Press forming analysis method, press forming analysis device, and press forming analysis program

Abstract

The stamping analysis method of the present application includes: performing stamping analysis using a flat blank model (3), obtaining the shape of the stamping product after demolding as a first shape (5) in a first shape obtaining step (S1); generating a shape-changing blank model (7) in a generating step (S3); performing stamping analysis using the shape-changing blank model (7), obtaining the shape of the stamping product after demolding as a second shape (9) in a second shape obtaining step (S5); comparing the first shape (5) and the second shape (9), and obtaining the deviated part and the deviation amount of the two shapes in a deviation amount obtaining step (S7).

Description

Technical Field

[0001] This invention relates to a press forming analysis method, an apparatus, and a press forming analysis program for predicting the influence of shape variation of a blank obtained from a metal sheet with shape variation during press forming. Background Technology

[0002] Due to increasingly stringent collision safety standards for automobiles, improvements in automotive body collision safety are hampered by current CO2 emission restrictions. Furthermore, to enhance fuel efficiency, automotive body weight reduction is necessary. To balance collision safety performance and lightweight construction, automotive bodies are increasingly using higher-strength metal panels compared to previous methods.

[0003] In the past, the actual metal sheet used to obtain the blank for stamping was not perfectly flat and had a wave-like shape (shape variation). Therefore, the actual blank obtained from the metal sheet was not necessarily flat and had shape variations.

[0004] When a metal sheet with such a wave shape is used as a blank and stamped into an automotive part, the resulting stamped part may exceed the target dimensional accuracy due to the influence of its shape variation.

[0005] Regarding stamped products after stamping, as a technique for screening stamped products that exceed the target dimensional accuracy, patent documents 1 and 2 have been disclosed, for example.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 62-047504

[0009] Patent Document 2: Japanese Patent Application Publication No. 2019-002834 Summary of the Invention

[0010] The technical problem that the invention aims to solve

[0011] The techniques disclosed in Patent Document 1 or Patent Document 2 compare the shapes of the pressed parts with each other, but cannot predict the influence of changes in the shape of the blank before pressing on the pressed parts. Previously, the influence of changes in the shape of the blank on the shape of the pressed parts was not predicted, and it was not determined which part of the pressed parts was most susceptible to changes in the shape of the blank.

[0012] The present invention was made to solve the above problems, and its object is to provide a stamping analysis method, a stamping analysis apparatus, and a stamping analysis program for predicting the influence of shape deformation of a blank obtained from a metal sheet with shape deformation during stamping.

[0013] Technical solutions for solving technical problems

[0014] The stamping analysis method of the present invention predicts the influence of shape changes of a blank obtained from a metal sheet with shape changes during stamping. It includes: a first shape acquisition step, in which a flat blank model with a flat shape is used to perform stamping analysis when stamping with a prescribed tool of pressforming model, and the shape of the stamped product after die release is obtained as a first shape; a generation step, in which a shape-change blank model corresponding to the shape change is generated; a second shape acquisition step, in which the shape-change blank model is used to perform stamping analysis when stamping with the prescribed tool of pressforming model, and the shape of the stamped product after die release is obtained as a second shape; and a deviation amount acquisition step, in which the first shape and the second shape are compared to determine the deviation location and deviation amount of shape change between the two shapes.

[0015] Alternatively, the shape-variable billet model generated in the generation step may be a billet model with a cyclic wave shape, wherein the cyclic wave shape has a specified pitch and a specified amplitude.

[0016] Alternatively, the shape-variant billet model generated in the generation step may be a billet model generated based on the measurement results of the actual billet obtained from the metal plate with shape variation.

[0017] Alternatively, the deviation amount acquisition step may involve obtaining the difference between the springback amount of a specified portion in the first shape and the springback amount of the same portion in the second shape as the specified portion in the first shape, as the deviation amount.

[0018] It may further include a determination step, in which the portion where the deviation exceeds a preset threshold is determined as the portion requiring countermeasures.

[0019] The stamping analysis apparatus of the present invention predicts the influence of shape variation of a blank obtained from a metal sheet with shape variation during stamping. It comprises: a first shape acquisition unit that performs stamping analysis using a flat blank model with a flat shape and a predetermined mold model to obtain a first shape of the stamped product after demolding; a generation unit that generates a shape-variable blank model corresponding to the shape variation; a second shape acquisition unit that performs stamping analysis using the shape-variable blank model and the predetermined mold model to obtain a second shape of the stamped product after demolding; and a deviation amount acquisition unit that compares the first shape and the second shape to determine the deviation location and deviation amount between the two shapes.

[0020] Alternatively, the shape-changing billet model generated in the generating section may be a billet model with a periodic wave shape, wherein the periodic wave shape has a specified spacing and a specified amplitude.

[0021] It is possible that the shape-variable billet model generated in the generation section is a billet model generated based on the measured value of the shape of the actual billet obtained from the metal plate with shape variation.

[0022] Alternatively, the deviation amount acquisition unit may acquire the difference between the rebound amount of a predetermined portion in the first shape and the rebound amount of the same portion in the second shape as the predetermined portion in the first shape as the deviation amount.

[0023] It may further include a determining unit that determines the part where the deviation exceeds a preset threshold as the part where countermeasures need to be taken.

[0024] The stamping analysis program of the present invention enables a computer to function as the stamping analysis device of the present invention.

[0025] Invention Effects

[0026] According to the present invention, it is possible to identify the parts of the blank where shape variations significantly affect the shape of the stamped article after springback, and the amount of deviation caused by the shape variations of the blank. Furthermore, the quality of the stamped article can be determined based on the deviation amount and a predetermined threshold, thereby predicting the quality of the blank. Thus, it is possible to grasp the limit of the blank's shape accuracy that converges to the required shape accuracy of the stamped article, and by selecting a blank with an appropriate shape, stable stamping with good shape can be performed. In addition, when shape variations occur in the stamped article, it is possible to determine which part of the blank before stamping is the cause of the shape variation, and to take appropriate countermeasures as early as possible, which is beneficial to improving productivity. Attached Figure Description

[0027] Figure 1 This is an explanatory diagram of each step of the stamping forming analysis method in Implementation Method 1.

[0028] Figure 2 This is an appearance view of the component that is the object in Implementation Method 1.

[0029] Figure 3 This is an explanatory diagram of the flat billet model used in Embodiment 1.

[0030] Figure 4 This is an illustration of the first shape used in stamping analysis with a flat blank model.

[0031] Figure 5 It is an illustration (1) of a shape-changing blank model with an uneven shape.

[0032] Figure 6 It is an explanatory diagram (2) of a shape-changing blank model with concave and convex shapes.

[0033] Figure 7 This is an illustration of the second shape used in stamping analysis with a shape-changing blank model.

[0034] Figure 8 It is a diagram that makes the second shape correspond to the shape-changing billet model.

[0035] Figure 9 This is an explanatory diagram of the stamping analysis apparatus of Embodiment 2.

[0036] Figure 10These are explanatory diagrams of a first shape (a) analyzed using a flat blank model and a second shape (b) analyzed using a shape-variable blank model in the embodiments.

[0037] Figure 11 This is a diagram showing the second shape in the embodiment corresponding to the shape-changing blank model. Detailed Implementation

[0038] [Implementation Method 1]

[0039] The stamping analysis method of this embodiment is a stamping analysis method that predicts the influence of blank shape deformation when using blanks obtained from metal sheets with shape variations (undulations) for stamping (crash forming, deep drawing, etc.). For example... Figure 1 As shown, the stamping analysis method of this embodiment includes: a first shape acquisition step S1, which is a shape acquisition step of standard press-formed part; a generation step S3, which is a generation step of shape variation blank model; a second shape acquisition step S5, which is a shape acquisition step of press-formed part using shape variation blank; and a deviation acquisition step S7. Hereinafter, we will... Figure 2 Taking the stamped product 1 shown as an example of stamping to the target shape, each component will be explained in detail. In this embodiment, a blank model of a 1.5GPa-class steel sheet with a sheet thickness of 1.2mm was used, but it is not limited to this.

[0040] <Steps for obtaining the first shape>

[0041] The first shape acquisition step S1 is to use... Figure 3 The process involves performing a stamping analysis on a flat blank model (hereinafter referred to as "flat blank model 3") with a specified mold model, and obtaining the shape of the stamped product after demolding as the first shape.

[0042] Flat blank model 3 is a blank model that is generally used in stamping analysis. It is a flat shape without concavity or convexity.

[0043] Stamping forming analysis typically employs CAE analysis methods such as the finite element method (FEM). Forming based on CAE analysis can be either plastic forming or deep drawing; however, this embodiment will use deep drawing as an example, while later embodiments will use plastic forming as an example.

[0044] Figure 4 This represents the first shape 5 after demolding, based on stamping analysis. Figure 4 In addition to shape, the amount of shape change from the bottom dead center is also represented by the shade of color. This change is calculated by subtracting the height of the corresponding part of the bottom dead center from the height of each part of the stamped part after demolding and springback in the stamping direction. That is, when the height difference (change) is positive, the shape becomes convex compared to the bottom dead center shape; when the height difference (change) is negative, the shape becomes concave compared to the bottom dead center shape. Figure 4 In the diagram, compared to the bottom stop of the molding process, the color of the concave areas is lighter, and the color of the convex areas is darker. Additionally, in the figures shown, "+" indicates the change in the convex direction, and "-" indicates the change in the concave direction, all in mm. In this example, as... Figure 4 As shown, the variation at the left end of the first shape 5 is 4.4 mm, the left end of the stretch flange portion is -0.6 mm, the center portion is 3.7 mm, the right side stretch flange portion is 1.8 mm, and the right end portion is -1.8 mm.

[0045] <Generation Steps>

[0046] Step S3 generates a shape-variant billet model 7 (refer to) that corresponds to the shape variation of the billet, such as a concave-convex wave shape. Figure 5 The steps are as follows. Figure 5 The example shown is a billet model with a periodic wave shape, the periodic wave shape having a specified spacing and a specified amplitude. Figure 5 The varying shades and textures within the image are rendered using [this technique]. Based on [this principle]... Figure 6 Describe the specific shape.

[0047] Observe from arrow A-A Figure 6The state of the cross section shown by the dashed line in (a) is Figure 6 (b) is a magnified view of its part. Figure 6 (c) Figure 5 , Figure 6 The example shown has a plate thickness of 1.2 mm, a convex-concave shape with an amplitude of ±2.5 mm, and a convex-concave spacing (refer to...). Figure 6 (d) is a 320mm shape. Additionally, the start and end positions of the raised and recessed areas set on the blank do not need to be the blank edge. Figure 6 (e) Emphasis Figure 6 (a) refers to the concave and convex parts of the shape.

[0048] The shape-variable blank model 7 generated in step S3 can also be generated by measuring the shape of the actual blank obtained from a specified position of the metal plate with shape variation using, for example, a 3D shape measuring instrument based on a laser rangefinder, and generating the blank based on the measurement results.

[0049] <Second Shape Acquisition Steps>

[0050] Step S5, which is to use the shape-changing blank model 7 to perform stamping analysis when stamping with a specified mold model, and obtain the shape of the stamped product after demolding as the second shape. Figure 7 This represents the second shape, 9. Figure 7 The colors and values ​​shown are the same as those shown. Figure 4 same.

[0051] like Figure 7 As shown, the variation at the left end of the second shape 9 is 5.3 mm, the left end of the stretching flange is -1.3 mm, the central part is 3.5 mm, the right side of the stretching flange is 1.7-1.9 mm, and the right end is -1.4 mm, which is consistent with the case where the billet is flat. Figure 4 Compared to stamped parts, the left and right ends of stamped parts and the left end of the drawn flange have a larger variation from the bottom stop of forming.

[0052] <Steps for obtaining deviation>

[0053] Step S7, which involves comparing the first shape 5 and the second shape 9, is the step of determining the deviation location and deviation amount of the two shapes.

[0054] In this embodiment, the shape of the stamped part at the bottom stop of forming is taken as the standard shape. The amount of change (springback) between each part of the stamped part and the standard shape, obtained through CAE analysis, is calculated. The amount of change is compared with the change when the blank is changed, and the difference in the amount of change caused by the change of the blank is taken as the deviation. That is, the deviation is the amount of change from the second shape 9 using a blank with shape variation ( Figure 7 Subtract the change in shape 5 using a flat blank. Figure 4 The value obtained is as follows: When the difference (deviation) of the change is + (positive), this part of the second shape 9 becomes a convex shape compared to the first shape 5, and when the difference (deviation) of the change is - (negative), this part of the second shape 9 becomes a concave shape compared to the first shape 5.

[0055] The deviation calculated in the case of deep drawing corresponds to the shape-variable blank model 7 with concave and convex shapes, and is shown in Figure 8 .like Figure 8 As shown, the deviation at the left end of the second shape 9 is the largest, at 0.9 mm, indicating a significant influence from the convex shape at the left end of the shape-changing blank model 7 before stamping. Furthermore, the deviation at the left end of the second shape 9, which becomes the stretch flange, is -0.7 mm, significantly becoming a concave shape, indicating a significant influence from the concave shape in the shape-changing blank model 7 corresponding to this part. In the figure, Max represents the maximum value of the convex shape, and Min represents the maximum value (minimum value) of the concave shape. This is evident in... Figure 11 The same applies to China.

[0056] Regarding the second shape 9 for determining the deviation amount, it can also be expanded into a blank through reverse pressing-forming analysis to determine the parts of the blank model 7 that affect the shape change of the deviation amount.

[0057] According to this embodiment, the influence of blank shape variation on the shape of the stamped part after springback can be determined, i.e., the areas with significant influence and the deviation caused by shape variation. Furthermore, the quality of the stamped part can be judged based on the deviation and a predetermined threshold, thereby predicting the quality of the blank. For example, when multiple stamped parts are overlapped and joined to assemble components for a car body, the joining of the stamped parts becomes difficult, especially when the deviation of the flange portion is large. Therefore, by setting a predetermined threshold for the deviation, the shape variation of the blank for stamped parts with deviations exceeding the threshold has a significant impact. By determining that the blank is unusable, the quality of the blank can be predicted. Thus, the limit of the blank's shape accuracy, which converges to the required shape accuracy of the stamped part, can be grasped. By selecting a blank with an appropriate shape, stable stamping with good shape can be performed. Furthermore, in the case of shape defects in stamped parts, it is possible to determine which part of the blank before stamping is the cause of the shape defect, and take appropriate countermeasures as early as possible, which is beneficial to improving productivity.

[0058] Furthermore, it includes a step to identify portions requiring countermeasures (the determination step) that identifies portions where the maximum deviation exceeds a preset threshold as portions requiring countermeasures. This allows for the identification of portions where countermeasures based on the shape of the mold, etc., are to be taken when using blanks with shape variations. For example, in... Figure 8 If the threshold for the deviation of the second shape 9 is set to ±0.5mm, then it is only necessary to correct the left end of the second shape 9 and the left end of the stretching flange to converge within the threshold. Countermeasures such as correcting part of the mold of this part can be taken.

[0059] As a deviation calculated based on the difference in blank shape, it can also be used to calculate the difference between the height of each part of the stamped product shape after demolding and springback when the blank has irregularities and the height of each part of the stamped product shape after demolding and springback when the blank is flat. However, in order to compare the shapes of different stamped products based on blanks, it is necessary to set a common fixed point for each stamped product. Depending on the method of selecting the fixed point, there may be cases where the differences between the parts of the stamped product are different. In this regard, preferably as in the above embodiment, the deviation can be accurately and easily calculated by comparing the changes in shape with the lower stop point.

[0060] [Implementation Method 2]

[0061] The stamping analysis method described in Embodiment 1 can be implemented by executing a pre-set program on a computer such as a PC (personal computer). In this embodiment, a stamping analysis apparatus will be described as an example of such an apparatus. Figure 9 As shown, the stamping analysis apparatus 11 of this embodiment is composed of a computer such as a PC (personal computer), and includes a display device 13, an input device 15, a memory storage device 17, a working data memory 19, and an arithmetic processing unit 21. Furthermore, the display device 13, the input device 15, the memory storage device 17, and the working data memory 19 are connected to the arithmetic processing unit 21, and each performs its respective function according to instructions from the arithmetic processing unit 21. Hereinafter, ... Figure 2 The stamped product 1 shown is the object of analysis, and the constituent elements of the stamping analysis apparatus of this embodiment will be explained.

[0062] Display Devices

[0063] The display device 13 is used for displaying analysis results, etc., and consists of an LCD monitor, etc.

[0064] Input Device

[0065] The input device 15 is used for displaying and indicating blanks, press forming parts, etc., and for inputting operator conditions, and consists of a keyboard, mouse, etc.

[0066] Storage Devices

[0067] The storage device 17 is used for storing various files such as shape files 31 of blanks and stamped products, and is composed of a hard disk or the like.

[0068] Data Storage for Job Operations

[0069] The operational data storage 19 is used for the temporary storage and processing of data used in the arithmetic processing unit 21, and is composed of RAM (Random Access Memory) and the like.

[0070] Computational Processing Department

[0071] like Figure 9As shown, the arithmetic processing unit 21 includes a first shape acquisition unit 23, which is a shape acquisition unit of standard press-formed part; a generation unit 25, which is a generation unit of shape variation blank model; a second shape acquisition unit 27, which is a shape acquisition unit of press-formed part using shape variation blank; and a deviation acquisition unit 29, all of which are composed of a CPU (central processing unit) such as a PC. Furthermore, it may further include a part determination unit (determination unit) for which countermeasures need to be taken. These units function by the CPU executing a prescribed program. The functions of the aforementioned units in the arithmetic processing unit 21 will be explained below.

[0072] The first shape acquisition unit 23 performs the first shape acquisition step S1 as described in Embodiment 1. Similarly, the generation unit 25 performs the generation step S3, the second shape acquisition unit 27 performs the second shape acquisition step S5, the deviation amount acquisition unit 29 performs the deviation amount acquisition step S7, and the determination unit performs the determination step.

[0073] According to the stamping analysis apparatus 11 of this embodiment, the influence of shape changes in the blank on the shape of the stamped product after springback can be obtained in the same manner as in Embodiment 1, namely, the areas with large influence and the deviation caused by shape changes. Furthermore, the quality of the stamped product is determined based on the deviation and a predetermined threshold, thereby predicting the quality of the blank. Moreover, by providing a countermeasure determination unit that identifies areas where the deviation exceeds a predetermined threshold as areas requiring countermeasures, it is possible to determine the areas where countermeasures based on the shape of the die and countermeasures based on changes in the shape of the stamped product should be taken when using a blank with shape changes.

[0074] As described above, the first shape acquisition unit 23, generation unit 25, second shape acquisition unit 27, deviation acquisition unit 29, and determination unit in the stamping analysis apparatus 11 of this embodiment are implemented by a CPU executing a predetermined program. Therefore, the stamping analysis program of the present invention can determine that the computer functions as the first shape acquisition unit 23, generation unit 25, second shape acquisition unit 27, deviation acquisition unit 29, and determination unit.

[0075] Example

[0076] To confirm the effectiveness of the present invention, a stamping analysis method using a shape-variable blank model with concave and convex shapes and a flat blank model was implemented. Therefore, the following is based on... Figure 10 , Figure 11 This will be explained. Additionally, a billet model using 1.2mm thick, 1.5GPa grade steel plate will be used. Figure 10 , Figure 11 The numerical values, concentrations, convex shapes, and concave shapes shown have the same meanings as those shown in the above embodiments.

[0077] Figure 10 This refers to the stamped product after demolding, assuming the molding process is based on CAE analysis and is set as plastic forming. Figure 10 (a) Use Figure 3 The flat billet model 3 shown is shown. Figure 10 (b) Using Figure 5 , Figure 6 The convex-concave shape of the blank model 7 is shown.

[0078] When the billet is flat, such as Figure 10 As shown in (a), the variation at the left end of the first shape 5 is 4.3 mm, the left end of the tension flange is -0.6 mm, the central part is 3.3 mm, the right side tension flange is 1.8 mm, and the right end is -2.1 mm. In contrast, as... Figure 10 As shown in (b), when using the shape-modifying blank model 7, the variation at the left end of the second shape 9 is 5.8 mm, the left end of the stretching flange is -1.5 mm, the central part is 3.0 mm, the right stretching flange is 1.6 to 1.9 mm, and the right end is -1.8 mm. It can be seen that when using the shape-modifying blank model 7, compared with the case of a flat blank, the variation at the left end of the second shape 9 and the left end of the stretching flange from the bottom stop of forming is larger.

[0079] The deviation of the second shape 9 obtained under the plastic forming condition corresponds to the shape change blank model 7 with concave and convex shapes, and is shown in Figure 11 .like Figure 11As shown, the deviation at the left end of the second shape 9 is the largest, at 1.5 mm, which is greatly influenced by the convex shape at the left end of the shape-changing blank model 7 corresponding to this part. In addition, it can be seen that the deviation at the left end of the stretching flange is large, at -0.9 mm, which is greatly influenced by the concave shape of the blank before stamping corresponding to these parts.

[0080] When joining components used to assemble the car body, a threshold of ±0.5mm is set for deviations corresponding to shape accuracy to predict the quality of stamped parts using shape-variant blanks with concave and convex shapes. The result is that the required precision can be readily assessed. Figure 11 The shapes of the left end of the second shape 9 and the left end of the stretch flange are modified, so that a stamped product with a good shape can be manufactured by modifying the mold corresponding to the part and stamping.

[0081] Industrial applicability

[0082] According to the present invention, a stamping analysis method, a stamping analysis apparatus, and a stamping analysis program are provided for predicting the influence of shape deformation of a blank obtained from a metal sheet with shape deformation during stamping.

[0083] Explanation of reference numerals in the attached figures

[0084] 1. Stamped product (target shape);

[0085] 3. Flat billet model;

[0086] 5. First shape;

[0087] 7. Shape-changing billet model;

[0088] 9. Second shape;

[0089] 11. Stamping forming analysis device;

[0090] 13 Display devices;

[0091] 15 Input devices;

[0092] 17 storage devices;

[0093] 19. Data storage for operation;

[0094] 21. Computation and processing unit;

[0095] 23. First shape acquisition part;

[0096] 25 Production Department;

[0097] 27. Second shape acquisition part;

[0098] 29. Deviation amount acquisition section;

[0099] 31. Shape files for blanks and stamped products.

Claims

1. A stamping forming analysis method for predicting the influence of shape deformation of a blank obtained from a metal sheet with shape deformation during stamping, characterized in that, Include: In the first shape acquisition step, a flat blank model with a flat shape is used to perform stamping analysis when stamping is performed with a specified mold model, and the shape of the stamped product after demolding is obtained as the first shape. The generation step generates a shape-change blank model corresponding to the shape change. In the second shape acquisition step, the shape-changing blank model is used to perform stamping analysis when stamping is performed with the specified mold model, and the shape of the stamped product after demolding is obtained as the second shape. The deviation amount acquisition step involves comparing the first shape and the second shape to determine the deviation location and deviation amount of the two shapes.

2. The stamping forming analysis method according to claim 1, wherein the shape-changing blank model generated in the generation step is a blank model with a periodic wave shape, wherein the periodic wave shape has a specified spacing and a specified amplitude.

3. The stamping forming analysis method according to claim 1, wherein the shape variation blank model generated in the generation step is a blank model generated based on the measurement results of the actual blank obtained from the metal sheet with shape variation.

4. The stamping analysis method according to any one of claims 1 to 3, wherein the deviation amount acquisition step obtains the difference between the springback amount of a specified portion in the first shape and the springback amount of the same portion in the second shape as the specified portion in the first shape as the deviation amount.

5. The stamping analysis method according to any one of claims 1 to 3, further comprising a determination step, wherein the portion where the deviation exceeds a preset threshold is determined as the portion requiring countermeasures.

6. The stamping analysis method according to claim 4 further includes a determination step, in which the part where the deviation exceeds a preset threshold is determined as the part where countermeasures need to be taken.

7. A stamping analysis apparatus for predicting the influence of shape deformation of a blank obtained from a metal sheet with shape deformation during stamping, characterized in that, have: The first shape acquisition unit uses a flat blank model with a flat shape to perform stamping analysis when stamping with a specified mold model, and obtains the shape of the stamped product after demolding as the first shape. The generation unit generates a shape-changing blank model corresponding to the shape change; The second shape acquisition unit uses the shape-changing blank model to perform stamping analysis when stamping is performed with the specified mold model, and obtains the shape of the stamped product after demolding as the second shape. The deviation acquisition unit compares the first shape and the second shape to determine the deviation location and deviation amount of the two shapes.

8. The stamping analysis apparatus according to claim 7, wherein the shape-changing blank model generated in the generating section is a blank model with a periodic wave shape, the periodic wave shape having a predetermined spacing and a predetermined amplitude.

9. The stamping analysis apparatus according to claim 7, wherein the shape-variable blank model generated in the generating section is a blank model generated based on the measured value of the shape of the actual blank obtained from the metal sheet with shape variation.

10. The stamping analysis apparatus according to any one of claims 7 to 9, wherein the deviation amount acquisition unit acquires the difference between the springback amount of a predetermined portion in the first shape and the springback amount of the same portion in the second shape as the predetermined portion of the first shape as the deviation amount.

11. The stamping analysis apparatus according to any one of claims 7 to 9, further comprising a determination unit that determines the portion where the deviation exceeds a preset threshold as a portion requiring countermeasures.

12. The stamping analysis apparatus according to claim 10, further comprising a determination unit, the determination unit determining the portion where the deviation exceeds a preset threshold as a portion requiring countermeasures.

13. A stamping analysis program product, characterized in that, It includes a stamping analysis program, which, when executed by a computer, implements the stamping analysis method according to any one of claims 1 to 6.

14. A stamping analysis program product, characterized in that, The program includes a stamping analysis procedure that predicts the influence of shape variations in a blank obtained from a sheet metal with shape variations during stamping. The program is characterized by comprising: The first shape acquisition unit uses a flat blank model with a flat shape to perform stamping analysis when stamping with a specified mold model, and obtains the shape of the stamped product after demolding as the first shape. The generation unit generates a shape-changing blank model corresponding to the shape change; The second shape acquisition unit uses the shape-changing blank model to perform stamping analysis when stamping is performed with the specified mold model, and obtains the shape of the stamped product after demolding as the second shape. The deviation acquisition unit compares the first shape and the second shape to determine the deviation location and deviation amount of the two shapes.

15. The stamping analysis program product according to claim 14, wherein the shape-changing blank model generated in the generating section is a blank model with a periodic wave shape, the periodic wave shape having a predetermined spacing and a predetermined amplitude.

16. The stamping analysis program product according to claim 14, wherein the shape-variable blank model generated in the generation section is a blank model generated based on the measured value of the shape of the actual blank obtained from the metal sheet with shape variation.

17. The stamping analysis procedure product according to any one of claims 14 to 16, wherein the deviation amount acquisition unit acquires the difference between the springback amount of a predetermined portion in the first shape and the springback amount of the same portion in the second shape as the predetermined portion of the first shape as the deviation amount.

18. The stamping analysis program product according to any one of claims 14 to 16, further comprising a determination unit that determines the portion where the deviation exceeds a preset threshold as a portion requiring countermeasures.

19. The stamping analysis program product according to claim 17, further comprising a determination unit, the determination unit determining the part where the deviation exceeds a preset threshold as the part where countermeasures need to be taken.

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