A stamping flanging die and method for controlling springback of a sheet metal

Abstract

A kind of stamping flanging die of controlling sheet springback, including lower die assembly installed on workbench, and the upper die assembly that can move to lower die assembly to complete stamping operation, the upper die assembly includes upper die holder, recessed die base is fixedly arranged on the upper die holder, flanging recessed die movablely arranged on the recessed die base can move along flanging direction;The lower die assembly includes lower die holder, the upper die holder is fixedly arranged with punch, and the lower die holder and punch are movably provided with material clamping punch movable along flanging direction;Between the material clamping punch and adjacent die components in flanging direction, there is provided with a fine adjustment gap, and a plurality of fine adjustment mechanisms with adjustable thickness are provided in the fine adjustment gap.By setting fine adjustment mechanism, the local, quantifiable adjustment of die working surface is realized, the different springback of different areas of parts due to material flow and uneven stress distribution can be compensated and corrected accurately, and the service life and debugging flexibility of the die are improved.

Description

Technical Field

[0001] This invention relates to the field of automotive parts processing technology, and in particular to a stamping and flanging die and method for controlling the springback of sheet metal. Background Technology

[0002] In stamping production in manufacturing industries such as automobiles and aerospace, the application of lightweight, high-strength sheet metal such as high-strength steel and aluminum alloys is becoming increasingly widespread. These materials exhibit a significant springback effect after forming, causing the final dimensions and shape of parts to deviate from the die cavity, severely impacting subsequent assembly accuracy and overall product quality. Therefore, effectively suppressing and compensating for springback in sheet metal forming, especially in the flanging process involving contour forming, has become a key technical challenge for improving the accuracy and stability of stamped parts.

[0003] Traditional flanging techniques typically employ a one-piece punch and die structure, but this method has the following limitations: 1. After simple flanging, the flange angle and contour of the part usually still have significant springback, often making it impossible to meet the design requirements in one step. To correct the springback, a separate shaping process must be added after the flanging process. This not only increases the additional mold cost but also prolongs the production cycle and reduces production efficiency.

[0004] 2. The punch of conventional flanging dies is mostly an integral rigid structure. This structure determines that the working surface of the die is an integral and cannot be adjusted. It is impossible to provide targeted compensation for the different springback caused by different material flow and stress states in different areas of the part (such as straight sections and rounded corners). As a result, the compensation effect is "one-size-fits-all" and it is difficult to meet the manufacturing requirements of high-precision and complex parts.

[0005] 3. During the mold debugging phase, mold repair for springback issues relies heavily on the technician's experience, employing a cycle of "trial molding - measurement - mold repair." Repair methods typically involve welding, grinding, and other mechanical processing of the mold body. This approach is time-consuming, inefficient, and lacks precision. More importantly, such operations can cause permanent, irreversible damage to the mold body, affecting its lifespan and making modifications difficult and costly. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a stamping flanging die and method for controlling sheet metal springback. This die has the ability to be locally adjustable and the pressure precisely controlled, thereby effectively suppressing and compensating for springback during flanging, improving the dimensional accuracy and stability of parts, and significantly shortening the die debugging cycle.

[0007] A stamping and flanging die for controlling sheet metal springback includes a lower die assembly mounted on a worktable and an upper die assembly movable toward the lower die assembly to complete a stamping operation. The upper die assembly includes an upper die base, on which a die base is fixedly disposed, and a flanging die movable along the flanging direction is movably disposed on the die base. The lower die assembly includes a lower die base, on which a punch is fixedly disposed, and a clamping punch movable along the flanging direction is movably disposed between the lower die base and the punch. A fine-tuning gap is provided between the clamping punch and an adjacent die component in the flanging direction, and a plurality of thickness-adjustable fine-tuning mechanisms are provided within the fine-tuning gap.

[0008] Furthermore, the flanging die is composed of multiple die inserts, which are installed on the profile of the die base and together form the working contour of the flanging die.

[0009] Furthermore, the fine-tuning mechanism includes a pad, and multiple pads are detachably disposed between the pad and adjacent mold components.

[0010] Furthermore, the gasket is a silicon steel sheet with a thickness of 0.05 mm.

[0011] Furthermore, for the flanged area of ​​the outer frame of the sheet metal, the fine-tuning mechanism is disposed between the clamping punch and the lower die base or the upper die base; for the flanged area of ​​the inner frame of the sheet metal, the fine-tuning mechanism is disposed between the clamping punch and the die insert.

[0012] A stamping and flanging method for controlling the springback of sheet metal, using the stamping and flanging die for controlling the springback of sheet metal, includes the following steps: S1. Based on the three-dimensional model of the target part, establish a CAE simulation model of the stamping and flanging die containing the control sheet springback, perform flanging and springback simulation analysis, and obtain the predicted profile of the part after springback. S2. Compare the predicted profile with the target profile, and calculate the springback deviation corresponding to different zones of the target part; S3. Based on the springback deviation, determine the amount of profile adjustment required to compensate the flanging die in the corresponding area; S4. Calculate the target thickness of the fine-tuning mechanism required at the corresponding position based on the surface adjustment amount; S5. Adjust the fine-tuning mechanism according to the target thickness to compensate for springback.

[0013] Further, step S3 specifically involves multiplying the springback deviation by a compensation coefficient greater than or equal to 1 to obtain the profile adjustment amount; wherein the direction of the profile adjustment amount is opposite to the direction of the springback deviation.

[0014] Further, step S4 specifically involves projecting the surface adjustment amount onto the adjustment direction of the fine-tuning mechanism to obtain the thickness change amount, and calculating the target thickness in combination with the initial thickness of the fine-tuning mechanism at that position.

[0015] Furthermore, it also includes step S6: updating the CAE simulation model with the adjusted mold parameters and re-performing the simulation analysis to verify the springback compensation effect; if the accuracy requirement is not met, the compensation coefficient is updated based on the new springback deviation, and the new springback deviation is used as the springback deviation, returning to step S3, until the springback deviation meets the preset tolerance.

[0016] Furthermore, the materials are grouped according to the stress state of the flanged area, and each group is assigned a compensation coefficient.

[0017] The stamping flanging die and method for controlling sheet metal springback provided by this invention achieves localized and quantifiable adjustment of the die's working surface by setting a fine-tuning gap with a fine-tuning mechanism between the clamping punch and adjacent die components. This structure allows the die to precisely compensate and correct for the differentiated springback caused by uneven material flow and stress distribution in different areas of the part during the flanging process. Compared to traditional integral, non-adjustable dies, this design avoids relying on subsequent separate forming processes or irreversible die repair operations such as welding and grinding of the die body. This significantly shortens the die debugging cycle, reduces damage to the die body, and improves the die's service life and debugging flexibility while improving part dimensional accuracy. Attached Figure Description

[0018] Figure 1 This is a perspective view of the upper die assembly in the stamping and flanging die for controlling sheet metal springback in the first embodiment of the present invention.

[0019] Figure 2 This is a perspective view of the lower die assembly in the stamping and flanging die for controlling sheet metal springback in the first embodiment of the present invention.

[0020] Figure 3 This is a cross-sectional view of the stamping and flanging die for controlling the springback of sheet metal in the first embodiment of the present invention.

[0021] Figure 4 This is a flowchart of a stamping and flanging method for controlling sheet metal springback in the second embodiment of the present invention.

[0022] The parts referred to by the numbers in the attached diagram are as follows: 1-Upper mold base; 2-Die base; 3-Die insert; 4-Lower mold base; 5-Punch; 601-First clamping punch; 602-Second clamping punch; 7-Fine adjustment mechanism; 71-Padded block; 72-Shim; 8-Nitrogen cylinder; 9-Ejector; 10-Conveying roller; 11-Positioning rod; 12-Lifting ring. Detailed Implementation

[0023] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0024] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0025] 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 invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] Example 1 Please see Figures 1 to 3 The first embodiment of the present invention provides a stamping and flanging die for controlling the springback of sheet metal, which mainly includes an upper die assembly and a lower die assembly. The lower die assembly is mounted on a worktable (not shown), and the upper die assembly is mounted on a slider of a press (not shown) and can move towards the lower die assembly under the action of the press to complete the stamping operation.

[0027] like Figure 1 As shown, the upper die assembly includes an upper die base 1, and a die base 2 is fixedly installed below the upper die base 1. The cavity shape of the die base 2 matches the external shape of the car door and is used to press the sheet metal body during the stamping operation. A die insert 3 is movably installed on the bottom edge of the die base 2, which can move independently along the flanging direction (usually perpendicular to the mold closing surface, or consistent with the normal direction of the local flanging contour). All die inserts 3 are precisely assembled according to the flanging contour of the car door to form a complete and continuous working surface of the flanging die.

[0028] like Figure 2As shown, the lower die assembly corresponds to the upper die assembly and includes a lower die base 4. A punch 5 is fixedly mounted on the lower die base 4, and its cavity shape matches the internal shape of the car door, used to support the sheet metal body during stamping operations. At the flanged end region of the punch 5, a clamping punch (also called a lower support core) that can move along the flanged direction is provided. Specifically, the clamping punch includes a first clamping punch 601 in an annular shape located between the lower die base 4 and the punch 5, used for flanged operation of the outer frame of the car door panel; it also includes a second clamping punch 602 surrounded by the punch 5, used for flanged operation of the inner frame of the car door panel (i.e., the window frame). Multiple nitrogen cylinders 8 are installed between the bottom of the clamping punch and the lower die base 4 to provide stable clamping force and reliable reset power.

[0029] like Figure 3 As shown, a fine-tuning gap is provided between the clamping punch and its adjacent die component in the flanging direction, and multiple fine-tuning mechanisms 7 are provided within the fine-tuning gap. Specifically, the fine-tuning mechanism 7 includes a pad 71 and a shim 72. The pad 71 is a standardized rectangular block with threaded holes, which is fastened to the die component (the top surface of the lower die base or the top surface of the clamping punch) by screws. Several shims 72 are detachably stacked between the pad 71 and the die component. The shims 72 are preferably 0.05mm thick silicon steel sheets, which have the characteristics of high precision, high rigidity and wear resistance. The shims 72 also have small holes for mounting with the pads. By increasing or decreasing the number of shims 72, the total thickness of the fine-tuning mechanism 7 can be adjusted in 0.05mm increments, thereby precisely controlling the size of the fine-tuning gap and adjusting the position of the relevant moving parts.

[0030] The installation position of the fine-tuning mechanism 7 varies depending on the different structures of the inner and outer frames of the car door parts. For the flanged area of ​​the inner frame (window frame) of the car door, since the inner frame is a closed ring with a compact space and the flanged area of ​​the inner frame of the car door is relatively light, the fine adjustment mechanism 7 is installed between the second clamping punch 602 and the corresponding die insert 3. Specifically, the pad 71 is fixed to the top of the second clamping punch 602 with screws, and during the flanged operation, the pad 71 directly contacts the bottom of the die insert 3.

[0031] For the flanged area of ​​the car door outer frame, since the outer frame has an open frame structure with ample space, and the flanged area of ​​the car door outer frame is heavy, if the flanged operation is performed on the concave die insert 3 through the downward fine-tuning mechanism 7 for a long time, the contact surface is small, which will cause significant damage to the concave die insert 3. Therefore, the fine-tuning mechanism 7 is installed between the first clamping punch 601 and the upper die base 1 or the lower die base 4. Specifically, a portion of the pads 71 ​​are fixedly installed on the top of the lower die base 4 and act on the bottom of the first clamping punch 601; another portion of the pads 71 ​​are fixedly installed on the top of the first clamping punch 601, surrounding the periphery of the flanged die, and act on the bottom of the upper die base 1. This connection to the main frame provides an extremely stable support foundation for the adjustment of the outer frame. It can achieve local compensation of the flanged area of ​​the outer frame by adjusting the thickness of a single fine-tuning mechanism 7, and the large-area setting ensures the overall balance and rigidity of the system.

[0032] Several ejectors 9 are fixedly installed on the lower die base 4. The ejectors act on the sheet metal through the openings on the punch 5. After the flanging operation is completed, the upper die opens, the ejectors 14 rise, and lift the door panel to prevent the sheet metal from adhering to the punch 5.

[0033] Two sets of conveying rollers 10 are installed on each of the two pairs of sides of the lower mold assembly along the feeding and discharging direction, forming a smooth roller track to facilitate material feeding in and out of the production line; the clamping punch is provided with multiple positioning rods 11, which correspond to the shape of the sheet metal edge to assist in sheet metal positioning. Multiple lifting rings 12 are also provided on the surface of each component of the upper and lower mold assemblies to facilitate the lifting and transportation of the mold.

[0034] The working process of the stamping flanging die for controlling the springback of sheet metal in conjunction with the door flanging process is as follows: Based on the CAE analysis results, the height of the fine-tuning mechanism 7 is adjusted by increasing or decreasing the number of shims 72. Then, the pre-formed door panel material is placed on the punch 5, and the press slide drives the upper die assembly downward. First, the flanging die, composed of multiple die inserts 3, contacts the edge of the door panel material and pushes it to bend around the contour of the punch 5, completing the basic flanging. At this time, the clamping punch, under the action of the nitrogen cylinder 8, has contacted the back of the sheet material. The press slide continues to descend to the end of its stroke. At this time, the flanging die presses the clamping punch, overcoming the force of the nitrogen cylinder 8 to make it descend, thereby applying a clamping force to the formed flanged flange. This clamping force can be decomposed into a frictional force along the surface of the sheet material and a pressure perpendicular to the surface of the sheet material, so that the material is stretched and flattened in a plastic state and undergoes slight deformation, effectively suppressing springback. Finally, the press slide returns. The flanging die first detaches from the sheet material and moves upward, and then the clamping punch, under the action of the nitrogen cylinder 8, resets and detaches from the sheet material. Finally, the ejector 14 of the lower mold moves to lift up the formed door part, ready to be taken away.

[0035] Throughout the process, the mold surface is given a compensation amount for the predicted springback through the pre-set, precisely calculated fine-tuning mechanism 7, so that the size and shape of the part can be as close as possible to the design target after natural springback.

[0036] Example 2 Please see Figure 4 In another aspect, the present invention also proposes a stamping flanging method for controlling the springback of sheet metal, comprising the following steps: S1. Based on the 3D model of the target part, establish a CAE simulation model of the stamping flanging die containing the control sheet springback, perform flanging and springback simulation analysis, and obtain the predicted profile S of the part after springback. sb .

[0037] Specifically, the CAE simulation model should include complete upper and lower die components, material properties of the sheet metal (such as stress-strain curves, especially for high-strength steel and aluminum alloys), and stamping process parameters (blank force, friction coefficient, and movement speed). Running this model, a flanging forming and subsequent springback simulation analysis is performed to obtain the three-dimensional predicted profile of the sheet metal in its final stable state after being subjected to the die action and undergoing free springback, denoted as S. sb .

[0038] S2, the predicted surface S sb With the target surface S target By comparing the results, the springback deviation δ corresponding to different zones of the target part is calculated; In this embodiment, based on the division of the die insert 3 in the actual mold, the part surface is divided into corresponding regions i1, i2, i3, ... . For each region i, S is calculated. sb With S target The deviation of the normal distance between them is the rebound deviation δ in this region. i δ i >0 indicates that the material expands outward after springback, meaning the compensation is insufficient; δ i <0 indicates inward contraction, meaning the compensation amount is too large.

[0039] S3. Based on the springback deviation δ, determine the surface adjustment amount ΔS required to compensate the flanging die in the corresponding area; Specifically, the profile adjustment amount ΔS satisfies the following relationship: ΔS i = -Kδ i .

[0040] In the formula, K is the compensation coefficient. This coefficient K is usually an empirical value, and K≥1. For materials with small springback and near-linear behavior, K can be taken as close to 1; for nonlinear materials with large springback, such as high-strength steel, over-compensation is often required, i.e., K>1. Based on actual test results, it is usually between 1.0 and 1.5, and its specific value can be determined based on historical process data or through subsequent iteration steps. The negative sign in the formula indicates that the adjustment direction is opposite to the springback deviation direction, that is, the mold shape needs to be adjusted in the opposite direction of springback to counteract the springback.

[0041] S4. Calculate the target thickness SC of the fine-tuning mechanism required at the corresponding position based on the surface adjustment amount ΔS.

[0042] In this embodiment, since the profile adjustment is achieved by changing the total thickness of the fine-tuning mechanism 7 to move the position of the die insert 3, it is necessary to adjust the vector ΔS. i Projecting along the adjustment direction of the fine-tuning mechanism 7, the required thickness change ΔT at that location is obtained. i Then, combining the initial assembly thickness T0 of the position fine-tuning mechanism 7 (in this embodiment, the thickness of the pad 71), the target thickness SC required to achieve the compensation effect is calculated. i The target thickness SC satisfies the following relationship: SC i = T0+ΔT i Furthermore, since the gasket 72 used is a standard piece with a minimum unit of 0.05mm, the calculated SC needs to be rounded to the closest gasket specification, and the number n of gaskets 72 to be installed needs to be output. The number n satisfies the following relationship: n i = round(SC i / 0.05) S5. Adjust the fine-tuning mechanism according to the target thickness to compensate for springback.

[0043] In this embodiment, based on the number n of shims at each position calculated in step S4, shims 72 from the fine-tuning mechanism 7 are installed on the physical mold, and the total thickness of the shims 71 and 72 is adjusted to the target value. This adjustment process can independently and precisely compensate for the differential area corresponding to each die insert 3, thereby achieving precise correction of the working surface of the mold.

[0044] S6. Update the CAE simulation model using the adjusted mold parameters and re-perform the simulation analysis to verify the springback compensation effect; if the accuracy requirement is not met, update the compensation coefficient based on the new springback deviation, and use the new springback deviation as the springback deviation, return to step S3, until the springback deviation meets the preset tolerance.

[0045] Specifically, the CAE simulation model is rerun using the adjusted mold parameters (i.e., the updated thickness of each fine-tuning mechanism) (step S1) to obtain a new springback prediction profile. Then, step S2 is repeated to calculate the new springback deviation δ'. If the new deviations in all areas are within the preset tolerance range (e.g., ±0.1 mm), the compensation is complete. If the requirements are not met, step S3 can be returned based on the new springback deviation data. In subsequent iterations, the previously used compensation coefficient K can be optimized, and a new round of calculations and adjustments can be performed using the new springback deviation as input until the accuracy requirements are met.

[0046] The specific iterative method for the compensation coefficient K is as follows: compare the rebound deviation obtained in step S2 with the new rebound deviation obtained in step S6. If the signs are the same, it is determined that the compensation is insufficient and the compensation coefficient is increased; if the signs are opposite, it is determined that the compensation is excessive and the compensation coefficient is decreased.

[0047] Specifically, for each partition i (or a group of partitions with similar overall rebound trends), the new rebound deviation δ i 'Evaluate the effectiveness of compensation:' If δ i 'and δ i The signs are the same, but the absolute value decreases, indicating that the direction of K is correct but its magnitude is insufficient. The previous compensation effect is used as an amplification factor to enhance the compensation strength of the next time. The updated formula is as follows:

[0048] For example, if the initial deviation is 0.4mm and K=1.2, and the deviation becomes 0.2mm after compensation, then the new K' = 1.4. However, to prevent overcompensation, an upper limit is usually set (such as K). max = 2).

[0049] If δ i 'and δ i An opposite sign indicates that the K value is too large, resulting in overcompensation. Therefore, the K value is reduced proportionally according to the degree of overcorrection, and the formula is updated as follows:

[0050] For example, initially deflected outward by 1 mm (i.e., δ) i = +1), K=1.5, after compensation it becomes an inward deviation of 0.3mm (i.e. δ i If K' = -0.3), then K' = 1.15.

[0051] If the deviation does not decrease significantly or increases, it indicates that the rebound nonlinearity in this region is extremely strong, or that the initial K value was chosen inappropriately. Therefore, it is necessary to revert to a conservative value, such as resetting K to 1.0, or manually probing with a smaller step size (such as 0.1). At the same time, it is necessary to check whether the mesh, contact, and other settings of the CAE model in this region are accurate.

[0052] Furthermore, since the material flow and stress state are different in different regions, the optimal K value may also be different. Regions with similar characteristics (such as straight flange sections and corner R-angle areas) can be grouped, and each group can be iterated using a K value to improve computational efficiency.

[0053] Through repeated iterations, data on "material-part type-optimal K value" for similar materials can be obtained. A database based on this data can be established, which can significantly reduce the number of iterations required for future calculations.

[0054] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A stamping and flanging die for controlling the springback of sheet metal, comprising a lower die assembly mounted on a worktable, and an upper die assembly movable toward the lower die assembly to complete a stamping operation, characterized in that: The upper mold assembly includes an upper mold base, on which a die base is fixedly disposed, and on which a flanging die that can move along the flanging direction is movably disposed; The lower die assembly includes a lower die base, on which a punch is fixedly mounted. A clamping punch that can move along the flanging direction is movably mounted between the lower die base and the punch. A fine-tuning gap is provided between the clamping punch and an adjacent die component in the flanging direction. Multiple thickness-adjustable fine-tuning mechanisms are provided within the fine-tuning gap.

2. The stamping and flanging die for controlling sheet metal springback according to claim 1, characterized in that: The flanging die is composed of multiple die inserts, which are installed on the surface of the die base and together form the working contour of the flanging die.

3. The stamping and flanging die for controlling sheet metal springback according to claim 1, characterized in that: The fine-tuning mechanism includes a pad, and multiple pads are detachably disposed between the pad and adjacent mold components.

4. The stamping and flanging die for controlling sheet metal springback according to claim 3, characterized in that: The gasket is a silicon steel sheet with a thickness of 0.05 mm.

5. The stamping and flanging die for controlling sheet metal springback according to claim 2, characterized in that: For the flanged area of ​​the outer frame of the sheet metal, the fine-tuning mechanism is located between the clamping punch and the lower die base or the upper die base; for the flanged area of ​​the inner frame of the sheet metal, the fine-tuning mechanism is located between the clamping punch and the die insert.

6. A stamping and flanging method for controlling the springback of sheet metal, characterized in that, Using a stamping flanging die for controlling sheet metal springback as described in any one of claims 1 to 5 includes the following steps: S1. Based on the three-dimensional model of the target part, establish a CAE simulation model of the stamping and flanging die containing the control sheet springback, perform flanging and springback simulation analysis, and obtain the predicted profile of the part after springback. S2. Compare the predicted profile with the target profile, and calculate the springback deviation corresponding to different zones of the target part; S3. Based on the springback deviation, determine the amount of profile adjustment required to compensate the flanging die in the corresponding area; S4. Calculate the target thickness of the fine-tuning mechanism required at the corresponding position based on the surface adjustment amount; S5. Adjust the fine-tuning mechanism according to the target thickness to compensate for springback.

7. The stamping and flanging method for controlling sheet metal springback according to claim 6, characterized in that: Step S3 specifically involves multiplying the springback deviation by a compensation coefficient greater than or equal to 1 to obtain the profile adjustment amount; wherein the direction of the profile adjustment amount is opposite to the direction of the springback deviation.

8. The stamping and flanging method for controlling sheet metal springback according to claim 6, characterized in that: Specifically, step S4 involves projecting the surface adjustment amount onto the adjustment direction of the fine-tuning mechanism to obtain the thickness change, and then calculating the target thickness in conjunction with the initial thickness of the fine-tuning mechanism at that position.

9. The stamping and flanging method for controlling sheet metal springback according to claim 7, characterized in that: It also includes step S6, updating the CAE simulation model with the adjusted mold parameters and re-performing the simulation analysis to verify the springback compensation effect; if the accuracy requirement is not met, the compensation coefficient is updated based on the new springback deviation, and the new springback deviation is used as the springback deviation, returning to step S3, until the springback deviation meets the preset tolerance.

10. The stamping and flanging method for controlling sheet metal springback according to claim 7, characterized in that: The materials are grouped according to the stress state of the flanged area, and each group is assigned a compensation coefficient.

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