Automobile bumper aluminum alloy profile with high fracture toughness

Abstract

The cross section of the high-fracture-toughness automobile bumper aluminum alloy profile is a long-strip-shaped rectangular frame, and a first rib piece and a second rib piece which are parallel to each other are arranged between the short edges of the frame. The first rib piece is provided with a first ring-shaped piece, and first X-shaped reinforcing ribs are arranged in the first ring-shaped piece and matched with the rib piece to divide the rib piece into six equal parts. The second rib piece is provided with a second ring-shaped piece, and a second X-shaped reinforcing rib in the second rib piece equally divides the ring-shaped piece area into six parts. Rib pieces between adjacent ring-shaped pieces and the long edge of the frame are connected with A-shaped reinforcing pieces. The first ring-shaped piece and the second ring-shaped pieces are distributed in a staggered mode, gaps exist between the first ring-shaped piece and the second ring-shaped pieces, and the first ring-shaped piece abuts against the two second ring-shaped pieces to disperse stress. The aluminum alloy profile is made of aluminum alloy materials containing Al-Zn-Mg series, Co, Ni, Mo and other elements, through the unique structure and material design, stress dispersion, energy absorption, structural stability enhancement, stress concentration reduction and effective fracture toughness improvement are achieved, and the aluminum alloy profile is light in weight and high in safety.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive parts, and particularly to an aluminum alloy profile for an automotive bumper with high fracture toughness. Background Art

[0002] As an important safety protection component of an automobile, the automotive bumper plays a role in absorbing and buffering energy and protecting the vehicle body and the passengers inside when the vehicle collides. With the continuous improvement of the requirements for safety and lightweight in the automotive industry, aluminum alloy profiles have gradually become a commonly used material for automotive bumpers due to their light weight and high strength. However, there are still certain deficiencies in the fracture toughness of the existing aluminum alloy profiles for automotive bumpers. When subjected to a large impact force or complex stress, cracks are likely to propagate and even fracture, which cannot fully meet the requirements of automotive safety performance. Therefore, it is of great practical significance to develop an aluminum alloy profile for an automotive bumper with high fracture toughness. Summary of the Invention

[0003] To solve the technical problems in the background art, the present invention proposes an aluminum alloy profile for an automotive bumper with high fracture toughness.

[0004] An aluminum alloy profile for an automotive bumper with high fracture toughness proposed by the present invention, the cross-section of the profile is a long strip-shaped rectangular frame structure; between the two short sides of the rectangular frame, a first rib member and a second rib member are connected in parallel.

[0005] On the first rib member, multiple groups of first circular members are arranged at equal intervals, and the first rib member penetrates through all the first circular members and divides them into two semi-circles equally.

[0006] On the second rib member, multiple groups of second circular members are arranged at equal intervals, and the second rib member penetrates through all the second circular members and divides them into two semi-circles equally.

[0007] The diameter of the first circular member is larger than that of the second circular member, and the first circular member and the second circular member are arranged in an alternating and spaced manner, and there is a gap between the outer side walls of the first circular member and the second circular member.

[0008] Preferably, a first X-shaped reinforcing rib is provided inside the inner circle of each first circular member, the intersection point of the first X-shaped reinforcing rib is located on the straight line where the first rib member is located, and is divided into two parts equally by the first rib member.

[0009] Preferably, between the first rib member between two adjacent first circular members and the long side of the rectangular frame close to the first rib member, a first A-shaped reinforcing member is connected, the tip of the first A-shaped reinforcing member is connected to the first rib member, and the open end is connected to the long side of the rectangular frame.

[0010] Preferably, the inner circle of each of the second circular members is provided with a second X-shaped reinforcing rib. The intersection point of the second X-shaped reinforcing rib is located on the straight line where the second rib member is located and is equally divided into two parts by the second rib member.

[0011] Preferably, a second A-shaped reinforcing member is connected between the second rib member between two adjacent second circular members and the long side of the rectangular frame close to the second rib member. The tip of the second A-shaped reinforcing member is connected to the second rib member, and the open end is connected to the long side of the rectangular frame.

[0012] The unique structure where the tip of the A-shaped reinforcing member is connected to the rib member and the open end is connected to the long side of the rectangular frame enables it, when the profile is stressed, to act like a lever and transfer the stress from the rib member and the circular member to the long side of the rectangular frame in a more efficient manner. In this way, the stress is no longer concentrated locally but is dispersed along the A-shaped structure, reducing the stress peak at the key parts and avoiding premature material failure caused by stress concentration, thereby enhancing the overall fracture resistance of the profile.

[0013] Enhance the overall rigidity of the structure: The A-shaped reinforcing member, together with the first rib member, the second rib member, and the rectangular frame, constitutes a stable triangular structure system. In mechanics, a triangle has good stability. This structure can effectively limit the relative displacement between components and enhance the overall rigidity of the profile. When the car bumper is subjected to a collision and deformed, the A-shaped reinforcing member can inhibit excessive distortion of the structure, maintain the shape of the profile, and ensure that it can continuously perform its protective function.

[0014] Optimize the energy absorption path: During the collision process, the A-shaped reinforcing member itself will undergo elastic or plastic deformation, and this process can absorb part of the collision energy. Moreover, its special shape guides the energy to dissipate along the extension direction of the A-shaped structure, opening up a new path for energy absorption. Acting in coordination with the circular member and the X-shaped reinforcing rib, the profile can absorb more collision energy, reduce the energy transmitted to the vehicle body, and better protect the vehicle and the occupants inside.

[0015] Improve the reliability of the connection part: The A-shaped reinforcing member increases the connection area and connection points between the rib member and the long side of the rectangular frame. Compared with a simple straight-line connection, this connection method is more firm. When the profile frequently bears dynamic loads, the A-shaped reinforcing member can effectively prevent problems such as loosening and disconnection at the connection part, ensure the integrity and reliability of the entire profile structure, and extend the service life of the car bumper.

[0016] Preferably, when the profile is subjected to a collision or bending, each of the first circular members abuts against two second circular members, and is used to disperse the force received by the first circular member to the two second circular members.

[0017] Preferably, the profile is made of aluminum alloy, which contains Al-Zn-Mg alloy elements and is compositely added with at least one trace element of Co, Ni, and Mo.

[0018] Preferably, the four corners of the rectangular frame are all configured as rounded structures.

[0019] In the present invention, a high fracture toughness automobile bumper aluminum alloy profile is proposed, which has the following beneficial effects:

[0020] Stress dispersion and energy absorption: The unique staggered distribution and collision structure of the first and second ring-shaped parts, combined with the X-shaped reinforcement ribs and A-shaped reinforcement parts, enable the profile to quickly disperse stress to multiple parts when it is hit or bent, absorb a large amount of energy through structural deformation, effectively reduce the generation and expansion of cracks, and significantly improve fracture toughness. The X-shaped reinforcement ribs and ribs work together to divide the inside of the ring-shaped part into 6 areas, further refining the stress dispersion path and improving the stress dispersion effect.

[0021] Enhanced structural stability: Multiple groups of reinforcing ribs and ring-shaped parts are interconnected to form a stable three-dimensional structure, which improves the overall strength and rigidity of the profile, making it less likely to deform under complex stress conditions and maintaining the structural integrity of the car bumper. The 6-area support structure constructed by the X-shaped reinforcing ribs further enhances the rigidity of the ring-shaped parts and strengthens the overall structural stability.

[0022] Lightweight design: Aluminum alloy material and optimized structural design are used to reduce the weight of the profile while ensuring high fracture toughness and strength. This is in line with the development trend of lightweight automobiles and helps reduce automobile fuel consumption and exhaust emissions.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a cross-sectional front view of the present invention.

[0026] Explanation of the numbers in the figure: 1. rectangular frame; 2. first rib; 201. first ring-shaped member; 202. first X-shaped reinforcement rib; 203. first A-shaped reinforcement member; 3. second rib; 301. second ring-shaped member; 302. second X-shaped reinforcement rib; 303. second A-shaped reinforcement member. DETAILED DESCRIPTION

[0027] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0028] As Figure 1 - Figure 2 shown, a kind of aluminum alloy profile for automobile bumper with high fracture toughness, the profile is an injection molding part, and the cross-section is a rectangular frame 1 structure in a long strip shape. Between the two short sides of the rectangular frame 1, there are a first rib member 2 and a second rib member 3 arranged in parallel.

[0029] On the first rib member 2, there are multiple groups of first circular members 201 arranged at equal intervals. The first rib member 2 penetrates through all the first circular members 201 and divides them into two semi-circles equally; inside the inner circle of each first circular member 201, there is a first X-shaped reinforcing rib 202. The intersection point of the first X-shaped reinforcing rib 202 is located on the straight line where the first rib member 2 is located and is divided into two parts equally by the first rib member 2; between two adjacent first circular members 201, the first rib member 2 is connected to the long side of the rectangular frame 1 close to this first rib member 2 by a first A-shaped reinforcing member 203. The tip of the first A-shaped reinforcing member 203 is connected to the first rib member 2, and the open end is connected to the long side of the rectangular frame 1.

[0030] On the second rib member 3, there are multiple groups of second circular members 301 arranged at equal intervals. The second rib member 3 penetrates through all the second circular members 301 and divides them into two semi-circles equally; inside the inner circle of each second circular member 301, there is a second X-shaped reinforcing rib 302. The intersection point of the second X-shaped reinforcing rib 302 is located on the straight line where the second rib member 3 is located and is divided into two parts equally by the second rib member 3; between two adjacent second circular members 301, the second rib member 3 is connected to the long side of the rectangular frame 1 close to this second rib member 3 by a second A-shaped reinforcing member 303. The tip of the second A-shaped reinforcing member 303 is connected to the second rib member 3, and the open end is connected to the long side of the rectangular frame 1.

[0031] The diameter of the first circular member 201 is larger than that of the second circular member 301, and the first circular members 201 and the second circular members 301 are arranged in an alternating and spaced manner. There is a gap between the outer side walls of the first circular member 201 and the second circular member 301. When the profile is collided or bent, each first circular member 201 abuts against two second circular members 301, and is used to disperse the force received by the first circular member 201 to the two second circular members 301.

[0032] Stress dispersion mechanism: When the bumper is bent by external force, the first ring-shaped member 201 and the second ring-shaped member 301 collide with each other. This collision can redistribute the stress between the ring-shaped members and the surrounding structures, avoiding stress concentration in a certain local area, thereby reducing the risk of rapid fracture of the material due to stress concentration.

[0033] Function of the reinforcing ribs: The first rib 2, the second rib 3, the first X-shaped reinforcing rib 202, the second X-shaped reinforcing rib 302, the first A-shaped reinforcing rib 203, the second A-shaped reinforcing rib 303 and other structures can enhance the overall strength and rigidity of the profile. These reinforcing ribs can bear part of the load when the material is stressed, and by changing the force transmission path, the crack propagation path is made more tortuous, consuming more energy, which helps to improve the fracture toughness.

[0034] In addition, the profile is made of aluminum alloy, which contains Al-Zn-Mg alloy elements and is compound-added with at least one trace element of Co, Ni, and Mo. The four corners of the rectangular frame 1 are all set to be rounded structures to reduce stress concentration and improve the fatigue resistance of the profile.

[0035] Generally, based on Al-Zn-Mg aluminum alloy, adding appropriate amount of Zn and Mg elements can improve the strength of aluminum alloy. At the same time, adding a small amount of Cu element can improve the corrosion resistance and processing performance of aluminum alloy.

[0036] Composite addition of trace elements such as Co, Ni, and Mo can inhibit recrystallization and grain growth, help obtain a single fibrous grain structure, and thus improve the fracture toughness and corrosion resistance of aluminum alloy profiles.

[0037] Multiple structures buffer stress: When the profile is collided and bent, the rectangular frame 1 as the overall basic structure can withstand a certain external force. At the same time, the first rib 2, the second rib 3 and the A-shaped reinforcement on the frame will work together to disperse the collision force to various parts of the frame. The first A-shaped reinforcement and the second A-shaped reinforcement can transfer the force between adjacent ring-shaped parts to the long side of the rectangular frame 1, so that the entire frame can bear the external force together to avoid excessive local stress. When the first ring-shaped part 201 and the second ring-shaped part 301 are squeezed, the X-shaped reinforcement ribs inside can effectively disperse the force to various parts of the ring-shaped part to prevent the ring-shaped part from breaking due to local stress concentration.

[0038] Interaction of the ring-shaped parts: The first ring-shaped part 201 and the second ring-shaped part 301 are staggered and spaced apart with a small gap between the outer side walls. When the profile is bent, the first ring-shaped part 201 and the second ring-shaped part 301 will conflict with each other. This conflict can change the direction of force transmission and redistribute the stress between the ring-shaped parts. Due to the structural characteristics of the ring-shaped parts, they can produce a certain elastic deformation when they are squeezed against each other, absorbing part of the energy and also hindering the expansion of the cracks. Even if a small crack appears in a ring-shaped part, it is difficult for the crack to continue to expand to other parts under the conflict of the adjacent ring-shaped parts, thereby improving the overall anti-fracture ability of the profile.

[0039] Complex structure hinders crack expansion: Various ribs and rings in the entire mechanism form a complex three-dimensional structure. When a crack appears, it will encounter many obstacles. For example, X-shaped reinforcement ribs and A-shaped reinforcements will make the crack expansion path tortuous. The crack needs to bypass these reinforcement ribs to continue to expand, which consumes more energy and greatly reduces the speed and possibility of crack expansion. In addition, the connection between the ribs and the ring can also limit the propagation of cracks, so that the profile can maintain good integrity and is not easy to break when it is hit and bent.

[0040] In addition, 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 the indicated technical features. Therefore, the features defined as "first" and "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.

[0041] 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.

[0042] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0043] As mentioned above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent replacements or changes, should be covered within the protection scope of the present invention.

Claims

1. An aluminum alloy profile for automotive bumper with high fracture toughness, characterized in that, The cross-section of the profile is in the structure of a long-strip rectangular frame (1); between the two short sides of the rectangular frame (1), first reinforcing members (2) and second reinforcing members (3) are arranged in parallel. On the first reinforcing member (2), multiple groups of first circular members (201) are arranged at equal intervals. The first reinforcing member (2) penetrates through all the first circular members (201) and divides them into two semi-circles equally. On the second reinforcing member (3), multiple groups of second circular members (301) are arranged at equal intervals. The second reinforcing member (3) penetrates through all the second circular members (301) and divides them into two semi-circles equally. The diameter of the first circular member (201) is larger than that of the second circular member (301), and the first circular members (201) and the second circular members (301) are distributed in an alternating and spaced manner. There is a gap between the outer side walls of the first circular member (201) and the second circular member (301).

2. The aluminum alloy profile for automotive bumper with high fracture toughness according to claim 1, characterized in that: Inside the inner circle of each first circular member (201), a first X-shaped reinforcing rib (202) is provided. The intersection point of the first X-shaped reinforcing rib (202) is located on the straight line where the first reinforcing member (2) is located and is divided into two parts equally by the first reinforcing member (2).

3. A high fracture toughness automotive bumper aluminum alloy profile according to claim 1, characterized in that: Between the first reinforcing member (2) between two adjacent first circular members (201) and the long side of the rectangular frame (1) close to the first reinforcing member (2), a first A-shaped reinforcing member (203) is connected. The tip of the first A-shaped reinforcing member (203) is connected to the first reinforcing member (2), and the open end is connected to the long side of the rectangular frame (1).

4. A high fracture toughness aluminum alloy profile for automotive bumpers according to claim 1, characterized in that: Inside the inner circle of each second circular member (301), a second X-shaped reinforcing rib (302) is provided. The intersection point of the second X-shaped reinforcing rib (302) is located on the straight line where the second reinforcing member (3) is located and is divided into two parts equally by the second reinforcing member (3).

5. The aluminum alloy profile for automotive bumper with high fracture toughness according to claim 1, wherein: Between the second reinforcing member (3) between two adjacent second circular members (301) and the long side of the rectangular frame (1) close to the second reinforcing member (3), a second A-shaped reinforcing member (303) is connected. The tip of the second A-shaped reinforcing member (303) is connected to the second reinforcing member (3), and the open end is connected to the long side of the rectangular frame (1).

6. The aluminum alloy profile for automotive bumper with high fracture toughness according to claim 1, wherein: When the profile is collided or bent, each first circular member (201) abuts against two second circular members (301), and is used to disperse the force received by the first circular member (201) to the two second circular members (301).

7. A high fracture toughness automotive bumper aluminum alloy profile according to claim 1, characterized in that: The profile is made of aluminum alloy material, and the aluminum alloy material contains Al-Zn-Mg series alloy elements and is compounded with at least one trace element of Co, Ni, and Mo.

8. The aluminum alloy profile for automobile bumper with high fracture toughness according to claim 1, characterized in that: The four corners of the rectangular frame (1) are all set to be chamfered structures.

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