A lower auxiliary tool for assembling a fender of an automobile

Abstract

The utility model provides a kind of lower auxiliary tool for automobile fender assembly, including tool body, fender support block, compression pull hook, adsorption magnetic block and fender positioning mechanism. Tool body is the plate structure of inverted T shape as a whole, the inside wall of its right end end part is provided with fender support block, the right upper corner of top is provided with fender positioning mechanism, and the lower end and right end position of middle part are respectively provided with adsorption magnetic block;Compression pull hook can be rotatably stretched and vertically installed in the bottom end position of tool body middle part, and the inner end end part is vertically provided with the compression plate matched with the adsorption magnetic block above it, to be compressed on adsorption magnetic block by compression plate after rotating, the lower part of fender. The utility model is realized by the tool body of inverted T type combining multistage positioning, adsorption magnetic block and compression pull hook structure, the quick positioning and reliable fixing of fender lower part, with the advantages of quick and accurate positioning, flexible adaptation ability is strong and easy to operate.

Description

Technical Field

[0001] This utility model relates to the field of automotive assembly technology, and in particular to a lower auxiliary tooling for assembling automotive fenders. Background Technology

[0002] In automobile manufacturing, fender assembly has always been a major technical challenge for OEMs. Due to the complex positioning structure and thin, easily deformable sheet metal of the fender, coupled with its crucial role in the vehicle's exterior appearance, extremely high assembly precision is required. Traditional assembly processes suffer from the following technical shortcomings: First, existing tooling lacks effective rapid positioning and self-inspection functions, leading to repeated adjustments and high rework rates during assembly. Second, the assembly process relies excessively on manual operation, resulting in low efficiency and increased labor costs. Third, in the lower fender assembly stage, existing technology struggles to achieve precise positioning and reliable fixing, making it difficult to guarantee the gap and surface difference between the fender and the hood, severely impacting the overall vehicle appearance quality.

[0003] Although some positioning devices are used in existing technologies, problems such as inaccurate positioning and insecure fixing still exist in the actual assembly process, requiring a lot of manual intervention for adjustment, which increases assembly time costs and makes it difficult to guarantee the consistency of assembly quality. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a lower auxiliary tooling for assembling automobile fenders, which can quickly position and assemble multiple models and has a self-inspection function, thereby improving production efficiency and quality and saving time and costs.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution:

[0006] A lower auxiliary tooling for assembling automobile fenders includes a tooling body, a fender support block, a clamping hook, an adsorption magnet, and a fender positioning mechanism, wherein:

[0007] The tooling body is an inverted T-shaped plate structure. The inner wall of its right end is provided with the fender support block, the upper right corner of the top is provided with the fender positioning mechanism, and the lower and right ends of its middle part are respectively provided with the adsorption magnetic blocks.

[0008] The clamping hook is rotatable and can be vertically installed at the bottom of the middle part of the tooling body. Its inner end is vertically provided with a clamping plate that cooperates with the adsorption magnetic block above it, so that after rotation, the lower part of the fender is pressed against the adsorption magnetic block by the clamping plate.

[0009] Preferably, the tooling body includes a tooling upright plate and a tie rod mounting block disposed at the bottom center of the tooling upright plate, wherein:

[0010] The tooling upright plate is a vertically arranged inverted T-shaped plate structure. The fender support block and the adsorption magnetic block are detachably installed on its inner sidewalls by bolts through several spaced rubber buffer pads.

[0011] The pull rod mounting block has a semi-circular structure and is integrally formed with the tooling upright plate, and a mounting hole for installing the clamping hook is opened at its center.

[0012] More preferably, the height of the left end of the tooling upright plate is 1.2-1.5 times the height of its right end, and the width of the left end is 1 / 3-2 / 3 times the width of its right end;

[0013] Furthermore, a square observation hole is provided at the protruding position in the middle of the tooling upright plate, and a support connection part with an upward protrusion at the right end is integrally provided for corresponding installation of the fender support block.

[0014] Preferably, the fender support block includes a support body and a buffer pad, wherein:

[0015] The support body is a block structure with an inverted L-shaped cross-section. Its back is detachably installed on the corresponding support connection part by bolts through several rubber buffer pads, and the buffer pad is provided on the end face of its top protruding inward.

[0016] Preferably, the clamping hook includes a limiting bushing and a pull rod body, wherein:

[0017] The limiting bushing is coaxially embedded in the mounting hole of the tie rod mounting block at the bottom of the middle part of the tooling body. An L-shaped limiting hole is opened on the outer periphery of its inner end, and the outer end is fixed to the outer wall of the tie rod mounting block by bolts through an integrally set cover plate.

[0018] The pull rod body is movably inserted into the limiting bushing. A limiting post that can be movably embedded in the L-shaped limiting hole is provided on the circumference of its right end. A pressing plate is vertically provided at the right end, and a rotating handle is vertically provided at the left end.

[0019] More preferably, the clamping hook further includes a compression spring compressed and sleeved on the left end of the pull rod body, wherein:

[0020] One end of the compression spring is connected to the limiting ring at the left end of the pull rod body, and the other end is connected to the cover plate, so as to always apply an outward thrust to the pull rod body, thereby synchronously driving the pressing plate to press the lower part of the fender.

[0021] Preferably, the two sets of adsorption magnetic blocks are respectively a first adsorption magnetic block disposed at the lower middle part of the tooling body and a second adsorption magnetic block disposed at the right end of the tooling body near the fender support block, wherein:

[0022] The first magnetic adsorption block is composed of a first mounting block and several first magnets embedded on the outer wall of the first mounting block. The back of the first mounting block is detachably mounted on the tooling body by bolts through several rubber buffer pads.

[0023] The second magnetic adsorption block consists of a second mounting block and several second magnets embedded on the outer wall of the second mounting block. The back of the second mounting block is detachably mounted on the tooling body by bolts through several rubber buffer pads.

[0024] Preferably, the fender positioning mechanism includes a T-shaped mounting base, a fender positioning pin, a first L-shaped connecting plate, and a contour support block, wherein:

[0025] The T-shaped mounting base has a T-shaped structure, with the fender positioning pin vertically arranged at the top center. The inner end of the fender positioning pin is set with a pointed structure, which can be limited and connected with the corresponding positioning hole on the lower outer wall of the fender.

[0026] The first L-shaped connecting plate has an L-shaped structure. Its vertical section sidewall is detachably bolted to the lower vertical section of the T-shaped mounting base via several rubber buffer pads. Its horizontal end is detachably bolted to the outer sidewall of the top of the tooling body.

[0027] The contour support blocks are two sets of different thicknesses, which are respectively installed on the front sidewalls of the left and right ends of the T-shaped mounting base, and their front sidewalls are set as contour slopes that can fit against the lower part of the fender.

[0028] Preferably, the lower auxiliary tooling further includes a fender limiting mechanism disposed on the left side end of the tooling body, the fender limiting mechanism including a first limiting mechanism and a second limiting mechanism, wherein:

[0029] The first limiting mechanism consists of a Z-shaped mounting base and a first limiting pin fixedly disposed on the top of the Z-shaped mounting base, and the back of the Z-shaped mounting base is detachably mounted on the tooling body by bolts through several rubber buffer pads;

[0030] The second limiting mechanism consists of a vertically arranged strip mounting base and a second limiting pin fixedly disposed on the top of the strip mounting base, and the strip mounting base is directly and detachably mounted on the tooling body by bolts.

[0031] More preferably, the fender limiting mechanism further includes a third limiting mechanism, which includes a zigzag limiting seat, a third limiting pin, a limiting block, an L-shaped connecting block, and a fixing block, wherein:

[0032] The zigzag limiting seat is arranged in a vertical zigzag shape. The third limiting pin is vertically set at the top, and the limiting block is fixedly set on the front side wall of the top. The limiting block is located below the front end of the third limiting pin.

[0033] The L-shaped connecting block has an inverted L-shaped structure. The sidewall of its vertical section is detachably connected to the lower sidewall of the zigzag limiting seat via bolts using several rubber buffer pads. The bottom of its horizontal section is detachably mounted to the top of the fixing block via bolts using several rubber buffer pads.

[0034] The fixing block is a rectangular block structure, which is detachably installed at the lower right end of the tooling body by bolts through several rubber buffer pads.

[0035] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0036] This utility model provides a lower auxiliary tooling for assembling automobile fenders, mainly comprising a tooling body, a fender support block, a clamping hook, an adsorption magnetic block, and a fender positioning mechanism. Through the inverted T-shaped tooling body combined with multi-stage positioning, adsorption magnetic blocks, and a clamping hook structure, it achieves rapid positioning and reliable fixing of the lower part of the fender. It has the advantages of rapid and accurate positioning, strong flexible adaptability, and simple operation. This lower auxiliary tooling is simple and convenient to operate, with a flexible structural design, capable of adapting to flexible production of multiple vehicle models, thereby improving production efficiency and quality, and saving time and costs. Attached Figure Description

[0037] Figure 1 This is a three-dimensional structural diagram of a lower auxiliary tooling for assembling automobile fenders according to the present invention. Figure 1 ;

[0038] Figure 2 This is a three-dimensional structural diagram of a lower auxiliary tooling for assembling automobile fenders according to the present invention. Figure 2 ;

[0039] Figure 3 This utility model Figure 2 The diagram shows a partially enlarged structural schematic of part A in a lower auxiliary tooling used for assembling automobile fenders.

[0040] Figure 4 This is a top view schematic diagram of the lower auxiliary tooling for assembling automobile fenders according to the present invention.

[0041] Figure 5 This is a front view schematic diagram of the lower auxiliary tooling for assembling automobile fenders according to the present invention.

[0042] Figure 6 This is a schematic diagram of the back structure of a lower auxiliary tooling for assembling automobile fenders according to the present invention.

[0043] Figure 7 This is a right-side structural schematic diagram of a lower auxiliary tooling for assembling automobile fenders according to the present invention.

[0044] Figure 8 This is a left-side view of the lower auxiliary tooling for assembling automobile fenders according to the present invention.

[0045] Figure 9 This is a bottom view of the lower auxiliary tooling for assembling automobile fenders according to the present invention.

[0046] The accompanying figures are labeled as follows:

[0047] 100-Tooling body, 101-Tooling upright plate, 102-Tie rod mounting block, 103-Square observation hole, 104-Support connection part;

[0048] 200-Fender support block, 201-Support body, 202-Buffer pad;

[0049] 300-Clamping hook, 310-Limiting bushing, 311-L-shaped limiting hole, 312-Cover plate, 320-Pull rod body, 321-Limiting post, 322-Clamping plate, 323-Handle; 330-Compression spring;

[0050] 400 - Adsorption magnetic block, 410 - First adsorption magnetic block, 411 - First mounting block, 412 - First magnet, 420 - First adsorption magnetic block, 421 - Second mounting block, 422 - Second magnet;

[0051] 500-Fender positioning mechanism, 501-T-type mounting base, 502-Fender positioning pin, 503-First L-shaped connecting plate, 504-Contour support block;

[0052] 600-Fender limiting mechanism, 610-First limiting mechanism, 611-Z-type mounting base, 612-First limiting pin, 620-Second limiting mechanism, 621-Strip mounting base, 622-Second limiting pin, 630-Third limiting mechanism, 631-Zigzag limiting seat, 632-Third limiting pin, 633-Limiting block, 634-L-type connecting block, 635-Fixing block. Detailed Implementation

[0053] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0054] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0055] In existing technologies, the assembly process of automotive fenders suffers from insufficient positioning accuracy, high reliance on manual operation, and poor tooling adaptability. Traditional tooling often uses rigid clamps to fix the fenders, which easily leads to deformation of thin sheet metal and lacks flexible adjustment capabilities. The assembly process requires repeated adjustments to the clamp positions, resulting in low operational efficiency and difficulty in adapting to the production needs of multiple vehicle models. For example, when assembling a fender for a certain vehicle model, operators need to manually adjust the gap between the locating pin and the sheet metal, leading to extended assembly cycles. Furthermore, switching between different vehicle models requires replacing the entire set of tooling equipment.

[0056] To address the aforementioned issues, the inventors discovered that existing tooling lacks adaptability to the deformation characteristics of fenders and employs a single fixing method. Analysis revealed that a combined fixing method of magnetic attraction and mechanical clamping can reduce stress-induced deformation of the sheet metal, while a modular positioning structure can improve the tooling's flexibility. Based on this, they proposed using an inverted T-shaped body as the basic support structure, combining magnetic positioning and a rotary clamping mechanism to achieve damage-free fender fixing. Furthermore, the detachable modular design meets the profile requirements of different vehicle models.

[0057] In some of these embodiments, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, this application proposes a lower auxiliary tooling for assembling an automobile fender, comprising a tooling body 100, a fender support block 200, a clamping hook 300, an adsorption magnet 400, and a fender positioning mechanism 500. The tooling body 100 has an inverted T-shaped plate structure. The fender support block 200 is located on the inner wall of the right end, the fender positioning mechanism 500 is located at the upper right corner, and the adsorption magnet 400 is located at the lower middle and right ends, respectively. The clamping hook 300 is vertically installed at the lower middle end of the tooling body 100, and its inner end is provided with a clamping plate 322 that cooperates with the adsorption magnet 400, clamping the lower part of the fender through rotation.

[0058] The tooling body 100 refers to the basic structure that supports each functional module. Its inverted T-shaped design enhances structural stability. The inner wall of its right end is used to install the fender support block 200 to form a lateral limit. The fender support block 200 is a limiting component used to abut against the fender sidewall. Specifically, it can be installed using bolts and rubber buffer pads to absorb assembly impact during positioning. The clamping hook 300 is the actuator for mechanical clamping. It drives the clamping plate 322 through a rotational pulling action. Specifically, it can adopt a pull rod structure with a limiting post. After rotation, the clamping plate 322 and the magnetic adsorption block 400 form a clamping space.

[0059] The magnetic adsorption block 400 refers to the fixing device that uses magnetic force to attract the fender. It is arranged in two groups, one in the middle and one on the right. Specifically, it can be a mounting block with embedded permanent magnets, and a rubber buffer pad can be used to reduce the impact of magnetic attraction. The fender positioning mechanism 500 refers to the component that achieves precise positioning, including a positioning pin and a contoured support block. Specifically, it can use a sharp-angled positioning pin and a contoured inclined surface to ensure the accurate spatial position of the fender.

[0060] Specifically, during assembly, the fender positioning pin 502 is first inserted into the panel positioning hole, and the magnetic adsorption block 400 adheres to the panel surface for initial fixation. The clamping hook 300 is then rotated to the working position, causing the clamping plate 322 to abut against the edge of the fender, forming a double fixation with the magnetic adsorption block 400. The fender support block 200 limits the end of the fender to prevent panel displacement, and the contoured support block on the fender positioning mechanism 500 conforms to the panel contour to maintain the assembly angle. The inverted T-shaped tooling body 100 provides a stable support base, and the detachable design of each module allows for quick replacement to adapt to different vehicle models.

[0061] Compared to existing technologies, current tooling often relies on purely mechanical clamping, leading to sheet metal deformation, and its fixed positioning structure cannot adapt to various vehicle models. This solution utilizes the synergistic effect of the magnetic adsorption block 400 and the clamping hook 300 to reduce contact pressure while maintaining fixing force. The modular design of the fender support block 200 and the clamping hook 300 allows for flexible production through quick replacement, while the inverted T-shaped tooling body 100 enhances tooling rigidity and prevents vibration and displacement during assembly.

[0062] Through the above technical solution, this application solves the problem of low positioning accuracy in fender assembly, achieving damage-free clamping through a composite fixing method of magnetic attraction and mechanical clamping. The detachable modular design improves tooling adaptability and reduces adjustment time during vehicle model changes. The combination of the fender positioning pin 502 and the contour support block 503 ensures accurate spatial positioning of the panels, reducing the need for manual intervention. The overall structure simplifies the assembly process, improving production efficiency and product quality consistency.

[0063] In some of these embodiments, such as Figure 2 and Figure 3As shown, this application further proposes that the tooling body 100 includes a tooling upright plate 101 and a tie rod mounting block 102 disposed at the bottom of the middle part of the tooling upright plate 101. The tooling upright plate 101 is a vertically arranged inverted T-shaped plate structure. The fender support block 200 and the magnetic adsorption block 400 are detachably installed on its inner sidewalls by bolts through several spaced rubber buffer pads. The tie rod mounting block 102 is a semi-circular structure, integrally formed with the tooling upright plate 101, and has a mounting hole for installing the clamping hook 300 at its center.

[0064] The inverted T-shaped plate structure refers to the tooling upright plate 101 having a cross-sectional shape that is wider at the bottom and narrower at the top in the vertical direction, which can be achieved by stamping steel plates. The rubber buffer pads are rubber gaskets with elastic deformation capabilities, such as those made of nitrile rubber, which are spaced apart between the inner wall of the tooling upright plate 101 and the fender support block 200 and the magnetic adsorption block 400 to absorb vibration and impact generated during assembly. The semi-circular structure refers to the tie rod mounting block 102 having an outer contour of 180 degrees, with a mounting hole at its center machined using CNC drilling to install the clamping hook 300.

[0065] Specifically, the height of the left end of the tooling upright plate 101 is 1.2-1.5 times the height of its right end, and the width of the left end is 1 / 3-2 / 3 times the width of its right end. A square observation hole 103 is provided at the protruding position in the middle of the tooling upright plate 101, and a support connection part 104 with an upward protrusion at the top is integrally provided at the right end for corresponding installation of the fender support block 200. The square observation hole 103 refers to a rectangular through hole provided in the protruding area in the middle of the tooling upright plate 101, which allows the operator to directly observe the contact state between the fender and the tooling. The support connection part 104 refers to a protruding mounting platform integrally formed with the right end of the tooling upright plate 101. Specifically, it can be implemented by adopting a stepped structure with the top 3mm higher than the plane of the tooling upright plate, providing a stable mounting reference surface for the fender support block 200.

[0066] In some of these embodiments, such as Figure 1 , Figure 2 and Figure 6 As shown, this application further proposes a fender support block 200 including a support body 201 and a buffer pad 202. The support body 201 is a block structure with an inverted L-shaped cross-section. Its back is detachably mounted on the corresponding support connection part 104 by bolts through several rubber buffer pads, and the buffer pad 102 is provided on the end face of its top protruding inward.

[0067] The support body 201 refers to a block-shaped component with an inverted L-shaped cross-section, which can be made of aluminum alloy or engineering plastic. The inverted L-shaped structure forms a combination of vertical and horizontal sections. The vertical section is used to connect to the support connection part 104, and the horizontal section extends outward to form a load-bearing platform. The buffer pad 102 refers to an elastic material layer set on the outer end face of the protrusion at the top of the support body 101, which can be made of polyurethane or silicone. It is fixed by adhesive or snap-fit ​​and is used to absorb the impact load during assembly contact. The rubber buffer pad refers to an elastic element installed between the back of the support body 201 and the support connection part. It can be molded from nitrile rubber or neoprene rubber and is detachably fixed by bolt pre-tightening force. It is used to isolate the transmission of rigid vibration.

[0068] Specifically, the support body 201 forms a cantilever support frame through an inverted L-shaped structure. Its vertical section is flexibly connected to the support connection 104 via a rubber buffer pad, and the horizontal section extends outward to form a load-bearing surface. When the fender is assembled, the buffer pad 102 at the top protrusion of the support body 201 first contacts the workpiece surface, absorbing the initial contact impact through the elastic deformation of the material. The rubber buffer pad undergoes compression deformation during installation, further attenuating the vibration energy generated by the assembly operation. The support body 201 adopts a detachable bolt connection method, allowing adjustment of the installation position or replacement of the fender support block 200 of appropriate size according to different vehicle models. The length of the horizontal section of the inverted L-shaped structure can be designed in various specifications to adapt to the support requirements of fenders of different thicknesses.

[0069] Through the above technical solution, this application effectively reduces the rigid impact between the fender support block 200 and the fender during the assembly process, preventing damage to the surface of thin plates; the inverted L-shaped support body 201 structure can adapt to the installation requirements of workpieces of different thicknesses, and the detachable design of the rubber buffer pad 102 allows the support block to be quickly adjusted in terms of installation quantity or changed in terms of specifications according to changes in vehicle models, thereby improving the versatility and maintenance convenience of the tooling system.

[0070] In some of these embodiments, such as Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 8As shown, this application further proposes a clamping hook 300 including a limiting bushing 310 and a pull rod body 320. The limiting bushing 310 is coaxially embedded in the mounting hole of the pull rod mounting block 102 at the bottom of the middle part of the tooling body 100. An L-shaped limiting hole 311 is opened on the outer periphery of its inner end, and the outer end is fixed to the outer wall of the pull rod mounting block 102 by bolts through an integrally set cover plate 312. The pull rod body 320 is movably inserted into the limiting bushing 310. A limiting post 321 that can be movably embedded in the L-shaped limiting hole 311 is provided on the periphery of its right end. A clamping plate 322 is vertically arranged at the right end, and a rotating handle 323 is vertically arranged at the left end.

[0071] The limiting bushing 310 is an annular sleeve with an axial through hole and an L-shaped limiting hole 311, which can be machined from medium carbon steel and is used to constrain the movement trajectory of the tie rod body 320. The L-shaped limiting hole 311 is a channel composed of an axial extension section and a transverse limiting section, which can be formed by milling and is used to guide the movement path of the limiting post 321 during rotational stretching. The limiting post 321 is a cylindrical protrusion fixed to the circumference of the tie rod body 320 and is used to cooperate with the L-shaped limiting hole 311 to achieve movement limitation. The clamping plate 322 is a metal pressure block perpendicular to the end of the tie rod body 320, which can be made of stamped steel plate welded with bolts and is used to directly contact and clamp the fender.

[0072] Specifically, when the handle 323 is manually pressed, the pull rod body 320 drives the limiting post 321 to move inward along the axial extension of the L-shaped limiting hole 311, achieving axial tension. When the control handle 323 rotates to a set angle along the transverse section of the L-shaped limiting hole 311, the clamping plate 322 at one end of the pull rod body 320 rotates from top to bottom, causing the clamping plate 322 to disengage from the fender. Similarly, by rotating the pull rod body 320 counterclockwise through the handle 323, the clamping plate 322 is simultaneously rotated to the inner side of the upper fender under the limitation of the transverse section of the limiting hole 311, thereby limiting the fender.

[0073] Through the above technical solution, this application achieves one-handed operation of the clamping hook 300, allowing for precise positioning and continuous locking of the clamping plate simply by rotating the handle. The cooperation between the limiting post 321 and the L-shaped limiting hole 311 eliminates possible displacement deviations during the clamping process, ensuring that the clamping plate remains perpendicular to the fender surface. This structure effectively solves the problem of fender deformation caused by uneven clamping force during manual operation, while also reducing the dependence of the assembly process on the operator's skill level.

[0074] Furthermore, as one preferred embodiment, such as Figure 9As shown, this application further proposes a clamping hook 300 including a compression spring 330 compressed and sleeved on the left end of the pull rod body 320. One end of the compression spring 330 is abutted and connected to the limiting ring at the left end of the pull rod body 320, and the other end is abutted and connected to the cover plate 312, so as to always apply an outward thrust to the pull rod body 311, thereby synchronously driving the clamping plate 322 to clamp the lower part of the fender.

[0075] The compression spring 330 is a helical spring that stores mechanical energy through elastic deformation. It can be made of high-carbon steel, and its elastic restoring force under compression can push the pull rod body 310 outward. The two ends of the compression spring 300 form mechanical contact with the limiting ring and the cover plate 312, respectively, maintaining a continuous thrust on the pull rod body 310 through compression preload. The limiting ring is an annular protrusion fixed to the left end of the pull rod body 320, used to limit the axial displacement of the compression spring 330 on the pull rod body 320 and to transmit the spring's thrust to the pull rod body 320.

[0076] Specifically, the compression spring 330 is compressed and sleeved on the left end of the pull rod body 320, with its two ends abutting against the limiting ring and the cover plate 312, respectively. When the operator presses inward and rotates the pull rod body 320, the pull rod drives the limiting post 321 to move along the L-shaped limiting hole 311 of the limiting bushing 310, and locks it in the transverse section of the L-shaped limiting hole 311 after rotating to a certain angle. The pressing plate 322 flips to the bottom, at which point the compression spring 330 is further compressed to store elastic potential energy. After the fender is installed on this fixture, the pull rod body 320 is manually controlled to rotate counterclockwise along the transverse section of the L-shaped limiting hole 311 to the axial section position. The elastic restoring force of the compression spring 330 applies an outward thrust to the pull rod body 320 through the limiting ring, forcing the pressing plate 320 to press against the lower part of the fender. This thrust is always present during the assembly process, and a stable pressing state can be maintained even under vibration or impact loads. Meanwhile, the spring's flexibility can absorb instantaneous impacts during assembly, preventing fender deformation caused by rigid clamping.

[0077] Through the above technical solution, this application solves the problem of unstable fender clamping caused by the failure of the clamping hook 300 to automatically reset after rotation and stretching. The continuous thrust of the compression spring 330 ensures that the clamping plate 322 is always in close contact with the fender, eliminating clamping failure caused by human operation errors or vibration. The elastic characteristics of the compression spring 330 further reduce the impact of assembly impact on the workpiece, improve the tooling's ability to protect the surface quality of the fender, and reduce rework rate.

[0078] In some of these embodiments, such as Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, this application further proposes two sets of magnetic adsorption blocks 400, namely a first magnetic adsorption block 410 disposed at the lower middle part of the tooling body 100 and a second magnetic adsorption block 420 disposed at the right end of the tooling body 100 near the fender support block 200. The first magnetic adsorption block 410 consists of a first mounting block 411 and several first magnets 412 embedded in the outer wall of the first mounting block 411. The back of the first mounting block 411 is detachably mounted on the tooling body 100 by bolts through several rubber buffer pads. The second magnetic adsorption block 420 consists of a second mounting block 421 and several second magnets 422 embedded in the outer wall of the second mounting block 421. The back of the second mounting block 421 is detachably mounted on the tooling body 100 by bolts through several rubber buffer pads.

[0079] The first magnetic adsorption block 410 refers to a magnetic adsorption assembly located at the lower middle part of the tooling body 100. Specifically, it can be implemented using a first mounting block 411 with multiple first magnets 412. The first magnets 412 are embedded in an array on the outer wall of the first mounting block 411 to enhance the adsorption force on the middle part of the fender. Similarly, the second magnetic adsorption block 420 refers to a magnetic adsorption assembly located at the right end of the tooling body 100 near the fender support block 200. Specifically, it can be implemented using a second mounting block 421 with multiple second magnets 422. The second magnets 422 are embedded in the outer wall of the second mounting block 421 to adapt to the curved surface structure of the fender edge area. The rubber buffer pad refers to an elastic connector between each mounting block and the tooling body 100. Specifically, it can be implemented using vulcanized rubber gaskets to absorb vibrations during assembly and prevent rigid contact between the magnets and the fender.

[0080] Specifically, the first magnetic adsorption block 410 and the second magnetic adsorption block 420 form a complementary layout on the tooling body 100. The first magnetic adsorption block 410 covers the overhanging area in the middle of the fender, and the second magnetic adsorption block is attached to the bending area adjacent to the fender support block 200 on the right end of the fender. The first mounting block 411 and the second mounting block 421 are connected by bolts to achieve independent assembly and disassembly. When it is necessary to adapt to different models of fenders, the distribution of adsorption force can be changed by replacing the mounting blocks or adjusting the number of magnets. The design of the magnets being embedded in the outer wall of the mounting blocks ensures that the adsorption surface maintains parallel contact with the fender, avoiding adsorption failure due to local warping. Rubber buffer pads form flexible support between each mounting block and the tooling body 100.

[0081] Through the above technical solution, this application can quickly adjust the position and magnetic force distribution of the adsorption magnetic blocks according to the shape characteristics of different fender models, avoiding the need for tooling switching due to insufficient adaptability of a single adsorption structure. The complementary layout of the first adsorption magnetic block 410 and the second adsorption magnetic block 420 can simultaneously stabilize the central and edge areas of the fender, reducing manual adjustment operations during assembly. The detachable connection between the mounting block and the tooling body 100 makes magnet maintenance or replacement more convenient, reducing tooling modification costs.

[0082] In some of these embodiments, such as Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 8 As shown, this application further proposes a fender positioning mechanism 500 including a T-shaped mounting base 501, a fender positioning 502, a first L-shaped connecting plate 503, and a contoured support block 504. The T-shaped mounting base 501 has a T-shaped structure, with a fender positioning pin 502 vertically arranged at the center of its top. The inner end of the fender positioning pin 502 is set with a pointed structure, which can be limited and connected to the corresponding positioning hole on the lower outer wall of the fender. The first L-shaped connecting plate 503 has an L-shaped structure. Its vertical section sidewall is detachably mounted on the lower vertical section of the T-shaped mounting base 501 by bolts through several rubber buffer pads, and its horizontal end is detachably mounted on the upper outer wall of the tooling body 100 by bolts. The contoured support block 504 consists of two sets with different thicknesses, which are respectively installed on the front sidewalls of the left and right ends of the T-shaped mounting base 501, and its front sidewall is set as a contoured inclined surface that can fit against the lower part of the fender.

[0083] The T-shaped mounting base 501 refers to a load-bearing base with a T-shaped structure. The middle section of its transverse segment is used to install the fender positioning pin 502, while the lower longitudinal segment connects to the first L-shaped connecting plate 503. This T-shaped layout achieves a balance between structural rigidity and installation space. The pointed structure of the fender positioning pin 502 refers to a positioning component with an acute-angled end. The first L-shaped connecting plate 503 is an L-shaped transition connector composed of a vertical segment and a transverse segment. A rubber buffer pad is placed between its vertical segment and the T-shaped mounting base 502 to absorb vibration and impact generated during assembly. The contoured inclined surface of the contoured support block 504 refers to an inclined surface that matches the lower contour of the fender. It can be CNC machined and installed using a combination of two sets of support blocks of different thicknesses to compensate for differences in the shape of different fender models.

[0084] Specifically, the T-shaped mounting base 501 serves as the core mounting platform and is bolted to the tooling body 100 via the first L-shaped connecting plate 503. When the pointed end of the fender positioning pin 502 is inserted into the fender positioning hole, initial positioning is achieved using geometric constraints. The first L-shaped connecting plate 503, connected by detachable bolts, allows adjustment of the lateral mounting position of the T-shaped mounting base 501 according to vehicle model requirements. The rubber buffer pad absorbs operational impact during assembly, preventing component deformation caused by rigid connections. Two sets of contoured support blocks 504 are installed on the left and right sides of the T-shaped mounting base 501, respectively. Their contoured inclined surfaces form surface contact with the lower contour of the fender. The thickness variation configuration can cover the curvature changes of different fender models, ensuring that the support surface fits tightly against the fender.

[0085] In some of these embodiments, such as Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, this application further proposes a lower auxiliary tooling for assembling automobile fenders, including a tooling body 100 and a fender limiting mechanism 600 disposed on the left side of the tooling body 100. The fender limiting mechanism 600 includes a first limiting mechanism 610 and a second limiting mechanism 620. The first limiting mechanism 610 consists of a Z-shaped mounting base 611 and a first limiting pin 612 fixedly disposed on the top of the Z-shaped mounting base 611. The back of the Z-shaped mounting base 611 is detachably mounted to the tooling body 100 by bolts through several rubber buffer pads. The second limiting mechanism 620 consists of a vertically arranged strip mounting base 621 and a second limiting pin 622 fixedly disposed on the top of the strip mounting base 621. The strip mounting base 621 is directly detachably mounted to the tooling body 100 by bolts.

[0086] Among them, the Z-type mounting base 611 refers to a metal base with a three-dimensional bending structure to realize the construction of a spatial limiting reference surface. The strip mounting base 621 refers to a long strip-shaped metal block with a rectangular cross-section, which can be made of aluminum alloy or carbon steel, and its length can be adapted to different installation height requirements. The first limiting pin 612 and the second limiting pin 622 are cylindrical positioning elements to match the positioning holes of the fender. The rubber buffer pad refers to a shock-absorbing material layer with elastic deformation capability, which can be made of nitrile rubber or silicone.

[0087] Specifically, during fender assembly, the Z-shaped mounting base 611 forms a spatial limiting reference surface through its bending structure, and the first limiting pin 612 is inserted into a preset hole on the left side of the fender to achieve vertical constraint. The strip-shaped mounting base 621 is fixed vertically to the left side of the tooling body 100, and the second limiting pin 622 abuts against the edge of the fender to achieve front-rear constraint. The rubber buffer pad undergoes compression deformation under the preload of the bolts, allowing for minor adjustments to the mounting base while avoiding workpiece damage due to rigid contact. The two sets of limiting mechanisms act on different parts of the fender, working in conjunction with the fender positioning pin 502 and the right-side fender support block 200 to collaboratively limit and eliminate assembly deviations.

[0088] Furthermore, as one preferred embodiment, such as Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, this application further proposes adding a third limiting mechanism 630 to the fender limiting mechanism 600. This mechanism includes a zigzag limiting seat 631, a third limiting pin 632, a limiting block 633, an L-shaped connecting block 634, and a fixing block 635. The zigzag limiting seat 631 has a vertically arranged zigzag structure, with the third limiting pin 632 vertically installed at its top. The limiting block 633, located below the third limiting pin 632, is fixedly installed on the front side wall of the top. The L-shaped connecting block 634 has an inverted L-shaped structure. Its vertical section side wall is detachably connected to the lower side wall of the zigzag limiting seat 631 by bolts through a rubber buffer pad. The bottom of its horizontal section is detachably installed on the top of the fixing block 635 by bolts through a rubber buffer pad. The fixing block 635 is a rectangular block structure and is detachably installed on the lower end of the right side of the tooling body 100 by bolts through a rubber buffer pad.

[0089] The zigzag limiting seat 631 refers to a geometric structure formed by continuous bending, which can be achieved by stamping steel plate, with a bending angle that can be set to 120° to 150°. The third limiting pin 632 is a cylinder vertically fixed to the top of the zigzag limiting seat 631, used to insert into the pre-set positioning hole on the fender. The limiting block 633 is a boss structure located at the front end of the zigzag limiting seat 631, forming a vertically arranged limiting surface with the third limiting pin 632. The L-shaped connecting block 634 is a connecting component composed of vertical and horizontal sections, which achieves adjustable installation between the zigzag limiting seat 631 and the fixing block 635 through bolt connection. The fixing block 635 is a cuboid base with mounting holes, which can be made of cast aluminum alloy.

[0090] Specifically, during fender assembly, the third limiting pin 632 is inserted into the preset hole in the plate to complete the initial positioning. At this time, the limiting block 200 abuts against the front edge of the fender to form a secondary limiting constraint. The vertical and horizontal sections of the L-shaped connecting block 634 form a rigid support, and the connected rubber buffer pad can absorb the vibration and impact generated during assembly. By adjusting the installation position of the fixing block 635, the entire third limiting mechanism 630 can be moved laterally along the right end of the tooling body to adapt to the width dimensions of fenders of different vehicle models. When it is necessary to change vehicle models, it is only necessary to remove the mounting bolts of the fixing block 635 and move it laterally to the preset scale position and then tighten it again to complete the tooling adjustment.

[0091] Combination Figures 1 to 9 As shown, this application provides a rapid positioning auxiliary tooling for the lower part of a car fender, which can be used for assembly of multiple models and has a self-inspection function. Its working principle is as follows: Because the surface difference accuracy between the existing fender and the hood is difficult to guarantee during assembly, it relies too much on manual intervention. Therefore, this auxiliary tooling is adopted. During fender assembly, the fender is positioned by the body positioning system of other upper tooling and then cooperates with this auxiliary tooling. The clamping hook 300 is adjusted to the released state, and then the fender positioning pin 502 is inserted into the fender. The fender is attracted by the adsorption magnet 400 on the tooling. Finally, the clamping hook 300 is rotated to the tightened state to achieve precise positioning. Relying on the precise positioning system of the tooling and the car body, the assembly error of the fender can be minimized, thereby reducing the time cost of manual adjustment and making the operation more convenient. Moreover, the tooling design is flexible, which can significantly improve production efficiency and quality, reduce time costs, and adapt to flexible production of multiple models.

[0092] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0093] Secondly, the accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0094] Finally, the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lower auxiliary tooling for assembling automobile fenders, characterized in that, It includes a tooling body (100), a fender support block (200), a clamping hook (300), an adsorption magnetic block (400), and a fender positioning mechanism (500), wherein: The tooling body (100) is an inverted T-shaped plate structure. The inner wall of its right end is provided with the fender support block (200), the upper right corner of the top is provided with the fender positioning mechanism (500), and the lower and right ends of its middle are respectively provided with the adsorption magnetic block (400). The clamping hook (300) is rotatable and can be vertically installed at the bottom of the middle part of the tooling body (100), and its inner end is vertically provided with a clamping plate (322) that cooperates with the adsorption magnetic block (400) above it, so that after rotation, the lower part of the fender is pressed onto the adsorption magnetic block (400) by the clamping plate (322).

2. The lower auxiliary tooling according to claim 1, characterized in that, The tooling body (100) includes a tooling upright plate (101) and a tie rod mounting block (102) disposed at the bottom center of the tooling upright plate (101), wherein: The tooling upright plate (101) is a vertically arranged inverted T-shaped plate structure. The fender support block (200) and the adsorption magnetic block (400) are detachably installed on the inner side wall by bolts through several spaced rubber buffer pads. The pull rod mounting block (102) has a semi-circular structure and is integrally formed with the tooling plate (101), and a mounting hole for installing the clamping hook (300) is provided at its center.

3. The lower auxiliary tooling according to claim 2, characterized in that, The height of the left end of the tooling upright plate (101) is 1.2-1.5 times the height of its right end, and the width of the left end is 1 / 3-2 / 3 times the width of its right end; Furthermore, a square observation hole (103) is provided at the protruding position in the middle of the tooling plate (101), and a support connection part (104) with the top protruding upward is integrally provided at the right end for corresponding installation of the fender support block (200).

4. The lower auxiliary tooling according to claim 1, characterized in that, The fender support block (200) includes a support body (201) and a buffer pad (202), wherein: The support body (201) is a block structure with an inverted L-shaped cross-section. Its back is detachably installed on the corresponding support connection part (104) by bolts through several rubber buffer pads, and the buffer pad (202) is provided on the end face of its top protruding inward.

5. The lower auxiliary tooling according to claim 1, characterized in that, The clamping hook (300) includes a limiting bushing (310) and a pull rod body (320), wherein: The limiting bushing (310) is coaxially embedded in the mounting hole of the bottom tie rod mounting block (102) in the middle of the tooling body (100). An L-shaped limiting hole (311) is opened on the outer periphery of its inner end. The outer end is fixedly installed on the outer wall of the tie rod mounting block (102) by bolts through an integrally set cover plate (312). The pull rod body (320) is movably inserted into the limiting bushing (310). A limiting post (321) is provided on the circumference of its right end, which can be movably embedded in the L-shaped limiting hole (311). A pressing plate (322) is vertically provided at the right end, and a rotating handle (323) is vertically provided at the left end.

6. The lower auxiliary tooling according to claim 5, characterized in that, The clamping hook (300) also includes a compression spring (330) compressed and sleeved on the left end of the pull rod body (320), wherein: One end of the compression spring (330) is connected to the limiting ring at the left end of the pull rod body (320), and the other end is connected to the cover plate (312) to always apply an outward thrust to the pull rod body (320), thereby synchronously driving the pressing plate (322) to press the lower part of the fender.

7. The lower auxiliary tooling according to claim 1, characterized in that, The two sets of adsorption magnetic blocks (400) are respectively a first adsorption magnetic block (410) disposed at the lower middle part of the tooling body (100) and a second adsorption magnetic block (420) disposed at the right end of the tooling body (100) near the fender support block (200), wherein: The first adsorption magnetic block (410) is composed of a first mounting block (411) and a number of first magnets (412) embedded on the outer side wall of the first mounting block (411). The back of the first mounting block (411) is detachably mounted on the tooling body (100) by bolts through a number of rubber buffer pads. The second adsorption magnetic block (420) consists of a second mounting block (421) and several second magnets (422) embedded on the outer side wall of the second mounting block (421). The back of the second mounting block (421) is detachably mounted on the tooling body (100) by bolts through several rubber buffer pads.

8. The lower auxiliary tooling according to claim 1, characterized in that, The fender positioning mechanism (500) includes a T-shaped mounting base (501), a fender positioning pin (502), a first L-shaped connecting plate (503), and a contour support block (504), wherein: The T-shaped mounting base (501) has a T-shaped structure, and the fender positioning pin (502) is vertically arranged at the middle of its top. The inner end of the fender positioning pin (502) is set as a pointed structure, and the pointed structure can be limited to the corresponding positioning hole on the lower outer wall of the fender. The first L-shaped connecting plate (503) has an L-shaped structure. Its vertical sidewall is detachably bolted to the lower vertical section of the T-shaped mounting base (501) via several rubber buffer pads. Its horizontal end is detachably bolted to the outer sidewall of the top of the tooling body (100). The contour support block (504) consists of two sets with different thicknesses, which are respectively installed on the front sidewalls of the left and right ends of the T-shaped mounting base (501), and its front sidewall is set as a contour slope that can fit with the lower part of the fender.

9. The lower auxiliary tooling according to claim 1, characterized in that, It also includes a fender limiting mechanism (600) disposed on the left side of the tooling body (100), the fender limiting mechanism (600) including a first limiting mechanism (610) and a second limiting mechanism (620), wherein: The first limiting mechanism (610) consists of a Z-shaped mounting base (611) and a first limiting pin (612) fixedly disposed on the top of the Z-shaped mounting base (611). The back of the Z-shaped mounting base (611) is detachably mounted on the tooling body (100) by bolts through several rubber buffer pads. The second limiting mechanism (620) consists of a vertically arranged strip mounting base (621) and a second limiting pin (622) fixedly set on the top of the strip mounting base (621), and the strip mounting base (621) is directly and detachably installed on the tooling body (100) by bolts.

10. The lower auxiliary tooling according to claim 9, characterized in that, The fender limiting mechanism (600) further includes a third limiting mechanism (630), which includes a zigzag limiting seat (631), a third limiting pin (632), a limiting block (633), an L-shaped connecting block (634), and a fixing block (635), wherein: The zigzag limiting seat (631) is in the form of a vertically arranged zigzag structure. The third limiting pin (632) is vertically set at its top, and the limiting block (633) is fixedly set on the front side wall of the top. The limiting block (633) is located below the front end of the third limiting pin (632). The L-shaped connecting block (634) has an inverted L-shaped structure. The sidewall of its vertical section is detachably connected to the lower sidewall of the zigzag limiting seat (631) via bolts using several rubber buffer pads. The bottom of its horizontal section is detachably mounted to the top of the fixing block (635) via bolts using several rubber buffer pads. The fixing block (635) is a rectangular block structure, which is detachably installed at the lower end of the right side of the tooling body (100) by bolts through several rubber buffer pads.

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