Sliding plate chassis support and machining method thereof

Abstract

The invention relates to the field of product manufacturing, in particular to a sliding plate chassis support and a machining method thereof. The sliding plate chassis support comprises a first longitudinal beam, a second longitudinal beam, a first cross beam, a second cross beam, a support and a swing arm. The upper surface of the first longitudinal beam and the upper surface of the second longitudinal beam are each provided with two sets of supports, the lower bottoms of the supports are provided with turned-over edges, the turned-over edges are provided with first self-plugging rivet holes, and the upper surfaces of the first longitudinal beam and the second longitudinal beam are each provided with a second self-plugging rivet hole; a rivet penetrates through the first self-plugging rivet hole and the second self-plugging rivet hole to connect the flange with the first longitudinal beam / the second longitudinal beam; in the support, a first bolt hole is formed in the side wall, perpendicular to the turned-over edge, of the support, and one end of the swing arm is in threaded connection with the support through the first bolt hole. The sliding plate chassis support is high in positioning precision, does not depend on manual operation and is not prone to deformation after being welded.

Description

Technical Field

[0001] The invention belongs to the field of product manufacturing, and in particular relates to a skateboard chassis bracket and a processing method thereof. Background Art

[0002] The skateboard chassis is a type of chassis designed specifically for electric vehicles. It has the advantages of low center of gravity, lower aerodynamic resistance and better vehicle stability. It can effectively shorten the vehicle development cycle and is more suitable for platform production. The main body of the electric vehicle skateboard chassis is made of 6 series aluminum alloy extruded profiles, the front and rear bumpers are mostly stamped with 7 series aluminum alloy plates, the wheel covers are mostly die-casting, and some products are spliced ​​with aluminum alloy plates and profiles. The product connection methods include welding and screw connection. Among them, welding is the main connection method, and screw connection is mainly used for the connection of the subframe, battery tray and lower body assembly. There are multiple mounting brackets on the electric vehicle skateboard chassis, including swing arm mounting brackets and tie rod mounting brackets. The mounting brackets are mostly stamped with plates and welded to the main crossbeams and longitudinal beams of the chassis. The positioning method of the mounting bracket on the electric vehicle skateboard chassis adopts edge positioning, that is, the positioning is carried out by measuring the distance to the edge of the connector and the upper and lower distances. The positioning accuracy is low, which depends on the proficiency of the operator, increases the uncertainty factor, and the production efficiency is low. The positioning method of the mounting bracket on the electric vehicle skateboard chassis adopts tooling position, which increases the difficulty of tooling design and production. Summary of the invention

[0003] The invention aims to solve the technical problems that the positioning accuracy of a skateboard chassis bracket is low, the bracket relies on manual operation, and the bracket is easy to deform after welding.

[0004] In order to achieve the above-mentioned object, the present invention provides a skateboard chassis bracket in a first aspect, which comprises a first longitudinal beam (1), a second longitudinal beam (2), a first cross beam (3), a second cross beam (4), a bracket (5), and a swing arm (6);

[0005] The first crossbeam (3) and the second crossbeam (4) are arranged in parallel;

[0006] One end of the first cross beam (3) and the second cross beam (4) are both welded to the first longitudinal beam (1);

[0007] The other ends of the first cross beam (3) and the second cross beam (4) are both welded to the second longitudinal beam (2);

[0008] Two groups of brackets (5) are provided on the upper surfaces of the first longitudinal beam (1) and the second longitudinal beam (2), and the bottom of the bracket is provided with a flange (53), and the flange (53) is provided with a first blind rivet hole (51).

[0009] Second blind rivet holes (11) are provided on the upper surfaces of the first longitudinal beam (1) and the second longitudinal beam (2);

[0010] The rivet passes through the first blind rivet hole (51) and the second blind rivet hole (11) to connect the flange (53) to the first longitudinal beam (1) / the second longitudinal beam (2);

[0011] In the bracket, a first bolt hole (52) is provided on a side wall perpendicular to the flange, and one end of the swing arm (6) is screwed to the bracket (5) through the first bolt hole (52);

[0012] The first crossbeam and the second crossbeam are both square tube structures. When the first crossbeam and the second crossbeam are welded to the longitudinal beam, there are four welds, namely two butt welds located at the upper and lower ends of the crossbeam end, and two vertical welds located at the left and right ends of the crossbeam end. The length direction of the butt weld is horizontal, and the length direction of the vertical weld is vertical;

[0013] The two vertical seams are respectively an inner vertical seam (7) and an outer vertical seam (8);

[0014] The two groups of horizontal beams and the two groups of longitudinal beams are combined to form a closed structure. Among the two groups of vertical seams at the ends of the horizontal beams, the inner vertical seam is closer to the center of the closed structure.

[0015] A second aspect of the present invention provides a method for processing the above-mentioned skateboard chassis bracket, wherein the processing method comprises:

[0016] S1 mechanically processes the first blind rivet hole, the first bolt hole of the bracket, and the second blind rivet hole and the second bolt hole on the first longitudinal beam and the second longitudinal beam;

[0017] S2 connects the bracket to the first longitudinal beam / the second longitudinal beam by passing a blind rivet through a first blind rivet hole on the bracket and a second blind rivet hole on the first longitudinal beam / the second longitudinal beam;

[0018] S3: welding the flange of the bracket to the first longitudinal beam / the second longitudinal beam;

[0019] S4 welds the vertical seam, and then welds the butt weld. The order of welding the vertical seams is to first weld the vertical seam between the first longitudinal beam and the first transverse beam, then weld the vertical seam between the second longitudinal beam and the second transverse beam, then weld the vertical seam between the second longitudinal beam and the first transverse beam, and then weld the vertical seam between the first longitudinal beam and the second transverse beam. The welding order of the butt weld is the same as that of the vertical seam.

[0020] S5 upper part;

[0021] S6 assembly;

[0022] The first crossbeam and the second crossbeam are both square tube structures. When the first crossbeam and the second crossbeam are welded to the longitudinal beam, there are four welds, namely two butt welds located at the upper and lower ends of the crossbeam end, and two vertical welds located at the left and right ends of the crossbeam end. The length direction of the butt weld is horizontal, and the length direction of the vertical weld is vertical;

[0023] The two vertical seams are respectively an inner vertical seam and an outer vertical seam;

[0024] The two groups of horizontal beams and the two groups of longitudinal beams are combined to form a closed structure. Among the two groups of vertical seams at the ends of the horizontal beams, the inner vertical seam is closer to the center of the closed structure.

[0025] A third aspect of the present invention provides a skateboard chassis bracket manufactured by the above processing method.

[0026] Beneficial effects: The skateboard chassis bracket disclosed by the present invention has high positioning accuracy, does not rely on manual operation, and the bracket is not easy to deform after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of the skateboard chassis bracket of the present invention.

[0028] Figure 2 A schematic diagram of the structure of the bracket.

[0029] Figure 3 This is a schematic diagram of the structure of the longitudinal beam.

[0030] Figure 4 This is the assembly welding diagram of the skateboard chassis bracket.

[0031] In the figure: 1. first longitudinal beam, 2. second longitudinal beam, 3. first cross beam, 4. second cross beam, 5. bracket, 6. swing arm, 7. inner vertical seam, 8. outer vertical seam, 11. first blind rivet hole, 12. second bolt hole, 51. first blind rivet hole, 52. first bolt hole, 53. flange, 54. bottom plate, 55. side wall. DETAILED DESCRIPTION

[0032] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0035] like Figures 1 to 4 As shown, the first aspect of the present invention provides a skateboard chassis bracket, which includes a first longitudinal beam 1, a second longitudinal beam 2, a first cross beam 3, a second cross beam 4, a bracket 5, and a swing arm 6;

[0036] The first cross beam 3 and the second cross beam 4 are arranged in parallel;

[0037] One end of the first cross beam 3 and the second cross beam 4 are both welded to the first longitudinal beam 1;

[0038] The other ends of the first cross beam 3 and the second cross beam 4 are welded to the second longitudinal beam 2;

[0039] Two sets of brackets 5 are provided on the upper surfaces of the first longitudinal beam 1 and the second longitudinal beam 2. The lower bottom of the bracket is provided with a flange 53, and the flange 53 is provided with a first blind rivet hole 51.

[0040] The upper surfaces of the first longitudinal beam 1 and the second longitudinal beam 2 are both provided with second blind rivet holes 11;

[0041] The rivets pass through the first blind rivet hole 51 and the second blind rivet hole 11 to connect the flange 53 with the first longitudinal beam 1 / the second longitudinal beam 2;

[0042] In the bracket, a first bolt hole 52 is provided on a side wall perpendicular to the flange, and one end of the swing arm 6 is screwed to the bracket 5 through the first bolt hole 52;

[0043] The first crossbeam and the second crossbeam are both square tube structures. When the first crossbeam and the second crossbeam are welded to the longitudinal beam, there are four welds, namely two butt welds located at the upper and lower ends of the crossbeam end, and two vertical welds located at the left and right ends of the crossbeam end. The length direction of the butt weld is horizontal, and the length direction of the vertical weld is vertical;

[0044] The two vertical seams are respectively an inner vertical seam (7) and an outer vertical seam (8);

[0045] The two groups of horizontal beams and the two groups of longitudinal beams are combined to form a closed structure. Among the two groups of vertical seams at the ends of the horizontal beams, the inner vertical seam is closer to the center of the closed structure.

[0046] The middle parts of the first longitudinal beam 1 and the second longitudinal beam 2 are both concave toward the first cross beam 3 and the second cross beam 4 .

[0047] The middle parts of the first longitudinal beam 1 and the second longitudinal beam 2 are both concave toward the first cross beam 3 and the second cross beam 4. The flange 53 is welded to the first longitudinal beam 1 / the second longitudinal beam 2.

[0048] The bracket includes a flange 53 , a bottom plate 54 , and side walls 55 . The side walls 55 are relatively arranged on both sides of the bottom plate 54 . The flange 53 is arranged at the bottom of the side wall 55 and is perpendicular to the side wall 55 and the bottom plate 54 .

[0049] Second bolt holes 12 are disposed at both ends of the first longitudinal beam 1 and the second longitudinal beam 2 .

[0050] A second aspect of the present invention provides a method for processing the above-mentioned skateboard chassis bracket, wherein the processing method comprises:

[0051] S1 mechanically processes the first blind rivet hole, the first bolt hole of the bracket, and the second blind rivet hole and the second bolt hole on the first longitudinal beam and the second longitudinal beam;

[0052] S2 connects the bracket to the first longitudinal beam / the second longitudinal beam by passing a blind rivet through a first blind rivet hole on the bracket and a second blind rivet hole on the first longitudinal beam / the second longitudinal beam;

[0053] S3: welding the flange of the bracket to the first longitudinal beam / the second longitudinal beam;

[0054] S4 welds the vertical seam, and then welds the butt weld. The order of welding the vertical seams is to first weld the vertical seam between the first longitudinal beam and the first transverse beam, then weld the vertical seam between the second longitudinal beam and the second transverse beam, then weld the vertical seam between the second longitudinal beam and the first transverse beam, and then weld the vertical seam between the first longitudinal beam and the second transverse beam. The welding order of the butt weld is the same as that of the vertical seam.

[0055] S5 upper part;

[0056] S6 assembly;

[0057] The first crossbeam and the second crossbeam are both square tube structures. When the first crossbeam, the second crossbeam and the longitudinal beam are welded, there are four welds, namely two butt welds located at the upper and lower ends of the crossbeam end, and two vertical welds located at the left and right ends of the crossbeam end. The length direction of the butt weld is horizontal, and the length direction of the vertical weld is vertical.

[0058] The two vertical seams are respectively an inner vertical seam and an outer vertical seam.

[0059] The two groups of horizontal beams and the two groups of longitudinal beams are combined to form a closed structure. Among the two groups of vertical seams at the ends of the horizontal beams, the one close to the center of the closed structure is the inner vertical seam.

[0060] In the present invention, the above-mentioned specific welding sequence can solve the problem of deformation of the skateboard chassis bracket after welding.

[0061] As a supplement to the technical solution of the present invention, Figure 1 As shown, taking the first cross beam as an example, among the two groups of vertical seams of the first cross beam, the vertical seams close to the second cross beam are inner vertical seams, and the vertical seams away from the second cross beam are outer vertical seams.

[0062] In the present invention, the vertical weld in S4 is welding the inner and outer vertical welds between the longitudinal beam and the cross beam before welding the next welding point, and the butt weld is welding the upper and lower surface butt welds between the longitudinal beam and the cross beam before welding the next welding point.

[0063] According to the present invention, the welding process of the welding comprises:

[0064] Laser wire-filling welding process, laser power is 4200-4500W, defocus is 0, wire feeding speed is 4.2-4.5m / min, welding speed is 3-4m / min.

[0065] In the present invention, the above-mentioned specific welding process with low heat input can solve the problem of deformation of the skateboard chassis bracket after welding.

[0066] A third aspect of the present invention provides a skateboard chassis bracket manufactured by the above processing method.

[0067] Test Method

[0068] The flatness measurement uses a special fixture to place the profile in a flat position and measure the maximum distance from the profile surface to the fixture surface.

[0069] The position deviation measurement is carried out using three-coordinate measurement to measure the hole coordinate value.

[0070] The position deviation of the bracket hole after welding is the position difference of the center position of the blind rivet hole of the bracket before and after welding.

[0071] The position deviation of the longitudinal beam hole after welding is the position difference of the center position of the longitudinal beam blind rivet hole before and after welding.

[0072] The technical scheme of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Obviously, the embodiments described herein are only some embodiments of the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments implemented by ordinary technicians in this field without making creative improvements belong to the protection scope of the present invention.

[0073] Example 1

[0074] The S1 bracket has a flange, and the first blind rivet hole, the first bolt hole, and the second blind rivet hole and the second bolt hole on the first longitudinal beam and the second longitudinal beam are machined. The blind rivet holes at the flange use two M5 blind rivets, and the hole diameter is 5.1mm.

[0075] S2 connects the bracket to the first longitudinal beam / the second longitudinal beam by passing a blind rivet through a first blind rivet hole on the bracket and a second blind rivet hole on the first longitudinal beam / the second longitudinal beam.

[0076] The flange of the S3 bracket is welded to the first longitudinal beam / the second longitudinal beam.

[0077] After S4 positioning, the workpiece is assembled to a special tooling for welding. All vertical seams are welded first, and then the upper and lower butt welds are welded after the vertical seams are welded. First, the vertical seam between the first longitudinal beam and the first crossbeam is welded, then the vertical seam between the second longitudinal beam and the second crossbeam, then the vertical seam between the second longitudinal beam and the first crossbeam, and then the vertical seam between the first longitudinal beam and the second crossbeam. In this order, the butt welds on the upper surface are welded, and the tooling is turned over to complete the butt welds on the lower surface. The laser wire welding process is adopted, the laser power is 4300W, the defocus is 0, the wire feeding speed is 4.2m / min, and the welding speed is 3.5m / min.

[0078] S5 places the first longitudinal beam and the second longitudinal beam and the first cross beam and the second cross beam, which have been welded to the bracket, on a special tool.

[0079] The S6 tooling is equipped with clamping and support blocks, and the support blocks are equipped with three-way adjustable positioning pins. The swing arm is connected by bolts on the bracket, and the bolt holes of the first longitudinal beam and the second longitudinal beam and the first cross beam and the second cross beam are matched to complete the assembly.

[0080] The skateboard chassis bracket A1 is obtained.

[0081] Example 2

[0082] The S1 bracket has a flange, and the first blind rivet hole, the first bolt hole, and the second blind rivet hole and the second bolt hole on the first longitudinal beam and the second longitudinal beam are machined. The blind rivet holes at the flange use two M5 blind rivets, and the hole diameter is 5.1mm.

[0083] S2 connects the bracket to the first longitudinal beam / the second longitudinal beam by passing a blind rivet through a first blind rivet hole on the bracket and a second blind rivet hole on the first longitudinal beam / the second longitudinal beam.

[0084] The flange of the S3 bracket is welded to the first longitudinal beam / the second longitudinal beam.

[0085] After S4 positioning, the workpiece is assembled to a special tooling for welding. All vertical seams are welded first, and then the upper and lower butt welds are welded after the vertical seams are welded. First, the vertical seam between the first longitudinal beam and the first crossbeam is welded, then the vertical seam between the second longitudinal beam and the second crossbeam, then the vertical seam between the second longitudinal beam and the first crossbeam, and then the vertical seam between the first longitudinal beam and the second crossbeam. In this order, the butt welds on the upper surface are welded, and the tooling is turned over to complete the butt welds on the lower surface. The laser wire welding process is adopted, the laser power is 4200W, the defocus is 0, the wire feeding speed is 4.2m / min, and the welding speed is 3.5m / min.

[0086] S5 places the first longitudinal beam and the second longitudinal beam and the first cross beam and the second cross beam, which have been welded to the bracket, on a special tool.

[0087] The S6 tooling is equipped with clamping and support blocks, and the support blocks are equipped with three-way adjustable positioning pins. The swing arm is connected by bolts on the bracket, and the bolt holes of the first longitudinal beam and the second longitudinal beam and the first cross beam and the second cross beam are matched to complete the assembly.

[0088] The skateboard chassis bracket A2 is obtained.

[0089] Example 3

[0090] The S1 bracket has a flange, and the first blind rivet hole, the first bolt hole, and the second blind rivet hole and the second bolt hole on the first longitudinal beam and the second longitudinal beam are machined. The blind rivet holes at the flange use two M5 blind rivets, and the hole diameter is 5.1mm.

[0091] S2 connects the bracket to the first longitudinal beam / the second longitudinal beam by passing a blind rivet through a first blind rivet hole on the bracket and a second blind rivet hole on the first longitudinal beam / the second longitudinal beam.

[0092] The flange of the S3 bracket is welded to the first longitudinal beam / the second longitudinal beam.

[0093] After S4 positioning, the workpiece is assembled to a special tooling for welding. All vertical seams are welded first, and then the upper and lower butt welds are welded after the vertical seams are welded. First, the vertical seam between the first longitudinal beam and the first crossbeam is welded, then the vertical seam between the second longitudinal beam and the second crossbeam, then the vertical seam between the second longitudinal beam and the first crossbeam, and then the vertical seam between the first longitudinal beam and the second crossbeam. In this order, the butt welds on the upper surface are welded, and the tooling is turned over to complete the butt welds on the lower surface. The laser wire welding process is adopted, the laser power is 4500W, the defocus is 0, the wire feeding speed is 4.5m / min, and the welding speed is 3m / min.

[0094] S5 places the first longitudinal beam and the second longitudinal beam and the first cross beam and the second cross beam, which have been welded to the bracket, on a special tool.

[0095] The S6 tooling is equipped with clamping and support blocks, and the support blocks are equipped with three-way adjustable positioning pins. The swing arm is connected by bolts on the bracket, and the bolt holes of the first longitudinal beam and the second longitudinal beam and the first cross beam and the second cross beam are matched to complete the assembly.

[0096] The skateboard chassis bracket A3 is obtained.

[0097] Comparative Example 1

[0098] The S1 bracket has no flange structure.

[0099] S2 uses a ruler to measure the distance between the bracket and the edge, and then performs welding to fix the points and determine the position.

[0100] After S3 positioning, the workpiece is assembled into a special tooling for welding.

[0101] After S4 welding is completed, the swing arm is connected by bolts on the bracket.

[0102] A skateboard chassis bracket DA1 was obtained.

[0103] Comparative Example 2

[0104] The S1 bracket has no flange structure.

[0105] S2 uses tooling positioning blocks to position the bracket.

[0106] After S3 positioning, the workpiece is assembled into a special tooling for welding.

[0107] After S4 welding is completed, the swing arm is connected by bolts on the bracket.

[0108] The skateboard chassis bracket DA2 was obtained.

[0109] Comparative Example 3

[0110] The skateboard chassis bracket was prepared according to the processing method of Example 1, except that the welding sequence was to first weld the vertical seam between the first longitudinal beam and the first transverse beam, then weld the vertical seam between the first longitudinal beam and the second transverse beam, then weld the vertical seam between the second longitudinal beam and the second transverse beam, and then weld the vertical seam between the first longitudinal beam and the first transverse beam. The butt weld of the upper surface was completed in this sequence, and the butt weld of the lower surface was completed after the tooling was turned over. The skateboard chassis bracket DA3 was obtained.

[0111] Comparative Example 4

[0112] The skateboard chassis bracket was prepared according to the processing method of Example 1, except that the laser power was 4000 W, the defocus amount was 0, the wire feeding speed was 5 m / min, and the welding speed was 5 m / min. A skateboard chassis bracket DA4 was obtained.

[0113] Table 1 shows the performance parameters of the skateboard chassis brackets A1-A3, DA1-DA4.

[0114] Table 1

[0115]

[0116] It can be seen from Table 1 that the skateboard chassis bracket provided by the present invention has better flatness, and the position deviation of the mounting hole and the position deviation of the longitudinal beam hole after welding are smaller, indicating that the skateboard chassis bracket provided by the present invention has high positioning accuracy, does not rely on manual operation, and the bracket is not easy to deform after welding.

[0117] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A skateboard chassis bracket, characterized in that: It comprises a first longitudinal beam (1), a second longitudinal beam (2), a first cross beam (3), a second cross beam (4), a bracket (5), and a swing arm (6); The first crossbeam (3) and the second crossbeam (4) are arranged in parallel; One end of the first cross beam (3) and the second cross beam (4) are both welded to the first longitudinal beam (1); The other ends of the first cross beam (3) and the second cross beam (4) are both welded to the second longitudinal beam (2); Two groups of brackets (5) are provided on the upper surfaces of the first longitudinal beam (1) and the second longitudinal beam (2), and the bottom of the bracket is provided with a flange (53), and the flange (53) is provided with a first blind rivet hole (51). Second blind rivet holes (11) are provided on the upper surfaces of the first longitudinal beam (1) and the second longitudinal beam (2); The rivet passes through the first blind rivet hole (51) and the second blind rivet hole (11) to connect the flange (53) to the first longitudinal beam (1) / the second longitudinal beam (2); In the bracket, a first bolt hole (52) is provided on a side wall perpendicular to the flange (53), and one end of the swing arm (6) is screwed to the bracket (5) through the first bolt hole (52); The first crossbeam and the second crossbeam are both square tube structures. When the first crossbeam and the second crossbeam are welded to the longitudinal beam, there are four welds, namely two butt welds located at the upper and lower ends of the crossbeam end, and two vertical welds located at the left and right ends of the crossbeam end. The length direction of the butt weld is horizontal, and the length direction of the vertical weld is vertical; The two vertical seams are respectively an inner vertical seam (7) and an outer vertical seam (8); The two groups of horizontal beams and the two groups of longitudinal beams are combined to form a closed structure. Among the two groups of vertical seams at the ends of the horizontal beams, the inner vertical seam is closer to the center of the closed structure.

2. The skateboard chassis bracket according to claim 1, characterized in that: The middle parts of the first longitudinal beam (1) and the second longitudinal beam (2) are both concave toward one side of the first cross beam (3) and the second cross beam (4).

3. The skateboard chassis bracket according to claim 1, characterized in that: The middle parts of the first longitudinal beam (1) and the second longitudinal beam (2) are both concave toward one side of the first cross beam (3) and the second cross beam (4). The flange (53) is welded to the first longitudinal beam (1) / the second longitudinal beam (2).

4. The skateboard chassis bracket according to claim 1, characterized in that: The bracket comprises a flange (53), a bottom plate (54), and a side wall (55); the side wall (55) is arranged on two sides of the bottom plate (54) opposite to each other; the flange (53) is arranged at the bottom of the side wall (55) and is perpendicular to the side wall (55) and the bottom plate (54).

5. The skateboard chassis bracket according to claim 1, characterized in that: Second bolt holes (12) are provided at both ends of the first longitudinal beam (1) and the second longitudinal beam (2).

6. A method for processing a skateboard chassis bracket according to any one of claims 1 to 5, characterized in that: The processing method comprises: S1 mechanically processes the first blind rivet hole, the first bolt hole of the bracket, and the second blind rivet hole and the second bolt hole on the first longitudinal beam and the second longitudinal beam; S2 connects the bracket to the first longitudinal beam / the second longitudinal beam by passing a blind rivet through a first blind rivet hole on the bracket and a second blind rivet hole on the first longitudinal beam / the second longitudinal beam; S3: welding the flange of the bracket to the first longitudinal beam / the second longitudinal beam; S4 welds the vertical seam, and then welds the butt weld. The order of welding the vertical seams is to first weld the vertical seam between the first longitudinal beam and the first transverse beam, then weld the vertical seam between the second longitudinal beam and the second transverse beam, then weld the vertical seam between the second longitudinal beam and the first transverse beam, and then weld the vertical seam between the first longitudinal beam and the second transverse beam. The welding order of the butt weld is the same as that of the vertical seam. S5 upper part; S6 assembly; The first crossbeam and the second crossbeam are both square tube structures. When the first crossbeam and the second crossbeam are welded to the longitudinal beam, there are four welds, namely two butt welds located at the upper and lower ends of the crossbeam end, and two vertical welds located at the left and right ends of the crossbeam end. The length direction of the butt weld is horizontal, and the length direction of the vertical weld is vertical; The two vertical seams are respectively an inner vertical seam and an outer vertical seam; The two groups of horizontal beams and the two groups of longitudinal beams are combined to form a closed structure. Among the two groups of vertical seams at the ends of the horizontal beams, the inner vertical seam is closer to the center of the closed structure.

7. The processing method according to claim 6, characterized in that: The welding process of the welding comprises: Laser wire-filling welding process, laser power is 4200-4500W, defocus is 0, wire feeding speed is 4.2-4.5m / min, welding speed is 3-4m / min.

8. A skateboard chassis bracket manufactured by the processing method according to claim 6 or 7.

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