Automobile front end part assembly quality analysis tool, use method and design method

Abstract

The invention discloses an automobile front end part assembly quality analysis tool, a use method and a design method.The analysis tool comprises a fixing frame, and a front cover profiling module is arranged in the middle of the fixing frame and used for installing a front cover; fender profiling modules are arranged on the two sides of the front cover profiling module in the Y direction and used for installing fenders; end plate profiling modules are arranged on the two sides of the bottom of the fixing frame in the Y direction, each end plate profiling module comprises a base plate, a plurality of X-direction positioning blocks are arranged on each base plate, and each X-direction positioning block comprises an X-direction positioning face; at least one X-direction positioning block is arranged to be an adjustable positioning block, and the X-direction positioning face of the adjustable positioning block can move in the X direction. The method has the advantages that the key dimension point of the front end plate can be quickly identified, the key dimension of the front end plate is optimized and debugged, the front end appearance quality problem is solved, and the problem solving efficiency is improved; unnecessary temporary adjusting tools and adjusting processes in the whole vehicle manufacturing process are reduced, and the whole vehicle manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile assembly, in particular to an automobile front end parts assembly quality analysis tool, a use method and a design method. Background Art

[0002] During the manufacturing process of automobiles, the front cover, fender, front longitudinal beam of the vehicle body, front end plate, frame, headlamp, front guide, front insurance and other parts constitute the front end of the vehicle; the manufacturing process requires the installation of the front end plate, longitudinal beam, fender, front cover and other pre-order sheet metal parts first; the front end plate, as an important positioning part of the front end, plays a very important role in the overall visual effect of the gap and flush fit of the front cover, headlamp and bumper. The conventional means of assembly quality analysis is to analyze the assembly relationship and compare the parts measurement report. The analysis process is long and can only be inferred but not actually verified. Moreover, this method cannot identify the key size influencing points of the positioning parts, and cannot analyze the degree of influence of the translation and rotation changes of the key size of the front end plate positioning parts on the front end appearance quality defects.

[0003] In the process of analyzing and optimizing the quality problems of the front end of vehicle manufacturing, the assembly dimension chain of the front end of the vehicle is long, and the overlapping assembly positioning relationship of the parts is complex. In order to accurately analyze the influence of the translation and rotation changes of the key dimensions of the front end panel on the appearance quality of the front end of the vehicle, it is necessary to design a tool for analyzing the quality problems of the front end of the vehicle based on the structure and process characteristics of the whole vehicle. By analyzing the influence of the translation and rotation changes of the key dimensions of the front end panel on the external gaps and flush defects of the front end, the simulation analysis function is realized. Summary of the invention

[0004] In order to solve at least one of the above technical problems, the present invention provides an automobile front-end parts assembly quality analysis tool, a usage method and a design method. The analysis tool is provided with an end plate profiling module, which includes a substrate, on which an adjustable positioning block is provided. Moving the substrate portion connected to the adjustable positioning block along the X-direction can simulate the changes in translation and rotation of the 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 automobile front-end parts comprises a fixing frame, wherein a front cover profiling module is arranged in the middle of the fixing frame for installing the front cover; fender profiling modules are arranged on both sides of the front cover profiling module in the Y direction for installing the fender; end plate profiling modules are arranged on both sides of the bottom of the fixing frame in the Y direction, each of the end plate profiling modules comprises a base plate, a plurality of X-direction positioning blocks are arranged on the base plate, and each of the X-direction positioning blocks comprises an X-direction positioning surface; at least one X-direction positioning block is arranged 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 adjustment block and a locking mechanism, the guide block is fixedly arranged on one side of the base plate, and a slide groove extending along the X direction is arranged at the bottom of the guide block; 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 with the slide groove; the locking mechanism can lock the relative position of the slide rail and the slide groove; preferably, the slide groove and the slide rail are both arranged to be trapezoidal, and the upper base length of the trapezoid is greater than the lower base length.

[0008] Furthermore, the locking mechanism includes a top screw, and the side wall of the slide groove is provided with a first threaded hole extending along the Y direction, and the top screw passes through the first threaded hole.

[0009] Furthermore, the locking mechanism includes a first connecting plate and a screw, the first connecting plate is fixedly arranged on the guide block; the sliding part is provided with a second threaded hole extending along 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 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 facing the scale line, so as to facilitate the 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, and the positioning pin is adapted to the positioning hole of the front end plate; the positioning pin of an end plate profiling module is set as a first positioning pin, and the positioning column of the first positioning pin is set as a circular pin; the positioning pin of another end plate profiling module is set as a second positioning pin, and the positioning column of the second positioning pin is set as a diamond pin, and the upper and lower ends of the diamond pin are set as circular 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, and the outer wall of the cylinder is provided with a rectangular groove; preferably, the X-direction positioning block includes two fixed positioning blocks symmetrically fixedly arranged at the upper end of the substrate in the Y-direction and two adjustable positioning blocks symmetrically arranged at the lower end of the substrate in the Y-direction; or an adjustable positioning block is set at the four corners of the two end plate profiling modules.

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

[0013] The front cover profiling module comprises a front cover profiling surface and a first bracket, wherein the front cover profiling surface is arranged at the middle of the top surface of the horizontal frame through the first bracket; the fender profiling module comprises a fender profiling surface and a second bracket, wherein the fender profiling surface is arranged at the top surface and the side surface of the horizontal frame through the second bracket; a first pad is arranged between the first bracket and the top surface of the horizontal frame; a second pad and a third pad are arranged between the second bracket and the top surface and the side surface of the horizontal frame respectively;

[0014] The base plate is fixedly arranged on one side of the vertical frame through a second connecting plate; a handle is arranged on the other side of the vertical frame.

[0015] Furthermore, a method for using an automobile front-end parts assembly quality analysis tool, applied to the above-mentioned analysis tool, comprises the following steps:

[0016] Step 1: placing the analysis tool on the body-in-white frame, and roughly positioning the front cover profiling module, the fender profiling module and the end plate profiling module with the front cover, the fender and the front end plate respectively;

[0017] Step 2: insert the positioning pins of the two end plate profiling modules into the positioning holes of the left and right front end plates respectively to limit the first positioning pin in the YZ direction and the second positioning pin in the Z direction; fit the X-direction positioning surface of each X-direction positioning block to the front end plate and tighten them with bolts;

[0018] Step 3, according to the matching quality defects of the front-end parts, determine the base plate portion connected to the adjustable positioning block to be adjusted, its first direction to be moved and the adjustment amount L;

[0019] Step 4, moving the base plate portion connected to the adjustable positioning block to be adjusted by a distance L along the first direction, adjusting the postures of the front cover and the left and right fenders, and matching and fixing them with the front cover profiling module and the fender profiling module respectively;

[0020] Step 5: After removing the tool, install the front end parts assembly on the front end plate;

[0021] Step 6: Analyze the matching quality of the front cover and fender 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 to move the front end plate profile corresponding to the adjustable positioning block to be adjusted by 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, and 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.

[0024] Furthermore, a design method of an automobile front-end parts assembly quality analysis tool is applied to the above-mentioned analysis tool, comprising the following steps:

[0025] Step 100, extracting the profile data of the front end panel through the three-dimensional data of the whole vehicle, the profile data of the front end panel including the profile curved surface, the positioning hole contour line, the square hole contour line and the four corner threaded hole contour lines of the front end panel, and stretching the extracted front end panel profile data in the normal direction to form a first profile entity, the first profile entity including the positioning hole through hole, the square hole through hole and the four corner through holes;

[0026] Step 200, select four X-direction rectangular areas including four corner through holes on the first profile entity, the side length of the rectangular area is set to 25-30 mm, and the center of the rectangular area is concentric with the corner through hole; cut the first profile entity on the side close to 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 5-10 mm, and each rectangular block is attached to the surface of the front end plate to form an X-direction positioning surface;

[0027] Step 300, cut off the first profile entity portion connected to the rectangular block corresponding to the adjustable positioning block, obtain the second profile entity, separate the second profile entity from the rectangular block corresponding to the adjustable positioning block, set the positioning part and the sliding part based on the X-direction positioning surface of the rectangular block corresponding to the adjustable positioning block, and obtain the adjustment block;

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

[0029] Step 500: Reduce the radius of the contour line of the positioning hole on the substrate by 0.05-0.2 mm and stretch it normally to both sides, so that the positioning column close to the front end plate is inserted into the positioning hole of the front end plate, obtain the positioning pin data, and set the positioning column of one positioning pin to a diamond pin;

[0030] Step 600, extracting the front edge of the front cover and the fender evaluation surface data, and stretching the extracted data by 3-5 mm to form the front cover profiling surface and the fender profiling surface;

[0031] Step 700, set a horizontal frame, two vertical frames, a first bracket, a second bracket and a second connecting plate according to the front cover profiling surface, the fender profiling surface and the end plate profiling module, so that the front cover profiling surface is connected to the middle of the top surface of the horizontal frame through the first bracket, the fender profiling surface is connected to the top surface and the side surface of the horizontal frame through the second bracket, and the end plate profiling module is connected to one side of the vertical frame through the second connecting plate.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) This analysis tool can realize spatial translation and rotation of the substrate by moving the substrate part connected to the adjustable positioning block along the X direction. It can also adjust the position of the fixing frame, that is, adjust the position of the front cover profiling module and the fender profiling module, thereby adjusting the relative position of the front cover, fender and front end panel, and simulate the spatial translation and rotation of the key dimensions of the front end panel. It can easily analyze the impact of the changes in the translation and rotation of the key dimensions of the front end panel 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 reversely verify the adjustment amount of the key dimension points of the front end panel by reserving, so as to realize rapid adjustment analysis.

[0034] (2) It can quickly and accurately identify the key dimension points of the front-end panel, optimize and debug the key dimensions of the front-end panel, solve the front-end appearance quality problems, improve the front-end aesthetics of the product, and improve the consistency of the gap, thereby enhancing product competitiveness; reduce the time for dimensional defect analysis and optimization, and improve problem solving efficiency; at the same time, reduce unnecessary temporary adjustment tools and adjustment processes in the vehicle manufacturing process, and reduce the rework cost and vehicle manufacturing cost.

[0035] (3) The analysis tool can be used as a tool for the front cover and fenders. The front cover and fenders can be installed on vehicles with defective front end panels to ensure that the assembly quality of the various parts of the front end of the vehicle meets the requirements, thereby reducing the number of defective vehicles and the frequency of repairs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0037] Figure 1 It is a schematic diagram of the structure of the automobile front end parts assembly quality analysis tool of the present invention.

[0038] Figure 2 It is a side view structural schematic diagram of the automobile front end parts assembly quality analysis tool of the present invention.

[0039] Figure 3 It is a schematic diagram of the back view structure of the automobile front end parts assembly quality analysis tool of the present invention.

[0040] Figure 4 It is a schematic diagram of the structure of an enlarged view of the first embodiment A of the present invention.

[0041] Figure 5 It is a schematic diagram of the structure of an enlarged view of the second embodiment A of the present invention.

[0042] Figure 6It is a schematic diagram of the enlarged structure of B of the present invention.

[0043] Figure 7 It is a schematic diagram of the structure of an enlarged view of C of the present invention.

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

[0045] In the figure: 10-fixed frame; 11-horizontal frame; 12-vertical frame; 13-handle; 20-front cover profiling module; 21-front cover profiling surface; 22-first bracket; 30-fender profiling module; 31-fender profiling surface; 32-second bracket; 40-end plate profiling 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-top 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 DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0047] In the description of the present invention, it should be noted that the term "including" and its variations represent open inclusion, that is, "including but not limited to". The terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. In addition, in the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The directions "X", "Y", and "Z" are the directions of the vehicle coordinate system, with the vehicle's driving direction as the X direction, the direction from the driver's side to the co-pilot side as the Y direction, and the vehicle height direction as the Z direction.

[0048] The present invention provides a tool for analyzing the assembly quality of automobile front-end parts. Figure 1-Figure 7As shown, it includes a fixing frame 10, a front cover profiling module 20 is arranged in the middle of the fixing frame 10 for installing the front cover 50; fender profiling modules 30 are arranged on both sides of the Y direction of the front cover profiling module 20 for installing the fender 60; end plate profiling modules 40 are arranged on both sides of the Y direction of the bottom of the fixing frame 10, each of the end plate profiling modules 40 includes a base plate 41, a plurality of X-direction positioning blocks are arranged on the base plate 41, and each of the X-direction positioning blocks includes an X-direction positioning surface 4222a; at least one X-direction positioning block is arranged 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 profiling module 20 is arranged in the middle of the fixing frame 10, and is used to match the front edge of the front cover 50 when the front cover 50 is installed. The fender profiling module 30 and the end plate profiling 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 profiling module 30 is located on both sides of the front cover profiling 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 profiling module 40 is used to match the profile of the front end plate 70, and the X-direction positioning surface 4222a of the adjustable positioning block 42 can move along the X direction, that is, the part of the substrate 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 size points of the front end plate 70, for example, each X-direction positioning block can be set at the four corners of the substrate 41, and the adjustable positioning block 42 can be set to two, three, four, etc.

[0050] refer to Figure 8As shown, when the tool is used, the front end plate 70 of the vehicle is fixed, the X-direction positioning surface 4222a of each X-direction positioning block is fitted to the profile of the front end plate 70, and the part of the base plate 41 connected to the adjustable positioning block 42 is moved along the X direction, so that the position of the fixing frame 10 can be adjusted, that is, the position of the front cover profiling module 20 and the fender profiling module 30 can be adjusted, thereby adjusting the relative position of the front cover 50, the fender 60 and the front end plate 70. When the parts of the base plate 41 connected to each adjustable positioning block 42 move the same distance along the X direction, the spatial translation of the base plate 41 can be achieved, and when the parts of the base plate 41 connected to each adjustable positioning block 42 move different distances along the X direction, the spatial rotation of the base plate 41 can be achieved. The front end panel 70 remains fixed, and the positions of the front cover 50 and the fender 60 are adjusted by moving the substrate 41 connected to the adjustable positioning block 42, which is equivalent to keeping the front cover 50 and the fender 60 fixed. The position of the front end panel 70 is adjusted in reverse, so that the relative positions of the front cover 50, the fender 60 and the front end panel 70 of the two adjustment methods can be consistent, that is, the key dimensions of the front end panel 70 can be simulated for spatial translation and rotation, so that by adjusting the substrate 41 connected to the adjustable positioning block 42, the influence of the changes in the translation and rotation of the key dimensions of the front end panel 70 on the front end external gap and flush defects can be analyzed, thereby 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 adjustment block 422 and a locking mechanism. The guide block 421 is fixedly arranged on one side of the base plate 41, and a slide groove extending along the X direction is arranged at the bottom of the guide block 421; the adjustment block 422 includes a sliding portion 4221 and a positioning portion 4222, and the sliding portion 4221 is provided with a slide rail 4221a adapted to the slide groove, and the slide rail 4221a is slidably connected with the slide groove; the locking mechanism can lock the relative position of the slide rail 4221a and the slide groove. The slide groove moves along the slide rail 4221a to adjust the X-direction position of the guide block 421, and the guide block 421 is fixedly arranged on the base plate 41, which can drive the base plate 41 part connected to the guide block 421 to move. When the base plate 41 part connected to the guide block 421 moves into place, it can be locked using the locking mechanism.

[0052] Preferably, the slide groove and the slide rail 4221a are both set to be trapezoidal, and the upper base length of the trapezoid is greater than the lower base length. The slide groove and the slide rail 4221a are wide at the top and narrow at the bottom, which can prevent the adjustment block 422 from falling from the slide groove.

[0053] In one embodiment, Figure 4As shown, the locking mechanism includes a top screw 43, and the side wall of the slide groove is provided with a first threaded hole extending along the Y direction, and the top screw 43 passes through the first threaded hole. After the slide groove is moved to the required X-direction position along the slide rail 4221a, the top screw 43 is tightened, and the top screw 43 presses against the slide rail 4221a, that is, the relative position of the slide rail 4221a and the slide groove is locked. In order to lock firmly, multiple top screws 43 can be provided.

[0054] In one embodiment, Figure 5 As shown, the locking mechanism includes a first connecting plate 44 and a screw 45, the first connecting plate 44 is fixedly arranged on the guide block 421; the sliding portion 4221 is provided with a second threaded hole extending along 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 respectively 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 vertically connected to the horizontal plate, and the two vertical plates are respectively located at the two ends of the horizontal plate in the X direction. The upper vertical plate of the first connecting plate 44 can be fixedly connected with the guide block 421, and 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 to block 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 transmission. When the X-direction positioning surface 4222a of the adjustment block 422 is fixed, the screw 45 can drive the guide block 421 to move in the X direction when it rotates, that is, adjust the relative position of the guide block 421 and the adjustment block 422 in the X direction. The X-direction position of the guide block 421 can be accurately adjusted by the screw 45, and the relative position of the slide rail 4221a and the slide groove is locked when the screw 45 stops rotating.

[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 facing the scale line. The distance that the guide block 421 moves along the X direction can be accurately adjusted by the scale line and the pointer, so as to conveniently control the adjustment amount of the guide block 421 in the X direction. The adjustment amount of the base plate 41 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 base plates 41 is provided with a positioning pin extending along the X direction, and the positioning pin is matched with the positioning hole of the front end plate 70. Figure 6 As shown, the positioning pin of an end plate profiling module 40 is set as a first positioning pin 46, and the positioning column of the first positioning pin 46 is set as a round pin; Figure 7 As shown, the locating pin of another end plate profiling module 40 is set as a second locating pin 47, the locating column of the second locating pin 47 is set as a diamond pin, and the upper and lower ends of the diamond pin are set as arcs that match the locating hole of the front end plate 70.

[0058] When the end plate profiling 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 column of the first positioning pin 46 is set as a round pin, which can position the front end plate 70 assembled therewith in the Y and Z directions, and the positioning column of the second positioning pin 47 is set as a diamond pin, which can position the front end plate 70 assembled therewith in the Z direction. When there is a dimensional deviation in the Y-direction spacing between the two positioning pins or the front end plate 70, due to the large gap between the Y-direction side wall of the diamond positioning pin and the positioning hole 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, so as to facilitate the installation of the analysis tool on the two front end plates 70.

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

[0060] In order to prevent over-positioning, one end plate profiling module 40 is provided with a positioning pin, which is matched with the upper positioning hole or the lower positioning hole of the front end plate 70. Preferably, the positioning pins of the two end plate profiling modules 40 are matched with the upper positioning holes of the front end plate 70. The X-direction positioning blocks include two fixed positioning blocks 48 fixedly arranged at the upper end of the base plate 41 in a Y-direction symmetrical manner and two adjustable positioning blocks 42 arranged at the lower end of the base plate 41 in a Y-direction symmetrical manner; or an adjustable positioning block 42 is arranged at each of the four corners of the two end plate profiling modules 40.

[0061] In one embodiment, reference Figure 1-Figure 3As shown, the fixing frame 10 includes a horizontal frame 11 and two vertical frames 12, and the vertical frame 12 is vertically arranged at the bottom of the horizontal frame 11. The front cover profiling module 20 includes a front cover profiling surface 21 and a first bracket 22, and the front cover profiling surface 21 is arranged at the middle of the top surface of the horizontal frame 11 through the first bracket 22; the fender profiling module 30 includes a fender profiling surface 31 and a second bracket 32, and the fender profiling surface 31 is arranged on the top surface and side surface of the horizontal frame 11 through the second bracket 32. Preferably, a first pad is arranged between the first bracket 22 and the top surface of the horizontal frame 11; a second pad and a third pad are arranged between the second bracket 32 ​​and the top surface and side surface of the horizontal frame 11, respectively. The Z direction of the front cover profiling surface 21 can be adjusted by the first pad, and the Z direction and Y direction of the fender profiling surface 31 can be adjusted by the second pad and the third pad, respectively. For example, a plurality of pads of different specifications can be arranged to achieve an adjustment amount of 1-5mm. The base plate 41 is fixedly arranged on one side of the vertical frame 12 through the second connecting plate 49; a handle 13 is arranged on the other side of the vertical frame 12. The handles 13 arranged on the two vertical frames 12 can facilitate the picking up and carrying of the tool. The analysis tool can be made of carbon fiber material, which is more lightweight and durable, reduces the load on the operator, and conforms to ergonomics.

[0062] The present invention also provides a method for using a tool for analyzing the assembly quality of automobile front-end parts, which is applied to the above-mentioned analysis tool and comprises the following steps:

[0063] Step 1: placing the analysis tool on the body-in-white frame, and roughly positioning the front cover profiling module 20, the fender profiling module 30 and the end plate profiling module 40 with the front cover 50, the fender 60 and the front end plate 70 respectively;

[0064] Step 2: insert the positioning pins of the two end plate profiling modules 40 into the positioning holes of the left and right front end plates 70 respectively to limit the first positioning pin 46 in the YZ direction and the second positioning pin 47 in the Z direction; fit the X-direction positioning surface 4222a of each X-direction positioning block to the front end plate 70 and tighten them with bolts 410;

[0065] Step 3, according to the matching quality defects of the front-end parts, determine the part of the substrate 41 connected to the adjustable positioning block 42 to be adjusted, its first direction to be moved and the adjustment amount L;

[0066] Step 4, move the portion of the base plate 41 connected to the adjustable positioning block 42 to be adjusted along the first direction by a distance L, adjust the postures of the front cover 50 and the left and right fenders 60, and match and fix them with the front cover profiling module 20 and the fender profiling module 30 respectively;

[0067] Step 5: After removing the tool, install the front end parts assembly on the front end plate 70;

[0068] Step 6, analyzing the matching quality of the front cover 50 and the fender 60 with the adjacent parts; if the matching quality meets the requirements, executing step 7; if the matching quality does not meet the requirements, returning to step 3 until the matching quality meets the requirements;

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

[0070] There is a through hole in the middle of the X-axis positioning block. In step 2, the X-axis positioning surface 4222a of each X-axis positioning block is fitted to the front end plate 70 and fixed with bolts 410 to ensure the initial position of the analysis tool is accurate and the scale mark pointed to by the pointer at this time can be recorded.

[0071] In step 3, multiple position data of the front end plate 70 corresponding to the adjustable part of the end plate welding fixture can be measured, and the dimension point with a large deviation between the measured value and the design value can be used as the key dimension point of the front end plate 70 to be adjusted, and the opposite direction of the deviation direction can be used as the adjustment direction of the analysis tool. The gap and flush state of each area to be evaluated can also be measured, and verification and adjustment can be performed based on the gap and flush. For example, the gap between the headlight and the fender 60 is large, and the gap between the front cover 50 and the front guard is large. Assuming that the Z-direction posture of the fender 60 needs to be rotated upward and backward for verification, the forward direction along the X direction is used as the first direction, and the part of the substrate 41 connected to the adjustable positioning block 42 is adjusted forward. The adjustment amount can be 1mm as the starting value. If the defective state is improved, 0.5mm is used as the incremental value to continue verification, and the moving distance L is 1mm, 1.5mm or 2mm, etc., until the defect of the large gap between the headlight and the fender 60, and the front cover 50 and the front guard is improved and eliminated. If the gap becomes larger after adjustment along the forward direction of the X direction, the verification is adjusted in the reverse direction.

[0072] In step 4, the parts of the substrate 41 connected to the adjustable positioning block 42 corresponding to the key size points of the front end plate 70 can be translated in the X direction at the same time to achieve the reservation of the assembly posture of the fender 60, the front cover 50 and other parts. When the part of the substrate 41 connected to the adjustable positioning block 42 to be adjusted is moved along the first direction by rotating the screw 45 by a distance L, when the X-direction positioning block has a fixed positioning block 48, and the fixed positioning block 48 has been fixed to the front end plate 70 by the bolt 410 in step 2, the bolt 410 can be loosened first, and the part of the substrate 41 connected to the adjustable positioning block 42 can be adjusted to the right position before tightening the bolt 410. The front cover 50 and the fender 60 are not fixed initially, and the posture can be adjusted. During the posture adjustment process, the gap and flush state between the front cover 50 and the front cover profiling module 20, and the fender 60 and the fender profiling module 30 can be determined by using a feeler gauge and a flush gauge, and the adjustment is fixed after the matching is in place.

[0073] After removing the tool and installing the front-end parts assembly on the front-end plate 70, the front-end parts are assembled in place, and the matching quality of the front cover 50 and the fender 60 with the adjacent parts can be analyzed, and the influence of the change of the key dimension points of the front-end plate 70 on the dimensions of the contouring area of ​​the front cover 50, the fender 60 and other parts can be analyzed, so as to realize the functional analysis and simulation of the translation or rotation posture of the front-end plate 70 parts. For example, the gap and flush state of the adjacent parts 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 eyebrow are analyzed. If the matching quality of each place meets the requirements, it means that the distance L of the part of the substrate 41 connected to the adjustable positioning block 42 to be adjusted along the first direction is appropriate, that is, the reverse reserve of the front-end plate 70 is appropriate, then the key dimension point adjustment data is recorded, and the reserved dimension state of the front-end plate 70 is locked. Then, step 7 is performed to adjust the end plate welding fixture so that the profile of the front end plate 70 corresponding to the adjusted adjustable positioning block 42 moves a distance L in the opposite direction of the first direction. When assembling the front end plate 70, batch adjustment can be performed to optimize the key dimensional points of the front end plate 70 parts, complete the problem analysis and adjustment, and fundamentally solve the dimensional problem. If the matching quality does not meet the requirements, the various parts can be disassembled, and after loosening the front cover 50 and the fender 60, the base plate 41 connected to the adjustable positioning block 42 can be re-adjusted until the matching quality meets the requirements.

[0074] This method of use can standardize dimension simulation analysis and reservation analysis, and can perform dimension reservation or dimension function simulation more quickly, thereby improving the efficiency of solving quality problems and reducing vehicle manufacturing costs.

[0075] The method of use also includes: analyzing the matching quality of the front cover 50 and the fender 60 with adjacent parts, and 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 the fender 60, and installing the front cover 50 and the fender 60 on a vehicle with a defective front end panel 70.

[0076] When assembling the front cover 50 and the fender 60, the positioning pins of the two end plate profiling modules 40 are respectively inserted into the positioning holes of the left and right front end plates 70 to realize the YZ direction limit of the first positioning pin 46 and the Z direction limit of the second positioning pin 47; the X-direction positioning surfaces 4222a of the locked X-direction positioning blocks are fitted with the front end plate 70; the postures of the front cover 50 and the left and right fenders 60 are adjusted, and they are matched with the front cover profiling module 20 and the fender profiling module 30 respectively and then fixed, so as to realize the assembly of the front cover 50 and the fender 60. At this time, although the front end plate 70 has deviations, the assembly quality of each part of the front end of the vehicle meets the requirements, which can reduce the number of defective vehicles and reduce the frequency of repairs.

[0077] When the analysis tool is used, the analysis tool can be taken by the handle 13. Before use, the components can be visually checked for integrity and damage to ensure the accuracy of adjustment.

[0078] The present invention also provides a design method for an automobile front-end parts assembly quality analysis tool, which is applied to the above-mentioned analysis tool, referring to Figure 8 As shown, the following steps are included:

[0079] Step 100, extracting the profile data of the front end plate 70 through the three-dimensional data of the whole vehicle, wherein the profile data of the front end plate 70 includes a profile curved surface, a positioning hole contour line, a square hole contour line, and four corner threaded hole contour lines of the front end plate 70, and stretching the extracted profile data of the front end plate 70 in a normal direction to form a first profile entity, wherein the first profile entity includes a positioning hole through hole, a square hole through hole, and four corner through holes;

[0080] Step 200, select four X-direction rectangular areas including four corner through holes on the first profile entity, the side length of the rectangular area is set to 25-30 mm, and the center of the rectangular area is concentric with the corner through hole; cut the first profile entity on the side 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 5-10 mm, and each rectangular block is attached to the surface of the front end plate 70 to form an X-direction positioning surface 4222a;

[0081] Step 300, cut off the first profile entity portion connected to the rectangular block corresponding to the adjustable positioning block 42, obtain the second profile entity, separate the second profile entity from the rectangular block corresponding to the adjustable positioning block 42, set the positioning portion 4222 and the sliding portion 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, cutting the side of the second profile entity away from the front end plate 70 into a second plane to obtain a base plate 41; setting a guide block 421 and a locking mechanism according to the adjustment block 422 and the base plate 41 to obtain an adjustable positioning block 42, thereby obtaining an end plate profiling module 40;

[0083] Step 500: Reduce the radius of the positioning hole contour line on the substrate 41 by 0.05-0.2 mm and stretch it normally to both sides, so that the positioning post on the side close to the front end plate 70 extends into the positioning hole of the front end plate 70, obtain the positioning pin data, and set the positioning post of one positioning pin to a diamond pin;

[0084] Step 600, extracting the evaluation surface data of the front edge of the front cover 50 and the fender 60, and stretching the extracted data by 3-5 mm to form the front cover profiling surface 21 and the fender profiling surface 31; the front cover profiling surface 21 and the fender profiling surface 31 may adopt a segmented design structure;

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

[0086] The profile of the front end panel 70 is in a curved state or a flat state, and accordingly, the extracted profile curve of the front end panel 70 includes a curved state or a flat state. The analysis tool can be designed quickly and easily using CATIA, Solidworks and other software through the three-dimensional data of the vehicle front end panel 70, the front cover 50 and the fender 60. The design process is simplified, and the analysis tool can be customized according to the analysis requirements and functional simulation requirements, forming a guide for problem analysis and size optimization, saving a lot of time and cost, improving design efficiency and reducing error rate, improving the efficiency of solving front-end quality problems, and reducing 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tool for analyzing the assembly quality of automobile front-end parts, characterized in that: It comprises a fixing frame, wherein a front cover profiling module is arranged in the middle of the fixing frame for installing the front cover; fender profiling modules are arranged on both sides of the Y direction of the front cover profiling module for installing the fender; end plate profiling modules are arranged on both sides of the Y direction of the bottom of the fixing frame, each of the end plate profiling modules comprises a base plate, a plurality of X-direction positioning blocks are arranged on the base plate, and each of the X-direction positioning blocks comprises an X-direction positioning surface; at least one X-direction positioning block is arranged as an adjustable positioning block, and the X-direction positioning surface of the adjustable positioning block can move along the X direction.

2. The automobile front end parts assembly quality analysis tool according to claim 1, characterized in that: The adjustable positioning block includes a guide block, an adjustment block and a locking mechanism. The guide block is fixedly arranged on one side of the base plate, and a slide groove extending along the X direction is arranged at the bottom of the guide block; the adjustment block includes a sliding part and a positioning part, and the sliding part is provided with a slide rail adapted to the slide groove, and the slide rail is slidably connected with the slide groove; the locking mechanism can lock the relative position of the slide rail and the slide groove; preferably, the slide groove and the slide rail are both arranged to be trapezoidal, and the upper base length of the trapezoid is greater than the lower base length.

3. The automobile front end parts assembly quality analysis tool according to claim 2, characterized in that: The locking mechanism comprises a top screw, and the side wall of the slide groove is provided with a first threaded hole extending along the Y direction, and the top screw passes through the first threaded hole.

4. The automobile front end parts assembly quality analysis tool according to claim 2, characterized in that: The locking mechanism includes a first connecting plate and a screw, the first connecting plate is fixedly arranged on the guide block; the sliding part is provided with a second threaded hole extending along 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 respectively located on both sides of the first connecting plate.

5. The automobile front end parts assembly quality analysis tool according to claim 2, 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 facing the scale line.

6. The automobile front end parts assembly quality analysis tool according to claim 1, characterized in that: Each of the substrates is provided with a locating pin extending along the X direction, and the locating pin is adapted to the locating hole of the front end plate; the locating pin of one end plate profiling module is set as a first locating pin, and the locating column of the first locating pin is set as a circular pin; the locating pin of the other end plate profiling module is set as a second locating pin, and the locating column of the second locating pin is set as a diamond pin, and the upper and lower ends of the diamond pin are set as circular arcs adapted to the locating hole of the front end plate; preferably, the other end of the second locating pin is set as a cylinder, and the outer wall of the cylinder is provided with a rectangular groove; preferably, the X-direction positioning block includes two fixed positioning blocks symmetrically fixedly arranged at the upper end of the substrate in the Y direction and two adjustable positioning blocks symmetrically arranged at the lower end of the substrate in the Y direction; or an adjustable positioning block is provided at the four corners of the two end plate profiling modules.

7. The automobile front end parts assembly quality analysis tool according to claim 1, characterized in that: The fixing frame comprises a horizontal frame and two vertical frames, wherein the vertical frames are vertically arranged at the bottom of the horizontal frame; The front cover profiling module comprises a front cover profiling surface and a first bracket, wherein the front cover profiling surface is arranged at the middle of the top surface of the horizontal frame through the first bracket; the fender profiling module comprises a fender profiling surface and a second bracket, wherein the fender profiling surface is arranged at the top surface and the side surface of the horizontal frame through the second bracket; a first pad is arranged between the first bracket and the top surface of the horizontal frame; a second pad and a third pad are arranged between the second bracket and the top surface and the side surface of the horizontal frame respectively; The base plate is fixedly arranged on one side of the vertical frame through a second connecting plate; a handle is arranged on the other side of the vertical frame.

8. A method for using an automobile front-end parts assembly quality analysis tool, applied to the analysis tool according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: placing the analysis tool on the body-in-white frame, and roughly positioning the front cover profiling module, the fender profiling module and the end plate profiling module with the front cover, the fender and the front end plate respectively; Step 2: insert the positioning pins of the two end plate profiling modules into the positioning holes of the left and right front end plates respectively to limit the first positioning pin in the YZ direction and the second positioning pin in the Z direction; fit the X-direction positioning surface of each X-direction positioning block to the front end plate and tighten them with bolts; Step 3, according to the matching quality defects of the front-end parts, determine the base plate portion connected to the adjustable positioning block to be adjusted, its first direction to be moved and the adjustment amount L; Step 4, moving the base plate portion connected to the adjustable positioning block to be adjusted by a distance L along the first direction, adjusting the postures of the front cover and the left and right fenders, and matching and fixing them with the front cover profiling module and the fender profiling module respectively; Step 5: After removing the tool, install the front end parts assembly on the front end plate; Step 6: Analyze the matching quality of the front cover and fender 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 to move the front end plate profile corresponding to the adjustable positioning block to be adjusted by a distance L in the opposite direction of the first direction.

9. The method of use according to claim 8, characterized in that: The method of use also includes: analyzing the matching quality of the front cover and fender with adjacent parts, and 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.

10. A design method for an automobile front-end parts assembly quality analysis tool, applied to the analysis tool according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 100, extracting the profile data of the front end panel through the three-dimensional data of the whole vehicle, the profile data of the front end panel including the profile curved surface, the positioning hole contour line, the square hole contour line and the four corner threaded hole contour lines of the front end panel, and stretching the extracted front end panel profile data in the normal direction to form a first profile entity, the first profile entity including the positioning hole through hole, the square hole through hole and the four corner through holes; Step 200, select four X-direction rectangular areas including four corner through holes on the first profile entity, the side length of the rectangular area is set to 25-30 mm, and the center of the rectangular area is concentric with the corner through hole; cut the first profile entity on the side close to 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 5-10 mm, and each rectangular block is attached to the surface of the front end plate to form an X-direction positioning surface; Step 300, cut off the first profile entity portion connected to the rectangular block corresponding to the adjustable positioning block, obtain the second profile entity, separate the second profile entity from the rectangular block corresponding to the adjustable positioning block, set the positioning part and the sliding part based on the X-direction positioning surface of the rectangular block corresponding to the adjustable positioning block, and obtain the adjustment block; Step 400: Cut the side of the second profile entity away from the front end plate into a second plane to obtain a base plate; set a guide block and a locking mechanism according to the adjustment block and the base plate to obtain an adjustable positioning block, thereby obtaining an end plate profiling module; Step 500: Reduce the radius of the contour line of the positioning hole on the substrate by 0.05-0.2 mm and stretch it normally to both sides, so that the positioning column close to the front end plate is inserted into the positioning hole of the front end plate, obtain the positioning pin data, and set the positioning column of one positioning pin to a diamond pin; Step 600, extracting the front edge of the front cover and the fender evaluation surface data, and stretching the extracted data by 3-5 mm to form the front cover profiling surface and the fender profiling surface; Step 700, set a horizontal frame, two vertical frames, a first bracket, a second bracket and a second connecting plate according to the front cover profiling surface, the fender profiling surface and the end plate profiling module, so that the front cover profiling surface is connected to the middle of the top surface of the horizontal frame through the first bracket, the fender profiling surface is connected to the top surface and the side surface of the horizontal frame through the second bracket, and the end plate profiling module is connected to one side of the vertical frame through the second connecting plate.

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