Press-forming analysis method and device, press-forming analysis program, and method for manufacturing press-formed article

Abstract

This press forming analysis method comprises: a mold model creation step (S1) in which a mold model having a virtual thickness is created using a two-dimensional element, and boundary conditions of the two-dimensional element are set such that a region corresponding to a rib in an actual mold becomes a rigid body and a region other than the rib becomes a non-rigid body; and a press-forming load acquisition step (S3) for acquiring a press-forming load by performing press-forming analysis using the die model created by the die model creation step (S1).

Description

Technical Field

[0001] The present invention relates to a press forming analysis method and device capable of predicting a press forming load acting on a press forming die in conjunction with a press working of a metal member, a press forming analysis program for enabling a computer to function as a press forming analysis device, and a method for manufacturing a press formed product. In this specification, metal members are hot rolled steel sheets, cold rolled steel sheets, or surface treated steel sheets obtained by surface treatment (electro-galvanizing, hot-dip galvanizing, organic finishing, etc.) of steel sheets, and include metal sheets composed of various metals such as SUS (stainless steel), aluminum, and magnesium. Background Art

[0002] The application of high-tensile steel sheets in automotive bodies is expanding in response to the increasing demand for improved fuel efficiency and collision safety achieved by weight reduction of automobiles. For high-tensile steel sheets, the decrease in formability due to low ductility and the deterioration in dimensional accuracy due to high material strength are considered to be issues for applying high-tensile steel sheets.

[0003] In addition, when high-tensile steel sheets are press-formed, the press forming load increases. However, when the press forming load exceeds a specified value due to the relationship with the press machine, the press line needs to be changed or the parts need to be divided. Therefore, a press forming analysis method that can accurately predict the press forming load in advance is sought.

[0004] Regarding this point, the following method is proposed in Patent Document 1: a correlation approximate equation is obtained between the forming load at the bottom dead center of the press in an actual machine and the forming load under the stroke before the bottom dead center of the press based on press forming analysis, and the press forming load is obtained based on the correlation approximate equation.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 5610574 Summary of the invention

[0008] Problems to be solved by the invention

[0009] In the method described in Patent Document 1, the press forming load at the bottom dead point of the press in an actual machine needs to be calculated in advance, and therefore, the press forming load under a new component shape or material cannot be predicted in advance.

[0010] The present invention is completed to solve the above-mentioned problems, and its purpose is to provide a stamping analysis method and device that can predict in advance the stamping load acting on the stamping die when stamping a new component shape or material. In addition, another purpose of the present invention is to provide a stamping analysis program that allows a computer to function as the stamping analysis device. Moreover, another purpose of the present invention is to provide a method for manufacturing a stamping product using a stamping machine selected based on the stamping load predicted by the stamping analysis method to manufacture the stamping product.

[0011] Means for solving problems

[0012] The stamping analysis method of the present invention is a method capable of predicting the stamping load acting on a stamping die, wherein the stamping analysis method includes: a die model making process, using a two-dimensional element to make a die model (die model) with an imaginary thickness, setting the boundary conditions (boundary conditions) of the two-dimensional element in a manner that the portion equivalent to the rib in the actual die (real die) becomes a rigid body (rigid body) and the portion other than the rib becomes a non-rigid body (nonrigidity); and a stamping load acquisition process, using the die model made by the die model making process to perform stamping analysis and obtain the stamping load, in the die model making process, in order to make the die model have an imaginary thickness, the configuration of the two-dimensional element is offset (offset) from the die surface by a specified distance, and according to the offset amount, the boundary conditions of the two-dimensional element are set in a manner that the deflection of the die model is equivalent to the deflection (deflection) of the actual die.

[0013] Preferably, the boundary conditions in the mold model making process are composed of any one of displacement restraint, elastic coefficient, sheet thickness, density, mass, yield strength, or a combination thereof.

[0014] Preferably, the two-dimensional element is an elastic or elastic-plastic two-dimensional element.

[0015] The stamping analysis device of the present invention is capable of predicting the stamping load acting on the stamping die, wherein the stamping analysis device comprises: a die model making unit, which uses two-dimensional elements to make a die model with an imaginary thickness, and sets the boundary conditions of the two-dimensional elements in a manner that the portion equivalent to the ribs in the actual die becomes a rigid body and the portion other than the ribs becomes a non-rigid body; and a stamping load acquisition unit, which uses the die model made by the die model making unit to perform stamping analysis and acquire the stamping load, wherein the die model making unit offsets the configuration of the two-dimensional elements from the die surface by a specified distance in order to make the die model have an imaginary thickness, and sets the boundary conditions of the two-dimensional elements in a manner that the deflection of the die model is equivalent to the deflection of the actual die according to the offset amount.

[0016] The stamping analysis program of the present invention causes a computer to function as the stamping analysis device of the present invention.

[0017] The manufacturing method of the stamped product of the present invention includes: a process of obtaining the stamping load using the stamping analysis method of the present invention; a stamping machine selection process of selecting a suitable stamping machine with a pressurizing capacity of the obtained stamping load; and a stamping process of using the stamping machine to perform stamping.

[0018] Effects of the Invention

[0019] According to the present invention, the stamping load acting on the stamping die when stamping a new component shape or material can be predicted in advance with high accuracy. In addition, as a result, a stamping machine with a press capacity suitable for producing components can be selected. Moreover, by selecting a stamping machine with a suitable press capacity to stamp a stamped product, the reduction in the life of the stamping die caused by the elastic deformation of the frame of the stamping machine, etc. can be suppressed, and the generation of burrs, etc. of the stamped product can be suppressed to improve manufacturing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a flowchart of the stamping analysis method according to the first embodiment.

[0021] Figure 2 This is a block diagram showing the structure of a stamping analysis device according to the second embodiment.

[0022] Figure 3 This is an explanatory diagram of the shape of the components used as the target in the first embodiment.

[0023] Figure 4 is an explanatory diagram of the mold used in Example 1, Figure 4 (a) shows the forming surface, Figure 4 (b) shows the lower surface of the mold.

[0024] Figure 5 This is a diagram showing a conventional mold model produced by a conventional method.

[0025] Figure 6 This is a diagram showing an inventive example mold model produced by the method of the present invention.

[0026] Figure 7 This is an explanatory diagram (part 1) of a method for giving a virtual thickness to a mold model based on two-dimensional elements.

[0027] Figure 8 This is an explanatory diagram (part 2) of a method for giving a virtual thickness to a mold model based on two-dimensional elements.

[0028] Fig. 9This is an explanatory diagram (part 3) of a method for giving a virtual thickness to a mold model based on two-dimensional elements.

[0029] Fig.10 This is a diagram for explaining the concept of the equivalent elastic coefficient in Example 1.

[0030] Fig.11 This is a graph showing the analysis results of Example 1.

[0031] Fig.12 This is an explanatory diagram of the shape of the components used as the target in the second embodiment.

[0032] Fig.13 This is a graph showing the analysis results of Example 2 and the required press capacity based on the analysis results. DETAILED DESCRIPTION

[0033] First, the process leading to the present invention is described. When the inventors studied a stamping analysis method capable of predicting stamping loads using stamping analysis based on the finite element method (FEM), they first studied the reasons why stamping loads could not be accurately predicted.

[0034] Generally speaking, in the finite element method, two-dimensional elements of rigid bodies are applied to the modeling of stamping dies. In the stamping analysis using such two-dimensional elements, the stamping load increases sharply near the lower dead point of the stamping. The inventor studied this phenomenon and found out that the reason is that since the stamping die, which is originally an elastic-plastic body, is treated as a completely non-deformable rigid body, the deformation of the die at the lower dead point of the stamping is not reproduced, and only the stamped product 21 (blank) is excessively deformed.

[0035] Furthermore, in order to accurately predict the stamping load, a stamping analysis that takes into account the deformation of the stamping die is considered necessary. In this regard, a stamping analysis that takes into account the deformation of the stamping die by using non-rigid solid elements (three-dimensional elements) to represent the structure of the stamping die is implemented, but the calculation time is huge and not suitable for practical use. Therefore, a method of considering the deformation of the stamping die using shell elements (two-dimensional elements) with shorter calculation time is studied. Furthermore, the following conclusion is reached: the stamping die is modeled by making the surface of the stamping die as a non-rigid (elastic or elastoplastic) shell model (two-dimensional element) with an imaginary thickness, and the rigidity (stiffness) is given by using boundary conditions.

[0036] The present invention has been completed based on the above-mentioned research results, and specifically has the following structure.

[0037] [Implementation Method 1]

[0038] The stamping forming analytical method of the present invention is a stamping forming analytical method capable of predicting the stamping forming load acting on the stamping die. Figure 1 As shown in FIG. 1 , the die model making process ( S1 ) and the press forming load obtaining process ( S3 ) are included.

[0039] <Mold model making process>

[0040] The mold model preparation step (S1) is a step of preparing a mold model having an imaginary thickness using two-dimensional elements, and setting boundary conditions of the two-dimensional elements so that the parts corresponding to the ribs in the actual mold become rigid bodies and the parts other than the ribs become non-rigid bodies.

[0041] Furthermore, in order to make the mold model have an imaginary thickness, the configuration of the two-dimensional element is offset from the mold surface by a predetermined distance, and the boundary conditions of the two-dimensional element are set in a manner that the deflection of the mold model is equivalent to the deflection of the actual mold according to the offset amount. The boundary conditions in the mold model manufacturing step (S1) are composed of any one of displacement constraints, elastic modulus, plate thickness, density, mass, and yield strength, or a combination thereof. In addition, the two-dimensional element can be any elastic or elastoplastic two-dimensional element.

[0042] <Press Forming Load Acquisition Process>

[0043] The stamping load acquisition step (S3) is a step of performing stamping analysis using the die model produced in the die model production step (S1) to obtain the stamping load. The stamping load obtained may be a load acting on the entire stamping die or a surface pressure distribution of the stamping die.

[0044] In the present embodiment, the stamping die is modeled by making the surface of the stamping die as a non-rigid (elastic or elastoplastic) shell model (two-dimensional element) with an imaginary thickness, and the rigidity is given by boundary conditions. Therefore, the calculation of the stamping analysis based on the finite element method for obtaining the stamping forming load does not take time, so the calculation time can be shortened compared to the stamping forming analysis using non-rigid solid elements (three-dimensional elements) for the structure of the stamping die. In addition, when the rigidity distribution setting of the die model is changed, it is sufficient to change the boundary conditions. Therefore, there is no need to model the die model every time, and the stamping die structure that can reduce the stamping forming load can be designed in a short time.

[0045] [Implementation Method 2]

[0046] The stamping analysis method described in Embodiment 1 can be implemented by causing a computer to execute a pre-set program. In this embodiment, a stamping analysis device is described as an example of such a device. Figure 2 As shown, the stamping analysis device 1 of the present embodiment is composed of a computer such as a PC (personal computer), and has a display device (display element) 3, an input device (input device) 5, a storage device (memory storage) 7, a working data memory (working data memory) 9 and an arithmetic processing unit (arithmetic processing unit) 11. In addition, the display device 3, the input device 5, the storage device 7 and the working data memory 9 are connected to the arithmetic processing unit 11, and their respective functions are executed by instructions from the arithmetic processing unit 11. Hereinafter, each structure of the stamping analysis device 1 of the present embodiment will be described.

[0047] ≪Display device≫

[0048] The display device 3 is used to display analysis results, and is composed of a liquid crystal monitor (LCD monitor) or the like.

[0049] ≪Input device≫

[0050] The input device 5 is used for display instructions of blanks, press-formed products, etc., and input of conditions by the operator, and is composed of a keyboard, a mouse, etc.

[0051] Storage Devices

[0052] The storage device 7 is used to store various files such as CAD data of a die, shape files of blanks and press-formed products, and is composed of a hard disk or the like.

[0053] ≪Working data storage≫

[0054] The working data memory 9 is used for temporary storage and calculation of data used in the calculation processing unit 11 and is composed of a RAM (Random Access Memory) and the like.

[0055] ≪Calculation Processing Unit≫

[0056] like Figure 2As shown, the calculation processing unit 11 has a mold model making unit 13 and a stamping forming load obtaining unit 15, and is composed of a CPU (central processing unit). These units function by executing a predetermined program by the CPU. The functions of the above-mentioned units in the calculation processing unit 11 are described below.

[0057] The mold model making unit 13 makes a mold model with an imaginary thickness using two-dimensional elements, and sets boundary conditions of the two-dimensional elements so that the portion corresponding to the ribs in the actual mold becomes a rigid body and the portion other than the ribs becomes a non-rigid body. The mold model making unit 13 executes the mold model making step (S1) described in the first embodiment.

[0058] The stamping load acquisition unit 15 performs stamping analysis using a die model for which stiffness distributions are set, and acquires the stamping load. The stamping load acquisition unit 15 executes the stamping load acquisition step (S3) described in the first embodiment.

[0059] According to the stamping analysis device 1 of the present embodiment, similarly to the first embodiment, it is possible to design a structure of a stamping die capable of reducing a stamping load in a short time.

[0060] As described above, the die model making unit 13 and the stamping load acquisition unit 15 in the stamping analysis device 1 of the present embodiment can be realized by the CPU executing a predetermined program. Therefore, the stamping analysis program of the present invention can be determined as a program that enables the computer to function as the die model making unit 13 and the stamping load acquisition unit 15.

[0061] Example 1

[0062] In order to confirm the effects of the present invention, a specific press forming analysis was performed, and therefore, it will be described below. Figure 3The component shape of the stamped product 21 set as the object of the embodiment is shown. The stamped product 21 is bent into a substantially S-shape when viewed from above, and is a hat-shaped cross-section having a top plate portion 23, a side wall portion 25 on both sides of the top plate portion 23, and a flange portion 27 at the lower end of the side wall portion 25. The curvature radius of the punch shoulder R portion 29 connecting the top plate portion 23 and the side wall portion 25 and the die shoulder R portion 31 connecting the side wall portion 25 and the flange portion 27 is 6 mm. In addition, the material of the stamped product 21 is a 1180 MPa-grade high-tensile cold-rolled steel plate with a plate thickness of 1.6 mm.

[0063] Figure 4 Showing the forming Figure 3 A die 33 of the press-formed product 21 is shown. Figure 4 The mold 33 shown corresponds to the forming Figure 3 The die of the die 33 (punch, die, etc.) of the component shown in FIG. 1 is a die, and the punch of the other die 33 has a shape corresponding to the die. Figure 4 The mold 33 (die) shown is used as an example for explanation.

[0064] like Figure 4 As shown in (a), a groove shape portion 35 corresponding to the component is formed on the forming surface side of the die 33. On both sides of the groove bottom, there are first R portions 37 corresponding to the punch shoulder R portion 29 of the stamped product 21, and in addition, there is a second R portion 39 corresponding to the die shoulder R portion 31 of the stamped product 21 at the entrance of the groove. The curvature radius of these first R portion 37 and second R portion 39 is 6 mm. In addition, as shown in Figure 4 As shown in (b), the periphery of the mold 33 becomes a non-deformed rib portion 41, and the portion corresponding to the groove bottom also becomes a non-deformed rib portion 43. The portion other than the rib portion 41 and the rib portion 43 is a deformed portion, and its thickness is 30 mm.

[0065] In this embodiment, the Figure 4 The mold 33 shown is a conventional mold model 45 (see Figure 5 ) and the inventive example mold model 47 (refer to Figure 6 ) is subjected to stamping forming analysis to obtain the forming load. Furthermore, the forming load obtained by the stamping forming analysis is compared with the forming load in the actual machine.

[0066] for Figure 5 The conventional mold model 45 shown does not take the mold deformation (die deformation) into consideration, and only configures a mesh (mesh model) based on two-dimensional elements (shell elements) on the mold surface (die-face) in contact with the blank, and sets the entire mesh as a rigid body. On the other hand, for the inventive mold model 47, the two-dimensional elements (shell elements) are set as non-rigid bodies, and the mold deformation within the elastic range is taken into consideration. That is, for the inventive mold model 47, a mold model is made in which the mesh based on the two-dimensional elements has an imaginary thickness, and the boundary conditions of the two-dimensional elements are set in such a way that the portions corresponding to the rib shape portion 41 and the rib shape equivalent portion 43 in the actual mold become rigid bodies, and the portions other than these portions become non-rigid bodies. Figure 6 , make the color of the rigid body dark gray.

[0067] A cross section of a flat portion (excluding the rounded part) of a mold is schematically shown using Figure 7 A method for making a mesh (mold model) based on two-dimensional elements have the thickness of an imaginary mold is described. In order to make a mesh based on two-dimensional elements have the thickness of an imaginary mold, as shown in FIG. Figure 7 As shown in (a), the thickness t of the imaginary die is set. In addition, a mesh based on two-dimensional elements (die mesh model) is configured at a position offset by 1 / 2 of the thickness t (t / 2) of the die in the vertical direction from the actual die surface (the side in contact with the blank) toward the thickness center of the die, that is, at the center of the thickness of the imaginary die. Figure 7 As shown in (b), the imaginary mold surface of the mold model on the side in contact with the blank is set at a position offset by 1 / 2 (t / 2) of the mold thickness t in the vertical direction from the mold grid toward the mold surface on the side in contact with the blank. Figure 7 In the figure, the arrow indicates the direction of the bias (in Figure 8 and Fig. 9 The same is true in ).

[0068] As described above, the die 33 of the present embodiment is a die having a punch shoulder R portion 29 and a die shoulder R portion 31 (R portion) with a thickness of 30 mm and a radius of curvature of 6 mm. As an example of manufacturing a die model based on the die 33 of the present embodiment, the Figure 8 and Fig. 9 will be described. Figure 8 This is a case where the imaginary thickness t of the die model is the same as the thickness of the die 33, which is 30 mm. As shown in Figure 8 (a), at a position offset by 1 / 2 of the thickness of the die 33, which is 15 mm (> the radius of curvature of the R portion, 6 mm), in the direction perpendicular to the die surface (the side in contact with the blank) of the die 33 including the R portion with a radius of curvature of 6 mm, that is, at the central position of the imaginary thickness of the die, a die mesh is arranged. In this case, since the offset amount of 15 mm from the die surface exceeds the radius of curvature of the R portion, which is 6 mm, the corresponding portion of the R portion on the die mesh becomes a corner (R’) with a radius of curvature of 0 mm. And, as shown in Figure 8 (b), the imaginary die surface of the die model is set at a position offset by 1 / 2 of the thickness of the die 33, which is 15 mm, in the vertical direction from the die mesh toward the die surface in contact with the blank. Then, the corresponding portion of the R portion on the imaginary die surface of the die model becomes a corner (R”) with a radius of curvature of 0 mm. That is, if a die mesh offset based on the actual thickness of 30 mm of the die 33 is assumed, the R portion will not be reproduced on the imaginary die surface of the die model. Therefore, for the imaginary die thickness t of the mesh (die model) based on two-dimensional elements, it is necessary to set the offset amount (t / 2) from the die surface within a range not exceeding the radius of curvature of the R portion of the die so that the R portion of the die can be reproduced on the imaginary die surface of the die model.

[0069] Fig. 9 This is a case where the imaginary die thickness t of the mesh (die model) based on two-dimensional elements is set in such a way that the R portion of the actual die 33 can be reproduced on the imaginary die surface of the die model. Specifically, the imaginary thickness t of the die model is set to 1 / 10 of the thickness of the actual die 33, which is 30 mm, that is, 3 mm, and the offset amount (t / 2) from the die surface is 1.5 mm (< the radius of curvature of the R portion, 6 mm). Thus, as shown in Fig. 9 (a), the die mesh has a curvature corresponding to the R portion, and as shown in Fig. 9 (b), the R portion of the actual die 33 can be reproduced on the imaginary die surface of the die model. However, in Fig. 9In the case of , the mold thickness (3 mm) in the analysis is thinner than the thickness (30 mm) of the actual mold 33, and the rigidity of the actual mold 33 cannot be reproduced. Therefore, when the offset amount from the mold surface of the two-dimensional element is determined in a manner that can reproduce the mold surface of the actual mold 33, the elastic coefficient (Young's modulus) of the two-dimensional element is corrected in a manner that the deflection of the mold model (two-dimensional element) with an imaginary thickness is the same as the deflection of the actual mold 33 (hereinafter, the corrected elastic coefficient is referred to as "equivalent elastic coefficient").

[0070] The following is based on Fig.10 To illustrate the concept of equivalent elastic coefficient. Fig.10 The elastic deformation of the mold surface is shown as the deformation of a simple beam. Fig.10 (a) is the actual mold thickness t, Fig.10 (b) shows the case where the thickness is t / a. If this is considered, as shown in formula (1), the equivalent elastic coefficient Ec (MPa) becomes the value obtained by multiplying the elastic coefficient E (MPa) of the actual mold by the cube of the thickness ratio a (actual mold thickness / hypothetical thickness of the two-dimensional element).

[0071] Ec=E·a 3 …(1)

[0072] As the boundary condition of the two-dimensional element set in a manner that makes the deflection of the mold model equivalent to the deflection of the actual mold based on the offset amount, as shown in the above-mentioned embodiment, any one of the elastic modulus, displacement constraint, plate thickness, density, mass, yield strength or a combination thereof can be appropriately selected.

[0073] In the analysis of the embodiment, it is assumed that the die rigidity of the rib-shaped portion 41 and the rib-shaped corresponding portion 43 in the punching direction is sufficiently high and the displacement in the punching direction is restricted. Fig.11 The actual machine stamping forming load and Figure 5 The conventional mold model 45 and Figure 6 The forming load prediction results of the invention example die model 47 are shown. The stamping forming load of the actual machine is 1002 kN, the forming load of the conventional example is 1375 kN, which is 137% of the actual machine, and the forming load of the invention example is 1087 kN, which is 108% of the actual machine, which shows that the forming load prediction accuracy is improved.

[0074] Example 2

[0075] Next, a specific example will be shown to explain that the selection of a press machine becomes appropriate as an effect of applying the present invention. Fig.12The shape of the component 49 used as the object in this embodiment is shown. The material of the component 49 is a 1180MPa grade high-tensile cold-rolled steel plate with a plate thickness of 1.4mm. As in the first embodiment, the die model of the prior art example and the invention example was used to perform stamping analysis on the component 49 and the forming load was obtained, which was 4225kN and 3300kN respectively.

[0076] A press machine is generally selected so that the forming load is 80% or less of the press machine's capacity. Fig.13 The figure shows the press machine capacity estimated from the forming load prediction results of the conventional example and the invention example and plotted in a graph. Fig.13 As shown, in the conventional example, a punching machine with a capacity of 5300 kN or more is selected with a 20% margin relative to the load prediction of 4225 kN. In contrast, in the inventive example, the load prediction is 3300 kN, so the selected punching machine is 4200 kN or more, which enables a more appropriate selection of the punching machine.

[0077] Industrial Applicability

[0078] According to the present invention, a stamping analysis method and device can be provided that can predict in advance the stamping load acting on the stamping die when stamping a new component shape or material. In addition, according to the present invention, a stamping analysis program that allows a computer to function as the stamping analysis device can be provided. Moreover, according to the present invention, a method for manufacturing a stamped product can be provided that uses a stamping machine selected based on the stamping load predicted by the stamping analysis method to manufacture the stamped product.

[0079] Description of Reference Numerals

[0080] 1 Stamping forming analysis device

[0081] 3 Display device

[0082] 5 Input Devices

[0083] 7 Storage Devices

[0084] 9 Data storage for operation

[0085] 11. Calculation Processing Unit

[0086] 13 Mold Model Making Department

[0087] 15 Press forming load acquisition unit

[0088] 21 Stamping products

[0089] 23 Top plate

[0090] 25 Vertical wall

[0091] 27 Flange

[0092] 29 Punch shoulder R

[0093] 31 Die shoulder R

[0094] 33 Mould

[0095] 35 Groove shape part

[0096] 37 Part 1R

[0097] 39 Part 2R

[0098] 41 rib shape

[0099] 43 Rib shape equivalent

[0100] 45 Previous mold model

[0101] 47 Invention Example Mold Model

[0102] 49 parts.

Claims

1. A stamping analysis method capable of predicting the stamping load acting on a stamping die, wherein: The stamping forming analysis method includes: A mold model making step, using two-dimensional elements to make a mold model with an imaginary thickness, and setting boundary conditions of the two-dimensional elements in such a way that a portion corresponding to a rib in an actual mold becomes a rigid body and a portion other than the rib becomes a non-rigid body; and The stamping load acquisition step is to perform stamping analysis using the die model produced in the die model production step to obtain the stamping load. In the mold model production process, in order to make the mold model have an imaginary thickness, the configuration of the two-dimensional element is offset from the mold surface by a specified distance, and the boundary conditions of the two-dimensional element are set in a manner that the deflection of the mold model is equivalent to the deflection of the actual mold based on the offset amount.

2. The stamping forming analysis method according to claim 1, wherein: The boundary conditions in the mold model manufacturing process are composed of any one of displacement constraints, elastic modulus, plate thickness, density, mass, yield strength, or a combination thereof.

3. The stamping analysis method according to claim 1 or 2, wherein: The two-dimensional element is an elastic or elastoplastic two-dimensional element.

4. A stamping analysis device capable of predicting a stamping load acting on a stamping die, wherein: The stamping analysis device has: A mold model making unit makes a mold model having an imaginary thickness using two-dimensional elements, and sets boundary conditions of the two-dimensional elements in such a way that a portion corresponding to a rib in an actual mold becomes a rigid body and a portion other than the rib becomes a non-rigid body; and The stamping load acquisition unit performs stamping analysis using the die model produced by the die model production unit to acquire the stamping load. In order to make the mold model have an imaginary thickness, the mold model production unit offsets the configuration of the two-dimensional element from the mold surface by a specified distance, and sets the boundary conditions of the two-dimensional element in a manner that the deflection of the mold model is equivalent to the deflection of the actual mold according to the offset amount.

5. A stamping analysis program that causes a computer to function as the stamping analysis device according to claim 4.

6. A method for manufacturing a stamped product, wherein: The method for manufacturing the stamped product comprises: A step of obtaining a stamping load using the stamping analysis method according to claim 1 or 2; A press selection step of selecting a suitable press having a press capacity corresponding to the obtained press forming load; and The press forming step uses the press machine to perform press forming.

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