Frame assembly welding positioning tool and assembly process

Abstract

The invention discloses a frame assembly welding and positioning tool which comprises a second cross beam assembly positioning and welding tool which comprises a base. The vertical stand column is installed on the base and used for supporting a linear section of a second cross beam, the inclined stand column is used for supporting a bent section of the second cross beam, the first positioning frame is used for supporting a left reinforcing box, the second positioning frame is used for supporting a right reinforcing box, and the installation frame is used for placing connecting plates at the two ends of a second cross beam assembly. The second cross beam assembly serves as an important component of the frame assembly, the positioning and welding quality of the second cross beam assembly directly affects the stability and safety of the whole frame, the positioning and welding tool ensures that all parts on the second cross beam assembly are accurately aligned, manual operation errors are reduced, the welding accuracy is improved, and the production efficiency is improved. And all parts of the second cross beam assembly can be welded in one time, so that the welding efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile assembly, and in particular to a frame assembly welding positioning tool and an assembly process. Background Art

[0002] At present, most commercial vehicle frames are side beam frames, that is, a solid rigid frame composed of two longitudinal beams located on both sides and a number of cross beams connected by riveting or welding.

[0003] At present, the conventional assembly method of automobile frame assemblies is to use the longitudinal beam as the positioning reference. There is no special welding tooling to position important key components. The positioning basically relies on the longitudinal beam and other important key components on the frame, which makes the welding error of the frame assembly large.

[0004] When the welding error of the frame assembly is large, the quality of the frame assembly will be poor and will cause the following problems: 1. The center line of the frame will be offset, which will reduce the vehicle's driving stability, damage the suspension system, reduce the braking performance, and damage the body structure, affecting the service life of the vehicle; 2. After riveting and assembly, the frame assembly will have a large error in the structural position with the boundary system (a system used to define the vehicle boundary or monitor the vehicle's surrounding environment, such as reversing radar, surround-view camera, etc.), affecting the chassis assembly and even the vehicle's driving quality. Summary of the invention

[0005] The present invention is intended to provide a frame assembly welding positioning tool to solve the problem that there is no special welding tool and clamping tool to position important key components, and the positioning basically relies on the longitudinal beam and other important key components on the frame, resulting in a large welding error of the frame assembly.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] A frame assembly welding positioning tool includes a second beam assembly positioning welding tool, the second beam assembly positioning welding tool includes a base, and a vertical column installed on the base for supporting the straight section of the second beam, an oblique column for supporting the bent section of the second beam, a first positioning frame for supporting a left reinforcement box, a second positioning frame for supporting a right reinforcement box, and a mounting frame for placing connecting plates at both ends of the second beam assembly.

[0008] The advantages of this solution are:

[0009] 1. As an important part of the frame assembly, the quality of the positioning welding of the second crossbeam assembly directly affects the stability and safety of the entire frame. The second crossbeam assembly enhances the lateral rigidity and overall stability of the frame by connecting the front and rear longitudinal beams. The second crossbeam assembly can effectively disperse the impact force from the road and the gravity of the vehicle itself, reduce the force on the longitudinal beam, and extend the service life of the frame. The second crossbeam assembly provides a reliable installation point for components such as the suspension system and transmission system to ensure the stability and reliability of these components. The second crossbeam assembly must be precisely aligned with the front and rear longitudinal beams to ensure that there is no deviation in the structure after welding. Any slight deviation may cause deformation of the frame and affect the performance of the entire vehicle.

[0010] 2. This welding positioning tool ensures the efficiency and accuracy of the one-time welding of the second beam assembly. The vertical column and the oblique column can ensure the accurate placement of the second beam, and the uniform force on the second beam during welding, reducing deformation and welding quality problems caused by uneven local force. A positioning device is set up for positioning the connecting plate, the left reinforcement box and the right reinforcement box. The positioning device ensures the precise alignment of all parts, reduces human operation errors, and improves the accuracy of welding. All parts of the second beam assembly can be completed in one welding process, greatly improving the welding efficiency.

[0011] Furthermore, the first positioning frame of the second crossbeam assembly positioning welding tool is provided with a first protrusion matching the left reinforcement box installation hole, and the second positioning frame is provided with a second protrusion matching the right reinforcement box installation hole. The left reinforcement box and the right reinforcement box need to be installed on the arc-shaped surface of the second crossbeam, and it is very important to accurately position the reinforcement box. The first protrusion and the second protrusion ensure that the left reinforcement box and the right reinforcement box can be quickly positioned in the accurate position before welding.

[0012] Furthermore, the tops of the first protrusion and the second protrusion are rotatably connected with a first clamping block and a second clamping block respectively, and the centers of the first clamping block and the second clamping block are eccentrically arranged relative to the first protrusion and the second protrusion. In order to prevent the left reinforcement box and the right reinforcement box from falling off from the first protrusion and the second protrusion under the action of external force, thereby affecting the accuracy of the positions of the left reinforcement box and the right reinforcement box, the first clamping block and the second clamping block are rotatably connected to the first protrusion and the second protrusion, and the left reinforcement box and the right reinforcement box can be prevented from sliding off from the tops of the first protrusion and the second protrusion by rotating the first clamping block and the second clamping block out.

[0013] Furthermore, a support column is provided beside the vertical column, and a pressure plate for fixing the second beam is rotatably connected to the support column. After the components of the second beam assembly are positioned, the second beam can be pressed by turning the pressure plate to prevent the second beam, as the most important component, from moving during welding.

[0014] Furthermore, a support column is provided beside the vertical column, and a pressure plate for fixing the second beam is slidably connected to the support column. After the components of the second beam assembly are positioned, the second beam can be pressed by the sliding pressure plate to prevent the second beam, as the most important component, from moving during welding.

[0015] Furthermore, the first clamping block and the second clamping block are rotatably connected to the top of the first protrusion and the second protrusion through one end of the rotating shaft, respectively. A guide plate is fixedly connected to the other end of the rotating shaft. When the pressing plate slides in the direction of fixing the second crossbeam, the pressing plate pushes the guide plate to rotate. With this structure, the second crossbeam can be pressed and positioned while the guide plate is pushed to rotate, so that the rotating shaft rotates. The first clamping block and the second clamping block are rotated out under the drive of the rotating shaft to prevent the left reinforcement box and the right reinforcement box from sliding along the first protrusion and the second protrusion, thereby achieving the clamping of the second crossbeam, the left reinforcement box and the right reinforcement box at the same time. The efficiency and accuracy of positioning welding are improved.

[0016] Furthermore, the distance between the first clamping block and the first positioning frame is equal to the thickness of the left reinforcing box, and the distance between the second clamping block and the second positioning frame is equal to the thickness of the right reinforcing box. Thus, the left reinforcing box and the right reinforcing box can be clamped effectively, which can prevent the left reinforcing box and the right reinforcing box from being crushed and prevent the left reinforcing box and the right reinforcing box from moving up and down during welding.

[0017] The present invention also provides a frame assembly assembly process to solve the problem of poor quality of the frame assembly caused by improper positioning and assembly methods.

[0018] A frame assembly assembly process, based on the above-mentioned frame assembly assembly positioning tool, includes the following steps:

[0019] S1. Position welding of the second crossbeam assembly, the left engine bracket assembly, the right engine bracket assembly, the left rear spring hanging ear bracket assembly, the right rear spring hanging ear bracket assembly, the cab bracket assembly and the transmission shaft crossbeam assembly, wherein the second crossbeam assembly is welded once using the second crossbeam assembly positioning welding tool;

[0020] S2. Lift the left and right longitudinal beams for positioning and clamping. Position and clamp to determine the verticality of the left and right longitudinal beams. Rivet the cargo box support, rear shock absorber bracket assembly, inner reinforcement box, cab bracket assembly and front shock absorber bracket on the left and right longitudinal beams respectively;

[0021] S3. Position and clamp the relative distance between the left and right longitudinal beams, determine the Y-axis width of the frame, assemble the crossbeam, and assemble the transmission crossbeam assembly, the drive shaft crossbeam assembly, the rear spring front crossbeam assembly, the rear spring rear crossbeam, the tail crossbeam, the second crossbeam assembly, and the water pipe crossbeam in sequence;

[0022] S4. Install the crush beam at the front end of the left longitudinal beam and the right longitudinal beam, then install the front cross beam and rivet it, then install the front shock absorber bracket on both sides of the left longitudinal beam and the right longitudinal beam, and position and rivet the rear spring left front bracket assembly, right front bracket assembly, rear spring left hanging ear bracket assembly and rear spring right hanging ear bracket assembly at the rear section of the frame through round rods;

[0023] S5. Flip the assembled frame over and reposition and clamp it. At this time, first rivet the beams that have not been riveted in the previous steps, and then install the remaining small parts.

[0024] S6. Correct the distance between the engine and transmission brackets and the width of the lifting lugs.

[0025] The advantages of this solution are:

[0026] In S1, the assembly of important key components is pre-welded into a small assembly. Next, in S2, the components or small assemblies that only need single-point positioning and are positioned on the left and right longitudinal beams are installed. Then, in S3, the components or assemblies that need to be connected to both the left and right longitudinal beams are installed. The installation order is critical in this step. Because the width of the rear section of the frame assembly is generally 780mm and is a long straight section, the Y-axis width of the assembly can be accurately controlled by first welding and positioning the rear section crossbeams. Because the front end of the frame is a deformation area, the second crossbeam assembly is assembled first. Positioning and assembling in sequence towards the front of the vehicle can accurately locate the Y-direction width of the front end of the assembly. After S3, the frame of the frame assembly has been formed. The crush beam is installed in S4 because the crush beam is prone to crush deformation. The front shock absorber bracket, the rear spring left front bracket assembly, the right front bracket assembly, the rear spring left hanging ear bracket assembly and the rear spring right hanging ear bracket assembly involve multiple parts splicing. Even a single assembly needs to be installed with the help of different surfaces and positions of the frame assembly. Therefore, they all need to be installed after the frame of the frame assembly is formed to ensure the accuracy of the shape and position.

[0027] Further, in step S1, the method for positioning and welding the second crossbeam assembly is as follows:

[0028] Step 1: Put the connecting plate on both ends of the second crossbeam, place the second crossbeam on the vertical column and the oblique column, and position the connecting plate through the mounting frame;

[0029] Step 2: Place the left reinforcement box and the right reinforcement box through the first protrusion and the second protrusion and place them on the first positioning frame and the second positioning frame respectively;

[0030] Step 3: Push the pressing plate to make it slide in the direction of fixing the second crossbeam, and at the same time, the pressing plate pushes the guide plate to rotate, so that the first clamping block and the second clamping block rotate eccentrically, and the left reinforcement box and the right reinforcement box are clamped;

[0031] Step 4: Weld the connecting plate, the left reinforcement box and the right reinforcement box to the second cross beam at one time.

[0032] The positioning welding of the second crossbeam assembly has the following advantages:

[0033] 1. Perform better positioning and install the left reinforcement box, right reinforcement box and connecting plate on the second crossbeam at one time.

[0034] 2. The second crossbeam, the left reinforcement box and the right reinforcement box can be clamped while the second crossbeam is pressed and positioned, thereby improving welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a structural schematic diagram of a vehicle frame assembly;

[0036] Figure 2 It is a structural schematic diagram of Embodiment 1 of the second crossbeam assembly positioning welding tool in the positioning welding state;

[0037] Figure 3 It is a structural schematic diagram of Embodiment 1 of the second crossbeam assembly positioning welding tool in a state where no workpiece is placed;

[0038] Figure 4 It is a structural schematic diagram of embodiment 3 of the second crossbeam assembly positioning welding tooling. DETAILED DESCRIPTION

[0039] The following is further described in detail through specific implementation methods:

[0040] The figure marks in the drawings of the specification include: second crossbeam assembly positioning welding tool 1, vertical column 101, oblique column 102, first positioning frame 103, second positioning frame 104, mounting frame 105, first protrusion 106, second protrusion 107, pressure plate 108, first clamping block 109, second clamping block 110, guide plate 111, right longitudinal beam 2, collapse beam 3, cab front bracket assembly 4, front shock absorber bracket 5, water pipe crossbeam 6, second crossbeam assembly 7, engine right bracket assembly 8, cab middle bracket assembly 9, transmission crossbeam assembly 10, drive shaft crossbeam assembly 11, rear spring front crossbeam assembly 12, cargo box support 13, rear spring rear crossbeam 14, rear spring right lifting ear bracket 15, tail crossbeam 16, rear shock absorber bracket assembly 17.

[0041] The frame assembly structure in embodiments 1 and 2 is as follows: Figure 1The frame assembly includes the left and right longitudinal beams 2 located on both sides, and small assemblies and parts symmetrically installed on the left and right longitudinal beams 2. The frame assembly is sequentially equipped with the collapse beam 3, the cab front bracket assembly 4, the front shock absorber bracket 5, the water pipe cross beam 6, the second cross beam assembly 7, the engine bracket assembly, the longitudinal beam reinforcement box, the cab middle bracket assembly 9, the transmission cross beam assembly 10, the transmission shaft cross beam assembly 11, the rear spring front cross beam assembly 12, the cargo box support 13, and the rear shock absorber bracket assembly 17 along the left and right longitudinal beams 2 from front to back. , rear spring rear cross beam 14, rear spring ear bracket, tail cross beam 16, among which, the collapse beam 3, the cab front bracket assembly 4, the front shock absorber bracket 5, the engine bracket assembly, the longitudinal beam reinforcement box, the cab middle bracket assembly 9, the cargo box support 13, and the rear spring ear bracket are only installed on one side of the left longitudinal beam and the right longitudinal beam 2, and the water pipe cross beam 6, the second cross beam assembly 7, the transmission cross beam assembly 10, the drive shaft cross beam assembly 11, the rear spring front cross beam assembly 12, the rear spring rear cross beam 14, and the tail cross beam 16 need to be connected to both sides of the left longitudinal beam and the right longitudinal beam 2.

[0042] Example 1

[0043] In this embodiment, the second crossbeam assembly positioning welding tool 1 is used. Figure 2 and Figure 3 As shown, the second beam assembly 7 positioning welding tool includes a base, and a vertical column 101 installed on the base for supporting the straight section of the second beam, an oblique column 102 for supporting the bent section of the second beam, a first positioning frame 103 for supporting the left reinforcement box, a second positioning frame 104 for supporting the right reinforcement box, and a mounting frame 105 for placing the connecting plates at both ends of the second beam assembly 7. A support column is also provided next to the vertical column 101, and a pressing plate 108 for pressing the second beam is rotatably connected to the top of the support column. A first protrusion 106 matching the left reinforcement box mounting hole is provided on the top surface of the first positioning frame 103 of the second beam assembly 7 positioning welding tool, and two second protrusions 107 matching the right reinforcement box mounting holes are provided on the top surface of the second positioning frame 104.

[0044] The frame assembly process includes the following steps:

[0045] S1. Positioning and welding the second crossbeam assembly 7, the left engine bracket assembly, the right engine bracket assembly 8, the left rear spring hanging ear bracket assembly, the right rear spring hanging ear bracket 15 assembly, the front cab bracket assembly 4, the middle cab bracket assembly 9 and the transmission shaft crossbeam assembly 11. Among them, the second crossbeam assembly 7 is welded at one time using the second crossbeam assembly 7 positioning welding tool. First, the connecting plate is set on both ends of the second crossbeam, the second crossbeam is placed on the vertical column 101 and the oblique column 102, and the connecting plate is positioned through the mounting frame 105; then the left reinforcement box and the right reinforcement box are placed on the first positioning frame 103 and the second positioning frame 104 through the first protrusion 106 and the second protrusion 107 respectively, and then the pressing plate 108 is rotated to press the second crossbeam to prevent the second crossbeam as a main component from deflecting during welding; finally, the connecting plate, the left reinforcement box and the right reinforcement box are welded to the second crossbeam at one time.

[0046] S2. Lift the left longitudinal beam and the right longitudinal beam 2 for positioning and clamping. Positioning and clamping determine the verticality of the left longitudinal beam and the right longitudinal beam 2. Install the parts or small assemblies that are only positioned on the left longitudinal beam and the right longitudinal beam 2. Rivet the cargo box support 13, the rear shock absorber bracket assembly 17, the inner longitudinal beam reinforcement box, the cab bracket assembly 9 and the front shock absorber bracket 5 on the left longitudinal beam and the right longitudinal beam 2 respectively.

[0047] S3. Locate and clamp the relative distance between the left longitudinal beam and the right longitudinal beam 2, determine the Y-direction width of the frame, assemble the crossbeam, and assemble the transmission crossbeam assembly 10, the transmission shaft crossbeam assembly 11, the rear spring front crossbeam assembly 12, the rear spring rear crossbeam 14, the tail crossbeam 16, the second crossbeam assembly 7, and the water pipe crossbeam 6 in sequence. The installation order is critical in this step, because the width of the rear section of the frame assembly is generally 780mm, and it is a long straight section. Therefore, by first welding and positioning the rear section crossbeams, the Y-direction width of the assembly can be accurately controlled. Because the front end of the frame is a deformation area, the second crossbeam assembly 7 is first assembled and then positioned and assembled in turn toward the front of the vehicle, so that the Y-direction width of the front end of the frame assembly can be accurately positioned.

[0048] S4. Install the crush beam 3 at the front end of the left longitudinal beam and the right longitudinal beam 2, then install the front cross beam and rivet it, then install the front shock absorber bracket 5 on both sides of the left longitudinal beam and the right longitudinal beam 2, and position and rivet the rear spring left front bracket and right front bracket assembly and the rear spring left hanging ear bracket and right hanging ear bracket assembly through a round bar at the rear section of the frame. The frame assembly has been accurately positioned, then install the front shock absorber bracket 5, rivet the rear spring left front bracket assembly, the right front bracket assembly, the rear spring left hanging ear bracket assembly and the rear spring right hanging ear bracket 15 assembly, at this time the frame of the second cross beam assembly 7 has been formed, then install the crush beam 3, and reduce the deformation of the crush beam 3 during installation. The front shock absorber bracket 5, the rear spring left front bracket assembly, the right front bracket assembly, the rear spring left hanging ear bracket assembly and the rear spring right hanging ear bracket 15 assembly involve the splicing of multiple parts. Even if it is a single assembly, it needs to be installed with the help of different surfaces and positions of the frame assembly. Therefore, it is necessary to install them after the frame of the frame assembly is formed to ensure the accuracy of the position.

[0049] S5. Flip the assembled frame over and reposition and clamp it. At this time, first rivet the beams that have not been riveted in the previous steps, and then install the remaining small parts.

[0050] S6. Correct the distance between the engine and transmission brackets and the width of the lifting lugs.

[0051] After adopting the welding positioning tooling of the second crossbeam assembly 7 and the frame assembly assembly process in this embodiment, the production efficiency and welding quality of the frame assembly are significantly improved compared with the traditional method, as shown in the following table for details.

[0052] Traditional method The method of this embodiment Average assembly time 6-7 units / hour 12-14 units / hour Dimensional deviation of key components ±2mm ±1mm Repair rate of key components 2％ 1％

[0053] Table 1

[0054] Example 2

[0055] The difference between this embodiment and the first embodiment is that the tops of the first protrusion 106 and the second protrusion 107 are rotatably connected with the first clamping block 109 and the second clamping block 110, respectively, and the centers of the first clamping block 109 and the second clamping block 110 are eccentrically arranged relative to the first protrusion 106 and the second protrusion 107. After the left reinforcement box and the right reinforcement box are respectively placed on the first positioning frame 103 and the second positioning frame 104 through the first protrusion 106 and the second protrusion 107, the first clamping block 109 and the second clamping block 110 are rotated out, and because the centers of the first clamping block 109 and the second clamping block 110 are eccentrically arranged relative to the first protrusion 106 and the second protrusion 107, the first clamping block 109 and the second clamping block 110 will extend out of the outer edges of the first protrusion 106 and the second protrusion 107.

[0056] In this way, the left reinforcement box and the right reinforcement box are blocked by the first clamping block 109 and the second clamping block 110 above them, preventing the left reinforcement box and the right reinforcement box from sliding along the first protrusion 106 and the second protrusion 107, which can better ensure the reliability of welding.

[0057] Example 3

[0058] like Figure 4 As shown, the difference between this embodiment and embodiment 2 is that the pressure plate 108 of the positioning welding fixture on the second beam assembly 7 is slidably connected to the support column, the first clamping block 109 and the second clamping block 110 are respectively rotatably connected to the top of the first protrusion 106 and the second protrusion 107 through one end of the rotating shaft, and the other end of the rotating shaft is fixedly connected with a guide plate 111. When the pressure plate 108 slides in the direction of fixing the second beam, the pressure plate 108 pushes the guide plate 111 to rotate. The distance from the first clamping block 109 to the first positioning frame 103 is equal to the thickness of the left reinforcement box, and the distance from the second clamping block 110 to the second positioning frame 104 is equal to the thickness of the right reinforcement box.

[0059] In this embodiment, there is no need to unscrew the first block 109 and the second block 110 after the left reinforcement box and the right reinforcement box are positioned as in Embodiment 2. Instead, after the left reinforcement box and the right reinforcement box are positioned, the pressure plate 108 is pushed to slide and press the second cross beam. While the pressure plate 108 slides, the pressure plate 108 pushes the guide plate 111 to rotate, thereby causing the shaft to rotate, and the first block 109 and the second block 110 are automatically unscrewed driven by the shaft.

[0060] This structure clamps the second cross beam, the left reinforcement box and the right reinforcement box at the same time, thus improving the efficiency and accuracy of positioning welding.

[0061] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A frame assembly welding positioning tool, characterized in that: It includes a second crossbeam assembly positioning welding tool, which includes a base, and a vertical column installed on the base for supporting the straight section of the second crossbeam, an oblique column for supporting the bent section of the second crossbeam, a first positioning frame for supporting the left reinforcement box, a second positioning frame for supporting the right reinforcement box, and a mounting frame for placing the connecting plates at both ends of the second crossbeam assembly.

2. The frame assembly welding positioning tool according to claim 1, characterized in that: The first positioning frame of the second crossbeam assembly positioning welding tool is provided with a first protrusion matching the left reinforcement box mounting hole, and the second positioning frame is provided with a second protrusion matching the right reinforcement box mounting hole.

3. The frame assembly welding positioning tool according to claim 2 is characterized in that: The tops of the first protrusion and the second protrusion are rotatably connected with a first clamping block and a second clamping block respectively, and the centers of the first clamping block and the second clamping block are eccentrically arranged relative to the first protrusion and the second protrusion.

4. The frame assembly welding positioning tool according to claim 3 is characterized in that: A supporting column is also arranged beside the vertical column, and a pressing plate for fixing the second cross beam is rotatably connected to the supporting column.

5. The frame assembly welding positioning tool according to claim 3 is characterized in that: A supporting column is also arranged beside the vertical column, and a pressing plate for fixing the second cross beam is slidably connected to the supporting column.

6. The frame assembly welding positioning tool according to claim 5, characterized in that: The first clamping block and the second clamping block are rotatably connected to the top of the first protrusion and the second protrusion respectively through one end of the rotating shaft, and a guide plate is fixedly connected to the other end of the rotating shaft. When the pressure plate slides in the direction of fixing the second cross beam, the pressure plate pushes the guide plate to rotate.

7. The frame assembly welding positioning tool according to claim 6, characterized in that: The distance from the first clamping block to the first positioning frame is equal to the thickness of the left reinforcement box, and the distance from the second clamping block to the second positioning frame is equal to the thickness of the right reinforcement box.

8. A frame assembly assembly process, based on the frame assembly welding positioning tool according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Position welding of the second crossbeam assembly, the left engine bracket assembly, the right engine bracket assembly, the left rear spring hanging ear bracket assembly, the right rear spring hanging ear bracket assembly, the cab bracket assembly and the transmission shaft crossbeam assembly, wherein the second crossbeam assembly is welded once using the second crossbeam assembly positioning welding tool; S2. Lift the left and right longitudinal beams for positioning and clamping. Position and clamp to determine the verticality of the left and right longitudinal beams. Rivet the cargo box support, rear shock absorber bracket assembly, inner reinforcement box, cab bracket assembly and front shock absorber bracket on the left and right longitudinal beams respectively; S3. Position and clamp the relative distance between the left and right longitudinal beams, determine the Y-axis width of the frame, assemble the crossbeam, and assemble the transmission crossbeam assembly, the drive shaft crossbeam assembly, the rear spring front crossbeam assembly, the rear spring rear crossbeam, the tail crossbeam, the second crossbeam assembly, and the water pipe crossbeam in sequence; S4. Install the crush beam at the front end of the left longitudinal beam and the right longitudinal beam, then install the front cross beam and rivet it, then install the front shock absorber bracket on both sides of the left longitudinal beam and the right longitudinal beam, and position and rivet the rear spring left front bracket assembly, right front bracket assembly, rear spring left hanging ear bracket assembly and rear spring right hanging ear bracket assembly at the rear section of the frame through round rods; S5. Flip the assembled frame over and reposition and clamp it. At this time, first rivet the beams that have not been riveted in the previous steps, and then install the remaining small parts. S6. Correct the distance between the engine and transmission brackets and the width of the lifting lugs.

9. The frame assembly assembly process according to claim 8, characterized in that: In step S1, the method for positioning and welding the second crossbeam assembly is as follows: Step 1: Put the connecting plate on both ends of the second crossbeam, place the second crossbeam on the vertical column and the oblique column, and position the connecting plate through the mounting frame; Step 2: Place the left reinforcement box and the right reinforcement box through the first protrusion and the second protrusion and place them on the first positioning frame and the second positioning frame respectively; Step 3: Push the pressing plate to make it slide in the direction of fixing the second crossbeam, and at the same time, the pressing plate pushes the guide plate to rotate, so that the first clamping block and the second clamping block rotate eccentrically, and the left reinforcement box and the right reinforcement box are clamped; Step 4: Weld the connecting plate, the left reinforcement box and the right reinforcement box to the second cross beam at one time.

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