JP2023103926A - Method, device and program for analyzing press molding - Google Patents

Abstract

To provide a method, a device and a program for analyzing press molding that predict impact from shape change of a blank.SOLUTION: A method for analyzing press molding includes: a reference press molding product shape acquisition step; a waveform blank model generation step of generating a waveform blank model 7; a waveform blank press molding product shape acquisition step of acquiring a waveform blank press molding product shape 9; a first deviation amount acquisition step of providing a deviation amount between the reference press molding product shape 5 and the waveform blank press molding product shape 9; a cycle misalignment waveform blank model generation step of generating a cycle misalignment waveform blank model 11; a cycle misalignment waveform blank press molding product shape acquisition step of acquiring a cycle misalignment waveform blank press molding product shape 13; a second deviation amount acquisition step of providing a deviation amount between the reference press molding product shape 5 and the cycle misalignment waveform blank press molding product shape 13; and a countermeasure necessary part identifying step of identifying a countermeasure necessary part.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.

As the collision safety standards for automobiles become stricter, the collision safety of automobile bodies progresses, and in response to the recent carbon dioxide emission regulations, it is necessary to reduce the weight of automobile bodies in order to improve the fuel efficiency of automobiles. there is 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.

For example, Patent Literatures 1 and 2 disclose techniques for sorting press-molded products that do not meet the target dimensional accuracy.

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.

A blank used for press molding is obtained by punching or shearing from a metal plate such as a steel plate. Due to the difference in the positions when the blanks are taken from the metal plate with shape variation, even if the blanks are taken from the same metal plate, the individual blanks have different portions exhibiting unevenness.
Therefore, in estimating the effect of blank shape variation on the shape of a press-formed product, it is necessary to take into consideration that there are differences in the shape variation of individual blanks.

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,
Using a flat blank model with a flat shape, press forming analysis is performed when press forming is performed with a predetermined mold model, and the shape of the press formed product after release from the mold is obtained as the reference press formed product shape. an acquisition step;
a wavy blank model generation step of generating a wavy blank model having a wavy shape with a predetermined wavelength and a predetermined amplitude corresponding to the shape variation;
A corrugated blank press for obtaining a press-formed product shape after mold release as a corrugated blank press-formed product shape by performing press-forming analysis when press-molding is performed with the predetermined mold model using the corrugated blank model. a molded product shape acquisition step;
a first divergence amount acquisition step of comparing the reference press-formed product shape and the wave-shaped blank press-formed product shape, and obtaining a divergence portion and the divergence amount between the two shapes;
a cycle-shifted wave-shaped blank model generation step of generating one or a plurality of types of a cycle-shifted wave-shaped blank model having a wave shape with the same amplitude as that of the wave-shaped blank model but with a shifted cycle;
Using the period-shifted wavy blank model, press-molding analysis is performed when press-molding is performed with the predetermined mold model, and the press-formed product shape after mold release is acquired as the period-shifted wavy blank press-formed product shape. a step of acquiring a shape of a period-shifted waveform blank press-formed product;
a second divergence amount acquisition step of comparing the reference press-formed product shape with one or more types of the period-shifted waveform blank press-formed product shapes, and obtaining a divergence portion and the divergence amount between the two shapes;
and a step of identifying a portion requiring countermeasure for identifying, as a portion requiring countermeasure, a portion having a deviation amount exceeding a threshold among the amounts of deviation obtained in the first step of obtaining the amount of deviation and the step of obtaining the second amount of divergence. It is characterized.

(2) Further, in the above (1), the first divergence amount acquisition step includes:
A difference between a springback amount of a predetermined portion of the reference press-formed product shape and a springback amount of the same portion as the predetermined portion of the reference press-formed product shape of the wavy blank press-formed product shape is obtained as the divergence amount. death,
The second divergence amount acquisition step includes:
The divergence amount is defined as the difference between the springback amount of a predetermined portion in the reference press-formed product shape and the springback amount of the same portion as the predetermined portion of the reference press-formed product shape in the period deviation waveform blank press-formed product shape. It is characterized by acquiring as

(3) In addition, a press forming analysis method according to the present invention is a method of predicting the influence of shape variation of a blank taken from a metal plate with shape variation and press forming using the blank,
Using a flat blank model with a flat shape, press forming analysis is performed when press forming is performed with a predetermined mold model, and the shape of the press formed product after release from the mold is obtained as the reference press formed product shape. an acquisition step;
a first actual blank model generation step of generating a first actual blank model based on measurement results obtained by measuring the shape of the first actual blank sampled from a predetermined position of the metal plate;
Using the first real blank model, press forming analysis is performed when press forming is performed with the predetermined mold model, and the shape of the press-formed product after mold release is obtained as the shape of the first real blank press-formed product. a first actual blank press-molded product shape acquisition step;
a first actual divergence amount acquiring step of comparing the reference press-formed product shape and the first actual blank press-formed product shape, and obtaining a deviation portion and a deviation amount between the two shapes;
Based on the measurement result of measuring the shape of one or more second real blanks taken from a position different from the first real blank on the metal plate, one type or a plurality of types of second real blank models a second real blank model generation step that generates
Using the second real blank model, press forming analysis is performed when press forming is performed with the predetermined mold model, and the shape of the press-formed product after mold release is acquired as the shape of the second real blank press-formed product. a second actual blank press-molded product shape acquisition step;
a second actual deviation amount acquiring step of comparing the reference press-formed product shape with one or more types of the second actual blank press-formed product shapes, and obtaining a deviation portion and a deviation amount between the two shapes;
and a countermeasure-required part identification step of identifying a part where a deviation amount exceeding a threshold among the deviation amounts obtained in the first actual deviation amount obtaining step and the second actual divergence amount obtaining step is identified as a countermeasure-required part. It is characterized by

(4) In addition, in the method described in (3) above, the first actual divergence amount acquisition step includes:
The divergence amount is defined as the difference between the springback amount of a predetermined portion in the reference press-formed product shape and the springback amount of the same portion as the predetermined portion of the reference press-formed product shape in the first actual blank press-formed product shape. and get as
The second actual divergence amount acquisition step includes:
The divergence amount is defined as the difference between the springback amount of a predetermined portion in the reference press-formed product shape and the springback amount of the same portion as the predetermined portion of the reference press-formed product shape in the second actual blank press-formed product shape. It is characterized by acquiring as

(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,
Using a flat blank model with a flat shape, press forming analysis is performed when press forming is performed with a predetermined mold model, and the shape of the press formed product after release from the mold is obtained as the reference press formed product shape. an acquisition unit;
a wavy blank model generation unit that generates a wavy blank model having a wavy shape with a predetermined wavelength and a predetermined amplitude corresponding to the shape variation;
A corrugated blank press for obtaining a press-formed product shape after mold release as a corrugated blank press-formed product shape by performing press-forming analysis when press-molding is performed with the predetermined mold model using the corrugated blank model. a molded product shape acquisition unit;
a first divergence amount acquisition unit that compares the reference press-formed product shape and the wave-shaped blank press-formed product shape, and obtains a part where both shapes diverge and the amount of divergence;
a period-shifted wave-shaped blank model generation unit that generates one or a plurality of types of a cycle-shifted wave-shaped blank model having a wave shape having the same amplitude as the wave-shaped blank model in the wave-shaped blank model, but having a wave shape with a shifted period;
Using the period-shifted wavy blank model, press-molding analysis is performed when press-molding is performed with the predetermined mold model, and the press-formed product shape after mold release is acquired as the period-shifted wavy blank press-formed product shape. a period deviation waveform blank press-formed product shape acquisition unit;
a second divergence amount acquisition unit that compares the reference press-formed product shape with one or more types of the period-shift wave-shaped blank press-formed product shapes, and obtains a portion where the two shapes diverge and the amount of divergence;
and a countermeasure-required part identification unit that identifies a part where a deviation amount exceeding a threshold among the deviation amounts obtained by the first deviation amount acquisition part and the second deviation amount acquisition part occurs as a countermeasure-required part. It is characterized.

(6) Further, in the device described in (5) above, the first divergence amount acquiring unit
A difference between a springback amount of a predetermined portion of the reference press-formed product shape and a springback amount of the same portion as the predetermined portion of the reference press-formed product shape of the wavy blank press-formed product shape is obtained as the divergence amount. death,
The second divergence amount acquisition unit
The divergence amount is defined as the difference between the springback amount of a predetermined portion in the reference press-formed product shape and the springback amount of the same portion as the predetermined portion of the reference press-formed product shape in the period deviation waveform blank press-formed product shape. It is characterized by acquiring as

(7) 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,
Using a flat blank model with a flat shape, press forming analysis is performed when press forming is performed with a predetermined mold model, and the shape of the press formed product after release from the mold is obtained as the reference press formed product shape. an acquisition unit;
a first actual blank model generation unit that measures the shape of a first actual blank sampled from a predetermined position of the metal plate and generates a first actual blank model based on the measurement result;
Using the first real blank model, press forming analysis is performed when press forming is performed with the predetermined mold model, and the shape of the press-formed product after mold release is obtained as the shape of the first real blank press-formed product. a first actual blank press-formed product shape acquisition unit;
a first actual divergence amount acquisition unit that compares the reference press-formed product shape and the first actual blank press-formed product shape, and obtains a deviation portion and a deviation amount between the two shapes;
Measuring the shape of one or more second real blanks sampled from a position different from the first real blank on the metal plate, and based on the measurement results, one or more types of second real blank models a second real blank model generator that generates
Using the second real blank model, press forming analysis is performed when press forming is performed with the predetermined mold model, and the shape of the press-formed product after mold release is acquired as the shape of the second real blank press-formed product. a second actual blank press-formed product shape acquisition unit;
a second actual deviation amount acquisition unit that compares the reference press-formed product shape with one or more types of the second actual blank press-formed product shapes, and obtains a deviation portion and a deviation amount between the two shapes;
a countermeasure-required part identification unit for identifying a part where a deviation amount exceeding a threshold among the deviation amounts obtained by the first actual deviation amount acquisition part and the second actual deviation amount acquisition part is generated as a countermeasure-required part. It is characterized by

(8) In addition, in the device described in (7) above, the first actual divergence amount acquiring unit
The divergence amount is defined as the difference between the springback amount of a predetermined portion in the reference press-formed product shape and the springback amount of the same portion as the predetermined portion of the reference press-formed product shape in the first actual blank press-formed product shape. and get as
The second actual divergence amount acquisition unit,
The divergence amount is defined as the difference between the springback amount of a predetermined portion in the reference press-formed product shape and the springback amount of the same portion as the predetermined portion of the reference press-formed product shape in the second actual blank press-formed product shape. It is characterized by acquiring as

(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, in consideration of the difference in shape variation among individual blanks, the portion where the shape variation of the blank greatly affects the shape of the press-formed product after springback and the amount of divergence due to the shape variation of the blank are determined. 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. 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, it is possible to stably press-form a good shape.
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. 2 is an explanatory diagram of a flat blank model used in Embodiment 1; FIG. 4(a) is an explanatory diagram of the standard press-formed product shape obtained by press-forming analysis using the flat blank model of FIG. 3, and FIG. 4(b) shows the amount of change in FIG. 1 is a diagram showing the FIG. 4 is an explanatory diagram of a wavy blank model having a periodic wavy shape; FIG. 6(a) is an explanatory diagram of the shape of a corrugated blank press-formed product obtained by press-molding analysis using the corrugated blank model of FIG. 5, and FIG. It is the figure shown corresponding to the model. 6. It is a figure explaining the deviation amount when comparing the reference|standard press-formed product shape of FIG. 4, and the wave-shaped blank press-formed product shape of FIG. FIG. 6 is an explanatory diagram of a period-shifted waveform blank model having a waveform having the same amplitude as the waveform in the waveform blank model of FIG. 5 but having a shifted period; FIG. 9(a) is an explanatory diagram of the shape of the off-cycle wavy blank press-formed product subjected to press forming analysis using the off-cycle wavy blank model of FIG. 8, and FIG. 9(b) is a change in FIG. 9(a). FIG. 11 shows the quantities corresponding to a flat blank model; FIG. 10 is a diagram for explaining the amount of divergence when comparing the reference press-formed product shape of FIG. 4 and the cycle-shifted waveform blank press-formed product shape of FIG. 9 ; FIG. 11 is a diagram showing the range of deviation amounts in FIGS. 7 and 10 in correspondence with a flat blank model; FIG. 5 is an explanatory diagram of another aspect of the press forming analysis method according to Embodiment 1; FIG. 6 is an explanatory diagram of a press forming analysis device according to Embodiment 2; FIG. 9 is an explanatory diagram of another aspect of the press forming analysis device according to Embodiment 2; FIG. 4 is an explanatory diagram of a period-shifted waveform blank model according to an example; FIG. 16(a) is an explanatory diagram of the shape of the off-cycle wavy blank press-formed product subjected to press forming analysis using the off-cycle wavy blank model of FIG. 15, and FIG. 16(b) is a change in FIG. 16(a) FIG. 11 shows the quantities corresponding to a flat blank model; FIG. 17 is a diagram for explaining the amount of divergence when comparing the standard press-formed product shape of FIG. 4 and the cycle-shifted wave-shaped blank press-formed product shape of FIG. 16 ; FIG. 18 is a diagram showing the range of deviation amounts in FIGS. 7 and 17 in correspondence with a flat blank model;

[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). A press forming analysis method, as shown in FIG. Acquisition step S7, cycle-shifted wave-shaped blank model generation step S9, cycle-shifted wave-shaped blank press-formed product shape acquisition step S11, second deviation amount acquisition step S13, and countermeasure required part identification step S15 there is
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 model of a 1.5 GPa grade steel plate with a thickness of 1.2 mm is used, but this is not the only option.

<Reference press-molded product shape acquisition step>
The reference press-formed product shape acquisition step S1 uses a flat blank model (hereinafter referred to as "flat blank model 3") as shown in FIG. This is the step of acquiring the subsequent press-formed product shape as the reference press-formed product shape.
Note that the "press forming analysis" in this description includes analysis for obtaining the shape at the bottom dead center of forming and analysis for obtaining the shape after releasing from the mold, that is, after springback (the same applies hereinafter).

The flat blank model 3 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. Forming by CAE analysis may be either form forming or draw forming, but in the present embodiment, the case of form forming will be described as an example.

FIG. 4(a) shows a reference press-formed product shape 5 after release from the press-forming analysis. In FIG. 4, in addition to the shape, the amount of change from the bottom dead center of molding is indicated by the shade of color.
The amount of change is the value obtained by subtracting the height of the part corresponding to the shape of the bottom dead point of the forming from the height of each part of the shape of the press-formed product after releasing the mold after press forming and springing back in the press forming direction. , which corresponds to the amount of springback in the press forming direction. If the height difference (variation) is + (plus), it will be convex from the molded bottom dead center shape, and if the height difference (variation) is - (minus), it will be concave from the molded bottom dead center shape. becomes.
In FIG. 4(a), the color of the recessed portion from the bottom dead center of the molding is lightened, and the color of the convex portion is darkened. In the figures shown in the figure, + indicates the amount of change in the convex direction, and - indicates the amount of change in the concave direction, and the unit is mm.

In this example, as shown in FIG. 4(a), the amount of change at the left end (portion A) of the reference press-formed product shape 5 is 4.4 mm, and the left end (portion B) of the top plate portion is - It was 0.9 mm, 1.5 mm at the longitudinal center (site C), 1.8-2.1 mm at the bottom (sites D and E), and -2.0 mm at the right end (site F).
In order to show the correspondence relationship between the blank shape before press forming and the amount of change after springback, FIG.

<Corrugated blank model generation step>
The wavy blank model generation step S3 is a step of generating a wavy blank model 7 (see FIG. 5A) having a shape corresponding to the shape variation of the metal plate, for example, the corrugated shape of unevenness. A specific shape will be described below.

The example shown in FIG. 5(a) is a blank model having a waveform with a predetermined wavelength and a predetermined amplitude. It has a convex shape and a shape in which the light-colored portion is recessed in the back of the paper.
FIG. 5(b) is a state in which FIG. 5(a) is viewed from the direction of the white arrow, and FIG. 5(c) is a partially enlarged view thereof. The example shown in FIG. 5 has a plate thickness of 1.2 mm, an amplitude of irregularities of 2.0 mm (±1.0 mm), and a wavelength of irregularities (see FIG. 5(d)) of 320 mm. Also, the start position and end position of the unevenness set in the blank need not be the edge of the blank. In addition, the uneven|corrugated part of the shape of Fig.5 (a) was emphasized in FIG.5(e).

The wavy blank model 7 generated in the wavy blank model generating step S3 is obtained by measuring the shape of an actual blank sampled from a predetermined position of a metal plate with shape variation by a three-dimensional shape measuring device such as a laser rangefinder. and may be generated based on measurement results (eg, using representative wavelengths and amplitudes for setting).

<Wave shaped blank press molded product shape acquisition step>
In step S5 for obtaining the shape of a corrugated blank press-formed product, the corrugated blank model 7 is used to perform press forming analysis when press forming is performed with the same predetermined mold model as in the step for obtaining the shape of a reference press-formed product in step S1. This is the step of obtaining the post-press-formed product shape as a wave-shaped blank press-formed product shape.
A corrugated blank press-formed product shape 9 is shown in FIG. 6(a). The colors and numerical values shown in FIG. 6(a) are the same as those in FIG. 4(a).

In this example, as shown in FIG. 6(a), the amount of change at the left end (portion A) of the corrugated blank press-formed product shape 9 is 5.2 mm, and the left end (portion B) of the top plate portion is , -1.0 mm, 2.3 mm at the longitudinal center (site C), 2.8-4.1 mm at the bottom (sites D, E), and -2.5 mm at the right end (site F).
FIG. 6(b) shows the amount of change in the parts A to F in the corrugated blank press-formed product shape 9 in correspondence with the corrugated blank model 7 (FIG. 5(e)) before the press forming analysis.

<Step of obtaining first divergence amount>
The first divergence amount acquisition step S7 compares the reference press-formed product shape 5 (FIG. 4(a)) and the wave-shaped blank press-formed product shape 9 (FIG. 6(a)), This is the step of obtaining the deviation amount.

In the present embodiment, the shape of the press-formed product at the bottom dead center of the forming is used as a reference shape, and the amount of change (springback amount) from the reference shape at each part of the press-formed product obtained by CAE analysis is obtained to obtain a flat blank. The difference in the amount of change due to the shape variation of the blank was obtained as the amount of divergence.
That is, the divergence amount obtained in the first divergence amount acquisition step S7 is obtained from the amount of change in the wave-shaped blank press-molded product shape 9 using a blank with shape variation ( FIG. 6 ), the reference press-molding using a flat blank It is a value obtained by subtracting the amount of change in product shape 5 (Fig. 4). Therefore, when the difference in the amount of change (the amount of divergence) is + (plus), the corresponding portion of the wave-shaped blank press-formed product shape 9 becomes a convex shape compared to the reference press-formed product shape 5, and the difference in the amount of change ( When the amount of divergence) is - (minus), the corresponding portion of the wave-shaped blank press-formed product shape 9 is recessed compared to the reference press-formed product shape 5 .

FIG. 7(a) and FIG. 7(b) show the relationship between the amount of divergence obtained as described above and the corrugated shape of the corrugated blank model 7. FIG. In the figure, Max indicates the maximum value of the convex shape, and Min indicates the maximum value (minimum numerical value) of the concave shape.
As shown in FIG. 7(a), the amount of divergence when using the corrugated blank model 7 is 0.8 mm at site A, −0.1 mm at site B, 0.8 mm at site C, 2.0 mm at site D, It was 1.0 mm at site E and 0.5 mm at site F.

7(a) and 7(b), it can be considered that the convex shape of the corrugated blank model 7 corresponding to the portion D, which diverges most in the convex direction, has an effect. Similarly, it is considered that the concave shape of the corrugated blank model 7 corresponding to the portion F that deviates the most in the concave direction has an effect.

In addition, the waveform blank press-formed product shape 9 for which the amount of deviation is obtained may be developed into a blank by inverse molding analysis to specify the portion of the waveform blank model 7 that affects the amount of deviation. This also applies to the second divergence amount acquisition step S13.

<Period deviation waveform blank model generation step>
The period-shifted waveform blank model generation step S9 generates a period-shifted waveform blank model 11 (example in FIG. reference). A specific shape will be described below.

The example shown in FIG. 8(a) is a blank model having a periodic waveform having a predetermined wavelength and a predetermined amplitude, and the shading in FIG. 8(a) expresses unevenness.
FIG. 8(b) is a state in which FIG. 8(a) is viewed from the direction of the white arrow, and FIG. 8(c) is a partially enlarged view thereof. The example shown in FIG. 8 has a plate thickness of 1.2 mm, and the amplitude and wavelength of the unevenness are the same as those of the corrugated blank model 7 of FIG. It is shifted rightward on the paper (see FIGS. 8(d) and 8(e)).

<Step for acquiring the shape of a blank press-formed product with a period deviation wave shape>
In step S11 for acquiring the shape of the press-formed blank with a period deviation, a press-forming analysis is performed when the press-molded product is press-formed with the same predetermined mold model as in the acquisition step S1 for the shape of the reference press-formed product using the period-shifted wave-shaped blank model 11. and acquiring the shape of the press-formed product after the release from the mold as the shape of the wave-shaped blank press-formed product with a period deviation.
FIG. 9(a) shows the off-cycle waveform blank press-formed product shape 13. As shown in FIG. The colors and numerical values shown in FIG. 9(a) are the same as those in FIGS. 4(a) and 6(a).

In this example, as shown in FIG. 9A, the amount of change at the left end (portion A) of the period-shifted wave-shaped blank press-formed product shape 13 is 3.7 mm, and the left end (portion B) of the top plate portion is 3.7 mm. ) was -1.3 mm, the longitudinal central portion (site C) was 2.0 mm, the lower bottom portions (sites D and E) were 2.0-2.5 mm, and the right end (site F) was 0.5 mm.
In FIG. 9(b), the amount of change in the portions A to F in the period-shifted wave-shaped blank press-formed product shape 13 corresponds to the period-shifted wave-shaped blank model 11 (FIG. 8(e)) before the press-forming analysis. show.

<Second Deviation Amount Acquisition Step>
The second divergence amount acquisition step S13 is a step of comparing the reference press-formed product shape 5 and the cycle-shift wave-shaped blank press-formed product shape 13, and obtaining the part where the two shapes diverge and the divergence amount. The method of obtaining the deviation amount is the same as the method described in the first deviation amount acquisition step S7, so the description is omitted.

Deviation amount when comparing the reference press-formed product shape 5 (FIG. 4(a)) and the cycle-shifted wave-shaped blank press-formed product shape 13 (FIG. 9(a)), and the unevenness of the cycle-shifted wave-shaped blank model 11 The corresponding shapes are shown in FIGS. 10(a) and 10(b). Note that the meanings of Max and Min in the figure are the same as in FIG.
As shown in FIG. 10( a ), the amount of divergence when using the period-shifted waveform blank model 11 is −0.7 mm at site A, −0.4 mm at site B, 0.5 mm at site C, and 0.5 mm at site D. 0.4 mm, 0.2 mm at site E, and 2.5 mm at site F.

10(a) and 10(b), it can be considered that the convex shape of the corresponding portion of the period-shifted wave-shaped blank model 11 influences the portion F that deviates most in the convex direction. . Similarly, it is conceivable that the concave shape of the corresponding portion of the period-shifted wave-shaped blank model 11 has an effect on the portion A, which deviates most in the concave direction.

<Steps for identifying areas requiring countermeasures>
The action-required portion identification step S15 is a step of identifying, as a countermeasure-required portion, a portion having a deviation amount exceeding a threshold among the deviation amounts obtained in the first deviation amount acquisition step S7 and the second deviation amount acquisition step S13. .

For example, when multiple press-formed products are superimposed and joined to assemble a vehicle body member, if the shape of the press-formed products (especially the flange portion) deviates greatly, joining the press-formed products becomes difficult. Countermeasures may be required. Therefore, in the present embodiment, a portion that is assumed to have a large deviation due to a blank with shape variation is specified as a portion that requires countermeasures, and countermeasures such as correcting a part of the mold are made possible.

Both the deviation amount obtained in the first deviation amount acquisition step S7 (see FIG. 7) and the deviation amount determined in the second deviation amount acquisition step S13 (see FIG. 10) are converted into a blank shape (illustrated on the flat blank model 3). FIG. 11 shows the correspondence.

For example, if the threshold value in the step S15 for specifying a portion requiring countermeasure is set to ±1.5 mm, the portions where the amount of divergence exceeds the threshold are the portion D (the amount of divergence obtained in the step S7 for obtaining the amount of divergence is 2.0 mm), the portion F (The divergence amount obtained in the second divergence amount acquisition step S13 is 2.5 mm). Therefore, it is possible to specify the parts D and F as parts requiring countermeasures, and take countermeasures such as correcting part of the metal mold for the corresponding parts.

As described above, according to the present embodiment, it is possible to know the portion where the shape change in the blank greatly affects the shape of the press-formed product after springback and the amount of divergence caused by the shape change. In addition, multiple patterns of blank models are generated assuming blanks with shape variations, and the amount of divergence in each case is obtained, so it is considered that there are differences in the shape variations of individual actual blanks. .
Then, it is possible to judge the quality of the press-formed product based on the magnitude of the divergence amount, and predict the quality of each blank.
In addition, it is possible to identify which part of the blank before press forming was the cause of the shape defect in the part where the amount of deviation is large (exceeds the threshold), so that countermeasures can be taken immediately, improving productivity. It also leads to
As a result, it is possible to grasp the limit of the shape accuracy of the blank that is within the shape accuracy required for the press-formed product. It is possible to stably perform press molding with a good shape.

In the above description, only one type of period-shifted waveform blank model is generated, but a plurality of types of period-shifted waveform blank models may be generated. In that case, it is preferable that the waveforms of the period-shifted waveform blank models are shifted in period from each other (the wavelength and amplitude are common to the period-shifted waveform blank model and all the period-shifted waveform blank models).
By increasing the number of blank model patterns assuming blanks with shape variations, differences in shape variations of individual actual blanks can be considered more specifically.

In the above description, the shape of the press-formed product when the blank is flat (reference press-formed product shape) and the shape of the press-formed product when the blank has unevenness (wavy blank press-formed product shape or period-shifted wave-shaped blank When comparing press-formed product shapes), the difference in the amount of change (springback amount) from the forming bottom dead center in the press-forming direction was used as the divergence amount, but the present invention is not limited to this.
For example, in the press molding direction, from the height of each part of the press-molded product shape after mold release (after springback) when the blank has unevenness, the height after mold release (after springback) when the blank is flat A difference obtained by subtracting the height of each part of the shape of the press-molded product may be used as the amount of divergence.
However, in this case, it is necessary to set a fixed point common to the two press-formed product shapes, and the amount of divergence may vary depending on how the fixed point is selected.
In this respect, as in the present embodiment, if the amounts of change are compared with each other based on the shape of the bottom dead center, which is constant regardless of the shape of the blank, the amount of divergence can be obtained accurately and easily. preferred.

In addition, in the above, a blank model having a periodic wave shape was generated as a model corresponding to a blank sampled from a metal plate with shape variation, but a blank model reflecting the irregular uneven shape of the actual blank was generated. You may For example, the shape of an actual blank taken from a metal plate with shape variation is measured by a three-dimensional shape measuring device such as a laser rangefinder, and the measurement data is used to determine the shape corresponding to the actual irregular uneven shape. A real blank model may be generated.

As shown in FIG. 12, the press forming analysis method in that case includes a first actual blank model generation step S4 instead of the wavy blank model generation step S3, and a first actual blank model generation step S5 instead of the wavy blank press-formed product shape acquisition step S5. First actual blank press-formed product shape acquisition step S6 and first deviation amount acquisition step S7 are replaced with first actual deviation amount acquisition step S8, and period deviation waveform blank model generation step S9 is replaced with second actual blank model generation step S9. Step S10, a second actual blank press-molded product shape acquisition step S12 in place of the cycle-shift wave-shaped blank press-formed product shape acquisition step S11, and a second actual deviation amount acquisition step S14 in place of the second deviation amount acquisition step S13. Prepare. Each step will be specifically described below.

The first actual blank model generating step S4 is a step of measuring the shape of a first actual blank sampled from a predetermined position on the metal plate and generating a first actual blank model based on the measurement results.
The first actual blank press-formed product shape acquisition step S6 uses the first actual blank model to perform press-forming analysis when press-molding is performed with the same predetermined mold model as in the reference press-formed product shape acquisition step S1. 1) is a step of acquiring the shape of the press-formed product after mold release as the shape of the first actual blank press-formed product.
The first actual divergence amount acquisition step S8 is a step of comparing the reference press-formed product shape and the first actual blank press-formed product shape, and determining the part where the two shapes diverge and the deviation amount.

The second real blank model generation step S10 measures the shape of one or more second real blanks sampled from positions different from the first real blank on the metal plate, and based on the measurement results, one type or This is the step of generating a plurality of types of second real blank models.
The second actual blank press-formed product shape acquisition step S12 uses the second actual blank model to perform press-forming analysis when press-molding is performed with the same predetermined mold model as in the reference press-formed product shape acquisition step S1. 1) acquires the shape of the press-formed product after mold release as the shape of the second actual blank press-formed product.
The second actual divergence amount acquisition step S14 is a step of comparing the reference press-formed product shape with one or more types of second actual blank press-formed product shapes, and obtaining the portion where the two shapes diverge and the deviation amount. be.

The above is the same as the example of the flow shown in FIG. are omitted, but the effect can be obtained in the same manner as in the example of FIG.

[Embodiment 2]
The press forming analysis method described in Embodiment 1 can be realized by causing a computer such as a PC (personal 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. 13, the press forming analysis apparatus 15 according to the present embodiment is configured by a computer such as a PC (personal computer), and includes a display device 17, an input device 19, a storage device 21, a working data memory 23 and It has an arithmetic processing unit 25 .
The display device 17, the input device 19, the storage device 21, and the work data memory 23 are connected to the arithmetic processing section 25, and their respective functions are executed by commands from the arithmetic processing section 25. FIG.
Hereinafter, each configuration of the press-forming analysis apparatus 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 17 is used for displaying analysis results, etc., and is composed of a liquid crystal monitor or the like.

≪Input device≫
The input device 19 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 21 is used to store various files such as the shape file 43 of blanks and press-molded products, and is composed of a hard disk or the like.

≪Work data memory≫
The work data memory 23 is used for temporary storage and calculation of data used by the arithmetic processing unit 25, and is composed of a RAM (Random Access Memory) or the like.

≪Arithmetic processing section≫
As shown in FIG. 13, the arithmetic processing unit 25 includes a reference press-formed product shape acquisition unit 27, a wavy blank model generation unit 29, a wavy blank press-formed product shape acquisition unit 31, and a first divergence amount acquisition unit. 33, a period-shifted waveform blank model generation unit 35, a period-shifted waveform blank press-formed product shape acquisition unit 37, a second divergence amount acquisition unit 39, and a countermeasure required part identification unit 41, and a PC It is configured by a CPU (Central Processing Unit) such as.
Each of these units functions when the CPU executes a predetermined program.
Functions of the above-described units in the arithmetic processing unit 25 will be described below.

The reference press-formed product shape acquisition unit 27 executes the reference press-formed product shape acquisition step S1 described in the first embodiment. Similarly, the wavy blank model generation unit 29 performs the wavy blank model generation step S3, the wavy blank press-formed product shape acquisition unit 31 performs the wavy blank press-formed product shape acquisition step S5, and the first divergence amount acquisition unit 33 performs the first divergence amount acquisition step S7, the cycle-shift wave blank model generation unit 35 performs the cycle-shift wave-shape blank model generation step S9, the cycle-shift wave-shape blank press molded product shape acquisition unit 37 performs the cycle-shift wave-shape blank press The second divergence amount acquisition unit 39 executes the second divergence amount acquisition step S13, and the countermeasure required part identification unit 41 executes the countermeasure necessary part identification step S15, respectively.

According to the press-forming analysis device 15 according to the present embodiment, as in the first embodiment, the deviation caused by the part where the shape change in the blank has a large influence on the shape after the springback of the press-formed product and the shape change quantity can be known. Also, since a plurality of patterns of blank models are generated assuming blanks with shape variations and the amount of divergence in each case is obtained, it is possible to take into consideration the fact that there are differences in the shape variations of individual actual blanks.
Then, it is possible to judge the quality of the press-formed product based on the magnitude of the divergence amount, and predict the quality of each blank.
In addition, it is possible to identify which part of the blank before press forming was the cause of the shape defect in the part where the amount of deviation is large (exceeds the threshold), so that countermeasures can be taken immediately, improving productivity. It also leads to
As a result, it is possible to grasp the limit of the shape accuracy of the blank that is within the shape accuracy required for the press-formed product. It is possible to stably perform press molding with a good shape.

The press-forming analysis apparatus 15 of FIG. 13 implements the press-forming analysis method of FIG. 1. When implementing the press-forming analysis method of FIG. can be used. 14, the same parts as in FIG. 13 are denoted by the same reference numerals, and description thereof is omitted.
The press forming analysis device 45 of FIG. The product shape acquisition unit 49, the first actual deviation amount acquisition unit 51 instead of the first deviation amount acquisition unit 33, the second actual blank model generation unit 53 instead of the period shift wave shape blank model generation unit 35, the period shift wave A second actual blank press-formed product shape acquisition unit 55 replaces the shape blank press-formed product shape acquisition unit 37 and a second actual deviation amount acquisition unit 57 replaces the second deviation amount acquisition unit 39 .

The first real blank model generation unit 47 executes the first real blank model generation step S4 described in another aspect of the first embodiment. Similarly, the first actual blank press-formed product shape acquisition unit 49 performs the first actual blank press-formed product shape acquisition step S6, and the first actual deviation amount acquisition unit 51 performs the first actual deviation amount acquisition step S8. The second actual blank model generation unit 53 performs the second actual blank model generation step S10, the second actual blank press-formed product shape acquisition unit 55 performs the second actual blank press-formed product shape acquisition step S12, and the second actual blank model generation step S10. The divergence amount obtaining unit 57 executes the second actual divergence amount obtaining step S14.
The press-forming analysis device 45 also has the same effects as the press-forming analysis device 15 .

Incidentally, as described above, each part of the arithmetic processing part 25 in the press forming analysis devices 15 and 45 of the present embodiment is realized by the CPU executing a predetermined program.
Therefore, the press-forming analysis program according to the present invention provides a computer with a reference press-formed product shape acquisition unit 27, a wavy blank model generation unit 29 (or the first actual blank model generation unit 47), and a wavy blank press-formed product. Shape acquisition unit 31 (or first actual blank press-molded product shape acquisition unit 49), first deviation amount acquisition unit 33 (or first actual deviation amount acquisition unit 51), period deviation waveform blank model generation unit 35 (or Second actual blank model generation unit 53), period deviation waveform blank press-formed product shape acquisition unit 37 (or second actual blank press-formed product shape acquisition unit 55), second divergence amount acquisition unit 39 (or second It can be specified that it functions as the actual divergence amount acquiring unit 57) and the part requiring countermeasure specifying unit 41).

In order to confirm the effects of the present invention, the press forming analysis method described with reference to FIG. 1 was carried out. Molding for CAE analysis in this example was foam molding as in the above embodiment. A blank model of a 1.5 GPa grade steel plate with a thickness of 1.2 mm was also used.
In this example, the reference press-formed product shape acquisition step S1 to the first deviation amount acquisition step S7 were performed in the same manner as in the first embodiment. Therefore, the flat blank model 3, the reference press-formed product shape 5, the wavy blank model 7, the wavy blank press-formed product shape 9, and the deviation amount obtained in the first deviation amount acquisition step S7 are the same as those in FIGS. Therefore, the explanation is omitted.
In the present example, a period-shifted waveform blank 59 different from the period-shifted waveform blank 11 (see FIG. 8) of the first embodiment is generated in the period-shifted waveform blank model generating step S9. 15 to 18, the steps following the step S9 for generating a wave-shaped blank model with a period deviation in this embodiment will be described below. Numerical values, gradation, convexity, depression, Max, and Min shown in FIGS. 15 to 18 are synonymous with those shown in the above embodiment.

FIG. 15(a) shows the period-shifted waveform blank model 59 generated in the period-shifted waveform blank model generation step S9 of this embodiment. (b). 15(c) is a partially enlarged view of FIG. 15(b). The example shown in FIG. 15 has a plate thickness of 1.2 mm, and the amplitude and wavelength of the unevenness are the same as those of the corrugated blank model 7 of FIG. It is misaligned (see FIGS. 15(d) and 15(e)).

FIG. 16(a) shows a cycle-shifted wave-shaped blank press-formed product shape 61 obtained by performing the cycle-shifted wave-shaped blank press-formed product shape acquisition step S11 using the cycle-shifted wave-shaped blank model 59 of FIG.
As shown in FIG. 16(a), the amount of change at the left end (portion A) of the period-shifted waveform blank press-formed product shape 61 is -2.1 mm, and the left end (portion B) of the top plate portion is - 0.3 mm, 0.9 mm at the central portion in the longitudinal direction (part C), 1.7 to 2.0 mm at the lower base (parts D and E), and 2.8 mm at the right end (part F).
FIG. 16(b) shows the amounts of change in the portions A to F in the period-shifted wave-shaped blank press-formed product shape 61, corresponding to the period-shifted wave-shaped blank model 59 (FIG. 15(e)) before the press-forming analysis. show.

In the second deviation amount acquisition step S13, the deviation amount when comparing the reference press-formed product shape 5 and the period-shifted wave-shaped blank press-formed product shape 61 is associated with the irregular shape of the cycle-shifted wave-shaped blank model 61. It is shown in FIGS. 17(a) and 17(b).
As shown in FIG. 17( a ), the amount of divergence when using the period-shifted waveform blank model 59 is −6.5 mm at site A, 0.6 mm at site B, −0.6 mm at site C, and 0.6 mm at site D. 0.4 mm, site E 0.2 mm, site F 4.8 mm.

17(a) and 17(b), it can be considered that the convex shape of the corresponding portion of the period-shifted wave-shaped blank model 59 influences the portion F that deviates most in the convex direction. . Similarly, it is considered that the concave shape of the corresponding portion of the period-shifted wave-shaped blank model 59 has an effect on the portion A that deviates most in the concave direction.

Both the deviation amount obtained in the first deviation amount acquisition step S7 (see FIG. 7) and the deviation amount determined in the second deviation amount acquisition step S13 (see FIG. 17) are converted into a blank shape (illustrated on the flat blank model 3). FIG. 18 shows the correspondence.

In performing joining for assembling the parts constituting the vehicle body, the threshold value of the step S15 for identifying the part requiring countermeasure in the present embodiment was set to ±2.0 mm. As a result, it could be grasped at a glance that some countermeasures were required for the parts A and F. Therefore, we take countermeasures such as correcting the mold corresponding to the relevant part, correcting the relevant part of the blank, and changing the position where the blank is taken from the metal plate. can.

1 Press-formed product (target shape)
3 flat blank model 5 reference press-formed product shape 7 corrugated blank model 9 corrugated blank press-formed product shape 11 cycle-shifted corrugated blank model 13 cycle-shifted corrugated blank press-formed product shape 15 press forming analyzer 17 display device 19 input Apparatus 21 Storage device 23 Work data memory 25 Arithmetic processing unit 27 Reference press-molded product shape acquisition unit 29 Waveform blank model generation unit 31 Waveform blank press-form product shape acquisition unit 33 First divergence amount acquisition unit 35 Cyclic deviation waveform Blank model generating unit 37 Cycle deviation waveform blank press-formed product shape acquisition unit 39 Second divergence amount acquisition unit 41 Part identification unit requiring countermeasure 43 Blank and press-formed product shape file 45 Press forming analysis device (other aspect)
47 First actual blank model generation unit 49 First actual blank press-formed product shape acquisition unit 51 First actual deviation amount acquisition unit 53 Second actual blank model generation unit 55 Second actual blank press-formed product shape acquisition unit 57 Second actual divergence amount acquisition unit 59 Cycle deviation waveform blank model (Example)
61 Cycle deviation waveform blank press molded product shape (Example)

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,
Using a flat blank model with a flat shape, press forming analysis is performed when press forming is performed with a predetermined mold model, and the shape of the press formed product after release from the mold is obtained as the reference press formed product shape. an acquisition step;
a wavy blank model generation step of generating a wavy blank model having a wavy shape with a predetermined wavelength and a predetermined amplitude corresponding to the shape variation;
A corrugated blank press for obtaining a press-formed product shape after mold release as a corrugated blank press-formed product shape by performing press-forming analysis when press-molding is performed with the predetermined mold model using the corrugated blank model. a molded product shape acquisition step;
a first divergence amount acquisition step of comparing the reference press-formed product shape and the wave-shaped blank press-formed product shape, and obtaining a divergence portion and the divergence amount between the two shapes;
a cycle-shifted wave-shaped blank model generation step of generating one or a plurality of types of a cycle-shifted wave-shaped blank model having a wave shape with the same amplitude as that of the wave-shaped blank model but with a shifted cycle;
Using the period-shifted wavy blank model, press-molding analysis is performed when press-molding is performed with the predetermined mold model, and the press-formed product shape after mold release is acquired as the period-shifted wavy blank press-formed product shape. a step of acquiring a shape of a period-shifted waveform blank press-formed product;
a second divergence amount acquisition step of comparing the reference press-formed product shape with one or more types of the period-shifted waveform blank press-formed product shapes, and obtaining a divergence portion and the divergence amount between the two shapes;
and a step of identifying a portion requiring countermeasure for identifying, as a portion requiring countermeasure, a portion having a deviation amount exceeding a threshold among the amounts of deviation obtained in the first step of obtaining the amount of deviation and the step of obtaining the second amount of divergence. Characteristic press forming analysis method. The first divergence amount acquisition step includes:
A difference between a springback amount of a predetermined portion of the reference press-formed product shape and a springback amount of the same portion as the predetermined portion of the reference press-formed product shape of the wavy blank press-formed product shape is obtained as the divergence amount. death,
The second divergence amount acquisition step includes:
The divergence amount is defined as the difference between the springback amount of a predetermined portion in the reference press-formed product shape and the springback amount of the same portion as the predetermined portion of the reference press-formed product shape in the period deviation waveform blank press-formed product shape. The press forming analysis method according to claim 1, characterized in that it acquires as. 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,
Using a flat blank model with a flat shape, press forming analysis is performed when press forming is performed with a predetermined mold model, and the shape of the press formed product after release from the mold is obtained as the reference press formed product shape. an acquisition step;
a first actual blank model generating step of generating a first actual blank model based on measurement results obtained by measuring the shape of the first actual blank sampled from a predetermined position of the metal plate;
Using the first real blank model, press forming analysis is performed when press forming is performed with the predetermined mold model, and the shape of the press-formed product after mold release is obtained as the shape of the first real blank press-formed product. a first actual blank press-molded product shape acquisition step;
a first actual divergence amount acquiring step of comparing the reference press-formed product shape and the first actual blank press-formed product shape, and obtaining a deviation portion and a deviation amount between the two shapes;
Based on the measurement result of measuring the shape of one or more second real blanks taken from a position different from the first real blank on the metal plate, one type or a plurality of types of second real blank models a second real blank model generation step that generates
Using the second real blank model, press forming analysis is performed when press forming is performed with the predetermined mold model, and the shape of the press-formed product after mold release is obtained as the shape of the second real blank press-formed product. a second actual blank press-molded product shape acquisition step;
a second actual deviation amount acquisition step of comparing the reference press-formed product shape with one or more types of the second actual blank press-formed product shapes, and obtaining a deviation portion and a deviation amount between the two shapes;
and a countermeasure-required part identification step of identifying a part in which a deviation amount exceeding a threshold among the deviation amounts obtained in the first actual deviation amount obtaining step and the second actual divergence amount obtaining step is identified as a countermeasure-required part. A press forming analysis method characterized by: The first actual divergence amount acquisition step includes:
The divergence amount is defined as the difference between the springback amount of a predetermined portion in the reference press-formed product shape and the springback amount of the same portion as the predetermined portion of the reference press-formed product shape in the first actual blank press-formed product shape. and get as
The second actual divergence amount acquisition step includes:
The divergence amount is defined as the difference between the springback amount of a predetermined portion in the reference press-formed product shape and the springback amount of the same portion as the predetermined portion of the reference press-formed product shape in the second actual blank press-formed product shape. 4. The press forming analysis method according to claim 3, wherein the data is acquired as A press forming analysis apparatus for predicting the influence of shape variation of a blank obtained from a metal plate with shape variation when press forming is performed using the blank,
Using a flat blank model with a flat shape, press forming analysis is performed when press forming is performed with a predetermined mold model, and the shape of the press formed product after release from the mold is obtained as the reference press formed product shape. an acquisition unit;
a wavy blank model generation unit that generates a wavy blank model having a wavy shape with a predetermined wavelength and a predetermined amplitude corresponding to the shape variation;
A corrugated blank press for obtaining a press-formed product shape after mold release as a corrugated blank press-formed product shape by performing press-forming analysis when press-molding is performed with the predetermined mold model using the corrugated blank model. a molded product shape acquisition unit;
a first divergence amount acquisition unit that compares the reference press-formed product shape and the wave-shaped blank press-formed product shape, and obtains a part where both shapes diverge and the amount of divergence;
a period-shifted wave-shaped blank model generation unit that generates one or a plurality of types of a cycle-shifted wave-shaped blank model having a wave shape having the same amplitude as the wave-shaped blank model in the wave-shaped blank model, but having a wave shape with a shifted period;
Using the period-shifted wavy blank model, press-molding analysis is performed when press-molding is performed with the predetermined mold model, and the press-formed product shape after mold release is acquired as the period-shifted wavy blank press-formed product shape. a period deviation waveform blank press-formed product shape acquisition unit;
a second divergence amount acquisition unit that compares the reference press-formed product shape with one or more types of the period-shift wave-shaped blank press-formed product shapes, and obtains a portion where the two shapes diverge and the amount of divergence;
and a countermeasure-required part identification unit that identifies a part where a deviation amount exceeding a threshold among the deviation amounts obtained by the first deviation amount acquisition part and the second deviation amount acquisition part occurs as a countermeasure-required part. Characteristic press forming analysis equipment. The first divergence amount acquisition unit
A difference between a springback amount of a predetermined portion of the reference press-formed product shape and a springback amount of the same portion as the predetermined portion of the reference press-formed product shape of the wavy blank press-formed product shape is obtained as the divergence amount. death,
The second divergence amount acquisition unit
The divergence amount is defined as the difference between the springback amount of a predetermined portion in the reference press-formed product shape and the springback amount of the same portion as the predetermined portion of the reference press-formed product shape in the period deviation waveform blank press-formed product shape. 6. The press forming analysis apparatus according to claim 5, characterized in that it acquires as. A press forming analysis apparatus for predicting the influence of shape variation of a blank obtained from a metal plate with shape variation when press forming is performed using the blank,
Using a flat blank model with a flat shape, press forming analysis is performed when press forming is performed with a predetermined mold model, and the shape of the press formed product after release from the mold is obtained as the reference press formed product shape. an acquisition unit;
a first actual blank model generation unit that measures the shape of a first actual blank sampled from a predetermined position of the metal plate and generates a first actual blank model based on the measurement result;
Using the first real blank model, press forming analysis is performed when press forming is performed with the predetermined mold model, and the shape of the press-formed product after mold release is obtained as the shape of the first real blank press-formed product. a first actual blank press-formed product shape acquisition unit;
a first actual divergence amount acquisition unit that compares the reference press-formed product shape and the first actual blank press-formed product shape, and obtains a deviation portion and a deviation amount between the two shapes;
Measuring the shape of one or more second real blanks sampled from a position different from the first real blank on the metal plate, and based on the measurement results, one or more types of second real blank models a second real blank model generator that generates
Using the second real blank model, press forming analysis is performed when press forming is performed with the predetermined mold model, and the shape of the press-formed product after mold release is acquired as the shape of the second real blank press-formed product. a second actual blank press-formed product shape acquisition unit;
a second actual deviation amount acquisition unit that compares the reference press-formed product shape with one or more types of the second actual blank press-formed product shapes, and obtains a deviation portion and a deviation amount between the two shapes;
a countermeasure-required part identification unit for identifying a part where a deviation amount exceeding a threshold among the deviation amounts obtained by the first actual deviation amount acquisition part and the second actual deviation amount acquisition part is generated as a countermeasure-required part. A press forming analysis device characterized by: The first actual divergence amount acquisition unit,
The divergence amount is defined as the difference between the springback amount of a predetermined portion in the reference press-formed product shape and the springback amount of the same portion as the predetermined portion of the reference press-formed product shape in the first actual blank press-formed product shape. and get as
The second actual divergence amount acquisition unit,
The divergence amount is defined as the difference between the springback amount of a predetermined portion in the reference press-formed product shape and the springback amount of the same portion as the predetermined portion of the reference press-formed product shape in the second actual blank press-formed product shape. 8. The press forming analysis device according to claim 7, characterized in that it acquires as. 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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