Method for determining bending processing parameters of s-shaped longitudinal beam, s-shaped longitudinal beam and storage medium

Abstract

The embodiment of the application provides a kind of S-shaped longitudinal beam's bending processing parameter determination method, S-shaped longitudinal beam and storage medium, belong to automobile parts continuous die cold stamping technical field;Method comprises: obtaining the rebound nephogram data of target S-shaped longitudinal beam;According to rebound nephogram data, determine the distortion rebound area of target S-shaped longitudinal beam;Different local areas in the stress release simulation result obtained by stress release simulation of distortion rebound area are acquired, and the main stress area surface and the slave stress area surface are determined from the distortion rebound area according to the stress release simulation result;According to the first cross section distortion rebound error condition of pre-set, the main stress area surface and the slave stress area surface of longitudinal beam raw material are carried out pre-bending forming simulation optimization processing, and bending processing parameter is obtained.The embodiment of the application can consider product shape and distortion rebound demand at the same time, and improve the processing efficiency of S-shaped longitudinal beam based on flanging forming process.

Description

Technical Field

[0001] This application relates to the field of continuous die cold stamping technology for automotive parts, and in particular to a method for determining bending processing parameters of an S-shaped longitudinal beam, the S-shaped longitudinal beam, and a storage medium. Background Technology

[0002] S-shaped longitudinal beams (such as automotive longitudinal beams) are characterized by their long length, narrow width, and U-shaped cross-section. When produced using stamping processes, these beams are prone to torsional springback due to uneven stress, leading to deformation caused by opposite rotation along the longitudinal direction between the two ends. Current technology typically addresses this deformation by adding reinforcing ribs. However, in practical applications, these ribs are difficult to adapt to the flanging process while simultaneously meeting the requirements for product shape and torsional springback, and adding ribs reduces processing efficiency. Summary of the Invention

[0003] The main objective of this application is to propose a method for determining bending processing parameters of an S-shaped longitudinal beam, an S-shaped longitudinal beam, and a storage medium, which can improve the processing efficiency of S-shaped longitudinal beams obtained based on the flanging forming process while taking into account both product shape and torsional springback requirements.

[0004] To achieve the above objectives, a first aspect of this application proposes a method for determining bending processing parameters of an S-shaped longitudinal beam, the method comprising: Acquire springback cloud map data of the target S-shaped longitudinal beam, wherein the target S-shaped longitudinal beam is obtained by bending simulation of the longitudinal beam raw material according to a preset flanging forming process; Based on the springback cloud map data, the torsional springback area of ​​the target S-shaped longitudinal beam is determined; Obtain stress release simulation results by performing stress release simulations on different local areas of the tortuous and springback region, and determine the principal stress region surface and the secondary stress region surface from the tortuous and springback region based on the stress release simulation results; Based on the preset first section torsion and springback error condition, the principal stress region surface and the secondary stress region surface of the longitudinal beam raw material are subjected to pre-bending forming simulation optimization processing to obtain bending processing parameters.

[0005] To achieve the above objectives, a second aspect of this application provides an S-shaped longitudinal beam, comprising: The S-shaped longitudinal beam body is obtained by performing a first-station pre-forming process and a second-station shaping process based on preset bending processing parameters, wherein the bending processing parameters are obtained according to any of the methods described in the first aspect.

[0006] To achieve the above objectives, a third aspect of the present application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method for determining bending processing parameters of the S-shaped longitudinal beam as described in any of the first aspects.

[0007] The method for determining bending processing parameters of the S-shaped longitudinal beam, the S-shaped longitudinal beam, and the storage medium proposed in this application first determines the springback cloud map data of the target S-shaped longitudinal beam based on the flanging forming process simulation, thereby identifying the torsional springback region with uneven stress on the target S-shaped longitudinal beam. By performing local stress release simulation on the torsional springback region, the principal stress region surface and the secondary stress region surface that affect the torsional springback of the target S-shaped longitudinal beam are identified. Then, based on the first section torsional springback error condition during actual production, the principal stress region surface and the secondary stress region surface are optimized by pre-bending forming simulation, thereby obtaining the bending processing parameters that meet the first section torsional springback error condition. Therefore, this application embodiment identifies the key factors (i.e., the principal stress area) and secondary factors (i.e., the secondary stress area) that affect torsional springback, and performs pre-bending forming simulation optimization for these key and secondary factors. This eliminates the need to optimize every stress imbalance surface of the target S-shaped longitudinal beam, thereby improving processing efficiency without changing the appearance shape of the S-shaped longitudinal beam. Therefore, compared with related technologies, this application embodiment can improve the processing efficiency of S-shaped longitudinal beams obtained based on the flanging forming process while taking into account both product shape and torsional springback requirements. Attached Figure Description

[0008] Figure 1 This is a flowchart illustrating an embodiment of the method for determining bending processing parameters of the S-shaped longitudinal beam provided in this application; Figure 2 This is a schematic diagram illustrating the application process of the method for determining the bending processing parameters of the S-shaped longitudinal beam provided in this application; Figure 3 This is a flowchart illustrating the process of determining bending parameters based on pre-bending forming simulation optimization in the method for determining bending parameters of the S-shaped longitudinal beam provided in this application. Figure 4 This is a schematic diagram of an S-shaped longitudinal beam structure, illustrating an embodiment of the method for determining bending processing parameters of the S-shaped longitudinal beam provided in this application. Figure 5 It is formed based on a preset flanging forming process. Figure 4 A schematic diagram of the springback contour of the S-shaped longitudinal beam shown; Figure 6 Formed based on a pre-set flanging forming process Figure 4 The diagram shows the maximum cross-sectional torsion angle of the S-shaped longitudinal beam. Figure 7Formed based on a pre-set flanging forming process Figure 4 A schematic diagram of the stress region surface in the torsional springback zone of the S-shaped longitudinal beam shown; Figure 8 yes Figure 7 A schematic diagram of the springback contours after all stresses in the stress region have been released. Figure 9 The bending processing parameters of the S-shaped longitudinal beam provided in this application are determined based on the method for determining these parameters. Figure 4 A schematic diagram of the principal stress region and the secondary stress region of the S-shaped longitudinal beam shown. Figure 10 yes Figure 9 The diagram shows the springback contours after stress release from the principal stress region and the secondary stress region. Figure 11 The method for determining bending processing parameters of the S-shaped longitudinal beam provided in this application is specifically for... Figure 4 The diagram shows the operation of the shaping station in the simulation optimization process of pre-bending the S-shaped longitudinal beam. Figure 12 The bending parameters were obtained through simulation processing based on the bending processing parameter determination method for the S-shaped longitudinal beam provided in this application. Figure 4 A schematic diagram of the springback contour of the S-shaped longitudinal beam shown. Figure 13 The bending parameters were determined based on the bending parameter determination method for the S-shaped longitudinal beam provided in this application, and the results were obtained through simulation processing. Figure 4 A schematic diagram showing the maximum cross-sectional torsion angle of the S-shaped longitudinal beam shown. Figure 14 This is a schematic diagram of an S-shaped longitudinal beam structure, which is an application of the method for determining the bending processing parameters of the S-shaped longitudinal beam provided in this application. Figure 15 This is a schematic diagram of another embodiment of the S-shaped longitudinal beam, which is an application of the method for determining the bending processing parameters of the S-shaped longitudinal beam provided in this application. Figure 16 It is formed based on a preset flanging forming process. Figure 14 A schematic diagram of the springback contour of the S-shaped longitudinal beam shown; Figure 17 Formed based on a pre-set flanging forming process Figure 4 The diagram shows the maximum cross-sectional torsion angle of the S-shaped longitudinal beam. Figure 18 Formed based on a pre-set flanging forming process Figure 4 A schematic diagram of the stress region surface in the torsional springback zone of the S-shaped longitudinal beam shown; Figure 19 yes Figure 18A schematic diagram of the springback contours after all stresses in the stress region have been released. Figure 20 The bending processing parameters of the S-shaped longitudinal beam provided in this application were determined based on the method for determining these parameters. Figure 4 A schematic diagram of the principal stress region and the secondary stress region of the S-shaped longitudinal beam shown. Figure 21 yes Figure 20 The diagram shows the springback contours after stress release from the principal stress region and the secondary stress region. Figure 22 This is a schematic diagram of the extension direction of the pre-bending forming simulation optimization process in one embodiment of the method for determining the bending processing parameters of the S-shaped longitudinal beam provided in this application; Figure 23 The method for determining bending processing parameters of the S-shaped longitudinal beam provided in this application is specifically for... Figure 14 The diagram shows the operation of the shaping station in the simulation optimization process of pre-bending the S-shaped longitudinal beam. Figure 24 The bending parameters were determined based on the bending parameter determination method for the S-shaped longitudinal beam provided in this application, and the results were obtained through simulation processing. Figure 4 A schematic diagram of the springback contour of the S-shaped longitudinal beam shown. Figure 25 The bending parameters were determined based on the bending parameter determination method for the S-shaped longitudinal beam provided in this application, and the results were obtained through simulation processing. Figure 14 A schematic diagram showing the maximum cross-sectional torsion angle of the S-shaped longitudinal beam shown. Figure 26 This is a schematic diagram of the hardware structure corresponding to the method for determining the bending processing parameters of the S-shaped longitudinal beam provided in this application. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0010] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0011] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0012] The following is a definition of the technical terms used in the embodiments of this application: Torsion: is a phenomenon caused by an imbalance of residual stress on the cross-section of a part, which induces a pair of torques, causing one end of the part to twist relative to the other end about the same axis.

[0013] Stamped parts often exhibit uneven stress in localized areas due to factors such as the geometry of the stamped part, process-added surfaces, and process parameters. These stresses macroscopically manifest as torsional moments and bending moments, leading to twisting, curling springback, and opening springback, respectively. Inconsistent springback across different parts of the part can also cause twisting. For example, long, thin-walled parts have low torsional stiffness and are prone to torsional springback. For example, when the length dimension of a part is large, the amount of twist will be greater at the same twist angle; in this case, reducing the residual stress that generates the torsional moment can reduce the twisting deformation of the part. For example, unbalanced stress is more likely to occur in asymmetrical parts, parts with large flanges, parts with high sidewalls, and parts with uneven cross-sectional changes. For example, parts with inconsistent flange heights and asymmetrical trimming processes are also prone to twisting. In other words, for stamped parts, the amount of twist depends on the uneven stress distribution on the part and the stiffness of the sheet metal in the twisting direction. S-shaped longitudinal beams (such as automotive longitudinal beams) are characterized by their long length, narrow width, and U-shaped cross-section. Therefore, S-shaped longitudinal beams formed using stamping processes are more prone to torsional springback due to uneven stress distribution, leading to deformation caused by opposite rotation along the longitudinal direction between the two ends of the beam. In existing technologies, to address deformation caused by torsional springback in S-shaped longitudinal beams, drawing ribs can be used to control material flow, increase the plastic deformation area of ​​the sheet metal, and reduce the stress difference along the thickness direction, thus weakening springback and torsional phenomena. However, deep drawing increases the sheet metal area used, reduces material utilization, increases processing costs, and lowers processing efficiency. Furthermore, due to limitations in material utilization, for conventionally non-flanged U-shaped S-shaped longitudinal beams, the drawing process cannot be used to control torsional springback during the flanging process. Secondly, existing technologies can also mitigate deformation by adding reinforcing ribs at the rounded corner transitions, but this alters the product shape of the S-shaped longitudinal beam, failing to meet product requirements and resulting in low processing efficiency. Therefore, in practical applications, although stretch forming and reinforcing ribs can reduce torsional springback, it is difficult to simultaneously meet the product shape requirements and adapt to the flanging forming process while improving processing efficiency. Based on this, this application provides a method for determining bending processing parameters of an S-shaped longitudinal beam, an S-shaped longitudinal beam, and a storage medium, which can improve the processing efficiency of S-shaped longitudinal beams obtained based on the flanging forming process while taking into account both product shape and torsional springback requirements.

[0014] Understandably, referring to Figure 1 As shown, a method for determining bending processing parameters of an S-shaped longitudinal beam according to an embodiment of this application includes: Step S100: Obtain the springback cloud map data of the target S-shaped longitudinal beam, wherein the target S-shaped longitudinal beam is obtained by bending simulation of the longitudinal beam raw material according to the preset flanging forming process; Step S200: Determine the torsion and springback area of ​​the target S-shaped longitudinal beam based on the springback cloud map data; Step S300: Obtain the stress release simulation results obtained by performing stress release simulation on different local areas of the torsional springback region, and determine the principal stress region surface and the secondary stress region surface from the torsional springback region based on the stress release simulation results. Step S400: Based on the preset first section torsion and springback error conditions, perform pre-bending forming simulation optimization on the principal stress region surface and the secondary stress region surface of the longitudinal beam raw material to obtain bending processing parameters.

[0015] Therefore, by first simulating the springback cloud map data of the target S-shaped longitudinal beam based on the flanging forming process, the torsional springback region with stress imbalance on the target S-shaped longitudinal beam can be identified. By performing local stress release simulation on the torsional springback region, the principal stress region and secondary stress region affecting the torsional springback of the target S-shaped longitudinal beam are identified. Then, based on the first section torsional springback error condition during actual production, the principal stress region and secondary stress region are optimized through pre-bending forming simulation, thereby obtaining bending processing parameters that meet the first section torsional springback error condition. Therefore, this embodiment of the application identifies the key factors (i.e., principal stress region) and secondary factors (i.e., secondary stress region) affecting torsional springback, and performs pre-bending forming simulation optimization for these key and secondary factors. This eliminates the need to optimize every stress imbalance surface of the target S-shaped longitudinal beam, thereby improving processing efficiency without changing the appearance shape of the S-shaped longitudinal beam. Therefore, this embodiment of the application can simultaneously consider product shape requirements and torsional springback while improving the processing efficiency of S-shaped longitudinal beams obtained based on the flanging forming process.

[0016] In practical applications, due to the long length of the S-shaped longitudinal beam, it usually has multiple arc corners with uneven stress. By first screening out the principal stress area and the secondary stress area, and only performing pre-bending and forming simulation optimization on the principal stress area and the secondary stress area, it is not necessary to process and optimize every surface with uneven stress, thereby improving processing efficiency.

[0017] This application does not limit how to simulate the longitudinal beam raw material based on the flanging forming process. Those skilled in the art can perform simulation based on existing simulation methods. Therefore, this application will not elaborate on these points.

[0018] Springback cloud map data is used to indicate the magnitude and distribution of springback at various locations of the target S-shaped longitudinal beam after the longitudinal beam raw material is stamped / bent.

[0019] The torsion rebound area is used to indicate structural sections within a target S-shaped longitudinal beam where stress imbalances exist. For example, such as... Figure 5The springback contour map shown indicates that springback occurred in different directions at the straight and corner sections at both ends of the S-shaped longitudinal beam. Specifically, when the springback at the corner is the cause of the S-shaped longitudinal beam's bending, the corner section is considered a torsional springback region. By first identifying the torsional springback regions causing stress imbalances and then further refining the analysis of these regions, the analysis efficiency can be improved.

[0020] The stress relief simulation results in step S300 are used to indicate the magnitude and distribution of springback after the stress in different local areas is released.

[0021] This application embodiment does not limit how stress release simulation is performed in different local areas in step S300. In some embodiments, the surface of the torsional rebound area can be divided into local areas based on the change of stress direction to obtain local sub-regions with different stress directions. Then, stress release simulation is performed on each local sub-region and the combination of local sub-regions. In other embodiments, the local area segments that affect the torsion can be determined first, and then the main stress area surface and the secondary stress area surface can be determined by screening the curved surfaces with different stress directions on the local area segments.

[0022] In some embodiments, the principal stress region surface and the dependent stress region surface have the same bending direction. The number and size of local regions in the same bending direction are determined by the shape of the target S-shaped longitudinal beam.

[0023] The pre-bending simulation optimization process is used to simulate the pre-bending of the stress area surface corresponding to the longitudinal beam raw material according to a preset R angle, and to make the springback error of the stress area surface after pre-bending meet the first section torsion springback error condition.

[0024] Understandably, the torsional springback region includes at least one first flanged region surface and at least one second flanged region surface, with the stress directions generated on the first flanged region surface and the second flanged region surface being different; stress release simulation results are obtained by performing stress release simulations on different local areas of the torsional springback region, and the principal stress region surface and the secondary stress region surface are determined from the torsional springback region based on the stress release simulation results, including: Based on the simulation results of stress relief simulation on the surface of each first flange area, the first maximum cross-sectional torsion angle is determined; Based on the simulation results of stress relief simulation on the surface of each second flange region, the second maximum cross-sectional torsion angle is determined; Based on the first maximum cross-sectional torsion angle and the second maximum cross-sectional torsion angle, a target flanged area surface that meets the torsion degree condition is selected from the surface of the first flanged area and the surface of the second flanged area. Based on the simulation results of stress relief simulation of each flanged area surface combination, the third maximum cross-sectional torsion angle corresponding to each flanged area surface combination is determined; the flanged area surface combination is obtained based on each target flanged area surface combination. Based on the third maximum cross-sectional torsion angle, the principal stress region surface and the secondary stress region surface are determined from the surface of the target flanged area.

[0025] Different stress directions indicate different stress types. For example, if the stress type is tangential tension, the stress direction is outward; if the stress type is tangential compression, the stress direction is inward.

[0026] The first, second, and third maximum cross-sectional torsion angles are all used to indicate the maximum torsion angle on the end cross-section of the torsion rebound region after the target S-shaped longitudinal beam has undergone corresponding stress release simulation. For example, the first maximum cross-sectional torsion angle indicates the maximum torsion angle on the end cross-section of the torsion rebound region after the stress on the surface of each first flange region is released. Similarly, the second maximum cross-sectional torsion angle indicates the maximum cross-sectional torsion angle on the end cross-section of the torsion rebound region after the stress on the surface of each second flange region is released.

[0027] By using the first and second maximum cross-sectional torsion angles, the main source of stress causing stress imbalance can be quickly identified as the type of stress.

[0028] The torsion situation can be quantified more intuitively based on the first maximum cross-sectional torsion angle and the second maximum cross-sectional torsion angle.

[0029] Meeting the distortion condition indicates that the distortion did not worsen after stress release.

[0030] Stress relief simulation based on the surface combination of the flanged region can further determine the target flanged region surface that affects the torsion.

[0031] Understandably, based on the first maximum cross-sectional twist angle and the second maximum cross-sectional twist angle, a target flanged region surface that affects the degree of twist is selected from the first flanged region surface and the second flanged region surface, including: Obtain the threshold ratio of process factors; The threshold for distinguishing the degree of distortion is determined based on the initial maximum cross-sectional distortion angle of the distortion and springback region and the threshold ratio of process factors. The surface of the first flanged region corresponding to the first maximum cross-sectional torsion angle that is less than the torsion degree distinction threshold is taken as the target flanged region surface. The surface of the second flanged region corresponding to the second maximum cross-sectional twist angle that is less than the threshold for distinguishing the degree of twist is taken as the surface of the target flanged region.

[0032] The process factor threshold ratio represents the proportion of overall stress imbalance caused by process parameters. In some embodiments, the process factor threshold ratio is set to 0.75. This application does not limit the specific value of the process factor threshold ratio; those skilled in the art can selectively set it according to actual conditions.

[0033] Understandably, based on the torsion angle of each third maximum section, the principal stress region surface and the secondary stress region surface are determined from the surface of the target flange region, including: Based on the torsion angle of each third maximum section, the target flange area surface combination is determined from the surface combinations of each flange area; The surface of the flanged region corresponding to the maximum cross-sectional torsion angle with the smallest angle in the target flanged region surface combination is taken as the principal stress region surface, and the remaining flanged region surfaces in the flanged region surface combination are taken as the secondary stress region surfaces.

[0034] Each flanged area surface combination includes at least two flanged area surfaces.

[0035] In some embodiments, the surface combination of the flanged region corresponding to the third maximum cross-sectional twist angle that is less than the twist degree distinction threshold can be selected as the target flanged region surface combination.

[0036] There is at least one target flanged area surface combination; in some embodiments, when there are multiple target flanged area surface combinations, the flanged area surfaces in each target flanged area surface combination are sorted, and the flanged area surface with the smallest maximum cross-sectional torsion angle is taken as the principal stress area surface, and the flanged area surfaces other than the principal stress area surface are all taken as secondary stress area surfaces.

[0037] Understandably, based on the preset first section torsion springback error condition, the principal stress region and secondary stress region of the longitudinal beam raw material are pre-bending and forming simulation optimization processes are performed to obtain the bending processing parameters of the target S-shaped longitudinal beam, including: Obtain the extension length thresholds for the principal stress region surface and the secondary stress region surface, respectively; According to the preset first selection rule, the first candidate R-angle extension value that has not been selected and has the largest R-angle extension value is selected from the first R-angle extension value range; Based on the first candidate R-angle extension value and the extension length threshold from the stress region surface, the first station preforming process simulation processing is performed on the stress region surface to determine the second candidate R-angle extension value from the stress region surface when the first section torsion springback error condition is met. The second candidate R-angle extension value and the corresponding first candidate R-angle extension value are used as bending processing parameters.

[0038] In some embodiments, if a second candidate R-angle extension that satisfies the first section torsion springback error condition cannot be obtained based on the first candidate R-angle extension value, the process will jump to the step of selecting the first candidate R-angle extension value that has not been selected and has the largest R-angle extension value from the range of the first R-angle extension values ​​according to the preset first selection rule, and then reselecting the first candidate R-angle extension value.

[0039] The second candidate R-angle extension value is the longest R-angle extension value allowed to extend outward from the R-angle corresponding to the stress region surface when the first cross-section torsion springback error condition is met. In some embodiments, the R-angle extension value that satisfies the requirement of allowing the R-angle to extend outward from the stress region surface can be determined as the second candidate R-angle extension value by iterating through the R-angle extension values ​​allowed to extend outward from the stress region surface.

[0040] The second section torsion springback error condition indicates the maximum range of springback that can be generated in the principal stress region.

[0041] The first section's torsion springback error condition represents the allowable range of springback from the S-shaped longitudinal beam during the actual flanging process. The springback range corresponding to the second section's torsion springback error condition is greater than the springback range corresponding to the first section's torsion springback error condition.

[0042] Understandably, the threshold lengths of the principal stress region surface and the derived stress region surface are obtained separately, including: Structural parameters of the principal stress region surface and the secondary stress region surface are obtained separately. Each structural parameter includes the sidewall height and the radius (R) diameter. Determine the circumference of the semicircle that corresponds one-to-one with the diameter of each radius angle; The extension length threshold of the principal stress region surface is determined based on the difference between the sidewall height of the principal stress region surface and the circumference of the semicircle. The extension length threshold from the stress region surface is determined based on the difference between the sidewall height and the circumference of the semicircle.

[0043] The sidewall height indicates the height of the flange of the target S-shaped longitudinal beam.

[0044] The R-angle diameter represents the diameter of the circle containing the arc formed by bending the corresponding stress region surface into a preset R-angle.

[0045] Understandably, based on the extension length threshold of the principal stress region surface, the first preforming process simulation is performed on the principal stress region surface to determine the range of the first R-angle extension value of the principal stress region surface when the torsional springback error condition of the second section is met, including: According to the preset second selection rule, a third candidate R-angle extension value that is less than the extension length threshold is selected. Based on each third candidate R-angle extension value, the first station preforming process simulation is performed on the principal stress region surface to obtain the fourth maximum cross-sectional torsion angle corresponding to the third candidate R-angle extension value. When the trend of the twist angle change of the fourth maximum cross section does not meet the preset trend stability condition and does not meet the second cross section twist springback error condition, jump to the step of selecting the third candidate R angle extension value that is less than the extension length threshold according to the preset second selection rule and extension length threshold. The third candidate R-angle extension value when the trend of the twist angle change satisfies the preset trend stability condition and the second section twist springback error condition is taken as the target R-angle extension value. Based on the target R-angle extension value, determine the range of the first R-angle extension value of the principal stress region surface.

[0046] The second selection rule defines the step size for each selection and the current base R-angle extension value. In some embodiments, if the base R-angle extension value is 0 and the step size is 1, the value increases by 1 step from the base R-angle extension value until it is greater than or equal to the extension length threshold or the trend stabilization condition is met. In other embodiments, the base R-angle extension value is set as the extension length threshold, and the extension length threshold decreases by 1 step until the trend stabilization condition is met or the third candidate R-angle extension value is 1.

[0047] Understandably, based on the springback contour data, the torsional springback area of ​​the target S-shaped longitudinal beam is determined, including: Based on the rebound cloud map data, candidate rebound areas are determined in the target S-shaped longitudinal beam; the candidate rebound areas consist of candidate rebound sub-regions distributed along the longitudinal direction of the target S-shaped longitudinal beam. Stress relief simulation processing was performed sequentially on each candidate rebound sub-region to obtain the stress relief simulation processing results; Based on the stress relief simulation results, the tortuous rebound region is determined from each candidate rebound sub-region.

[0048] By segmenting the target S-shaped longitudinal beam to obtain each candidate rebound region, and determining the torsional rebound region based on each candidate rebound region, regions with uneven stress can be screened out.

[0049] For example, the bending processing parameter determination method of this application embodiments is described below with reference to three examples: Example 1: Method for determining bending processing parameters (refer to...) Figure 2 As shown, the specific steps are as follows: S1. Simulation is performed using a preset flanging forming process to determine the area that causes the twisting and springback of the target S-shaped longitudinal beam.

[0050] 1) By analyzing the springback cloud map data of the target S-shaped longitudinal beam, it is found that the target S-shaped longitudinal beam undergoes torsional deformation at the end of the candidate springback area; for example, the area segment in which the target S-shaped longitudinal beam has springback can be distinguished by different colors on the springback cloud map data, and this area segment is taken as the candidate springback area.

[0051] 2) The stress release module in Autoform software is used to release stress in different sections of the candidate springback area. For example, taking a candidate springback area that includes straight sections and corner sections as an example, when it is determined that the stress at the critical point of the straight section and the corner section changes sharply, the stress of the corner section and the straight edge section is released respectively. By comparing the springback results of the two stress releases, it can be concluded that after releasing the stress in the corner area, the part no longer twists. That is, the stress in the corner section is the main reason for the twisting of the beam during springback. The corner section is regarded as the twisting springback area. S2. Release stress in different local areas of the torsion and springback region, compare the maximum torsion angle of the torsion and springback region before and after stress release, and summarize the main and secondary factors causing the part's torsion. For example, the specific details are as follows: The surfaces with different stress directions at the R-angle of the torsion springback region are defined as outer curved flanges and inner curved flanges, respectively. Taking an example where each corner of the torsion springback region is composed of an outer curved flange, an inner curved flange, and a top plane, the in-plane stresses of the outer and inner curved flanges are released. Analysis of the springback results shows that releasing the stress on the inner curved flange region further exacerbates the twisting of the part, indicating a further imbalance of the overall moment on the part's surface. Analysis of the springback results shows that releasing the stress on the outer curved flange region significantly reduces the twisting of the part, confirming that the moment generated by the stress on the outer curved flange region causes the part to twist. Therefore, further releasing stress on the outer curved flange region is necessary to identify the primary and secondary factors affecting the part's twisting. The inner curved flange represents tangential tension and is an elongation deformation, with the greatest deformation at its edge, making it prone to cracking. The outer curved flange represents compressive deformation and is prone to instability and wrinkling. Its instability characteristics easily lead to a moment imbalance on the surfaces on both sides of the beam corner, resulting in part twisting.

[0052] S3. Perform simulation analysis on the longitudinal beam raw material to determine the principal stress region surface to be pre-bent and the outward extension distance from the bending radius (R-angle) of the stress region surface; for example, refer to... Figure 3 As shown, the outward extension distance of the principal stress region surface is... The distance extending outward from the stress region surface is Taking the second selection rule with a step of 1 as an example, the specific steps are as follows: S3.1, Order , ;in, This represents the shortest outward extension distance on the stress region surface of the S-shaped longitudinal beam obtained by stamping using the flanging forming process within a historical time period. Let X be the outward extension distance of the bending radius (R-angle) at the flanging point during pre-bending forming of the principal stress region surface in the sheet metal forming process. i Cross-section torsion springback angle θ and the range of error in the torsion rebound angle (- C , C ); S3.2, Pre-bending + Shaping: According to the set outward extension distance The forming simulation of the sheet metal was performed to obtain the maximum cross-sectional torsion angle of the formed part. θ .

[0053] S3.3, Judgment θ Does it fall into (-2)? C ,2 C If it is not within the range, adjust according to the preset selection rules. The size, and jump to S32, until θ The range falls within (-2) C ,2 C ); among them, such as Figure 3 As shown, when θ < -2 C This indicates that the part is severely twisted in the reverse direction, requiring a shorter outward extension distance to reduce the torque on the outer curved flange surface; at this time, ;when θ ＞ 2 C， This indicates that the distortion is still in its initial stage and requires further outward extension. 。 When the range of θ falls within (-2C, 2C), jump to S24; S3.4, Order , ;in, for θ The range falls within (-2) C ,2 C (when) The value of , This represents the shortest outward extension distance of the S-shaped longitudinal beam obtained by stamping using the flanging forming process within a historical time period on the surface of this stress region.

[0054] S3.5, Pre-bending + Shaping: According to the set outward extension distance , The forming simulation of the sheet metal was performed to obtain the maximum cross-sectional torsion angle of the formed part. θ .

[0055] S3.6, Judgment θDoes it fall into (-) C , C If it is not within the range, adjust the assignment according to the preset selection rules. The size of B is determined, and the process jumps to S25 until... θ The range falls within (- C , C ); among them, such as Figure 3 As shown, when θ < - C This indicates that the outward extension distance needs to be shortened. ;when θ>C, This indicates that the outward extension distance needs to be increased. 。 when The range that has been fully explored but still does not satisfy θ falls into (-C, C); adjust according to the preset selection rules. Then jump to S24; otherwise jump to S26; S3.7 Export processing data and ,at this time and The value is the outward extension distance of the bending R-angle at the outer curved flange of the current workpiece; S4. Extend the R-angle extension value corresponding to the bending R-angle outward from the surface of the principal stress region and from the surface of the stress region respectively (that is, extend outward respectively). , After that, the shaped sheet material is formed; S5. Reshape and press the outward-extending R-angle from step S4 back onto the sidewall.

[0056] S6. After the molding process is completed, the workpiece is removed from the mold and the product is inspected.

[0057] In some embodiments, if S23 and S25 determine 2 C < θ < θ 0 ( θ 0 represents the initial torsion springback angle, indicating that the workpiece is still in the initial torsion trend. At this point, the angle should be further increased. Value. If θ always satisfies θ > θ 0 indicates that the target S-shaped longitudinal beam is not suitable for adjustment of torsion and springback using preforming process.

[0058] Example 2: Taking the target S-shaped longitudinal beam as an example Figure 4 Taking the S-shaped longitudinal beam shown as an example, which is 1700mm long, has multiple perforations on its upper surface, and has a large size span, then... Figure 4As shown, the target S-shaped longitudinal beam, after being formed directly using the existing pre-set flange forming process, exhibits obvious asymmetrical bending in the length direction and a flangeless U-shaped cross-section, making it a typical S-shaped beam component. In this case, the method for determining the bending processing parameters based on the embodiments of this application is as follows: Assume the mechanical properties of the longitudinal beam material are as shown in Table 1 below: Table 1 Material mechanical property parameters

[0059] The steps are as follows: Step 1: Simulate using the flanging forming process to determine the torsional springback area that causes the target S-shaped longitudinal beam.

[0060] (1) The springback cloud data of the target S-shaped longitudinal beam material was simulated using the traditional flanging process. Figure 5 As shown. Among them, as Figure 5 As shown, in The cross-section at that location will undergo significant torsional deformation. The rebound amounts occur in different directions on the left and right sides, that is, at the corners and ends of the target's S-shaped longitudinal section. It is assumed that... The maximum springback torsion angle at the cross section is as follows Figure 6 As shown θ 0 = 2.3°. The maximum rebound torsion angle represents the angular offset relative to the desired target shape after the external force is released.

[0061] (2) The stress release module in Autoform software is used to release the stress in each local area of ​​the longitudinal beam corner. For example, Figure 7 As shown, Figure 4 The corner of the target S-shaped longitudinal beam shown is divided into stress region surface 1, stress region surface 2, stress region surface 3, and stress region surface 4. By clearing all stresses on stress region surfaces 1-4 to zero, the following can be obtained: Figure 7 The rebound contour plot shown. According to... Figure 8 As shown in the springback diagram, the degree of torsional deformation of the S-beam has been greatly reduced. Therefore, it can be concluded that the stress on both sides of the S-beam corner is the main cause of the springback torsion of the longitudinal beam. Thus, the area at the corner of the target S-shaped longitudinal beam is taken as the torsional springback area.

[0062] Step 2: Release the stress on the surface of each local area of ​​the torsional springback region of the target S-shaped longitudinal beam. At this time, with Figure 4 Taking the target S-shaped longitudinal beam structure shown as an example, the cross-section The maximum cross-sectional torsion angle at the location is shown in Table 2: Table 2 Maximum torsion angle of section S1 after stress relief

[0063] Wherein, as can be seen from the above Table 2, after releasing the in-plane stress of the outer-curvature flanging of the parts in regions 1 and 4, the cross-section twisting angle is less than 0.75 times the initial twisting angle, that is θ 1<0.75* θ 0=1.72°, θ 4<0.75* θ 0=1.72°. That is, Figure 9 the stress region surface 1 and stress region surface 4 shown therein are target flanging region surfaces; at this time, the pre-bending forming process is performed on these two stress region surfaces to change the in-plane stress state of their side walls, so as to actively control the twisting of the S-beam. At this time, as shown in Figure 10 , after simultaneously releasing the in-plane stress of the stress regions (1, 4), the springback amount corresponding to the twisted springback region in the springback nephogram of the target S-shape is significantly reduced. That is, the in-plane stress generated by outer-curvature flanging (compression deformation) is the main cause of springback twisting of the S-beam. At this time, the part has no obvious twisting springback. At this time, θ 1=0.92°, that is, the in-plane stress in region 1 plays a leading role; θ 4=1.33°, that is, the in-plane stress in region 4 is a secondary factor. Wherein, 0.75 represents the threshold proportion of process factors.

[0064] Step 3: Perform simulation analysis on the main stress region surface and the secondary stress region surface of the longitudinal beam raw material, determine the outward extension distance of the bending R angle at the main stress region surface and the outward extension distance of the bending R angle at the secondary stress region surface. For example, the specific steps are as follows: (1) During the sheet metal forming process, firstly, in the pre-forming process of the first station, the bending R angles of the stress region surface 1, which is the main factor affecting twisting of the S-beam, are extended outward respectively, and the workpiece is shaped in the second station, and the R angle pre-bent in the first process is shaped back to the side wall. For example, assume that the side wall height H of the stress region surface 1 is 55 mm, and the R angle diameter R is 15.5 mm. Then the R angle extension value satisfies X<H-πR / 2, obtaining X<30.7 mm. H-πR / 2 represents the extension length threshold; assuming that according to a preset second selection rule, the first candidate R angle extension values meeting the second cross-section twisting springback error condition can be 5 mm, 6 mm, 7 mm, 8 mm and 9 mm respectively. The maximum cross-section twisting angle corresponding to each first candidate R angle extension value θ is shown in Table 3 below: Table 3 Maximum twisting angle of S1 cross-section with different values of X1

[0065] It can be seen from Table 3 that when is greater than 6 mm, the cross-section twisting angle at S1 changes little and tends to be stable. Therefore, the outward extension distances of the bending R angles are respectively The value can be 6mm or less, meaning the first radius (R) extension value ranges from [5mm to 6mm]. Then, select the longest possible outward extension distance, i.e., within... Under the condition of 6mm, for Simulation analysis is performed on different values ​​of , assuming Maximum cross-sectional torsion angle when taking different values θ As shown in Table 4 below. When When the diameter is 5mm, the twist angle of section S1 is within the error range (-0.5°, 0.5°). As the angle increases, the torsion angle of section S1 becomes negative, meaning that beam S begins to twist in the opposite direction. This is also the second candidate R-angle extension value. The radius is 5mm; therefore, the outward extension distance of the bending radius is... and The optimal value is =6mm, When the diameter is 5mm, the maximum cross-sectional torsion angle of the S-beam is minimized. θ =0.12°, within the error range (-0.5°, 0.5°), =6mm, =5mm is output as the bending processing parameter.

[0066] Table 4 When = 6mm, Maximum torsion angle of section S1 with different values

[0067] At this point, as set, the bending radius (R-angle) of area 1 is extended outward by 6mm at the first station, and the bending radius (R-angle) of area 4 is extended outward by 5mm. (Refer to...) Figure 11 As shown, the workpiece is shaped at the second station, and the R-angle of the first pre-bent section is shaped back onto the side wall. The final springback result is as follows. Figure 12 As shown. At this time, according to Figure 12 As shown in the springback contour map, the overall torsional springback of the target S-shaped longitudinal beam is greatly improved after adopting the pre-bending forming process. The torsional springback angle of the S-beam section is as follows: Figure 13 As shown, the maximum cross-sectional torsion springback angle is 0.12°, which falls within the torsion springback angle error range (-0.5°, 0.5°).

[0068] Step 3: Export bending processing parameters. For example, assuming that the outward extension distance of the bending R angle applicable to the current S-beam outer curved flange areas 1 and 4 is determined according to the above steps, the parameters are as follows: =6mm, =5mm, that is, the outward extension distance is =6mm, When the diameter is 5mm, the torsion springback angle can be within the error range (-0.5°, 0.5°).

[0069] Step 4, according to =6mm, =5mm corresponds to the outward extension of the bending radius to form the sheet material.

[0070] Step 5: Reshape and press the outward-extending R-angle from step S3 back onto the side wall surface through a shaping process.

[0071] Step 6: After the molding process is completed, the workpiece is removed from the mold and the product is inspected.

[0072] Example 3: Taking the target S-shaped longitudinal beam as an example Figure 14 The figure shown is 2800mm long, 94mm wide at the left end, and 160mm wide at the right end. Figure 15 Taking an average height of 50mm as an example, the target S-shaped longitudinal beam exhibits obvious asymmetrical bending in the length direction and has a flangeless U-shaped cross-section, making it a typical slender S-shaped beam. The method for determining bending processing parameters based on this embodiment is as follows: Assuming the forming material used for the S-beam is high-strength steel with a plate thickness of 2.8mm, its mechanical properties are shown in Table 5 below: Table 5 Material mechanical properties parameters

[0073] The specific steps are as follows: Step 1: Simulate using the flanging forming process to determine the torsional springback area that causes the target S-shaped longitudinal beam.

[0074] (1) The target S-shaped longitudinal beam was simulated using the traditional flanging process, and the springback result cloud diagram is shown below. Figure 16 As shown. At this time, according to Figure 16 The rebound trend shown in the rebound cloud diagram indicates that the target S-shaped longitudinal beam underwent significant torsional deformation at the corner, with rebound amounts in different directions at the corner. Rebound amounts exist at both ends of the target S-shaped longitudinal beam. Assuming that one end of the beam intersects with the corner... The cross-sectional torsion angle at a given location is 2.6°, therefore the torsion springback region is determined as follows: (2) The stress relief module in Autoform software was used to stress the target S-shaped longitudinal beam, such as... Figure 18 The selected local areas, namely the corner areas corresponding to stress regions 1, 2, 3, 4, 5, and 6, are used for in-plane stress release, that is, to reduce the stress in these four local areas of the part to zero. At this point, we can obtain... Figure 19As can be seen from the springback contour map, the target S-shaped longitudinal beam did not exhibit significant torsional springback. This means that the stress on both sides of the corner of the target S-shaped longitudinal beam is the main cause of the beam's springback and torsion. Therefore, the entire corner segment is considered the torsional springback area.

[0075] Step 2: Release the stress on the surfaces of regions 1, 2, 3, 4, 5, and 6 (i.e., local areas) of the target S-shaped longitudinal beam. At this time, The maximum cross-sectional torsion angle is shown in Table 6: Table 6 Maximum torsion angle of section S1 after stress relief

[0076] As shown in Table 6, after releasing the in-plane stress of the outer curved flange of parts in regions 3 and 5, parts with a cross-sectional torsion angle less than 0.75 times the initial torsion angle showed no obvious torsional springback. θ 3<0.75* θ 0 = 1.95° θ 5<0.75* θ 0=1.95°. That is to say Figure 20 The stress region surfaces 3 and 5 shown are the target flanged areas. At this point, a pre-bending forming process is used for these two areas to change the in-plane stress state of their sidewalls, thereby actively controlling the twisting of the S-beam. Figure 21 The springback contour plot of the target S-shaped longitudinal beam after simultaneously releasing the in-plane stress in region (3,5). That is, the in-plane stress generated by the outward bending and flanging (compression-type deformation) is the main cause of the springback distortion of the target S-shaped longitudinal beam. At this time, θ 5 = 0.84°, and the in-plane stress in region 5 plays a dominant role; θ 3 = 1.31°, and the in-plane stress in region 3 is a minor factor.

[0077] Step 3: Conduct simulation analysis on the longitudinal beam raw materials corresponding to the main and secondary factors to determine the outward extension distance of the bending radius (R-angle) applicable to the 3rd and 5th regions of the current S-beam's outer curved flange. , When C = 0.5°, meaning the torsion springback angle of section S1 is within the error range of -0.5° to 0.5°, the torsion springback of the part meets the torsion springback error condition of the first section, as follows: (1) During the sheet metal forming process, the bending radius (R) of the S-beam in the first pre-forming stage is extended outwards in the area of ​​the main torsion factor 5. At this time, The direction of extension is as follows Figure 22 middle The arrow indicates the direction of extension, and in the direction shown by the arrow. Figure 23The second station as shown reshapes the workpiece, and reshapes the R-angle pre-bent in the first sequence back onto the side wall. Assume that the side wall height of the twisted factor 5 region H=23mm and R=7.2mm. Then <H-πR / 2, obtaining <11.7mm. In some embodiments, the are taken as 5mm, 6mm, 7mm, 8mm, 9mm, 10mm and 11mm respectively. Correspondingly, the maximum section twist angle after the completion of the second station process can be obtained respectively θ as shown in Table 7 below.

[0078] Table 7 Maximum twist angle of S1 section with different values of X5

[0079] It can be seen from Table 7 that when is greater than 9mm, the change of the section twist angle is not significant and tends to be stable. Therefore, the outward extension distances of the bending R angles are respectively can be 9mm first. At this time, the twist angle of the S-beam is 0.93°, and the section twist springback angle is within the error range (-1°, 1°).

[0080] (2) Under the condition that is taken as 9mm, simulation analysis is performed on different values of similarly. Assume that the side wall height of the region H=35mm. Then the maximum section twist angle can be obtained θ as shown in Table 8 below.

[0081] Table 8 Maximum twist angle of S1 section with different values of X3 when X5=9mm

[0082] As shown in Table 8, when =5mm~7mm, the section twist angle is within the error range (-0.5°, 0.5°), and as increases, the section twist angle becomes a negative value, that is, the S-beam starts to reverse torsion. Therefore, the outward extension distances of the bending R angles and the optimal values are =9mm, =5mm. At this time, the section twist angle of the S-beam θ=0.47°, which is within the error range (-0.5°, 0.5°).

[0083] (3) According to the setting, at the first station, the position of the bending R angle of the No. 5 region is referenced to Figure 23 in Extend outwards 9mm in the direction indicated by the arrow; refer to the position of the bend radius (R-angle) in area 3. Figure 23 middle The arrow indicates an outward extension distance of 5mm. At the second station, the workpiece is shaped, and the pre-bent R-angle from the first sequence is shaped back onto the side wall. The final springback result is as follows... Figure 24 As shown in the cloud diagram, it can be seen that the pre-bending forming process greatly improves the overall torsional springback of the S-beam. The torsional springback angle of the S-beam section is as follows: Figure 25 As shown, the cross-sectional torsion springback angle of 0.47° falls within the torsion springback angle error range (-0.5°, 0.5°). If it is not within this range, adjust... , The size, until θ The range is within (-0.5°, 0.5°).

[0084] Step 4: Export the processing data. =9mm =5, the value is the outward extension distance of the bending R angle at the outer curved flange of the current workpiece.

[0085] Step 5: Bend the R-angle according to... =9mm, 5mm outward extension of the formed sheet material; Step 6: Reshape the outward-extending R-angle from Step 5 back onto the side wall surface through a reshaping process.

[0086] Step 7: After the molding process is completed, the workpiece is removed from the mold and the product is inspected.

[0087] Therefore, the above embodiments of this application can actively adjust the in-plane stress state of the part at the process level through bending processing parameters, generating a reverse torque, thereby achieving a torque balance state and actively reducing the degree of part distortion. This, combined with the R-angle pre-treatment of the first-sequence pre-bending and the sidewall process of the second-sequence shaping and outer bending flange, reduces the amount of twisting springback in the S-shaped longitudinal beam, resulting in high forming accuracy and stable state of the S-shaped longitudinal beam, making it suitable for processing and forming ultra-high strength steel materials. Furthermore, the pre-bending forming process of this application's embodiments, using a two-station process, eliminates the need for pre-reserved drawing rib area in the sheet metal, improving material utilization and saving material costs. Moreover, since the embodiments of this application are directly determined through simulation, compared to traditional processes that require multiple mold modifications to control springback, significant manpower and material resources are saved.

[0088] It is understood that an S-shaped longitudinal beam provided according to an embodiment of this application includes: The S-shaped longitudinal beam body is obtained by processing the first pre-forming process and the second shaping process based on preset bending processing parameters. The bending processing parameters are obtained according to the bending processing parameter determination method mentioned above.

[0089] Understandably, an electronic device provided according to embodiments of this application includes: At least one processor; At least one memory for storing at least one program; The above method for determining bending processing parameters is implemented when at least one program is executed by at least one processor.

[0090] For example, please refer to Figure 7 , Figure 7 The hardware structure of an electronic device according to another embodiment is illustrated. The electronic device includes: The processor 501 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this application. The memory 502 can be a NAND flash, and the relevant program code is stored in the memory 502 and called by the processor 501 to execute the bending processing parameter determination method of the S-shaped longitudinal beam of this application embodiment; The input / output interface 503 is used to implement information input and output; The communication interface 504 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.). Bus 505 transmits information between various components of the device (e.g., processor 501, memory 502, input / output interface 503, and communication interface 504); The processor 501, memory 502, input / output interface 503, and communication interface 504 are connected to each other within the device via bus 505.

[0091] This application embodiment also provides a computer-readable storage medium, which stores a computer program that, when executed by a processor, implements the above-described method for determining the bending processing parameters of the S-shaped longitudinal beam.

[0092] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0093] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0094] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0095] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0096] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0097] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0098] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0099] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0100] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0101] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0102] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes multiple instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0103] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A method for determining bending processing parameters of an S-shaped longitudinal beam, characterized in that, The method includes: Acquire springback cloud map data of the target S-shaped longitudinal beam, wherein the target S-shaped longitudinal beam is obtained by bending simulation of the longitudinal beam raw material according to a preset flanging forming process; Based on the springback cloud map data, the torsional springback area of ​​the target S-shaped longitudinal beam is determined; Obtain stress release simulation results by performing stress release simulations on different local areas of the tortuous and springback region, and determine the principal stress region surface and the secondary stress region surface from the tortuous and springback region based on the stress release simulation results; Based on the preset first section torsion and springback error condition, the principal stress region surface and the secondary stress region surface of the longitudinal beam raw material are subjected to pre-bending forming simulation optimization processing to obtain bending processing parameters.

2. The method for determining the bending processing parameters of the S-shaped longitudinal beam according to claim 1, characterized in that, The torsion rebound region includes at least one first flanged region surface and a second flanged region surface that corresponds one-to-one with the first flanged region surface. The stress directions generated by the first flanged region surface and the second flanged region surface are different. The step of obtaining stress relief simulation results from stress relief simulations of different local regions of the tortuous and springback region, and determining the principal stress region surface and the secondary stress region surface from the tortuous and springback region based on the stress relief simulation results, includes: Based on the simulation results of stress relief simulation on the surface of each of the first flanged areas, the first maximum cross-sectional torsion angle is determined; Based on the simulation results of stress relief simulation on the surface of each of the second flanged regions, the second maximum cross-sectional torsion angle is determined; Based on the first maximum cross-sectional torsion angle and the second maximum cross-sectional torsion angle, a target flanged area surface that meets the torsion degree condition is selected from the first flanged area surface and the second flanged area surface; Based on the simulation results of stress relief simulation of each flanged area surface combination, the third maximum cross-sectional torsion angle corresponding to each flanged area surface combination is determined; the flanged area surface combination is obtained based on each target flanged area surface combination. Based on the third maximum cross-sectional torsion angle, the principal stress region surface and the secondary stress region surface are determined from the surface of the target flanged region.

3. The method for determining the bending processing parameters of the S-shaped longitudinal beam according to claim 2, characterized in that, The step of selecting a target flanged region surface that affects the degree of twisting from the surfaces of the first flanged region and the second flanged region based on the first maximum cross-sectional twist angle and the second maximum cross-sectional twist angle includes: Obtain the threshold ratio of process factors; The threshold for distinguishing the degree of distortion is determined based on the initial maximum cross-sectional distortion angle of the distortion and springback region and the threshold ratio of the process factors. The surface of the first flanged region corresponding to the first maximum cross-sectional twist angle that is less than the twist degree differentiation threshold is taken as the target flanged region surface; The surface of the second flanged region corresponding to the second maximum cross-sectional twist angle that is less than the twist degree differentiation threshold is taken as the target flanged region surface.

4. The method for determining the bending processing parameters of the S-shaped longitudinal beam according to claim 2, characterized in that, The step of determining the principal stress region surface and the secondary stress region surface from the surface of the target flanged area based on the third maximum cross-sectional torsion angle includes: Based on the third maximum cross-sectional torsion angle of each of the aforementioned, the target flange area surface combination is determined from each of the flange area surface combinations; The surface of the flanged region corresponding to the maximum cross-sectional torsion angle with the smallest angle in the target flanged region surface combination is taken as the principal stress region surface, and the remaining flanged region surfaces in the flanged region surface combination are taken as the secondary stress region surfaces.

5. The method for determining the bending processing parameters of the S-shaped longitudinal beam according to claim 1, characterized in that, The pre-bending forming simulation optimization process is performed on the principal stress region and secondary stress region of the longitudinal beam raw material according to the preset first section torsion springback error condition to obtain the bending processing parameters of the target S-shaped longitudinal beam, including: The extension length thresholds of the principal stress region surface and the secondary stress region surface are obtained respectively; Based on the extension length threshold of the principal stress region surface, the first station preforming process simulation processing is performed on the principal stress region surface to determine the range of the first R angle extension value of the principal stress region surface when the second section torsion springback error condition is met. According to the preset first selection rule, the first candidate R-angle extension value that has not been selected and has the largest R-angle extension value is selected from the first R-angle extension value range; Based on the first candidate R-angle extension value and the extension length threshold of the stress region surface, the stress region surface is subjected to a first-stage preforming process simulation to determine the second candidate R-angle extension value of the stress region surface when the first cross-section torsion springback error condition is met. The second candidate R-angle extension value and the corresponding first candidate R-angle extension value are used as the bending processing parameters.

6. The method for determining the bending processing parameters of the S-shaped longitudinal beam according to claim 5, characterized in that, The step of obtaining the extension length thresholds of the principal stress region surface and the secondary stress region surface respectively includes: The structural parameters of the principal stress region surface and the secondary stress region surface are obtained respectively, and each structural parameter includes the sidewall height and the radius (R) diameter; Determine the circumference of the semicircle that corresponds one-to-one with the diameter of each of the aforementioned R-angles; The extension length threshold of the principal stress region surface is determined based on the difference between the sidewall height of the principal stress region surface and the circumference of the semicircular arc. The extension length threshold of the stress region surface is determined based on the difference between the sidewall height of the stress region surface and the circumference of the semicircular arc.

7. The method for determining the bending processing parameters of the S-shaped longitudinal beam according to claim 5, characterized in that, The step of performing a first-stage preforming process simulation on the principal stress region surface based on the extension length threshold of the principal stress region surface to determine the range of the first R-angle extension value of the principal stress region surface when satisfying the second section torsion springback error condition includes: According to the preset second selection rule, a third candidate R-angle extension value that is less than the extension length threshold is selected; Based on each of the third candidate R-angle extension values, the first station preforming process simulation is performed on the principal stress region surface to obtain the fourth maximum cross-sectional torsion angle corresponding to each of the third candidate R-angle extension values. When the trend of the twist angle change of the fourth maximum cross-section does not meet the preset trend stability condition and does not meet the second cross-section twist springback error condition, the process jumps to the step of selecting a third candidate R angle extension value that is less than the extension length threshold according to the preset second selection rule and the extension length threshold. The third candidate R-angle extension value when the trend of the twist angle change satisfies the preset trend stability condition and the second section twist springback error condition is taken as the target R-angle extension value. Based on the target R-angle extension value, determine the range of the first R-angle extension value of the principal stress region surface.

8. The method for determining the bending processing parameters of the S-shaped longitudinal beam according to claim 5, characterized in that, Based on the springback cloud map data, the torsional springback region of the target S-shaped longitudinal beam is determined, including: Based on the rebound cloud map data, candidate rebound regions in the target S-shaped longitudinal beam are determined; the candidate rebound regions are composed of candidate rebound sub-regions distributed along the longitudinal direction of the target S-shaped longitudinal beam. Stress relief simulation processing was performed sequentially on each candidate rebound sub-region to obtain the stress relief simulation processing results; Based on the stress relief simulation results, the tortuous rebound region is determined from each of the candidate rebound sub-regions.

9. An S-shaped longitudinal beam, characterized in that, include: The S-shaped longitudinal beam body is obtained by performing a first-stage preforming process and a second-stage shaping process based on preset bending processing parameters, wherein the bending processing parameters are obtained according to the method described in any one of claims 1 to 8.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for determining the bending processing parameters of the S-shaped longitudinal beam as described in any one of claims 1 to 8.

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