Rolled profile with closed section and manufacturing method thereof

Abstract

The invention discloses a closed-section rolling profile which comprises a long profile body and further comprises a plurality of reinforcing ribs arranged on the side wall extending in the length direction of the profile body and arranged in the length direction of the profile body. The reinforcing ribs are arranged to be recessed towards the inner cavity of the profile body or protrude outwards from the plane where the side walls are located. The invention further discloses a manufacturing method of the rolling profile with the closed section. The manufacturing method comprises the steps that the reinforcing ribs are pressed at the positions, corresponding to the side walls, of a plate through a mold; and the plate is made into a closed-section rolling profile by rolling forming.

Description

Technical Field

[0001] The present invention relates to a profile and a manufacturing method thereof, in particular to a closed-section rolled profile and a manufacturing method thereof. Background Art

[0002] Closed-section thin-walled profiles have excellent structural rigidity and are widely used in industries such as transportation and construction. To improve the rigidity of the profile cross-section, geometric features such as reinforcing ribs are often designed into the profile cross-section.

[0003] For example, Chinese patent publication number CN208585331U, published on March 8, 2019, and titled "Sill Beam for Vehicle and Vehicle Having the Same," discloses a sill beam for a vehicle and a vehicle having the same. The patent utilizes an extruded aluminum alloy profile. During the profile processing, geometric reinforcement features are applied along the length of the profile, either through geometric feature reinforcement or localized thickness enhancement.

[0004] For example, the Chinese patent document with publication number CN103557381A and publication date February 5, 2014, entitled "Spiral Wrapped Rib Reinforced Steel Pipe and Special Preparation Equipment and Preparation Method thereof" discloses a structure in which reinforcing ribs are welded to the outside of the steel pipe. After the profile is processed, its interior or exterior can be enhanced with strengthening features by welding, coating, etc.

[0005] For another example, the Chinese patent document with publication number CN117299782A and publication date December 29, 2023, entitled "A method for preparing a variable-strength closed-section part", discloses a structure in which the material strength varies along the length of the part. The profile adopts a method of changing the material strength or thickness along the length of the profile to form a local reinforcement effect.

[0006] The reinforcement structures of the above-mentioned closed structures are all parallel to the length direction of the profile. When subjected to load, the thin walls parallel to the load direction are prone to instability, resulting in a decrease in the bearing capacity of the structure. Summary of the Invention

[0007] One of the objects of the present invention is to provide a closed cross-section roll-formed profile having good lateral load-bearing capacity.

[0008] In order to achieve the above object, the present invention provides a closed cross-section roll-formed profile, which includes an elongated profile body, wherein:

[0009] A plurality of reinforcing ribs are provided on the side walls extending along the length direction of the profile body, and the plurality of reinforcing ribs are arranged along the length direction of the profile body; the reinforcing ribs are arranged to be recessed toward the internal cavity of the profile body or to protrude outward from the plane where the side walls are located.

[0010] Furthermore, in the closed cross-section rolled profile described in the present invention, the plurality of reinforcing ribs maintain a consistent direction of being recessed toward the internal cavity of the profile body or protruding outward from the plane where the side wall is located.

[0011] Furthermore, in the closed cross-section rolled profile described in the present invention, the side wall includes two outer side walls, and each of the outer side walls is provided with the reinforcing rib.

[0012] In other embodiments, the reinforcing rib may be provided on only one of the outer side walls.

[0013] Furthermore, in the closed cross-section rolled profile described in the present invention, the side wall also includes an inner side wall provided inside the profile body to form at least two internal cavities inside the profile body, and the reinforcing ribs are also provided on the inner side wall.

[0014] Furthermore, in the closed cross-section rolled profile of the present invention, the angle α between the side wall and the direction of transverse load loading is ≤30°.

[0015] Furthermore, in the closed cross-section rolled profile described in the present invention, the angle β between the long side extension direction of the reinforcing rib and the transverse load loading direction is ≤45°.

[0016] Furthermore, in the closed-section rolled profile described in the present invention, the reinforcing ribs satisfy l / d2≥1.02, where l represents the curved distance between the midpoints of two adjacent reinforcing ribs in the length direction of the profile body, and the midpoint is the midpoint of the trough position of a single reinforcing rib in its thickness direction; d2 represents the straight-line distance between the troughs of two adjacent reinforcing ribs in the length direction of the profile body.

[0017] Furthermore, in the closed cross-section rolled profile described in the present invention, the reinforcing rib satisfies d1 / t≥4, where t represents the thickness of the reinforcing rib and d1 represents the distance between the upper end of the reinforcing rib and the upper end of the straight section of the side wall.

[0018] Another object of the present invention is to provide a method for manufacturing closed-section rolled profiles, the profile parts produced by this method have good lateral load-bearing capacity, and the method can be combined with conventional roll-forming technology, and its processing and manufacturing process is relatively simple, the overall cost is low, and the versatility is strong.

[0019] In order to achieve the above object, the present invention provides a method for manufacturing a closed cross-section roll-formed profile, comprising the steps of:

[0020] Using a mold to press out the reinforcing ribs at positions corresponding to the side walls of the plate;

[0021] The sheet material is made into a closed cross-section roll-formed profile by roll forming.

[0022] Furthermore, in the manufacturing method described in the present invention, the plate material has a tensile strength greater than 1000 MPa.

[0023] In the present invention, the use of plates with a tensile strength greater than 1000 MPa for processing can ensure the collision energy absorption performance of the structure.

[0024] The closed cross-section rolled profile and the method for manufacturing the same according to the present invention have the following advantages and

[0025] Beneficial effects:

[0026] The closed cross-section roll-formed profile described in the present invention has a high load-bearing capacity and can be combined with a conventional roll-forming process, having the technical advantages of low overall cost and strong versatility.

[0027] The manufacturing method of the closed cross-section rolled profile described in the present invention is relatively simple to manufacture, has low overall cost, and is highly versatile. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A conventional roll-formed part is shown.

[0029] Figure 2 A cross-sectional view of a conventional roll-formed part is shown.

[0030] Figure 3 A schematic diagram of the overall structure of a closed-section roll-formed profile according to one embodiment of the present invention is shown.

[0031] Figure 4 A schematic diagram of the overall structure of the closed-section roll-formed profile according to another embodiment of the present invention is shown.

[0032] Figure 5 Shows Figure 3 Cross-section of the closed section roll-formed profile shown.

[0033] Figure 6 Shows Figure 4 Cross-section of the closed section roll-formed profile shown.

[0034] Figure 7 A side view of a closed cross-section rolled profile according to the present invention is shown in one embodiment.

[0035] Figure 8 Shows Figure 7 View from center AA.

[0036] Figure 9The structural parameter d1 of the closed cross-section roll-formed profile according to the present invention is schematically shown.

[0037] Figure 10 The figure shows a plate with reinforced ribs pressed out in the method for manufacturing a closed-section roll-formed profile according to the present invention.

[0038] Figure 11 The closed-section rolled profile is shown in an intermediate state in the method for manufacturing the closed-section rolled profile according to the present invention.

[0039] Figure 12 The resulting closed cross-section rolled profile is shown. DETAILED DESCRIPTION

[0040] The closed cross-section rolled profile and the manufacturing method thereof described in the present invention will be further explained and illustrated below in conjunction with the drawings and specific embodiments of the specification. However, such explanation and illustration do not constitute an undue limitation to the technical solution of the present invention.

[0041] Figure 1 A conventional roll-formed part is shown.

[0042] Figure 1 An elongated profile is shown, on which a reinforcing rib structure 1 is provided parallel to the longitudinal direction L of the profile.

[0043] Figure 2 A cross-sectional view of a conventional roll-formed part is shown.

[0044] like Figure 2 As shown, for a profile with a reinforcing rib structure 1 parallel to the profile length direction L, when subjected to a transverse load F, the thin wall 2 parallel to the load direction is prone to instability, resulting in a decrease in the structural bearing capacity.

[0045] Based on this, the present invention provides a closed-section roll-formed profile in one embodiment.

[0046] Figure 3 A schematic diagram of the overall structure of a closed-section roll-formed profile according to one embodiment of the present invention is shown.

[0047] like Figure 3 As shown, the closed-section rolled profile includes an elongated profile body, with a plurality of reinforcing ribs 3 provided on side walls 4 extending along the length direction L of the profile body. The plurality of reinforcing ribs 3 are regularly arranged along the length direction L of the profile body. The reinforcing ribs 3 are arranged to be recessed toward the interior cavity of the profile body or to protrude outward from the plane where the side walls 4 are located.

[0048] In some more specific embodiments, the plurality of reinforcing ribs 3 are arranged to be recessed toward the inner cavity of the profile body or to be protruded outward from the plane of the side wall 4. In other words, the reinforcing ribs arranged on the same profile body are arranged to be all protruding or all recessed.

[0049] like Figure 3 As shown, in some more specific embodiments, the side wall 4 of the profile body includes two outer side walls, each of which is provided with a reinforcing rib 3 .

[0050] Figure 4 A schematic diagram of the overall structure of another embodiment of the closed-section roll-formed profile of the present invention is shown.

[0051] like Figure 4 As shown, in another more specific embodiment, the side wall 4 further includes an inner wall 5 provided inside the profile body. The inner wall 5 divides the inner space of the profile body into two internal cavities, and a reinforcing rib 3 is also provided on the inner wall 5 .

[0052] Figure 5 Shows Figure 3 Cross-section of the closed section roll-formed profile shown.

[0053] Figure 6 Shows Figure 4 Cross-section of the closed section roll-formed profile shown.

[0054] like Figure 5 and Figure 6 As shown, in some embodiments, the angle α between the side wall 4 of the closed cross-section rolled profile and the transverse load loading direction F is ≤ 30°.

[0055] It should be noted that when the angle α between the sidewall and the transverse load direction is 0°, the sidewall 4 of the closed-section roll-formed profile will be parallel to the transverse load direction F, that is, the sidewall 4 is set completely vertically, and the cross-section of the closed-section roll-formed profile is rectangular. When α is greater than 0°, the sidewall 4 is tilted at a certain angle with respect to the vertical direction, and the cross-section of the closed-section roll-formed profile is an inverted trapezoid.

[0056] Figure 7 A side view of a closed cross-section rolled profile according to the present invention is shown.

[0057] like Figure 7 As shown, in some embodiments, the angle β between the long side extension direction of the reinforcing rib and the transverse load application direction F is ≤ 45°. It should be noted that when the angle β between the long side extension direction of the reinforcing rib and the transverse load application direction F is 0°, the long side extension direction of the reinforcing rib is the height direction of the profile body, which is perpendicular to the length direction of the profile body.

[0058] Figure 8 Shows Figure 7 View from center AA.

[0059] like Figure 8 As shown, in some embodiments, the reinforcing ribs satisfy l / d2 ≥ 1.02. Here, l represents the curvilinear distance between the midpoints 6 of two adjacent reinforcing ribs along the length of the profile body, where the midpoint 6 is the midpoint of the trough of a single reinforcing rib along its thickness; and d2 represents the linear distance between the troughs of two adjacent reinforcing ribs along the length of the profile body.

[0060] This embodiment of the present invention can ensure that the side wall has at least 2% plastic deformation by controlling l / d2≥1.02, thereby further improving the implementation effect of the present invention.

[0061] like Figure 9 As shown, in some embodiments, the reinforcing rib satisfies d1 / t≥4, where t represents the thickness of the reinforcing rib, which is also the thickness of the side wall and the wall thickness of the profile body; d1 represents the distance between the upper end of the reinforcing rib and the upper end of the straight section of the side wall.

[0062] This embodiment of the present invention facilitates improving the manufacturing convenience of the closed-section roll-formed profile by controlling the reinforcing ribs to satisfy d1 / t≥4.

[0063] In another embodiment, the present invention further provides a method for manufacturing the closed cross-section roll-formed profile, which may include the following steps:

[0064] (1) Use a mold to press out reinforcement ribs on the corresponding side wall of the plate, such as Figure 10 shown;

[0065] (2) The sheet is made into a closed cross-section roll-formed profile by roll forming.

[0066] In some more specific embodiments, in order to ensure the collision energy absorption performance of the structure, ultra-high strength steel material with a tensile strength of more than 1000 MPa is used as the plate.

[0067] Figure 10 The figure shows a plate with reinforced ribs pressed out in the method for manufacturing a closed-section roll-formed profile according to the present invention.

[0068] Figure 11 The closed-section rolled profile is shown in an intermediate state in the method for manufacturing the closed-section rolled profile according to the present invention.

[0069] Figure 12 The invention shows a closed-section rolled profile product.

[0070] Figure 10 、 Figure 11 and Figure 12 A specific manufacturing example is shown.

[0071] like Figure 10 As shown in the example, HC820 / 1180DP is used as the sheet material. After uncoiling, a die is used to press three rows of reinforcing ribs on the sheet corresponding to the side walls. Then, a roll forming process is used for processing. After roll forming, laser welding, roll forming, secondary laser welding, and correction steps, the final part processing is completed, and the result is as shown below. Figure 12 Finished closed section roll-formed section shown.

[0072] like Figure 12 As shown, the closed-section rolled profile has an inner and outer sidewall, forming a dual cavity. Ribs are provided on both the inner and outer walls. The two outer wall ribs are concave toward the profile, while the middle wall rib is concave toward one cavity, enhancing the part's lateral load-bearing capacity. In this example, the outer wall forms an angle α of 5° with the direction of transverse load application F, and the angle β of the rib's long side with the direction of transverse load application is 5°.

[0073] In addition, the thickness of the reinforcement rib is t = 1.2 mm, the distance between the upper end of the reinforcement rib and the upper end of the straight section of the side wall is d1 = 5 mm, d1 / t = 4.17; the curved distance between the midpoints of two adjacent reinforcement ribs in the length direction of the profile body is l = 21.15 mm, and the straight-line distance between the troughs of two adjacent reinforcement ribs in the length direction of the profile body is d2 = 20 mm, l / d2 = 1.0575.

[0074] It can be seen that the closed-section roll-formed profile produced by the present invention has a high load-bearing capacity and can be combined with a conventional roll-forming process, having the technical advantages of low overall cost and strong versatility.

[0075] It should be noted that the prior art within the scope of protection of the present invention is not limited to the embodiments given in this application document. All prior art that does not contradict the solutions of the present invention, including but not limited to prior patent documents, prior publications, prior public uses, etc., can be included in the scope of protection of the present invention.

[0076] In addition, the combination of the various technical features in this case is not limited to the combination described in the claims of this case or the combination described in the specific embodiments. All technical features recorded in this case can be freely combined or combined in any way unless there is a contradiction between them.

[0077] It should also be noted that the above-listed embodiments are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above-listed embodiments. Similar variations or modifications that can be directly derived from or easily conceived by those skilled in the art based on the disclosure of the present invention should fall within the scope of protection of the present invention.

Claims

1. A closed cross-section rolled profile comprising an elongated profile body, characterized in that: A plurality of reinforcing ribs are provided on the side walls extending along the length direction of the profile body, and the plurality of reinforcing ribs are arranged along the length direction of the profile body; the reinforcing ribs are arranged to be recessed toward the internal cavity of the profile body or to protrude outward from the plane where the side walls are located.

2. The closed cross-section rolled profile according to claim 1, wherein: The plurality of reinforcing ribs are recessed toward the inner cavity of the profile body or protruded outward from the plane where the side wall is located in a consistent direction.

3. The closed cross-section rolled profile according to claim 1, wherein: The side wall includes two outer side walls, and each outer side wall is provided with the reinforcing rib.

4. The closed cross-section rolled profile according to claim 3, wherein: The side wall further includes an inner side wall arranged inside the profile body to form at least two internal cavities inside the profile body, and the reinforcing ribs are also arranged on the inner side wall.

5. The closed cross-section rolled profile according to claim 1, wherein: The angle α between the side wall and the direction of loading of the transverse load is ≤30°.

6. The closed cross-section rolled profile according to claim 1, wherein: The included angle β between the long side extension direction of the reinforcing rib and the transverse load loading direction is ≤45°.

7. The closed cross-section rolled profile according to claim 1, wherein: The reinforcing ribs satisfy l / d2≥1.02, where l represents the curved distance between the midpoints of two adjacent reinforcing ribs in the length direction of the profile body, and the midpoint is the midpoint of the trough position of a single reinforcing rib in its thickness direction; d2 represents the straight-line distance between the troughs of two adjacent reinforcing ribs in the length direction of the profile body.

8. The closed cross-section rolled profile according to claim 1, wherein: The reinforcing rib satisfies d1 / t≥4, wherein t represents the thickness of the reinforcing rib, and d1 represents the distance between the upper end of the reinforcing rib and the upper end of the straight section of the side wall.

9. The method for manufacturing a closed cross-section roll-formed profile according to any one of claims 1 to 8, characterized in that: Including steps: Using a mold to press out the reinforcing ribs at positions corresponding to the side walls of the plate; The sheet material is made into a closed cross-section roll-formed profile by roll forming.

10. The closed cross-section rolled profile according to claim 9, wherein: The plate has a tensile strength greater than 1000 MPa.

Images