WO2020153494A1 - Procédé d'analyse du degré d'influence de rigidité, dispositif d'analyse du degré d'influence de rigidité et programme - Google Patents

Procédé d'analyse du degré d'influence de rigidité, dispositif d'analyse du degré d'influence de rigidité et programme Download PDF

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WO2020153494A1
WO2020153494A1 PCT/JP2020/002606 JP2020002606W WO2020153494A1 WO 2020153494 A1 WO2020153494 A1 WO 2020153494A1 JP 2020002606 W JP2020002606 W JP 2020002606W WO 2020153494 A1 WO2020153494 A1 WO 2020153494A1
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Prior art keywords
analysis
rigidity
press
execution data
influence
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PCT/JP2020/002606
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English (en)
Japanese (ja)
Inventor
純希 名取
田中　康治
隆司 宮城
操 小川
菅原　稔
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日本製鉄株式会社
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Priority to JP2020516919A priority Critical patent/JP6760546B1/ja
Publication of WO2020153494A1 publication Critical patent/WO2020153494A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]

Definitions

  • the present invention relates to a rigidity influence analysis method, a rigidity influence analysis device, and a program.
  • Press-formed products obtained by press-forming materials such as metal plates are used in automobiles, home appliances, buildings and the like.
  • press-forming materials such as metal plates
  • high-strength thin plates are used as raw materials.
  • Patent Document 1 discloses a springback factor identification method.
  • the shape, residual stress distribution and strain distribution of the press-formed product are calculated by press-forming analysis.
  • springback analysis is performed based on the calculated shape of the press-formed product and the like (first springback analysis step).
  • the springback analysis is performed by changing the Young's modulus in the designated direction of an arbitrary region of the press-formed product (second springback analysis step).
  • second springback analysis step the amount of springback obtained in the first springback analysis step and the amount of springback obtained in the second springback analysis step are compared to determine the residual stress region of the factor of springback and the residual stress. The direction is specified.
  • the rigidity influence degree the degree of rigidity influence.
  • first analysis the force of the rigidity of an arbitrary region of the press-formed product on the deformation of the press-formed product
  • the present inventors perform a normal springback analysis (first analysis) on the press-formed product and change the Young's modulus of an arbitrary region of the press-formed product, as in the above-mentioned Patent Document 1.
  • Springback analysis second analysis was performed, and the difference between the springback amount by the first analysis and the springback amount by the second analysis was obtained. Then, an attempt was made to utilize the obtained difference in springback amount as the degree of rigidity influence.
  • the present invention provides a rigidity influence degree analysis method, a rigidity influence degree analysis device, and a program capable of appropriately analyzing the influence of the rigidity of an arbitrary region of the press formed product on the deformation of the press formed product.
  • the purpose is to
  • the present inventors have conducted various studies to solve the above problems. And the following knowledge was obtained.
  • the Young's modulus or the plate thickness of the above-mentioned area is changed as a numerical value related to the rigidity. It is conceivable that the elasticity analysis is performed. The elasticity analysis is performed assuming that the in-plane average stress and/or the sheet thickness direction deviation stress act on the press-formed product, for example.
  • the in-plane average stress is the average stress of the in-plane direction stress of the press-formed product in the plate thickness direction distribution.
  • the in-plane direction stress is a stress generated in a direction parallel to the surface of the press-formed product (direction orthogonal to the plate thickness direction).
  • the plate thickness direction deviation stress is a deviation stress of the plate thickness direction distribution of the in-plane direction stress, and is a stress distribution obtained by subtracting the average stress component from the plate thickness direction distribution of the in-plane direction stress.
  • Deformation (strain or bending) of any area of the press-formed product at the time of release is mainly due to the release of stress in the area and deformation of the area around the area. appear.
  • the stress relief should be performed with the change of the numerical value regarding the rigidity of the arbitrary region. It is preferable to avoid suppressing or promoting the deformation of the arbitrary region that is a factor.
  • the strain can be represented by the following formula (i), and the bending can be represented by the following formula (ii).
  • ⁇ ⁇ /E (i)
  • ⁇ M/EI (ii)
  • ⁇ indicates the amount of strain
  • ⁇ indicates the stress
  • E indicates the Young's modulus.
  • ⁇ represents the curvature (bending amount)
  • M represents the bending moment
  • E represents the Young's modulus
  • I represents the second moment of area.
  • the plate thickness direction deviation stress (bending moment) generated in the arbitrary region is affected by t 2 and The resulting second moment of area is affected by t 3 . That is, the bending caused by the deviation stress (bending moment) in the plate thickness direction is affected by the plate thickness. Therefore, in order to perform the elastic analysis while avoiding the suppression or promotion of the bending of the arbitrary region due to the stress release as much as possible, the deviation stress in the plate thickness direction is changed according to the change amount of the plate thickness. There is a need.
  • the present invention was made based on the above findings, and has as its gist the following rigidity influence analysis method, rigidity influence analysis device, and program.
  • a stiffness effect analysis method executed by a computer comprising: Of the first analysis execution data for performing the elastic analysis including the numerical data regarding the stress and rigidity of the press-formed product which is the analysis target of the finite element analysis, the value regarding the rigidity of the arbitrary region of the press-formed product is changed.
  • the second analysis execution for executing the elasticity analysis by changing the stress in the region of the first analysis execution data in which the numerical value regarding the rigidity is changed according to the changed numerical value regarding the rigidity.
  • An editing process that generates data, A first analysis step of obtaining first change information regarding a shape change of the press-formed product based on a result of elasticity analysis using the first analysis execution data; A second analysis step of obtaining second change information regarding a shape change of the press-formed product based on a result of elasticity analysis using the second analysis execution data;
  • a stiffness impact degree analysis method comprising: determining the degree of impact of the stiffness of the arbitrary region on the deformation of the press-formed product based on the first change information and the second change information.
  • the stress in a region of the first analysis execution data in which the numerical value regarding the rigidity is changed is changed in accordance with the amount of change in the numerical value regarding the rigidity, and the second analysis execution data is changed.
  • a plurality of second analysis execution data is generated by changing a numerical value regarding the rigidity for each of a plurality of different regions of the press-formed product
  • the second analysis step the second change information regarding the shape change of the press-formed product is obtained for each of the plurality of second analysis execution data
  • the influence degree calculating step the rigidity of each of the plurality of different regions is determined based on the first change information and the second change information obtained for each of the plurality of second analysis execution data.
  • the rigidity influence degree analysis method according to any one of (1) to (6), further including a display step of displaying the influence degree of each of the plurality of different regions in a contour display based on the size thereof.
  • An editorial unit that generates analysis execution data
  • a first analysis unit that obtains first change information regarding a shape change of the press-formed product based on a result of elasticity analysis using the first analysis execution data
  • a second analysis unit that obtains second change information regarding a shape change of the press-formed product based on a result of elasticity analysis using the second analysis execution data
  • a rigidity influence degree analysis device comprising: an influence degree calculation unit that obtains the degree of influence of the rigidity of the arbitrary region on the deformation of the press-formed product based on the first change information and the second change information.
  • the editing unit changes the stress in a region of the first analysis execution data in which the numerical value related to the stiffness is changed according to the amount of change in the numerical value related to the stiffness, and generates the second analysis execution data.
  • the rigidity influence analyzer according to (9) or (10) above.
  • the editing unit calculates an in-plane average stress component of a region of the first analysis execution data in which the numerical value regarding the rigidity is changed.
  • the rigidity influence analyzer according to (10) above which generates the second analysis execution data without changing the above.
  • the editing unit generates a plurality of second analysis execution data by changing a numerical value regarding the rigidity for each of a plurality of different regions of the press-formed product,
  • the second analysis unit obtains the second change information regarding the shape change of the press-formed product for each of the plurality of second analysis execution data,
  • the degree-of-influence calculation unit calculates the rigidity of each of the plurality of different regions based on the first change information and the second change information obtained for each of the plurality of second analysis execution data.
  • the rigidity influence analyzer according to any one of (9) to (13) above, for obtaining the degree of influence on the deformation.
  • FIG. 1 is a block diagram showing a schematic configuration of a rigidity influence analysis apparatus according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing an example of a press-formed product whose rigidity influence is analyzed by the rigidity influence analyzer according to the present embodiment.
  • FIG. 3 is a view showing a cross section of the press-formed product (cross section taken along the line AA in FIG. 2B).
  • FIG. 4 is a block diagram specifically showing the configuration of a rigidity influence analysis apparatus according to an embodiment of the present invention.
  • FIG. 5 is a diagram showing an example of a plurality of regions set in a press-formed product.
  • FIG. 6 is a diagram showing another example of division of a plurality of regions in a press-formed product.
  • FIG. 1 is a block diagram showing a schematic configuration of a rigidity influence analysis apparatus according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing an example of a press-formed product whose rigidity influence is analyzed by the
  • FIG. 7 is a flow chart showing the operation of the rigidity influence analysis method according to the embodiment of the present invention.
  • FIG. 8 is a block diagram showing an example of a computer that realizes the calculation device according to the embodiment of the present invention.
  • FIG. 9 is a contour diagram showing the analysis results of Example 1.
  • FIG. 10 is a contour diagram showing the analysis results of Comparative Example 1A.
  • FIG. 11 is a contour diagram showing the analysis results of Comparative Example 1B.
  • FIG. 12 is a contour diagram showing the analysis results of Example 2.
  • FIG. 13 is a contour diagram showing the analysis results of Comparative Example 2A.
  • FIG. 14 is a contour diagram showing the analysis results of Comparative Example 2B.
  • FIG. 15 is a contour diagram showing the analysis results of Example 3.
  • FIG. 10 is a contour diagram showing the analysis results of Comparative Example 1A.
  • FIG. 11 is a contour diagram showing the analysis results of Comparative Example 1B.
  • FIG. 12 is a contour diagram showing the analysis results of Example 2.
  • FIG. 16 is a contour diagram showing the analysis results of Comparative Example 3A.
  • FIG. 17 is a contour diagram showing the analysis result of Comparative Example 3B.
  • FIG. 18 is a contour diagram showing the analysis results of Example 4.
  • FIG. 19 is a contour diagram showing the analysis results of Comparative Example 4A.
  • FIG. 20 is a contour diagram showing the analysis results of Comparative Example 4B.
  • FIG. 21 is a contour diagram showing the analysis results of Example 5.
  • FIG. 22 is a contour diagram showing the analysis results of Comparative Example 5A.
  • FIG. 23 is a contour diagram showing the analysis results of Example 6.
  • FIG. 24 is a contour diagram showing the analysis results of Comparative Example 6A.
  • FIG. 25 is a contour diagram showing the analysis results of Comparative Example 6B.
  • FIG. 26 is a diagram showing a press-formed product in which a stiffening portion for improving rigidity is provided on the top plate portion.
  • FIG. 1 is a block diagram showing a schematic configuration of a rigidity influence analysis apparatus according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing an example of a press-formed product whose rigidity influence degree is analyzed by the rigidity influence analyzer according to the present embodiment, and (a) is a perspective view of the press-formed product, b) is a plan view of the press-formed product.
  • the press-formed product 100 shown in FIG. 2 includes a top plate portion 102, a pair of vertical wall portions 104, and a pair of flange portions 106, and has a hat-shaped cross section.
  • the shape of the press-formed product to be analyzed by the rigidity influence analysis apparatus according to the present embodiment is limited to the shape shown in FIG. Instead, the rigidity influence analysis apparatus according to the present embodiment can be applied to press-formed products of various shapes.
  • a rigidity influence analysis apparatus 10 (hereinafter, abbreviated as analysis apparatus 10) according to the present embodiment includes an editing unit 12, a first analysis unit 14, a second analysis unit 16, and an influence degree.
  • the calculator 18 is provided.
  • the first analysis execution data is input to the editing unit 12 and the first analysis unit 14.
  • the first analysis execution data is data for executing elasticity analysis by the finite element method.
  • the first analysis execution data and the second analysis execution data described later include numerical data regarding the shape (plate thickness, mesh information, etc.), stress and rigidity of the press-formed product 100 to be analyzed.
  • the first analysis execution data includes, for example, data obtained by using press molding analysis, and includes the shape (plate thickness, mesh information, etc.) of the press molded product 100 before release and residual stress distribution. It includes the data shown and property data such as the Young's modulus of the material of the press-formed product.
  • an elasto-plastic finite element analysis or a one-step finite element analysis is executed using a known press forming analysis device based on the press forming condition set by the user. Can be obtained by
  • the stress included in the first analysis execution data is not limited to the residual stress obtained by the press forming analysis, and may be the stress obtained by other various analyzes or the stress arbitrarily set by the user.
  • the editing unit 12 generates second analysis execution data from the input first analysis execution data. Specifically, the editing unit 12 relates to the rigidity of the arbitrary region 100a of the press-formed product 100 (the region inside the two straight lines indicated by the alternate long and short dash line in FIG. 2B) in the first analysis execution data. Change the numerical value (for example, Young's modulus, section modulus, plate thickness, etc.). Further, as will be described in detail later, the editing unit 12 changes the stress of the region 100a of the first analysis execution data in which the numerical value regarding the rigidity is changed, according to the numerical value regarding the rigidity changed as described above. ..
  • the editing unit 12 changes the numerical value relating to the rigidity of the region 100a in the first analysis execution data, and changes the stress of the region 100a in accordance with the changed numerical value relating to rigidity. Generate analysis execution data.
  • the editing unit 12 outputs the generated second analysis execution data to the second analysis unit 16.
  • the editing unit 12 may change the numerical value regarding the rigidity of the region 100a of the first analysis execution data to the numerical value input by the user, and the numerical value obtained by multiplying the arbitrary coefficient set by the user. You may change to. Further, in the present embodiment, “changing the stress in accordance with the numerical value related to the rigidity” means changing the stress in accordance with the type and the amount of change in the numerical value related to the rigidity. Although the details will be described later, in the present embodiment, the editing unit 12 may generate the second analysis execution data without changing the stress depending on the type of the changed numerical value regarding the rigidity.
  • the position, shape, and size of the area where the numerical value regarding rigidity is changed by the editing unit 12 are not limited to the example shown in FIG. 2B, and can be changed as appropriate.
  • the editing unit 12 may set the area in which the numerical value regarding the rigidity is changed according to the operation of the user, for example.
  • the first analysis unit 14 obtains the first change information regarding the shape change of the press-formed product 100 based on the result of the elasticity analysis using the first analysis execution data.
  • the first analysis unit 14 outputs the obtained first change information to the influence degree calculation unit 18.
  • the first analysis unit 14 performs elasticity analysis based on, for example, shape data of the press-formed product 100 before release, stress distribution data, and property data such as Young's modulus included in the first analysis execution data ( Springback analysis) is performed to calculate the shape (mesh information, etc.) of the press-formed product 100 after release.
  • the 1st analysis part 14 calculates the information which shows the change of the shape of the press-molded article 100 before and after mold release as 1st change information.
  • the first change information is a numerical value indicating the degree of shape change of the press-formed product 100 before and after the elasticity analysis by the first analysis unit 14.
  • the first change information may be, for example, a springback amount calculated by a known method.
  • the first change information may be calculated according to a certain rule, and the calculation method is not particularly limited. Hereinafter, an example of a method of calculating the first change information will be briefly described.
  • FIG. 3 is a diagram showing a cross section of the press-formed product 100 after the elasticity analysis by the first analysis unit 14 (a cross section taken along the line AA of FIG. 2B).
  • the center line in the thickness direction of the top plate portion 102 of the press-formed product 100 before elastic analysis is indicated by a two-dot chain line.
  • the width direction of the top plate portion 102 is indicated by an arrow X
  • the thickness direction of the top plate portion 102 is indicated by an arrow Y.
  • the width direction of the top plate portion 102 will be referred to as the width direction X
  • the thickness direction of the top plate portion 102 will be referred to as the thickness direction Y.
  • the first analysis unit 14 uses the first change information based on, for example, displacements of arbitrary three preset points P1, P2, and P3 of the top plate 102.
  • points P1, P2, and P3 are nodes located at the center of the top plate portion 102 in the thickness direction Y in the analysis model.
  • the point P1 is a node located at one end of the top plate 102 in the width direction X
  • the point P2 is a node located at the other end of the top plate 102 in the width direction X
  • the point P3 is , A node located at the center of the top plate portion 102 in the width direction X.
  • the displacement to one side in the thickness direction Y is defined as a positive displacement
  • the displacement to the other side in the thickness direction Y is defined as a negative displacement
  • the first analysis unit 14 has a larger absolute value of the value obtained by subtracting the displacement of the point P3 from the displacement of the point P1 and the value obtained by subtracting the displacement of the point P3 from the displacement of the point P2. Is used as the first displacement information.
  • the first analysis unit 14 causes the displacement of the point P1 (2.6 mm). It is obtained by subtracting the displacement (-4.6mm) of the point P3 from the value (7.2mm) and the displacement (2.2mm) of the point P2 from the displacement (-4.6mm) of the point P3.
  • the larger absolute value which is 7.2 mm, is set as the first change information.
  • the points P1 and P2 are displaced by 2.6 mm and 2.2 mm on one side in the thickness direction Y, and the point P3 is displaced by 4.6 mm on the other side in the thickness direction Y.
  • the method of calculating the first change information is not limited to the above example.
  • the amount of change (displacement) in coordinates of a specific point (specific node of the analysis model) before and after the analysis by the first analysis unit 14 may be used as the first change information.
  • the amount of change in the distance between two specific points before and after the analysis may be used as the first change information.
  • a reference line connecting two specific points may be defined, and an angle (twist angle) formed by the reference line before analysis execution and the reference line after analysis execution may be used as the first change information.
  • a first reference line connecting the specific first point and the specific second point and a second reference line connecting the specific first point and the specific third point are defined, and the width direction X and the thickness direction Y are defined.
  • the amount of change (angle difference) before and after the analysis of the angle (planar projection angle) formed by the first reference line and the second reference line when viewed from the direction perpendicular to the direction may be used as the first change information.
  • a first reference line passing through two of the four specific points and a second reference line passing through the other two points are defined, and viewed from a direction perpendicular to the width direction X and the thickness direction Y.
  • the amount of change (angle difference) before and after the analysis is performed on the angle formed by the first reference line and the second reference line (planar projection angle) may be used as the first change information.
  • the second analysis unit 16 obtains second change information regarding the shape change of the press-formed product 100 based on the result of the elasticity analysis using the second analysis execution data provided from the editing unit 12. Ask.
  • the second analysis unit 16 performs elasticity analysis (springback analysis) by the same method as the first analysis unit 14, and calculates the shape (mesh information, etc.) of the press-formed product 100 after release. .. Further, the second analysis unit 16 calculates, as the second change information, information indicating the degree of shape change of the press-formed product 100 before and after the mold release, in the same manner as the first analysis unit 14.
  • the second analysis unit 16 outputs the calculated second change information to the influence degree calculation unit 18.
  • the influence degree calculation unit 18 determines that the rigidity of the region 100a is the deformation of the press-formed product 100 based on the first change information input from the first analysis unit 14 and the second change information input from the second analysis unit 16.
  • the degree of influence (hereinafter, referred to as rigidity influence degree) is calculated.
  • the degree-of-impact calculation unit 18 sets, for example, a numerical value obtained by subtracting the numerical value indicated by the second change information from the numerical value indicated by the first change information as the rigidity influence degree of the region 100a. For example, when the first change information is 7.2 mm and the second change information is 3.4 mm, the influence degree calculation unit 18 sets the rigidity influence degree of the region 100a to 3.8 mm.
  • the elasticity analysis of the press-formed product 100 is performed based on the first analysis execution data, and the rigidity of the arbitrary region 100a is changed from the first analysis execution data.
  • Elastic analysis of the press-formed product 100 is performed based on the second analysis execution data obtained in this way. Then, by comparing the analysis result based on the first analysis execution data before the rigidity change and the analysis result based on the second analysis execution data after the rigidity change, the rigidity of the arbitrary region 100a is deformed in the press-formed product 100. Can be calculated.
  • the editing unit 12 changes the stress in the area 100a of the first analysis execution data according to the changed numerical value regarding the rigidity, and generates the second analysis execution data.
  • the deformation (strain) of the region 100a caused by the stress release is caused as compared with the elastic analysis using the first analysis execution data.
  • the stress of the region 100a in the second analysis execution data is set so that the suppression or promotion of (or bending) can be avoided as much as possible.
  • the editing unit 12 increases the stress of the area 100a of the first analysis execution data according to the change amount of the Young's modulus, and the second Generate analysis execution data.
  • the editing unit 12 performs the first analysis according to the change amount of the plate thickness (second moment of area).
  • the second analysis execution data is generated by increasing the deviation stress in the plate thickness direction of the area 100a of the execution data.
  • the strain amount of the region 100a is calculated by the above equation (i)
  • the strain amount calculated using the stress and Young's modulus of the second analysis execution data is the first analysis execution.
  • the stress of the second analysis execution data is set so as to be equal to the amount of strain calculated using the stress and Young's modulus of the data.
  • the bending amount of the region 100a is calculated by the above formula (ii)
  • the bending amount calculated using the stress, Young's modulus, and plate thickness (second moment of area) of the second analysis execution data is set to be equal to the bending amount calculated using the stress, Young's modulus and plate thickness (second moment of area) of the first analysis execution data, in the plate thickness direction of the second analysis execution data. ..
  • FIG. 4 is a block diagram specifically showing the configuration of the rigidity influence analysis apparatus 10 according to the embodiment of the present invention.
  • the analysis device 10 includes a display data generation unit 20 and a display data generation unit 20 in addition to the editing unit 12, the first analysis unit 14, the second analysis unit 16 and the influence degree calculation unit 18 described above.
  • the fixed condition changing unit 22 is provided.
  • the editing unit 12, the first analysis unit 14, the second analysis unit 16, the influence degree calculation unit 18, the display data generation unit 20, and the fixed condition change unit 22 will be described in order.
  • the first analysis execution data is input to the editing unit 12 as described above.
  • the editing unit 12 divides the press-formed product 100 (analysis model) into a plurality of regions based on the shape data of the press-formed product 100 included in the first analysis execution data. Specifically, for example, the editing unit 12 divides the press-formed product 100 into a plurality of regions based on a user's operation so that the press-formed product 100 is divided by a chain line in FIG.
  • the editing unit 12 changes the numerical value regarding the rigidity of the first analysis execution data for each of the plurality of regions set in the press-formed product 100 as described above.
  • the editing unit 12 changes the stress in the first analysis execution data for each of the plurality of regions according to the changed numerical value regarding the rigidity.
  • the editing unit 12 changes the numerical value related to the rigidity of the first analysis execution data for each of the plurality of regions described above, and changes the stress according to the changed numerical value related to the rigidity.
  • a plurality of second analysis execution data are generated. For example, when the editing unit 12 changes the numerical values relating to the rigidity for each of the 50 areas, 50 second analysis execution data are generated.
  • the editing unit 12 may change the Young's modulus by multiplying the Young's modulus of each area by the rigidity changing coefficient K E , or multiply the plate thickness of each area by the rigidity changing coefficient K t.
  • the plate thickness may be changed according to.
  • the editing unit 12 when changing the Young's modulus, the editing unit 12 uniformly changes the Young's modulus regardless of the direction, for example. In other words, the editing unit 12 uniformly modifies the Young's modulus in each direction by the rigidity modification coefficient K E.
  • the stiffness change coefficients K E and K t are set to positive real numbers other than 1, respectively.
  • the editing unit 12 may change only one of the Young's modulus and the plate thickness, or may change both of them. When both the Young's modulus and the plate thickness are changed, the rigidity changing coefficients K E and K t may be different from each other or may be the same.
  • the stress data of the first analysis execution data includes the in-plane average stress component and the plate thickness direction deviation stress component.
  • the in-plane average stress component is the average stress component of the in-plane stress distribution of the press-formed product 100 in the plate thickness direction.
  • the in-plane direction stress is a stress generated in a direction parallel to the surface of the press-formed product 100 (direction orthogonal to the plate thickness direction).
  • the plate thickness direction deviation stress component is a deviation stress of the plate thickness direction distribution of the in-plane direction stress, and is a stress distribution obtained by subtracting the average stress component from the plate thickness direction distribution of the in-plane direction stress.
  • the editing unit 12 changes the Young's modulus and/or the plate thickness of the above-described plurality of regions when the Young's modulus and/or the plate thickness of the first analysis execution data is changed.
  • the stress of the first analysis execution data is changed according to the change amount.
  • the editing unit 12 changes the in-plane stress of the area 100a of the first analysis execution data according to the change amount of the Young's modulus. And the deviation stress in the plate thickness direction is increased (or decreased) to generate the second analysis execution data.
  • the editing unit 12 responds to the change amount of the plate thickness (second moment of area). Then, the deviation stress in the plate thickness direction of the region 100a of the first analysis execution data is increased (or decreased) to generate the second analysis execution data.
  • the editing unit 12 may change the stress of the first analysis execution data according to the change amount of the Young's modulus and/or the plate thickness of the first analysis execution data, and based on the user operation.
  • the editing unit 12 may change the stress of the first analysis execution data. For example, when the Young's modulus of the first analysis execution data is changed by multiplying the rigidity change coefficient K E , the editing unit 12 multiplies the rigidity change coefficient K E to in-plane stress and plate thickness direction. The deviation stress may be changed. Further, for example, editing unit 12, when changing the thickness of the first analysis execution data by multiplying the stiffness changing coefficient K t is the thickness direction deviatoric stress by multiplying the stiffness changing coefficient K t You may change it.
  • the editing unit 12 does not change the in-plane average stress component of the first analysis execution data and changes the first analysis execution data.
  • the second analysis execution data is generated by changing only the deviation stress in the plate thickness direction.
  • the elastic analysis is performed in the state where both the in-plane average stress component and the plate thickness direction deviation stress component are explained, but the elastic analysis is performed by applying only the in-plane average stress component.
  • the elastic analysis may be performed by applying only the deviation stress component in the plate thickness direction.
  • the first analysis unit 14 performs elasticity analysis based on the shape data of the press-formed product 100, the stress distribution data, and the property data such as Young's modulus included in the first analysis execution data, and calculates the first change information.
  • the first analysis unit 14 outputs an analysis result (including shape data and the like) including the first change information to the influence degree calculation unit 18.
  • the second analysis unit 16 performs elasticity analysis based on the shape data of the press-formed product 100, the stress distribution data, and the property data such as Young's modulus, which are included in the second analysis execution data input from the editing unit 12. Change information is calculated.
  • the second analysis unit 16 performs elasticity analysis for each of the plurality of second analysis execution data and calculates second change information. That is, in the present embodiment, the second analysis unit 16 calculates a plurality of second change information corresponding to a plurality of regions whose numerical values regarding rigidity have been changed by the editing unit 12, and calculates the calculated plurality of second change information. It outputs to the influence degree calculation part 18.
  • the degree-of-impact calculation unit 18 obtains the degree of rigidity influence of each of the plurality of regions based on the first change information input from the first analysis unit 14 and the plurality of second change information input from the second analysis unit 16. .. Specifically, the degree-of-impact calculation unit 18 calculates the degree of rigidity influence for each region in which the numerical value regarding rigidity is changed by comparing each of the plurality of second change information with the first change information.
  • the influence degree calculating unit 18 may correct the calculated stiffness influence degree based on the amount of change in the numerical value relating to the rigidity by the editing unit 12. For example, the degree-of-impact calculation unit 18 may divide the calculated degree of rigidity influence by the rigidity change coefficient K E or K t .
  • the influence degree calculating unit 18 outputs the calculated stiffness influence degree (or the corrected stiffness influence degree) to the display data generating unit 20.
  • the display data generation unit 20 displays the rigidity influence degree of each of the plurality of areas (the plurality of areas in which the numerical value regarding the rigidity has been changed by the editing unit 12) input from the influence degree calculation unit 18 based on the size thereof. Generate display data for doing.
  • the display data generation unit 20 outputs the generated display data to, for example, a display device (not shown).
  • a display device not shown.
  • contour diagrams as shown in FIGS. 9, 12, 15, 18, 21 and 23 described later are displayed on the screen of the display device.
  • a plurality of regions of the press-formed product 100 are colored so that the color becomes darker as the degree of rigidity influence increases.
  • the fixed condition changing unit 22 outputs, to the first analysis unit 14 and the second analysis unit 16, information for changing the fixed point that serves as a reference when generating display data according to a user operation.
  • the influence degree calculating unit 18 calculates the rigidity influence degree of each region from the deformation mode of the press-formed product 100 obtained by the elasticity analysis based on the preset fixed point, and the calculated rigidity of each region. Display data is generated based on the degree of influence.
  • the first analysis unit 14 when the information for changing the fixed point is input from the fixed condition changing unit 22, the first analysis unit 14 changes the fixed point (newly set) according to the input information.
  • the first change information is generated based on the fixed point).
  • the first analysis unit 14 first calculates the data such as the shape of the press-formed product 100 before release included in the first analysis execution data and the elasticity analysis using the first analysis execution data. Positioning (moving and/or rotating) at a newly set fixed point is performed for the data such as the shape of the press-formed product 100 after releasing that has been performed. Then, the first analysis unit 14 recalculates the first change information by the same method as described above, and outputs the first change information to the influence degree calculation unit 18. In this case, the first analysis unit 14 can calculate the first change information based on different fixed points without performing new elasticity analysis (springback analysis).
  • the second analysis unit 16 changes a fixed point (a newly set fixed point) according to the input information.
  • a plurality of pieces of second change information are generated based on Specifically, for each of the plurality of second analysis execution data, the second analysis unit 16 includes data such as the shape of the press-formed product 100 before release, which is included in the second analysis execution data, and the second analysis execution data. With respect to the data such as the shape of the press-formed product 100 already calculated by the elasticity analysis using, position adjustment (movement and/or rotation) at a newly set fixed point is performed.
  • the second analysis unit 16 newly calculates the second change information for each of the plurality of second analysis execution data by the same method as described above, and outputs the second change information to the influence degree calculation unit 18.
  • the second analysis unit 16 can calculate a plurality of second change information based on different fixed points without performing a new elasticity analysis (springback analysis).
  • the degree-of-influence calculation unit 18 uses the same method as the above-described method based on the first change information newly calculated by the first analysis unit 14 and the plurality of second change information newly calculated by the second analysis unit 16.
  • the rigidity influence degree of each of the plurality of regions is calculated, and the calculated rigidity influence degree is output to the display data generation unit 20.
  • the display data generation unit 20 generates display data for contour-displaying the rigidity influence degree of each of the plurality of regions input from the influence degree calculation unit 18 based on the size thereof. In this way, the analyzer 10 according to the present embodiment can easily generate the display data for displaying the contour diagram of the stiffness influence degree based on the different fixed points without performing a new elasticity analysis. ..
  • the present embodiment it is possible to calculate the rigidity influence degree of each of a plurality of regions of the press-formed product 100.
  • the user of the analyzer 10 can easily understand which part of the press-formed product 100 should be adjusted in rigidity, and can appropriately suppress the deformation of the press-formed product 100. ..
  • the deformation of the press-formed product 100 can be appropriately suppressed by applying a stiffening measure to the region analyzed by the analysis device 10 as having a high degree of rigidity influence.
  • a stiffening measure for example, it is conceivable to change the shape of the press-formed product such as forming a step, changing the shape of the seat surface, forming a bead.
  • each region and the number of divisions when the press-formed product 100 is divided into a plurality of regions are not limited to the example of FIG. 5, and can be appropriately changed.
  • the shape of each region may be a triangle or a polygon having five or more sides.
  • the top plate portion 102 is set to one area
  • the pair of vertical wall portions 104 is set to one area
  • the pair of flange portions 106 is set to one area. Good.
  • the press-formed product 100 may be divided into a plurality of regions based on the stress distribution data included in the first analysis execution data, as indicated by the dashed line in FIG. It should be noted that the alternate long and short dash line in FIG. 6 represents the isolines shown for each constant stress value.
  • FIG. 7 is a flow chart showing the operation of the rigidity influence analysis method according to the embodiment of the present invention.
  • the rigidity influence degree analysis method according to the present embodiment is performed by operating the analysis device 10.
  • the editing unit 12 and the first analysis unit 14 acquire the first analysis execution data (step S1). Further, as described above, the editing unit 12 generates a plurality of second analysis execution data (step S2).
  • the first analysis unit 14 generates the first change information based on the result of the elasticity analysis using the first analysis execution data (step S3). Furthermore, as described above, the second analysis unit 16 generates a plurality of pieces of second change information based on the results of elasticity analysis using a plurality of second analysis execution data (step S4).
  • the influence degree calculating unit 18 calculates the degree of rigidity influence of each of the plurality of regions of the press-formed product 100 based on the first change information and the plurality of second change information (step S5). ..
  • the display data generation unit 20 generates the display data and displays the contour diagram (step S6).
  • the first analysis unit 14 and the second analysis unit 16 determine whether or not information (hereinafter, referred to as change information) for changing the fixed point is input from the fixed condition changing unit 22 (Ste S7).
  • change information information for changing the fixed point is input from the fixed condition changing unit 22.
  • the first analysis unit 14 regenerates the first change information based on the newly set fixed point as described above (step S8).
  • the second analysis unit 16 newly generates a plurality of pieces of second change information based on the newly set fixed point (step S9).
  • the impact degree calculation unit 18 determines the plurality of regions based on the first change information and the plurality of second change information that are newly generated by the first analysis unit 14 and the second analysis unit 16. The degree of rigidity influence is calculated.
  • FIG. 8 is a block diagram showing an example of a computer that realizes the calculation device according to the embodiment of the present invention.
  • the computer 110 includes a CPU 111, a main memory 112, a storage device 113, an input interface 114, a display controller 115, a data reader/writer 116, and a communication interface 117. These units are connected to each other via a bus 121 so as to be able to perform data communication with each other.
  • the computer 110 may include a GPU (Graphics Processing Unit) or an FPGA (Field-Programmable Gate Array) in addition to the CPU 111 or in place of the CPU 111.
  • the CPU 111 loads the program (code) stored in the storage device 113 into the main memory 112, and executes these in a predetermined order to edit the editing unit 12, the first analysis unit 14, the second analysis unit 16, and the degree of influence.
  • the functions of the calculation unit 18, the display data generation unit 20, and the fixed condition change unit 22 are realized.
  • the main memory 112 is typically a volatile storage device such as a DRAM (Dynamic Random Access Memory).
  • the above program is provided, for example, in a state of being stored in a computer-readable recording medium 120.
  • the above program may be distributed on the Internet connected through the communication interface 117.
  • the storage device 113 include a semiconductor storage device such as a flash memory in addition to a hard disk drive.
  • the input interface 114 mediates data transmission between the CPU 111 and an input device 118 such as a keyboard and a mouse.
  • the display controller 115 is connected to the display device 119 and controls the display on the display device 119.
  • the data reader/writer 116 mediates data transmission between the CPU 111 and the recording medium 120, reads a program from the recording medium 120, and writes the processing result in the computer 110 to the recording medium 120.
  • the communication interface 117 mediates data transmission between the CPU 111 and another computer.
  • the recording medium 120 include general-purpose semiconductor storage devices such as CF (Compact Flash (registered trademark)) and SD (Secure Digital), magnetic recording media such as a flexible disk, or CD- An optical recording medium such as a ROM (Compact Disk Read Only Memory) can be given.
  • CF Compact Flash
  • SD Secure Digital
  • magnetic recording media such as a flexible disk
  • CD- An optical recording medium such as a ROM (Compact Disk Read Only Memory) can be given.
  • the analysis apparatus 10 may be realized by using hardware corresponding to each unit instead of the computer in which the program is installed. Further, the analysis apparatus 10 is partially realized by the program. The remaining part may be realized by hardware.
  • the rigidity influence degree of the press-formed product 100 having the shape shown in FIG. 2 was analyzed by the analysis method according to the present invention. That is, in Examples 1 to 6, the press-formed product 100 was divided into 96 regions, and elastic analysis was performed while changing the stress, Young's modulus, plate thickness, etc. of each region, and the rigidity (Young's modulus or plate thickness) of each region was analyzed. ) Has an influence on the deformation of the press-formed product 100 (rigidity influence degree).
  • Table 1 below shows the analysis conditions for the examples and comparative examples.
  • the material of the press-formed product 100 was a 980 MPa grade cold-rolled steel sheet (sheet thickness 1.2 mm).
  • 9 to 25 are contour charts showing the analysis results of Examples and Comparative Examples. Note that in the contour diagrams shown in FIGS. 9 to 25, a plurality of regions of the press-molded product are colored so that the color becomes darker as the degree of influence of the rigidity or the like on the deformation of the press-molded product 100 increases. ..
  • Example 1 Comparative Example 1A, Comparative Example 1B, Example 6, Comparative Example 6A and Comparative Example 6B, a state in which both the in-plane average stress component and the plate thickness direction deviation stress component are applied Elasticity analysis was performed.
  • Example 2 Comparative Example 2A, Comparative Example 2B, Example 5 and Comparative Example 5A
  • Example 3 Comparative Example 3A, Comparative Example In 3B, Example 4, Comparative Example 4A, and Comparative Example 4B
  • the elastic analysis was performed in the state where only the sheet-thickness direction deviatoric stress component was applied.
  • Example 1 shows that the top plate portion 102 (see FIG. 2) has concentrated areas having a large influence degree. Based on this result, as shown in FIG. 26, when the stiffening portion 108 was formed on the top plate portion 102, the deformation amount of the press-formed product 100 was significantly reduced.
  • the degree of influence of rigidity (the degree of influence of the rigidity of an arbitrary region of the press-formed product on the deformation of the press-formed product) can be appropriately analyzed. That is, according to the present invention, it has been found that it is possible to appropriately specify the rigidity-improved portion for suppressing the deformation of the press-formed product, which was difficult to specify by the conventional analysis method.
  • FIG. 26 is a diagram showing a press-molded product in which stiffening countermeasures are applied to a portion having a high rigidity influence degree based on the analysis results of Examples 1 to 6.
  • a stiffening portion 108 for improving rigidity is provided on the surface of the top plate portion 102.
  • the stiffening portion 108 is composed of a plurality of beads.
  • analysis device 12 editing unit 14 first analysis unit 16 second analysis unit 18 influence degree calculation unit 20 display data generation unit 22 fixed condition change unit 100 press-formed product

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Abstract

L'invention concerne un procédé d'analyse du degré d'influence de rigidité comprenant : une étape d'édition consistant à modifier des valeurs numériques se rapportant à la rigidité d'une zone arbitraire d'un article formé à la presse dans des premières données d'exécution comprenant des données numériques se rapportant à la contrainte et à la rigidité de l'article formé à la presse, à modifier la contrainte de la zone dans laquelle la valeur numérique se rapportant à la rigidité a été modifiée dans les premières données d'exécution en fonction de la valeur numérique modifiée se rapportant à la rigidité, puis à générer des secondes données d'analyse et d'exécution ; une première étape d'analyse consistant à obtenir des premières informations de modification concernant une modification de forme de l'article formé à la presse sur la base d'un résultat d'analyse d'élasticité obtenu à l'aide des premières données d'analyse et d'exécution ; une seconde étape d'analyse consistant à obtenir des secondes informations de modification concernant un modification de forme de l'article formé à la presse sur la base d'un résultat d'analyse d'élasticité obtenu à l'aide des secondes données d'analyse et d'exécution ; et une étape de calcul du degré d'influence consistant à obtenir un degré d'influence entre la rigidité de la zone arbitraire et la déformation de l'article formé à la presse sur la base des premières informations de modification et des secondes informations de modification.
PCT/JP2020/002606 2019-01-25 2020-01-24 Procédé d'analyse du degré d'influence de rigidité, dispositif d'analyse du degré d'influence de rigidité et programme WO2020153494A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7501984B2 (ja) 2020-09-01 2024-06-18 ダイハツ工業株式会社 プレス加工解析ソフトの評価方法

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Publication number Priority date Publication date Assignee Title
JP2007229724A (ja) * 2006-02-27 2007-09-13 Jfe Steel Kk プレス成形解析方法
JP2008087015A (ja) * 2006-09-29 2008-04-17 Nippon Steel Corp スプリングバック発生原因部位特定方法、その装置、及びそのプログラム
JP2014065056A (ja) * 2012-09-26 2014-04-17 Jfe Steel Corp プレス成形品のスプリングバック要因特定方法および装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007229724A (ja) * 2006-02-27 2007-09-13 Jfe Steel Kk プレス成形解析方法
JP2008087015A (ja) * 2006-09-29 2008-04-17 Nippon Steel Corp スプリングバック発生原因部位特定方法、その装置、及びそのプログラム
JP2014065056A (ja) * 2012-09-26 2014-04-17 Jfe Steel Corp プレス成形品のスプリングバック要因特定方法および装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7501984B2 (ja) 2020-09-01 2024-06-18 ダイハツ工業株式会社 プレス加工解析ソフトの評価方法

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