L-shaped complex profile and cold roll forming method thereof

Abstract

The invention relates to the technical field of profile cold roll forming, in particular to an L-shaped complex profile and a cold roll forming method thereof.The cold roll forming method of the L-shaped complex profile comprises the steps that a long plate and a short plate are prepared for standby application; the long plate is subjected to roll bending treatment, so that the section of the long plate is of an L-shaped structure, and an L-shaped long plate structure is obtained; the short plate is subjected to roll bending treatment, so that the section of the short plate is of an L-shaped structure, and an L-shaped short plate structure is obtained; the L-shaped long plate structure and the L-shaped short plate structure are welded, so that the L-shaped long plate structure and the L-shaped short plate structure are welded together, and an L-shaped complex profile is manufactured; according to the method, the complex and asymmetric L-shaped profile can be integrally formed, meanwhile, welding points are reduced as much as possible, the defect that the performance of a welding area is reduced is overcome, the precision of the section size is ensured, and the service life of the complex L-shaped profile is greatly prolonged.

Description

Technical Field

[0001] This invention relates to the field of cold bending forming technology for profiles, and more particularly to an L-shaped complex profile and its cold bending forming method. Background Technology

[0002] Roll forming is one of the important processes for forming steel structural components. With the development of automation technology, roll-formed parts are increasingly being applied in various fields. However, as the demand for lightweight and precise cross-sectional dimensions of product structural components continues to increase, roll-formed parts are also developing towards greater complexity and precision. Due to the complexity of the roll forming process, the room temperature forming rules for high-strength steel and ultra-high-strength steel plates are not yet fully understood. Therefore, the forming of complex cold-formed profiles, especially L-shaped cold-formed profiles, often relies on worker experience, lacking standardized forming procedures.

[0003] Due to its complex structure and numerous forming challenges such as structural asymmetry and a large number of bending angles, L-shaped cold-formed complex profiles have traditionally been fixed by a large number of welding points. However, this method reduces the strength of the material at the welding points, resulting in a significant reduction in the service life of the L-shaped complex profiles. Summary of the Invention

[0004] The purpose of this invention is to provide an L-shaped complex profile and its cold bending forming method, which can achieve integrated forming of complex and asymmetrical L-shaped profiles, while minimizing welding points, avoiding performance degradation defects in the welding area, ensuring the accuracy of cross-sectional dimensions, and greatly improving the service life of L-shaped complex profiles.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a method for cold bending and forming an L-shaped complex profile, comprising: Prepare one long board and one short board for later use; The long plate is rolled and bent to make the cross-section of the long plate present an L-shaped structure, thus obtaining an L-shaped long plate structure. The short plate is rolled and bent to make the cross-section of the short plate present an L-shaped structure, thus obtaining an L-shaped short plate structure. The L-shaped long plate structure and the L-shaped short plate structure are welded together to produce an L-shaped complex profile.

[0006] The specific steps involved in bending the long plate to create an L-shaped cross-section and producing the L-shaped long plate structure include: From one end of the long board to the other end, the long board is divided into areas A, B, C, D, E, F, G, H, I, J, K, and L in sequence. Using area G as the web reference, area F is rolled multiple times, with each roll bending angle being a. The roll bending angle a is less than the angle required for forming area F. Using areas F and G as webs in sequence, roll bending is performed on areas E and H respectively, with the roll bending angle being the angle required for forming. Using areas E and H as webs in sequence, roll bending is performed on areas D and I respectively, with the roll bending angle being the angle required for forming. Using area D as the web, area C is rolled, with the rolling angle being smaller than the angle required for forming. Using area B as the web, area A is rolled and bent at the angle required for forming. Using area D as the web, area C is rolled and bent at the angle required for forming. Using area C as the web, area B is rolled and bent at the angle required for forming. Using area I as the web, area J is rolled, with the rolling angle being smaller than the angle required for forming. Using area K as the web, area L is rolled and bent at the angle required for forming. Using area I as the web, area J is rolled and bent at the angle required for forming. Using area J as the web, area K is rolled and bent at the angle required for forming. Welding is performed at the connection between area A and area L to produce an L-shaped long plate structure.

[0007] In the step of using region G as the web reference and performing multiple roll bending on region F, with each roll bending angle being 'a', where the roll bending angle 'a' is less than the angle required for forming region F,... The roller bending angle α is 15°, and the angle required for forming zone F is 90°.

[0008] The specific steps involved in bending the short plate to create an L-shaped cross-section, and producing the L-shaped short plate structure, include: From one end of the short board to the other end, the short board is divided into M zone and N zone in sequence; Using region M as the web reference, region N is rolled at the required angle to obtain an L-shaped short plate structure.

[0009] The specific steps involved in welding the L-shaped long plate structure and the L-shaped short plate structure together to produce the L-shaped complex profile include: After connecting the L-shaped long plate structure and the L-shaped short plate structure, the connection between the M, D and C areas is welded, the connection between the M, N, A and L areas is welded, and the connection between the N, I and J areas is welded to obtain the L-shaped complex profile.

[0010] In this process, both long and short plates are formed in multiple passes during each roll bending process.

[0011] Secondly, the present invention also provides an L-shaped complex profile, including an L-shaped long plate structure and an L-shaped short plate structure; the side of the L-shaped long plate structure has a first groove and a second groove, and the L-shaped short plate structure is connected to the L-shaped long plate structure and located on the side of the L-shaped long plate structure.

[0012] This invention discloses an L-shaped complex profile and its cold bending forming method, combining traditional roll bending and welding processes. By employing a roll bending followed by welding, it offers advantages in high efficiency and rapid forming. This method enables integrated forming of complex, asymmetrical L-shaped profiles while minimizing welding points, avoiding performance degradation in the welding area, ensuring dimensional accuracy, and significantly extending the service life of the L-shaped complex profile. The formed L-shaped complex profile exhibits significantly improved mechanical properties, achieving efficient and high-quality forming of L-shaped complex profiles. This method can be applied to various high-strength steels, making it widely applicable. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0014] Figure 1 This is a schematic diagram of the structure of the long plate and the short plate of the present invention.

[0015] Figure 2 This is a schematic diagram of the cold bending process of the L-shaped complex profile of the present invention. Figure 1 .

[0016] Figure 3 This is a schematic diagram of the cold bending process of the L-shaped complex profile of the present invention. Figure 2 .

[0017] Figure 4 This is a schematic diagram of the cold bending process of the L-shaped complex profile of the present invention. Figure 3 .

[0018] Figure 5 This is a schematic diagram of the multi-pass roll bending forming of long and short plates according to the present invention.

[0019] Figure 6 This is a flowchart of a cold bending forming method for an L-shaped complex profile according to the present invention.

[0020] Figure 7 This invention relates to a partial flowchart of the process of bending a long plate to create an L-shaped cross-section, thereby producing an L-shaped long plate structure.

[0021] Figure 8 This is another part of the flowchart of the present invention, which describes the process of bending a long plate to make its cross-section present an L-shaped structure, thus obtaining an L-shaped long plate structure.

[0022] Figure 9 This invention describes a process of bending a short plate to create an L-shaped cross-section, resulting in an L-shaped short plate structure.

[0023] Figure 10 This is a structural schematic diagram of the L-shaped complex profile of the present invention.

[0024] 101-Long plate, 102-Short plate, 103-L-shaped long plate structure, 104-L-shaped short plate structure, 105-Groove one, 106-Groove two. Specific implementation methods

[0025] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0026] Firstly, please refer to Figures 1-10 This invention provides a method for cold bending and forming L-shaped complex profiles, comprising: S1. Prepare a long board 101 and a short board 102 for use. In this embodiment of the invention, the thickness of the long plate 101 and the short plate 102 is 2~5mm.

[0027] S2 performs roll bending on the long plate 101 to make the cross section of the long plate 101 present an L-shaped structure, thus obtaining the L-shaped long plate structure 103. The specific steps include: S21 divides the long plate 101 into areas A, B, C, D, E, F, G, H, I, J, K, and L sequentially from one end to the other. S22 uses G area as web plate reference and performs multiple roll bending on F area. Each roll bending angle is a, and the roll bending angle a is less than the angle required for forming F area. In this step, the roller bending angle α is 15°, and the angle required for forming area F is 90°.

[0028] S23 uses F and G as webs in sequence, and rolls E and H respectively, with the roll bending angle being the angle required for forming. S24 uses E and H as webs in sequence, and rolls D and I respectively, with the roll bending angle being the angle required for forming. S25 uses area D as the web and rolls area C to bend it. The roll bending angle is smaller than the angle required for forming. S26 uses area B as the web and rolls area A to bend it. The roll bending angle is the angle required for forming. In this step, since the lengths of areas C, B, and A are too long and they are prone to interference with area F, it is preferable to use area B as the web and roll-bend area A in sequence, with the roll-bending angle being the angle required for forming. S27 uses area D as the web and rolls area C to bend it. The roll bending angle is the angle required for forming. S28 uses area C as the web and performs roll bending on area B, with the roll bending angle being the angle required for forming. S29 uses area I as the web and rolls the J area, with the roll bending angle being smaller than the angle required for forming. S210 uses the K region as the web and rolls the L region, with the roll bending angle being the angle required for forming. S211 uses area I as the web and rolls the J area, with the roll bending angle being the angle required for forming. S212 uses area J as the web and rolls the K area, with the roll bending angle being the angle required for forming. S213 welds the connection between area A and area L to obtain an L-shaped long plate structure 103.

[0029] S3 performs roll bending on the short plate 102 to make the cross section of the short plate 102 present an L-shaped structure, thus obtaining the L-shaped short plate structure 104. The specific steps include: S31 divides the short plate 102 into M region and N region sequentially from one end of the short plate 102 to the other end of the short plate 102; S32 uses the M region as the web reference and performs roll bending on the N region. The roll bending angle is the angle required for forming, thus producing an L-shaped short plate structure 104.

[0030] S4 performs welding on the L-shaped long plate structure 103 and the L-shaped short plate structure 104, so that the L-shaped long plate structure 103 and the L-shaped short plate structure 104 are welded together to obtain the L-shaped complex profile. The specific steps include: After the L-shaped long plate structure 103 and the L-shaped short plate structure 104 are joined together, the connection between the three areas M, D and C is welded, the connection between the four areas M, N, A and L is welded, and the connection between the three areas N, I and J is welded to obtain the L-shaped complex profile.

[0031] In this process, both the long plate 101 and the short plate 102 are formed in multiple passes during each roll bending process. Each roll bending process requires multiple passes and must be performed at a low speed to avoid irregular plastic deformation of the plate due to excessive speed, which could lead to uneven surfaces or wavy edges.

[0032] This invention provides a method for cold bending and forming L-shaped complex profiles, see [link to relevant documentation]. Figure 1 A long board 101 and a short board 102 are used; the long board 101 is segmented and marked, such as... Figures 2-4 As shown, the long plate 101 is divided into the following areas from left to right: A, B, C, D, E, F, G, H, I, J, K, and L. First, the long plate 101 is rolled to create a simple L-shaped cross-section. Using the middle area G as the web reference, area F is rolled multiple times, each time at a 15° angle and a 90° forming angle, for a total of 6 forming passes. The rolling forming process is described in reference [reference needed]. Figure 5 Then, using areas F and G as webs, roll bending is performed on areas E and H respectively, with the roll bending angle being the angle required for forming; continuing, using areas E and H as webs, roll bending is performed on areas D and I respectively, with the roll bending angle being the angle required for forming, and forming reference... Figures 2-4 At this point, because areas C, B, and A are too long and prone to interference with area F, it is prioritized to roll-bend area A sequentially using area B as the web, with the rolling angle being the angle required for forming. Then, area D is used as the web to roll-bend the sheet material after area C, with the rolling angle being the angle required for forming. This process is repeated, using area C as the web to roll-bend the sheet material after area B, with the rolling angle being the angle required for forming. Similarly, on the other side of the long sheet material 101, the end area L is rolled-bent, followed by the sheet material after areas J and K, with the rolling angle being the angle required for forming. The short sheet material 102 is segmented and marked, such as... Figures 2-4 As shown, the short plate 102 is divided into two sections from left to right: section M and section N. First, the short plate 102 is rolled to create a simple L-shaped cross-section. Using section M as the web reference, section N is rolled multiple times, each time at a 15° angle and a 90° forming angle, for a total of six forming passes. Welding is then performed at the connection between sections A and L to fix the L-shaped long plate structure 103. Next, welding is performed at the connection between sections M and N to fix the overall external structure of the L-shaped short plate structure 104. The resulting complex L-shaped profile has only three weld points. (See attached diagram.) Figure 4 , Figure 4 In the diagram, 1, 2, and 3 represent the first welding point, the second welding point, and the third welding point, respectively.

[0033] This invention combines traditional roll forming and welding processes, employing a roll-bending followed by welding approach, offering advantages such as high efficiency and rapid forming. This method enables integrated forming of complex, asymmetrical L-shaped profiles while minimizing welding points, avoiding performance degradation in the welding zone, ensuring dimensional accuracy, and significantly extending the service life of complex L-shaped profiles. The formed L-shaped profiles exhibit significantly improved mechanical properties, achieving efficient and high-quality forming of complex L-shaped profiles. This method can be applied to various high-strength steels, making it widely applicable.

[0034] Secondly, please refer to Figure 10 The present invention also provides an L-shaped complex profile, including an L-shaped long plate structure 103 and an L-shaped short plate structure 104; the side of the L-shaped long plate structure 103 has a first groove 105 and a second groove 106, the L-shaped short plate structure 104 is connected to the L-shaped long plate structure 103 and is located on the side of the L-shaped long plate structure 103.

[0035] The present invention discloses an L-shaped complex profile, wherein the L-shaped long plate structure 103 is formed by roll bending a long plate 101, and the L-shaped short plate structure 104 is formed by roll bending a short plate 102. The L-shaped long plate structure 103 and the L-shaped short plate structure 104 are connected together by welding. There are only 3 weld points between the L-shaped long plate structure 103 and the L-shaped short plate structure 104, which avoids the performance degradation defect in the welding area, ensures the accuracy of the cross-sectional dimensions, and greatly improves the service life of the L-shaped complex profile.

[0036] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A method of cold roll forming an L-shaped complex profile, characterized in that, The application relates to a cold bending forming method of an L-shaped complex profile. Preparation of a long plate and a short plate; The long plate is subjected to roll bending treatment, so that the cross section of the long plate presents an L-shaped structure, and an L-shaped long plate structure is prepared; The short plate is subjected to roll bending treatment, so that the cross section of the short plate presents an L-shaped structure, and an L-shaped short plate structure is prepared; The L-shaped long plate structure and the L-shaped short plate structure are subjected to welding treatment, so that the L-shaped long plate structure and the L-shaped short plate structure are welded together, and an L-shaped complex profile is prepared.

2. The L-shaped complex profile cold bending method according to claim 1, wherein The specific steps of the roll bending treatment of the long plate, so that the cross section of the long plate presents an L-shaped structure, and the L-shaped long plate structure is prepared, include the following steps. The long plate is sequentially divided into A, B, C, D, E, F, G, H, I, J, K and L zones from one end of the long plate to the other end of the long plate; The F zone is subjected to multiple roll bending with G zone as the web reference, and the roll bending angle is a, and the roll bending angle a is smaller than the angle required for the forming of the F zone; The E zone and the H zone are subjected to roll bending with the F zone and the G zone as the webs in sequence, and the roll bending angle is the angle required for the forming; The D zone and the I zone are subjected to roll bending with the E zone and the H zone as the webs in sequence, and the roll bending angle is the angle required for the forming; The C zone is subjected to roll bending with the D zone as the web, and the roll bending angle is smaller than the angle required for the forming; The A zone is subjected to roll bending with the B zone as the web, and the roll bending angle is the angle required for the forming; The C zone is subjected to roll bending with the D zone as the web, and the roll bending angle is the angle required for the forming; The B zone is subjected to roll bending with the C zone as the web, and the roll bending angle is the angle required for the forming; The J zone is subjected to roll bending with the I zone as the web, and the roll bending angle is smaller than the angle required for the forming; The L zone is subjected to roll bending with the K zone as the web, and the roll bending angle is the angle required for the forming; The J zone is subjected to roll bending with the I zone as the web, and the roll bending angle is the angle required for the forming; The K zone is subjected to roll bending with the J zone as the web, and the roll bending angle is the angle required for the forming; The connection between the A zone and the L zone is welded, and the L-shaped long plate structure is prepared.

3. The L-shaped complex profile cold bending method according to claim 2, wherein In the step of taking the G zone as the web reference and subjecting the F zone to multiple roll bending with the roll bending angle being a, and the roll bending angle a being smaller than the angle required for the forming of the F zone, The roll bending angle a is 15 DEG, and the angle required for the forming of the F zone is 90 DEG.

4. The L-shaped complex profile cold bending method according to claim 3, wherein The specific steps of the roll bending treatment of the short plate, so that the cross section of the short plate presents an L-shaped structure, and the L-shaped short plate structure is prepared, include the following steps. The short plate is sequentially divided into M and N zones from one end of the short plate to the other end of the short plate; The N zone is subjected to roll bending with the M zone as the web reference, and the roll bending angle is the angle required for the forming, and the L-shaped short plate structure is prepared.

5. The L-shaped complex profile cold bending method according to claim 4, wherein The specific steps of the welding treatment of the L-shaped long plate structure and the L-shaped short plate structure, so that the L-shaped long plate structure and the L-shaped short plate structure are welded together, and the L-shaped complex profile is prepared, include the following steps. The L-shaped long plate structure and the L-shaped short plate structure are butted, and the connection among the M zone, the D zone and the C zone is welded, the connection among the M zone, the N zone, the A zone and the L zone is welded, and the connection among the N zone, the I zone and the J zone is welded, and the L-shaped complex profile is prepared.

6. The cold bending forming method of the L-shaped complex profile according to claim 5, wherein The long plate and the short plate are each formed by multiple passes.

7. An L-shaped complex profile formed by the cold bending forming method of the L-shaped complex profile according to any one of claims 1 to 6, characterized in that, The L-shaped long plate structure has a side edge with a groove one and a groove two, and the L-shaped short plate structure is connected to the L-shaped long plate structure and located at the side edge of the L-shaped long plate structure.

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