Car body assembly splicing equipment and process method for improving car body forming precision

Abstract

The invention relates to vehicle body assembly splicing equipment and a technological method for improving vehicle body forming precision. A bottom plate clamp is provided with a sliding table and a floating table on each of the two sides in the width direction of a vehicle body; the floating table is used for being arranged under the side wall. The side wall clamp is arranged on the sliding table and moves in the width direction of the vehicle body. Side wall target connecting areas are arranged at the target positions of the front and rear air window clamps; the floating table balances the Z-direction gravity of the side wall, the rolling wheels reduce the friction force generated by welding slag burrs on the side wall and the floor in the X direction, and deformation caused by hard blocking is avoided. With a floor as a benchmark, the side wall is accurately positioned through a side wall clamp and a sliding table after the side wall is preassembled; after the top cover is preassembled, the top of the side wall clamp is directly connected with the side wall target connecting area of the front air window clamp and the rear air window clamp, so that the machining precision of parts and the clamp does not need to be improved, and the splicing precision of a whole vehicle body assembly can be achieved only by ensuring the side wall positioning precision through vehicle body assembly splicing equipment.

Description

Technical Field

[0001] The present application relates to the field of automobile manufacturing, and in particular to a vehicle body assembly device and a process method for improving vehicle body forming accuracy. Background Art

[0002] An automobile body assembly is typically welded together from sub-assemblies such as the floor, left / right side panels, and roof. Body assembly is the most critical step in the body manufacturing process, requiring the most complex process and tooling equipment, and plays a crucial role in ensuring the accuracy of the body structure.

[0003] Car body manufacturing precision requirements are becoming increasingly stringent, with accuracy requirements for each point within ±1.0mm, and some points even requiring ±0.5mm. This is typically achieved by improving the precision of parts and the machining accuracy of positioning fixtures. Based on current manufacturing processes, the manufacturing accuracy of stamped parts is typically ±0.5mm, and the accuracy of fixtures is typically ±0.2mm. Simply increasing the machining accuracy of parts and fixtures significantly increases car body manufacturing costs. Summary of the Invention

[0004] The embodiments of the present application provide a vehicle body assembly device and a process method for improving the forming accuracy of the vehicle body, so as to solve the problem that the manufacturing process level in the related technology is usually ±0.5mm in manufacturing accuracy of stamping parts and ±0.2mm in fixture accuracy, and only improving the processing accuracy of parts and fixtures will significantly increase the manufacturing cost of the vehicle body.

[0005] In a first aspect, a vehicle body assembly device is provided, comprising: The floor fixture is used to be fixed to the ground and used to position the floor; the floor fixture is equipped with a sliding platform and a floating platform on both sides in the width direction of the vehicle body; the floating platform is used to be set directly below the side panel and has rollers that contact the side panel; a side panel clamp, which is arranged on the slide and moves along the width direction of the vehicle body; The front and rear windshield clamps are provided with a side panel target connection area; the side panel target connection area is the position on the side panel corresponding to the top of the side panel clamp after the vehicle body is assembled.

[0006] In some embodiments, the front and rear windshield clamps, the bottom plate clamp, and the side panel clamps each include a clamp body and a clamp positioning pin; The clamp body is provided with a rotating clamping block, and a positioning block of a designed length is provided between the clamping block and the clamp body; a clamping space is formed between the positioning block and the clamping block.

[0007] In some embodiments, the diameter of the clamp locating pin of the side panel clamp is smaller than the diameter of the corresponding locating hole on the vehicle body, and is larger than the diameter of the gripper locating pin of the pre-installed side panel mechanical gripper.

[0008] In some embodiments, the floating platform includes a base, a support rod is provided on the base, and a horizontal rod is hinged on the top of the support rod; the roller is provided in the middle of the horizontal rod; a vertical elastic member is provided at the end of the horizontal rod away from the support rod; the elastic member is installed on the top of the base.

[0009] In some embodiments, the floating platform includes a base, an elastic member is provided on the top of the base; a horizontal plate is provided on the top of the elastic member; and the roller is provided on the horizontal plate.

[0010] In some embodiments, there are three slides, which correspond to the front, middle and rear sides of the side panel respectively; each slide is provided with a telescopic member; one telescopic member is connected to one side panel clamp; the telescopic member is telescopic in the width direction of the vehicle.

[0011] In a second aspect, a process for improving the molding accuracy of a vehicle body is provided, which comprises the following steps: Provide the above body assembly equipment; Place the base plate on the base plate fixture to complete the base plate positioning; Use the side panel mechanical gripper to pre-install the side panel into place so that the bottom of the side panel contacts the floating platform; then move the side panel clamp to position and clamp the side panel; After connecting the front and rear windshield fixtures to the top cover, use the top cover mechanical gripper to pre-install the side panel into place; then connect the top of the side panel fixture to the side panel target connection area of ​​the front and rear windshield fixtures.

[0012] In some embodiments, the side panel includes an inner panel and an outer panel; the outer panel is positioned as a flanged hole; Reinforced welding points are provided between the inner plate and the outer plate and around the flange holes.

[0013] In some embodiments, the front and rear windshield clamps, the bottom plate clamp, and the side panel clamps each include a clamp body and a clamp positioning pin; The front end of the clamp positioning pin is a tapered guide portion, and the cylindrical surface is an effective positioning portion; when the side panel is positioned, the effective positioning portion of the clamp positioning pin of the side panel clamp passes through the flanging hole.

[0014] In some embodiments, the clamp body is provided with a rotating clamping block, and a positioning block of a designed length is provided between the clamping block and the clamp body; a clamping space is formed between the positioning block and the clamping block; There is a designed difference between the clamping space value of the side panel clamp and the total thickness of the inner panel and the outer panel; the clamping space value is the gap value between the clamping block and the positioning block.

[0015] The beneficial effects of the technical solution provided by this application include: The present invention provides a vehicle body assembly apparatus and a process method for improving vehicle body forming accuracy. A bottom plate fixture is provided with a slide and a floating platform on both sides in the vehicle body width direction. The floating platform is configured to be positioned directly below the side panel. The side panel fixture is mounted on the slide and moves along the vehicle body width direction. A side panel target connection area is provided at the target position of the front and rear windshield fixtures. The side panel target connection area corresponds to the position on the side panel where the top of the side panel fixture corresponds after the vehicle body is assembled. The floating platform supports the side panel in the Z direction, balancing the Z-direction gravity of the side panel. The rollers reduce the friction between the side panel and the floor in the X direction caused by welding slag and burrs, thereby avoiding deformation caused by hard obstructions. Furthermore, the side panel is precisely positioned using the floor as a reference after pre-installing the side panel. The side panel is then precisely positioned using the side panel fixture and the slide. After pre-installing the top cover, the top of the side panel fixture is directly connected to the side panel target connection area of ​​the front and rear windshield fixtures. This eliminates the need to improve the machining accuracy of parts and fixtures. The assembly accuracy of the entire vehicle body assembly can be achieved by simply ensuring the positioning accuracy of the side panel using the body assembly apparatus. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 A schematic structural diagram of a vehicle body assembly provided in the related art; Figure 2 A schematic diagram of the connection between the vehicle body assembly assembly equipment and the vehicle body assembly provided in an embodiment of the present application; Figure 3 A schematic structural diagram of a side panel clamp provided in an embodiment of the present application; Figure 4 The first structure of the floating platform provided in the embodiment of the present application; Figure 5 This is the second structure of the floating platform provided in the embodiment of the present application.

[0018] In the figure: 1. Front and rear windshield clamps; 100. Upper front clamp; 101. Upper rear clamp; 2. Bottom plate clamp; 3. Floating platform; 300. Base; 301. Support rod; 302. Horizontal rod; 303. Roller; 304. Elastic member; 305. Horizontal plate; 4. Side panel clamp; 5. Clamp body; 6. Clamping block; 7. Positioning block; 8. Positioning pin; 9. Inner plate; 10. Outer plate; 11. Strengthened welding point. DETAILED DESCRIPTION

[0019] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0020] It should be understood that: The current positioning situation is: The body assembly is precisely positioned by the fixture before welding. Figure 1 This is a structural diagram of the body assembly, which consists of a floor, left side panel, right side panel, roof cover, etc., marked as a, b, c, and d respectively: the bottom fixture first positions the floor, and then the left side panel, right side panel, and roof cover are pre-installed to determine the approximate position. The upper fixture is then moved into position to position the left / right side panel and roof cover respectively, and finally a body assembly is formed by welding using robots.

[0021] During the pre-installation process, a robot is typically used to initially determine the position of the side panels and roof. Because the robot only has simple positioning and clamping mechanisms, its accuracy is relatively low (typically ±1.0mm), resulting in imprecise side panel pre-installation positions. Furthermore, a side panel subassembly weighs approximately 50kg, and due to gravity, the side panel will sink slightly after pre-installation. Furthermore, the side panel's position must be precisely adjusted once the fixture is in place. However, due to factors such as welding slag, burrs, and surface matching differences during the manufacturing process, significant friction between the side panel and the floor results, making it difficult to accurately adjust the side panel's position. The fixture will then cause deformation in the side panel's positioning holes or surfaces. Consequently, the fixture fails to accurately position the side panel, directly resulting in excessive vehicle body accuracy.

[0022] That is, the problem is: The robot's positioning accuracy is only ±1.0mm, and the weight of the side panel (about 50kg) causes the Z position to sink downward; welding slag / burrs increase the friction between the side panel and the floor, and the forced positioning of the fixture causes the positioning hole to deform.

[0023] When the manipulator and the fixture act at the same time, the accuracy conflicts and the accuracy fails due to the mismatch of the positioning pin gap (±1.0mm and ±0.2mm do not match).

[0024] In response to the above problems, the embodiments of the present application provide a body assembly equipment and a process method for improving the body forming accuracy, so as to solve the problem that the manufacturing process level in the relevant technology is that the manufacturing accuracy of stamping parts is usually ±0.5mm, and the accuracy of fixtures is usually ±0.2mm. Simply improving the processing accuracy of parts and fixtures will significantly increase the manufacturing cost of the body.

[0025] The first choice is to address the problems of Z-down sinking caused by the weight of the side panel (about 50kg), welding slag / burrs increasing the friction between the side panel and the floor, and deformation of the positioning holes caused by forced positioning of the fixture.

[0026] See Figure 2-Figure 5 , a vehicle body assembly equipment is proposed, which includes: The bottom plate clamp 2 is used to be fixed on the ground and used to position the floor; the bottom plate clamp 2 is provided with a slide and a floating platform 3 on both sides in the width direction of the vehicle body; the floating platform 3 is used to be set directly under the side panel; there are three slides, and they correspond to the front, middle and rear sides of the side panel respectively; each slide is provided with a telescopic part; one telescopic part is connected to one side panel clamp 4; the telescopic part is telescopic in the width direction of the vehicle.

[0027] The side panel clamp 4 is provided on a slide and moves along the width direction of the vehicle body; The front and rear windshield fixtures 1 are provided with a side panel target connection area; the side panel target connection area is the position on the side panel where the top of the side panel fixture 4 corresponds to after the vehicle body is assembled. The front and rear windshield fixtures 1 include an upper front fixture 100 and an upper rear fixture 101; The floating platform 3 provides Z-axis support for the side panels, balancing their Z-axis gravity. Rollers 303 also reduce X-axis friction between the side panels and the floor caused by welding slag and burrs, preventing deformation caused by hard obstructions. The floating platform 3 automatically descends only when encountering protrusions; under normal circumstances, it remains stationary.

[0028] In some preferred embodiments, in order to solve the precision conflict when the manipulator and the fixture act simultaneously, and the precision failure caused by the mismatch of the positioning pin gap, the following instructions are provided: First, the front and rear windshield clamps 1, the bottom plate clamp 2 and the side panel clamp 4 each include a clamp body 5 and a clamp positioning pin 8; The clamp body 5 is provided with a rotating clamping block 6, and a positioning block 7 of a designed length is provided between the clamping block 6 and the clamp body 5; a clamping space is formed between the positioning block 7 and the clamping block 6. Figure 3 As shown, there may be two positioning blocks 7 and two clamping blocks 6; the design length of the positioning blocks 7 is changed according to different requirements.

[0029] The above floating effect also has the following effects: it makes it easy to adjust the position of the side panel in the Z direction; the rolling friction of the roller 303 reduces the friction between the side panel and the floor in the X direction, and the fixture positioning pin 8 can easily pass through the positioning hole.

[0030] The diameter of the side panel clamp 4's locating pin 8 is smaller than the corresponding locating hole in the vehicle body, and larger than the diameter of the gripper locating pin of the pre-installed side panel gripper. The above description specifically addresses the locating pin 8 of the side panel clamp 4 because the positioning accuracy of the base plate can be guaranteed without being affected by gravity. The core of this application is to ensure the positioning accuracy of the side panel, thereby achieving the positioning accuracy of the entire vehicle body. Therefore, the locating pin 8 of the side panel clamp 4 is specifically limited.

[0031] like Figure 3 As shown, the diameter of the fixture locating pin 8 is 0.2mm smaller than the side panel's locating hole, and the diameter of the gripper locating pin of the side panel gripper is 0.5mm smaller than the locating hole. This avoids precision conflicts between the side panel gripper and the fixture locating pin, ensuring that the fixture locating pin serves as the final reference. In other words, as the fixture locating pin 8 slides along the slide, it adjusts the side panel to align the locating hole with it. The positions of the slide and fixture locating pin 8 are pre-designed and can remain unchanged for the same vehicle body structure.

[0032] In some preferred embodiments, the floating platform 3 includes a base 300, a support rod 301 is provided on the base 300, and a horizontal rod 302 is hinged at the top of the support rod 301; a roller 303 is provided in the middle of the horizontal rod 302; a vertical elastic member 304 is provided at the end of the horizontal rod 302 away from the support rod 301; the elastic member 304 is installed on the top of the base 300.

[0033] Alternatively, the floating platform 3 includes a base 300 , an elastic member 304 is provided on the top of the base 300 ; a horizontal plate 305 is provided on the top of the elastic member 304 ; and a roller 303 is provided on the horizontal plate 305 .

[0034] This application also proposes a process method for improving the forming accuracy of a vehicle body, which is applicable to the overall assembly welding process of the vehicle body and includes the following steps: Step 100: Provide the above vehicle body assembly equipment; Step 200: Place the base plate on the base plate fixture 2 to complete the base plate positioning; Step 300: Use the side panel mechanical gripper to pre-install the side panel so that the bottom of the side panel contacts the floating platform 3; then move the side panel clamp 4 to position and clamp the side panel; the side panel mechanical gripper is marked as Figure 2 g in; Step 400: After connecting the front and rear windshield fixtures 1 to the top cover, use the top cover mechanical gripper to pre-install the side panels in place; then connect the top of the side panel fixture 4 to the target connection area of ​​the side panels of the front and rear windshield fixtures 1. Figure 2 The f in.

[0035] The above is based on the floor. After pre-installing the side panel, the side panel is accurately positioned through the side panel clamp 4 and the slide. Then, after pre-installing the top cover, the top of the side panel clamp 4 is directly connected to the side panel target connection area of ​​the front and rear windshield clamps 1. Therefore, there is no need to improve the processing accuracy of parts and clamps. The assembly accuracy of the entire body assembly can be achieved by only ensuring the side panel positioning accuracy through the body assembly equipment.

[0036] Regarding the above, it should be noted that: To further reduce the precision mismatch between the manipulator and the fixture, the motion control programs of the fixture and the manipulator need to be matched. When the side panel fixture 4 reaches the final 5.0mm in the Y direction, it stops moving. At this time, the side panel gripper (the manipulator is generally driven and controlled by an industrial robot) is completely removed from the vehicle body. The various surfaces of the pre-assembled floor, left / right side panels, and roof cover of the vehicle body support each other, and some positioning elements of the fixture (such as locating pins) have constrained the parts. The various sub-assemblies of the vehicle body can basically maintain their posture. Then, the side panel fixture 4 continues to move closer in the Y direction by 5.0mm, and is clamped after it is fully in place, accurately positioning the side panels, roof cover, etc. Finally, all the sub-assemblies of the entire vehicle body are precisely positioned and clamped, and the vehicle body welding can begin.

[0037] In some preferred embodiments, the side panel includes an inner panel 9 and an outer panel 10; the outer panel 10 is positioned as a flange hole; Reinforced welding points 11 are provided between the inner plate 9 and the outer plate 10 and around the flanged holes.

[0038] The outer panel 10 has high precision and low strength, while the inner panel 9 of the side panel has high strength and low precision. During the welding process of the outer panel 10 and the inner panel 9, reinforced weld points 11 are added near the positioning holes to combine the strength and precision of the inner and outer panels, effectively transferring the precision of the fixture positioning pins 8 of the side panel fixture 4 to the entire side panel.

[0039] The positioning holes in the outer panel 10 are designed as flanged holes with a diameter of φ25.2, a flange height of 3.0mm, and an inner flange radius of 1.0mm. This flanged hole structure strengthens the side panel's positioning hole edges, preventing deformation when the fixture's positioning pins 8 enter, and improving positioning accuracy.

[0040] In some preferred embodiments, the front and rear windshield clamps 1 , the bottom plate clamp 2 and the side panel clamp 4 each include a clamp body 5 and a clamp positioning pin 8 ; The front end of the clamp positioning pin 8 is a tapered guide portion, and the cylindrical surface is an effective positioning portion; when the side panel is positioned, the effective positioning portion of the clamp positioning pin 8 of the side panel clamp 4 is penetrated by a flanging hole.

[0041] The front end of the fixture positioning pin 8 is guided by the cylindrical surface as the effective positioning surface, and the effective surface length is designed to extend 10.0mm beyond the flange of the side positioning hole. Ensure that when the Y direction is approached, the fixture positioning pin 8 has penetrated the positioning hole before the positioning block 7 is squeezed.

[0042] In some preferred embodiments, a rotating clamping block 6 is provided on the clamp body 5, and a positioning block 7 of a designed length is provided between the clamping block 6 and the clamp body 5; a clamping space is formed between the positioning block 7 and the clamping block 6; There is a design difference between the clamping space value of the side panel clamp 4 and the total thickness of the inner panel 9 and the outer panel 10; the clamping space value is the gap value between the clamping block 6 and the positioning block 7, and the clamping space value is Figure 3 The mark e in .

[0043] During debugging, the gap between the clamping block 6 and the positioning block 7 is adjusted to 0.1mm more than the total thickness of the inner and outer plates of the side panel. In this way, the local surface rebound of thin plate parts such as the outer plate 10 of the side panel is avoided, which affects the accuracy of the overall positioning of the fixture, allowing the steel plate to adapt freely in the non-positioning direction, thereby improving the accuracy of other positioning directions.

[0044] Through all the above explanations, in the overall body welding process, the accuracy of key points of the body is improved from ±1.0mm to ≤±0.5mm; the goal is achieved based on the part accuracy of ±0.5mm and the fixture accuracy of ±0.2mm, without the need to upgrade the basic manufacturing accuracy; the positioning adjustment time is shortened by 30%, and the tooling life is extended by 2 times.

[0045] Taking the main assembly station of the body-in-white of a certain SUV model as an example, the implementation process of the present invention is described in detail: ① After the bottom plate is positioned, the side panels are pre-installed and positioned: The side panel mechanical gripper grabs the left side panel assembly (weight 52kg) and uses a locating pin with a diameter of Φ24.7mm (the locating hole diameter of the side panel is Φ25.2mm, with a gap of 0.5mm) to insert it into the locating hole of the floor; then all the clamping blocks are loosened, and the position is maintained only by the fixture locating pin 8, releasing the freedom to facilitate subsequent adjustments.

[0046] ②Clamps move closer in sections: The side panel fixture 4 moves along the ground slide in the Y direction, and the speed is set to 200~300mm / s; When it is detected that the fixture is 5.0mm±0.5mm away from the target position, it stops; at this time, the floor is fixed by the bottom fixture, and the side panels are supported by the gripper positioning pins to maintain the posture.

[0047] Side panel mechanical gripper evacuation: After receiving the evacuation signal, the side panel gripper completely withdraws from the vehicle body area along the preset avoidance trajectory; ③ Precision positioning and locking of fixture: The side panel fixture 4 moves the remaining 5.0 mm at a low speed of 50 mm / s, and the following actions occur simultaneously: The fixture locating pin (Φ25.0mm, 0.2mm clearance) penetrates the side panel flange hole (Φ25.2mm). The flange structure effectively suppresses hole deformation (measured deformation ≤0.05mm). The floating platform 3 compensates for the Z-direction sinking of the side panel due to gravity. The roller 303 converts the X-direction sliding friction into rolling friction. The effective cylindrical surface of the fixture locating pin 8 extends 10.0mm from the flange hole to ensure that the guidance is completed before the Y-direction clamping block contacts the side panel.

[0048] The clamping block is closed and the gap with the side steel plate is set to 1.6mm, allowing the plate to rebound.

[0049] ④ After connecting the front and rear windshield fixtures 1 to the top cover, use the top cover mechanical gripper to pre-install the side panels into place. Then, connect the top of the side panel fixture 4 to the target connection area of ​​the side panels of the front and rear windshield fixtures 1. The connection can be made by snapping, pinning, or strong magnetic connection.

[0050] ⑤Welding execution.

[0051] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0052] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0053] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A vehicle body assembly equipment, characterized in that: It includes: A bottom plate fixture (2) is used to be fixed on the ground and used to position the floor; the bottom plate fixture (2) is provided with a sliding platform and a floating platform (3) on both sides in the width direction of the vehicle body; the floating platform (3) is used to be arranged directly below the side panel and has a roller (303) in contact with the side panel; A side panel clamp (4) is arranged on the slide and moves along the width direction of the vehicle body; The front and rear windshield clamps (1) are provided with a side panel target connection area; the side panel target connection area is the position on the side panel corresponding to the top of the side panel clamp (4) after the vehicle body is assembled.

2. The vehicle body assembly assembly equipment according to claim 1, characterized in that: The front and rear windshield clamps (1), the bottom plate clamp (2) and the side panel clamp (4) all include a clamp body (5) and a clamp positioning pin (8); The clamp body (5) is provided with a rotating clamping block (6), and a positioning block (7) of a designed length is provided between the clamping block (6) and the clamp body (5); a clamping space is formed between the positioning block (7) and the clamping block (6).

3. The vehicle body assembly assembly equipment according to claim 2, characterized in that: The diameter of the clamp locating pin (8) of the side panel clamp (4) is smaller than the diameter of the corresponding locating hole on the vehicle body, and larger than the diameter of the gripper locating pin of the pre-installed side panel mechanical gripper.

4. The vehicle body assembly assembly equipment according to claim 1, characterized in that: The floating platform (3) includes a base (300), a support rod (301) is provided on the base (300), and a horizontal rod (302) is hinged to the top of the support rod (301); the roller (303) is provided in the middle of the horizontal rod (302); a vertical elastic member (304) is provided at one end of the horizontal rod (302) away from the support rod (301); and the elastic member (304) is installed on the top of the base (300).

5. The vehicle body assembly assembly equipment according to claim 1, characterized in that: The floating platform (3) comprises a base (300), an elastic member (304) is provided on the top of the base (300), a horizontal plate (305) is provided on the top of the elastic member (304), and the roller (303) is provided on the horizontal plate (305).

6. The vehicle body assembly assembly equipment according to claim 1, characterized in that: There are three slides, which correspond to the front, middle and rear sides of the side panel respectively; each slide is provided with a telescopic member; one telescopic member is connected to one side panel clamp (4); and the telescopic member is telescopic in the vehicle width direction.

7. A process for improving the molding accuracy of a vehicle body, characterized in that: It includes the following steps: Providing a vehicle body assembly assembly device according to any one of claims 1 to 6; The bottom plate is placed on the bottom plate fixture (2) to complete the bottom plate positioning; The side panel is pre-assembled into position using a side panel mechanical gripper so that the bottom of the side panel contacts the floating platform (3); and the side panel clamp (4) is then moved to position and clamp the side panel; After the front and rear windshield fixtures (1) are connected to the top cover, the side panels are pre-assembled into place using the top cover mechanical gripper; and then the top of the side panel fixture (4) is connected to the side panel target connection area of ​​the front and rear windshield fixtures (1).

8. The process for improving the forming accuracy of a vehicle body according to claim 7, characterized in that: The side panel comprises an inner panel (9) and an outer panel (10); the outer panel (10) is positioned as a flanging hole; Reinforced welding points (11) are provided between the inner plate (9) and the outer plate (10) and around the flanged holes.

9. The process for improving the forming accuracy of a vehicle body according to claim 8, characterized in that: The front and rear windshield clamps (1), the bottom plate clamp (2) and the side panel clamp (4) all include a clamp body (5) and a clamp positioning pin (8); The front end of the clamp positioning pin (8) is a tapered guide portion, and the cylindrical surface is an effective positioning portion; when the side panel is positioned, the effective positioning portion of the clamp positioning pin (8) of the side panel clamp (4) is passed through the flanging hole.

10. The process for improving the forming accuracy of a vehicle body according to claim 9, characterized in that: The clamp body (5) is provided with a rotating clamping block (6), and a positioning block (7) of a designed length is provided between the clamping block (6) and the clamp body (5); a clamping space is formed between the positioning block (7) and the clamping block (6); There is a designed difference between the clamping space value of the side panel clamp (4) and the total thickness of the inner panel (9) and the outer panel (10); the clamping space value is the gap value between the clamping block (6) and the positioning block (7).

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