High-energy-absorption light-weight rolling profile

Abstract

The utility model provides a high-energy-absorption light-weight rolling profile which is of a closed structure shaped like a Chinese character'ri 'and formed by multiple times of cold bending of a steel plate and comprises a first cavity and a second cavity which are arranged side by side, and the first cavity and the second cavity are separated through a double-layer reinforcing rib. The first cavity and the second cavity are formed by bending relative inner circles; the first cavity is firstly closed and is subjected to first-time welding forming; and then closing of the second cavity is completed, second-time welding forming is carried out, and finally the two cavities are connected into a whole. The section bar is provided with the two cavities and the double-layer reinforcing ribs, so that the section bar has sufficient rigidity; compared with traditional rolling profiles shaped like a Chinese character'ri ', a Chinese character'mu' and a Chinese character'B 'with the same size and weight, the rolling profile has a high energy absorption effect, meanwhile has the same strength and bending resistance, and meets the requirements of light weight and national collision regulations.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile profiles, and particularly relates to a high energy-absorbing and lightweight rolled profile. Background Art

[0002] With the popularization of the automobile industry, people pay more and more attention to the safety performance of automobiles. The safety performance of the automobile safety protection system is particularly important, especially for various safety structural parts that have an important impact on the safety performance of automobiles, such as automobile anti-collision beams, battery side beams, etc. The main functions of these safety structural parts are to enhance the strength of the automobile, absorb impact force, and reduce the casualties of drivers and passengers during the automobile collision. Therefore, in order to improve the safety performance of the vehicle body, on the premise of ensuring product quality, it is necessary to continuously improve and develop a safety structural part with high energy absorption, high strength, and lightweight.

[0003] At present, when traditional rolled profiles cannot meet the requirements of high energy absorption and high bending resistance, the strength of the profiles is often improved by increasing the material thickness and other methods to improve the anti-collision performance of the safety structural parts. However, this way of simply increasing the thickness cannot meet the design requirement of automobile lightweight. Therefore, profiles with complex cross-sections have emerged, and the safety collision performance of the profiles is improved through the mutual connection of the profiles. For example, double-support leg profiles, increasing the number of cavities of the profiles, although improving the anti-collision performance of the safety structural parts; but the cross-section is complex, there are many forming blind areas, and the forming accuracy is difficult to control; secondly, the complex cross-section increases the material length, which also does not meet the design requirement of automobile lightweight. Therefore, how to develop a more reasonable profile structure while ensuring the high strength and lightweight of the profile, and further improve the safety performance, has become an important topic being studied by the industry insiders. Summary of the Utility Model

[0004] In order to solve the above problems existing in the prior art, the purpose of the utility model is to provide a high energy-absorbing and lightweight rolled profile.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] A high energy-absorbing and lightweight rolled profile, the rolled profile is a "day"-shaped closed structure formed by cold bending a steel plate multiple times, including a first cavity and a second cavity arranged in parallel, and the first cavity and the second cavity are separated by a double-layer reinforcing rib.

[0007] A further improvement of the utility model is that the first cavity and the second cavity are symmetrically arranged left and right along the double-layer reinforcing rib.

[0008] A further improvement of the present utility model lies in that: the roll-formed profile includes a first upper wall, a second upper wall, a left side wall, a right side wall, a lower wall, a first middle rib, and a second middle rib; the first upper wall, the left side wall, a part of the lower wall, and the first middle rib enclose a first cavity, and the second upper wall, the right side wall, a part of the lower wall, and the second middle rib enclose a second cavity; the first middle rib and the second middle rib are welded together to form a double-layer reinforcing rib, and the end of the double-layer reinforcing rib is welded to the lower wall.

[0009] A further improvement of the present utility model lies in that: the connection mode between the end of the double-layer reinforcing rib and the lower wall is edge-hooking welding connection, bending welding connection or straight welding connection.

[0010] A further improvement of the present utility model lies in that: when the double-layer reinforcing rib adopts the edge-hooking welding connection mode, the end of the first middle rib extends out a first edge-hooking pointing to the inside of the first cavity, and the end of the second middle rib extends out a second edge-hooking pointing to the inside of the second cavity, and the first edge-hooking, the second edge-hooking and the double-layer reinforcing rib form a Y-shaped reinforcing rib structure.

[0011] A further improvement of the present utility model lies in that: an inverted V-shaped rib matching with the Y-shaped reinforcing rib structure is arranged on the lower wall.

[0012] A further improvement of the present utility model lies in that: when the double-layer reinforcing rib adopts the bending welding connection mode, the end of the first middle rib extends out a first folded edge, and the end of the second middle rib extends out a second folded edge; both the first folded edge and the second folded edge are parallel to the lower wall.

[0013] A further improvement of the present utility model lies in that: U-shaped grooves for reinforcement are arranged on the upper wall and / or the lower wall of the first cavity and the second cavity.

[0014] Due to the adoption of the above technical solutions, the technical progress achieved by the present utility model is:

[0015] The present utility model discloses a high-energy-absorbing and lightweight roll-formed profile, which has two juxtaposed closed cavities, making the profile have sufficient rigidity; the two cavities are connected into one body by laser welding, and two layers of reinforcing and supporting ribs are formed in the middle. The reinforcing and supporting ribs effectively improve the strength and bending resistance of the roll-formed profile. Especially when resisting the impact force from a frontal collision, the bending resistance of the profile when being impacted can be significantly improved, and the collision bending deformation of the profile can be effectively resisted.

[0016] It has been proved by experiments that compared with the traditional roll-formed profiles in the shape of a Japanese character, a Chinese character "mu", and a letter "B" with the same size and weight, the roll-formed profile of the present utility model not only ensures the strength and rigidity of the profile itself, but also significantly improves the energy absorption peak value of the roll-formed profile, meets the national collision regulation requirements of high energy absorption and lightweight, and is especially suitable for being used as a safety structural member of a vehicle safety protection system, such as an automobile anti-collision beam, a battery side beam or other side beam type profiles, etc. Brief Description of the Drawings

[0017] Figure 1 It is a sectional view of Embodiment 1 of the present utility model;

[0018] Figure 2 It is a sectional view of Embodiment 2 of the present utility model;

[0019] Figure 3 It is a sectional view of Embodiment 3 of the present utility model;

[0020] Figure 4 It is a sectional view of Embodiment 4 of the present utility model;

[0021] Figure 5 It is a sectional view of Embodiment 5 of the present utility model;

[0022] Figure 6 It is a sectional view of Embodiment 6 of the present utility model;

[0023] Figure 7 It is a sectional view of Embodiment 7 of the present utility model;

[0024] Figure 8 It is a sectional view of Embodiment 8 of the present utility model;

[0025] Figure 9 It is a sectional view of Embodiment 9 of the present utility model;

[0026] Figure 10 It is a sectional view of the roll - formed profile of the present utility model in performance testing;

[0027] Figure 11 It is a sectional view of the traditional day - shaped high - strength steel anti - collision beam structure in performance testing;

[0028] Figure 12 It is a sectional view of the mu - shaped high - strength steel anti - collision beam structure in performance testing;

[0029] Figure 13 It is a sectional view of the B - shaped high - strength steel anti - collision beam in performance testing;

[0030] Figure 14 It is a bending moment curve graph of four profile specimens;

[0031] Figure 15 It is an energy absorption curve graph of four profile specimens.

[0032] In the figure, 1 is the first cavity, 1-1 is the first upper wall, 1-2 is the left side wall, 1-3 is the first middle rib, 1-4 is the first edge hook, 1-5 is the first folded edge, 2 is the second cavity, 2-1 is the second upper wall, 2-2 is the right side wall, 2-3 is the second middle rib, 2-4 is the second edge hook, 2-5 is the second folded edge, 3 is the lower wall, 4 is the U-shaped groove, and 5 is the welding point. Specific implementation mode

[0033] The present utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0034] A high energy absorption and lightweight roll-formed profile. The roll-formed profile is a "day"-shaped closed structure obtained by cold-bending a steel plate multiple times, and includes a first cavity 1 and a second cavity 2 arranged in parallel. The first cavity 1 and the second cavity 2 are separated by a double-layer reinforcing rib.

[0035] As Figure 1 shown, the roll-formed profile includes a first upper wall 1-1, a second upper wall 2-1, a left side wall 1-2, a right side wall 2-2, a lower wall 3, a first middle rib 1-3 and a second middle rib 2-3. The first upper wall 1-1, the left side wall 1-2, the left half of the lower wall 3, and the first middle rib 1-3 enclose to form the first cavity 1. The second upper wall 2-1, the right side wall 2-2, the right half of the lower wall 3, and the second middle rib 2-3 enclose to form the second cavity 2. The first middle rib 1-3 and the second middle rib 2-3 are arranged side by side and welded together to form a double-layer reinforcing rib. The end of the double-layer reinforcing rib is welded to the lower wall 3 to realize the closure of the first cavity 1 and the second cavity 2. The first cavity 1 and the second cavity 2 are formed by relative inner winding and bending. The first cavity 1 is first closed and welded for the first time to form a shape. Then, the second cavity 2 is closed, and at the same time, the second welding is carried out, and finally the two cavities are connected into one body.

[0036] The first cavity 1 and the second cavity 2 are arranged symmetrically about the double-layer reinforcing rib on the left and right, that is, the lengths of the first middle rib 1-3 and the second middle rib 2-3 are the same. The double-layer reinforcing rib can provide enhanced supporting force for both the first cavity 1 and the second cavity 2 at the same time. If the lengths of the first middle rib 1-3 and the second middle rib 2-3 are inconsistent, then a section of the longer middle rib will be supported alone, and its supporting strength will be significantly lower. As a result, the strength and impact resistance of the cavity on that side will decrease, and the strengths of the two cavities on both sides will be inconsistent, which will affect the overall strength of the roll-formed profile and its safety performance.

[0037] For the consideration of the overall strength of the rolled profile, the first cavity 1 and the second cavity 2 are preferably rectangular, that is, the lengths of the left side wall 1-2, the right side wall 2-2, the first middle rib 1-3, and the second middle rib 2-3 are the same. According to the usage requirements of the rolled profile, the rolled profile of the present utility model can also be appropriately deformed. For example, the first cavity 1 and the second cavity 2 are deformed into a trapezoid with double-layer reinforcing ribs symmetrically arranged, the lengths of the left side wall 1-2 and the right side wall 2-2 are the same, the lengths of the first middle rib 1-3 and the second middle rib 2-3 are the same, and the length of the left side wall 1-2 / right side wall 2-2 < the length of the first middle rib 1-3 / second middle rib 2-3; at this time, the rolled profile can also maintain a relatively high overall strength.

[0038] There are three connection methods between the ends of the double-layer reinforcing ribs and the lower wall 3, namely edge-hooking welding connection, bending welding connection, and straight welding connection. Among the three welding methods, the edge-hooking welding has the highest connection strength and the straight welding has the lowest connection strength, and it can be selected according to the strength requirements of the specific use purpose of the profile.

[0039] When the edge-hooking welding connection method is adopted, the end of the first middle rib 1-3 extends out a first edge-hooking 1-4 pointing to the inside of the first cavity 1, and the end of the second middle rib 2-3 extends out a second edge-hooking 2-4 pointing to the inside of the second cavity 2. The first edge-hooking 1-4 and the second edge-hooking 2-4 are symmetrically arranged along the double-layer reinforcing ribs. The first edge-hooking 1-4, the second edge-hooking 2-4, and the double-layer reinforcing ribs form a Y-shaped reinforcing rib structure.

[0040] The included angle between the first edge-hooking 1-4 and the second edge-hooking 2-4 is an acute angle, preferably 30° to 60°. There is a rounded smooth transition between the first edge-hooking 1-4 and the first middle rib 1-3, and between the second edge-hooking 2-4 and the second middle rib 2-3.

[0041] The overlapping length between the first edge-hooking 1-4, the second edge-hooking 2-4 and the lower wall 3 is not less than 8 mm. A weld seam extending along the length direction is formed between the first edge-hooking 1-4, the second edge-hooking 2-4 and the lower wall 3 to ensure the welding strength and the impact resistance of the final profile product.

[0042] In order to increase the welding stability, an inverted V-shaped rib 3-1 matching with the Y-shaped reinforcing rib structure is arranged on the lower wall 3. The Y-shaped reinforcing rib structure and the inverted V-shaped rib 3-1 form a mating surface for strengthening the welding connection.

[0043] When the double-layer reinforcing ribs adopt the bending welding connection method, the end of the first middle rib 1-3 extends out a first folded edge 1-5, and the end of the second middle rib 2-3 extends out a second folded edge 2-5; the first folded edge 1-5 and the second folded edge 2-5 are both parallel to the lower wall 3 and are welded and fixed. There is a rounded smooth transition between the first folded edge 1-5 and the first middle rib 1-3, and between the second folded edge 2-5 and the second middle rib 2-3.

[0044] The bends of the first cavity 1 and the second cavity 2 are also rounded corners, reducing stress points and increasing the anti-collision performance. When stressed, the impact force is synchronously transmitted along the symmetrically arranged plates, and the force is more evenly distributed without obstacle dead corners.

[0045] U-shaped grooves 4 for reinforcement are provided on the upper wall and / or the lower wall of the first cavity 1 and the second cavity 2. On the one hand, the U-shaped grooves 4 can strengthen the upper wall and / or the lower wall, and on the other hand, they can reduce the thickness of the used plates under the conditions of the same strength and stiffness. The width and depth of the U-shaped grooves 4 can be adaptively changed according to the boundary conditions of the product to increase the stiffness of the body structure.

[0046] The left side wall 1-2, the right side wall 2-2, and the lower wall 3 are all smooth planes without welded joints, with high surface quality and being easier to assemble and connect during use.

[0047] The following are 3 structural embodiments of the high energy absorption and lightweight roll-formed profile of the present utility model. Appropriate deformations and derivatives based on these three embodiments are all within the protection scope of the present utility model.

[0048] Example 1

[0049] See Figure 1 , the roll-formed profile is a "day"-shaped closed structure obtained by cold bending a steel plate multiple times. The roll-formed profile includes a first upper wall 1-1, a second upper wall 2-1, a left side wall 1-2, a right side wall 2-2, a lower wall 3, a first middle rib 1-3, and a second middle rib 2-3. The first upper wall 1-1, the left side wall 1-2, the left half of the lower wall 3, and the first middle rib 1-3 enclose to form a first cavity 1, and the second upper wall 2-1, the right side wall 2-2, the right half of the lower wall 3, and the second middle rib 2-3 enclose to form a second cavity 2; the first middle rib 1-3 and the second middle rib 2-3 are arranged side by side and welded together to form a double-layer reinforcing rib, and the end of the double-layer reinforcing rib is welded to the lower wall 3 to realize the closure of the first cavity 1 and the second cavity 2. Both the first cavity 1 and the second cavity 2 are rectangular cavities with the same size.

[0050] The end of the first middle rib 1-3 extends a first hook edge 1-4 pointing to the inside of the first cavity 1, and the end of the second middle rib 2-3 extends a second hook edge 2-4 pointing to the inside of the second cavity 2. The first hook edge 1-4, the second hook edge 2-4, the first middle rib 1-3, and the second middle rib 2-3 together form a Y-shaped reinforcing rib structure. An inverted V-shaped rib 3-1 matching the Y-shaped reinforcing rib structure is provided on the lower wall 3. The Y-shaped reinforcing rib structure and the inverted V-shaped rib 3-1 are welded together after being fitted.

[0051] The U-shaped grooves 4 are symmetrically arranged on the first upper wall 1-1 and the second upper wall 2-1 to increase the stiffness of the body structure by strengthening the two upper walls.

[0052] Example 2

[0053] See Figure 2 , the structure of this embodiment is basically the same as that of Embodiment 1, the difference is that: the U-shaped grooves 4 are not provided on the first upper wall 1-1 and the second upper wall 2-1, and the four walls of the roll-formed profile are all flat surfaces.

[0054] Example 3

[0055] See Figure 3 , the structure of this embodiment is basically the same as that of Embodiment 1, the difference is that: the U-shaped grooves 4 are also provided on the bottom walls of the first cavity and the second cavity, and the U-shaped grooves on the upper wall and the lower wall of the first cavity are symmetrically arranged, and the U-shaped grooves on the upper wall and the lower wall of the second cavity are symmetrically arranged.

[0056] Example 4

[0057] See Figure 4 , the structure of this embodiment is basically the same as that of Embodiment 1, the difference is that: in this embodiment, the double-layer reinforcing ribs are connected to the lower wall by flanging welding.

[0058] The end of the first middle rib 1-3 is bent inward by 90° to form the first flange 1-5, and the end of the second middle rib 2-3 is bent inward by 90° to form the second flange 2-5; the first flange 1-5 and the second flange 2-5 are both parallel to the lower wall 3, the lower wall is a flat surface, and they are welded together after being fitted.

[0059] Example 5

[0060] See Figure 5 , the structure of this embodiment is basically the same as that of Embodiment 4, the difference is that: the U-shaped grooves 4 are not provided on the first upper wall 1-1 and the second upper wall 2-1, and the four walls of the roll-formed profile are all flat surfaces.

[0061] Example 6

[0062] See Figure 6 , the structure of this embodiment is basically the same as that of Embodiment 4, the difference is that: the U-shaped grooves 4 are also provided on the bottom walls of the first cavity and the second cavity, and the U-shaped grooves on the upper wall and the lower wall of the first cavity are symmetrically arranged, and the U-shaped grooves on the upper wall and the lower wall of the second cavity are symmetrically arranged.

[0063] Example 7

[0064] SeeFigure 7 , the structure of this embodiment is basically the same as that of Embodiment 1, and the difference lies in that: in this embodiment, a straight welding connection is adopted between the double-layer reinforcing ribs and the lower wall.

[0065] The first middle rib 1-3 and the second middle rib 2-3 are linear, the lower wall is a flat surface, and vertical welding is used to vertically weld the first middle rib and the second middle rib to the lower wall.

[0066] Example 8

[0067] See Figure 8 , the structure of this embodiment is basically the same as that of Embodiment 7, and the difference lies in that: no U-shaped groove 4 is provided on the first upper wall 1-1 and the second upper wall 2-1, and all four walls of the roll-formed profile are flat surfaces.

[0068] Example 9

[0069] See Figure 9 , the structure of this embodiment is basically the same as that of Embodiment 7, and the difference lies in that: U-shaped grooves 4 are also provided on the bottom walls of the first cavity and the second cavity, and the U-shaped grooves on the upper wall and the lower wall of the first cavity are symmetrically arranged, and the U-shaped grooves on the upper wall and the lower wall of the second cavity are symmetrically arranged.

[0070] In the above embodiments, the U-shaped groove 4 is arranged along the length direction of the plate, and its length is the same as that of the plate. Its width and depth can be adaptively changed according to the boundary conditions of the product to increase the stiffness of the body structure. In addition, when it is used as the side beam of the battery case, more flat mounting surfaces are required, and there are no U-shaped grooves on the upper wall and the lower wall.

[0071] Regarding the strength and energy absorption performance of the roll-formed profile, roll-forming with several different structures was used for experimental comparison.

[0072] Specimen 1: The day-shaped high-strength steel anti-collision beam of the present utility model shown in Figure 10 was adopted. The material was selected as HC1030-1300MS high-strength steel, the plate thickness was 1.5 mm, the section size was 125 mm × 50 mm, and it was marked as 1#;

[0073] Specimen 2: The structure of the traditional day-shaped high-strength steel anti-collision beam shown in Figure 11 was adopted. The material was selected as HC1030-1300MS high-strength steel, the plate thickness was 1.61 mm, the section size was 125 mm × 50 mm, and it was marked as 2#;

[0074] Specimen 3: The Figure 12The shown eye-shaped high-strength steel anti-collision beam structure selects HC1030-1300MS high-strength steel as the material. The thickness of the embedded part plate is 1.78 mm, the thickness of the peripheral part plate is 1.2 mm, the section size is 125 mm×50 mm, and it is marked as 3#;

[0075] Specimen 4: Adopt Figure 13 The shown B-shaped high-strength steel anti-collision beam selects HC1030-1300MS high-strength steel as the material. The plate thickness is 1.54 mm, the section size is 125 mm×50 mm, and it is marked as 4#;

[0076] Perform a three-point bending performance test on the above four cross-sections. The bending moment curve is shown in Figure 14 and the energy absorption curve is shown in Figure 15 . The test results are shown in the following table.

[0077]

[0078] It can be seen from the above data that the anti-bending performance and overall quality of the 1# rolled profile are basically the same as those of the 2#, 3#, and 4# rolled profiles; however, the energy absorption peak value of the 1# rolled profile is the highest (7047.72 J), which is significantly higher than that of the other three groups of rolled profiles, proving that the energy absorption effect of the profile of the present invention is excellent.

[0079] The present invention has two cavities and double-layer reinforcing ribs, making the profile have sufficient rigidity; compared with the traditional daily-shaped, eye-shaped, and B-shaped rolled profiles of the same size and weight, it has a higher energy absorption effect, and at the same time has the same strength and bending resistance, meeting the requirements of lightweight and national collision regulations.

[0080] The above are only the preferred embodiments of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope covered by the present invention.

Claims

1. A high energy absorption and lightweight roll-formed profile, characterized in that: The roll-formed profile is a "day"-shaped closed structure formed by cold-bending a steel plate multiple times, including a first cavity (1) and a second cavity (2) arranged in parallel. The first cavity (1) and the second cavity (2) are separated by a double-layer reinforcing rib.

2. The high energy absorption and lightweight roll-formed profile according to claim 1, characterized in that: The first cavity (1) and the second cavity (2) are arranged symmetrically left and right along the double-layer reinforcing rib.

3. A high energy absorption and lightweight roll-formed profile according to any one of claims 1 or 2, characterized in that: The roll-formed profile includes a first upper wall (1-1), a second upper wall (2-1), a left side wall (1-2), a right side wall (2-2), a lower wall (3), a first middle rib (1-3), and a second middle rib (2-3); the first upper wall (1-1), the left side wall (1-2), the lower wall (3), and the first middle rib (1-3) enclose to form the first cavity (1), and the second upper wall (2-1), the right side wall (2-2), the lower wall (3), and the second middle rib (2-3) enclose to form the second cavity (2); the first middle rib (1-3) and the second middle rib (2-3) are welded together to form a double-layer reinforcing rib, and the end of the double-layer reinforcing rib is welded to the lower wall (3).

4. The high energy absorption and lightweight roll-formed profile according to claim 3, characterized in that: The connection mode of the end of the double-layer reinforcing rib and the lower wall (3) is edge welding connection, bent welding connection or straight welding connection.

5. The high energy absorption and lightweight roll-formed profile according to claim 4, characterized in that: When the double-layer reinforcing rib adopts the edge welding connection mode, the end of the first middle rib (1-3) extends out a first edge (1-4) pointing to the inside of the first cavity (1), the end of the second middle rib (2-3) extends out a second edge (2-4) pointing to the inside of the second cavity (2), and the first edge (1-4), the second edge (2-4) and the double-layer reinforcing rib form a Y-shaped reinforcing rib structure.

6. The high energy absorption and lightweight roll-formed profile according to claim 5, characterized in that: An inverted V-shaped rib (3-1) matching with the Y-shaped reinforcing rib structure is arranged on the lower wall (3).

7. The high energy absorption and lightweight roll-formed profile according to claim 4, characterized in that: When the double-layer reinforcing rib adopts the bent welding connection mode, the end of the first middle rib (1-3) extends out a first folded edge (1-5), and the end of the second middle rib (2-3) extends out a second folded edge (2-5); both the first folded edge (1-5) and the second folded edge (2-5) are parallel to the lower wall (3).

8. The high energy absorption and lightweight roll-formed profile according to claim 3, characterized in that: U-shaped grooves (4) for reinforcement are arranged on the upper wall and / or the lower wall of the first cavity (1) and the second cavity (2).

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