JP2023092415A - Press molding analysis method, press molding analysis device, and press molding analysis program - Google Patents

Abstract

To provide a press molding analysis method, a press molding analysis device, and a press molding analysis program which can predict, when performing press molding of a blank collected from a metal plate having a shape variation, influence of the shape variation of the blank.SOLUTION: A press molding analysis method comprises: an actual press molding product shape formation step S1 which forms, based on measurement data that measures a shape after demolding an actual press molding product that is actual press molded with a prescribed metal mold by use of an actual blank 3 cut off from a metal plate having a shape variation, an actual press molding product shape 5 having the same shape as the actual press molding product; a flatness blank press molding product shape acquisition step S3 in which a press molding analysis of the same metal mold model as a prescribed metal mold is performed based on a flatness blank model 7 so that a press molding product shape after demolding is acquired as a flatness blank press molding product shape 9; and a deviation quantity acquisition step S5 which compares the actual press molding product shape 5 with the flatness blank press molding product shape 9 to obtain a portion deviated between the shapes, and deviation quantity therebetween.SELECTED DRAWING: Figure 1

Description

The present invention relates to a press-forming analysis method, a press-forming analysis apparatus, and a press-forming analysis program for estimating the influence of shape variation of a blank taken from a metal plate having shape variation, when the blank is press-formed.

With the tightening of automobile collision safety standards, the collision safety of automobile bodies is progressing, and in response to the recent carbon dioxide emission regulations, it is necessary to reduce the weight of automobile bodies in order to improve fuel efficiency. ing. In order to achieve both collision safety performance and weight reduction of the vehicle body, a metal plate with higher strength than before is being adopted for the vehicle body.

Conventionally, an actual metal plate from which a blank for obtaining a press-formed product is taken does not have a completely flat plate, but has a corrugated shape (variation in shape).
Therefore, the actual blank taken from the metal plate is also not necessarily flat and may have shape variations.

When such a corrugated metal plate is used as a blank and press-formed into a vehicle body part, the press-formed product obtained after press-forming may deviate from the target dimensional accuracy due to the influence of the shape variation. feared.

Techniques for selecting press-formed products that are far from the target dimensional accuracy are disclosed in, for example, Patent Documents 1 and 2.

JP-A-62-047504 JP 2019-002834 A

The technique disclosed in Patent Document 1 or Patent Document 2 compares the shapes of press-formed products with each other, and measures the influence of the shape variation of the blank before press-forming on the press-formed product after press-forming. Not predictable.
Conventionally, it has not been possible to predict the effect of blank shape variation on the shape of a press-formed product, and it is necessary to specify which parts of a press-formed product are susceptible to blank shape variation. was not done.

The present invention has been made to solve such problems. An object of the present invention is to provide a forming analysis device and a press forming analysis program.

(1) A press forming analysis method according to the present invention is a method for predicting the influence of shape variation of a blank obtained from a metal plate with shape variation when press forming is performed,
The same shape as the actual press-formed product based on the measurement data obtained by measuring the shape after release of the actual press-formed product press-molded with a predetermined mold using the actual blank sampled from the metal plate having the shape variation. an actual press-formed product shape generation step for generating an actual press-formed product shape of
Using a flat blank model with a flat shape, press molding analysis is performed when press molding is performed with a mold model of the same shape as the predetermined mold, and the shape of the press molded product after mold release is defined as the shape of the flat blank press molded product. obtaining a flat blank press-form shape obtaining step;
The method is characterized by comprising a deviation amount acquisition step of comparing the shape of the flat blank press-formed product and the shape of the actual press-formed product, and obtaining the part where the two shapes diverge and the amount of deviation.

(2) Further, in the device described in (1) above, the divergence amount acquisition step includes:
Based on the molding bottom dead center shape in the press molding analysis using the flat blank model, the difference between the actual press molded product shape corresponding to the predetermined position of the molding bottom dead center shape, and the molding bottom dead center The difference between the shape and the shape of the flat blank press-molded product corresponding to the predetermined position of the shape is obtained as the divergence amount.

(3) In addition, in the device described in (1) above, the divergence amount acquisition step includes:
Obtained based on the molding surface shape of the mold model, the difference from the actual press-molded product shape corresponding to the predetermined position of the molding surface shape, and the flat blank press molding corresponding to the predetermined position of the molding surface shape It is characterized in that the difference between the product shape and the product shape is obtained as the divergence amount.

(4) In addition, in any one of (1) to (3) above, it further comprises a step of identifying a portion requiring countermeasure as a portion where the amount of deviation exceeds a preset threshold value. It is characterized by

(5) In addition, the press forming analysis device according to the present invention predicts the influence of shape variation of the blank when press forming is performed using a blank taken from a metal plate with shape variation,
The same shape as the actual press-formed product based on the measurement data obtained by measuring the shape after release of the actual press-formed product press-molded with a predetermined mold using the actual blank sampled from the metal plate having the shape variation. an actual press-formed product shape generation unit that generates an actual press-formed product shape of
Using a flat blank model with a flat shape, press molding analysis is performed when press molding is performed with a mold model of the same shape as the predetermined mold, and the shape of the press molded product after mold release is defined as the shape of the flat blank press molded product. a flat blank press molded product shape acquisition unit to acquire;
The flat blank press-formed product shape and the actual press-formed product shape are compared, and a divergence amount acquisition unit for obtaining a divergence portion and a divergence amount is provided.

(6) In addition, in the device described in (5) above, the divergence amount acquisition unit
Based on the molding bottom dead center shape in the press molding analysis using the flat blank model, the difference between the actual press molded product shape corresponding to the predetermined position of the molding bottom dead center shape, and the molding bottom dead center The difference between the shape and the shape of the flat blank press-molded product corresponding to the predetermined position of the shape is obtained as the divergence amount.

(7) In addition, in the device described in (5) above, the divergence amount acquisition unit
Obtained based on the molding surface shape of the mold model, the difference from the actual press-molded product shape corresponding to the predetermined position of the molding surface shape, and the flat blank press molding corresponding to the predetermined position of the molding surface shape It is characterized in that the difference between the product shape and the product shape is obtained as the divergence amount.

(8) In addition, in any one of the above (5) to (7), there is further provided an action required portion identification unit that identifies a portion where the amount of deviation exceeds a preset threshold value as an action required portion. It is characterized by

(9) Further, a press-forming analysis program according to the present invention is characterized by causing a computer to function as the press-forming analysis apparatus according to any one of (5) to (8) above.

According to the present invention, it is possible to know the influence of the shape change in the blank on the shape of the press-formed product after springback, that is, the portion having a large influence and the amount of divergence caused by the shape change.
Also, the quality of the press-formed product can be determined based on the amount of deviation and the predetermined threshold value, and the quality of the blank can be predicted based on this. As a result, it is possible to grasp the limit of the shape accuracy of the blank within the shape accuracy required for the press-formed product, and by selecting a blank having an appropriate shape, stable press-forming becomes possible.
In addition, if a shape defect occurs in a press-formed product, it will be possible to identify the part of the blank that caused the shape defect before press-forming. also connected.

FIG. 4 is an explanatory diagram of each step of the press forming analysis method according to Embodiment 1; 1 is an external view of a component targeted in Embodiment 1. FIG. FIG. 3A is an explanatory diagram of an actual blank having an uneven shape used in Embodiment 1, FIG. It is a graph of the amount of unevenness when viewed from the arrow AA in the cross section indicated by the dashed line in a). It is a figure which shows the difference amount of an actual press-formed product shape and a press-formed bottom dead center shape. FIG. 2 is an explanatory diagram of a flat blank model used in Embodiment 1; It is a figure which shows the amount of difference between a flat blank press-formed article shape and press-forming bottom dead center shape. FIG. 5 is a diagram showing a divergence amount, which is a difference between a difference between an actual press-formed product shape and a formed bottom dead center shape, and a difference between a flat blank press-formed product shape and a formed bottom dead center shape. FIG. 6 is an explanatory diagram of a press forming analysis device according to Embodiment 2; Based on the difference amount (a) between the flat blank press-formed product shape and the formed bottom dead center shape analyzed by press forming using a flat blank model in the example, and the shape of the actual press-formed product press-formed using the actual blank FIG. 7 is an explanatory diagram of a difference amount (b) between the generated actual press-formed product shape and the formed bottom dead center shape; FIG. 10 is a diagram showing the divergence amount, which is the difference between the difference between the actual press-formed product shape and the formed bottom dead center shape, and the difference between the flat blank press-formed product shape and the formed bottom dead center shape in the example.

[Embodiment 1]
The press forming analysis method according to the present embodiment predicts the influence of blank shape change when press forming (form forming, draw forming, etc.) is performed using a blank taken from a metal plate with shape change (unevenness). The press forming analysis method, as shown in FIG. 1, includes an actual press-formed product shape generation step S1, a flat blank press-formed product shape acquisition step S3, and a divergence amount acquisition step S5.
Hereinafter, each configuration will be described in detail, taking as an example a case where the press-formed product 1 shown in FIG. 2 is press-formed with a target shape. In this embodiment, a blank made of a 1.2 mm-thick 1.5 GPa grade steel plate is used, but this is not the only option.

<Actual press molded product shape generation step>
An actual press-formed product shape generation step S1 generates an actual press-formed product shape having the same shape as the actual press-formed product, based on the actual press-formed product press-formed using an actual blank taken from a metal plate with shape variation. It is a step to

First, a real blank sampled from a metal plate with shape variation will be described. As an example, FIG. 3 shows an actual blank 3 sheared from a 1.5 GPa class steel plate having a thickness of 1.2 mm with shape variation.
FIG. 3(a) shows the shape of the actual blank 3 measured and the unevenness represented by color densities. FIG. 3(b) is a graph showing the amount of unevenness when the cross section indicated by the dashed line in FIG.
As shown in FIG. 3(b), the actual blank 3 has an irregular concave-convex shape with a maximum concave-convex amount of ±1.3 mm.

In the actual press-formed product shape generation step S1, the actual press-formed product shape having the same shape as that of the actual press-formed product press-formed using the actual blank 3 is generated.
For example, the actual blank 3 in FIG. 3 is press-molded using a predetermined mold, and the shape of the actual press-molded product obtained by this is measured using a three-dimensional shape measuring instrument such as a laser rangefinder. Then, the shape of the actual press-formed product is generated based on the measured data.
The molding of the actual press-molded product may be either form molding or draw molding. In the present embodiment, draw molding will be described as an example, and in the later-described examples, foam molding will be described as an example.

In the above description, a series of steps of press molding of the actual blank 3, measurement of the actual press-formed product, and generation of the shape of the actual press-formed product are performed.
When the actual press-formed product is prepared in advance, the shape of the actual press-formed product may be measured to generate the shape of the actual press-formed product. When data obtained by measuring the shape of is prepared in advance, the shape of the actual press-formed product may be generated based on the data.

FIG. 4 shows the actual press-formed product shape 5 generated as described above. In FIG. 4, in addition to the shape, the amount of difference from the molded bottom dead center shape when press-molding with a mold model is indicated by color shading. The forming bottom dead center shape can be obtained by modeling the actual blank 3 and performing press forming analysis.
A mold model is a model of a mold used for molding an actual press-formed product, and is a model generated so as to have the same shape as the molding surface of the actual mold (not shown).
And the amount of difference from the molding bottom dead center shape is a value obtained by subtracting the height of the corresponding part of the molding bottom dead center shape from the height of each part of the actual press-formed product shape in the press forming direction, This is the amount of springback in the direction of press forming.
If the height difference (difference amount) is + (plus), it will be convex from the molding bottom dead center shape, and if the height difference (difference amount) is - (minus), it will be concave from the molding bottom dead center shape. becomes.

In FIG. 4, the color of the recessed portion is lighter than the molding bottom dead center shape, and the color of the convex portion is darker. In the figures shown in the figure, + is the amount of difference in the convex direction, and - is the amount of difference in the concave direction, and the unit is mm.
In this example, as shown in FIG. 4, the difference amount at the left end of the flange portion of the actual press-formed product shape 5 is 6.2 mm, the top plate portion of the curved portion is -4.4 mm, and the center portion in the longitudinal direction is -4.4 mm. was 4.1 mm at the vertical wall, 2.9 mm at the flange, and -3.9 mm at the flange near the right end.

<Flat blank press molded product shape acquisition step>
The flat blank press-formed product shape acquisition step S3 uses a flat blank model (hereinafter referred to as "flat blank model 7") as shown in FIG. This is the step of analyzing and acquiring the shape of the press-molded product after mold release as the shape of a flat blank press-molded product.

The flat blank model 7 is a blank model generally used in press forming analysis, and has a flat shape without irregularities.

For press forming analysis, CAE analysis such as finite element method (FEM) is usually performed. Since the actual press-formed product of the present embodiment is draw-formed as described above, press-forming analysis is also performed as draw-forming in CAE analysis.

FIG. 6 shows the flat blank press-formed product shape 9 after release from the press-forming analysis. The colors and numerical values shown in FIG. 6 indicate the amount of difference from the molding bottom dead center shape, as in FIG. Even if the flat blank model 7 is press-formed and analyzed instead of the modeled actual blank 3, the mold model is the same, and the shape of the bottom dead center of the forming is the same, so that comparison is possible.
As shown in Fig. 6, the difference amount of the left end of the flange portion of the flat blank press-formed product shape 9 is 5.1 mm, the top plate portion of the curved portion is -3.6 mm, and the central portion in the longitudinal direction is the vertical wall 2.7 mm at the edge, 2.1 mm at the flange, and -1.6 mm at the flange near the right end.

<Deviation amount acquisition step>
The divergence amount acquisition step S5 is a step for comparing the actual press-formed product shape 5 and the flat blank press-formed product shape 9, and obtaining the part where the two shapes diverge and the divergence amount.

In the present embodiment, the amount of difference (springback amount) between the shape of the actual press-formed product 5 and the shape of the flat blank press-formed product 9 from the bottom dead center shape at each part is obtained and compared, and the difference between these differences is calculated. It was obtained as the amount of deviation.
That is, the deviation amount is a flat blank press-formed product obtained by press-forming analysis using a flat blank model from the amount of difference between the actual press-formed product shape 5 generated based on the actual press-formed product and the formed bottom dead center shape. It is a value obtained by subtracting the amount of difference between the shape 9 and the shape of the bottom dead center of molding. Therefore, when the difference in the amount of difference (divergence) is + (plus), the corresponding portion of the actual press-formed product shape 5 becomes a convex shape compared to the flat blank press-formed product shape 9, and the difference in the amount of difference (divergence amount) is - (minus), the corresponding portion of the actual press-formed product shape 5 is recessed compared to the flat blank press-formed product shape 9 .

FIG. 7A shows the amount of deviation obtained by comparing the actual press-formed product shape 5 and the flat blank press-formed product shape 9 . In the figure, the amount of + (plus) deviation is surrounded by a solid line, and the amount of - (minus) deviation is surrounded by a broken line. Also, Max indicates the maximum value of the amount of divergence in the convex direction, and Min indicates the maximum value (minimum numerical value) of the amount of divergence in the concave direction. This point is the same in FIG. 10 as well.
As shown in FIG. 7(a), the greatest divergence in the convex direction was observed in the central vertical wall portion, and the greatest divergence in the concave direction was observed in the flange portion near the right end. Therefore, the shape variation of the actual blank 3 greatly affects these parts.

In order to confirm the correspondence between the amount of deviation of each part described above and the uneven shape of the actual blank 3, a diagram similar to FIG. 3(a) is shown in FIG. 7(b).
In the present embodiment, when confirming the part of the actual blank 3 before press forming corresponding to the part where the deviation amount is + (plus) in FIG. 7A, all of them have a convex shape. can be seen (see the solid line circle). From this, it can be predicted that the convex shape of the relevant portion of the actual blank 3 affects the divergence in the convex direction of the actual press-formed product shape 5 .
Similarly, with respect to the portion where the amount of deviation is - (minus) in FIG. I understand (see dashed circle). From this, it can be predicted that the concave shape of the relevant portion of the actual blank 3 affects the divergence of the actual press-formed product shape 5 in the concave direction.

As described above, when the shape of the actual blank 3 before press molding is measured in advance, the measured data is accumulated, and displayed on a computer screen such as a PC (personal computer), the actual press molded product shape 5 It is preferable because it is easy to compare with.

In addition, since the shape variation of the actual blank 3 has a complicated effect according to the shape of the press-formed product, there is not necessarily a difference between the deviation amount in the actual press-formed product shape 5 and the uneven shape in the actual blank 3 as in this embodiment. correspondence relationship does not necessarily appear.

According to the present embodiment, it is possible to know the influence of shape variation in the blank on the shape of the press-formed product after springback, that is, the amount of divergence caused by the portion having a large influence and the shape variation.
Also, the quality of the press-formed product can be determined based on the amount of deviation and the predetermined threshold value, and the quality of the blank can be predicted based on this.
For example, when a plurality of press-formed products are superimposed and joined to assemble members of a vehicle body, it is difficult to join the press-formed products together if the deviation amount of the flange portion is particularly large.
Therefore, a predetermined threshold value is set for the amount of deviation, and blanks that become press-formed products with the amount of deviation exceeding the threshold value are greatly affected by shape variation, and are judged to be unusable blanks, making it possible to predict the quality of the blank. As a result, it is possible to grasp the limit of the shape accuracy of the blank within the shape accuracy required for the press-formed product, and by selecting a blank having an appropriate shape, stable press-forming becomes possible.
In addition, if a shape defect occurs in a press-formed product, it will be possible to identify the part of the blank that caused the shape defect before press-forming. also connected.

In addition, by further providing a portion requiring countermeasure identification step for identifying a portion where the maximum value of deviation exceeds a preset threshold value as a portion requiring countermeasure, countermeasures based on the shape of the mold when using a blank with shape variation It is possible to specify the part to take countermeasures by changing the shape of the molded product.
For example, in FIG. 7, if the deviation threshold of the actual press-formed product shape 5 is set to ±1.5 mm, only the right end of the actual press-formed product shape 5 may be corrected to be within the threshold. Countermeasures such as correcting part of the mold of the part can be taken.

The amount of deviation obtained from the difference in blank shape is directly in the press-forming direction from the height of each part of the actual press-formed product shape 5 when the blank has unevenness after press-forming when the blank is flat. A difference obtained by subtracting the height of each part of the flat blank press-formed product shape 9 after molding and springback may be applied.
However, in order to compare the shapes of press-formed products with different blanks, it is necessary to set a common fixing point for each press-formed product. Sometimes.
In this respect, it is preferable to compare the amount of difference from the forming bottom dead center shape as in the above embodiment, because the amount of divergence can be obtained based on a stable reference.
Also, instead of the above-described press-molding bottom dead center shape, comparing the amount of difference with the molding surface shape of the mold model to determine the amount of divergence is also preferable because it is based on a stable standard.

[Embodiment 2]
The press forming analysis method described in Embodiment 1 can be realized by causing a computer to execute a preset program. A press forming analysis device, which is an example of such a device, will be described in the present embodiment.
As shown in FIG. 8, the press forming analysis apparatus 11 according to the present embodiment is configured by a computer such as a PC (personal computer), and includes a display device 13, an input device 15, a storage device 17, a work data memory 19 and It has an arithmetic processing unit 21 .
The display device 13, the input device 15, the storage device 17, and the work data memory 19 are connected to the arithmetic processing section 21, and their respective functions are executed by commands from the arithmetic processing section 21. FIG.
Hereinafter, each configuration of the press-forming analysis apparatus 11 according to the present embodiment will be described with the press-formed product 1 shown in FIG. 2 as the object of analysis.

≪Display device≫
The display device 13 is used for displaying analysis results, etc., and is composed of a liquid crystal monitor or the like.

≪Input device≫
The input device 15 is used for displaying instructions for blanks, press-molded products, etc., for inputting conditions by an operator, etc., and is composed of a keyboard, a mouse, and the like.

≪Storage device≫
The storage device 17 is used to store various files such as the shape file 29 for blanks and press-molded products, and is composed of a hard disk or the like.

≪Work data memory≫
The working data memory 19 is used for temporary storage of data used by the arithmetic processing unit 21 and for arithmetic operations, and is composed of a RAM (Random Access Memory) or the like.

≪Arithmetic processing section≫
As shown in FIG. 8, the arithmetic processing unit 21 includes an actual press-formed product shape generation unit 23, a flat blank press-formed product shape acquisition unit 25, and a divergence amount acquisition unit 27. device).
Moreover, you may have a countermeasure required site|part specific part further.
Each of these units functions when the CPU executes a predetermined program.
Functions of the above-described units in the arithmetic processing unit 21 will be described below.

The actual press-formed product shape generation unit 23 executes the actual press-formed product shape generation step S1 described in the first embodiment. Similarly, the flat blank press-formed product shape acquisition unit 25 performs the flat blank press-formed product shape acquisition step S3, the deviation amount acquisition unit 27 performs the deviation amount acquisition step S5, the action required part identification unit performs the action required part identification step, Execute each.

According to the press-forming analysis apparatus 11 according to the present embodiment, as in the first embodiment, the influence of the shape variation in the blank on the shape of the press-formed product, that is, the part with a large influence and the amount of divergence due to the shape variation can know
Also, the quality of the press-formed product can be determined based on the amount of deviation and the predetermined threshold value, and the quality of the blank can be predicted based on this.
In addition, by providing an area requiring countermeasure identification unit that identifies areas where the amount of deviation exceeds a preset threshold as areas requiring countermeasures, when blanks with shape variations are used, countermeasures based on the shape of the mold and the shape of the molded product can be obtained. It is possible to specify the part to take countermeasures by changing the

As described above, the actual press-formed product shape generation unit 23, the flat blank press-formed product shape acquisition unit 25, the divergence amount acquisition unit 27, and the countermeasure required part identification unit in the press forming analysis apparatus 11 of the present embodiment are , the CPU executes a predetermined program.
Therefore, if the invention is composed mainly of a program, the press-forming analysis program according to the present invention comprises a computer, an actual press-formed product shape generation unit, a flat blank press-formed product shape acquisition unit, a deviation amount acquisition unit, and a countermeasure required It can be specified that it functions as a part specifying part.

In order to confirm the effects of the present invention, the press molding analysis method described in Embodiment 1 was performed in place of form molding instead of draw molding, and will be described below with reference to FIGS. Also, a blank made of a 1.5 GPa grade steel plate having a thickness of 1.2 mm was used.
9 and 10 have the same meanings as those in the first embodiment.

FIG. 9 shows the shape of the press-formed product after release when the molding of the actual press-formed product and the forming by CAE analysis are form forming, and FIG. 9A shows the flat blank model 7 shown in FIG. FIG. 9B is an actual press-formed product press-formed using a blank having an uneven shape similar to the actual blank 3 having an uneven shape shown in FIG. It is.

In the case of flat blank press-formed product shape 9 obtained by press-forming analysis using a flat blank model, as shown in FIG. -3.6mm, the longitudinal central part was 2.7mm on the vertical wall, 2.1mm on the flange, and -1.6mm on the flange near the right end.
On the other hand, in the case of the actual press-formed product shape 5 generated based on the actual press-formed product, as shown in FIG. The thickness was -5.2 mm for the plate, 5.5 mm for the vertical wall, 3.5 mm for the flange, and -4.8 mm for the flange near the right end.

The amount of deviation obtained by comparing the flat blank press-formed product shape 9 in FIG. 9(a) and the actual press-formed product shape 5 in FIG. 10. As shown in FIG. 10, the right end portion of the actual press-formed product shape 5 has the largest divergence amount of -3.3 mm, and it can be seen that the concave shape of the actual blank 3 before forming corresponding to this portion has the greatest influence. .
Also, the amount of deviation is large at 2.8 mm in the central portion, and it can be seen that the convex shape of the actual blank 3 before press forming corresponding to this portion has a large effect.

In order to join the parts that make up the car body, we set a threshold of ±1.5 mm for the amount of deviation corresponding to the shape accuracy, and predicted the quality of press-formed products using actual blanks with uneven shapes.
As a result, it was possible to grasp at a glance that it was necessary to correct the shape of the right end portion, the center portion, and the top plate portion of the curved portion of the actual press-formed product shape 5 shown in FIG. By correcting the mold and press-molding, a press-molded product with a good shape can be manufactured.

1 Press-formed product (target shape)
3 Actual blank 5 Shape of actual press-formed product 7 Flat blank model 9 Shape of flat blank press-formed product 11 Press-forming analysis device 13 Display device 15 Input device 17 Storage device 19 Work data memory 21 Arithmetic processing unit 23 Actual press-formed product shape generation Section 25 Flat blank press-formed product shape acquisition section 27 Deviation amount acquisition section 29 Blank and press-formed product shape files

Claims (9)

A press forming analysis method for predicting the influence of shape variation of a blank when press forming is performed using a blank taken from a metal plate with shape variation,
The same shape as the actual press-formed product based on the measurement data obtained by measuring the shape after release of the actual press-formed product press-molded with a predetermined mold using the actual blank sampled from the metal plate having the shape variation. an actual press-formed product shape generation step of generating an actual press-formed product shape of
Using a flat blank model with a flat shape, press molding analysis is performed when press molding is performed with a mold model of the same shape as the predetermined mold, and the shape of the press molded product after mold release is defined as the shape of the flat blank press molded product. obtaining a flat blank press-form shape obtaining step;
A press-forming analysis method, comprising: comparing the shape of the flat blank press-formed product and the shape of the actual press-formed product, and obtaining a divergence amount and a portion where the two shapes diverge and the deviation amount. . The divergence amount acquisition step includes:
Based on the molding bottom dead center shape in the press molding analysis using the flat blank model, the difference between the actual press molded product shape corresponding to the predetermined position of the molding bottom dead center shape, and the molding bottom dead center 2. The press forming analysis method according to claim 1, wherein a difference between the shape and the shape of the flat blank press-formed product corresponding to the predetermined position is obtained as the divergence amount. The divergence amount acquisition step includes:
Obtained based on the molding surface shape of the mold model, the difference from the actual press-molded product shape corresponding to the predetermined position of the molding surface shape, and the flat blank press molding corresponding to the predetermined position of the molding surface shape 2. The press forming analysis method according to claim 1, wherein a difference from a product shape is obtained as the divergence amount. 4. The press forming analysis according to any one of claims 1 to 3, further comprising a step of identifying a portion where the amount of deviation exceeds a preset threshold value as a portion requiring countermeasures. Method. A press forming analysis apparatus for predicting the influence of shape variation of a blank obtained from a metal plate with shape variation when the blank is press-formed,
The same shape as the actual press-formed product based on the measurement data obtained by measuring the shape after release of the actual press-formed product press-molded with a predetermined mold using the actual blank sampled from the metal plate having the shape variation. an actual press-formed product shape generation unit that generates an actual press-formed product shape of
Using a flat blank model with a flat shape, press molding analysis is performed when press molding is performed with a mold model of the same shape as the predetermined mold, and the shape of the press molded product after mold release is defined as the shape of the flat blank press molded product. a flat blank press molded product shape acquisition unit to acquire;
A press-forming analysis device, comprising: a deviation amount acquisition unit that compares the shape of the flat blank press-formed product with the shape of the actual press-formed product, and obtains a portion where both shapes diverge and the amount of deviation. . The divergence amount acquisition unit
Based on the molding bottom dead center shape in the press molding analysis using the flat blank model, the difference between the actual press molded product shape corresponding to the predetermined position of the molding bottom dead center shape, and the molding bottom dead center 6. The press forming analysis apparatus according to claim 5, wherein a difference between the shape and the shape of the flat blank press-formed product corresponding to the predetermined position of the shape is obtained as the divergence amount. The divergence amount acquisition unit
Obtained based on the molding surface shape of the mold model, the difference from the actual press-molded product shape corresponding to the predetermined position of the molding surface shape, and the flat blank press molding corresponding to the predetermined position of the molding surface shape 6. The press-forming analysis apparatus according to claim 5, wherein a difference from a product shape is obtained as the divergence amount. 8. The press forming analysis according to any one of claims 5 to 7, further comprising a countermeasure-required portion identification unit that identifies a portion where the amount of deviation exceeds a preset threshold value as a countermeasure-required portion. Device. A press-forming analysis program that causes a computer to function as the press-forming analysis apparatus according to any one of claims 5 to 8.

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