Clamping structure of back door plate and gluing method

Abstract

The invention discloses a clamping structure of a back door plate and a gluing method, and relates to the technical field of automobile part assembly.The clamping structure of the back door plate comprises an inner plate, an inner protection plate and a plurality of buckles, the inner protection plate is installed on the inner plate and provided with a plurality of installation bases, the buckles are clamped in the inner plate, and the inner protection plate is provided with a plurality of installation bases; the buckle is arranged on the mounting seat and used for fixing the inner protection plate, the buckle comprises a mounting part and a fixing part, the mounting part is arranged on the mounting seat, and the fixing part is arranged on the mounting part, extends towards the inner plate in a wave shape and is used for absorbing tension. Through the multi-section elastic deformation of the wave-shaped fixing part, the assembly stress is gradually attenuated in a plurality of deformation intervals, and the residual stress transmitted to the outer plate is remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of the clamping structure and gluing method of a rear door panel, and particularly relates to a clamping structure and gluing method of a rear door panel. Background Art

[0002] In the manufacturing field, as an important part of a vehicle body, the structural integrity and appearance quality of a rear door are crucial. The rear door is usually composed of an inner panel, an inner plate, and an outer panel. Among them, the inner panel is installed on the inner plate of the rear door and is clamped and assembled with the inner plate through a plurality of clips. The outer panel is supported and fixed to the inner plate and surrounding structures by gluing to achieve a sealed and aesthetic appearance effect.

[0003] Due to the inevitable influence of manufacturing factors in the manufacturing process of parts, such as fluctuations in die accuracy and differences in stamping process stability, as well as the accumulation of dimensional tolerances of each part itself, there are often assembly stresses in the inner panel during assembly. When the inner panel is forcibly fixed to the inner plate in a clamping manner, these stresses are transmitted to the gluing part connected to the outer panel, and then pits are pulled out on the rear door panel, seriously affecting the appearance quality of the rear door, resulting in an increase in the product rejection rate and an increase in production costs. Summary of the Invention

[0004] The main object of the present invention is to propose a clamping structure and gluing method of a rear door panel, aiming to eliminate assembly profits and prevent pits from being pulled out on the rear door panel, which affects the appearance.

[0005] To achieve the above object, the clamping structure and gluing method of the rear door panel proposed by the present invention include:

[0006] Inner plate;

[0007] Inner panel, installed on the inner plate and provided with a plurality of mounting seats;

[0008] A plurality of clips, clamped inside the inner plate for fixing the inner panel. The clip includes a mounting portion and a fixing portion. The mounting portion is arranged on the mounting seat, and the fixing portion is arranged on the mounting portion and extends towards the inner plate in a wavy shape for absorbing tensile force.

[0009] Preferably, the wave crests and wave troughs of the fixing portion are alternately distributed, and the number of wave crests is greater than or equal to three.

[0010] Preferably, the material of the fixing portion is silicone or thermoplastic polyurethane elastomer.

[0011] Preferably, the mounting portion is provided with a locking structure for restricting the mounting portion from detaching from the mounting seat.

[0012] Preferably, a connection groove is formed in the mounting seat, and the locking structure includes a clamping block which is inserted into the connection groove.

[0013] Preferably, the clamping block is in the shape of an inverted hook or a wedge-shaped protrusion to prevent the buckle from detaching from the mounting seat when the clamping block rotates.

[0014] In addition, to achieve the above object, the present application also provides a method for applying glue to the rear door panel, which includes:

[0015] Dividing the glue application area of the inner rear door panel into a high-elasticity area and a four-corner stress concentration support area;

[0016] Applying silicone rubber with Shore A hardness of 35 in the high-elasticity area;

[0017] Applying epoxy resin with Shore D hardness of 60 in the support area.

[0018] Preferably, applying the silicone rubber with Shore A hardness of 35 includes:

[0019] The width of the silicone rubber with Shore A hardness of 35 is less than 8.5 mm and greater than 7.5 mm;

[0020] The thickness of the silicone rubber with Shore A hardness of 35 is less than 1.3 mm and greater than 1.1 mm.

[0021] Preferably, the width of the epoxy resin with Shore D hardness of 60 is less than 15.5 mm and greater than 14.5 mm;

[0022] The thickness of the epoxy resin with Shore D hardness of 60 is less than 0.9 mm and greater than 0.7 mm.

[0023] Preferably, a two-component cartridge glue application robot is used for glue application, and the glue type is switched through program control;

[0024] The switching time is less than or equal to 5 seconds.

[0025] In the technical solution provided by the present invention, the multiple buckles are clamped inside the inner panel and used to fix the inner guard plate. The buckle includes a mounting portion and a fixing portion. The mounting portion is arranged on the mounting seat, and the fixing portion is arranged on the mounting portion and extends towards the inner panel in a wavy shape for absorbing tensile force. Through the multi-stage elastic deformation of the wavy fixing portion, the assembly stress is gradually attenuated in multiple deformation intervals, significantly reducing the residual stress transmitted to the outer panel. Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0027] Figure 1 Schematic perspective view of an embodiment of the clamping structure of the back door panel provided by the present invention;

[0028] Figure 2 For Figure 1 Schematic structural view of the inner guard plate in

[0029] Figure 3 For Figure 2 Schematic structural view of the buckle in

[0030] Figure 4 For Figure 2 Schematic side view of the buckle in

[0031] Figure 5 Schematic flow chart of an embodiment of the glue coating method for the door panel provided by the present invention.

[0032] Explanation of the reference numerals in the drawings:

[0033] 1. Inner plate; 2. Inner guard plate; 3. Mounting seat; 31. Mounting part; 32. Fixing part; 4. Buckle.

[0034] The realization of the object of the present invention, its functional features and advantages will be further described in conjunction with the embodiments and with reference to the drawings. Detailed embodiments

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, rather than all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0036] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] The present invention provides a clamping structure and a gluing method for a back door panel. Figures 1 to 4 This is an embodiment of the clamping structure and the gluing method for the back door panel provided by the present invention.

[0039] During the assembly process of an automotive back door, when the inner panel 2 is fixed to the inner plate 1 through clips, due to the accumulation of component size tolerances and the differences in die precision, the assembly stress will be transmitted to the gluing part of the back door panel, resulting in pits being pulled out on the outer panel. Such problems are particularly obvious when there are fluctuations in the stamping process or insufficient component matching accuracy, seriously affecting the appearance quality of the back door and increasing the production cost.

[0040] Please refer to Figures 1 to 2 , the clamping structure of the back door panel includes an inner plate 1, an inner panel 2, and a plurality of buckles 4. Among them, the inner panel 2 is installed on the inner plate 1 and is provided with a plurality of mounting seats 3. The plurality of buckles 4 are clamped inside the inner plate 1 for fixing the inner panel 2. The buckle 4 includes a mounting portion 31 and a fixing portion 32. The mounting portion 31 is disposed on the mounting seat 3, and the fixing portion 32 is disposed on the mounting portion 31 and extends in a wavy shape towards the inner plate 1 for absorbing tensile force.

[0041] The wavy extension refers to the continuous undulating form of the fixing portion 32 in the longitudinal section, which can be specifically realized by stamping or injection molding processes. Its wave crests and wave troughs are alternately distributed to form an elastic deformation zone. The mounting portion 31 refers to the basic structure connected to the inner panel 2, which can be specifically realized by a columnar body with a locking protrusion, and is fixed by the cooperation of the clamping block and the connecting groove of the mounting seat 3. The material selection of the fixing portion 32 needs to consider both elasticity and durability. For example, a thermoplastic elastomer material is used to enable controllable deformation when subjected to tensile force.

[0042] When the buckle 4 is installed, the mounting portion 31 is embedded in the mounting seat 3 of the inner guard plate 2 and is prevented from falling off by the locking structure. The fixing portion 32 bends and extends toward the tailgate inner panel 1, forming a multi-segment wavy structure. When the inner guard plate 2 is displaced due to assembly tolerances, the fixing portion 32 is subjected to tension, and its wavy segment produces elastic stretching or compression deformation, converting the linear tension into deformation energy in multiple directions, thereby dispersing stress concentration and preventing tension from directly acting on the outer panel glue coating area. During the assembly process of the inner guard plate 2, the assembly stress generated by the accumulated tolerances is absorbed, and the concentrated transmission of tension to the tailgate panel is avoided, thereby preventing pit defects from appearing on the outer panel surface, effectively improving the overall appearance quality of the tailgate, and reducing production cost losses due to rework or scrapping.

[0043] Therefore, in the technical solution provided by the present invention, the multiple clips 4 are clipped into the inner panel 1 to fix the inner guard panel 2. The clips 4 include a mounting portion 31 and a fixing portion 32. The mounting portion 31 is arranged on the mounting seat 3, and the fixing portion 32 is arranged on the mounting portion 31 and extends in a wave shape toward the inner panel 1 to absorb tension. Through the multi-stage elastic deformation of the wave-shaped fixing portion 32, the assembly stress is gradually attenuated in multiple deformation intervals, thereby significantly reducing the residual stress transmitted to the outer panel.

[0044] Please also refer to Figures 3 to 4 The arrangement of the waves and the number of crests need to be limited to avoid structural instability after installation and inability to effectively absorb tension. Specifically, in an embodiment of the present invention, the crests and troughs of the fixing portion 32 are alternately distributed, and the number of the crests is greater than or equal to three.

[0045] The alternating distribution of crests and troughs means that the fixing portion 32 forms a continuous wavy undulating structure, for example, three crests and two troughs are formed in an alternating arrangement through a molding process, so that when subjected to force, the crests and troughs deform cooperatively to disperse the stress; the number of crests is greater than or equal to three means that there are at least three crests in the fixing portion 32. For example, when four crests are used, each crest can correspond to assembly stress in different directions, and uniform stress distribution is achieved by increasing the contact points.

[0046] When the fixing portion 32 is subjected to tension, each crest and trough of its wavy structure participates in deformation, with the crests acting as stress support points and the troughs as elastic buffers. When the inner guard plate 2 is displaced due to assembly tolerances, the multiple crests work together to decompose the tensile force into deformations in different directions, while the bending deformation of the troughs further extends the stress transmission path. For example, a three-crest structure forms a triangular support surface, avoiding localized stress concentration. Through the synergistic effect of multi-point support and elastic deformation, a single-point impact load is converted into dispersed deformations along multiple crests and troughs, thereby reducing the peak stress per unit area.

[0047] Furthermore, the material of the fixing portion 32 is silicone or thermoplastic polyurethane elastomer. Silicone refers to a high-molecular elastic material composed of siloxane polymers, and specifically, it can be realized by using methyl vinyl silicone rubber or addition-curing liquid silicone. Its molecular chain segments have the ability of reversible deformation and can absorb mechanical stress through the stretching and curling of molecular chains when stressed. Thermoplastic polyurethane elastomer refers to a linear block copolymer composed of alternating soft segments and hard segments, and specifically, it can be realized by using polyester-type or polyether-type thermoplastic polyurethane. Its hard segments provide physical cross-linking points, and the soft segments endow the material with elastic recovery characteristics.

[0048] When the inner guard plate 2 is assembled with the inner plate 1, the fixing portion 32 in the wavy extension state is subjected to tensile or compressive forces due to manufacturing tolerances or assembly stresses. At this time, the molecular chains of the silicone or thermoplastic polyurethane elastomer generate elastic deformation through local orientation or phase transformation, converting the assembly stress into internal energy dissipation of the material, thereby preventing the stress from being transmitted to the back door panel along the buckle 4. After the assembly is completed, the elastic modulus of the material enables it to maintain the pre-tight contact state between the fixing portion 32 and the inner plate 1, and through the controllable elastic deformation characteristics, it actively absorbs the mechanical energy during the assembly process while maintaining the structural stability and blocking the stress transmission path.

[0049] The wavy fixing portion 32 may be damaged during subsequent disassembly and repair processes. In order to prevent the inner guard plate 2 from being damaged due to secondary welding, it is necessary to enable the buckle 4 to be disassembled separately. Specifically, in the technical solution of the present invention, the mounting portion 31 is provided with a locking structure for restricting the mounting portion 31 from detaching from the mounting seat 3.

[0050] The mounting portion 31 refers to the part of the buckle 4 that is connected to the mounting seat 3 of the inner guard plate 2, and specifically, it can be fixed by means of snap connection or fitting. Its function is to provide a stable mounting foundation for the buckle 4; the locking structure refers to a limiting mechanism provided between the mounting portion 31 and the mounting seat 3, and specifically, it can be realized by using a snap block or an elastic protrusion. Its function is to prevent the mounting portion 31 from detaching from the mounting seat 3 due to external forces through physical blocking; the mounting seat 3 refers to the connecting part on the inner guard plate 2 for carrying the mounting portion 31 of the buckle 4, and specifically, it can be realized by using a boss with a connecting groove or a guiding structure. Its function is to form a matching connection relationship with the mounting portion 31.

[0051] When the buckle 4 is inserted into the mounting seat 3 through the mounting portion 31, the locking structure generates mechanical interference through its own deformation or position change, so as to form a physical limit after the mounting portion 31 is completely embedded. For example, the clamping block returns to its original state after being pressed into the connecting groove during the installation process. At this time, the displacement of the mounting portion 31 in the axial direction is blocked by the locking structure, thereby avoiding loosening caused by vibration or assembly stress. Through the mechanical limiting effect of the locking structure, the tensile detachment resistance between the buckle 4 and the mounting seat 3 is significantly improved, and the risk of connection failure caused by the transmission of assembly stress is reduced.

[0052] Further, a connecting groove is formed on the mounting seat 3, and the locking structure includes a clamping block, and the clamping block is inserted into the connecting groove.

[0053] When the mounting portion 31 is mounted on the mounting seat 3, the clamping block is inserted into the connecting groove as the mounting portion 31 moves. Due to the interference fit between the geometric dimensions of the clamping block and the connecting groove, when an external force acts on the mounting portion 31, a frictional resistance will be generated at the contact surface between the clamping block and the connecting groove, and a self-locking effect will be formed through the geometric shape of the convex structure. This design enables the locking structure to directly offset part of the lateral tension through mechanical interference when the buckle 4 bears the assembly stress, avoiding the tendency of the mounting portion 31 to separate from the mounting seat 3, thereby reducing the transmission amplitude of the stress to the back door panel. Through the plug-in structure to form a three-dimensional space limit, under the action of the same assembly stress, the contact area between the clamping block and the connecting groove increases by about 40%, and its tensile resistance is significantly improved, while avoiding the problem of attenuation of the locking performance caused by material creep.

[0054] Furthermore, the clamping block is in the shape of an inverted hook or a wedge-shaped protrusion to limit the detachment of the buckle 4 from the mounting seat 3 when the clamping block rotates. When the buckle 4 rotates under the action of an external force, the bent part of the inverted hook-shaped structure will be embedded in the recess on the side wall of the connecting groove to form a spatial interference; the inclined surface of the wedge-shaped protrusion will have an extrusion contact with the edge of the connecting groove to form a frictional lock. Both structures prevent the buckle 4 from accidentally disengaging from the mounting seat 3 by restricting the movement freedom of the clamping block. Through the optimized design of the geometric shape, an additional locking force is generated during the rotation of the clamping block, effectively improving the connection stability between the buckle 4 and the mounting seat 3.

[0055] Refer to Figure 5 , Figure 5 which is a schematic flow chart of the first embodiment of the glue application method for the back door panel of the present invention

[0056] As Figure 5 shown, the glue application method for the back door panel proposed in the embodiment of the present invention includes the following steps:

[0057] Step S10: Divide the glue application area of the inner back door panel 1 into a high-elasticity area and a four-corner stress concentration support area.

[0058] It should be noted that the high-elasticity area refers to the area in the inner panel 1 of the back door that is greatly affected by assembly stress and requires elastic deformation compensation. Specifically, the range can be determined by simulating the stress distribution of the back door structure using finite element analysis software, and it is used to absorb the tensile deformation generated during the assembly of the inner guard plate 2 through a low-hardness adhesive layer. The high-elasticity area refers to the area in the inner panel 1 of the back door that is greatly affected by assembly stress and requires elastic deformation compensation. Specifically, the range can be determined by simulating the stress distribution of the back door structure using finite element analysis software, and it is used to absorb the tensile deformation generated during the assembly of the inner guard plate 2 through a low-hardness adhesive layer.

[0059] Step S20: Coat silicone rubber with Shore A hardness of 35 in the high-elasticity area.

[0060] It should be noted that silicone rubber with Shore A hardness of 35 refers to an organosilicon material with a hardness of 35 degrees of type A. Specifically, it can be realized by using a two-component reactive silicone rubber, and its elastic modulus adapts to the deformation requirements of the high-elasticity area.

[0061] Furthermore, the width of the silicone rubber with Shore A hardness of 35 is less than 8.5 mm and greater than 7.5 mm; the thickness of the silicone rubber with Shore A hardness of 35 is less than 1.3 mm and greater than 1.1 mm.

[0062] It is worth noting that the width of the silicone rubber with Shore A hardness of 35 refers to the linear coverage range formed by the glue application path on the surface of the inner panel 1 of the back door. Specifically, it can be realized by controlling the amount of colloid extrusion using a glue application device with an adjustable nozzle. By limiting the width range, the elastic deformation ability and bonding strength of the adhesive layer can be balanced. The thickness of the silicone rubber with Shore A hardness of 35 refers to the dimension of the adhesive layer perpendicular to the surface of the inner panel 1 of the back door. Specifically, it can be realized by using a laser distance sensor to monitor the stacking height of the colloid in real time and feedback to adjust the glue application speed. By limiting the thickness range, it can be ensured that the adhesive layer avoids stress concentration caused by being too thin or curing delay caused by being too thick when absorbing the assembly stress of the inner guard plate 2.

[0063] Specifically, when the glue application robot performs coating in the high-elasticity area according to a preset program, the width of the colloid is controlled within the range of 7.5 mm to 8.5 mm, so that the adhesive layer has enough extension space in the transverse direction to disperse the assembly stress transmitted by the inner guard plate 2. The thickness of the colloid is limited within the range of 1.1 mm to 1.3 mm, ensuring that the adhesive layer can buffer stress through elastic deformation in the vertical direction and maintain sufficient structural strength to prevent the colloid from breaking. This parameter combination enables the silicone rubber with Shore A hardness of 35 to form a uniform bonding layer with predetermined mechanical properties in the high-elasticity area, and absorb the tensile or shear stress generated during the assembly of the inner guard plate 2 through elastic deformation, thereby blocking the stress from being transmitted to the back door panel.

[0064] Step S30: Coat epoxy adhesive with Shore D hardness of 60 in the support area.

[0065] It should be noted that the Shore D60 epoxy adhesive refers to an epoxy resin material with a hardness of type D 60 degrees. Specifically, an epoxy adhesive prepared with a modified amine curing agent can be used, and its rigid modulus adapts to the load-bearing requirements of the support area.

[0066] Specifically, before applying the adhesive, the boundary between the high-elasticity area and the four-corner support area of the inner panel 1 of the back door is determined through numerical simulation and physical testing, and a sub-region adhesive application strategy is adopted. A low-hardness silicone adhesive is applied to the high-elasticity area, and its elastic deformation ability is used to absorb the assembly stress transmitted during the clamping of the inner lining 2, avoiding the spread of stress to the back door panel; a high-hardness epoxy adhesive is applied to the four-corner support area, and anti-deformation support points are formed at the four corners of the back door through its rigid characteristics, suppressing the cracking of the adhesive layer caused by stress concentration. The gradient distribution of the elastic modulus of the two adhesive layers realizes the dual functions of stress buffering and structural support. By selecting adhesives with differences in different regions, the stress transmission path is optimized while ensuring the sealing performance.

[0067] Furthermore, the width of the Shore D60 epoxy adhesive is less than 15.5 mm and greater than 14.5 mm; the thickness of the Shore D60 epoxy adhesive is less than 0.9 mm and greater than 0.7 mm.

[0068] It is worth noting that in the stress concentration areas at the four corners of the inner panel 1 of the back door, a continuous adhesive strip is formed using the Shore D60 epoxy adhesive. The width of the adhesive strip can be between 14.5 mm and 15.5 mm, and the thickness can be between 0.7 mm and 0.9 mm. By precisely controlling the size of the adhesive strip, the cured colloid can not only provide sufficient structural support to offset the assembly stress but also avoid abnormal fitting gaps between the inner and outer panels caused by too thick an adhesive layer. During the coating process, the adhesive strip continuously extends along the boundary of the support area, covering the bending points of the stamping structure or the welding points, and dispersing the tensile stress generated during the assembly of the inner lining 2 through the rigidity of the colloid itself. In some specific embodiments, multi-stage variable-speed coating can be used for applying the adhesive in the support area. For example, the moving speed of the robot is reduced in the corner area to increase the accumulation of adhesive, and the moving speed is increased in the straight area to maintain the uniformity of the adhesive strip; after the colloid is cured, the surface can be locally flattened to eliminate air bubbles.

[0069] Step S40: Use a two-barrel adhesive application robot to perform coating, and switch the type of adhesive material through program control;

[0070] The switching time is less than or equal to 5 seconds.

[0071] It should be noted that the dual-barrel glue application robot refers to an automated glue application device equipped with two independent glue containers, which can be specifically implemented by integrating a dual storage tank with a robotic arm. The two barrels respectively contain glues of different properties, such as silicone glue and epoxy glue, and the selection of glue types is achieved through a switching mechanism. Program-controlled switching of glue types means automatically adjusting the glue outlet and the feeding path through preset logical instructions, which can be specifically implemented by the collaborative work of a programmable logic controller and a solenoid valve, and the glue output is switched in real time according to the division of the glue application area. The switching time being less than or equal to five seconds refers to the interval duration from the stop of the output of one glue to the start of the output of another glue, which can be specifically achieved by optimizing the layout of the feeding pipeline, reducing glue residue, and improving the response speed of the valve.

[0072] Specifically, during the glue application process of the inner panel 1 of the rear door, the dual-barrel glue application robot automatically switches the corresponding glue types through program control according to the division of the glue application area, such as the high-elasticity area and the support area. When it is necessary to apply silicone glue in the high-elasticity area, the robot drives the glue output of the first barrel; when it is necessary to switch to applying epoxy glue in the support area, the program triggers the solenoid valve to close the first barrel and open the second barrel, and at the same time adjusts the moving path of the robotic arm to the target area. During the switching process, the glue switching action is completed within five seconds, avoiding glue application interruption or quality defects caused by glue curing or mixing. Through the dual-barrel design combined with program control, the rapid switching of the two glues is realized without shutdown operation, which not only ensures the continuity of glue application but also reduces the errors caused by manual intervention.

[0073] It should be understood that the above is only for illustrative purposes and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can set it according to needs, and the present invention does not make any restrictions on this.

[0074] It should be noted that the above-described work process is only illustrative and does not constitute a limitation to the protection scope of the present invention. In actual applications, those skilled in the art can select some or all of them according to actual needs to achieve the purpose of the solution of this embodiment, and no restrictions are made here.

[0075] In addition, for the technical details not described in detail in this embodiment, reference can be made to the skylight installation method provided in any embodiment of the present invention, which will not be elaborated here.

[0076] In addition, it should be noted that in this text, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent in such a process, method, article or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or system including that element.

[0077] The serial numbers of the above embodiments of the present invention are only for description and do not represent the superiority or inferiority of the embodiments.

[0078] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that makes a contribution to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as Read Only Memory (ROM) / RAM, magnetic disk, optical disc), and includes several instructions to enable a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0079] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A clamping structure for a rear door panel, applied to an automobile, characterized in that Comprising: Inner panel; Inner guard plate, installed on the inner panel and provided with a plurality of mounting seats; A plurality of buckles, clamped inside the inner panel for fixing the inner guard plate. The buckle includes a mounting portion and a fixing portion. The mounting portion is arranged on the mounting seat, and the fixing portion is arranged on the mounting portion and extends towards the inner panel in a wavy shape for absorbing tensile force.

2. The snap connection structure of the back door panel according to claim 1, wherein, The wave crests and wave troughs of the fixing portion are alternately distributed, and the number of wave crests is greater than or equal to three.

3. The snap connection structure of the back door panel according to claim 1, characterized in that, The material of the fixing portion is silicone or thermoplastic polyurethane elastomer.

4. The clamping structure of the back door panel according to claim 1, characterized in that The mounting portion is provided with a locking structure for restricting the mounting portion from disengaging from the mounting seat.

5. The snap connection structure of the back door panel according to claim 4, characterized in that, A connecting groove is formed on the mounting seat, and the locking structure includes a clamping block which is inserted into the connecting groove.

6. The snap connection structure of the back door panel according to claim 5, characterized in that, The clamping block is in the shape of an inverted hook or a wedge-shaped protrusion to restrict the buckle from disengaging from the mounting seat when the clamping block rotates.

7. A method for applying glue to a back door panel, characterized in that, Including steps: Dividing the glue coating area of the back door inner panel into a high-elasticity area and a four-corner stress concentration support area; Coating silicone rubber of Shore A35 in the high-elasticity area; Coating epoxy glue of Shore D60 in the support area.

8. The method for applying glue to the back door panel according to claim 7, characterized in that, The coating of silicone rubber of Shore A35 in the high-elasticity area includes: The width of the silicone rubber of Shore A35 is less than 8.5 mm and greater than 7.5 mm; The thickness of the silicone rubber of Shore A35 is less than 1.3 mm and greater than 1.1 mm.

9. A method for applying glue to a back door panel, characterized in that, The coating of epoxy glue of Shore D60 in the support area includes: The width of the epoxy glue of Shore D60 is less than 15.5 mm and greater than 14.5 mm; The thickness of the epoxy glue of Shore D60 is less than 0.9 mm and greater than 0.7 mm.

10. The glue coating method for the back door panel according to claim 9, characterized in that: A dual-barrel glue coating robot is used to perform the coating, and the type of glue is switched through program control; The switching time is less than or equal to 5 seconds.

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