JP7036521B2 - Deformation factor analysis method for pressed parts and design method for pressed parts using this analysis result - Google Patents

Description

The present invention relates to a method for analyzing deformation factors of pressed parts and a method for designing pressed parts using the analysis results.

For example, press molding is generally used in the manufacturing process of panel-shaped parts such as steel plates used for automobile bodies. In the parts obtained by press molding (hereinafter referred to as press parts) as described above, springback usually occurs not a little at the time of mold opening due to the residual stress generated at the time of press molding (during mold clamping). Since this springback can cause poor dimensional accuracy, deformation during press molding is predicted in advance by numerical analysis such as FEM (finite element method), and countermeasures are being studied (see, for example, Patent Document 1). ..

Japanese Unexamined Patent Publication No. 2013-198927

In this way, when predicting deformation during press forming in advance, conventionally, the design of the pressed part or die (pressing die) is changed based on the difference between the normal shape (shape as shown in the drawing) and the predicted shape. Was there. However, the changed part and the amount of change at this time are mainly set based on the empirical rule of the operator, and cannot be said to be an appropriate design change after understanding the deformation mechanism of the pressed part by press forming. rice field. Therefore, for example, when considering the application of high-strength steel such as ultra-high-tensile steel as a measure to reduce weight in recent years, the knowledge and data on deformation during press forming that have been cultivated so far will be diverted to high-strength steel as it is. This is difficult, and it takes time and effort to repeatedly perform basic experiments and conventional stress analysis to collect knowledge and data on the above deformation from scratch.

In view of the above circumstances, in the present invention, it is a technical problem to be solved to improve the design accuracy of the pressed parts in a versatile and easy manner by elucidating the deformation mechanism at the time of press molding.

The solution to the above problems is achieved by the method for analyzing deformation factors of pressed parts according to the present invention. That is, this analysis method includes a right-size model creation step for creating a right-size model of a pressed part obtained by press molding, and a deformation mode setting step for setting a plurality of deformation modes that can occur in the pressed part by press molding. It is equipped with a factor stress setting step that sets the factor stress that causes the deformation mode for each deformation mode, and a deformation analysis step that analyzes the deformation of the right size model when the factor stress is applied to the right size model independently. Characterized by dots. The exact size model of the pressed part referred to here means an analysis model having the drawing dimensions of the pressed part at the time before the start of this analysis method.

Conventionally, in the deformation analysis during press molding, for example, as shown in FIG. 1, the die is fastened from the state where the material 1a to be pressed is arranged between the press dies 2 and 3 (see FIG. 1A). After press molding, stress analysis of the materials to be pressed 1a to 1c is performed in the order of each step up to the state (see FIG. 1 (b)) and the state in which the mold is opened (FIG. 1 (c)). Deformation (see FIG. 1 (d)) was predicted. Therefore, the material 1c to be pressed (that is, the pressed part) after press molding has a residual stress distribution caused by mold clamping and deformation after mold opening caused by this residual stress distribution (for example, after the above-mentioned press molding). The difference between the shape 1c and the normal shape 1c', etc.) was obtained as only one result.

On the other hand, in the present invention, the cause of deformation such as springback is specified through a procedure different from the conventional time-series procedure. That is, in the present invention, the deformation generated in the pressed part by press molding is decomposed into deformation for each part or simple deformation (for example, a plurality of deformation modes M1, M2 ... Shown in FIGS. 2 (b) to 2 (d)). I decided to evaluate it. Further, in order to quantitatively evaluate the factors, the factor stresses that cause the deformation modes M1, M2 ... It was decided to apply it to the exact size model 10 of the pressed part (see FIG. 2A) and perform deformation analysis of the exact size model 10. In this way, by applying the factor stress that causes each deformation mode and analyzing the deformation analysis result of the exact size model at that time, for example, the cause of one deformation mode is the said in the above size model. The effect on the deformation mode can be objectively evaluated. Therefore, by performing the above-mentioned deformation analysis for all parts of the pressed parts and all types of deformation modes, it is possible to systematically identify, organize, and grasp (visualize) the deformation factors of the entire pressed parts. .. This makes it possible to take appropriate measures for each part type. In addition, since the influence of the cause of occurrence is clarified for each deformation mode, it is possible to easily take measures according to each deformation mode. In addition, if the deformation factors that cause dimensional accuracy defects can be clarified at the product drawing stage, for example, the effectiveness of countermeasures against dimensional accuracy defects and the risk of secondary defects can be factored into the design in advance. It is possible to improve the degree of completion of drawings in a short period of time. Therefore, it is possible to design the stamped parts at low cost. Of course, if the deformation factor at the time of press molding is clarified, it is possible to easily apply the measures based on the above-mentioned analysis results to similar parts even if the parts type is changed.

Further, the deformation factor analysis method for pressed parts according to the present invention may further include an evaluation step for evaluating the influence of the generation factor on each deformation mode based on the deformation analysis result. Further, in that case, the above influence may be evaluated by, for example, specifying the contribution degree of the generating factor contributing to each deformation mode, or the number of generating factors contributing to each deformation mode and each deformation mode. The above-mentioned influence may be evaluated by specifying the degree of contribution of each of the factors causing the above.

By evaluating using the degree of contribution in this way, for example, it is possible to specifically and objectively evaluate the influence of one deformation mode generation factor on the other deformation mode generation factors. Therefore, it is possible to more clearly and systematically identify, organize, and grasp (visualize) the deformation factors of the pressed parts.

As described above, according to the present invention, by elucidating the deformation mechanism at the time of press molding, it is possible to improve the design accuracy of the pressed parts in a versatile and easy manner.

It is a schematic diagram which shows the procedure of the stress analysis method at the time of press molding which was performed conventionally. It is a schematic diagram which shows the concept of the deformation factor analysis method of the pressed part which concerns on one Embodiment of this invention, (a) is the exact size model of the pressed part to be analyzed, (b) to (d) are by press molding. This is a specific example of a deformation mode that can occur in a pressed part. It is a flowchart which shows the flow of the design method of the pressed part which concerns on one Embodiment of this invention. It is a figure which listed the specific example of the deformation mode which can occur in the pressed part of a predetermined shape by press molding. It is a figure which listed the concrete example of the factor stress distribution which becomes the occurrence factor of each deformation mode. It is a figure which showed the example of the factor stress distribution which becomes the occurrence factor of each deformation mode schematically. It is a main part perspective view which concerns on an example of the case where the exact size model shown in FIG. 2 is made of solid elements. It is a front view of the main part which shows the state which applied the factor stress distribution by heat to the exact size model shown in FIG. 7. It is a graph which shows the contribution degree of each occurrence factor to one deformation mode. It is a graph which shows the contribution degree of each occurrence factor to other deformation modes.

Hereinafter, the contents of the deformation factor analysis method of the pressed part according to the embodiment of the present invention and the design method of the pressed part using the analysis result will be described with reference to the drawings.

FIG. 3 shows a procedure of a method for designing a pressed part according to the present embodiment. As shown in FIG. 3, this design method includes an exact size model creation step S1 for creating an exact size model of a pressed part, a deformation mode setting step S2 for setting a plurality of deformation modes that can occur in the pressed part, and a deformation mode. Factor stress setting step S3 that sets the factor stress that causes the occurrence of Based on the deformation analysis result obtained in the above, an evaluation step for evaluating the influence of the generating factors on each deformation mode, here, a contribution specifying step S5 for specifying the number of generating factors contributing to each deformation mode and the contribution degree thereof. It is provided with a contribution reflection step S6 for designing a pressed part by reflecting the influence of the generation factor on each deformation mode, here, the contribution of each generation factor to each deformation mode in the exact size model. Of these, each step from the exact size model creation step S1 to the contribution degree specifying step (evaluation step) S5 constitutes the deformation factor analysis method for the pressed part according to the present invention. In the following, as shown in FIG. 2 and the like, a case where a deformation factor analysis at the time of press molding is performed on a pressed part having a cross-sectional hat shape will be described as an example.

(S1) Exact size model creation step In this step, an exact size model of the pressed part to be analyzed is created. In the present embodiment, the pressed part is composed of a plate-shaped member and has a cross-sectional hat shape as shown in FIG. 2A, for example. Therefore, a three-dimensional analysis model is created so that the exact size model 10 of the pressed part also has a cross-sectional hat shape.

(S2) Deformation Mode Setting Step In this step, a plurality of deformation modes that may occur in the pressed part by press forming are set. Here, when selecting a specific deformation mode, past knowledge or data (stress analysis, basic experiment) related to press molding of pressed parts of the same shape but different material or similar shape (including simple shape) and the same material. It is better to do it based on the academic verification results related to the press molding. For example, as shown in FIG. 2A, as a deformation mode that can occur when a pressed part having a cross-sectional hat shape is press-molded, as shown in FIG. 4, the warp of the vertical wall portion 11 (first deformation). Mode M1), opening of the vertical wall portion 11 (second deformation mode M2), warpage of the upper wall portion 12 (third deformation mode M3), splashing of the flange portion 14 (fourth deformation mode M4), and the like. Can be mentioned.

The warp of the vertical wall portion 11 here means, for example, as shown in FIG. 2B, a mode in which the left and right vertical wall portions 11 are bent and deformed in a direction away from each other. Further, the opening of the vertical wall portion 11 is such that the vertical wall portion 11 and the vertical wall portion 11 are opened in a direction in which the angle between the inner surface of the vertical wall portion 11 and the inner surface of the upper wall portion 12 increases, as shown in FIG. It means a mode in which the corner portion (first corner portion 13) connecting the wall portion 12 is deformed. Further, the warp of the upper wall portion 12 means a mode in which the upper wall portion 12 connected to the left and right vertical wall portions 11 bends and deforms along the longitudinal direction thereof, for example, as shown in FIG. 2 (d).

Of course, depending on the shape of the pressed part that forms the cross-sectional hat shape, for example, although not shown, other deformation modes such as twisting (twisting around the virtual axis along the longitudinal direction) and bending of the entire pressed part can be further set. You may.

(S3) Factor stress setting step In this step, the factor stress that is the cause of each deformation mode, here, the factor stress distribution is set for each deformation mode. Here, when setting the factor stress distribution that is a specific factor, as in the deformation mode, past knowledge or data related to press molding of pressed parts with the same shape but different material or similar shape and the same material, etc. It is better to do it based on the academic verification results related to the press molding. For example, as shown in FIG. 4, when a plurality of deformation modes M1 to M4 that can occur when a pressed part having a cross-sectional hat shape is press-formed, the cause F1 of each deformation mode M1 (M2 to M4) is set. The factor stress distribution that becomes (F2 to F5) can be set. Specifically, as shown in FIG. 5, for the first deformation mode M1 related to the warp of the vertical wall portion 11, the stress difference between the front and back surfaces of the vertical wall portion 11 is the first generation factor F1 (factor stress distribution). ). Further, for the second deformation mode M2 related to the opening of the vertical wall portion 11, the front-back stress difference of the first corner portion 13 can be mentioned as the second generation factor F2 (factor stress distribution). Further, for the third deformation mode M3 related to the warp of the upper wall portion 12, the stress difference between the front and back surfaces of the upper wall portion 12 and the stress difference between the upper wall portion 12 and the flange portion 14 are set to the third and fourth, respectively. Can be mentioned as the factors F3 and F4 (factor stress distribution) that occur. Further, for the fourth deformation mode M4 related to the splash of the flange portion 14, the fifth generation of the front and back stress difference of the corner portion (second corner portion 15) connecting the vertical wall portion 11 and the flange portion 14 is generated. It can be mentioned as a factor F5 (factor stress distribution).

As shown in FIG. 6, for example, the stress difference between the front and back surfaces of the vertical wall portion 11 (first factor F1) is such that the outer surface 11a side is pulled in the longitudinal direction with respect to the neutral shaft 11c of the vertical wall portion 11. It means a stress distribution in which stress σ + and compressive stress σ− are generated in the longitudinal direction on the inner surface 11b side. The same stress distribution is meant for other factors F2 to F5.

Of course, as described above, when other deformation modes such as twisting and bending of the entire pressed part are further set for the pressed part having a cross-sectional hat shape, the factor stress that causes these other deformation modes ( Factor stress distribution) may be set individually.

(S4) Deformation analysis step In this step, deformation analysis of the regular size model 10 is performed when the factor stress (factorial stress distribution) that causes each deformation mode is independently applied to the regular size model 10. For example, when a plurality of deformation modes M1 to M4 shown in FIG. 4 and factor stress distributions (generation factors F1 to F5) shown in FIG. 5 are set, the factor that becomes the first generation factor F1 with respect to the exact size model 10. A stress distribution (see FIG. 6) is applied independently, and the deformation of the positive size model 10 at that time is analyzed (deformation analysis for the first deformation mode M1). Further, the factor stress distribution (see FIG. 5) that becomes the second generation factor F2 is independently applied to the regular size model 10 and the deformation of the regular size model 10 at that time is analyzed (second deformation mode M2). Deformation analysis for). Further, the factor stress distributions (see FIG. 5) that are the third and fourth generation factors F3 and F4 are independently applied to the exact size model 10 and the deformation of the exact size model 10 at that time is analyzed (). Deformation analysis for the third deformation mode M3). Further, the factor stress distribution (see FIG. 5) that becomes the fifth generation factor F5 is independently applied to the regular size model 10 and the deformation of the regular size model 10 at that time is analyzed (fourth deformation mode M4). Deformation analysis for). In short, the deformation analysis of the exact size model 10 is performed for the number of deformation modes set in step S2 (if two or more generation factors can be set for one deformation mode, the number of the generation factors).

The method of applying the factor stress distribution to the positive size model 10 is arbitrary, and general loads, displacements, stresses (initial stresses), and the like can be applied. For example, in the present embodiment, the factor stress distribution is applied to the positive size model 10 by heat (heat load). Further, in this case, for example, as shown in FIG. 7, the exact size model 10 as an analysis model is formed by a solid model having a plurality of solid elements 21 to 23 in the thickness direction thereof, and a specific solid element (here, here). By applying a thermal load to the solid elements 22, 23) on the surface side in the thickness direction forming the surface of the pressed component, the factor stress distributions that are the factors F1 to F5 that generate the deformation modes M1 to M4 are reproduced. At this time, a thermal load may be applied while the solid element 21 located on the center side in the thickness direction of the positive size model 10 is restrained.

Specifically, as shown in FIG. 8, positive heat 24 is applied (heated) to the node 22a of the solid element 22 located on one side of the front and back sides of the positive size model 10 in the mold clamping state of press molding. Then, by applying (cooling) negative heat 25 to the node 23a of the solid element 23 located on the other side of the front and back, a desired heat load is applied to a predetermined portion of the exact size model 10 and press molding is performed. It is possible to reproduce a predetermined stress distribution (factorial stress distribution) in the mold clamping state. For example, the solid element 22 located on one side of the front and back constitutes the inner surface 11b (see FIG. 6) of the vertical wall portion 11, and the solid element 23 located on the other side of the front and back constitutes the outer surface 11a of the vertical wall portion 11 (FIG. 6). By applying positive heat 24 to the node 22a of the solid element 22 and applying negative heat 25 to the node 23a of the solid element 23, the stress distribution shown in FIG. 6 is applied in the mold clamping state. (Factor stress distribution), that is, a factor stress distribution (front and back stress difference of the vertical wall portion 11) which is the first generation factor F1 of the first deformation mode M1 shown in FIG. 2B can be imparted. When the solid element 21 on the center side in the thickness direction is constrained, the above-mentioned factor stress distribution is applied with the node 21a of the solid element 21 also constrained. After applying the factor stress distribution in this way, the deformation of the exact size model 10 when the mold is changed from the mold-clamped state to the mold-opened state is analyzed.

The magnitude of the heat 24, 25 (heat load) applied at this time is, for example, the stress distribution when the heat load is applied to the analysis model having a shape obtained by further simplifying the regular size model 10 or the regular size model 10 in advance. And, it is possible to acquire the correlation with the heat load by analysis and set it based on the correlation.

(S5) Contribution degree specifying step In this step, the influence of the generating factors on each deformation mode, here, the number of generating factors contributing to each deformation mode, based on the deformation analysis result of the exact size model 10 obtained in the deformation analysis step S4. , And the contribution of each factor to each deformation mode. For example, in the deformation analysis step S4, when the factor stress distribution that becomes the generation factor F1 of the first deformation mode M1 shown in FIG. A first transformation mode M1 (primary transformation mode) occurs, and another transformation mode (eg, a secondary transformation mode such as the second transformation mode M2), and in some cases yet another transformation mode (eg, a third transformation mode). Deformation mode M3 and other tertiary deformation modes) may occur. In this case, the degree of contribution of the generation factors (for example, the first to fourth generation factors F1 to F4) of each deformation mode M1 to M3 is specified from the deformation amount of the exact size model 10 related to each deformation mode M1 to M3. Specifically, one deformation analysis result obtained by the analysis is decomposed into deformation amounts for each of the deformation modes M1 to M3, and the corresponding generation factors F1 to F4 are based on the magnitude of the decomposed deformation amount. Calculate the contribution.

Similarly, regarding the deformation analysis results when the factor stress distributions that are the factors F2 to F5 of the other deformation modes M2 to M4 are applied to the exact size model 10, the number of factors that cause the deformation modes that are found to occur, And its contribution. In this way, with respect to the deformation analysis results of the exact size model 10 obtained for all the generation factors, the number of generation factors that contributed to the deformation and the degree of contribution thereof are specified. For example, in the deformation analysis result for one deformation mode shown in FIG. 9, the contribution of the generation factor A is the highest, and the contribution of the generation factor B is relatively low. On the other hand, in the deformation analysis results for the other deformation modes shown in FIG. 10, it can be seen that the contribution of the generation factor B is the highest, followed by the contribution of the generation factor A. From this, it can be clearly understood that the factor that causes one deformation mode contributes as the factor that causes another deformation mode, and the degree of contribution thereof. Further, the number and types of generation factors contributing to each deformation mode (for example, 3 types in the deformation mode shown in FIG. 9 and 4 types in the deformation mode shown in FIG. 10) can be known at a glance. From the above, it becomes possible to elucidate (at least the tendency) of the deformation mechanism (at least the tendency) of the pressed parts according to the exact size model 10 at the time of press molding. Note that FIGS. 9 and 10 are merely exemplified as one of the methods for expressing the distribution of the degree of contribution based on the deformation analysis result, and the factors A to E and the factors F1 to F5 shown in FIG. 5 are illustrated. There is no direct relationship with.

(S6) Contribution reflection step (redesign step)
In this step, the influence of each generation factor (contribution degree in this case) on each deformation mode obtained by the above steps S1 to S5 is reflected in the exact size model 10 to design (redesign) the pressed part. .. Specifically, since the contribution of the factors that cause each deformation mode is known, the exact size model 10 is supported so that the factor stress distribution that causes each factor becomes as small as possible according to the contribution. Change the shape of the part. Specific examples of the shape change include addition of a seat surface and addition of a bead according to the deformation mode. Alternatively, increasing the plate thickness (including superimposing plate-shaped portions) for the purpose of improving rigidity can be mentioned.

Further, when a plurality of generation factors influence each other's corresponding deformation modes, it is preferable to carry out individual design changes according to the degree of contribution of each generation factor to the deformation mode. This makes it possible to offset the deformation and prevent the product (pressed parts) after press molding from being deformed.

As described above, in the method for analyzing the deformation factors of the pressed parts according to the present embodiment, a plurality of deformation modes (for example, the first to fourth deformation modes M1 to M4 shown in FIG. 4) that may occur in the pressed parts by press molding are used. Factor stress distributions that are the factors that cause each deformation mode (for example, the first to sixth factors F1 to F5 shown in FIG. 5) are set for each deformation mode, and these factor stress distributions are independently set as an exact size model of the pressed part. Deformation analysis of the exact size model 10 when assigned to 10 is performed, and the number of generation factors contributing to each deformation mode and the degree of contribution of each generation factor to each deformation mode are specified based on the deformation analysis result. I made it. In this way, by assigning the factor stress distribution that causes each deformation mode and analyzing the deformation analysis result of the exact size model 10 at that time, the factor that causes one deformation mode is the other deformation mode. It is possible to objectively evaluate the effect (contribution) on the factors that cause it. Therefore, by performing the above-mentioned deformation analysis for all parts and all types of deformation modes of the exact size model 10 of the pressed parts, the deformation factors of the entire pressed parts are systematically identified, organized and grasped (visualized). ) (See FIGS. 9 and 10). This makes it possible to take appropriate measures for each part type. In addition, since the contribution rate of each generation factor is clarified for each deformation mode, it is possible to easily take measures according to each deformation mode. In addition, if the deformation factors that cause dimensional accuracy defects can be clarified at the product drawing stage, for example, the correct size model 10 will be redesigned by incorporating in advance the countermeasure effect of dimensional accuracy defects and the risk of secondary defects. Therefore, it is possible to improve the degree of completion of the drawing in a short period of time. Therefore, it is possible to design the stamped parts at low cost. Of course, if the deformation factor at the time of press molding is clarified, it is possible to easily apply the measures based on the above-mentioned analysis results to similar parts even if the parts type is changed.

Further, in the present embodiment, the factor stress distribution is applied to the exact size model 10 by heat in the mold restraint state (mold tightening state) of press molding. In this type of stress analysis, the stress distribution is generally applied by displacement or normal load, but in the case of displacement or normal load, it is necessary to specify orientation information in addition to magnitude. Therefore, there is a problem that the amount of calculation becomes enormous. On the other hand, in the present embodiment, the factor stress distribution caused by the press load, not the heat, is intentionally applied by heat in the analysis. As a result, since it is sufficient to specify only the magnitude of heat, the amount of calculation can be significantly reduced as compared with the conventional case. Therefore, the analysis time can be shortened.

In addition, since these factor stress distributions correspond to the deformation mode, which is a simple deformation, high reproduction accuracy can be obtained even when the factor stress distribution is reproduced by applying a thermal load, which makes it accurate. It becomes possible to perform analysis. Of course, since the pressed parts are formed in a thin-walled shape such as a plate, it is easy to apply positive and negative heat to the front and back surfaces to reproduce a predetermined stress distribution.

Further, in the present embodiment, the exact size model 10 as an analysis model is formed by a solid model having a plurality of solid elements 21 to 23 in the thickness direction thereof, and a specific solid element (here, a solid on the surface side in the thickness direction) is formed. By applying a thermal load to the elements 22 and 23), the factor stress distributions that are the factors F1 to F5 that generate the deformation modes M1 to M4 are reproduced. Normally, in stress analysis of plate-shaped parts such as panel-shaped parts, it is common to use an analysis model in which one solid element such as a shell element is used in the thickness direction in order to shorten the calculation time. By creating the exact size model 10 with a solid model having a plurality of solid elements in the thickness direction as in the embodiment, it is possible to reproduce an accurate stress distribution in the thickness direction. Of course, in the present embodiment, since the stress distribution is substituted by the thermal load and applied to the exact size model 10, it is possible to perform accurate deformation analysis while suppressing the calculation time.

Although one embodiment of the present invention has been described above, the method for analyzing the deformation factor of the pressed part and the method for designing the pressed part according to the present invention can adopt a configuration other than the above as long as the purpose is not deviated. be.

For example, in the above embodiment, as an evaluation step, the influence of the generating factors on each deformation mode is evaluated by specifying the number of generating factors contributing to each deformation mode and the contribution degree of each generating factor to each deformation mode. I have explained the case, but of course it is not limited to this. It is also possible to adopt other evaluation items as long as the influence of the generating factor on each deformation mode can be evaluated in some form.

Further, in the above embodiment, the case where a pressed part having a cross-sectional hat shape is targeted for analysis has been described (see FIG. 2 and the like), but of course, for a pressed part having a form other than the cross-sectional hat shape. It is also possible to apply the present invention. That is, it is possible to apply the deformation factor analysis method according to the present invention and the design method using the analysis result to the press parts having any shape as long as press molding is possible. Further, in this case, it is possible to set a plurality of deformation modes according to the shape of the pressed part and set the factor stress distribution that causes the occurrence thereof.

Further, in the above embodiment, in the deformation analysis step S4, a case where a factor stress distribution that causes each deformation mode is applied by heat (heat load) to the exact size model 10 of the pressed part is illustrated. As long as time permits, the factor stress distribution may be given to the positive size model 10 by other items (displacement, load, initial stress, etc.).

1a to 1c Pressed material 2, 3 Press mold 10 Correct size model of pressed parts 11 Vertical wall part 11c Neutral shaft 12 Upper wall part 13 First corner part 14 Flange part 15 Second corner part 21 to 23 Solid elements 21a to 23a Nodes F1-F5, A to E Generation factors M1 to M4 Deformation mode S1 Full size model creation step S2 Deformation mode setting step S3 Factor stress setting step S4 Deformation analysis step S5 Contribution degree identification step (evaluation step)
S6 Contribution reflection step (redesign step)

Claims (2)

It is a method of analyzing deformation factors of pressed parts obtained by press molding.
The step of creating an exact size model for creating an exact size model of the pressed part, and
A deformation mode setting step for setting a plurality of deformation modes that may occur in the pressed part by the press molding, and a deformation mode setting step.
The factor stress setting step for setting the factor stress that causes the occurrence of each deformation mode for each deformation mode, and
A deformation analysis step for performing deformation analysis of the exact size model when the factor stress is independently applied to the exact size model, and
Based on the deformation analysis result obtained in the deformation analysis step, an evaluation step for evaluating the influence of the generation factor on each deformation mode is further provided .
In the evaluation step, as the influence of the generation factor on each deformation mode, the number of the generation factors contributing to each deformation mode and the degree of contribution of each generation factor to each deformation mode are specified. Deformation factor analysis method. A method for designing a pressed part, wherein the pressed part is designed by reflecting the deformation analysis result obtained by the deformation factor analysis method according to claim 1 in the exact size model.

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