Steel-aluminum composite forming structure

Abstract

The utility model provides a steel and aluminum composite forming structure which comprises a steel component and an aluminum component formed by composite casting of the steel component. A first folded part folded from one end of the main body part; and a second folded part which is folded from the other end of the main body part opposite to the one end, the aluminum component is provided with: a fixed connection part which can fix the aluminum component to the steel component; the reinforcing rib and the fixed connecting part are integrally formed, and the aluminum part is connected to the steel part through the fixed connecting part so as to be integrally formed with the steel part. Through a casting composite forming mode, the advantages of high strength of an ultrahigh tension steel component and light weight and high rigidity of a die-casting aluminum component are combined, the defects of an existing steel-aluminum combined structure are overcome, meanwhile, the rigidity strength, the light weight level and the design freedom degree of a vehicle body can be improved, and the connecting cost can be reduced.

Description

Technical Field

[0001] This utility model relates to a steel-aluminum composite molding structure, and particularly to a steel-aluminum composite molding structure for car body structures used in the automotive technology field. Background Technology

[0002] Steel-aluminum composite structures combine the high strength and wear resistance of steel with the lightweight, excellent electrical and thermal conductivity of aluminum, making them widely used in the automotive industry, especially in vehicle body structures. In particular, with the increasing demand for lightweight and high-strength materials in the automotive industry in recent years, steel-aluminum composite structures have received increasing attention. Utility Model Content

[0003] The problem to be solved by utility models

[0004] However, due to the significant differences in material properties between steel and aluminum, it is difficult to ensure the strength of steel-aluminum composite structures.

[0005] Existing steel-aluminum joints primarily employ mechanical connection methods, such as interlocking or snap-fit ​​connections, self-piercing riveting (SPR), and flow-drill screw (FDS) connections. However, these connection methods suffer from limitations in load-bearing capacity / depth and are unsuitable for ultra-high-tensile steel or thick aluminum components. Furthermore, existing steel-aluminum hybrid structures still require improvement in terms of connection costs, design freedom, and production efficiency.

[0006] The purpose of this utility model is to provide a novel steel-aluminum composite molding structure for car bodies, which combines the high strength of ultra-high tensile steel components with the lightweight and high rigidity of die-cast aluminum components through casting composite molding, thereby solving the shortcomings of existing steel-aluminum composite structures. At the same time, it can improve the rigidity and strength of the car body, the level of lightweighting, the degree of design freedom, and reduce the connection cost.

[0007] Methods for solving problems

[0008] The first aspect of this utility model provides a steel-aluminum composite molding structure, including a steel component and an aluminum component cast together with the steel component. The steel component has: a main body portion; a first folded portion folded up from one end of the main body portion; and a second folded portion folded up from the other end of the main body portion opposite to the first folded portion. The aluminum component has: a fixed connecting portion capable of fixing the aluminum component to the steel component; and a reinforcing rib integrally formed with the fixed connecting portion. The aluminum component is connected to the steel component through the fixed connecting portion and thus forms an integral part with the steel component.

[0009] In the above-described steel-aluminum composite molding structure, the main body is generally plate-strip shaped. Multiple through holes are formed in the main body, the first folded portion, and the second folded portion, extending through the steel component in the thickness direction. Multiple fixed connection portions are provided, each corresponding to one of the through holes. Each fixed connection portion includes a first connecting boss, a second connecting boss, and a boss connecting portion connecting the first connecting boss and the second connecting boss. The first connecting boss is located on one side of the steel component in the thickness direction and is in close contact with the steel component. The second connecting boss is located on the other side of the steel component in the thickness direction and is in close contact with the steel component. The boss connecting portion is disposed within the through hole with an interference fit. The first connecting boss and the second connecting boss are connected to the boss connecting portion in a manner that tightly clamps the steel component in the thickness direction and covers the through hole.

[0010] In the above-mentioned steel-aluminum composite molding structure, the first folded portion and the second folded portion are both folded up perpendicularly to the main body portion, and are arranged symmetrically and parallel to each other across the main body portion. The reinforcing rib is located between the first folded portion and the second folded portion, and is connected to the second connecting boss located on the other side of the thickness direction.

[0011] In the above-mentioned steel-aluminum composite molding structure, the first connecting boss, the second connecting boss, the boss connecting part, and the reinforcing rib are integrally formed by integral molding.

[0012] In the above-described steel-aluminum composite molding structure, the first connecting boss and the second connecting boss are symmetrically arranged relative to the steel component in the thickness direction. On one side of the steel component in the thickness direction, a plurality of the first connecting bosses are connected together to form a continuous strip with a specified width. On the other side of the steel component in the thickness direction, corresponding to the plurality of the first connecting bosses, a plurality of the second connecting bosses are connected together to form a continuous strip with a specified width. The reinforcing rib is arranged along the plurality of connected second connecting bosses, and the specified width is the size that can cover the through hole.

[0013] In the above-mentioned steel-aluminum composite molding structure, the multiple through holes on the main body are arranged in a pattern with multiple intersecting shapes. The multiple first connecting bosses located on one side of the thickness direction of the main body are correspondingly formed in a pattern with multiple intersecting shapes. The multiple second connecting bosses located on the other side of the thickness direction of the main body are also correspondingly formed in a pattern with multiple intersecting shapes. The multiple through holes on the first folded portion and the second folded portion are arranged in a pattern with multiple elongated shapes that are perpendicular to and parallel to each other relative to the extension direction of the first folded portion and the second folded portion. The first connecting bosses and the second connecting bosses on the first folded portion and the second folded portion are formed in a pattern with multiple rectangles spaced apart along the extension direction.

[0014] The second aspect of this utility model provides a steel-aluminum composite molding structure. In the above-mentioned steel-aluminum composite molding structure, in each of the fixed connection parts, the first connecting boss and the boss connecting part are integrally formed into a snap-lock structure. The boss connecting part, as the nail foot of the snap-lock structure, is inserted into the through hole from one side of the thickness direction of the steel component to the other side of the thickness direction in an interference fit manner. It is fixedly connected to the second connecting boss located on the other side of the thickness direction of the steel component in such a way that the steel component is tightly clamped by the first connecting boss and the second connecting boss and the through hole is covered.

[0015] The third aspect of this utility model provides a steel-aluminum composite molding structure. In the above-mentioned steel-aluminum composite molding structure, the main body is integrally plate-strip shaped, the fixed connection part has a main body connection part connected to the main body, one side of the thickness direction of the main body is a flat surface, and a plurality of steel connecting plates are provided on the other side of the thickness direction of the main body. The steel connecting plates include a first steel connecting plate and a second steel connecting plate perpendicularly connected to the first steel connecting plate. The cross-sectional shape of the steel connecting plate is formed in the shape of the English letter L. The first steel connecting plate is connected to the main body and is wrapped by the main body connection part, and the second steel connecting plate is wrapped by the reinforcing rib. The main body connection part and the reinforcing rib are integrally formed by integral molding. The plurality of steel connecting plates are arranged obliquely relative to the extension direction of the main body and are parallel to each other, or the plurality of steel connecting plates are arranged obliquely relative to the extension direction of the main body and intersect each other in pairs.

[0016] In the above-described steel-aluminum composite molding structure, the first folded portion and the second folded portion are each formed with a plurality of through holes extending through the thickness direction of the steel component. The fixed connection portion also includes a plurality of folded portion connecting portions connected to the first folded portion and the second folded portion. The folded portion connecting portion includes: a first connecting boss, a second connecting boss, and a boss connecting portion connecting the first connecting boss and the second connecting boss. The first connecting boss is located on one side of the thickness direction of the steel component and is in close contact with the steel component. The second connecting boss is located on the other side of the thickness direction of the steel component and is in close contact with the steel component. The boss connecting portion is disposed in the through hole with an interference fit. The first connecting boss and the second connecting boss are connected to the boss connecting portion in such a way that they tightly clamp the steel component in the thickness direction and cover the through hole.

[0017] In the above-mentioned steel-aluminum composite molding structure, the aluminum component is formed integrally with the steel component by die casting.

[0018] In the above-mentioned steel-aluminum composite molding structure, a third folding part is provided in the first folding part, which folds up from the end of the first folding part that is not connected to the main body part, and a fourth folding part is provided in the second folding part, which folds up from the end of the second folding part that is not connected to the main body part. Welding areas are provided in the third folding part and the fourth folding part.

[0019] Utility Model Effect

[0020] According to the steel-aluminum composite molding structure of this utility model, by casting composite molding, it is possible to combine the high strength of ultra-high tensile steel components and the lightweight and high rigidity of die-cast aluminum components, thereby solving the shortcomings of existing steel-aluminum composite structures. At the same time, it can improve the rigidity and strength of the vehicle body, the level of lightweighting, the degree of design freedom, and reduce the connection cost.

[0021] When used in a vehicle body structure, the steel-aluminum composite molding structure described above enhances the rigidity and strength of the vehicle body. Combining the high strength of ultra-high-tensile steel components with the high rigidity of die-cast aluminum components significantly improves the overall rigidity of the body. Furthermore, it achieves weight reduction; by using lightweight aluminum components, compared to traditional pure steel components, both increased rigidity and structural lightness are achieved. Additionally, it increases design freedom. Through casting (e.g., die casting) composite molding processes, internal reinforcing rib structures can be freely designed (e.g., using topology optimization analysis and other design methods to design internal reinforcing rib structures relatively freely), thereby optimizing the vehicle body structure design. Moreover, it reduces connection costs; steel welding areas can be retained by design, reducing the need for dissimilar material connections and eliminating the need for additional connection methods such as SPR and FDS, thus lowering production costs and requiring no further factory modifications, while improving connection quality. Finally, it improves production efficiency; the integrated steel-aluminum composite molding structure reduces the number of components and simplifies the production process. Attached Figure Description

[0022] Figure 1 This is a perspective view of the overall structure of the steel-aluminum composite molding structure according to the first embodiment of this utility model;

[0023] Figure 2 This is a perspective view of the steel component in the steel-aluminum composite molding structure according to the first embodiment of this utility model;

[0024] Figure 3 This is a perspective view of the aluminum component in the steel-aluminum composite molding structure according to the first embodiment of this utility model.

[0025] Figure 4 yes Figure 1 A partial cross-sectional view of line AA shown;

[0026] Figure 5 yes Figure 1 Partial cross-sectional view of the BB line shown;

[0027] Figure 6 This is a perspective view of the overall structure of the steel-aluminum composite molding structure according to the second embodiment of this utility model;

[0028] Figure 7 This is a perspective view of the snap-like structure in the steel-aluminum composite molding structure according to the second embodiment of this utility model;

[0029] Figure 8 This is a perspective view of the steel component with the snap-like structure installed according to the second embodiment of this utility model;

[0030] Figure 9 yes Figure 8 A partial cross-sectional view of the CC line shown;

[0031] Figure 10 This is a perspective view of a steel component with a steel connecting plate connected to it, according to the third embodiment of this utility model.

[0032] Figure 11 This is a perspective view of the steel-aluminum composite molding structure with aluminum components installed according to the third embodiment of this utility model.

[0033] Figure 12 yes Figure 11 Partial cross-sectional view of the DD line shown;

[0034] Figure 13 This is a specific embodiment of the present invention.

[0035] Label Explanation

[0036] A: Steel-aluminum composite molding structure

[0037] 1: Steel components

[0038] 11: Main body

[0039] 12: First fold

[0040] 13: Second fold

[0041] 14: The third fold

[0042] 15: The fourth fold begins

[0043] 2: Aluminum components

[0044] 21(23, 33): Fixed connection part

[0045] 211(231): First connecting boss

[0046] 212(232): Second connecting boss

[0047] 213(233): Boss connection part

[0048] 331: Main body connection part

[0049] 332: Folding section connection part

[0050] 22: Reinforcing ribs

[0051] 4: Fastener-like structure

[0052] 41: Nail foot

[0053] 5: Steel connecting plates

[0054] 51: First steel connecting plate

[0055] 52: Second steel connecting plate

[0056] H: Through hole

[0057] W: Continuous strip (continuous strip structure)

[0058] M: Intersecting shape (intersecting structure)

[0059] R: Rectangle (rectangular structure)

[0060] X: One side in the thickness direction of the steel component

[0061] Y: The other side in the thickness direction of the steel component (the side where the reinforcing rib is located).

[0062] It should be understood that, for the sake of simplification and / or clarity, the elements shown in the accompanying drawings are not necessarily drawn to scale. For example, the dimensions of some elements may be exaggerated relative to others for clarity. Furthermore, to facilitate understanding of the concept of this invention, elements known in the art have been omitted or only partial views of certain parts have been shown in the drawings. The dimensions in the drawings do not represent the precise dimensions and / or scale of the various elements depicted herein. Detailed Implementation

[0063] The present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the various specific embodiments and examples described in this invention are merely examples of complete description and do not limit the scope of protection of this invention. All other embodiments obtained by those skilled in the art based on the specific embodiments and examples of this invention without creative effort are within the scope of protection of this invention.

[0064] In the following description, several specific details are set forth. However, the embodiments described herein can be implemented without certain specific details. In particular, well-known structures and techniques are not shown in detail in the specific embodiments to avoid ambiguity in understanding the specification.

[0065] It should be understood that ordinal adjectives such as “first,” “second,” “third,” etc., may be used in this document to refer to elements. Unless explicitly stated otherwise, this is only used to distinguish different elements and does not imply that the elements mentioned must be in a given order in time, space, or other respects.

[0066] Furthermore, for ease of explanation, the following description uses terms such as "up," "down," "left," "right," "horizontal," "vertical," "front," "back," "top," "bottom," "inner," and "outer" to indicate orientation. However, these terms only limit the relative positional relationship between the components in a specific posture, such as that shown in the attached figure. The use of these terms does not restrict the components. If the specific posture changes, the terms indicating orientation will naturally change accordingly.

[0067] In this utility model, unless otherwise specified, the terms "connection" and "fixed" should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part of a structure; "connection" can mean a mechanical connection or an electrical connection, and can be a direct connection or an indirect connection through an intermediate medium. Furthermore, the terms "up-down direction," "front-back direction," "left-right direction," "width direction," "length direction," "parallel," "perpendicular," and "vertical" in this utility model are not limited to strictly geometric directions (vertical up-down (vertical up-down) and front-back, left-right, parallel, and perpendicular), and may also include cases where the direction is slightly tilted relative to the above directions. The descriptions of directions are merely for ease of understanding, and the structures in the figures do not necessarily need to meet the corresponding directional requirements.

[0068] Furthermore, it should be understood that the terms “approximately” or “about” may be used in this document to modify numerical values, indicating that they are within the normal tolerance range in this field.

[0069] In addition, the contents shown in the attached drawings are for illustrative purposes only and do not represent the actual structure of the product. For ease of explanation and understanding, the proportions of each component may not be consistent with the actual product.

[0070] The present invention will now be described in detail with reference to the accompanying drawings.

[0071] In the steel-aluminum composite molding structure of the first embodiment of this utility model, such as Figures 1-5 As shown, the steel-aluminum composite molding structure A mainly includes a steel component 1 and an aluminum component 2 tightly connected to it. The steel component 1 and the aluminum component 2 are formed into a whole by composite casting and are tightly connected to each other. In a specific embodiment, for example, the steel component 1 can be formed as a whole by stamping or other processing methods, and then the aluminum component 2 can be integrally formed by die casting or other processing methods, so that the steel component 1 and the aluminum component 2 are integrated (details to be described later).

[0072] In one specific embodiment, such as Figure 1 and Figure 2 As shown, the steel component 1 is generally in the shape of a sheet (strip), and mainly includes: a sheet-strip shaped main body 11; and a section extending from one end of the main body 11 ( Figure 1 and Figure 2 The first folded portion 12 (the upper part) is folded up; and the other end of the main body 11 opposite to the aforementioned end ( Figure 1 and Figure 2 The second folded portion 13 (located at the lower end) is folded up. In a specific embodiment of this utility model, the folding directions of the first folded portion 12 and the second folded portion 13 are the same, that is, both face towards... Figure 1 On the right side of the middle.

[0073] Additionally, it can also be located at the end of the first folding portion 12 that is not connected to the main body portion 11. Figure 1 A third folding portion 14 is provided at the right-hand end of the second folding portion 13, which folds upwards further from this point. Similarly, a third folding portion 14 can also be provided at the end of the second folding portion 13 that is not connected to the main body portion 11. Figure 1 A fourth folding portion 15 is provided at the right end of the structure, folding downwards further from this point. By further providing the third folding portion 14 and the fourth folding portion 15, welding areas can be provided on the third folding portion 14 and the fourth folding portion 15 to facilitate connection with other surrounding steel structures by welding, thereby simplifying production and reducing the connection of dissimilar materials. However, the above is merely an example, and this utility model is not limited to this. For example, the third folding portion 14 and the fourth folding portion 15 can be used for other purposes, or they can be omitted. In addition, the so-called plate or strip shape can be approximately plate-shaped or strip-shaped, or have different widths / thicknesses, and may also be irregular in shape.

[0074] In one specific embodiment, such as Figure 2 As shown, the steel component 1 is generally in the shape of a plate (or strip) with a specified thickness, and the main body 11 is generally oriented along a specified direction. Figure 1 and Figure 2 A rectangular plate extending in the left-right direction, the first folded portion 12 folds up approximately perpendicularly to the upper end of the main body portion 11. Figure 2 The middle part is folded up in a roughly horizontal direction), and the second folded part 13 is also folded up roughly perpendicularly to the main body 11 from the lower end of the main body 11. Figure 2 (The fold is roughly horizontal). Furthermore, rounded corners can be provided at the folding positions of the first folding portion 12 and the second folding portion 13 (i.e., the connection position with the main body portion 11). Additionally, the first folding portion 12 and the second folding portion 13 can be configured to be symmetrical and parallel to each other across the main body portion 11. Furthermore, when a third folding portion 14 and a fourth folding portion 15 are provided, the third folding portion 14 can be configured to be perpendicular to the first folding portion 12, and the fourth folding portion 15 can be configured to be perpendicular to the second folding portion 13 (see reference). Figure 2 ).

[0075] Regarding the formation of the steel component 1, it can be integrally formed from sheet metal through processing techniques such as stamping. However, the steel component 1 of this invention is not limited to stamping; it can also be formed by forging, molding, etc., without particular limitation. Considering processing efficiency, stamping is preferred. Furthermore, in the specific embodiments described above, the structure of the steel component 1 is merely an example and can be modified as needed. For example, the folding directions of the first and second folding parts can be opposite, or they can be set to be non-parallel and inclined, or they can be set to have different lengths and widths, etc., and various design changes can be made according to specific usage requirements. Additionally, in this invention, the terms "folding part" and "folding" are merely for ease of explanation. The steel component of this invention does not necessarily have to be formed by bending a single sheet metal; it can also be formed by other methods such as welding or casting. Considering overall strength and processing efficiency, it is preferred that each part of the steel component (the main body and each folding part, etc.) is formed by bending (e.g., stamping) a single sheet metal.

[0076] Next, as Figures 1-5 As shown, in a specific embodiment of the aluminum component 2 of this utility model, the aluminum component 2 has a fixed connection portion 21 and a reinforcing rib 22 integrally formed with the fixed connection portion 21. The fixed connection portion 21 enables the aluminum component 2 to be fixedly connected to the steel component 1, and the aluminum component 2 is fixedly connected to the steel component 1 through the fixed connection portion 21 and thus forms an integral part with the steel component 1.

[0077] In one specific embodiment, such as Figure 2 As shown, a plurality of through holes H are formed in the thickness direction of the steel component 1 (here, in a specific embodiment, such as...). Figure 2 As shown, multiple through holes H are provided in the main body 11, the first folding part 12, and the second folding part 13. The through holes H can be formed, for example, by stamping or other casting methods when forming the entire steel component 1, or by laser processing of the steel component 1 after its overall formation. This invention is not limited in this respect, as long as a through hole H penetrating the thickness of the steel component 1 can be formed. Furthermore, the thickness direction of the steel component 1 varies depending on its location; for example, as... Figure 4 As shown, for the steel component 1 located at the position of the main body 11, its thickness direction refers to... Figure 4 In the left-right direction, for the steel component 1 at the location of the first folded part 12, its thickness direction refers to... Figure 4The vertical direction, i.e., the thickness direction of the steel component 1, refers to the thickness direction of the sheet metal forming it at different locations, and not the overall thickness of the space in which the steel component 1 is located. Furthermore, for ease of explanation, in this invention, the X direction is used as one side of the thickness direction of the steel component 1, and the Y direction is used as the other side of the thickness direction of the steel component 1.

[0078] In a specific embodiment of this utility model, for a steel component 1 with a through hole H, for example, it is placed in a mold cavity, and by means of die casting, the aluminum liquid, which is preheated to 630-670°C, can reach both sides of the steel component 1 through the through hole H. After cooling, an aluminum component 2 and a steel component 1 are integrally formed, so that the aluminum component 2 can be firmly fixed to the steel component 1 and all parts are in close contact, thereby forming the steel component 1 and the aluminum component 2 into one.

[0079] Next, the structure of the aluminum component 2 in the steel-aluminum composite molding structure of a specific embodiment of the present invention, as well as the structural and positional relationship between the steel component 1 and the aluminum component 2, will be described in detail.

[0080] like Figures 3-5 As shown, the aluminum component 2 includes a fixing connection portion 21 for fixing the aluminum component 2 to the steel component 1, and a reinforcing rib 22 integrally formed with the fixing connection portion 21. Figure 3 In the structure shown, the aluminum component 2 is formed integrally by molding, but the aluminum component 2 can also be formed by combining (e.g., welding or die casting) separately formed components (described later), and there is no limitation thereto. In one embodiment of this invention, the aluminum component 2 is integrally formed by a die casting process.

[0081] Reference Figures 3-5 The fixed connection part 21 includes: a first connecting boss 211, a second connecting boss 212, and a boss connecting part 213 connecting the first connecting boss 211 and the second connecting boss 212. The first connecting boss 211 is in close contact with one side surface of the steel component 1 and is located in the thickness direction of the steel component 1. Figure 2 and Figure 3 one side of the XY direction (in the middle) Figure 4 and Figure 5 On the X-direction side), the second connecting boss 212 is in close contact with the other surface of the steel component 1 and is located on the other side of the thickness direction of the steel component 1. Figure 4 and Figure 5 On the Y-direction side), the boss connecting part 213 is preferably disposed in the through hole H in an interference fit manner, forming a first connecting boss 211 and a second connecting boss 212 that are connected to the boss connecting part 213 in such a way that the steel part 1 is tightly clamped in the thickness direction and covers the through hole H.

[0082] In other words, the structure of the fixed connection part 21 is similar to that of a riveting joint. Its first connecting boss 211 and second connecting boss 212 completely cover and enclose the openings of the through holes H on both sides. Furthermore, a boss connecting part 213 is provided within the through hole H to tightly connect the first connecting boss 211 and the second connecting boss 212, ensuring that the fixed connection part 21 is firmly fixed to the through hole H of the steel component 1 and that all components are in close contact. At this time, because the reinforcing rib 22 is integrally formed with the fixed connection part 21, the entire aluminum component 2, including the fixed connection part 21 and the reinforcing rib 22, is firmly connected and fixed to the steel component 1, achieving a fixed connection between the steel component 1 and the aluminum component 2.

[0083] In this embodiment, the steel component 1 has multiple through holes H, and the fixed connection part 21 is also provided with multiple corresponding to each through hole H, so that the fixed connection part 21 and the through hole H are in a one-to-one correspondence.

[0084] Regarding the connection between the steel component 1 and the aluminum component 2, as described above, in one specific embodiment, for example, a steel component 1 with a main body 11, a first folded portion 12, a second folded portion 13, a third folded portion 14, and a fourth folded portion 15, and multiple through holes H (which can also be formed using laser technology) or other structures can be pre-formed using processes such as stamping. This component is then placed into a cavity with a pre-designed internal structure. Subsequently, aluminum is melted to a molten aluminum state at an environment of 630–670°C and injected into the cavity containing the steel component 1 for die casting. The molten aluminum can flow through the through holes H to the mold surface at a specified position within the cavity and maintain a specified shape. After processing, sufficient cooling and post-processing (grinding, deburring, removal of sprue and overflow grooves, or necessary machining, etc.) are performed to obtain the desired product. Figure 1 The structure shown is a steel-aluminum composite molding structure A, in which the steel component 1 and the aluminum component 2 are tightly integrated.

[0085] The steel-aluminum composite molding structure described above, especially when used in vehicle body structures, can improve the rigidity and strength of the vehicle body. Combining the high strength of ultra-high-tensile steel components with the high rigidity of die-cast aluminum components significantly enhances the overall rigidity of the vehicle body. Furthermore, it enables weight reduction; by using lightweight aluminum components, compared to traditional pure steel components, both increased rigidity and structural lightness are achieved. Additionally, it increases design freedom. Through casting (e.g., die-casting) composite molding processes, the internal reinforcing rib structure can be freely designed (e.g., using topology optimization analysis and other design methods to design the internal reinforcing rib structure relatively freely). Various design changes can be made to the shape, structure, and positional relationships of the reinforcing ribs according to actual needs, thereby optimizing the vehicle body structure design. Moreover, it reduces connection costs; steel welding areas can be retained through design, reducing the need for dissimilar material connections and eliminating the need for additional connection methods such as SPR and FDS, thus reducing production costs and eliminating the need for factory modifications, while improving connection quality. Furthermore, it improves production efficiency; the integrated steel-aluminum composite molding structure reduces the number of parts and simplifies the production process. Furthermore, the steel-aluminum composite molding structure of this utility model is preferably applied to vehicle body structures, but it can also be used in other fields or structures.

[0086] In addition, for comparison, the inventors of this utility model manufactured traditional pure steel parts or existing steel-aluminum parts under the same usage conditions as comparative examples and compared them with the steel-aluminum composite molding structure of this utility model. The results showed that compared with traditional pure steel parts or steel-aluminum parts, the steel-aluminum composite molding structure of this utility model can reduce the weight by about 8%, while maintaining the same maximum tensile deformation, increasing torsional rigidity by 61%, and increasing bending deformation by 84%. Its overall quality and strength are significantly improved.

[0087] Furthermore, as a more specific embodiment, such as Figures 1-5 As shown, both the first folded portion 12 and the second folded portion 13 are folded vertically relative to the main body portion 11, and are arranged symmetrically and parallel to each other across the main body portion 11. The reinforcing rib 22 is located between the first folded portion 12 and the second folded portion 13, and is located on the other side in the thickness direction. Figure 4 and Figure 5 The first connecting boss 211, the second connecting boss 212, the boss connecting portion 213, and the reinforcing rib 22 are connected to the second connecting boss 212 on the Y-direction side. Furthermore, the first connecting boss 211, the second connecting boss 212, the boss connecting portion 213, and the reinforcing rib 22 are integrally formed. The first connecting boss 211 and the second connecting boss 212 are symmetrically arranged with respect to the steel component 1 in the thickness direction (e.g., on the Y-direction side). Figure 4In the above embodiment, the structure is symmetrical from left to right when located in the main body 1, and symmetrical from top to bottom when located in the first folding part 12. However, the above structure is only a preferred embodiment, and the present invention is not limited to this. It can also be that the first folding part and the second folding part are not parallel and asymmetrical to each other, the first connecting boss, the second connecting boss and the boss connecting part and the reinforcing rib are designed separately and combined with each other through subsequent processing, or the first connecting boss and the second connecting boss are asymmetrically arranged relative to the steel part in the thickness direction of the steel part, etc. Various design changes can be made according to different needs and application objects.

[0088] Additionally, regarding one side of the steel component 1 in the thickness direction ( Figure 4 , Figure 5 The first connecting boss 211 (on one side of the X direction) is as follows: Figure 1 As shown, multiple first connecting bosses 211 can be connected together to form a continuous strip (W) with a specified width. Similarly, on the other side of the steel component 1 in the thickness direction ( Figure 4 , Figure 5 On the Y-direction side of the steel component 1, a plurality of first connecting bosses 211 are corresponding to a plurality of second connecting bosses 212, which are also connected together to form a continuous strip with a specified width. Reinforcing ribs 22 are arranged along the connected plurality of second connecting bosses 212. That is, for the plurality of first connecting bosses 211 on the thickness direction side of the steel component 1, from the thickness direction side of the steel component 1 (… Figure 1 When viewed from the left side, the multiple first connecting bosses 211 are continuously formed into an integral strip structure without separation. Similarly, for the multiple second connecting bosses 212 on the other side of the thickness direction of the steel component 1, from the other side of the thickness direction of the steel component 1 ( Figure 1 When viewed from the right side, multiple second connecting bosses 212 are also continuously formed to form an integral strip structure without separation. In other words, multiple first connecting bosses 211 and multiple second connecting bosses 212 are continuously formed on the surface of the steel component 1 at their respective locations, and are approximately strip-shaped with a specified width, wherein the specified width is only required to cover the size of the through hole H.

[0089] In addition, as other specific embodiments, such as Figure 2 As shown, the multiple through holes H of the main body 1 are arranged in a pattern with multiple intersecting shapes, and the multiple first connecting bosses 211 located on one side of the main body 1 in the thickness direction are also correspondingly formed in a pattern with multiple intersecting shapes M (see reference). Figure 1 Similarly, the plurality of second connecting bosses 212 located on the other side of the thickness direction of the main body 1 are also correspondingly formed into a pattern with a plurality of intersecting M shapes. Furthermore, referring to... Figure 2The plurality of through holes H on the first folding portion 12 and the second folding portion 13 are arranged to have an extending direction relative to the first folding portion 12 and the second folding portion 13. Figure 2 Multiple long strip patterns that are perpendicular and parallel to each other in the left-right direction (e.g.) Figure 2 Of the six through holes H enclosed by the circle Q, three through holes H form a long strip. The first connecting boss 211 and the second connecting boss 212 on the first folded part 12 and the second folded part 13 are also correspondingly formed into a pattern with multiple rectangles spaced apart along the extension direction. Figure 1 The label R in Figure 3 (The part circled in the image). More specifically, with... Figure 2 Taking the area enclosed by circle Q as an example, there are 6 through holes H, corresponding to 6 first connecting bosses 211. However, the 6 first connecting bosses 211 are continuously formed into a long strip without gaps (no boundaries) to form a rectangle. Figure 1 and Figure 2 (Referring to the reference numeral R). At this time, the reinforcing rib 22 is arranged along the pattern of multiple intersecting shapes M and rectangular shapes R formed by the second connecting boss 212, and also forms a continuous intersecting pattern.

[0090] Here, the patterns of the reinforcing ribs 22, the arrangement of the through holes H, and the patterns of the first connecting boss 211 and the second connecting boss 212 are merely examples. Various modifications can be made to each pattern according to different usage requirements and application objects. For example, ... Figure 13 As shown, its reinforcing ribs not only have intersecting patterns, but also rectangular patterns formed by flat plates (similar to partitions). Of course, they can also be other shapes, and this utility model does not have any particular limitations on this.

[0091] Below, refer to Figures 6-9 The second embodiment of this utility model will now be described.

[0092] In the second embodiment, components identical to those in the first embodiment are labeled with the same reference numerals, and their detailed descriptions are omitted. For example, the structure and arrangement of steel component 1, reinforcing rib 22, etc., in the second embodiment are the same as in the first embodiment, and their descriptions are omitted here. Furthermore, even if the overall structure differs, identical components may still exist in different structures. To ensure that the reference numerals correspond between components in different structures, components identical to those in the first embodiment are sometimes labeled with different reference numerals.

[0093] like Figures 6-9 As shown, in the fixed connection portion 23 of the second embodiment, the structure of the first connecting boss and the boss connecting portion differs from that of the first embodiment. In the second embodiment, the first connecting boss 231 and the boss connecting portion 233 are integrally formed into a snap-fit ​​structure 4, wherein, as... Figure 6 and Figure 7 As shown, the boss connecting portion 233 serves as the nail foot portion 41 of the snap-lock structure 4, extending from one side of the steel component 1 in the thickness direction to the other. Figure 9 The steel component 1 is inserted into the through hole H with an interference fit from the X direction towards the Y direction, and is tightly clamped by the first connecting boss 231 and the second connecting boss 232, covering the through hole H, on the other side located in the thickness direction of the steel component 1. Figure 9 The second connecting boss 232 on the Y-direction side is fixedly connected.

[0094] In the second embodiment, the structure of the steel component 1 is the same as that of the first embodiment. However, in the second embodiment, the first connecting boss 231 and the boss connecting part 233 are integrally formed into a snap-fit ​​structure 4. By pre-forming the snap-fit ​​structure 4, the pin foot part 41 of the snap-fit ​​structure 4 can be inserted into the through hole H of the steel component 1 before the die-casting process. Then, the steel component 1 with the snap-fit ​​structure 4 inserted is placed in a cavity with a pre-designed internal structure. Afterward, aluminum is melted to a liquid state at an environment of 630-670°C and injected into the cavity containing the steel component 1 (with the snap-fit ​​structure 4) for die-casting. The molten aluminum fills the cavity at a predetermined position and is fused together with the fixed connecting part 23 (specifically, the pin foot part 41 of the snap-fit ​​structure 4). After the process is completed, after sufficient cooling and post-processing (grinding, deburring, removal of material cake and overflow groove or necessary machining, etc.), the second embodiment can be obtained. Figure 6 The steel component 1 and the aluminum component 2 shown are tightly integrated into a steel-aluminum composite molding structure A.

[0095] In addition, the number and position of the snap-like structure 4 correspond to the number and position of the through holes H. For details on the structure of the through holes H (e.g., number, position and pattern), please refer to the first embodiment, which will not be repeated here.

[0096] The second embodiment of this utility model can achieve the same effect as the first embodiment, and it is more convenient to design the cavity during die casting, thus enriching the design freedom.

[0097] Next, refer to Figures 10-12 The third embodiment of this utility model will be described in detail below.

[0098] Similarly, in the third embodiment, components identical to those in the first and second embodiments are labeled with the same reference numerals and their detailed descriptions are omitted. For example, the structure and arrangement of the steel component 1 in the third embodiment are the same as those in the first and second embodiments, and their descriptions are omitted here. Furthermore, even if the overall structure differs, the same components may still exist in different structures. In order to ensure that the reference numerals correspond between components in different structures, components identical to those in the first embodiment are sometimes labeled with different reference numerals.

[0099] In the third embodiment of this utility model, as Figures 10-12 As shown, the fixed connection portion 33 has a main body connection portion 331 connected to the main body portion 11 and a folding portion connection portion 332 connected to each folding portion (first folding portion and second folding portion). Furthermore, in the third embodiment, the aforementioned through hole H is not formed in the main body portion 11; instead, it is made into a flat surface. Specifically, one side of the main body portion 11 in the thickness direction ( Figure 12 The surface on one side in the X direction is flat, while the surface on the other side in the thickness direction of the main body 11 is flat. Figure 12 On one side of the Y direction, multiple plate-shaped (or strip-shaped) steel connecting plates 5 are provided. Each steel connecting plate 5 includes a first steel connecting plate 51 and a second steel connecting plate 52 perpendicularly connected to the first steel connecting plate 51. The cross-sectional shape of the steel connecting plate 5 is approximately L-shaped (see reference). Figure 12 ).

[0100] In the third embodiment, the first steel connecting plate 51 is connected to the main body 11 and is wrapped by the main body connecting portion 331, while the second steel connecting plate 52 is wrapped by the reinforcing rib 22. The main body connecting portion 331 and the reinforcing rib 2 are integrally formed. In other words, the steel connecting plate 5, composed of the first steel connecting plate 51 and the second steel connecting plate 52, is wrapped by the main body connecting portion 331 and the reinforcing rib 22, which are part of the aluminum component 2, in a manner similar to an embedded part. Therefore, this embodiment strengthens the aluminum component with a simple structure. Furthermore, in the third embodiment, it can also be formed by die-casting molten aluminum onto the steel component 1 connected to the steel connecting plate 5 within the mold cavity, which will not be described further here.

[0101] Furthermore, in one specific embodiment, the plurality of steel connecting plates 5 extend relative to the extension direction of the main body 11 ( Figure 10 and Figure 11The steel connecting plates 5 are arranged obliquely and parallel to each other in the left-right direction, or multiple steel connecting plates 5 are arranged obliquely relative to the extension direction of the main body 11 and intersect in pairs (not shown). However, this utility model has no limitation in this regard, and the shape and arrangement of the steel connecting plates 5 can be arbitrarily designed and changed according to different application scenarios and actual needs. In addition, the so-called L-shaped cross section of the steel connecting plates 5 is not an absolute L-shape. For example, there may be a slight bend or inclination at the end to ensure firm fixation and thus enhance strength.

[0102] Furthermore, the first folding portion and the second folding portion can be the same as in the first and second embodiments described above, that is, the first folding portion 12 and the second folding portion 13 can each be formed with a plurality of through holes extending in the thickness direction of the steel component 1. Further, the fixed connection portion 33 also includes a plurality of folding portion connecting portions 332 connected to the first folding portion 12 and the second folding portion 13. Regarding the folding portion connecting portion 332, for example, it can be the same as in the first embodiment, including a first connecting boss, a second connecting boss, and a boss connecting portion connecting the first connecting boss and the second connecting boss, and the first connecting boss and the second connecting boss are connected to the boss connecting portion in a manner that tightly clamps the steel component in the thickness direction and covers the through holes. Alternatively, it can be the same as in the second embodiment, with a snap-fit ​​structure, or it can be that only the second connecting boss is provided as the folding portion connecting portion 332; there are no particular limitations on this.

[0103] The third embodiment of this utility model can achieve the same effects as the first and second embodiments, and can further simplify the structure, improve quality and increase strength by not providing through holes and by providing steel connecting plates.

[0104] In addition, both the second and third embodiments can be provided in the same way as the first embodiment, with a third folding part that folds up from the end of the first folding part that is not connected to the main body, and a fourth folding part that folds up from the end of the second folding part that is not connected to the main body. Welding areas are provided in the third and fourth folding parts, thereby retaining the steel welding area, reducing the connection of dissimilar materials, eliminating the need for additional connection methods such as SPR and FDS, and reducing production costs.

[0105] in addition, Figure 13 This invention illustrates a specific embodiment of the steel-aluminum composite molding structure, with reference to... Figure 13 The steel-aluminum composite molding structure is roughly elongated, and the internal reinforcing ribs can be formed in either an X-shaped cross or a partition shape with the reinforcing ribs arranged roughly parallel. There are no particular restrictions on this, and the design can be modified according to various needs.

[0106] The embodiments of this utility model have been described above. It should be understood that although this utility model has been described with reference to specific embodiments, those skilled in the art can modify one or more features after reading the specification without departing from the spirit and scope of this utility model. Therefore, this specification is not intended to limit this utility model. Rather, the scope of this utility model is defined only by the appended claims and their equivalents.

Claims

1. A steel-aluminum composite molding structure, comprising a steel component and an aluminum component cast together with the steel component, characterized in that: The steel component has: a main body; a first folded portion folded up from one end of the main body; and a second folded portion folded up from the other end of the main body opposite to the first end. The aluminum component has: a fixing connection portion for fixing the aluminum component to the steel component; and a reinforcing rib integrally formed with the fixing connection portion. The aluminum component is connected to the steel component via the fixed connection portion, thus forming an integral part with the steel component.

2. The steel-aluminum composite molding structure as described in claim 1, characterized in that: The main body is generally plate-strip shaped. Multiple through holes extending through the steel component are formed in the main body, the first folded portion, and the second folded portion, respectively. The fixed connection part has multiple parts, and each fixed connection part corresponds to each of the through holes. The fixed connection part includes: A first connecting boss, a second connecting boss, and a boss connecting portion connecting the first connecting boss and the second connecting boss. The first connecting boss is located on one side of the steel component in the thickness direction and is in close contact with the steel component. The second connecting boss is located on the other side of the thickness direction of the steel component and is in close contact with the steel component. The boss connecting part is disposed in the through hole with an interference fit. The first connecting boss and the second connecting boss are connected to the boss connecting portion in such a way that they tightly clamp the steel component in the thickness direction and cover the through hole.

3. The steel-aluminum composite molding structure as described in claim 2, characterized in that: Both the first folded portion and the second folded portion are folded vertically relative to the main body portion, and are arranged symmetrically and parallel to each other across the main body portion. The reinforcing rib is located between the first folded portion and the second folded portion, and is connected to the second connecting boss located on the other side of the thickness direction.

4. The steel-aluminum composite molding structure as described in claim 3, characterized in that: The first connecting boss, the second connecting boss, the boss connecting portion, and the reinforcing rib are integrally formed by integral molding.

5. The steel-aluminum composite molding structure as described in claim 4, characterized in that: The first connecting boss and the second connecting boss are symmetrically arranged relative to the steel component in the thickness direction. On one side of the steel component in the thickness direction, a plurality of the first connecting bosses are connected together to form a continuous strip with a specified width. On the other side of the thickness direction of the steel component, corresponding to a plurality of first connecting bosses, a plurality of second connecting bosses are connected together to form a continuous strip with a specified width. The reinforcing ribs are arranged along a plurality of second connecting bosses that are connected together. The specified width is the size that can cover the through hole.

6. The steel-aluminum composite molding structure as described in claim 5, characterized in that: The multiple through holes on the main body are arranged in a pattern of multiple intersections. Similarly, the multiple first connecting bosses located on one side of the main body in the thickness direction are also formed in a pattern of multiple intersections, and the multiple second connecting bosses located on the other side of the main body in the thickness direction are also formed in a pattern of multiple intersections. The first folded portion and the second folded portion have multiple through holes arranged in a pattern of multiple elongated strips that are perpendicular to and parallel to each other with respect to the extending direction of the first folded portion and the second folded portion. The first connecting boss and the second connecting boss on the first folded portion and the second folded portion are formed in a pattern of multiple rectangles that are spaced apart along the extending direction.

7. The steel-aluminum composite molding structure as described in claim 2, characterized in that: In each of the aforementioned fixed connection portions, the first connecting boss and the boss connecting portion are integrally formed into a snap-lock structure, wherein... The boss connecting portion, as the nail foot portion of the buckle-like structure, is inserted into the through hole from one side of the steel component in the thickness direction to the other side in the thickness direction in an interference fit manner, and is fixedly connected to the second connecting boss located on the other side of the steel component in the thickness direction in such a way that the steel component is tightly clamped by the first connecting boss and the second connecting boss and the through hole is covered.

8. The steel-aluminum composite molding structure as described in claim 1, characterized in that: The main body is generally plate-strip shaped. The fixed connection part has a main body connection part that is connected to the main body part. One side of the main body in the thickness direction is a flat surface, and multiple steel connecting plates are provided on the other side of the main body in the thickness direction. The steel connecting plate includes a first steel connecting plate and a second steel connecting plate perpendicularly connected to the first steel connecting plate. The cross-sectional shape of the steel connecting plate is formed in the shape of the English letter L. The first steel connecting plate is connected to the main body and is wrapped by the connecting part of the main body. The second steel connecting plate is wrapped by the reinforcing rib. The main body connecting part and the reinforcing rib are integrally formed by molding. The plurality of steel connecting plates are arranged obliquely relative to the extension direction of the main body and are parallel to each other, or the plurality of steel connecting plates are arranged obliquely relative to the extension direction of the main body and are intersecting each other.

9. The steel-aluminum composite molding structure as described in claim 8, characterized in that: The first folded portion and the second folded portion are each formed with a plurality of through holes extending through the thickness direction of the steel component. The fixed connection part also includes a plurality of folding part connecting parts that are connected to the first folding part and the second folding part. The folding section connecting part includes: A first connecting boss, a second connecting boss, and a boss connecting portion connecting the first connecting boss and the second connecting boss. The first connecting boss is located on one side of the steel component in the thickness direction and is in close contact with the steel component. The second connecting boss is located on the other side of the thickness direction of the steel component and is in close contact with the steel component. The boss connecting part is disposed in the through hole with an interference fit. The first connecting boss and the second connecting boss are connected to the boss connecting portion in such a way that they tightly clamp the steel component in the thickness direction and cover the through hole.

10. The steel-aluminum composite molding structure according to any one of claims 1 to 9, characterized in that: The aluminum component is integrally formed with the steel component by die casting.

11. The steel-aluminum composite molding structure as described in claim 10, characterized in that: A third folding portion is provided in the first folding portion, which folds up from the end of the first folding portion that is not connected to the main body portion. The second folding portion is provided with a fourth folding portion that folds up from the end of the second folding portion that is not connected to the main body portion. Welding areas are provided in the third folded portion and the fourth folded portion.

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