Adjustable front end frame and automobile front face assembly method

Abstract

The present invention relates to an adjustable front-end frame and a method for assembling the front face of an automobile, comprising a front-end frame middle section, wherein slide grooves are symmetrically provided on the left and right sides of the front-end frame middle section, wherein sliders are slidably connected in the slide grooves, and adjustment mechanisms for adjusting the sliding positions of corresponding sliders are provided on the slide grooves, and the sliders on the left and right sides are detachably connected to the left and right sections of the front-end frame, respectively; when the front-end frame is assembled, the Y direction is self-positioned by integrating the Z direction mounting point of the front-end frame on the vehicle body fender mounting plate assembly, and the X direction limit is achieved by assembling the front-end frame fixture to achieve the X direction limit and Y direction automatic centering, and the positioning point of the front-end frame fixture on the vehicle body is consistent with the positioning point of the engine hood fixture. The present invention can perform Z direction precision control on the right and left ends of the front-end frame, thereby reducing and adjusting the gap and surface difference between the bumper and the engine hood assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile manufacturing, and in particular to an adjustable front end frame and an automobile front face assembly method. Background Art

[0002] DTS (Dimensional Technical Specifications) generally refers to the design standards for clearances and flushness between vehicle body components, as well as the control factors for appearance dimensional matching derived from these clearances and flushness, such as parallelism, symmetry, alignment, Radius control, and perceived quality index. Appearance DTS directly informs user static evaluation and is a crucial component of a vehicle's exterior styling, ultimately reflecting the vehicle's craftsmanship. The front of a vehicle is the most critical area of ​​vehicle exterior styling evaluation, encompassing the DTS clearance and flushness relationships between the hood and front bumper, the hood and fender assembly, the hood and headlights, and the front bumper and headlights. To achieve a refined look, these DTS clearances and flushness often eliminate obscured or sharp features, favoring a smoother, more rounded design. For example, a flush hood and front bumper (with X-direction clearance and Z-direction flushness) creates a higher sense of quality than a concealed hood and front bumper (with Z-direction clearance and no flushness). However, achieving superior appearance quality doesn't come naturally; it places higher demands on product structure, component precision, and process quality.

[0003] The main factors affecting the DTS control of the hood and front bumper include the manufacturing accuracy of the hood assembly, the front bumper assembly, the front frame, the body-in-white, the fender assembly, and hood deformation, fender deformation, and front fender deformation. The front frame, especially the plastic one, integrates mounting points such as the front bumper, headlights, and hood locks. Its structure and assembly method directly determine the length of the dimensional chain and the cumulative tolerance. However, during the quality ramp-up phase, limited component manufacturing accuracy resulted in unsatisfactory assembly results. To prevent more defective vehicles during this phase, repairable and convenient vehicles are required. A front frame structure and assembly method that is adjustable in the X, Y, and Z directions in the final assembly workshop is designed to meet the requirements for ensuring the accuracy of the gaps and flushness between the hood and front bumper, and between the hood and headlights in the front face area, as well as for repair and adjustment.

[0004] Patent document CN115593524A discloses a front-end frame and vehicle body connection structure, method, and vehicle, comprising a front-end frame and a vehicle body. Upper and lower Y-direction sliding limit mechanisms are provided on both sides of the front-end frame in the same direction, respectively. The vehicle body comprises two front-end panels and two cabin side beams, the front-end panels being detachably connected to the cabin side beams. The two front-end panels are slidably disposed between the upper and lower Y-direction sliding limit mechanisms on either side of the front-end frame. Both ends of the two front-end panels are provided with transverse waist-shaped holes. This application only allows for Y-direction adjustment through the Y-direction sliding limit mechanism, not Z-direction adjustment. Furthermore, there is no mechanism for adjusting the sliding position of the corresponding slider. The front-end panels can only be fixed with bolts after adjustment, and cannot be adjusted during final assembly. Summary of the Invention

[0005] One of the purposes of the present invention is to provide an adjustable front end frame that can perform Z-direction precision control on the right and left ends of the front end frame; a second purpose is to provide a car front face assembly method using an adjustable front end frame that can reduce and adjust the gap and surface difference between the bumper and the engine hood assembly.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] An adjustable front end frame includes a front end frame middle section, wherein slide grooves are symmetrically arranged on the left and right sides of the front end frame middle section, and sliders are slidably connected in the slide grooves. The slide grooves are provided with adjustment mechanisms for adjusting the sliding positions of the corresponding sliders, and the sliders on the left and right sides are detachably connected to the left section and the right section of the front end frame respectively.

[0008] According to the above technical means, during assembly in the final assembly workshop, if the body or front-end frame is affected by factors such as unqualified precision and deformation in the short term, resulting in the actual vehicle assembly quality not meeting the appearance requirements, in order to ensure normal vehicle delivery, the Z-direction movement distance of the corresponding slider can be adjusted through the adjustment mechanism to thereby make Z-direction adjustments to the front-end frame.

[0009] Furthermore, the adjustment mechanism includes a bushing fixed in the slide groove and an adjusting bolt threaded in the bushing. The tail of the adjusting bolt is embedded in the slider and can rotate along the axis of the adjusting bolt in the slider. The head of the adjusting bolt extends out of the slide groove and can apply force to it to rotate and lock it.

[0010] According to the above technical means, a tool is used to apply force to the head of the adjusting bolt to make it rotate, thereby driving the slider to move in the Z direction in the sliding groove.

[0011] Furthermore, scale lines for marking the rotation angle of the adjusting bolt are provided at the peripheral position corresponding to the adjusting bolt on the middle section of the front end frame.

[0012] According to the above technical means, the scale line can mark the Z-direction adjustment distance of the left section or the right section of the front end frame by marking the rotation angle of the adjustment bolt.

[0013] Furthermore, the left section of the front end frame and the right section of the front end frame are both provided with positioning pins, and the sliding blocks are both provided with positioning holes for cooperating with the positioning pins.

[0014] According to the above technical means, the left section and the right section of the front end frame are tightly matched with their corresponding slider hole pins through the positioning pins, and the XY adjustment of the left section and the right section of the front end frame can be achieved by adding or removing gaskets on the positioning pins.

[0015] Furthermore, the front end frame middle section, the front end frame left section and the front end frame right section are all made of plastic.

[0016] According to the above technical means, since the plastic front-end frame has high manufacturing precision, light weight, and can integrate installation points such as the front bumper, headlights, and front hood locks, it has a high degree of modularity and is more conducive to ensuring the quality of the front face appearance.

[0017] A method for assembling the front face of an automobile, comprising assembling a hood assembly to a vehicle body, assembling the hood assembly to a fender assembly, assembling the above-described adjustable front end frame to the vehicle body, and assembling a front bumper to the adjustable front end frame. The assembly method comprises the following steps:

[0018] S1. The hood hinge is self-positioned and assembled to the hood assembly;

[0019] S2. Assemble the hood assembly with hinges to the vehicle body using a hood fixture. Position the fixture in the Z direction at the shotgun position on the vehicle body and in the X and Y directions at the shock absorber positioning holes or separately designated process holes.

[0020] S3. The fender assembly is assembled to the vehicle body using the fender fixture. The fender fixture positioning is consistent with the hood fixture positioning or is assembled based on the vehicle coordinate system. The fender assembly is positioned against the fixture block in the Y direction, self-positioned to the fender mounting bracket in the Z direction, and limited in the X direction by the block where it mates with the front door.

[0021] S4, the adjustable front end frame is assembled to the vehicle body through the front end frame fixture;

[0022] S5, the front bumper is self-positioned and assembled to the body and the adjustable front end frame;

[0023] S6. After assembly is completed, check the gap and flushness between the engine hood and the front bumper according to the preset gap and flushness control range.

[0024] Furthermore, in S4, the adjustable front end frame is assembled to the vehicle body via a front end frame fixture, specifically including:

[0025] S41. Integrate the front-end frame's Z-direction mounting points onto the fender mounting plate assembly. Perform Y-direction welding and assembly during the final assembly process. Use a fixture to directly ensure the accuracy of the front-end frame's Z-direction mounting points. Then, self-position the adjustable front-end frame onto the fender mounting plate assembly using the front-end frame's Z-direction mounting points. If there is any Z-direction deviation of the adjustable front-end frame, adjust it before installation.

[0026] S42. The XY directions of the adjustable front-end frame are assembled by the front-end frame fixture. The front-end frame fixture is positioned to the vehicle body by positioning blocks at multiple corresponding positions to limit the fixture in the Z direction. The front-end frame fixture is positioned to the fender assembly by pins to limit the fixture in the XY directions. The front-end frame fixture is provided with positioning pins that can be connected to the adjustable front-end frame to position the adjustable front-end frame in the XY directions. If there is any deviation in the XY directions of the adjustable front-end frame, it should be adjusted before installation.

[0027] According to the above technical means, the front-end frame adopts the front-end frame fixture to achieve X-axis limit and Y-axis positioning points on the vehicle body to be consistent with the engine hood fixture for automatic centering, and Z-axis self-positioning to the vehicle body. At the same time, the front-end frame is divided into two sections and installed independently. The upper part is an adjustable front-end frame, which mainly integrates important installation points such as the front bumper and headlights. The lower part mainly integrates other non-important installation points. The upper section is further divided into three sections: the middle section of the front-end frame, the left section of the front-end frame, and the right section of the front-end frame. The left section of the front-end frame and the right section of the front-end frame can realize manual adjustment of the relative relationship in the Z direction through the structure for self-positioning assembly.

[0028] Furthermore, in S41, the method for adjusting the Z-direction deviation of the adjustable front end frame is:

[0029] The adjusting bolt is rotated by a tool to drive the slider to move in the Z direction, thereby achieving Z-direction adjustment between the front end frame body and the left section and the right section of the front end frame.

[0030] Furthermore, in S41, the method for adjusting the XY deviation of the adjustable front end frame is:

[0031] When the mass status of a single vehicle body is inconsistent, the bolts assembled through the holes on the separate front-end frame left section and the front-end frame right section are adjusted to perform XY adjustments to target the mass of the individual vehicle body;

[0032] When the overall vehicle body mass status tends to be consistent or regular, shims are added or removed from the locating pins of the front-end frame fixture to make XY adjustments, thereby adjusting the installation posture of the adjustable front-end frame to avoid subsequent batch problems.

[0033] According to the above technical means, the front-end frame can be individually adjusted in the XY direction or the entire batch can be adjusted in the XY direction according to the individual or batch quality problems of the vehicle body, thereby improving the adjustment efficiency.

[0034] Furthermore, the preset gap control range is 3.5±1.0 mm, the parallelism is not greater than 1.0 mm, and the preset flushness control range is -1.0±1.2 mm, and the parallelism is not greater than 1.2 mm.

[0035] According to the above technical means, the control range of the gap and surface difference can ensure that the engine hood assembly is flush with the front bumper, with a better sense of styling quality.

[0036] Beneficial effects of the present invention:

[0037] 1. Since the front-end frame is divided into the middle section, left section, and right section, the left and right sections can be adjusted in the Z direction via threaded adjustment sliders. Ultimately, by adjusting the left and right sections of the front-end frame, the front bumper assembly position can be changed to reduce the gap and surface difference between the front bumper and the hood assembly. This solves the problem of being unable to perform Z-direction precision adjustment of the front-end frame in the final assembly workshop during the production process, and improves the pass rate of the front face appearance off the final assembly line during the production phase.

[0038] 2. During front-end frame assembly, the Y-axis is self-positioned by integrating the Z-axis mounting point of the front-end frame on the body fender mounting plate assembly. The X-axis limit and Y-axis automatic centering are achieved through the assembly of the front-end frame fixture. The positioning point of the front-end frame fixture on the body is consistent with the positioning point of the engine hood fixture, which can ensure the shortest dimensional chain, reduce cumulative tolerances, and make the DTS accuracy of the engine hood and front bumper easier to control. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural diagram of the adjustable front-end framework;

[0040] Figure 2 It is an exploded diagram of the adjustable front-end frame;

[0041] Figure 3 yes Figure 1 Schematic diagram of the cross section at point A;

[0042] Figure 4 This is the assembly flow chart of the front face parts of a car.

[0043] Technical features and markings in the figure:

[0044] 1. Adjustable front end frame, 11. Middle section of front end frame, 12. Left section of front end frame, 13. Right section of front end frame, 14. Positioning pin, 15. Bushing, 16. Adjusting bolt, 17. Slider, 18. Positioning hole. DETAILED DESCRIPTION

[0045] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will be able to understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for the purpose of illustrating the present invention and are not intended to limit the scope of protection of the present invention.

[0046] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. The illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0047] This embodiment proposes an adjustable front-end frame 1, such as Figures 1 to 3 As shown, the front end frame comprises a middle section 11 of the front end frame. Slideways 17 are symmetrically arranged on the left and right sides of the middle section 11. Each of the slideways is slidably connected to a slider 17. Each of the slideways is equipped with an adjustment mechanism for adjusting the sliding position of the corresponding slider 17. The left and right sliders 17 are detachably connected to the left and right sections 12 and 13 of the front end frame, respectively. During assembly in the final assembly workshop, if the vehicle body or front end frame is affected by factors such as substandard precision and deformation in the short term, resulting in the actual vehicle assembly quality not meeting appearance requirements, the front end frame can be adjusted in the Z direction by adjusting the Z-direction movement distance of the corresponding slider 17 through the adjustment mechanism to ensure normal vehicle delivery. The middle section 11, left section 12, and right section 13 of the front end frame are all made of plastic. Plastic front end frames offer high manufacturing precision, are lightweight, and can integrate mounting points such as the front bumper, headlights, and hood locks. They are highly modular and thus better ensure the quality of the front face appearance.

[0048] In this embodiment, Figure 3As shown, the adjustment mechanism includes a bushing 15 fixedly connected to the slideway and an adjustment bolt 16 threadedly connected to the bushing 15. The tail of the adjustment bolt 16 is embedded in the slider 17 and can rotate within the slider 17 along the axis of the adjustment bolt 16. The head of the adjustment bolt 16 extends out of the slideway and can be forcefully rotated and locked. The head of the adjustment bolt 16 is forcefully applied by a tool to rotate it, thereby driving the slider 17 to move in the Z direction within the slideway. The front end frame middle section 11 is provided with scale lines corresponding to the peripheral positions of the adjustment bolt 16 to indicate the rotation angle of the adjustment bolt 16. The scale lines can indicate the Z-axis adjustment distance of the front end frame left section 12 or the front end frame right section 13 by indicating the rotation angle of the adjustment bolt 16.

[0049] In this embodiment, Figure 2 As shown, the front frame left section 12 and the front frame right section 13 are each provided with a positioning pin 14, and the slider 17 is each provided with a positioning hole 18 for cooperating with the positioning pin 14. The front frame left section 12 and the front frame right section 13 are fixed by screws after the positioning pins 14 are tightly matched with the corresponding hole pins of the slider 17.

[0050] This embodiment also proposes a method for assembling the front face of a car. Figure 4 As shown, the automobile front face assembly includes the assembly of the engine hood assembly and the vehicle body, the engine hood assembly and the fender assembly, the assembly of the adjustable front end frame 1 and the vehicle body, and the assembly of the front bumper and the adjustable front end frame 1. The assembly method includes the following steps:

[0051] S1. The hood hinge is self-positioned and assembled to the hood assembly;

[0052] S2. The hood assembly with hinges is assembled to the vehicle body using a hood fixture. The fixture is positioned in the Z direction to the shotgun of the vehicle body and in the XY directions to the shock absorber positioning hole 18 or a separately set process hole. The shotgun in the vehicle structure refers to the upper longitudinal beam, the reinforcement structure of the front longitudinal beam, that is, the structure between the hinge pillar and the headlight crossbeam.

[0053] S3. The fender assembly is assembled to the vehicle body using the fender fixture. The fender fixture positioning is consistent with the hood fixture positioning or is assembled based on the vehicle coordinate system. The fender assembly is positioned against the fixture block in the Y direction, self-positioned to the fender mounting bracket in the Z direction, and limited in the X direction by the block where it mates with the front door.

[0054] S4, the adjustable front end frame 1 is assembled to the vehicle body through the front end frame fixture;

[0055] S41. Integrate the Z-direction mounting points of the front-end frame onto the fender mounting plate assembly of the vehicle body and perform Y-direction welding and assembly during the final assembly process. Use a fixture to directly ensure the accuracy of the Z-direction mounting points of the front-end frame. Then, self-position the adjustable front-end frame 1 onto the fender mounting plate assembly using the Z-direction mounting points of the front-end frame. If there is any deviation in the Z direction of the adjustable front-end frame 1, adjust it before installation.

[0056] The Z-direction deviation of the adjustable front frame 1 is adjusted as follows:

[0057] The adjusting bolt 16 is rotated by a tool to drive the slider 17 to move in the Z direction, thereby achieving Z-direction adjustment between the front end frame body and the front end frame left section 12 and the front end frame right section 13 .

[0058] S42. The XY directions of the adjustable front end frame 1 are assembled by the front end frame fixture. The front end frame fixture is positioned to the vehicle body by the positioning block to limit the fixture in the Z direction. The front end frame fixture is positioned to the fender assembly by the pin to limit the fixture in the XY directions. The front end frame fixture is provided with positioning pins that can be connected to the adjustable front end frame 1 to position the adjustable front end frame 1 in the XY directions. If there is any deviation in the XY directions of the adjustable front end frame 1, it will be adjusted before installation. A connecting rod structure is provided in the middle of the front end frame fixture for the automatic centering function of the adjustable front end frame 1 in the Y direction.

[0059] The adjustment method of the XY deviation of the adjustable front frame 1 is as follows:

[0060] When the mass status of a single vehicle body is inconsistent, the bolts of the through-hole assembly on the left and right sections of the front-end frame 12 and 13 are adjusted for XY adjustment. The through-hole assembly has a single-side adjustment margin of 2.5mm to adjust the mass of the individual vehicle body. When the mass status of the overall vehicle body tends to be consistent or regular, the shims are added or removed from the positioning pins of the front-end frame fixture to adjust the XY direction, thereby adjusting the installation posture of the adjustable front-end frame to avoid subsequent batch problems. By adjusting the front-end frame individually or in batches according to the quality issues of the vehicle body, the XY direction can be adjusted individually or in batches, improving the adjustment efficiency.

[0061] The front-end frame adopts the front-end frame fixture to achieve X-axis limit and Y-axis automatic centering (the positioning point on the vehicle body is consistent with the engine hood fixture), and Z-axis self-positioning to the vehicle body (the corresponding vehicle body accuracy needs to be optimized through process to ensure manufacturing accuracy). At the same time, the front-end frame is divided into two sections and installed independently. The upper part is an adjustable front-end frame 1, which mainly integrates important installation points such as the front bumper and headlights. The lower part mainly integrates other non-important installation points. The upper section is further divided into the front-end frame middle section 11, the front-end frame left section 12, and the front-end frame right section 13. The front-end frame left section 12 and the front-end frame right section 13 are self-positioned and assembled with the front-end frame middle section 11 (the relative relationship in the Z direction can be manually adjusted through the structure).

[0062] S5, the front bumper is self-positioned and assembled to the vehicle body and the adjustable front end frame 1;

[0063] S6. After assembly is completed, check the gap and flushness between the engine hood and the front bumper according to the preset gap and flushness control range.

[0064] The preset clearance control range is 3.5±1.0mm, with parallelism no greater than 1.0mm, and the preset flushness control range is -1.0±1.2mm, with parallelism no greater than 1.2mm. This clearance and flushness control range ensures a flush fit between the hood assembly and the front bumper, enhancing the styling quality.

[0065] It can be seen from the detailed description of the above embodiments that the front end frame of the present invention is divided into a front end frame middle section 11, a front end frame left section 12 and a front end frame right section 13. The front end frame left section 12 and the front end frame right section 13 can be adjusted in the Z direction through a threaded adjustment slider 17. Finally, by adjusting the left and right sections of the front end frame, the front bumper assembly position is changed to reduce the gap and surface difference between the front bumper and the engine hood assembly, which solves the problem that the front end frame cannot be accurately adjusted in the Z direction in the final assembly workshop during the production process, and improves the qualified rate of the front face appearance of the final assembly line in the production stage.

[0066] In addition, since the front-end frame is self-positioned in the Y direction by integrating the Z-direction mounting point of the front-end frame on the body fender mounting plate assembly during assembly, the X-direction limit is achieved through the assembly of the front-end frame fixture to achieve X-direction limit and Y-direction automatic centering, the positioning point of the front-end frame fixture on the body is consistent with the positioning point of the engine hood fixture, which can ensure the shortest dimensional chain, reduce cumulative tolerances, and make the DTS accuracy of the engine hood and front bumper easier to control.

[0067] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A method for assembling the front face of an automobile, characterized in that: The automobile front face assembly includes the assembly of the engine hood assembly and the vehicle body, the assembly of the engine hood assembly and the fender assembly, the assembly of the adjustable front end frame and the vehicle body, and the assembly of the front bumper and the adjustable front end frame. The assembly method includes the following steps: S1. The hood hinge is self-positioned and assembled to the hood assembly; S2. Assemble the hood assembly with hinges to the vehicle body using a hood fixture. Position the fixture in the Z direction at the shotgun position on the vehicle body and in the X and Y directions at the shock absorber positioning holes or separately designated process holes. S3. The fender assembly is assembled to the vehicle body using the fender fixture. The fender fixture is positioned consistent with the hood fixture or based on the vehicle coordinate system. The fender assembly is positioned in the Y direction by the fender fixture block, positioned in the Z direction by the fender mounting bracket, and positioned in the X direction by the block where it mates with the front door. S4. An adjustable front-end frame is assembled to the vehicle body using a front-end frame assembly. The adjustable front-end frame includes a front-end frame middle section, with slide grooves symmetrically provided on the left and right sides of the front-end frame middle section. Slide blocks are slidably connected within the slide grooves. Each slide groove is provided with an adjustment mechanism for adjusting the sliding position of the corresponding slide block. The left and right slide blocks are detachably connected to the left and right sections of the front-end frame, respectively. The assembly method includes: S41. Integrate the front-end frame's Z-direction mounting points onto the fender mounting plate assembly. Perform Y-direction welding and assembly during the final assembly process. Use a fixture to directly ensure the accuracy of the front-end frame's Z-direction mounting points. Then, self-position the adjustable front-end frame onto the fender mounting plate assembly using the front-end frame's Z-direction mounting points. If there is any Z-direction deviation of the adjustable front-end frame, adjust it before installation. S42. The adjustable front end frame is assembled in the X and Y directions using a front end frame fixture. The front end frame fixture is positioned to the vehicle body using a plurality of positioning blocks at corresponding positions to limit the fixture in the Z direction. The front end frame fixture is positioned to the fender assembly using pins to limit the fixture in the X and Y directions. The front end frame fixture is provided with positioning pins that can be connected to the adjustable front end frame to position the adjustable front end frame in the X and Y directions. If the adjustable front end frame has any deviation in the X and Y directions, adjust it before installation. S5, the front bumper is self-positioned and assembled to the body and the adjustable front end frame; S6. After assembly is completed, check the gap and flushness between the engine hood and the front bumper according to the preset gap and flushness control range.

2. The automobile front face assembly method according to claim 1, characterized in that: In the above S41, the Z-direction deviation of the adjustable front frame is adjusted as follows: The adjusting bolt is rotated by a tool to drive the slider to move in the Z direction, thereby achieving Z-direction adjustment between the front end frame body and the left section and the right section of the front end frame.

3. The automobile front face assembly method according to claim 1, characterized in that: In the above S41, the method for adjusting the XY deviation of the adjustable front end frame is as follows: When the mass status of a single vehicle body is inconsistent, the bolts assembled through the holes on the separate front-end frame left section and the front-end frame right section are adjusted to perform XY adjustments to target the mass of the individual vehicle body; When the overall vehicle body mass status tends to be consistent or regular, shims are added or removed from the locating pins of the front-end frame fixture to make XY adjustments, thereby adjusting the installation posture of the adjustable front-end frame to avoid subsequent batch problems.

4. The automobile front face assembly method according to claim 1, characterized in that: In the above-mentioned S6, the preset gap control range is 3.5±1.0 mm, the parallelism is not greater than 1.0 mm, and the preset flushness control range is -1.0±1.2 mm, and the parallelism is not greater than 1.2 mm.

5. The automobile front face assembly method according to claim 1, characterized in that: The adjustment mechanism includes a bushing fixed in the slide groove and an adjustment bolt threaded in the bushing. The tail of the adjustment bolt is embedded in the slider and can rotate along the axis of the adjustment bolt in the slider. The head of the adjustment bolt extends out of the slide groove and can apply force to it to rotate and lock it.

6. The automobile front face assembly method according to claim 5, characterized in that: Scale lines for marking the rotation angle of the adjusting bolt are provided at the peripheral position corresponding to the adjusting bolt on the middle section of the front end frame.

7. The automobile front face assembly method according to claim 1, characterized in that: The left section of the front end frame and the right section of the front end frame are both provided with positioning pins, and the sliding blocks are both provided with positioning holes for cooperating with the positioning pins.

8. The automobile front face assembly method according to any one of claims 1 to 7, characterized in that: The front end frame middle section, the front end frame left section and the front end frame right section are all made of plastic.

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