton connector is made of aviation aluminum alloy material, constructing the adsorption film specifically includes: oxidizing the interface between the skeleton connector and the skeleton support rod to form the adsorption film.

[0026] In combination with the first aspect, in one embodiment, the oxidation treatment adopts a phosphoric acid anodizing treatment process.

[0027] In a second aspect, an embodiment of the present application provides a lightweight door external hinge tool positioning mechanism, wherein the lightweight door external hinge tool positioning mechanism is prepared based on a method for preparing a lightweight door external hinge tool positioning mechanism according to any one of claims 1 to 9 above, and the lightweight door external hinge tool positioning mechanism comprises:

[0028] A plurality of skeleton support rods, each of which is provided with a plurality of mounting holes and is made of carbon fiber material;

[0029] And, a skeleton connector, the skeleton connector connects the two skeleton support rods, and the skeleton connector and the skeleton support are bonded to each other, and the skeleton connector is made of aviation aluminum alloy material.

[0030] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0031] By obtaining various strength parameters of carbon fiber materials and aviation aluminum alloy materials and combining them with environmental requirements, the deflection of the carbon fiber skeleton support rods is calculated. Under the premise of ensuring the connection strength of the positioning mechanism of the external door hinge tooling, its weight is reduced to facilitate workers' transportation. This solves the problem that the tooling sample frame is large in size, heavy in weight, and inconvenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 This is a structural schematic diagram of a lightweight door external hinge tooling positioning mechanism in this application;

[0034] Figure 2 This is a schematic diagram of the structure of the connection between two skeleton support rods and a skeleton connector in this application;

[0035] Figure 3This is a structural schematic diagram of a lightweight door external hinge tooling positioning mechanism installed on a vehicle body in this application;

[0036] In the figure: 1. Frame support rod; 11. Mounting hole; 2. Frame connector; 21. Glue injection port; 22. Glue storage tank; 3. Body in white; 31. Tooling sample frame; 32. Front door upper hinge; 33. Front door lower hinge. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] The embodiment of the present application provides a lightweight vehicle door external hinge tooling positioning mechanism and a manufacturing process thereof, which can solve the problem that the tooling sample frame is large in size, heavy in weight, and inconvenient to use.

[0039] The present application discloses a manufacturing process for a lightweight vehicle door external hinge tooling positioning mechanism, which comprises the following steps:

[0040] S1: Selecting raw materials for preparing the skeleton support rod 1 in the positioning mechanism of the lightweight vehicle door external hinge fixture and the raw materials for the skeleton connector 2 from a raw material library; the density of the raw materials in the raw material library is lower than the density of general materials, and the general materials include steel and iron materials.

[0041] Among them, referring to the most commonly used A3 steel in general materials, its strength to density ratio is usually 59Mpa / (g / cm 3 ), in order to reduce the overall mass of the lightweight door external hinge tooling positioning mechanism while maintaining the connection strength of the lightweight door external hinge tooling positioning mechanism, the strength and density ratio of the raw materials in the raw material library must be greater than the strength and density ratio of A3 steel, so as to reduce the year-on-year mass while maintaining the strength.

[0042] After many experiments and tests, the ratio of the strength of carbon fiber resin composite materials to their density can reach 2000Mpa / (g / cm 3 ) and above, much greater than 59Mpa / (g / cm 3), so the raw material library at least contains carbon fiber resin composite materials. Among them, Japan Toray T700 carbon fiber has advantages in fields with strict requirements on density, stiffness, weight, fatigue characteristics, etc., as well as in occasions requiring high temperature and high chemical stability. Therefore, as a more detailed embodiment of the present application, Japan Toray T700 carbon fiber can be selected as a material in the raw material library of the skeleton support rod 1.

[0043] For the selection of the skeleton connector 2, its quality needs to be reduced while ensuring its connection strength, so its manufacturing material needs to have the advantages of low density and high strength.

[0044] At present, the common skeleton connector 2 is made of Q235 steel, and its strength parameters are: density 7.8g / cm 3 , tensile strength 235Mpa, 0.2% yield strength 375-500Mpa. Therefore, when selecting a new material for the skeleton connector 2, the material in the raw material library of the skeleton connector 2 has a density design range of less than 7.8g / cm 3 , the design range of tensile strength is greater than 235Mpa, and the 0.2% yield strength density range is greater than 375Mpa.

[0045] Aviation aluminum alloys have the characteristics of low density and high strength. This physical property enables aviation aluminum alloys to withstand large external forces and are not prone to plastic deformation or fracture. Therefore, as a more detailed embodiment of the present application, 7075 aluminum can be selected as a material in the raw material library of the skeleton connector 2.

[0046] S2: Based on the design maximum load and design length of the skeleton support rod 1, as well as the tensile elastic modulus and bending elastic modulus of its raw material, obtain the calculated deflection of the skeleton support rod 1; and determine whether the calculated deflection is higher than the design deflection threshold, and determine whether the strength parameters of the raw materials of the skeleton connector 2 are within the strength parameter design range.

[0047] Specifically, when the actual body-in-white is connected to the door, the skeleton support rod 1 does not bear external force but only its own gravity. Therefore, in the early design stage of the skeleton support rod 1, the degree of bending or deformation under the action of external load can be calculated based on the Japanese Toray T700 carbon fiber and the expected manufacturing dimensions of the skeleton support rod 1, that is, the deflection δ can be calculated.

[0048] According to the calculation formula of deflection δ, namely:

[0049] 1δ=5P·L3 / (348E·I)

[0050] Among them, P represents the maximum design load, L represents the design length of the skeleton support rod 1, E is the elastic modulus, and I is the section moment of inertia.

[0051] When the skeleton support rod 1 is pre-set using Japanese Toray T700 carbon fiber as raw material, it is found that the tensile elastic modulus of Japanese Toray T700 carbon fiber is 126GPa, and the bending elastic modulus is 155GPa. According to the calculation formula of the elastic modulus E, the elastic modulus E of Japanese Toray T700 carbon fiber is 155000N / mm 2 The skeleton support rod 1 is preset as a rectangular tube of 36mm×36mm×2.5mm. According to the calculation formula of the section moment of inertia I, the section moment of inertia I is 6.3×104mm 4 , since the skeleton support only bears its own gravity, assuming that each composite rectangular tube of the sample frame bears 1Kg gravity uniformly, that is, its maximum design load P = 1 × 9.8 = 9.8N. Substituting the above deflection calculation formula, it can be obtained that when the skeleton support rod 1 with a specification of 36mm × 36mm × 2.5mm is selected as the raw material using Japanese Toray T700 carbon fiber, the deflection of the skeleton support rod 1 is approximately equal to 0.05mm.

[0052] In the connection specification between the body in white and the door, it is necessary to ensure that the positioning accuracy of the skeleton support rod 1 on the body is within ±0.15mm, that is, the design deflection is 0.15. Since the 36mm×36mm×2.5mm skeleton support rod 1 made of Japanese Toray T700 carbon fiber as the raw material has a deflection of 0.05, which is less than the positioning accuracy of 0.15mm. Therefore, when Japanese Toray T700 carbon fiber is selected as the skeleton support rod 1, the overall quality of the lightweight door external hinge fixture positioning mechanism can be reduced while maintaining the connection strength of the lightweight door external hinge fixture positioning mechanism, and the skeleton support rod 1 can be produced.

[0053] During the early design stage of the skeleton connector 2, 7075 aluminum is known as an ultra-high-strength aluminum alloy, which is suitable for load-bearing structural parts used at room temperature and below 120°C, and has the advantages of easy processing, good corrosion resistance and high toughness. After testing, the specific values ​​of its physical and mechanical properties are: tensile strength 274Mpa, 0.2% yield strength 412Mpa, and density 2.83g / cm 3 .

[0054] Through comparative analysis, the tensile strength of 7075 aluminum is higher than that of Q235 steel and the 0.2% yield strength is between 375-500 MPa, so 7075 aluminum can be used as the raw material for the skeleton connector 2 for production.

[0055] S3: Use the selected raw materials to prepare a lightweight door external hinge tooling positioning mechanism.

[0056] More specifically, firstly, a plurality of skeleton support rods 1 are made by using Japanese Toray T700 carbon fiber as raw material, and a skeleton connector 2 is made by using 7075 aluminum, and then the plurality of skeleton support rods 1 and the skeleton connector 2 are assembled. The specific steps of the installation include:

[0057] Reference Figure 1-Figure 3 This embodiment is described in a state where a lightweight door external hinge tooling positioning mechanism has been assembled. In this embodiment, the skeleton support rod 1 is specifically a rectangular tube, which has good stability and load-bearing capacity. Therefore, the skeleton support rod 1 is constructed by using this structure, which can not only provide sufficient strength and rigidity for the skeleton support rod 1, but also facilitate processing and connection, so that the skeleton support rod 1 can adapt to various construction requirements; the skeleton connector 2 includes a penetration portion and a protrusion portion. The penetration portion of the skeleton connector 2 is hollow, and the hollow cross-section of the penetration portion of the skeleton connector 2 is adapted to the cross-section of a single skeleton support rod 1, so that the skeleton support rod 1 can pass through the penetration portion of the skeleton connector 2. The protrusion of the skeleton connector 2 is also adapted to the cross-section of the skeleton support rod 1 and is used to be inserted into the skeleton support rod 1. This design not only simplifies the installation process, but also enhances the stability and reliability of the connection.

[0058] More specifically, the skeleton support rod 1 is made of Japanese Toray T700 carbon fiber as the raw material, and the skeleton connector 2 is made of 7075 aluminum as the raw material, so as to ensure the structural strength of the external door hinge tooling positioning mechanism while improving the lightweight of the external door hinge tooling positioning mechanism.

[0059] In order to further reduce the overall mass of the lightweight door external hinge fixture positioning mechanism, the frame support rod 1 and the frame connector 2 are fixed by using a high-strength adhesive. Figure 1 and Figure 2 A plurality of glue injection ports 21 are provided on the penetration portion of the skeleton connector 2 to facilitate the operator to perform glue injection and bonding operations; a glue storage tank 22 is provided on the protruding portion of the skeleton connector 2 so that the operator can store high-strength adhesive in the glue storage tank 22 to further improve the bonding strength between the skeleton connector 2 and the skeleton support rod 1.

[0060] More specifically, you can choose a high-strength adhesive with the brand name 2058-4. This adhesive is a solvent-free epoxy resin adhesive, which means that no solvent is added during the preparation of the 2058-4 adhesive, thereby reducing pollution to the environment and avoiding the potential safety hazards caused by solvent volatilization. Solvent-free epoxy resin adhesives have good environmental protection and high efficiency. The 2058-4 adhesive not only has the advantage of being solvent-free, but also has excellent bonding properties and can be cured at room temperature or high temperature. Whether it is rapid curing at room temperature or achieving higher curing strength at high temperature, the 2058-4 adhesive can meet actual curing needs and provide great convenience for users. In terms of bonding strength, the 2058-4 adhesive also performs well. It has extremely high bonding strength and can firmly connect the skeleton support rod 1 and the skeleton connector 2. This high-strength bonding performance allows the 2058-4 adhesive to remain stable when subjected to high-intensity impact and vibration, making it less likely for the skeleton support rod 1 and the skeleton connector 2 to fall off or loosen. In addition, the 2058-4 adhesive also has good flexibility and can still maintain a certain degree of elasticity after curing, and can cope with a certain degree of deformation and stress. This flexibility makes the 2058-4 adhesive more reliable in some application scenarios that need to withstand dynamic loads or complex stress distribution.

[0061] More specifically, the curing of 2058-4 high-strength adhesive can be carried out in two ways: the first is to place the 2058-4 high-strength adhesive at room temperature of 20℃-25℃ for curing for 24 hours. After curing, the shear strength of the 2058-4 high-strength adhesive is not less than 110kg / cm 2 The second method is to place the 2058-4 high-strength adhesive at a high temperature of 120°C for one hour. After curing, the shear strength of the 2058-4 high-strength adhesive is not less than 180kg / cm 2 When bonding the skeleton support rod 1 and the skeleton connector 2, two different curing methods can be selected according to the actual shear strength requirements.

[0062] In order to further improve the bonding strength between the skeleton support rod 1 and the skeleton connector 2 and enhance the inherent strength of the lightweight door external hinge tooling positioning mechanism, an adsorption film is also constructed on the connecting surface of the skeleton connector 2 and the skeleton support rod 1 to enhance the bonding ability between the adhesive and the skeleton connector 2.

[0063] Specifically, before bonding, the skeleton connector 2 needs to be treated with phosphoric acid anodizing on the bonding surface between the skeleton connector 2 and the skeleton support rod 1, that is, the inner wall of the penetration part of the skeleton connector 2 and the outer wall of the protruding part of the skeleton connector 2. Phosphoric acid anodizing is a surface treatment technology widely used in the field of material protection technology. Its basic principle is to react the substances on the metal surface layer through chemical or electrochemical methods, thereby forming a reaction product film with good adhesion on the metal surface. This film can not only enhance the hardness and wear resistance of the metal surface, but also significantly improve the bonding strength between the metal and other materials.

[0064] Since the base material of the skeleton connector 2 is 7075 aluminum, after phosphoric acid anodizing, the bonding surface of the skeleton connector 2 can generate a honeycomb aluminum oxide film. The aluminum oxide film has a strong bonding force with the base aluminum, and the film layer has a strong cohesive force, and is not easy to be damaged. At the same time, it has high surface adsorption performance and good wettability to the adhesive, so it can effectively improve the tensile shear strength of the bonding pair. After testing, the bonding performance of the aluminum alloy after anodizing is greatly improved, and the tensile shear strength when bonding with the composite material is increased by nearly 104%, further improving the inherent strength of the positioning mechanism of the lightweight door external hinge tooling.

[0065] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0066] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0067] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for preparing a lightweight vehicle door external hinge tooling positioning mechanism, characterized in that: It includes: Selecting raw materials for preparing a skeleton support rod (1) in a lightweight vehicle door external hinge tooling positioning mechanism and raw materials for a skeleton connecting member (2) from a raw material library; the density of the raw materials in the raw material library is lower than the density of general materials, and the general materials include steel and iron materials; Based on the designed maximum load, designed length, section moment of inertia of the skeleton support rod (1), and the elastic modulus of its raw material, the calculated deflection amount of the skeleton support rod (1) is obtained; Determining whether the calculated deflection is higher than a designed deflection threshold, and determining whether the strength parameter of the raw material of the skeleton connector (2) is within a designed strength parameter range; If both or one of them is no, then reselect the raw materials from the raw material library; If both are true, a lightweight vehicle door external hinge tooling positioning mechanism is prepared using the selected raw materials.

2. The method for preparing a lightweight door external hinge tooling positioning mechanism according to claim 1, characterized in that: The raw materials in the raw material library include one or more of carbon fiber materials and aviation aluminum alloy materials.

3. The method for preparing a lightweight door external hinge tooling positioning mechanism according to claim 2, characterized in that: When the value is yes, the raw material selected for the skeleton support rod (1) is a carbon fiber material, and the raw material selected for the skeleton connecting member (2) is an aviation aluminum alloy material.

4. The method for preparing a lightweight door external hinge tooling positioning mechanism according to claim 1, characterized in that: The strength parameters include density, tensile strength and 0.2% yield strength; The strength parameter design interval includes a density design interval, a tensile strength design interval and a 0.2% yield strength density interval.

5. The method for preparing a lightweight vehicle door external hinge tooling positioning mechanism according to claim 1, characterized in that: The selected raw materials are used to prepare a lightweight door external hinge tooling positioning mechanism, which specifically includes: Using the selected raw materials of the skeleton support rod (1) to prepare the skeleton support rod (1); Using the selected raw material of the skeleton connecting member (2) to prepare the skeleton connecting member (2); The skeleton connecting member (2) is mounted on the skeleton supporting rod (1) to form a lightweight vehicle door external hinge tooling positioning mechanism.

6. The method for preparing a lightweight vehicle door external hinge tooling positioning mechanism according to claim 5, characterized in that: The skeleton connecting member (2) is installed on the skeleton supporting rod (1), specifically comprising: Applying adhesive on the interface between the skeleton support rod (1) and the skeleton connecting member (2); The frame connecting member (2) is bonded to the frame supporting rod (1) using the adhesive.

7. The method for preparing a lightweight vehicle door external hinge tooling positioning mechanism according to claim 6, characterized in that: Before applying adhesive on the interface between the skeleton support rod (1) and the skeleton connecting member (2), the preparation method further comprises: An adsorption film is constructed on the interface between the skeleton connecting member (2) and the skeleton supporting rod (1).

8. The method for preparing a lightweight vehicle door external hinge tooling positioning mechanism according to claim 7, characterized in that: If the skeleton connecting member (2) is made of aviation aluminum alloy material, constructing the adsorption film specifically includes: performing oxidation treatment on the interface between the skeleton connecting member (2) and the skeleton support rod (1) to form the adsorption film.

9. The method for preparing a lightweight door external hinge tooling positioning mechanism according to claim 8, characterized in that: The oxidation treatment adopts a phosphoric acid anodizing process.

10. A lightweight door external hinge tooling positioning mechanism, characterized in that: The lightweight vehicle door external hinge tool positioning mechanism is prepared based on the preparation method of a lightweight vehicle door external hinge tool positioning mechanism according to any one of claims 1 to 9 above, and the lightweight vehicle door external hinge tool positioning mechanism comprises: A plurality of skeleton support rods (1), each of which is provided with a plurality of mounting holes (11), and each of which is made of carbon fiber material; And, a skeleton connecting piece (2), wherein the skeleton connecting piece (2) connects the two skeleton support rods (1), and the skeleton connecting piece (2) and the skeleton support (1) are bonded to each other, and the skeleton connecting piece (2) is made of aviation aluminum alloy material.

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