Automotive front-end component assembly quality analysis tools, usage methods and design methods

Abstract

This invention discloses an assembly quality analysis tool, its usage method, and a design method for automotive front-end parts. The analysis tool includes a mounting frame with a front hood contouring module at its center for mounting the front hood. Fender contouring modules are located on both sides of the front hood contouring module in the Y direction for mounting the fenders. Endplate contouring modules are located on both sides of the bottom of the mounting frame in the Y direction. Each endplate contouring module includes a base plate with multiple X-direction positioning blocks on it. Each X-direction positioning block includes an X-direction positioning surface. At least one X-direction positioning block is configured as an adjustable positioning block, and the X-direction positioning surface of the adjustable positioning block can move along the X direction. The advantages of this invention are that it can quickly identify key dimensional points of the front-end panel, optimize and adjust key dimensions of the front-end panel, solve front-end appearance quality problems, and improve problem-solving efficiency; it also reduces unnecessary temporary adjustment tools and processes in the vehicle manufacturing process, thus lowering overall vehicle manufacturing costs.

Description

Technical Field

[0001] This invention relates to the field of automotive assembly technology, and more specifically, to a tool for analyzing the assembly quality of automotive front-end parts, its usage method, and its design method. Background Technology

[0002] In the automotive manufacturing process, parts such as the hood, fenders, front longitudinal beams, front panel, frame, headlights, front guide components, and front bumper constitute the front end of the vehicle. Manufacturing processes require the initial installation of sheet metal parts such as the front panel, longitudinal beams, fenders, and hood. The front panel, as a crucial positioning component, plays a vital role in the overall visual effect of the hood, headlights, and bumper, ensuring proper fit and alignment. Conventional assembly quality analysis methods involve analyzing assembly relationships and comparing them with part measurement reports. This process is lengthy, allows for inference but not practical verification, and fails to identify key dimensional influencing points of positioning parts or analyze the impact of translational or rotational changes in these key dimensions on front-end appearance defects.

[0003] In the process of analyzing and optimizing quality issues at the front end of vehicle manufacturing, the assembly dimension chain of the front end of the car is long and the assembly and positioning relationships of the parts are complex. In order to accurately analyze the impact of the translation and rotation of the key dimensions of the front end plate on the appearance quality of the front end of the vehicle, it is necessary to design a quality issue analysis tool for the front end of the car based on the structure and process characteristics of the vehicle. By analyzing the impact of the translation and rotation of the key dimensions of the front end plate on the external gaps and flush defects of the front end, the simulation analysis function can be realized. Summary of the Invention

[0004] To solve at least one of the above-mentioned technical problems, the present invention provides an assembly quality analysis tool, a method of use, and a design method for automotive front-end parts. The analysis tool is equipped with an end plate contouring module, which includes a base plate and an adjustable positioning block. Moving the portion of the base plate connected to the adjustable positioning block along the X-axis can simulate the translation and rotation changes of key dimensions of the front-end plate.

[0005] The present invention solves the technical problem by adopting the following technical solution:

[0006] A tool for analyzing the assembly quality of automotive front-end parts includes a mounting frame. A front hood contouring module is disposed in the middle of the mounting frame for mounting the front hood. Fender contouring modules are disposed on both sides of the front hood contouring module in the Y direction for mounting the fenders. End plate contouring modules are disposed on both sides of the bottom of the mounting frame in the Y direction. Each end plate contouring module includes a base plate, and a plurality of X-direction positioning blocks are disposed on the base plate. Each X-direction positioning block includes an X-direction positioning surface. At least one X-direction positioning block is configured as an adjustable positioning block, and the X-direction positioning surface of the adjustable positioning block can move along the X direction.

[0007] Furthermore, the adjustable positioning block includes a guide block, an adjusting block, and a locking mechanism. The guide block is fixedly disposed on one side of the base plate, and a groove extending along the X direction is provided at the bottom of the guide block. The adjusting block includes a sliding part and a positioning part. The sliding part is provided with a slide rail adapted to the groove, and the slide rail is slidably connected to the groove. The locking mechanism can lock the relative position of the slide rail and the groove. Preferably, both the groove and the slide rail are trapezoidal, and the length of the upper base of the trapezoid is greater than the length of the lower base.

[0008] Furthermore, the locking mechanism includes a set screw, and the sidewall of the slide groove is provided with a first threaded hole extending in the Y direction, through which the set screw passes.

[0009] Furthermore, the locking mechanism includes a first connecting plate and a screw, the first connecting plate being fixedly mounted on the guide block; the sliding part is provided with a second threaded hole extending in the X direction, the screw passing through the first connecting plate and threadedly connected to the second threaded hole; the screw is provided with a first retaining ring and a second retaining ring respectively located on both sides of the first connecting plate.

[0010] Furthermore, one of the guide block and the sliding part is provided with a scale line, and the other is provided with a pointer pointing towards the scale line, so as to facilitate control of the adjustment amount of the guide block in the X direction.

[0011] Furthermore, each of the substrates is provided with a positioning pin extending along the X direction, the positioning pin being adapted to the positioning hole of the front end plate; the positioning pin of one end plate contouring module is set as a first positioning pin, the positioning post of the first positioning pin being set as a circular pin; the positioning pin of the other end plate contouring module is set as a second positioning pin, the positioning post of the second positioning pin being set as a rhombus pin, the upper and lower ends of the rhombus pin being set as arcs adapted to the positioning hole of the front end plate; preferably, the other end of the second positioning pin is set as a cylinder, the outer wall of the cylinder being provided with a rectangular groove; preferably, the X-direction positioning block includes two fixed positioning blocks symmetrically fixedly arranged on the upper end of the substrate in the Y direction and two adjustable positioning blocks symmetrically arranged on the lower end of the substrate in the Y direction; or an adjustable positioning block is provided at each of the four corners of the two end plate contouring modules.

[0012] Furthermore, the fixing frame includes a horizontal frame and two vertical frames, the vertical frames being vertically disposed at the bottom of the horizontal frame;

[0013] The front hood contouring module includes a front hood contouring surface and a first bracket. The front hood contouring surface is disposed in the middle of the top surface of the horizontal frame via the first bracket. The fender contouring module includes a fender contouring surface and a second bracket. The fender contouring surface is disposed on the top surface and side surface of the horizontal frame via the second bracket. A first pad is disposed between the first bracket and the top surface of the horizontal frame. A second pad and a third pad are disposed between the second bracket and the top surface and side surface of the horizontal frame, respectively.

[0014] The substrate is fixed to one side of the vertical frame by a second connecting plate; a handle is provided on the other side of the vertical frame.

[0015] Furthermore, a method for using an automotive front-end parts assembly quality analysis tool, applied to the aforementioned analysis tool, includes the following steps:

[0016] Step 1: Place the analysis tool on the body-in-white frame and perform coarse positioning of the hood contouring module, fender contouring module, and end plate contouring module with the hood, fender, and front end plate, respectively.

[0017] Step 2: Insert the positioning pins of the two end plate contouring modules into the positioning holes of the left and right front plates respectively to achieve the YZ direction limit of the first positioning pin and the Z direction limit of the second positioning pin; fit the X direction positioning surface of each X direction positioning block with the front plate and lock it with bolts.

[0018] Step 3: Based on the quality defects of the front-end parts, determine the base plate part connected to the adjustable positioning block to be adjusted, its first direction of movement, and the adjustment amount L.

[0019] Step 4: Move the base plate portion connected to the adjustable positioning block by a distance L along the first direction, adjust the posture of the front cover and left and right fenders, and fix them after matching with the front cover contouring module and the fender contouring module respectively.

[0020] Step 5: After removing the tools, install the front-end component assembly onto the front-end plate;

[0021] Step 6: Analyze the matching quality of the hood and fenders with adjacent parts; if the matching quality meets the requirements, proceed to step 7; if the matching quality does not meet the requirements, return to step 3 until the matching quality meets the requirements.

[0022] Step 7: Adjust the end plate welding fixture so that the front end plate profile corresponding to the adjustable positioning block to be adjusted moves a distance L in the opposite direction of the first direction.

[0023] Furthermore, the method of use also includes: analyzing the matching quality of the front cover and fender with adjacent parts; when the matching quality meets the requirements, locking the position of each adjustable positioning block; using the analysis tool as a tooling for the front cover and fender; and installing the front cover and fender on a vehicle with a defective front panel.

[0024] Furthermore, a design method for an automotive front-end parts assembly quality analysis tool, applied to the aforementioned analysis tool, includes the following steps:

[0025] Step 100: Extract the surface data of the front panel from the three-dimensional data of the whole vehicle. The surface data of the front panel includes the surface curve, the positioning hole outline, the square hole outline and the four corner threaded hole outlines. The extracted front panel surface data is stretched in the normal direction to form a first surface entity. The first surface entity includes the positioning hole through hole, the square hole through hole and the four corner through holes.

[0026] Step 200: Select four X-direction rectangular regions on the first surface solid, including four corner through holes. The side length of the rectangular regions is set to 25-30mm, and the center of the rectangular regions is concentric with the corner through holes. Cut the side of the first surface solid near the front end plate to obtain four rectangular blocks and a first plane. Each rectangular block is perpendicular to the first plane. The X-direction thickness of each rectangular block is set to 5-10mm. The surface of each rectangular block that fits against the front end plate surface forms an X-direction positioning surface.

[0027] Step 300: Cut off the first surface solid part connected to the rectangular block corresponding to the adjustable positioning block, obtain the second surface solid, separate the second surface solid from the rectangular block corresponding to the adjustable positioning block, and set the positioning part and sliding part based on the X-direction positioning surface of the rectangular block corresponding to the adjustable positioning block to obtain the adjustment block.

[0028] Step 400: Cut the side of the second surface entity away from the front end plate into a second plane to obtain the substrate; set the guide block and locking mechanism according to the adjustment block and the substrate to obtain the adjustable positioning block, thereby obtaining the end plate contouring module;

[0029] Step 500: After reducing the radius of the positioning hole outline on the substrate by 0.05-0.2mm, stretch it normally to both sides. The positioning pin on the side closer to the front plate extends into the positioning hole of the front plate, obtains the positioning pin data, and sets the positioning pin of one positioning pin as a diamond pin.

[0030] Step 600: Extract the front edge data of the hood and the fender evaluation surface, and stretch the extracted data with a 3-5mm gap to form the hood contour surface and the fender contour surface;

[0031] Step 700: Based on the front hood contour surface, fender contour surface, and end plate contour module, set up a horizontal frame, two vertical frames, a first bracket, a second bracket, and a second connecting plate, so that the front hood contour surface is connected to the middle of the top surface of the horizontal frame through the first bracket, the fender contour surface is connected to the top and side surfaces of the horizontal frame through the second bracket, and the end plate contour module is connected to one side of the vertical frame through the second connecting plate.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] (1) This analysis tool can realize the spatial translation and rotation of the substrate by moving the substrate part connected to the adjustable positioning block along the X direction. It can adjust the position of the fixing frame, that is, adjust the position of the front cover contouring module and the fender contouring module, thereby adjusting the relative position of the front cover, fender and front end plate. It can simulate the spatial translation and rotation of the key dimensions of the front end plate, and can conveniently analyze the influence of the changes in the translation and rotation of the key dimensions of the front end plate on the external gap and flush defects of the front end, realize accurate simulation analysis, reserve the assembly dimensions of the front cover and fender, and realize rapid adjustment analysis by reversing the verification of the adjustment amount of the key dimension points of the front end plate through the reservation.

[0034] (2) It can quickly and accurately identify the key dimensions of the front panel, optimize and adjust the key dimensions of the front panel, solve the front appearance quality problem, improve the aesthetics of the front of the product, ensure the uniformity of the gaps, and enhance the competitiveness of the product; reduce the time for dimension defect analysis and optimization, and improve the efficiency of problem solving; at the same time, reduce unnecessary temporary adjustment tools and adjustment processes in the whole vehicle manufacturing process, and reduce rework costs and whole vehicle manufacturing costs.

[0035] (3) This analysis tool can be used as a tooling for the front cover and fenders, and the front cover and fenders can be installed on vehicles with defective front panels, so that the assembly quality of each part of the front of the vehicle meets the requirements, which can reduce the number of defective vehicles and reduce the frequency of rework. Attached Figure Description

[0036] To better understand the above and other objects, features, advantages, and functions of the present invention, reference can be made to the embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of the invention and do not limit the scope of the invention in any way; the parts in the drawings are not drawn to scale.

[0037] Figure 1 This is a schematic diagram of the assembly quality analysis tool for automotive front-end parts of the present invention.

[0038] Figure 2 This is a side view structural diagram of the automotive front-end parts assembly quality analysis tool of the present invention.

[0039] Figure 3 This is a schematic diagram of the rear view structure of the automotive front-end parts assembly quality analysis tool of the present invention.

[0040] Figure 4 This is an enlarged structural schematic diagram of the first embodiment A of the present invention.

[0041] Figure 5 This is an enlarged structural schematic diagram of the second embodiment A of the present invention.

[0042] Figure 6This is an enlarged structural schematic diagram of the present invention B.

[0043] Figure 7 This is an enlarged structural schematic diagram of the present invention C.

[0044] Figure 8 This is a schematic diagram of the structure of the automotive front-end parts assembly quality analysis tool of the present invention during use.

[0045] In the diagram: 10-Fixed frame; 11-Horizontal frame; 12-Vertical frame; 13-Handle; 20-Front cover contouring module; 21-Front cover contouring surface; 22-First bracket; 30-Fender contouring module; 31-Fender contouring surface; 32-Second bracket; 40-End plate contouring module; 41-Base plate; 42-Adjustable positioning block; 421-Guide block; 422-Adjusting block; 4221-Sliding part; 4221a-Slide rail; 4222-Positioning part; 4222a-X-direction positioning surface; 43-Setting screw; 44-First connecting plate; 45-Screw; 451-First retaining ring; 452-Second retaining ring; 46-First positioning pin; 47-Second positioning pin; 471-Rectangular groove; 48-Fixed positioning block; 49-Second connecting plate; 410-Bolt; 50-Front cover; 60-Fender; 70-Front end plate. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0047] In the description of this invention, it should be noted that the term "comprising" and its variations indicate an open-ended inclusion, i.e., "including but not limited to". The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. Directions "X", "Y", and "Z" refer to the vehicle coordinate system directions, with the vehicle's driving direction as the X direction, the direction from the driver's side to the passenger side as the Y direction, and the vehicle height direction as the Z direction.

[0048] This invention provides a tool for analyzing the assembly quality of automotive front-end parts, such as... Figures 1-7As shown, the device includes a mounting frame 10, a front cover contouring module 20 for mounting the front cover 50 is provided in the middle of the mounting frame 10; fender contouring modules 30 are provided on both sides of the front cover contouring module 20 in the Y direction for mounting the fender 60; end plate contouring modules 40 are provided on both sides of the bottom Y direction of the mounting frame 10, each end plate contouring module 40 includes a base plate 41, a plurality of X-direction positioning blocks are provided on the base plate 41, each X-direction positioning block includes an X-direction positioning surface 4222a; at least one X-direction positioning block is configured as an adjustable positioning block 42, and the X-direction positioning surface 4222a of the adjustable positioning block 42 can move along the X direction.

[0049] The front cover contouring module 20 is located in the middle of the mounting bracket 10 and is used to match the leading edge of the front cover 50 when the front cover 50 is installed. The fender contouring module 30 and the end plate contouring module 40 are symmetrically arranged on both sides of the Y direction, that is, symmetrically distributed on both sides of the ZX plane of the vehicle coordinate system. The fender contouring module 30 is located on both sides of the front cover contouring module 20 and is used to match the fender 60 when the fender 60 is installed. The X-direction positioning block of the end plate contouring module 40 is used to match the profile of the front end plate 70. The X-direction positioning surface 4222a of the adjustable positioning block 42 can move along the X direction, that is, the part of the base plate 41 connected to the adjustable positioning block 42 and the X-direction positioning surface 4222a of the adjustable positioning block 42 can move relative to each other along the X direction. The adjustable positioning block 42 can be set according to the key dimension points of the front end plate 70. For example, each X-direction positioning block can be set at the four corners of the base plate 41, and the adjustable positioning block 42 can be set to two, three, four, etc.

[0050] refer to Figure 8As shown, when using this tool, the vehicle front panel 70 is fixed, and the X-direction positioning surfaces 4222a of each X-direction positioning block are aligned with the profile of the front panel 70. Moving the base plate 41 portion connected to the adjustable positioning block 42 along the X-direction adjusts the position of the fixing frame 10, i.e., the position of the front cover contouring module 20 and the fender contouring module 30, thereby adjusting the relative position of the front cover 50, fender 60, and front panel 70. When the base plate 41 portions connected to each adjustable positioning block 42 move the same distance along the X-direction, spatial translation of the base plate 41 can be achieved. When the base plate 41 portions connected to each adjustable positioning block 42 move different distances along the X-direction, spatial rotation of the base plate 41 can be achieved. With the front panel 70 fixed, the positions of the front cover 50 and fender 60 are adjusted by moving the base plate 41 connected to the adjustable positioning block 42. This is equivalent to keeping the front cover 50 and fender 60 fixed and adjusting the position of the front panel 70 in the opposite direction. This allows the relative positions of the front cover 50, fender 60 and the front panel 70 to be consistent in both adjustment methods. In other words, the key dimensions of the front panel 70 can be simulated to undergo spatial translation and rotation. By adjusting the base plate 41 connected to the adjustable positioning block 42, the influence of the translation and rotation of the key dimensions of the front panel 70 on the external gaps and flush defects of the front end can be analyzed, thus achieving accurate simulation analysis.

[0051] In one embodiment, reference Figure 4 and Figure 5 As shown, the adjustable positioning block 42 includes a guide block 421, an adjusting block 422, and a locking mechanism. The guide block 421 is fixedly disposed on one side of the substrate 41, and a groove extending in the X direction is provided at the bottom of the guide block 421. The adjusting block 422 includes a sliding part 4221 and a positioning part 4222. The sliding part 4221 is provided with a slide rail 4221a that matches the groove, and the slide rail 4221a is slidably connected to the groove. The locking mechanism can lock the relative position of the slide rail 4221a and the groove. The movement of the groove along the slide rail 4221a can adjust the X-direction position of the guide block 421. The guide block 421 is fixedly disposed on the substrate 41 and can drive the part of the substrate 41 connected to the guide block 421 to move. When the part of the substrate 41 connected to the guide block 421 moves into position, it can be locked by the locking mechanism.

[0052] Preferably, both the slide groove and the slide rail 4221a are trapezoidal, with the upper base being longer than the lower base. The slide groove and slide rail 4221a are wider at the top and narrower at the bottom to prevent the adjusting block 422 from falling out of the slide groove.

[0053] In one embodiment, such as Figure 4As shown, the locking mechanism includes a set screw 43, and the side wall of the slide groove is provided with a first threaded hole extending in the Y direction, through which the set screw 43 passes. After the slide groove is moved to the desired X-direction position along the slide rail 4221a, the set screw 43 is tightened, and the set screw 43 abuts against the slide rail 4221a, thus locking the relative position of the slide rail 4221a and the slide groove. Multiple set screws 43 can be provided for a secure lock.

[0054] In one embodiment, such as Figure 5 As shown, the locking mechanism includes a first connecting plate 44 and a screw 45. The first connecting plate 44 is fixedly mounted on the guide block 421. The sliding part 4221 is provided with a second threaded hole extending in the X direction. The screw 45 passes through the first connecting plate 44 and is threadedly connected to the second threaded hole. The screw 45 is provided with a first retaining ring 451 and a second retaining ring 452 located on both sides of the first connecting plate 44.

[0055] Specifically, the first connecting plate 44 includes a horizontal plate and two vertical plates perpendicularly connected to the horizontal plate. The two vertical plates are located at opposite ends of the horizontal plate in the X direction. The upper vertical plate of the first connecting plate 44 can be fixedly connected to the guide block 421. The screw 45 passes through the lower vertical plate of the first connecting plate 44 and is screwed into the second threaded hole. When the screw 45 rotates, the first retaining ring 451 or the second retaining ring 452 abuts against the lower vertical plate, preventing the screw 45 from moving in the X direction, so that the screw 45 can only rotate around its axial direction. Therefore, the screw 45 and the sliding part 4221 form a screw drive. When the X-direction positioning surface 4222a of the adjusting block 422 is fixed, the rotation of the screw 45 can drive the guide block 421 to move in the X direction, that is, adjust the relative position of the guide block 421 and the adjusting block 422 in the X direction. The X-direction position of the guide block 421 can be precisely adjusted by the screw 45. When the screw 45 stops rotating, the relative position of the slide rail 4221a and the slide groove is locked.

[0056] In one embodiment, one of the guide block 421 and the sliding part 4221 is provided with a scale line, and the other is provided with a pointer pointing towards the scale line. The distance the guide block 421 moves along the X-axis can be precisely adjusted using the scale line and the pointer, facilitating control of the adjustment amount of the guide block 421 in the X-axis. The adjustment amount of the base plate 41 portion connected to the adjustable positioning block 42 is generally ±3mm, and the graduation value of the scale line can be set as needed, such as 0.5mm, 1mm, etc.

[0057] In one embodiment, reference Figure 6 and Figure 7 As shown, each of the substrates 41 is provided with a positioning pin extending along the X direction, and the positioning pin is adapted to the positioning hole of the front end plate 70. Figure 6 As shown, the positioning pin of an end plate contouring module 40 is set as a first positioning pin 46, and the positioning post of the first positioning pin 46 is set as a circular pin; as Figure 7 As shown, the positioning pin of the other end plate contouring module 40 is set as the second positioning pin 47, and the positioning post of the second positioning pin 47 is set as a diamond pin. The upper and lower ends of the diamond pin are set as arcs that are adapted to the positioning holes of the front end plate 70.

[0058] When the end plate contouring module 40 is installed on the front end plate 70, the positioning pins are inserted into the positioning holes of the front end plate 70. The positioning post of the first positioning pin 46 is set as a round pin, which can position the front end plate 70 in the YZ direction. The positioning post of the second positioning pin 47 is set as a diamond-shaped pin, which can position the front end plate 70 in the Z direction. When there is a dimensional deviation between the two positioning pins or the Y-direction distance of the front end plate 70, the two positioning pins can still be inserted into the positioning holes of the two front end plates 70 because the gap between the Y-direction sidewall of the diamond-shaped positioning pin and the positioning hole of the front end plate 70 is relatively large, which facilitates the installation of the analysis tool on the two front end plates 70.

[0059] The diamond-shaped pin of the second positioning pin 47 positions the front end plate 70 assembled with it in the Z direction. When the second positioning pin 47 is installed on the base plate 41, the arc of the diamond-shaped pin of the second positioning pin 47 needs to be in the vertical direction. The other end of the second positioning pin 47 can be set as a cylinder, and a rectangular groove 471 is provided on the outer wall of the cylinder. When installing the second positioning pin 47, the direction of the diamond-shaped pin can be controlled according to the direction of the rectangular groove 471, so that the upper and lower arcs of the diamond-shaped pin are roughly vertically distributed.

[0060] To prevent over-positioning, each end plate contouring module 40 is provided with a positioning pin, which is adapted to the upper or lower positioning hole of the front end plate 70. Preferably, the positioning pins of both end plate contouring modules 40 are adapted to the upper positioning hole of the front end plate 70. The X-direction positioning block includes two fixed positioning blocks 48 symmetrically fixed to the upper end of the substrate 41 in the Y direction and two adjustable positioning blocks 42 symmetrically disposed at the lower end of the substrate 41 in the Y direction; or an adjustable positioning block 42 is provided at each of the four corners of the two end plate contouring modules 40.

[0061] In one embodiment, reference Figures 1-3As shown, the fixing frame 10 includes a horizontal frame 11 and two vertical frames 12, with the vertical frames 12 vertically positioned at the bottom of the horizontal frame 11. The front cover contouring module 20 includes a front cover contouring surface 21 and a first bracket 22, with the front cover contouring surface 21 positioned at the center of the top surface of the horizontal frame 11 via the first bracket 22. The fender contouring module 30 includes a fender contouring surface 31 and a second bracket 32, with the fender contouring surface 31 positioned on the top and side surfaces of the horizontal frame 11 via the second bracket 32. Preferably, a first pad is provided between the first bracket 22 and the top surface of the horizontal frame 11; a second pad and a third pad are respectively provided between the second bracket 32 ​​and the top and side surfaces of the horizontal frame 11. The first pad allows adjustment of the front cover contouring surface 21 in the Z direction, while the second and third pads allow adjustment of the fender contouring surface 31 in the Z and Y directions, respectively. For example, multiple pads of different specifications can be used to achieve an adjustment range of 1-5mm. The substrate 41 is fixedly mounted on one side of the vertical frame 12 via the second connecting plate 49; a handle 13 is provided on the other side of the vertical frame 12. The handles 13 on the two vertical frames 12 facilitate easy access and handling of the tool. This analytical tool can be made of carbon fiber, making it lighter and more durable, reducing operator workload, and conforming to ergonomic principles.

[0062] This invention also provides a method for using an assembly quality analysis tool for automotive front-end parts, applied to the analysis tool described above, comprising the following steps:

[0063] Step 1: Place the analysis tool on the body-in-white frame and roughly position the front hood contouring module 20, fender contouring module 30 and end plate contouring module 40 with the front hood 50, fender 60 and front end plate 70 respectively.

[0064] Step 2: Insert the positioning pins of the two end plate contouring modules 40 into the positioning holes of the left and right front end plates 70 respectively to achieve the YZ direction limit of the first positioning pin 46 and the Z direction limit of the second positioning pin 47; fit the X direction positioning surface 4222a of each X direction positioning block with the front end plate 70 and lock it with bolts 410.

[0065] Step 3: Based on the quality defects of the front-end parts, determine the part of the base plate 41 connected to the adjustable positioning block 42 to be adjusted, its first direction of movement, and the adjustment amount L.

[0066] Step 4: Move the portion of the base plate 41 connected to the adjustable positioning block 42 along the first direction by a distance L, adjust the posture of the front cover 50 and the left and right fenders 60, and fix them after matching with the front cover contouring module 20 and the fender contouring module 30 respectively.

[0067] Step 5: After removing the tools, install the front-end component assembly onto the front-end plate 70;

[0068] Step 6: Analyze the matching quality of the front cover 50 and fender 60 with adjacent parts; if the matching quality meets the requirements, proceed to step 7; if the matching quality does not meet the requirements, return to step 3 until the matching quality meets the requirements.

[0069] Step 7: Adjust the end plate welding fixture so that the front end plate 70 surface corresponding to the adjustable positioning block 42 to be adjusted moves a distance L in the opposite direction of the first direction.

[0070] The X-axis positioning block has a through hole in the middle. In step 2, after the X-axis positioning surface 4222a of each X-axis positioning block is attached to the front end plate 70, it is fixed with bolts 410 to make the initial position of the analysis tool accurate and to record the scale mark pointed to by the pointer at this time.

[0071] In step 3, multiple positional data of the front-end plate 70 corresponding to the adjustable part of the end plate welding fixture can be measured. Dimensions with significant deviations from the design values ​​can be identified as key dimensions of the front-end plate 70 requiring adjustment, and the opposite direction of the deviation can be used as the adjustment direction for the analysis tool. The gaps and flushing of each area to be evaluated can also be measured, and adjustments can be made based on these gaps and flushing. For example, if the gap between the headlight and fender 60 is large, along with a large gap between the front cover 50 and the front bumper, assuming the Z-axis posture of the fender 60 needs to be verified by rotating it upwards and backwards, the X-axis forward direction is used as the first direction. The portion of the base plate 41 connected to the adjustable positioning block 42 is adjusted forward, starting with 1mm. If the defect improves, the adjustment increment is 0.5mm, and the moving distance L is 1mm, 1.5mm, or 2mm, etc., until the large gaps between the headlight and fender 60, and between the front cover 50 and the front bumper, are improved or eliminated. If the gap increases after adjustment in the X-axis forward direction, the adjustment is reversed for verification.

[0072] In step 4, the substrate 41 portions connected to the adjustable positioning block 42 at multiple key dimension points of the front panel 70 can be translated in the X direction simultaneously to reserve the assembly posture for parts such as the fender 60 and the front cover 50. When the substrate 41 portions connected to the adjustable positioning block 42 are moved a distance L along the first direction by rotating the screw 45, if the X-direction positioning block has a fixed positioning block 48, and the fixed positioning block 48 has been fixed to the front panel 70 by bolts 410 in step 2, the bolts 410 can be loosened first, and the substrate 41 portions connected to the adjustable positioning block 42 can be adjusted into place before tightening the bolts 410. The front cover 50 and the fender 60 are not initially fixed and their posture can be adjusted. During the posture adjustment process, feeler gauges and flushing gauges can be used to determine the gap and flushing status between the front cover 50 and the front cover contouring module 20, and between the fender 60 and the fender contouring module 30. After adjustment and matching, they are fixed.

[0073] After removing the tools and installing the front-end component assembly onto the front-end plate 70, the front-end components are in place. The matching quality of the front cover 50 and fender 60 with adjacent components can then be analyzed. The impact of changes in key dimensions of the front-end plate 70 on the dimensions of the contoured areas of components such as the front cover 50 and fender 60 can be analyzed, enabling functional analysis and simulation of the translational or rotational attitude of the front-end plate 70 components. For example, the gaps and flushing states of adjacent components such as the front cover 50 and the front bumper, the fender 60 and the front bumper, the fender 60 and the headlight, and the fender 60 and the wheel arch can be analyzed. If the matching quality at each location meets the requirements, it indicates that the distance L of the portion of the base plate 41 connected to the adjustable positioning block 42 that needs adjustment along the first direction is appropriate, meaning the reverse allowance of the front-end plate 70 is appropriate. The key dimension adjustment data is then recorded, and the allowance dimension state of the front-end plate 70 is locked. Then, proceed to step 7, adjusting the end plate welding fixture so that the front plate 70 profile corresponding to the adjusted adjustable positioning block 42 moves a distance L in the opposite direction to the first direction. During the assembly of the front plate 70, batch adjustments can be made to optimize the key dimensions of the front plate 70 parts, complete the problem analysis and adjustment, and fundamentally solve the size problem. If the matching quality does not meet the requirements, each part can be disassembled. After loosening the front cover 50 and the fender 60, the base plate 41 part connected to the adjustable positioning block 42 can be readjusted until the matching quality meets the requirements.

[0074] This method allows for standardized dimensional simulation and reserve analysis, enabling faster dimensional reserve or dimensional function simulation, improving the efficiency of quality problem solving, and reducing the overall vehicle manufacturing cost.

[0075] The method of use also includes: analyzing the matching quality of the front cover 50 and fender 60 with adjacent parts; when the matching quality meets the requirements, locking the position of each adjustable positioning block 42; using the analysis tool as a tooling for the front cover 50 and fender 60; and installing the front cover 50 and fender 60 on the vehicle with a defective front end plate 70.

[0076] When assembling the front cover 50 and fender 60, the locating pins of the two end plate contouring modules 40 are inserted into the locating holes of the left and right front end plates 70 to achieve the YZ direction limiting of the first locating pin 46 and the Z direction limiting of the second locating pin 47; the X-direction locating surfaces 4222a of each locked X-direction locating block are then fitted with the front end plate 70; the postures of the front cover 50 and the left and right fenders 60 are then adjusted and fixed after matching with the front cover contouring module 20 and the fender contouring module 30, respectively, thus completing the assembly of the front cover 50 and fender 60. At this time, although there is a deviation in the front end plate 70, the assembly quality of each part of the vehicle's front end meets the requirements, which can reduce the number of defective vehicles and reduce the frequency of rework.

[0077] When using this analysis tool, you can pick it up using handle 13. Before use, you can visually inspect the parts to ensure they are intact and undamaged, thus ensuring the accuracy of the adjustments.

[0078] This invention also provides a design method for an assembly quality analysis tool for automotive front-end parts, applied to the analysis tool described above, with reference to... Figure 8 As shown, it includes the following steps:

[0079] Step 100: Extract the surface data of the front panel 70 from the three-dimensional data of the whole vehicle. The surface data of the front panel 70 includes the surface curve, the positioning hole outline, the square hole outline and the four corner threaded hole outlines of the front panel 70. The extracted surface data of the front panel 70 is stretched in the normal direction to form a first surface solid. The first surface solid includes the positioning hole through hole, the square hole through hole and the four corner through holes.

[0080] Step 200: Select four X-direction rectangular regions on the first surface solid, including four corner through holes. The side length of the rectangular regions is set to 25-30mm, and the center of the rectangular regions is concentric with the corner through holes. Cut the side of the first surface solid close to the front end plate 70 to obtain four rectangular blocks and a first plane. Each rectangular block is perpendicular to the first plane. The X-direction thickness of each rectangular block is set to 5-10mm. The surface of each rectangular block that fits into the surface of the front end plate 70 forms an X-direction positioning surface 4222a.

[0081] Step 300: Cut off the first surface solid part connected to the rectangular block corresponding to the adjustable positioning block 42, obtain the second surface solid, separate the second surface solid from the rectangular block corresponding to the adjustable positioning block 42, and set the positioning part 4222 and the sliding part 4221 based on the X-direction positioning surface 4222a of the rectangular block corresponding to the adjustable positioning block 42, and obtain the adjustment block 422.

[0082] Step 400: Cut the side of the second surface entity away from the front end plate 70 into a second plane to obtain the substrate 41; set the guide block 421 and the locking mechanism according to the adjustment block 422 and the substrate 41 to obtain the adjustable positioning block 42, thereby obtaining the end plate contouring module 40.

[0083] Step 500: After reducing the radius of the positioning hole outline on the substrate 41 by 0.05-0.2mm, stretch it normally to both sides. The positioning post on the side closer to the front end plate 70 extends into the positioning hole of the front end plate 70, obtains the positioning pin data, and sets the positioning post of one positioning pin as a diamond pin.

[0084] Step 600: Extract the front edge data of the hood 50 and the evaluation surface data of the fender 60, and stretch the extracted data with a gap of 3-5mm to form the hood contour surface 21 and the fender contour surface 31; the hood contour surface 21 and the fender contour surface 31 can adopt a segmented design structure.

[0085] Step 700: Based on the front cover contour surface 21, the fender contour surface 31, and the end plate contour module 40, set up a horizontal frame 11, two vertical frames 12, a first bracket 22, a second bracket 32, and a second connecting plate 49, so that the front cover contour surface 21 is connected to the middle of the top surface of the horizontal frame 11 through the first bracket 22, the fender contour surface 31 is connected to the top and side surfaces of the horizontal frame 11 through the second bracket 32, and the end plate contour module 40 is connected to one side of the vertical frame 12 through the second connecting plate 49.

[0086] The front panel 70 can be curved or planar; correspondingly, the extracted front panel 70's surface profile can be either curved or planar. Using the 3D data of the vehicle's front panel 70, hood 50, and fender 60, this analysis tool can be easily and quickly designed using software such as CATIA and Solidworks. This simplifies the design process, allows for customization of the analysis tool based on analysis and functional simulation requirements, provides guidance for problem analysis and dimensional optimization, saves significant time, improves design efficiency, reduces error rates, enhances the efficiency of resolving front-end quality issues, and lowers product manufacturing costs.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A tool for analyzing the assembly quality of automotive front-end parts, characterized in that, The device includes a mounting frame, a front cover contouring module in the middle for mounting the front cover, fender contouring modules on both sides of the front cover contouring module in the Y direction for mounting the fenders, and end plate contouring modules on both sides of the bottom of the mounting frame in the Y direction. Each end plate contouring module includes a base plate, and multiple X-direction positioning blocks are provided on the base plate. Each X-direction positioning block includes an X-direction positioning surface. At least one X-axis positioning block is configured as an adjustable positioning block, the X-axis positioning surface of which is movable along the X-axis; the adjustable positioning block includes a guide block, an adjustment block, and a locking mechanism, the guide block is fixedly disposed on one side of the substrate, and the bottom of the guide block is provided with a slide groove extending along the X-axis; the adjustment block includes a sliding part and a positioning part, the sliding part is provided with a slide rail adapted to the slide groove, and the slide rail is slidably connected to the slide groove; the locking mechanism is capable of locking the relative position of the slide rail and the slide groove; Each of the substrates is provided with a positioning pin extending along the X direction, the positioning pin being adapted to the positioning hole of the front end plate; the positioning pin of one end plate contouring module is set as a first positioning pin, the positioning post of the first positioning pin is set as a circular pin; the positioning pin of the other end plate contouring module is set as a second positioning pin, the positioning post of the second positioning pin is set as a diamond pin, the upper and lower ends of the diamond pin are set as arcs adapted to the positioning hole of the front end plate.

2. The automotive front-end parts assembly quality analysis tool according to claim 1, characterized in that, Both the slide groove and the slide rail are trapezoidal, with the upper base length being greater than the lower base length.

3. The automotive front-end parts assembly quality analysis tool according to claim 1, characterized in that, The locking mechanism includes a set screw, and the sidewall of the slide groove is provided with a first threaded hole extending in the Y direction, through which the set screw passes.

4. The automotive front-end parts assembly quality analysis tool according to claim 1, characterized in that, The locking mechanism includes a first connecting plate and a screw. The first connecting plate is fixedly mounted on the guide block. The sliding part is provided with a second threaded hole extending in the X direction. The screw passes through the first connecting plate and is threadedly connected to the second threaded hole. The screw is provided with a first retaining ring and a second retaining ring located on both sides of the first connecting plate.

5. The automotive front-end parts assembly quality analysis tool according to claim 3 or 4, characterized in that, One of the guide block and the sliding part is provided with a scale line, and the other is provided with a pointer pointing towards the scale line.

6. The automotive front-end parts assembly quality analysis tool according to claim 1, characterized in that, The other end of the second positioning pin is cylindrical, and the outer wall of the cylindrical shape is provided with a rectangular groove.

7. The automotive front-end parts assembly quality analysis tool according to claim 1, characterized in that, The X-direction positioning block includes two fixed positioning blocks symmetrically fixed at the upper end of the substrate in the Y direction and two adjustable positioning blocks symmetrically fixed at the lower end of the substrate in the Y direction; or an adjustable positioning block is provided at each of the four corners of the two end plate contouring modules.

8. The automotive front-end parts assembly quality analysis tool according to claim 1, characterized in that, The fixing frame includes a horizontal frame and two vertical frames, with the vertical frames vertically positioned at the bottom of the horizontal frame; The front hood contouring module includes a front hood contouring surface and a first bracket. The front hood contouring surface is disposed in the middle of the top surface of the horizontal frame via the first bracket. The fender contouring module includes a fender contouring surface and a second bracket. The fender contouring surface is disposed on the top surface and side surface of the horizontal frame via the second bracket. A first pad is disposed between the first bracket and the top surface of the horizontal frame. A second pad and a third pad are disposed between the second bracket and the top surface and side surface of the horizontal frame, respectively. The substrate is fixed to one side of the vertical frame by a second connecting plate; a handle is provided on the other side of the vertical frame.

9. A method of using an assembly quality analysis tool for automotive front-end parts, applied to the analysis tool described in any one of claims 1-8, characterized in that, Includes the following steps: Step 1: Place the analysis tool on the body-in-white frame and perform coarse positioning of the hood contouring module, fender contouring module, and end plate contouring module with the hood, fender, and front end plate, respectively. Step 2: Insert the positioning pins of the two end plate contouring modules into the positioning holes of the left and right front plates respectively to achieve the YZ direction limit of the first positioning pin and the Z direction limit of the second positioning pin; fit the X direction positioning surface of each X direction positioning block with the front plate and lock it with bolts. Step 3: Based on the quality defects of the front-end parts, determine the base plate part connected to the adjustable positioning block to be adjusted, its first direction of movement, and the adjustment amount L. Step 4: Move the base plate portion connected to the adjustable positioning block by a distance L along the first direction, adjust the posture of the front cover and left and right fenders, and fix them after matching with the front cover contouring module and the fender contouring module respectively. Step 5: After removing the tools, install the front-end component assembly onto the front-end plate; Step 6: Analyze the matching quality of the hood and fenders with adjacent parts; if the matching quality meets the requirements, proceed to step 7; if the matching quality does not meet the requirements, return to step 3 until the matching quality meets the requirements. Step 7: Adjust the end plate welding fixture so that the front end plate profile corresponding to the adjustable positioning block to be adjusted moves a distance L in the opposite direction of the first direction.

10. The method of use according to claim 9, characterized in that, The method of use also includes: analyzing the matching quality of the front cover and fender with adjacent parts; when the matching quality meets the requirements, locking the position of each adjustable positioning block; using the analysis tool as a tooling for the front cover and fender; and installing the front cover and fender on a vehicle with a defective front end panel.

11. A design method for an assembly quality analysis tool for automotive front-end parts, applied to the analysis tool described in any one of claims 1-8, characterized in that, Includes the following steps: Step 100: Extract the surface data of the front panel from the three-dimensional data of the whole vehicle. The surface data of the front panel includes the surface curve, the positioning hole outline, the square hole outline and the four corner threaded hole outlines. The extracted front panel surface data is stretched in the normal direction to form a first surface entity. The first surface entity includes the positioning hole through hole, the square hole through hole and the four corner through holes. Step 200: Select four X-direction rectangular regions on the first surface solid, including four corner through holes. The side length of the rectangular regions is set to 25-30mm, and the center of the rectangular regions is concentric with the corner through holes. Cut the side of the first surface solid near the front end plate to obtain four rectangular blocks and a first plane. Each rectangular block is perpendicular to the first plane. The X-direction thickness of each rectangular block is set to 5-10mm. The surface of each rectangular block that fits against the front end plate surface forms an X-direction positioning surface. Step 300: Cut off the first surface solid part connected to the rectangular block corresponding to the adjustable positioning block, obtain the second surface solid, separate the second surface solid from the rectangular block corresponding to the adjustable positioning block, and set the positioning part and sliding part based on the X-direction positioning surface of the rectangular block corresponding to the adjustable positioning block to obtain the adjustment block. Step 400: Cut the side of the second surface entity away from the front end plate into a second plane to obtain the substrate; set the guide block and locking mechanism according to the adjustment block and the substrate to obtain the adjustable positioning block, thereby obtaining the end plate contouring module; Step 500: After reducing the radius of the positioning hole outline on the substrate by 0.05-0.2mm, stretch it normally to both sides. The positioning pin on the side closer to the front plate extends into the positioning hole of the front plate, obtains the positioning pin data, and sets the positioning pin of one positioning pin as a diamond pin. Step 600: Extract the front edge data of the hood and the fender evaluation surface, and stretch the extracted data with a 3-5mm gap to form the hood contour surface and the fender contour surface; Step 700: Based on the front hood contour surface, fender contour surface, and end plate contour module, set up a horizontal frame, two vertical frames, a first bracket, a second bracket, and a second connecting plate, so that the front hood contour surface is connected to the middle of the top surface of the horizontal frame through the first bracket, the fender contour surface is connected to the top and side surfaces of the horizontal frame through the second bracket, and the end plate contour module is connected to one side of the vertical frame through the second connecting plate.

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