Cross beam machining method and cross beam assembly

Abstract

The invention discloses a cross beam machining method and a cross beam assembly, the cross beam machining method comprises the steps that S10, a rectangular plate with a first size and a second size is obtained through cutting, the first size is the size of the rectangular plate in the first direction, and the second size is the size of the rectangular plate in the second direction; s20, in the first direction, the first side of the rectangular plate is bent to form a first cavity, and the end of the first side of the rectangular plate is welded to the plate face of the rectangular plate; and S30, in the first direction, the second side of the rectangular plate is bent to form a second cavity, and the end of the second side of the rectangular plate is welded to the side wall of the first cavity. Compared with the prior art, according to the cross beam machining method, the plate is bent and machined into the cross beam body structure, the cross section of the cross beam can be flexibly adjusted so as to adapt to different vehicle types, a mold does not need to be developed, the bending rigidity and the torsional rigidity of the cross beam are improved, meanwhile, the development cost is reduced, and the adaptation period is shortened.

Description

Technical Field

[0001] This application relates to the field of automotive parts technology, and more specifically, to a method for processing a crossbeam and a crossbeam assembly. Background Technology

[0002] The chassis assembly is the core load-bearing unit of a vehicle, composed of longitudinal beams, crossbeams, connecting brackets, and other components. It supports the body, powertrain, and chassis components, transmits loads, and withstands collision forces, making it a critical structural component in body-on-frame vehicles. Crossbeams, as lateral load-bearing components of the chassis, primarily function to: connect the left and right longitudinal beams to form the chassis frame structure; support the body floor, seats, and chassis components; withstand lateral loads (such as centrifugal force during cornering) and vertical loads (such as vehicle weight); and assist in transmitting collision forces during a collision to protect the passenger compartment. With the automotive industry's increasing demands for lightweighting, multi-model platformization, and cost control, the design and manufacturing process of chassis crossbeams have become key areas for optimization.

[0003] Currently, the mainstream manufacturing methods for vehicle frame crossbeams in the industry fall into two categories: stamping and welding. Both processes are widely used in the production of crossbeams for non-load-bearing vehicle frames (such as pickup trucks and commercial vehicles). Stamped crossbeams use high-strength steel plates, which are progressively processed into a pre-defined cross-section using specialized stamping dies (blanking dies, forming dies, and punching dies). After forming, connecting lugs are welded or stamped at both ends. Welded crossbeams are assembled from multiple simple stamped parts (such as U-shaped channels, flat plates, and reinforcing plates) through arc welding or spot welding. For example, two U-shaped channels are welded together to form a closed cross-section, and then connecting lugs are welded on. This process can be adapted to different vehicle models by adjusting the spliced ​​parts, but it requires multiple welding processes, and the welded joints have a risk of strength reduction. Regardless of whether stamping or welding is used, both processes must be adapted to the spacing of the frame longitudinal beams, load requirements, and the vehicle body mounting point location. They are components in the frame assembly with extremely high vehicle model compatibility, and their performance and cost directly affect the overall vehicle competitiveness.

[0004] The existing stamping process requires the development of dedicated blanking dies, forming dies, and punching dies for each cross section (with different heights, widths, and mounting hole positions), resulting in high mold costs. If the vehicle model is iterated or a new model is added (such as pickup trucks with different wheelbases), the molds need to be redeveloped, leading to a long development cycle.

[0005] Therefore, how to improve the adaptability of crossbeams to different vehicle models has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The first aspect of this application is to disclose a method for processing crossbeams to improve the adaptability of crossbeams to different vehicle models.

[0007] A method for processing a crossbeam, comprising:

[0008] S10. A rectangular plate with a first dimension and a second dimension is obtained by cutting, wherein the first dimension is the dimension of the rectangular plate in a first direction, and the second dimension is the dimension of the rectangular plate in a second direction;

[0009] S20. Along the first direction, the first side of the rectangular plate is bent to form a first cavity, and the end of the first side of the rectangular plate is welded to the surface of the rectangular plate.

[0010] S30. Along the first direction, the second side of the rectangular plate is bent to form a second cavity, and the end of the second side of the rectangular plate is welded to the side wall of the first cavity.

[0011] In one possible implementation, step S20 specifically involves: forming the first cavity by bending the first side of the rectangular plate three times along the first direction, and welding the end of the first side of the rectangular plate to the surface of the rectangular plate.

[0012] In one possible implementation, in step S20, the first side of the rectangular plate is bent three times to form a first bent portion, a second bent portion, and a third bent portion, and the unbent portion of the rectangular plate is the plate substrate.

[0013] The first bent portion is connected to the plate substrate, the second bent portion is connected to the first bent portion, and the third bent portion is connected to the second bent portion, so that the first bent portion, the second bent portion, the third bent portion and the plate substrate form the first cavity.

[0014] In one possible implementation, the end of the third bend is bent to form a first welding edge, which is welded to the plate substrate.

[0015] In one possible implementation, step S30 specifically involves: forming a second cavity by bending the second side of the rectangular plate twice along the first direction, and welding the end of the second side of the rectangular plate to the third bend.

[0016] In one possible implementation, in step S30, the second side of the rectangular plate is bent twice to form a fourth bend and a fifth bend, respectively.

[0017] The fourth bend is connected to the substrate, and the fifth bend is connected to the fourth bend, so that the fourth bend, the fifth bend, the third bend, and the substrate form the second cavity.

[0018] In one possible implementation, the end of the fifth bend is bent to form a second welding edge, which is welded to the third bend.

[0019] In one possible implementation, step S40 is also included:

[0020] The two ends of the crossbeam are bent to form a first connecting section and a first connecting segment, which are used to connect with the longitudinal beam of the vehicle frame.

[0021] The crossbeam processing method disclosed in this application involves processing a rectangular sheet metal into a crossbeam through multiple bends. Only the processing parameters need to be adjusted, such as the position and length of each bend, to adapt to the crossbeam cross-section of different vehicle models, eliminating the need to develop dedicated stamping dies. When multiple vehicle models are platformized, only one production line is required, meeting the rapid iteration needs of multiple models and indirectly reducing the platformization cost of the chassis assembly. Furthermore, the processed crossbeam achieves high mechanical strength without the need for additional welded reinforcing plates. The crossbeam weight is significantly reduced compared to traditional stamped and welded crossbeams, meeting the lightweight requirements of the entire vehicle. Additionally, the scrap rate is reduced, material utilization is improved, and material procurement costs are lowered.

[0022] Compared to related technologies, the crossbeam processing method disclosed in this application is to process the main structure of the crossbeam by bending the sheet metal. The crossbeam cross section can be flexibly adjusted to adapt to different vehicle models. There is no need to develop molds. While improving the bending and torsional stiffness of the crossbeam, it reduces development costs, shortens the adaptation cycle, and adapts to the frame assembly of multiple vehicle models.

[0023] The second aspect of this application is to disclose a crossbeam assembly.

[0024] A beam assembly, comprising:

[0025] The crossbeam is manufactured by any of the crossbeam processing methods described in the above-mentioned possible implementations;

[0026] A first connecting lug and a second connecting lug, wherein the first connecting lug is connected to one end of the crossbeam and the second connecting lug is connected to the other end of the crossbeam; both the first connecting lug and the second connecting lug are used to connect to the longitudinal beam of the vehicle frame.

[0027] The third aspect of this application is to disclose a crossbeam assembly.

[0028] A beam assembly, comprising:

[0029] The crossbeam is manufactured using the crossbeam processing method described in one of the possible implementations above.

[0030] The crossbeam assembly provided in this application is manufactured by the above-mentioned crossbeam processing method, and therefore possesses all the technical effects of the above-mentioned crossbeam processing method, which will not be repeated here. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the beam assembly disclosed in the embodiments of this application;

[0033] Figure 2 This is a schematic diagram of the structure of the beam disclosed in the embodiments of this application;

[0034] Figure 3 This is a cross-sectional view of the beam disclosed in the embodiments of this application;

[0035] Figure 4 This is a schematic diagram of the structure of the first connecting ear plate disclosed in an embodiment of this application;

[0036] Figure 5 This is a schematic diagram of the structure of the first support disclosed in an embodiment of this application;

[0037] Figure 6 This is a schematic diagram of the structure of the second support disclosed in an embodiment of this application;

[0038] Figure 7 This is a schematic diagram of the structure of the second connecting ear plate disclosed in an embodiment of this application;

[0039] Figure 8 This is a schematic diagram of the structure of the third support disclosed in the embodiments of this application;

[0040] Figure 9 This is a schematic diagram of the structure of the fourth support disclosed in the embodiments of this application;

[0041] Figure 10 This is a schematic diagram of the frame assembly disclosed in an embodiment of this application.

[0042] The attached figures are labeled as follows:

[0043] 10. Crossbeam assembly; 20. Frame longitudinal beam;

[0044] 100. Crossbeam;

[0045] 110. First cavity; 111. First bend; 112. Second bend; 113. Third bend; 114. First welding edge;

[0046] 120. Second cavity; 121. Fourth bend; 122. Fifth bend; 123. Second welding edge;

[0047] 130. Board substrate;

[0048] 140. Weight reduction hole;

[0049] 200. First connecting ear plate; 210. First bracket; 220. Second bracket;

[0050] 300. Second connecting ear plate; 310. Third bracket; 320. Fourth bracket;

[0051] 400. Plug the weld hole. Detailed Implementation

[0052] The first aspect of this application is to disclose a method for processing crossbeams to improve the adaptability of crossbeams to different vehicle models.

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0054] The beam processing method disclosed in this application includes the following steps:

[0055] Step S10: Obtain a rectangular sheet material with a first dimension and a second dimension by cutting. The rectangular sheet material includes, but is not limited to, high-strength microalloyed steel strip with a thickness of 1.5-2.0 mm and grade QSTE700TM, or hot-formed steel with a thickness of 1.2-1.8 mm and grade 1500HS. Designers can choose based on their needs. The first dimension is the dimension of the rectangular sheet material in a first direction, and the second dimension is the dimension of the rectangular sheet material in a second direction. The first direction is... Figure 2 and Figure 3 The X direction shown is the circumference direction of the cross-section of beam 100. The second direction is... Figure 2 The Y direction shown is the length direction of the beam 100.

[0056] In step S20, along the first direction (X direction), the first side of the rectangular plate is bent to form the first cavity 110, and the end of the first side of the rectangular plate is welded to the surface of the rectangular plate.

[0057] In step S30, the second side of the rectangular plate is bent from the first side to the first side along the first direction (X direction) to form a second cavity 120, and the end of the second side of the rectangular plate is welded to the side wall of the first cavity 110.

[0058] The welding of the first and second ends of the rectangular plate can be carried out by laser welding or high-frequency induction welding to achieve cavity closure and continuous weld, which significantly improves the bending and torsional stiffness and load-bearing capacity of the beam 100.

[0059] The above processing steps form a complete beam 100 structure. To improve the manufacturing precision of the beam 100, further finishing processes can be performed. For example, the beam 100 formed in the above process can be shaped using a forming device to ensure that its external dimensional accuracy meets the design requirements, and then the beam 100 can be straightened using a straightening device to ensure that its form and position accuracy meets the design requirements.

[0060] To meet the vehicle's lightweight requirements, weight-reduction holes 140 can be cut into the crossbeam using laser cutting equipment. These holes 140 can be circular or strip-shaped. Figure 1 and Figure 2 As shown.

[0061] It should be noted that hot-formed steel is used, and a hot-forming process is added after step S30, heating to 950-1000℃, holding at that temperature for 5-10 minutes, and then rapidly cooling, which increases the tensile strength of the material to 1400-1500MPa. This design can further reduce the weight of the crossbeam by 15-20% and increase its stiffness by 20-25%, making it suitable for new energy vehicles (such as electric pickup trucks) with extremely high requirements for lightweighting.

[0062] The crossbeam processing method disclosed in this application involves processing a rectangular sheet metal into a crossbeam 100 through multiple bends. Only the processing parameters need to be adjusted, such as the position and length of each bend, to adapt to the crossbeam cross-section of different vehicle models, eliminating the need to develop dedicated stamping dies. When multiple vehicle models are platformized, only one production line is required, meeting the rapid iteration needs of multiple models and indirectly reducing the platformization cost of the chassis assembly. Furthermore, the processed crossbeam 100 achieves high mechanical strength without the need for additional welded reinforcing plates. The crossbeam weight is significantly reduced compared to traditional stamped and welded crossbeams, meeting the requirements for vehicle lightweighting, while also reducing scrap rate, increasing material utilization, and lowering material procurement costs.

[0063] Compared to related technologies, the crossbeam processing method disclosed in this application is to process the main structure of the crossbeam 100 by bending the sheet metal. The cross section of the crossbeam 100 can be flexibly adjusted to adapt to different vehicle models. There is no need to develop molds. While improving the bending and torsional stiffness of the crossbeam 100, it reduces development costs, shortens the adaptation cycle, and adapts to the frame assembly of multiple vehicle models.

[0064] In a specific embodiment, step S20 is specifically as follows: Along the first direction (X direction), the first side of the rectangular plate forms the first cavity 110 through three bends. After forming the first cavity 110, it immediately enters the first welding station. At this time, the end of the first side of the rectangular plate and the unbent part of the rectangular plate are already closely adjacent. Using a welding device, the end of the first side and the plate surface of the rectangular plate are continuously welded in the second direction (Y direction), so as to completely enclose the first cavity 110 and cure it into an independent sealed cavity.

[0065] In step S20, the first side of the rectangular plate forms the first bending portion 111, the second bending portion 112, and the third bending portion 113 through three bends respectively. Relevant process parameters are preset according to the cross-sectional shape of the crossbeam 100. For example, Figure 3 as shown, taking the cross-sectional width as W and the length as H as an example. On the first side of the rectangular plate, at a distance of W from the edge of the rectangular plate, the first downward bend is made to form the third bending portion 113. Continuing on the first side of the rectangular plate, at an interval of H from the first bending position, the second bend is made. The second bend has the same direction as the first bend to form the second bending portion 112. On the first side of the rectangular plate, at an interval of W from the second bending position, the third bend is made to form the first bending portion 111. The unbent part of the rectangular plate is the plate base 130. The first bending portion 111 is connected to the plate base 130, the second bending portion 112 is connected to the first bending portion 111, and the third bending portion 113 is connected to the second bending portion 112. After three bends, finally, the first bending portion 111, the second bending portion 112, the third bending portion 113, and the plate base 130 enclose the first cavity 110. When the cross-sectional size needs to be adjusted, only the values of W and H need to be adjusted to flexibly adapt to different vehicle models.

[0066] This design adopts the step-by-step forming of three bends and welding, decomposing the complex "day" - shaped cross-section into relatively simple stage forming. The deformation amount of each step is small, and the springback is easy to control. After curing the first cavity 110 by intermediate welding, it becomes an independent closed tubular structure, which can provide strong anti-deformation support in the subsequent forming of the second cavity 120, effectively reducing the overall forming difficulty and greatly improving the dimensional accuracy, angle accuracy, and straightness of each part of the cross-section.

[0067] To improve the welding quality, the end of the third bending portion 113 can be bent to form a first welding edge 141, and the first welding edge 141 is welded to the plate substrate 130. The first welding edge 141 and the plate substrate 130 achieve a tight surface-to-surface fit at the welding point, with a uniform and controllable gap. This provides the best conditions for welding, facilitating full penetration welding to form a uniform and dense weld seam, greatly reducing the risks of incomplete penetration, porosity and other defects. The original edge of the rectangular plate may have burrs, deformation or irregularities, or may be attached with rolling scale, and this design fundamentally avoids the damage of the original edge to the weld quality. The bent short side is equivalent to forming a reinforcing rib at the butt joint, and after welding, the contact area between the first welding edge 141 and the plate substrate 130 increases, and the joint formed by the bent short side can transfer stress more smoothly than a simple flat edge joint, reducing the stress concentration coefficient. This significantly improves the fatigue strength and service life of the welded part, and enhances the load-bearing efficiency and durability of the entire component.

[0068] In a specific embodiment, the first bending portion 111 is perpendicular to the plate substrate 130, the second bending portion 112 is parallel to the plate substrate 130, and the third bending portion 113 is perpendicular to the plate substrate 130. Compared with non-standard angles, the forming roll design for 90° bending is based on a right angle, and its processing, inspection and correction are simple and clear, and the manufacturing tolerances are easier to control. Moreover, there is bound to be springback in metal cold bending, and the springback data for 90° bending are the richest and most mature in the industry, and the compensation scheme is the most reliable. For non-standard angles, the difficulty and uncertainty of springback prediction and compensation are greatly increased. The inclined third bending portion 113 will decompose part of the force and reduce the load-bearing efficiency. The perpendicular third bending portion 113 can most effectively bear the shear force and transfer the load to the plate substrate 130 and the second bending portion 112 efficiently, improving the mechanical properties of the cross beam 100.

[0069] Step S30 is specifically to form the second cavity 120 by bending twice along the first direction from the second side of the rectangular plate, and weld the end of the second side of the rectangular plate to the third bending portion 113. The rectangular plate after the first welding continues to be bent. The bending direction is towards the side where the first cavity 110 is located, so that the second side of the rectangular plate gradually approaches the outer side of the top of the first cavity 110 that has been welded, forming a prototype of the second cavity 120. When the end of the second side of the rectangular plate is in close contact with the top of the third bending portion 113, it enters the second welding station. Continuous welding is carried out again in the second direction (Y direction). This welding finally completely closes the entire cross section, forming a complete "day" - shaped double - cavity structure.

[0070] In step S30, the second side of the rectangular plate is bent twice to form a fourth bend 121 and a fifth bend 122. A first bend is performed on the second side of the rectangular plate at a distance H from the edge, forming the fifth bend 122. A second bend is then performed on the second side of the rectangular plate at a distance W from the first bend, with the second bend in the same direction as the first bend, forming the fourth bend 121. The fourth bend 121 is connected to the plate substrate 130, and the fifth bend 122 is connected to the fourth bend 121, ultimately forming a second cavity 120 with the fourth bend 121, the fifth bend 122, the third bend 113, and the plate substrate 130.

[0071] To improve welding quality, the end of the fifth bend 122 can be bent to form a second welding edge 142, which is welded to the third bend 113. The second welding edge 142 can achieve the same technical effect as the first welding edge 141, which will not be described in detail here.

[0072] In one specific embodiment, the fourth bend 121 is perpendicular to the substrate 130, and the fifth bend 122 is parallel to the substrate 130. When the first cavity 110 is bent at 90°, when the substrate of the second cavity 120 is bent down at 90°, it can fit tightly and vertically with the vertical third bend 113, and can transmit stress most smoothly.

[0073] In one specific embodiment, the three bends on the first side of the rectangular plate and the two bends on the second side each have the same bend length, which is the length along the first direction. This design positions the third bend 113 at the center of the beam 100, with the first cavity 110 and the second cavity 120 symmetrical. In mechanics of materials, the bending stiffness of a beam is proportional to the moment of inertia of its section. Placing the third bend 113 in the center provides a larger overall moment of inertia, thus offering the strongest bending stiffness and load-bearing capacity with the same amount of material. Under complex loads, the first cavity 110 and the second cavity 120 work together to provide balanced and excellent torsional stiffness. The symmetrical structure also avoids coupled bending and torsional deformation that may be caused by the misalignment of the stiffness center and the centroid.

[0074] To improve efficiency and flexibility, the bending of both the first and second sides of the rectangular sheet metal can be achieved through roll forming using a roll forming machine. The roll forming machine uses multiple sets of continuously arranged forming rolls to gradually roll the metal sheet (or strip) into a preset cross-sectional shape. It features high forming accuracy, high material utilization, and eliminates the need for specialized molds (only roll parameters need adjustment). Theoretically, roll forming generates no waste. Compared to stamping processes, which require blanking and produce scrap, roll forming offers high material utilization and significantly reduces material costs. Roll forming production lines can easily integrate online welding, online punching / cutting, online inspection, and online spraying processes, achieving highly automated integrated production.

[0075] In one specific embodiment, the crossbeam processing method further includes step S40. In step S40, the two ends of the crossbeam 100 manufactured in step S30 are bent at 90° to form a first connecting section and a second connecting section. The first connecting section and the second connecting section are respectively connected to the frame longitudinal beam 20 to form a frame assembly. Body mounting holes can be machined on the first connecting section and the second connecting section for fixing the body floor plate with bolts to form a connection between the frame assembly and the body.

[0076] The second aspect of this application is to disclose a crossbeam assembly 10, such as Figure 10 As shown, the crossbeam assembly 10 includes a crossbeam 100, a first connecting lug 200, and a second connecting lug 300. The crossbeam 100 is manufactured using any of the possible implementations described above. The first connecting lug 200 is connected to one end of the crossbeam 100, and the second connecting lug 300 is connected to the other end of the crossbeam 100. Both the first connecting lug 200 and the second connecting lug 300 are used to connect to the frame longitudinal beam 20.

[0077] See Figures 4-9 The first connecting ear plate 200 and the second connecting ear plate 300 can be composed of two interlocking upper and lower parts. The first connecting ear plate 200 includes a first bracket 210 and a second bracket 220, and the second connecting ear plate 300 includes a third bracket 310 and a fourth bracket 320. Taking the first connecting ear plate 200 as an example, during assembly, the tenon of the second bracket 220 is aligned and inserted into the tenon of the first bracket 210, and then welded, so that the first bracket 210 and the second bracket 220 are tightly engaged. At this time, the arc-shaped outer surface of the first bracket 210 and the arc-shaped outer surface of the second bracket 220 smoothly transition, together forming an integral structure with a flared cross-section. At the same time, the first bracket 210 and the second bracket 220 together form a complete channel for connecting the crossbeam 100. A plug welding hole 400 can be opened on the wall of the channel, and the first connecting ear plate 200 is welded to the crossbeam 100 through the plug welding hole 400.

[0078] This design employs a modular approach, simplifying the complex three-dimensional structure of the crossbeam assembly 10 into several relatively simple components. The first connecting lug 200 and the second connecting lug 300 can be efficiently produced using conventional stamping, casting, or small-scale forging combined with precision cutting. This reduces equipment requirements, minimizes material waste, and significantly lowers manufacturing costs, making it particularly suitable for mass production. The flared shape of the first connecting lug 200 and the second connecting lug 300 provides a smooth, gradually widening profile, offering a continuous and seamless path for force transmission. It diffuses force evenly across the wider frame longitudinal beam connection surface, starting from the connection point with the crossbeam 100. This significantly reduces peak stress, greatly improving the static strength and overload resistance of the structure. Furthermore, the flared connecting lugs utilize local arc welding and plug welding, effectively reducing welding deformation. This shell structure achieves lightweighting while maintaining strength and precision. Moreover, for different frame longitudinal beam profiles, only the mating surfaces of the connecting lugs need to be modified, making the process convenient and quick.

[0079] A third aspect of this application discloses a crossbeam assembly 10, which includes a crossbeam 100 processed in step S40. This design eliminates the need for welding connecting lugs, reducing subsequent welding processes and improving processing efficiency by 5-8%. It is suitable for structures where the cross-sectional requirements at the connection point are not significantly different from the cross-sectional requirements of the intermediate crossbeam 100, making it suitable for mass production of a single vehicle model.

[0080] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a specific order, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units may include steps or units not listed, but rather steps or units not listed. Additionally, in the description of embodiments in this application, "a plurality of" means two or more.

[0081] In the description of this application, it should be understood that the terms "height," "thickness," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used 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, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In the description of this application, "a plurality of" means two or more, and "at least one" can mean one, two, or more, unless otherwise expressly specified.

[0082] The above description of the disclosed embodiments enables those skilled in the art to make or use this 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 this application. Specific technical means in some embodiments may be incorporated, in whole or in part, into another embodiment unless explicitly excluded by another embodiment. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for processing a crossbeam, characterized in that, include: S10. A rectangular plate with a first dimension and a second dimension is obtained by cutting, wherein the first dimension is the dimension of the rectangular plate in a first direction, and the second dimension is the dimension of the rectangular plate in a second direction; S20. Along the first direction, the first side of the rectangular plate is bent to form a first cavity (110), and the end of the first side of the rectangular plate is welded to the surface of the rectangular plate. S30. Along the first direction, the second side of the rectangular plate is bent to form a second cavity (120), and the end of the second side of the rectangular plate is welded to the side wall of the first cavity (110).

2. The beam processing method as described in claim 1, characterized in that, Step S20 specifically involves: forming the first cavity (110) by bending the first side of the rectangular plate three times along the first direction, and welding the end of the first side of the rectangular plate to the surface of the rectangular plate.

3. The beam processing method as described in claim 2, characterized in that, In step S20, the first side of the rectangular plate is bent three times to form a first bent portion (111), a second bent portion (112), and a third bent portion (113), and the unbent portion of the rectangular plate is the plate substrate (130). The first bending portion (111) is connected to the plate substrate (130), the second bending portion (112) is connected to the first bending portion (111), and the third bending portion (113) is connected to the second bending portion (112), so that the first bending portion (111), the second bending portion (112), the third bending portion (113) and the plate substrate (130) form the first cavity (110).

4. The beam processing method as described in claim 3, characterized in that, The end of the third bending portion (113) is bent to form a first welding edge (141), which is welded to the plate substrate (130).

5. The beam processing method as described in claim 3, characterized in that, Specifically, step S30 involves forming a second cavity (120) by bending the second side of the rectangular plate twice along the first direction, and welding the end of the second side of the rectangular plate to the third bent portion (113).

6. The beam processing method as described in claim 5, characterized in that, In step S30, the second side of the rectangular plate is bent twice to form a fourth bend (121) and a fifth bend (122). The fourth bend (121) is connected to the plate substrate (130), and the fifth bend (122) is connected to the fourth bend (121), so that the fourth bend (121), the fifth bend (122), the third bend (113) and the plate substrate (130) form the second cavity (120).

7. The beam processing method as described in claim 6, characterized in that, The end of the fifth bend (122) is bent to form a second welding edge (142), which is welded to the third bend (113).

8. The beam processing method as described in claim 1, characterized in that, It also includes step S40: The two ends of the crossbeam (100) are bent to form a first connecting section and a first connecting segment, which are used to connect with the frame longitudinal beam (20).

9. A crossbeam assembly, characterized in that, include: The crossbeam (100) is manufactured by the crossbeam processing method as described in any one of claims 1-7; A first connecting ear plate (200) and a second connecting ear plate (300), wherein the first connecting ear plate (200) is connected to one end of the crossbeam (100) and the second connecting ear plate (300) is connected to the other end of the crossbeam (100); both the first connecting ear plate (200) and the second connecting ear plate (300) are used to connect to the frame longitudinal beam (20).

10. A crossbeam assembly, characterized in that, include: The crossbeam (100) is manufactured by the crossbeam processing method as described in claim 8.

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