A tool and method for automatic centering and predeflection of a body assembly chassis

Abstract

The application discloses a kind of car body total assembly chassis fall installation automatic centering and prefabricated deflection tool and method, including flexible support column, support, top pressure device and position adjusting device;Flexible support column is set multiple, multiple flexible support column is supported in the bottom of the two side beams of chassis;Support, top pressure device, including the beam that is driven to lift by driving device, two moving seats are set in the top of the beam, and two moving seats are driven to move in the width direction of chassis along the beam by transverse transmission device relative or towards each other;Supporting platform is provided on the outside of each moving seat, and horizontal driving device is also installed on the moving seat, and the end of the driving rod of horizontal driving device is provided with a top tight piece, and the top tight piece is provided with a pressure piece that moves up and down, and the supporting platform supports the bottom of the lower surface of side beam, and the top tight piece is tightly pressed to the web of side beam, and the pressure piece is tightly pressed to the lower surface of side beam;Position adjusting device is used to adjust the position of chassis.

Description

Technical Field

[0001] This invention belongs to the field of vehicle chassis assembly, specifically relating to a tooling and method for automatic alignment and pre-fabrication of the chassis assembly for vehicle body assembly. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] With the continuous improvement of intelligent, flexible, and precision manufacturing concepts, specialized assembly tooling solutions are gradually being replaced by universal solutions. Railway passenger cars, subways, high-speed trains, and rubber-tired cars encompass the manufacturing of car bodies of various sizes. The main tooling for the overall car body assembly is support tooling. Each time, depending on the different length, width, and deflection dimensions of the underframe, manual adjustment of the support tooling and prefabricated deflection bracing are required, resulting in significant waste of human and material resources. Furthermore, manual operation and center positioning are prone to deviations, which can accumulate and hinder car body assembly. This situation arises against the backdrop of vigorously promoting quality improvement, efficiency enhancement, and automated assembly. For example, in patent CN... Paper 202110004848.1 discloses a vehicle body assembly underframe deflection prefabrication device, method, vehicle body underframe, and vehicle body; wherein the vehicle body assembly underframe deflection prefabrication device includes a support mechanism, which is set at a preset support point at the bottom of the underframe and is used to determine the underframe reference plane and the difference between each deflection prefabrication part and the reference plane; a deflection measuring mechanism, which is used to calibrate the deflection of each deflection prefabrication part; a locking mechanism, which is symmetrically fixed on both sides of the deflection prefabrication part of the underframe; the locking mechanism has tension self-locking property; the locking mechanism is in the shape of scissor clamps, and the two scissor clamps of the locking mechanism are used to engage and fix on the upper and lower surfaces of the underframe, and the lower ends of the two scissor clamps are provided with through holes; a tensioning mechanism. It is connected to the locking mechanism to generate a downward constraint force to fix the chassis and maintain the pre-fabricated deflection. The tensioning mechanism includes a second base with an adjustable pull rod on it. The pull rod has a hook that engages with a through hole to apply a downward load to the locking device through the adjustable height of the pull rod. In this chassis deflection prefabrication device, the chassis support relies on manual adjustment of the column height and operation of the locking mechanism, which cannot achieve automatic prefabrication of deflection. Furthermore, the positions of the support and hook cannot be flexibly adjusted, and the chassis support point and clamping point are not in the same position, causing localized tension deformation. The locking mechanism's point of action is at the crossbeam position, not in the chassis side beam area where the overall deflection is prepared. This device cannot guarantee the chassis's symmetry with the tooling center during installation and cannot achieve lateral movement, resulting in a large installation deviation and failing to guarantee the accuracy of automatic welding operations after assembly. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a tooling and method for automatic centering and pre-forming deflection during the installation of the chassis frame of a vehicle body assembly. This device, through the flexible movement, support, clamping, and top-tightening functions of the tooling, achieves pre-forming of deflection and automatic centering of the chassis frame during installation for different vehicle models in the vehicle body assembly process. It solves the problem of adjusting tooling when switching between vehicle models, realizes rapid center positioning during chassis frame installation, and ensures installation accuracy and consistency of reference. This invention can save the cost of adjusting tooling when switching between vehicle models, improve chassis frame installation efficiency, and, after improving installation accuracy, achieve consistency in vehicle body assembly manufacturing and eliminate the need for installation grinding.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0006] In a first aspect, the present invention provides a tooling for automatic centering and pre-deformation of the chassis frame of a vehicle body assembly, comprising a base and flexible support columns, supports, a top clamping device, and a position adjustment device disposed on the base.

[0007] Multiple flexible support columns are provided, and these flexible support columns are supported at the bottom of the two side beams of the base frame;

[0008] The aforementioned support and top clamping device includes a crossbeam whose lifting and lowering is driven by a drive device. Two movable seats are provided on the top of the crossbeam. The two movable seats move relative to each other or towards each other along the width direction of the base frame under the drive of a transverse transmission device. A support platform is provided on the outer side of each movable seat. A horizontal drive device is also installed on the movable seat. A clamping member is provided at the end of the drive rod of the horizontal drive device. A pressing member that moves up and down is provided on the clamping member. The support platform supports the bottom of the lower flange of the side beam. The clamping member clamps the web of the side beam. The pressing member presses the lower flange of the side beam.

[0009] The position adjustment device is used to adjust the position of the base frame.

[0010] This invention achieves automatic centering and rapid deflection preparation of the underframe during vehicle body assembly by using flexible support columns, supports, top clamping devices, and combinations of supports and top clamping devices. This ensures the central symmetry, automation, and arbitrary pre-fabricated deflection of components during vehicle body assembly.

[0011] As a further technical solution, the top of the support platform is provided with a support portion higher than its top surface, and the support portion supports the bottom of the side beam.

[0012] As a further technical solution, a guide is also provided on the top of the movable seat to guide the movement of the clamping member.

[0013] As a further technical solution, the drive device includes two liftable support columns, which are supported at both ends of the crossbeam.

[0014] As a further technical solution, the aforementioned transverse transmission device is a dual-axis linear drive motor, which drives the two moving seats to move outward or inward.

[0015] As a further technical solution, the flexible support column includes a liftable column, which can move in three directions: X, Y, and Z.

[0016] As a further technical solution, an elastic washer is provided at the top of the liftable column.

[0017] As a further technical solution, the position adjustment device includes a support frame with two support seats on the support frame. Each support seat has a vertical lifting column, and the top of the vertical lifting column has a support plate. A Y-axis adjustment device and an X-axis adjustment device are provided on the support plate. The Y-axis adjustment device and the X-axis adjustment device adjust the movement of a universal wheel, and the bottom of the universal wheel has several universal rotating balls.

[0018] As a further technical solution, in this embodiment, the Y-axis adjustment device includes an adjustment seat and a bolt adjustment device that cooperates with the adjustment seat.

[0019] As a further technical solution, the X-axis adjustment device includes an adjustment seat and a bolt adjustment device that cooperates with the adjustment seat.

[0020] As a further technical solution, the two vertical lifting devices are driven by the same drive.

[0021] As a further technical solution, the position adjustment device is located at the air spring position of the base frame sleeper beam.

[0022] As a further technical solution, the support and top clamping devices are located at the transverse center of the base frame and the sides of the side beams, respectively.

[0023] Secondly, embodiments of the present invention provide a method for centering and pre-setting the deflection of the underframe using the aforementioned tooling for automatic centering and pre-setting deflection of the vehicle body assembly underframe, specifically including the following steps:

[0024] Step 1: Based on the vehicle model, the program automatically adjusts the position and support height of the flexible support column of the chassis, and requires that the height of the flexible support column at this time be lower than the height of the chassis position adjustment device.

[0025] Step 2: Lower the base frame onto the position adjustment device. The position adjustment device is used to adjust the horizontal and vertical positions of the base frame to ensure that the longitudinal center line of the base frame coincides with the longitudinal center line of the tooling, and the deviation between the horizontal center and the horizontal center of the tooling is less than the set value.

[0026] Step 3: The flexible support column and support, and the top pressing device at the position of the bolster beam are raised to the zero deflection point (the height of the position adjustment device is the zero point) for upper and lower pressing and central symmetrical pressing and fixing;

[0027] Step 4: Raise and lower other flexible support columns and the central support and top clamping device according to the pre-set deflection to form the predetermined deflection.

[0028] The beneficial effects of the above embodiments of the present invention are as follows:

[0029] 1. This invention, through the cooperation of flexible support columns and support, top pressing device, and position adjustment device, can realize the pre-fabrication of deflection and automatic centering of the chassis when different vehicle models are dismounted during the final assembly of the vehicle body. It solves the problem of tooling adjustment when switching between vehicle models, realizes rapid center positioning of chassis dismounting, ensures the uniformity of dismounting accuracy and benchmark, and the entire tooling has strong versatility. This invention can be applied to the rapid dismounting and pre-fabrication of chassis of different vehicle models with different lengths, widths, and deflections.

[0030] 2. The flexible support column, support, top pressing device, position adjustment device, etc. of the present invention can all achieve flexible position adjustment.

[0031] 3. The locking position of the support and top pressing device of the present invention is at the side beam position of the base frame, and the support point and pressing point of the support and top pressing device are at the same position, so it will not cause local deformation.

[0032] 4. The present invention, through the position adjustment device, can achieve accurate positioning of the base frame, realize high-precision center-symmetrical unloading, with small unloading deviation, and ensure the accuracy of automatic welding operation.

[0033] 5. This invention is easy to operate, eliminating manual adjustment and fixing, and realizing one-click installation of the base frame. Attached Figure Description

[0034] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0035] Figure 1 This is a schematic diagram of the invention in use;

[0036] Figure 2 This is a schematic diagram of the structure of the base frame of the present invention;

[0037] Figure 3 This is a schematic diagram of the flexible support column of the present invention;

[0038] Figure 4 This is a schematic diagram of the support and pressing device of the present invention;

[0039] Figure 5 This is a schematic diagram of the pressing part of the support and pressing device of the present invention;

[0040] Figure 6 This is a schematic diagram of the clamped and unclamped parts of the edge beam.

[0041] Figure 7 This is a schematic diagram of the position adjustment device of the present invention;

[0042] Figure 8 This is a schematic diagram of the position adjustment device of the present invention in use;

[0043] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0044] 1 base frame, 11 side beams;

[0045] 2 bases;

[0046] 3 Flexible support column, 31 Liftable support column, 32 Servo motor, 33 Screw drive system, 34 Mounting base;

[0047] 4 Support, top clamping device, 41 Hydraulic device, 42 Support platform, 43 Lateral transmission device, 44 Lifting support column, 45 Mounting seat, 46 Screw transmission device, 47 Crossbeam, 48 Moving seat, 49 Top clamping component;

[0048] 5. Position adjustment device; 51. Support frame; 52. Support base; 53. Vertical lifting column; 54. Support plate; 55. Y-axis adjustment device; 56. X-axis adjustment device; 57. Mounting base; 58. Universal wheel. Detailed Implementation

[0049] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0050] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0051] For ease of description, the words "up," "down," "left," and "right" appearing in this invention only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings themselves, and do not limit the structure. They are merely for the purpose of facilitating the description of this invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] Terminology Explanation: The terms "installation," "connection," "linking," and "fixing" in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction relationship between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this invention proposes a tooling and method for automatic alignment and pre-fabrication of the chassis frame of a vehicle body assembly.

[0054] In this embodiment, for ease of description, the width direction of the base frame is defined as the Y direction, the length direction of the base frame is defined as the X direction, and the height direction of the base frame is defined as the Z direction.

[0055] In a typical embodiment of the present invention, such as Figure 1 The diagram shown is a schematic of the automatic centering and prefabricated deflection fixture for the chassis assembly in use. The assembly includes a base 2, several flexible support columns 3, a support, a top clamping device 4, and a position adjustment device 5, as detailed below:

[0056] On the base 2, along the width direction of the base frame 1, two rows of flexible support columns 3 are arranged. Each row of flexible support columns 3 includes multiple flexible support columns 3 arranged sequentially along the length direction of the base frame 1. In each row of flexible support columns 3, and between some adjacent flexible support columns 3, a support and pressing device 4 and a base frame position adjustment device 5 are also provided. The base frame position adjustment device 5 is used to adjust the position of the base frame. It can adjust the position of the base frame in three directions: X, Y, and Z. After adjusting the position of the base frame, the position of the base frame is fixed. The support and pressing device 4 can simultaneously support, press, and press the two side beams of the base frame. That is, the support, pressing, and pressing of the two side beams can be achieved by using one support and pressing device 4. The flexible support columns 3 are mainly used to support the bolster beams and side beams of the base frame.

[0057] Through the cooperation between the flexible support column 3, the support and top pressing device 4, and the position adjustment device 5, the pre-fabrication of deflection and automatic centering of the chassis of different models can be realized during the final assembly of the vehicle body. This solves the problem of adjusting the tooling when switching between models, realizes the rapid center positioning of the chassis, ensures the uniformity of the installation accuracy and benchmark, and the entire tooling has strong versatility. This invention can be applied to the rapid installation and pre-fabrication of chassis of different models with different lengths, widths, and deflections.

[0058] The aforementioned flexible support column 3, support, top pressing device 4, and position adjustment device 5 can all achieve flexible position adjustment. Through the position adjustment device 5, this invention enables accurate positioning of the base frame, achieving high-precision, centrally symmetrical installation with minimal installation deviation, thus ensuring the accuracy of automated welding operations.

[0059] It should be further explained that the number of flexible support columns 3, supports, and top clamping devices 4 is determined according to the length of the base frame. In this embodiment, three supports and top clamping devices 4 are provided. The three supports and top clamping devices 4 are located at the longitudinal center of the base frame and the edges of the two side bolster beams, respectively. The middle of the base frame crossbeam is the point of highest deflection, and the bolster beam position is the point of zero deflection. The clamping is performed to achieve the pre-fabricated theoretical deflection.

[0060] It should be further explained that the aforementioned position adjustment device 5 is set at the position of the bolster beam air spring, which is the zero deflection point. The bolster beam can be moved horizontally and vertically and pre-fixed by the position adjustment device 5.

[0061] Furthermore, such as Figure 2 As shown, the aforementioned flexible support column 3 includes a liftable support column 31, a servo motor 32, a screw drive system 33, and a mounting base 34 with an adjustment groove. The screw drive system 33 is mounted on the top of the mounting base 34. The screw drive system 33 is driven by the servo motor and is connected to the liftable support column 31, allowing the liftable support column 31 to rise and fall. Through the adjustment groove on the mounting base 34, the screw drive system 33 can move in the Y direction, and the screw drive system 33 can move the liftable support column 31 in the X direction. The liftable support column 31 can rise and fall in the Z-axis direction. Therefore, the flexible support column 3 can achieve the lifting and lowering movement of the support point in the X, Y, and Z axes, thus providing lower support.

[0062] More specifically, the liftable support column 31 in this embodiment can be a hydraulically driven support rod or a servo-driven vertical lifting support rod. The servo-driven vertical lifting support rod used in this embodiment includes an inner rod and an outer cylinder. The inner rod and the outer cylinder are threaded together. The outer cylinder is driven to rotate by a servo motor 32 to realize the vertical lifting of the inner rod.

[0063] Furthermore, an elastic washer is installed at the top of the support rod to prevent the support rod from directly contacting the base frame and causing wear to the base frame.

[0064] Furthermore, the bottom of the aforementioned liftable support column 31 is equipped with a base plate, which is connected to the slider of the lead screw transmission system 33 by bolts to achieve installation on the lead screw transmission system. The drive device of the liftable support column 31 is also installed on the base plate.

[0065] Furthermore, the mounting base 34 with adjustment slots includes a mounting base body, on which several adjustment slots are provided along the Y-axis direction, and a U-shaped through slot is provided on the lead screw transmission system 33. The bolt passes through the U-shaped through slot and cooperates with the adjustment slot on the mounting base body to realize the fixation and position adjustment of the lead screw transmission system 33 on the mounting base 34, thereby realizing the adjustment of the flexible support column 3 in the Y-axis direction.

[0066] like Figure 3 As shown, the support and top-pressing device 4 in this embodiment includes a hydraulic device 41, a support platform 42, a transverse transmission device 43, a lifting support column 44, a mounting base 45, a screw transmission device 46, a crossbeam 47, a movable base 48, and a pressing member 49. The locking position of the support and top-pressing device of the present invention is at the side beam position of the base frame, and the support point and pressing point of the support and top-pressing device are at the same position, so no local deformation will be caused. Furthermore, there are two mounting bases 45, which are independently set. Each mounting base 45 is provided with a lifting support column 44. 4. It can be raised and lowered in the Z-axis direction. Two lifting support columns 44 support the same crossbeam 47, and two movable seats 48 are provided on the top of the crossbeam 47. The two movable seats 48 can move relative to each other or towards each other in the Y direction along the crossbeam under the drive of the transverse transmission device 43. A support platform 42 and a hydraulic device 41 are provided on the outer side of each movable seat 48. A clamping member 49 is provided at the end of the drive rod of the hydraulic device 41. The clamping member 49 cooperates with the support platform 42. When the clamping member 49 moves towards the support part of the support platform, it achieves the clamping of the side beam of the base frame.

[0067] Specifically, a schematic diagram showing the mating positions of the clamping component and the support platform, such as... Figure 4 As shown; a support part 421 is provided on the top of the support platform 42, the support part 421 supports the bottom of the side beam, the end of the clamping member 49 can clamp the web of the side beam, and the clamping member 49 also includes a vertically arranged pressing block 491. The pressing part 491 can move up and down relative to the clamping member 49, and the moving pressing block 491 can press the lower flange of the side beam from top to bottom.

[0068] Furthermore, a guide 481 is provided on the top of the movable seat 48 to guide the movement of the clamping member 49;

[0069] Furthermore, the mounting base 45 is provided with a lead screw drive device 46, which is connected to the base plate of the lifting support column 44, enabling the lifting support column 44 to move in the X direction.

[0070] Furthermore, the aforementioned transverse transmission device 43 is a dual-axis linear drive motor, which drives the two movable seats 48 to move outward or inward.

[0071] That is, the supporting and pressing device 4 in this embodiment can simultaneously support, press, and press the two component side beams 11 of the base frame, such as... Figure 5 As shown, it can fix the lower flange of different underframe side beam sections (three forces: support, compression, and clamping), and adopts a transverse clamping force balanced transmission and a central symmetrical movement clamping method to achieve automatic central symmetry of underframe assembly unloading.

[0072] Furthermore, such as Figure 6 As shown, the position adjustment device 5 in this embodiment includes a support frame 51, a support base 52, a vertical lifting column 53, a support plate 54, a Y-axis adjustment device 55, an X-axis adjustment device 56, and a universal wheel 58. Two support bases 52 are mounted on the support frame 51, and each support base 52 has a vertical lifting column 53. A support plate 54 is mounted on the top of each vertical lifting column 53. The Y-axis adjustment device 55 and the X-axis adjustment device 56 are mounted on the support plate 54. The Y-axis and X-axis adjustment devices adjust the movement of a universal wheel 58. The bottom of the universal wheel 58 is provided with several universal rotating balls; the position of the universal wheel 58 can be adjusted by the Y-axis adjustment device 55 and the X-axis adjustment device 56, thereby adjusting the position of the base frame; in this embodiment, the Y-axis adjustment device 55 is installed on the side of the support plate 54, and it includes an adjustment seat and a bolt adjustment device that cooperates with the adjustment seat; the X-axis adjustment device 56 is installed on the other side of the support plate 54, and it also includes an adjustment seat and a bolt adjustment device that cooperates with the adjustment seat; it should be further noted that the two vertical lifting devices 53 are driven by the same drive.

[0073] Furthermore, the support frame 51 is mounted on two mounting seats 57 with adjustment slots, which can adjust the position of the position adjustment device 5 itself. In actual use, the Y-axis adjustment device 55 adjusts the position of the entire base frame in the Y-axis from the outside of the two side beams, and the X-axis adjustment device 56 adjusts the position of the entire base frame in the X-axis from both sides of the internal support of the base frame.

[0074] Furthermore, the aforementioned support frame 51 includes a vertical support column and a horizontally arranged support beam, and the support column and the support beam are connected by diagonal braces to form two triangular supports.

[0075] Furthermore, the support base 52 can move horizontally relative to the support beam to accommodate base frames of different widths.

[0076] Furthermore, this embodiment also discloses a method for centering and pre-setting the deflection of the underframe using the aforementioned automatic centering and pre-deflection fixture for the vehicle body assembly underframe, as detailed below:

[0077] Step 1: Based on the vehicle model, the program automatically adjusts the position and support height of the flexible support column of the chassis, and requires that the height of the flexible support column at this time be lower than the height of the chassis position adjustment device.

[0078] Step 2: Place the base frame onto the position adjustment device. Adjust the longitudinal and transverse positions of the base frame using the position adjustment device to ensure that the longitudinal center line of the base frame coincides with the longitudinal center line of the tooling, and the deviation between the transverse center and the transverse center of the tooling is less than the set value of 2mm.

[0079] Step 3: The flexible support column and support, and the top pressing device at the position of the bolster beam are raised to the zero deflection point (the height of the position adjustment device is the zero point) for upper and lower pressing and central symmetrical pressing and fixing;

[0080] Step 4: Raise and lower other flexible support columns and the central support and top clamping device according to the pre-set deflection to form the predetermined deflection.

[0081] This invention relates to a method for automatic centering and pre-deformation of deflection during the unloading of the chassis frame of a vehicle body assembly. By utilizing the flexible movement, support, clamping, and top-tightening functions of the tooling, the method achieves pre-deformation of deflection and automatic centering of the chassis frame during unloading for different vehicle models in the vehicle body assembly process. This solves the problem of adjusting tooling when switching between vehicle models, enables rapid center positioning of the chassis frame during unloading, and ensures the uniformity of unloading accuracy and reference. This invention can save the cost of adjusting tooling when switching between vehicle models, improve the efficiency of chassis frame unloading, and improve the unloading accuracy, thereby achieving consistency in the manufacturing of the vehicle body assembly and eliminating the need for unloading and refining.

[0082] Finally, it should be noted that relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tooling for automatic centering and predeflection of a body assembly frame drop installation, characterized in that, Includes flexible support columns, support-top clamping devices, and position adjustment devices; Multiple flexible support columns are provided, and these flexible support columns are supported at the bottom of the two side beams of the base frame; The aforementioned support-top clamping device includes a crossbeam whose lifting and lowering is driven by a drive device. Two movable seats are provided on the top of the crossbeam. The two movable seats move relative to each other or towards each other along the width direction of the base frame under the drive of a transverse transmission device. A support platform is provided on the outer side of each movable seat. A horizontal drive device is also installed on the movable seat. A clamping member is provided at the end of the drive rod of the horizontal drive device. A pressing member that moves up and down is provided on the clamping member. The support platform supports the bottom of the lower flange of the side beam. The clamping member clamps the web of the side beam. The pressing member presses the lower flange of the side beam. A support part is provided on the top of the support platform, which supports the bottom of the side beam. The locking position of the support-top clamping device is at the side beam position of the base frame, and the support point and the pressing point of the support-top clamping device are in the same position, so as not to cause local deformation. The position adjustment device is used to adjust the position of the base frame.

2. The tooling for automatic alignment and pre-fabrication of the vehicle body assembly underframe as described in claim 1, characterized in that, A guide is also provided on the top of the movable seat to guide the movement of the clamping member.

3. The tooling for automatic centering and pre-fabrication of the vehicle body assembly underframe as described in claim 1, characterized in that, The drive device includes two liftable support columns, which are supported at both ends of the crossbeam.

4. The tooling for automatic centering and pre-fabrication of the vehicle body assembly underframe as described in claim 1, characterized in that, The lateral transmission device is a dual-axis linear drive motor, which drives two moving seats to move outward or inward.

5. The tooling for automatic centering and pre-fabrication of the vehicle body assembly underframe as described in claim 1, characterized in that, The flexible support column includes a liftable column, which can move in three directions: X, Y, and Z.

6. The tooling for automatic centering and pre-fabrication of the vehicle body assembly underframe as described in claim 1, characterized in that, The position adjustment device includes a support frame with two support seats on the support frame. Each support seat has a vertical lifting column. The top of the vertical lifting column has a support plate. The support plate has a Y-axis adjustment device and an X-axis adjustment device. The Y-axis adjustment device and the X-axis adjustment device adjust the movement of a universal wheel. The bottom of the universal wheel has several universal rotating balls.

7. The tooling for automatic centering and pre-fabrication of the vehicle body assembly underframe as described in claim 6, characterized in that, The Y-axis adjustment device includes an adjustment seat and a bolt adjustment device that cooperates with the adjustment seat.

8. The tooling for automatic centering and pre-fabrication of the vehicle body assembly underframe as described in claim 6, characterized in that, The X-axis adjustment device includes an adjustment seat and a bolt adjustment device that cooperates with the adjustment seat.

9. The tooling for automatic centering and pre-fabrication of the vehicle body assembly underframe as described in claim 6, characterized in that, Both vertical lifting columns are driven by the same drive.

10. The tooling for automatic centering and pre-fabrication of the vehicle body assembly underframe as described in claim 1, characterized in that, The position adjustment device is located at the air spring position of the base frame sleeper beam.

11. The tooling for automatic alignment and pre-fabrication of the vehicle body assembly underframe as described in claim 1, characterized in that, The support-top clamping devices are located at the transverse center of the base frame and at the edges of the side bolsters.

12. The method for centering and pre-deflecting the underframe of the vehicle body assembly underframe as described in any one of claims 1-11, characterized in that: Step 1: Automatically adjust the position and support height of the flexible support column of the chassis according to the vehicle model, and require that the height of the flexible support column at this time be lower than the height of the chassis position adjustment device; Step 2: Lower the base frame onto the position adjustment device. The position adjustment device is used to adjust the horizontal and vertical positions of the base frame to ensure that the longitudinal center line of the base frame coincides with the longitudinal center line of the tooling, and the deviation between the horizontal center and the horizontal center of the tooling is less than the set value. Step 3: The flexible support column and support-top clamping device at the bolster beam position are raised to the zero deflection point for vertical clamping and central symmetrical clamping and fixation; Step 4: Raise and lower other flexible support columns and the central support-top clamping device according to the pre-set deflection to form the predetermined deflection.

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