Method for compensating springback of front cover outer panel and method for manufacturing front cover outer panel

Abstract

The embodiment of the application relates to the technical field of vehicles, and discloses a stamping springback compensation method of a front cover outer plate and a front cover outer plate manufacturing method. The stamping springback compensation method of the front cover outer plate comprises the following steps: obtaining a basic springback simulation result of the front cover outer plate; sequentially selecting a stamping reference position according to the basic springback simulation result; when the springback directions of two springback regions adjacent to the selected stamping reference position are the same, determining the selected stamping reference position as a compensation reference position; moving the compensation reference position by a preset distance towards the springback direction of the adjacent springback region and forming a modified reference position; and obtaining a modified springback simulation result of the front cover outer plate based on the stamping reference position without adjustment and the modified reference position. The application artificially reduces the springback amount in the springback simulation stage, reduces the compensation amount in the springback compensation stage, avoids the local springback distortion phenomenon caused by excessive compensation, and makes the surface of the front cover outer plate after stamping more smooth.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a method for compensating for the springback of a front hood outer panel during stamping and a method for manufacturing a front hood outer panel. Background Technology

[0002] With continuous improvements in manufacturing processes, people have increasingly higher demands for product quality. In the automotive manufacturing industry, the quality of a car is not simply a matter of appearance and performance; high precision is also required for the dimensions of various automotive components. This is especially true for exterior sheet metal parts, which are primarily formed through stamping. The dimensions of the formed sheet metal will experience varying degrees of springback, making dimensional control crucial. The forming force during stamping of exterior sheet metal parts typically reaches around 800 tons, and even for large side panels, it can reach 2000 tons. Sheet metal parts formed under high pressure usually have significant internal stress, which is generally released through springback. For parts with few distinctive features and relatively flat shapes, such as the front hood outer panel, the springback distance is typically greater than 5mm, and springback twisting often occurs, particularly in the windshield area of ​​the front hood outer panel.

[0003] Currently, to ensure the dimensions of the stamped front hood outer panel meet manufacturing requirements, springback analysis and compensation are performed during the stamping process design. However, the actual springback situation of the front hood outer panel is quite complex. While compensation based on the actual springback trend can meet tolerance requirements, defects in the appearance and performance of the part often remain. Springback distortion still occurs in the windshield area of ​​the front hood outer panel, resulting in a wavy surface. Therefore, existing stamping springback compensation methods struggle to meet appearance requirements. Summary of the Invention

[0004] In view of this, the present application provides a method for compensating for the springback of the front cover outer panel during stamping and a method for manufacturing the front cover outer panel, so as to solve the problem that the existing stamping springback compensation method is difficult to meet the appearance requirements.

[0005] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a method for compensating for the springback of a front hood outer panel during stamping, used in the stamping process of a vehicle's front hood outer panel. The front hood outer panel has stamping reference positions spaced apart on its periphery, with a springback zone formed between two adjacent stamping reference positions. The method for compensating for the springback of the front hood outer panel includes:

[0007] Obtain the basic springback simulation results of the front cover outer panel; select stamping reference positions sequentially based on the basic springback simulation results; when the springback directions of two adjacent springback areas of the selected stamping reference position are the same, determine the selected stamping reference position as the compensation reference position; move the compensation reference position a preset distance toward the springback direction of the adjacent springback area to form a correction reference position; based on the unadjusted stamping reference position and the correction reference position, obtain the corrected springback simulation results of the front cover outer panel.

[0008] The springback compensation method for the front cover outer panel provided in this application, after obtaining the basic springback simulation results, selects a location on the front cover outer panel that is prone to appearance defects, and uses the stamping reference position at this location as the compensation reference position. The compensation reference position is moved to form a correction reference position. When springback simulation is performed again based on this correction reference position and other unmoved stamping reference positions, the corrected springback simulation result obtained at this time is smoother than the basic springback simulation result. When springback compensation is continued based on the corrected springback simulation result, the compensated result will be closer to the actual state. By artificially reducing the springback amount during the springback simulation stage, the compensation amount during springback compensation is reduced, avoiding the local springback distortion phenomenon caused by overcompensation. This makes the surface of the front cover outer panel smoother after stamping, effectively solving the problem that the existing stamping springback compensation method cannot meet the appearance requirements.

[0009] In one possible implementation of this application, the step of sequentially selecting stamping reference positions based on the basic springback simulation results, and determining the selected stamping reference position as the compensation reference position when the springback directions of two adjacent springback zones of the selected stamping reference position are the same, includes:

[0010] Based on the basic springback simulation results, one of the stamping reference positions is selected. It is then determined whether the springback directions of the two adjacent springback zones of the selected stamping reference position are the same. If the springback directions of the two adjacent springback zones of the stamping reference position are the same, the simulated support force value at the selected stamping reference position is obtained and compared with the preset support force value. If the simulated support force value is greater than or equal to the preset support force value, the selected stamping reference position is used as the compensation reference position. If the simulated support force value is less than the preset support force value, the next stamping reference position is selected, and the steps of obtaining the simulated support force value at the selected stamping reference position and comparing it with the preset support force value when the springback directions of the two adjacent springback zones of the stamping reference position are the same are repeated.

[0011] Beneficial effects: By comparing the simulated support force value at the stamping reference position with the preset support force value, it is possible to more accurately determine whether the stamping reference position will cause springback distortion, ensuring that the simulation analysis results are closer to the actual state of the part, obtaining results that are more in line with production conditions, reducing invalid simulations, and improving design efficiency.

[0012] In one possible implementation of this application, the preset support force value is greater than or equal to 10N.

[0013] Beneficial effect: The required stamping reference position can be selected by comparing the preset support force value of this value.

[0014] In one possible implementation of this application, the preset distance is less than or equal to 1.5 mm.

[0015] Beneficial effects: Effectively limits the upper limit of the preset distance and can filter out stamping reference positions that cannot be effectively resolved.

[0016] In one possible implementation of this application, the preset distance is greater than or equal to 0.5 mm.

[0017] Beneficial effects: Effectively limits the lower limit of the preset distance, and can filter out stamping reference positions that do not need to be moved.

[0018] In one possible implementation of this application, after the step of obtaining the corrected springback simulation results of the front cover outer plate based on the unadjusted stamping reference position and the corrected reference position, the method further includes:

[0019] The springback compensation simulation results are obtained by performing springback compensation based on the corrected springback simulation results and the compensation reference position.

[0020] Beneficial effects: Since the corrected springback simulation results are more consistent with the actual springback of the parts, the springback compensation simulation results are also more reasonable and reliable.

[0021] In one possible implementation of this application, after the step of obtaining the springback compensation simulation result by performing springback compensation based on the corrected springback simulation result and the compensation reference position, the method further includes:

[0022] Compare the springback compensation simulation results with the preset simulation results, and change the value of the preset distance of the unqualified compensation reference position until the simulated springback compensation results meet the springback requirements.

[0023] Beneficial effect: By comparing the results of the springback compensation simulation, the accuracy of the simulation results is verified, ensuring that the results meet the springback requirements, thus effectively improving the reliability of the simulation results.

[0024] In one possible implementation of this application, the step of comparing the rebound compensation simulation result with the preset simulation result and changing the value of the preset distance of the unqualified compensation reference position until the simulated rebound compensation result meets the rebound requirement includes:

[0025] The actual tolerance value is obtained by comparing the springback compensation simulation result with the preset simulation result. The actual tolerance value is then compared with the preset tolerance value. If the actual tolerance value exceeds the preset tolerance value, the compensation distance is increased based on the preset distance and the simulation is performed again.

[0026] Beneficial effects: The comparison process is simple and quick, and this step can correct the position of the unqualified correction reference 104.

[0027] In one possible implementation of this application, the compensation distance ranges from 10% to 30% of the preset distance.

[0028] Beneficial effects: It can quickly correct the position of the reference point and can perform simulation again, improving design efficiency.

[0029] Secondly, embodiments of this application provide a method for manufacturing a front cover outer panel, which includes: the above-mentioned stamping springback compensation method for the front cover outer panel. Attached Figure Description

[0030] Figure 1 This is a flowchart of the stamping springback compensation method for the front cover outer panel according to an embodiment of the present invention;

[0031] Figure 2 This is a top view of the front cover outer panel in an embodiment of the present invention;

[0032] Figure 3 for Figure 2 The diagram shown is a local area of ​​the front hood outer panel after springback simulation without springback compensation when viewed from the front.

[0033] Figure 4 for Figure 2 The diagram shows a local area of ​​the front cover outer panel after conventional springback compensation and springback simulation.

[0034] Figure 5 for Figure 2 The diagram shows a local area of ​​the front cover outer panel after springback simulation using the springback compensation method in this embodiment of the invention.

[0035] Figure 6 The flowchart shows the additional steps in the stamping springback compensation method for the front cover outer panel of this invention.

[0036] Figure label:

[0037] 1. Front cover outer panel; 101. Stamping reference position; 102. Springback zone; 103. Compensation reference position; 104. Correction reference position. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0039] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0040] Furthermore, in the embodiments of this application, directional terms such as "upper," "lower," "left," and "right" are defined relative to the positions in which the components are schematically placed in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the position of the components in the accompanying drawings.

[0041] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can mean a fixed connection, a detachable connection, or an integral part; it can mean a direct connection or an indirect connection through an intermediate medium.

[0042] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0043] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0044] The following is combined Figures 1 to 6 The following describes embodiments of the present invention.

[0045] The springback compensation method for the front hood outer panel provided in this application embodiment is used in the stamping process of the front hood outer panel 1 of a vehicle. The front hood outer panel 1 has stamping reference positions 101 spaced apart on the periphery, and a springback area 102 is formed between two adjacent stamping reference positions 101. The springback compensation method for the front hood outer panel includes:

[0046] Obtain the basic springback simulation results of the front cover outer panel 1; select the stamping reference position 101 in sequence according to the basic springback simulation results; when the springback direction of the two adjacent springback areas 102 of the selected stamping reference position 101 is the same, determine the selected stamping reference position 101 as the compensation reference position 103; move the compensation reference position 103 towards the springback direction of the adjacent springback area 102 by a preset distance to form the correction reference position 104; based on the unadjusted stamping reference position 101 and the correction reference position 104, obtain the corrected springback simulation results of the front cover outer panel 1.

[0047] The stamping springback compensation method for the front cover outer panel of this embodiment, after obtaining the basic springback simulation results, selects the position on the front cover outer panel 1 that is prone to appearance defects, and uses the stamping reference position 101 at this position as the compensation reference position 103. The compensation reference position 103 is moved to form the correction reference position 104. When springback simulation is performed again according to the correction reference position 104 and other unmoved stamping reference positions 101, the obtained correction springback simulation result is smoother than the basic springback simulation result. When springback compensation is continued based on the correction springback simulation result, the compensated result will be closer to the actual state. By artificially reducing the springback amount during the springback simulation stage, the compensation amount during springback compensation is reduced, avoiding the local springback distortion phenomenon caused by overcompensation. This makes the surface of the front cover outer panel after stamping smoother, effectively solving the problem that the existing stamping springback compensation method cannot meet the appearance requirements.

[0048] It should be noted that, as Figure 2 As shown, the points around the perimeter of the outer front panel 1 are the stamping reference positions 101, and the area between two adjacent stamping reference positions 101 is the springback area 102 where springback is prone to occur. Springback is generally divided into positive springback and negative springback, among which, Figure 1 Outward is positive rebound, with Figure 2 Inwards is a negative rebound.

[0049] Specifically, with Figure 2 Taking the lower part of the observation window area of ​​the outer front panel 1 as an example, namely Figure 3As shown, there are three reference blocks below this area, each forming a stamping reference position 101. The stamping reference position 101 mainly supports the stamped part. Therefore, the springback of the stamped part at and near the stamping reference position 101 is usually small, approaching zero. However, due to the large interval between two adjacent stamping reference positions 101, a large negative springback will occur. Consequently, when springback simulation is performed without springback compensation, the following will occur: Figure 3 The larger wave shape shown.

[0050] In related technologies, such as Figure 4 As shown, due to the large supporting force of the stamping reference 101 located in the middle, the basic springback simulation results cannot reliably reflect the actual springback of the stamped parts when simulating springback based on this force trend of the stamping reference 101. Even after performing springback compensation directly on the basic springback simulation results using conventional springback compensation methods, although the local tolerance dimensions meet manufacturing requirements, springback will still occur in local areas, such as... Figure 4 The wavy surface shown in the figure still cannot meet the appearance requirements of existing products. When the stamping die obtained according to the method in the related technology is manufactured and put into use, it will be found that the appearance of the stamped part does not meet the requirements. At this time, it is necessary to remanufacture a new stamping die, which results in a lot of waste of manpower, material resources and time.

[0051] In this embodiment, by moving the position of the stamping reference 101 that meets the conditions in the basic springback simulation results, a corrected springback simulation result is obtained. This reduces the springback situation in the stamping reference 101 and its surrounding area where the support force is large. The corrected springback simulation result is closer to the actual springback state of the stamped part. Therefore, the surface of the part after springback compensation according to the corrected springback simulation result will be smoother, effectively avoiding the generation of a wavy surface. The stamping die manufactured using the stamping springback compensation method of the front cover outer plate in this embodiment is more accurate, which can avoid the situation where the stamping die is unqualified and needs to be remanufactured.

[0052] In this embodiment, the step of selecting stamping reference positions 101 sequentially based on the basic springback simulation results, and determining the selected stamping reference position 101 as the compensation reference position 103 when the springback directions of two adjacent springback zones 102 of the selected stamping reference position 101 are the same, includes:

[0053] Based on the basic springback simulation results, one of the stamping reference points 101 is selected. It is then determined whether the springback directions of the two adjacent springback zones 102 of the selected stamping reference point 101 are the same. If the springback directions of the two adjacent springback zones 102 of the stamping reference point 101 are the same, the simulated support force value at the selected stamping reference point 101 is obtained and compared with a preset support force value. If the simulated support force value is greater than or equal to the preset support force value, the selected stamping reference point 101 is used as a compensation reference point 103. If the simulated support force value is less than the preset support force value, the next stamping reference point is selected. The reference position 101 is then used again to obtain the simulated support force value at the selected stamping reference position 101 and compare it with the preset support force value when the springback directions of the two adjacent springback zones 102 of the stamping reference position 101 are the same. By comparing the simulated support force value at the stamping reference position 101 with the preset support force value, it is possible to more accurately determine whether the stamping reference position 101 will cause springback distortion, ensuring that the simulation analysis results are closer to the actual state of the part, obtaining results that are more in line with production conditions, reducing invalid simulations, and improving design efficiency.

[0054] It should be noted that, in some embodiments, as an alternative implementation, the comparison of simulated support force values ​​may not be performed. Instead, each stamping reference position 101 that meets the springback condition may be corrected and simulated to eliminate all possible twisting and deformation situations.

[0055] Specifically, by combining the dimensional data of the front cover outer panel 1 with CAE software simulation, the overall basic springback simulation results can be obtained. The support force values ​​at each stamping reference position 101 can be obtained by analyzing the CAE simulation software.

[0056] In this embodiment, the preset support force value is greater than or equal to 10N. Using this preset support force value, the required stamping reference position 101 can be selected by comparison.

[0057] It should be noted that since different parts have different specifications, dimensions and materials, the preset support force value can also be selected based on the corresponding empirical value, as long as the required stamping reference position 101 can be selected as the compensation reference position 103.

[0058] In this embodiment, the preset distance is less than or equal to 1.5mm, which effectively limits the upper limit of the preset distance and can filter out stamping reference positions 101 that cannot be effectively resolved.

[0059] Specifically, if the preset distance needs to exceed 1.5mm, it usually means that there is a problem with the rationality of the reference arrangement here, and the rigidity of the part needs to be re-analyzed and the reference arrangement needs to be made. This is not within the scope of the stamping springback compensation method for the front cover outer plate provided in the embodiments of the present invention.

[0060] In this embodiment, the preset distance is greater than or equal to 0.5mm, which effectively limits the lower limit of the preset distance and can filter out the stamping reference position 101 that does not need to be moved.

[0061] Specifically, if the preset distance needs to be less than 0.5mm, it usually means that the springback torsion phenomenon on both sides of the stamping reference position 101 is weak and no correction is needed, which can effectively avoid invalid simulation steps.

[0062] In this embodiment, after the step of obtaining the corrected springback simulation result of the front cover outer plate 1 based on the unadjusted stamping reference position 101 and the corrected reference position 104, the method further includes:

[0063] Based on the corrected springback simulation results and the compensation reference 103, springback compensation simulation results are obtained. Since the corrected springback simulation results are more consistent with the actual springback of the parts, the springback compensation simulation results are also more reasonable and reliable.

[0064] In this embodiment, after the step of obtaining the springback compensation simulation result by performing springback compensation based on the corrected springback simulation result and the compensation reference point 103, the method further includes:

[0065] The springback compensation simulation results are compared with the preset simulation results. The preset distance value of the unqualified compensation reference position 103 is changed until the springback compensation simulation results obtained meet the springback requirements. The correctness of the springback compensation simulation results is checked through the comparison steps to ensure that the results meet the springback requirements, thereby effectively improving the reliability of the simulation results.

[0066] In this embodiment, the step of comparing the rebound compensation simulation result with the preset simulation result and changing the value of the preset distance of the unqualified compensation reference position 103 until the simulated rebound compensation simulation result meets the rebound requirement includes:

[0067] The actual tolerance value is obtained by comparing the springback compensation simulation result with the preset simulation result. The actual tolerance value is then compared with the preset tolerance value. If the actual tolerance value exceeds the preset tolerance value, the compensation distance is increased based on the preset distance and the simulation is performed again. The comparison process is simple and quick. This step can correct the position of the unqualified correction reference 104.

[0068] In this embodiment, the compensation distance ranges from 10% to 30% of the preset distance, which can quickly correct the position of the reference position 104 and enable simulation again, thereby improving design efficiency.

[0069] According to an embodiment of the present invention, in another aspect, a method for manufacturing a front cover outer panel is provided, which includes: the above-described method for compensating for the springback of the front cover outer panel during stamping.

[0070] In this embodiment, the front cover outer panel manufacturing method also includes the necessary front cover outer panel design process and stamping process.

[0071] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

[0072] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made based on the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for compensating for springback during stamping of a front hood outer panel, used in the stamping process of a front hood outer panel (1) of a vehicle, wherein the front hood outer panel (1) has stamping reference positions (101) spaced apart at its periphery, and a springback zone (102) is formed between two adjacent stamping reference positions (101), characterized in that, include: Obtain the basic springback simulation results of the front cover outer panel (1); Based on the basic springback simulation results, the stamping reference position (101) is selected in sequence. When the springback direction of the two springback areas (102) adjacent to the selected stamping reference position (101) is the same, the selected stamping reference position (101) is determined as the compensation reference position (103). The compensation reference position (103) is moved a preset distance toward the rebound direction of the adjacent rebound area (102) to form a correction reference position (104). Based on the unadjusted stamping reference position (101) and the corrected reference position (104), the corrected springback simulation results of the front cover outer plate (1) are obtained; Following the step of obtaining the corrected springback simulation results of the front cover outer plate (1) based on the unadjusted stamping reference position (101) and the corrected reference position (104), the method further includes: Based on the corrected rebound simulation results and the compensation reference position (103), rebound compensation is performed to obtain the rebound compensation simulation results.

2. The method for compensating for springback during stamping of the outer front cover according to claim 1, characterized in that, The step of sequentially selecting the stamping reference position (101) based on the basic springback simulation results, and determining the selected stamping reference position (101) as the compensation reference position (103) when the springback directions of two adjacent springback areas (102) of the selected stamping reference position (101) are the same, includes: Based on the basic springback simulation results, one of the stamping reference positions (101) is selected, and it is determined whether the springback directions of the two adjacent springback areas (102) of the selected stamping reference position (101) are the same. When the springback directions of two adjacent springback zones (102) of the stamping reference position (101) are the same, the simulated support force value at the selected stamping reference position (101) is obtained and compared with the preset support force value. If the simulated support force value is greater than or equal to the preset support force value, then the selected stamping reference position (101) is used as the compensation reference position (103). If the simulated support force value is less than the preset support force value, then the next stamping reference position (101) is selected and the step of obtaining the simulated support force value at the selected stamping reference position (101) and comparing it with the preset support force value is performed again when the springback directions of the two adjacent springback areas (102) at the stamping reference position (101) are the same.

3. The method for compensating for springback during stamping of the outer front cover according to claim 2, characterized in that, The preset support force value is greater than or equal to 10N.

4. The method for compensating for springback during stamping of the outer front cover panel according to any one of claims 1 to 3, characterized in that, The preset distance is less than or equal to 1.5 mm.

5. The method for compensating for springback during stamping of the outer front cover panel according to any one of claims 1 to 3, characterized in that, The preset distance is greater than or equal to 0.5 mm.

6. The method for compensating for springback during stamping of the outer front cover panel according to any one of claims 1 to 3, characterized in that, After the step of obtaining the rebound compensation simulation result by performing rebound compensation based on the corrected rebound simulation result and the compensation reference position (103), the method further includes: The springback compensation simulation result is compared with the preset simulation result, and the value of the preset distance of the unqualified compensation reference position (103) is changed until the springback compensation simulation result obtained by simulation meets the springback requirement.

7. The method for compensating for springback during stamping of the outer front cover according to claim 6, characterized in that, The step of comparing the rebound compensation simulation result with the preset simulation result and changing the value of the preset distance of the unqualified compensation reference position (103) until the simulated rebound compensation simulation result meets the rebound requirement includes: The actual tolerance value is obtained by comparing the springback compensation simulation result with the preset simulation result, and then the actual tolerance value is compared with the preset tolerance value. If the actual tolerance value exceeds the preset tolerance value, a compensation distance is added based on the preset distance, and the simulation is performed again.

8. The method for compensating for springback during stamping of the outer front cover according to claim 7, characterized in that, The compensation distance is in the range of 10%-30% of the preset distance.

9. A method for manufacturing a front hood outer panel, characterized in that, include: The method for compensating for springback during stamping of the outer front cover panel according to any one of claims 1 to 8.

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