Low-density polymer foam reinforced high-strength steel thin-wall automobile anti-collision beam

Abstract

A low-density polymer foam reinforced high-strength steel thin-wall automobile anti-collision beam relates to the technical field of automobile anti-collision beams and comprises a thin-wall beam, a foam block and polymer foam, the wall thickness of the thin-wall beam is 1 cm, an inner cavity of the thin-wall beam is filled with the polymer foam, and the flexural rigidity, the structural stability and the collision energy absorption level of the thin-wall beam can be greatly improved after filling. And the foam blocks are arranged at the front ends of the thin-wall beams, protection of the legs of pedestrians is facilitated, and the polymer foam blocks are only subjected to compression elastic deformation after collision and can restore to the original shape after unloading. According to the utility model, the self weight is reduced while the overall strength is ensured, and the energy absorption performance is good.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile anti-collision beams, in particular to a low-density polymer foam reinforced high-strength steel thin-wall automobile anti-collision beam. Background Art

[0002] Automobile safety is gaining increasing attention from the industry and consumers. In the area of ​​passive safety, the anti-collision beam is a crucial structural safety component, significantly impacting the vehicle's structural crashworthiness and pedestrian protection. First, the anti-collision beam, along with the two longitudinal body rails and the firewall, forms a closed frame structure, ensuring the vehicle's structural integrity in high-speed collisions and providing energy buffering. Second, during low-speed pedestrian protection tests, a pedestrian's legs will collide with the anti-collision beam, causing some damage. Clearly, the anti-collision beam must possess sufficient rigidity; otherwise, it will be difficult to maintain structural integrity and ensure effective energy absorption in high-speed collisions. However, if the anti-collision beam is too rigid, the contact force between the two will increase when colliding with the pedestrian's legs, causing serious damage to the pedestrian's legs.

[0003] In summary, there are certain contradictions in the design of anti-collision beam stiffness for high-speed head-on collisions and low-speed collisions, requiring a balance. Furthermore, compared with other lightweight materials (such as aluminum alloys and magnesium alloys), steel anti-collision beams have the disadvantage of being heavier, which hinders vehicle lightweighting. Reducing the thickness of the steel plate is an effective way to reduce weight. However, thinner steel plates reduce the bending stiffness of the anti-collision beam, making it more likely to cause structural instability under load, which is detrimental to structural collision safety.

[0004] In the Chinese utility model patent application number "201911070997.7" entitled "A Novel Sandwich Structure Automobile Front Anti-collision Beam and Assembly," a anti-collision beam with a tubular aluminum alloy shell structure is disclosed. The technical solution in the article solves the problem of lightweighting the vehicle while ensuring the overall strength and energy absorption performance of the anti-collision beam. However, there are problems with the high manufacturing cost of the tubular aluminum alloy shell, and in low-speed collisions, the tubular aluminum alloy shell directly contacts pedestrians or foreign objects, resulting in insufficient energy absorption performance and greater damage. Therefore, the utility model adopts low-density polymer foam filling to reinforce high-strength thin-walled steel technology to resolve the above contradictions and problems. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide an automobile anti-collision beam which ensures overall strength while reducing deadweight and has good energy absorption.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A low-density polymer foam reinforced high-strength steel thin-wall automotive bumper beam, comprising a thin-wall beam, a foam block, and a polymer foam. The wall thickness of the thin-wall beam is 1 mm, and it has a closed inner cavity filled with polymer foam. The foam block is fixed to the side of the thin-wall beam by an adhesive or fasteners.

[0008] For the above-mentioned low-density polymer foam reinforced high-strength steel thin-wall automotive bumper beam, the foam block and the polymer foam are made of a foaming low-density polymer material.

[0009] For the above-mentioned low-density polymer foam reinforced high-strength steel thin-wall automotive bumper beam, according to the requirements of different vehicle models, the cross-sectional shape of the thin-wall beam is set as a "B" shape, a "日" shape or a "目" shape.

[0010] For the above-mentioned low-density polymer foam reinforced high-strength steel thin-wall automotive bumper beam, the cross-sectional shape of the foam block is set as a rectangle, a semicircle or a concave shape.

[0011] The utility model has the following advantages:

[0012] 1. By using low-density polymer foam to fill the high-strength steel thin-wall beam, the compression resistance characteristics of the foam material and the tensile characteristics of the high-strength steel thin plate can be fully utilized. The two materials enhance each other, and after filling, the bending stiffness, structural stability and collision energy absorption level of the thin-wall beam can be greatly improved, thereby improving the crashworthiness of the vehicle body structure. 2. Install a polymer foam block on the outer side of the front end face (collision surface) of the foam reinforced high-strength steel thin-wall bumper beam. The low-density polymer foam block is a good buffer and energy absorption material, which is beneficial to the protection of pedestrians' legs. 3. It is beneficial to vehicle body lightweight. In the utility model, high-strength steel and low-density polymer foam are used as materials, the thickness of the steel plate is very thin, and the density of the polymer foam is small, so the bumper beam will be lighter. 4. Under the condition of low-speed frontal collision, if the collision load is not very high, only compressive elastic deformation will occur to the polymer foam concave block after the collision, and it will return to its original state after unloading. The foam enhances the bending stiffness of the high-strength steel thin-wall bumper beam, and the structure is not prone to permanent deformation, improving the maintenance economy of the bumper beam. Description of the Drawings

[0013] Figure 1 is a three-dimensional structural schematic diagram of the utility model;

[0014] Figure 2 is a schematic diagram of the cross-sectional shape of the "B" shaped thin-wall beam;

[0015] Figure 3 is a schematic diagram of the cross-sectional shape of the rectangular foam block combined with the "日" shaped thin-wall beam;

[0016] Figure 4 is a schematic diagram of the cross-sectional shape of the concave foam block combined with the "目" shaped thin-wall beam;

[0017] Figure 5 It is a schematic cross-sectional view of the combination of a semi-circular foam block and a "day"-shaped thin-walled beam;

[0018] Each label in the figure represents: 1. Thin-walled beam, 1-1. Welding point, 2. Foam block, 3. Polymer foam. Specific implementation mode

[0019] A low-density polymer foam reinforced high-strength steel thin-walled automobile anti-collision beam of the present utility model, such as Figure 1 shown, includes a thin-walled beam 1, a foam block 2, and a polymer foam 3. The thin-walled beam 1 has a closed inner cavity, and the polymer foam 3 is filled in the inner cavity. The polymer foam 3 is bonded or fixed with fasteners on one side of the thin-walled beam 1 facing the front of the automobile.

[0020] A low-density polymer foam reinforced high-strength steel thin-walled automobile anti-collision beam of the present utility model, the wall thickness of the thin-walled beam 1 is set to 1 mm, and high-strength steel plates with a yield strength greater than 1000 Mpa are selected as the material. The thin-walled beam 1 is manufactured by a rolling process and can be rolled into a profile with an inner cavity having a cross-sectional shape of "B"-shaped, "day"-shaped or "eye"-shaped, and then welded at the welding points 1-1.

[0021] A low-density polymer foam reinforced high-strength steel thin-walled automobile anti-collision beam of the present utility model, the foam block 2 and the polymer foam 3 are made of polymer materials that can be foamed, mainly including: polypropylene foam (EPP), polyethylene foam (PE), polyvinyl chloride foam (PVC), polyethylene terephthalate foam (PET), polymethacrylimide foam (PMI), polyimide (PI) foam, polyurethane foam (PU), polystyrene (PS), phenolic foam (PF), epoxy resin foam, nitrile rubber foam, etc. Through the foaming process, the foam is filled in the inner cavity of the thin-walled beam 1.

[0022] A low-density polymer foam reinforced high-strength steel thin-walled automobile anti-collision beam of the present utility model, the thin-walled beam 1 with a cross-sectional shape of "B"-shaped, "day"-shaped or "eye"-shaped and the foam block 2 with a cross-sectional shape of rectangular, semi-circular or concave can be combined and set according to different design requirements of the automobile.

Claims

1. A low-density polymer foam reinforced high-strength steel thin-walled automobile anti-collision beam, characterized by: It includes a thin-walled beam (1), a foam block (2), and a polymer foam (3). The thin-walled beam (1) has a wall thickness of 1 mm and is provided with a closed inner cavity, in which the polymer foam (3) is filled. The foam block (2) is fixed to the side of the thin-walled beam (1) by an adhesive or a fastener.

2. The low-density polymer foam reinforced high-strength steel thin-walled automobile anti-collision beam according to claim 1, characterized in that: The foam block (2) and the polymer foam (3) are made of a foamable low-density polymer material.

3. The low-density polymer foam reinforced high-strength steel thin-walled automobile anti-collision beam according to claim 1, characterized in that: According to the requirements of different vehicle models, the cross-sectional shape of the thin-walled beam (1) is set as a "B" shape, a "day" shape or an "eye" shape.

4. The low-density polymer foam reinforced high-strength steel thin-walled automobile anti-collision beam according to claim 1, characterized in that: The cross-sectional shape of the foam block (2) is set as a rectangle, a semicircle or a concave shape.

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