Stamping and welding auxiliary frame structure

Abstract

The invention relates to the related technical field of auxiliary frames, and discloses a stamping and welding auxiliary frame structure which comprises an auxiliary frame body. The auxiliary frame main body is formed by correspondingly welding a front cross beam, a rear cross beam, a left longitudinal beam, a right longitudinal beam, a left middle tower and a right middle tower, each of the left longitudinal beam and the right longitudinal beam is formed by welding a longitudinal beam upper plate and a longitudinal beam lower plate, and the longitudinal beam upper plate is divided into a front-end low-stress area and a rear-section high-stress area; the front-end low-stress area is made of a plate with the mark of QStE550TM and the thickness of 1.8 mm, and the rear-section high-stress area is made of a plate with the mark of QStE550TM and the thickness of 2.0 mm. According to the stamping and welding auxiliary frame structure, a plate with the thickness of 2.0 mm is used in a high-stress area to guarantee strength, a plate with the thickness of 1.8 mm is used in a low-stress area, the design of hexagonal lightening holes is matched, the weight reduction effect is obvious, and the requirements for strength and light weight are met; and the process of high-frequency tailor-welding and then stamping is adopted, so that the splicing firmness of the plates is guaranteed, and the stamping forming precision and the overall quality of products are improved.

Description

Technical Field

[0001] This invention relates to the technical field of subframes, specifically a stamped and welded subframe structure. Background Technology

[0002] The front subframe is the core load-bearing component of a car chassis. Its main function is to install and fix the suspension and steering system, and to transmit and disperse the impact forces during vehicle driving, which directly affects the overall vehicle driving stability and safety. As disclosed in announcement number CN221660839U, a novel stamped and welded front subframe includes a subframe body composed of a left longitudinal beam, a right longitudinal beam, a front crossbeam, and a rear crossbeam. Front anti-collision beam brackets are welded to the left and right ends of the surface of the front crossbeam. The left and right longitudinal beams are installed on the left and right sides of the subframe body. Stress grooves are formed on the surface of the rear crossbeam. A swing arm front point bracket is installed on the front side of the center tower sleeve. Front anti-collision beam brackets are welded to the front ends of both the left and right longitudinal beams. The left and right longitudinal beams are stamped parts, and the front crossbeam is a combination of stamped tubular beams and welded beams, improving the dimensional accuracy of the overall subframe profile. The front crossbeam uses a combination of tubular and welded components, resulting in a compact arrangement and reducing space requirements. The design of local overlapping surfaces and structures improves the matching and overlapping accuracy between parts, enhancing the overall durability and rigidity of the subframe. However, existing technologies often use steel plates of a single thickness that are stamped and then welded together, making it difficult to balance the strength requirements of high-stress areas with the weight reduction requirements of non-stress areas; maintaining the original thickness would hinder weight reduction, waste materials, and increase production costs, making it difficult to meet the requirements for lightweight chassis upgrades. Therefore, the present invention provides a stamped and welded subframe structure to solve the problems mentioned above. Summary of the Invention

[0003] The purpose of this invention is to provide a stamped and welded subframe structure to solve the problems mentioned in the background art, which are that the use of steel plates of a single thickness for stamping and welding assembly makes it difficult to meet the strength requirements of high-stress areas and the weight reduction requirements of non-stress areas; maintaining the original thickness will hinder weight reduction, and will also cause material waste and increase production costs, making it difficult to meet the requirements for lightweight chassis upgrades.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a stamped and welded subframe structure, comprising a subframe body; Also includes: The main body of the subframe includes a front crossbeam, a rear crossbeam, a left longitudinal beam, a right longitudinal beam, a left center tower, and a right center tower, which are welded together. The left and right longitudinal beams are both welded together by upper and lower plates. The upper plate of the longitudinal beam is divided into a low-stress area at the front end and a high-stress area at the rear end. The front low-stress area uses QStE550TM material with a thickness of 1.8mm, and the rear high-stress area uses QStE550TM material with a thickness of 2.0mm. The two sections of material are spliced ​​together by high-frequency welding and then stamped.

[0005] Preferably, a left front control arm is welded between the left longitudinal beam and the left center tower, and a right front control arm is welded between the right longitudinal beam and the right center tower; a left stabilizer bar, a left steering gear, and a left rear control arm are sequentially welded to the side of the left longitudinal beam away from the front crossbeam, and a right stabilizer bar, a right steering gear, and a right rear control arm are sequentially welded to the side of the right longitudinal beam away from the front crossbeam.

[0006] Preferably, the upper plate of the longitudinal beam and the lower plate of the longitudinal beam are provided with a stop at the welding mating point, which is used for clamping and positioning by a clamping mechanism after fastening.

[0007] Preferably, the upper plate and the lower plate of the longitudinal beam are respectively provided with trapezoidal notches, which, when matched, form a hexagonal weight-reducing hole, and the weld is welded at the two opposite corners of the hexagon.

[0008] Preferably, the lower plate of the longitudinal beam is provided with a wire harness bracket, and the lower plate of the longitudinal beam is also provided with a platform feature that overlaps and cooperates with the wire harness bracket.

[0009] Preferably, the wire harness bracket has a self-symmetrical structure, which can be used on both the left and right sides.

[0010] Compared with the prior art, the beneficial effects of this invention are as follows: In this stamped and welded subframe structure, the longitudinal beams use QStE550TM plates of different thicknesses according to stress zones. High-stress areas use 2.0mm thick plates to ensure strength, while low-stress areas use 1.8mm thick plates. Combined with the hexagonal weight-reduction hole design, the weight reduction effect is significant, balancing strength and lightweight requirements. A stop structure is provided at the weld joint between the upper and lower plates of the longitudinal beams. After fastening, the clamping mechanism positions the beams, eliminating the need for additional adjustments to meet the longitudinal beam height design requirements and improving assembly efficiency. The inclined sides of the hexagonal weight-reduction holes can disperse stress, preventing stress concentration at the weld ends and extending the subframe's service life. The "high-frequency welding followed by stamping" process ensures the strong splicing of the plates, improving stamping accuracy and overall product quality. 1. Lightweighting and cost reduction: 2.0mm thick plates are used in high-stress areas and 1.8mm thick plates are used in low-stress areas, reducing product weight by 8.4% and reducing material waste and production costs; 2. Balancing strength and stiffness: Segmented matching plate thickness + hexagonal weight-reducing holes disperse stress, meeting load-bearing strength requirements and avoiding safety hazards; 3. Cost reduction and efficiency improvement: The wire harness bracket is self-symmetrical and can be used on both sides, reducing mold development; the stop design ensures welding accuracy and simplifies the process. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the structure of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention from a bottom view; Figure 4 This is a schematic diagram of the overall structure of the low-stress area at the front end and the high-stress area at the rear end of the present invention. Figure 5 This is a schematic diagram of the overall structure of the upper plate of the longitudinal beam, the lower plate of the longitudinal beam, and the stop of the present invention; Figure 6 This is a schematic diagram of the overall structure of the upper plate of the longitudinal beam, the lower plate of the longitudinal beam, and the weight reduction hole of the present invention; Figure 7 This is a schematic diagram of the connection between the lower plate of the longitudinal beam and the wire harness bracket of the present invention.

[0012] In the diagram: 1. Front crossbeam; 2. Rear crossbeam; 3. Left longitudinal beam; 4. Right longitudinal beam; 5. Left center tower; 6. Right center tower; 7. Left front control arm; 8. Right front control arm; 9. Left stabilizer bar; 10. Right stabilizer bar; 11. Left steering gear; 12. Right steering gear; 13. Left rear control arm; 14. Right rear control arm; 15. Upper plate of longitudinal beam; 16. Lower plate of longitudinal beam; 17. Wiring harness bracket; 18. Low-stress area at the front end; 19. High-stress area at the rear end. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] Please see Figures 1-7 The present invention provides the following technical solution: To address the shortcomings of existing technologies that often use steel plates of a single thickness, stamped and welded together, making it difficult to balance the strength requirements of high-stress areas with the weight reduction needs of non-stress areas; and to prevent weight reduction from being hindered by maintaining the original thickness, which would also lead to material waste, increased production costs, and failure to meet the requirements for lightweight chassis upgrades, this solution proposes a stamped and welded subframe structure, comprising a subframe body, a left front control arm 7, a right front control arm 8, a left stabilizer bar 9, a right stabilizer bar 10, a left steering gear 11, a right steering gear 12, a left rear control arm 13, a right rear control arm 14, an upper longitudinal beam plate 15, a lower longitudinal beam plate 16, and a wiring harness bracket 1. 7. Front low-stress area 18, rear high-stress area 19; The main body of the subframe consists of front crossbeam 1, rear crossbeam 2, left longitudinal beam 3, right longitudinal beam 4, left center tower 5 and right center tower 6 welded together. The left longitudinal beam 3 and right longitudinal beam 4 are both welded together by the upper plate 15 and the lower plate 16 of the longitudinal beam. The upper plate 15 of the longitudinal beam is divided into a front low-stress area 18 and a rear high-stress area 19. The front low-stress area 18 uses QStE550TM material with a thickness of 1.8mm, and the rear high-stress area 19 uses QStE550TM material with a thickness of 2.0mm. The two sections of material are spliced ​​together by high-frequency welding and then stamped. like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, based on the stress distribution of the subframe, the upper longitudinal beam plate 15 is first divided into a low-stress area 18 at the front end and a high-stress area 19 at the rear end. 1.8mm thick and 2.0mm thick QStE550TM plates are selected respectively and spliced ​​into an integral plate by high-frequency welding. After stamping, individual pieces such as the upper longitudinal beam plate 15 and the lower longitudinal beam plate 16 are obtained. During assembly, the upper longitudinal beam plate 15 and the lower longitudinal beam plate 16 are fastened by a stop and fixed in position by a clamping mechanism. The trapezoidal notches of the two are combined to form a hexagonal weight-reducing hole, and the weld is welded to the two opposite corners of the hexagon to disperse stress. Subsequently, the front crossbeam 1, rear crossbeam 2, left longitudinal beam 3, right longitudinal beam 4, left center tower 5, and right center tower 6 are welded into white parts. After electrophoretic coating and cleaning, the wire harness bracket 17 is attached to the platform feature of the lower plate 16 of the longitudinal beam to finally produce the finished front subframe, which achieves weight reduction and cost reduction while meeting the load-bearing and protection requirements.

[0015] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0016] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A stamped and welded subframe structure, comprising a subframe body; Its features are, Also includes: The main body of the subframe consists of a front crossbeam (1), a rear crossbeam (2), a left longitudinal beam (3), a right longitudinal beam (4), a left center tower (5), and a right center tower (6) welded together. The left longitudinal beam (3) and the right longitudinal beam (4) are both welded together by an upper plate (15) and a lower plate (16) of the longitudinal beam. The upper plate (15) of the longitudinal beam is divided into a low-stress area (18) at the front end and a high-stress area (19) at the rear end. The front low-stress area (18) is made of QStE550TM material with a thickness of 1.8mm, and the rear high-stress area (19) is made of QStE550TM material with a thickness of 2.0mm. The two sections of material are spliced ​​together by high-frequency welding and then stamped.

2. The stamped and welded subframe structure according to claim 1, characterized in that: A left front swing arm (7) is welded between the left longitudinal beam (3) and the left center tower (5), and a right front swing arm (8) is welded between the right longitudinal beam (4) and the right center tower (6); a left stabilizer bar (9), a left steering gear (11) and a left rear swing arm (13) are welded sequentially on the side of the left longitudinal beam (3) away from the front cross beam (1), and a right stabilizer bar (10), a right steering gear (12) and a right rear swing arm (14) are welded sequentially on the side of the right longitudinal beam (4) away from the front cross beam (1).

3. The stamped and welded subframe structure according to claim 1, characterized in that: The upper plate (15) and the lower plate (16) of the longitudinal beam are provided with a stop at the welding matching point, which is used to clamp and position the beam after it is fastened together by a clamping mechanism.

4. The stamped and welded subframe structure according to claim 3, characterized in that: The upper plate (15) and lower plate (16) of the longitudinal beam are respectively provided with trapezoidal notches, which are matched to form a hexagonal weight reduction hole, and the weld is welded to the two opposite corners of the hexagon.

5. The stamped and welded subframe structure according to claim 4, characterized in that: The lower plate (16) of the longitudinal beam is provided with a wire harness bracket (17), and the lower plate (16) of the longitudinal beam is also provided with a platform feature that overlaps and cooperates with the wire harness bracket (17).

6. The stamped and welded subframe structure according to claim 5, characterized in that: The wire harness bracket (17) is a self-symmetrical structure that can be used on both the left and right sides.

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