Technical field
[0001]
　The present invention is method of forming a metal plate, the design method of the intermediate shape molding die of the metal plate, a computer program, and a recording medium.
BACKGROUND
[0002]
　In the press molding of a metal plate, thickness reduction of the portion deformed by pressing is not always uniform, for example, a metal plate by press molding to form a convex bulged portion, the plate at the top portion of the bulging portion the thickness is most reduced to, which can lead to necking (local constriction) or cracking. Therefore by dispersing sheet thickness reduction across components, technology to utilize to the utmost limit of the material (use up materials) are desired. In particular, the ultra-high-tensile steel (High Tensile Strength Steel), since cracks even occurred a slight thickness reduction occurs, it is necessary to reduce the maximum value of the sheet thickness reduction rate in the metal plate.
[0003]
　Japanese Patent No. 4879588 discloses, since spring back is large when there is a ridge that large residual stress is generated in the press-forming parts, in the draw process is the former step of the press-molding process, the mold corresponding portion shape was smaller shape radius of curvature than 1mm than the final shape of the site, then when it is molded into a final shape by stamping, by molding so as to push back the overhanging portion on the outside, the ridge tensile residual metal plate press-forming method of alleviating stress is described. However, in the Patent No. 4879588 discloses a method, since there is a limit to the tensile strength of the metal plate is a radius of curvature and blank ridge portion (metal plate before forming), the degree of freedom of the shape of the press molded part is restricted There's a problem. Further, Patent Chapter 4879588 discloses, for the occurrence of necking and cracking due to thickness reduction, not show any measures.
[0004]
　Further, JP-A-2007-326112, the blank die and blank holder and blank holder, by performing the preforming overhanging the blank in the state in which the movable punch is protruded ahead mold, conventionally hardly deformed It leads to increase in surface area due to reduction in thickness also the region of the bottom surface of products that do not, press molding method to provide a uniform deformation in a wide range of molded panel is described. However, the method described in JP 2007-326112 is a method suitable for press molding of the cylindrical container, the application of the shape other than the cylindrical container is not considered. In the method described in JP-A-2007-326112, for molding a molded article in a single pressing step, it is complicated shape of the mold. Further, the region for dispersing the distortion because limited to the punch shoulder part and vertical wall portion, not a fundamental solution of necking and cracking due to the thickness reduction.
Summary of the Invention
Problems that the Invention is to Solve
[0005]
　The present invention has been made in view of the above circumstances, capable of reducing the maximum value of the sheet thickness reduction rate after press forming, metal plate shaping method, the design method of the intermediate shape, for forming of the metal plate mold computer programs, and to provide a recording medium and an object.
Means for Solving the Problems
[0006]
　The present invention relates, discloses the following embodiments (1) to (32).
(1) when molding the molded shape a metal plate by press molding, the metal plate shaped into different intermediate shapes and the forming shape, then the metal plate molded directly into the molded shape through the intermediate shape a molding method,
　when molding the intermediate shape of the metal plate, is better in the case of molding the molded shape from the intermediate shape than when formed into the molded shape from the metal plate, the metal plate by forming the region including at least part of the sheet thickness reduction rate is greater in the first region from, molding the intermediate shape
　molding process of the metal plate.
(2) below the first step and the following element data of the metal plate of the molded shape in the finite element analysis obtained by sequentially performing the second step (B) and element data of the virtual metal plate before forming (D) based on,
　wherein the some of the elements corresponding to the first region of the element data of the virtual metal plate before forming (D), the molded shape corresponding to each element of the partial elements given strain required to deform the shape of each element of the element data of the metal plate (B),
　is molded into the molded shape through the intermediate shape of the element data of the virtual metal plate before the molding (D) the remaining elements corresponding to a second region including at least part it is a site thickness reduction ratio is large from the metal plate when directly molded into the molded shape from the metal plate than when the the formed shape corresponding to the elements of the remaining elements Without giving or strain gives a small strain of absolute value than the strain required to deform the shape of each element of the element data of the metal plate (B),
　Wherein the shape of the intermediate shape of the virtual metal plate element data after deformation when the deforming the virtual metal plate before forming (G), (1) method of forming a metal sheet according.
　The first step: the step of providing a component data (A) and element data of the metal plate of the molded shape of the temporary metal plate (B).
　The second step: the element data of the temporary metal plate (A) and element data of the metal plate of the molded shape (B), of the corresponding temporary as the difference in shape is reduced between the elements of the metal plate element determining a data (D) of the virtual metal plate before molding by modifying the element data (a).
(3) the first step, the forming analysis by the finite element method, on the basis of the element data (A) of the temporary metal plate, obtaining the element data (B) of the metal plate of the molded shape
　(2), wherein method of forming a metal plate.
(4) the first step is the inverse analysis by the finite element method, based on the element data of the metal plate of the molded shape (B), obtains the element data (A) of the temporary metal plate
　(2) method of forming a metal sheet according.
(5) In the above second step, following the 2-1 step, following the first 2-2 to perform steps and sequentially the following 2-3 step,
　the molded shape and element data (A) of the temporary metal plate the element data of (B) of the metal plate, the corresponding element data in the virtual metal plate before molding by modifying the element data (a) of the temporary metal plate so that the difference in shape between the elements is reduced ( and obtaining the D) (2) to (metal plate shaping method according to any one of 4).
　2-1 Step: required to elastically deform the shape of each element of the element data of the metal plate of the formed shape corresponding to the elements of the element data (A) of the temporary metal plate (B), wherein determining for each element of the element data (a) of the temporary metal plate stress (F1) to be applied to each element of the element data of the temporary metal plate (a).
　2-2 Step: each element of the element data of the temporary metal plate (A), the absolute value gives the stress (F1) or more stress (F2) obtained in the first 2-1 steps, each creating a finite element model providing the conditions for restraining the displacement of the out-of-plane direction of the nodes of the finite element (I).
　2-3 Step: the first 2-2 finite element model created in step (I) is carried out elastic deformation analysis using the finite element method based obtains element data after elastic deformation (H), the temporary of the shape of each finite element of the element data of the metal plate (a), modified to the shape of the finite elements of the finite element data after elastic deformation (H), the virtual before molding finite element data that fixes the step of the element data of the metal plate (D).
(6) the stress (F2), the absolute value is 1.5 times or less of the stress of the stress (F1) than large and the stress (F1)
　(5) metal plate shaping method according.
(7) the pre-forming of the virtual metal plate element data (D) of the required stresses to shape the elastic deformation of each element of the element data of the metal plate of the molded shape corresponding to each element (B) (F3 ) and determined for each element of the element data of the virtual metal plate before the molding (D),
　Wherein together Some elements of the element data of the virtual metal plate before forming (D) stressing (F3) necessary for the elastic deformation, the element data of the virtual metal plate before the molding of the (D) rest of the elements to create a finite element model (J) which does not give or stress giving a small stress absolute value than the stress (F3) necessary for the elastic deformation,
　also the finite element model (J) DOO to, by performing elastic deformation analysis by a finite element method,
　wherein the part of the elements of the element data of the virtual metal plate before forming (D), a metal plate of the molded shape corresponding to the part of element given strain required to deform the shape of each element of the element data of (B),
　wherein the remaining elements of the element data of the virtual metal plate before forming (D), wherein corresponding to the remaining elements of each element of the element data of the metal plate molded shape (B) Without giving an absolute value smaller or distortions give or strain than the strain required to deform Jo,
　determine the element data of the virtual metal plate after deformation when the deforming (G),
characterized in that (2) to metal plate shaping method according to any one of (6).
(8) of the remaining elements of the element data of the virtual metal plate before forming (D), wherein the vicinity of the boundary elements and some elements gives a smaller stress than the absolute value of the stress (F3), gradually absolute value decreases stress applied to the remaining elements as the distance from the element of the boundary proximity
　(7) forming method of a metal plate according.
(9) is replaced with the element data of the temporary metal plate the element data of the virtual metal plate before forming (D) obtained in the second step in the first step (A), the first steps and performing said second step, or any one of the element data of the virtual metal plate before molding by performing the second step, characterized in that re seeking (D) (2) to (8) method of forming a metal sheet according to.
(10) the upper limit of the state variation before and after the molding of the corresponding elements between the element data of the element data of the virtual metal plate before molding (D) a metal plate of the molded shape (B) ([Delta] X) threshold, or it sets a threshold and lower threshold of limit,
　if you set only upper threshold of the state variation ([Delta] X), the state variation to the element data maximum value is equal to or lower than a threshold of ([Delta] X) made up,
　if you set the upper and lower thresholds of the state variation ([Delta] X), the maximum and minimum values is less than the threshold value and the lower limit threshold value or more element data of the upper limit of the state variation ([Delta] X) until
　the element data (D) of the virtual metal plate before the molding obtained in the second step after replacing the element data of the temporary metal plate in the first step (a), the first step and the second Suteppuma Forming a metal sheet according to any one of which is characterized by repeating the re determined element data (D) of the virtual metal plate before molding by performing the second step (2) to (9) Method.
(11) when forming a metal plate to press forming to molded shape, said metal plate sequentially forming a plurality of different intermediate shapes and the forming shape, the last intermediate shape of the metal plate for forming the formed shape a molding method,
　Among the plurality of obtaining the intermediate shape step and step of obtaining the molded shape, in the whole or part of the process, the resulting shape forming method according to any one of (1) to (10), an intermediate shape molding in the previous step of the process, the molding process of the metal plate.
(12) when molding the molded shape a metal plate by press-forming, the intermediate shape when the metal plate is formed into a different intermediate shapes and the forming shape, then molded into the molded shape from the intermediate shape a design method,
　when molding the intermediate shape of the metal plate, is better in the case of molding the molded shape through the intermediate shape than when molded directly into the molded shape from the metal plate, after forming the first region thickness reduction ratio is large from the metal plate first, towards the case of molding the molded shape from the metal plate than in the case of molding the molded shape from the intermediate shape distortion or the shape of a case where sheet thickness reduction rate was molded first region including at least part of a larger region, and the intermediate shape
　design method of the intermediate shape.
(13) below the first step and the following element data of the metal plate of the molded shape in the finite element analysis obtained by sequentially performing the second step (B) and element data of the virtual metal plate before forming (D) based on,
　wherein the some of the elements corresponding to the first region of the element data of the virtual metal plate before forming (D), the molded shape corresponding to each element of the partial elements given strain required to deform the shape of each element of the element data of the metal plate (B),
　Plate from the metal plate toward the case of molding directly on the molded shape from the metal plate than in the case of molding the molded shape through the intermediate shape of the element data of the virtual metal plate before the molding (D) the remaining elements corresponding to a second region including at least part of the sites thickness reduction rate is large, the respective elements of the element data of the metal plate molded shape (B) corresponding to each element of the remaining elements small strain without giving give or a strain, the absolute value than the strain required to deform the shape of
　the element data of the virtual metal plate after deformation when the deforming the virtual metal plate before forming (G the shape of) the said intermediate shape, (11) a method of designing a middle shape description.
　The first step: the step of providing a component data (A) and element data of the metal plate of the molded shape of the temporary metal plate (B).
　The second step: the temporary metal so that the difference in shape between the elements topologically corresponding decrease of element data of the metal plate element data (A) and the molded shape of the temporary metal plate (B) steps to modify the element data of the plate (a) determine the element data of the virtual metal plate before forming (D).
(14) the first step, the forming analysis by the finite element method, on the basis of the element data (A) of the temporary metal plate, obtaining the element data of the metal plate of the molded shape (B)
　(13), wherein design method of the intermediate shape.
(15) the first step is the inverse analysis by the finite element method, based on the element data of the metal plate of the molded shape (B), obtains the element data (A) of the temporary metal plate
　(13) design method of the intermediate shape of the description.
(16) In the above second step, following the 2-1 step, following the first 2-2 to perform steps and sequentially the following 2-3 step,
　the molded shape and element data (A) of the temporary metal plate the element data of (B) of the metal plate, the corresponding element data in the virtual metal plate before molding by modifying the element data (a) of the temporary metal plate so that the difference in shape between the elements is reduced ( design method of the intermediate shape of any one of, wherein the determination of the D) (13) to (15).
　2-1 Step: each element topologically corresponding element data of said temporary metal plate (A)
required to elastically deform the shape of each element of the element data of the metal plate of the molded shape (B) Do, determining for each element of the element data (a) of the temporary metal plate stress (F1) to be applied to each element of the element data of the temporary metal plate (a).
　2-2 Step: each element of the element data of the temporary metal plate (A), the absolute value gives the stress (F1) or more stress (F2) obtained in the first 2-1 steps, each creating a finite element model providing the conditions for restraining the displacement of the out-of-plane direction of the nodes of the finite element (I).
　2-3 Step: the first 2-2 finite element model created in step (I) is carried out elastic deformation analysis using the finite element method based obtains element data after elastic deformation (H), the temporary of the shape of each finite element of the element data of the metal plate (a), modified to the shape of the finite elements of the finite element data after elastic deformation (H), the virtual before molding finite element data that fixes the step of the element data of the metal plate (D).
(17) the stress (F2), the absolute value is 1.5 times or less of the stress of the stress (F1) than large and the stress (F1)
　(16) design method of the intermediate shape of the description.
(18) the pre-forming of the virtual metal plate element data (D) of the required stresses to shape the elastic deformation of each element of the element data of the metal plate of the molded shape corresponding to each element (B) (F3 ), said calculated for each element of the element data of the virtual metal plate before forming (D),
　wherein the part of the elements of the element data of the virtual metal plate before forming (D) required to the elastic deformation together provide stress (F3) such, the or the remaining elements of the element data of the virtual metal plate before forming (D) gives a small stress absolute value than the stress (F3) necessary for the elastic deformation or stress creates a finite element model (J) which does not give,
　on the basis of the finite element model (J), by performing elastic deformation analysis by a finite element method,
　the element data of the virtual metal plate before the molding (D some elements), corresponding to the portion elements The molded shape given strain required to deform the shape of each element of the element data of the metal plate (B) of,
　wherein the remaining elements of the element data of the virtual metal plate before forming (D), the remaining without giving or strain gives a small strain of absolute value than the strain required to deform the elements to the shape of each element of the element data of the metal plate of the molded shape corresponding (B),
　a modified version of Request element data of the virtual metal plate after deformation (G),
the design method of the intermediate shape according to any one of, wherein (13) to (17) that.
(19) of said remaining elements of the element data of the virtual metal plate before forming (D), wherein the vicinity of the boundary elements and some elements gives a smaller stress than the absolute value of the stress (F3), gradually absolute value decreases stress applied to the remaining elements as the distance from the element of the boundary vicinity
　(18) design method for an intermediate shape of the description.
(20) after replacing the element data of the temporary metal plate the element data of the virtual metal plate before forming (D) obtained in the second step in the first step (A), the first steps and performing said second step, or any one of the element data of the virtual metal plate before molding by performing the second step, characterized in that re seeking (D) (13) to (19) design method of the intermediate shape described.
(21) state change amount before and after the molding of each finite element corresponding topologically between the element data of the before molding virtual metal plate element data (D) and the metal plate of the molded shape of the (B) ( the upper limit of the threshold value of [Delta] X), or by setting a threshold and lower threshold of limit,
　if you set only upper threshold of the state variation ([Delta] X), the following maximum threshold state variation ([Delta] X) until the element data,
　when setting the upper and lower thresholds of the state variation ([Delta] X) is the state variation maximum value and the minimum value is equal to or less than the threshold value of the upper limit and the lower limit of the threshold or more of the ([Delta] X) until the element data,
　After replacing the element data of the temporary metal plate element data of the virtual metal plate before the molding obtained in the second step (D) is in the first step (A), the first step and the intermediate according to any one of the element data of the second step or virtual metal plate before molding by performing the second step and repeating the re seeking (D) (13) to (19) a method of designing a shape.
(22) when forming a metal plate to press forming to molded shape, the case where the metal plates are sequentially formed into a plurality of different intermediate shape from the molded shape is formed into the molded shape from the last intermediate shape in the design method of the intermediate shape,
　the plurality of obtaining the intermediate shape step and step of obtaining the molded shape, in the whole or a part process, design method according to any one of (12) - (21) the resulting shape, an intermediate shape molding in the previous step of the process, the design method of the intermediate shape.
(23) (1) to obtained intermediate shape in the forming method of a metal plate according to any one of (11), the molding die of the metal plate, characterized in that it comprises the shape of the die face .
(24) when molding the molded shape a metal plate by press molding, the metal plate shaped into different intermediate shapes and the forming shape, then, the intermediate shape when molded into the molded shape from the intermediate shape a computer program for designing,
　on the computer,
　when molding the intermediate shape of the metal plate, the molded shape through the intermediate shape than when molded directly into the molded shape from the metal plate step it is, the shape of the case of forming the first region including at least part of the sites thickness reduction ratio is large from the metal plate, and the intermediate shape in forming
　Computer program for executing the processing including.
(25) in a finite element analysis, the element data of the temporary metal plate (A), based on the element data (B) of the metal plate forming a shape corresponding to the element data (A) of the temporary metal plate ,
　by sequentially performing the first 2-1 steps and following the 2-2 step below,
　between the elements of the element data of the metal plate element data (a) and the molded shape of the temporary metal plate (B) for performing elastic deformation analysis by a finite element method for differences determine the element data of the virtual metal plate before molding by modifying the element data of the temporary metal plate (a) so as to reduce (D) shape It includes creating a finite element model (I) (24), wherein the computer program.
　2-1 Step: The respective elements of the element data (A) of the temporary metal plate, necessary to elastically deform the shape of each element of the element data of the metal plate of the molded shape (B), the provisional of determining for each element of the element data (a) of the temporary metal plate stress (F1) to be applied to each element of the element data of the metal plate (a).
　2-2 Step: each element of the element data of the temporary metal plate (A), the absolute value gives the stress (F1) or more stress (F2) obtained in the first 2-1 steps, each creating a finite element model providing the conditions for restraining the displacement of the out-of-plane direction of the nodes of the finite element (I).
(26) based on the finite element method analysis, the element data of the temporary metal plate (A) of the temporary metal plate and element data (A) a topologically element data of the metal plate in-phase molded shape (B) the,
　following the 2-1 step, by sequentially performing the first 2-2 steps and following 2-3 step below,
　Topologically corresponding element data of the temporary metal plate so that the difference becomes smaller shape between the elements of the element data of the temporary metal plate (A) and element data of the metal plate of the molded shape (B) Correct the (a) comprises determining the element data of the virtual metal plate before forming (D) (24), wherein the computer program.
　2-1 Step: each element topologically corresponding element data of said temporary metal plate (A)
required to elastically deform the shape of each element of the element data of the metal plate of the molded shape (B) Do, determining for each element of the element data (a) of the temporary metal plate stress (F1) to be applied to each element of the element data of the temporary metal plate (a).
　2-2 Step: each element of the element data of the temporary metal plate (A), the absolute value gives the stress (F1) or more stress (F2) obtained in the first 2-1 steps, each creating a finite element model providing the conditions for restraining the displacement of the out-of-plane direction of the nodes of the finite element (I).
　2-3 Step: perform elastic deformation analysis using the finite element method based on the finite element model (I), obtains the element data after elastic deformation (H), the element data of the temporary metal plate (A) each shape of the finite element, modified to a shape of each finite element of the finite element data after elastic deformation (H), finite element data and element data of the virtual metal plate before forming (D) that fixes the step to.
(27) the stress (F2), the stress is 1.5 times the stress (F1) than large and the stress (F1)
　(25) or (26), wherein the computer program.
(28) element data of the finite in element analysis, before molding virtual metal plate (D) and the element data of the metal plate forming a shape corresponding to the element data of the virtual metal plate before the molding (D) (B) based on,
　the elements of the element data of the virtual metal plate (D) before the molding, the elements of the metal plate of the formed shape corresponding to the elements of the element data of the virtual metal plate before forming (D) obtains data (B) stress (F3) necessary for elastic deformation to the shape of each element of each element,
　corresponding to the first region of the element data of the virtual metal plate before forming (D) with the some elements stressing (F3) necessary for the elastic deformation, than in the case of molding the molded shape through the intermediate shape of the element data of the virtual metal plate before forming (D) before better even when directly molded into the molded shape from the metal plate Providing a small stress absolute value than the stress (F3) necessary for the elastic deformation in the remaining elements corresponding to a second region including at least part of the sites thickness reduction ratio is large from the serial metal plate or stress includes creating a finite element model (J) which does not give (25) to (27) or a computer program according to one of.
(29) on the basis of the finite element model (J), by performing elastic deformation analysis by a finite element method,
　corresponding to the first region of the element data of the virtual metal plate before the molding (D) some elements, giving strain required to deform the shape of each element of the element data of the metal plate molded shape (B) corresponding to each element of the partial elements,
　Wherein the remaining elements corresponding to the second region of the element data of the virtual metal plate before forming (D), element data of the metal plate of the molded shape corresponding to the elements of the remaining element (B without giving or strain gives a small strain of absolute value than the strain required to deform the shape of each element of)
　the virtual metal plate after deformation when the deforming the virtual metal plate before the molding Request element data (G),
comprising (28), wherein the computer program.
(30) of said remaining elements of the element data of the virtual metal plate before forming (D), wherein the vicinity of the boundary elements and some elements gives a smaller stress than the absolute value of the stress (F3), the gradually absolute value decreases stress applied to the remaining elements as the distance from the vicinity of the boundary element
　(28) or (29), wherein the computer program.
(31) by forming analysis by the finite element method, the determined element data of said temporary metal plate in molding a temporary metal plate molded shape (A), element data of the metal plate of the molded shape (B) 1 and step,
　based on the finite element model (J), by performing elastic deformation analysis by a finite element method, the third step of the intermediate shape,
　in order to the execution of (28) to (30) any computer program according to one of.
(32) after replacing the element data of the temporary metal plate element data of the virtual metal plate before the molding obtained in the first 2-3 step (D) in the first step (A), wherein the first step - the 2-3 step, or, perform said 2-1 sequentially performing steps - the first 2-3 step again determined element data of the virtual metal plate before forming (D) to the computer computer program according to (31) to be.
(33) the upper limit of the state variation before and after the molding of the corresponding elements between the element data of the element data of the virtual metal plate before molding (D) a metal plate of the molded shape (B) ([Delta] X) threshold, or it sets a threshold and lower threshold of limit,
　if you set only upper threshold of the state variation ([Delta] X), the state variation to the element data maximum value is equal to or lower than a threshold of ([Delta] X) made up,
　if you set the upper and lower thresholds of the state variation ([Delta] X), the maximum and minimum values is less than the threshold value and the lower limit threshold value or more element data of the upper limit of the state variation ([Delta] X) until,
　after replacing the element data of the temporary metal plate element data of the virtual metal plate before the molding obtained in the first 2-3 steps (D) in the first step (a), said first 1 step-the 2-3 step Or and repeating that again obtains the element data of the virtual metal plate (D) before molding by performing the first 2-1 steps - the first 2-3 step (31) or according to (32) computer program.
(34) when molding the molded shape a metal plate by press molding, the metal plate sequentially forming a plurality of different intermediate shape from the molded shape, said in molding the molded shape from the last intermediate shape a computer program for obtaining the intermediate shape,
　The computer
　(31) to (33) by replacing either a shape determined in the computer program according to one of the intermediate shape, sequentially performing the third step from the first step (31) to (33 any computer program according to one of).
(35) (24) to (34) recording a computer readable recording medium a computer program according to any one of.

The scope of the claims
[Requested item 1]
　When molding the molded shape a metal plate by press molding, the metal plate shaped into different intermediate shapes and the forming shape, then a forming method of a metal plate for forming the molded shape from the intermediate shape ,
　when molding the intermediate shape of the metal plate, is better in the case of molding from the metal plate into the molded shape through the intermediate shape than when molded directly into the molded shape, a plate from said metal plate by shaping the first region including at least part of the sites thickness reduction rate is large, molding the intermediate shape
　molding process of the metal plate.
[Requested item 2]
　Based on the following first step and the following element data of the metal plate of the molded shape in the finite element analysis obtained by performing second and a step sequential (B) and element data of the virtual metal plate before forming (D) in,
　wherein the portion of the element corresponding to the first region of the element data of the virtual metal plate before forming (D), the metal plate of the forming shape corresponding to each element of the partial elements given strain required to deform the shape of each element of the element data (B),
　than the case of molding the molded shape through the intermediate shape of the element data of the virtual metal plate before the molding (D) the remaining elements corresponding to the second region it is comprising at least part of the sites thickness reduction ratio is large from the metal plate when directly molded into the molded shape from the metal plate, the remaining elements the metal of the mold shape corresponding to each element of Small strain without giving give or distortion of absolute value than the strain required to deform the shape of each element of the element data (B) of,
　after deformation of a modified version of a virtual metal plate before the molding the shape of the element data of the virtual metal plate (G) of the intermediate shape, metal plate shaping method according to claim 1, wherein.
　The first step: the step of providing a component data (A) and element data of the metal plate of the molded shape of the temporary metal plate (B).
　The second step: the element data of the temporary metal plate (A) and element data of the metal plate of the molded shape (B), of the corresponding temporary as the difference in shape is reduced between the elements of the metal plate element determining a data (D) of the virtual metal plate before molding by modifying the element data (a).
[Requested item 3]
　The first step is the forming analysis by the finite element method, on the basis of the element data (A) of the temporary metal plate, obtaining the element data of the metal plate of the molded shape (B)
　a metal plate of claim 2, wherein the method of molding.
[Requested item 4]
　The first step is the inverse analysis by the finite element method, the element data of the metal plate molded shape (B) on the basis, determine the element data (A) of the temporary metal plate
　of claim 2 wherein the metal method of molding a plate.
[Requested item 5]
　In the second step, following the 2-1 step, by sequentially performing the first 2-2 steps and 2-3 step following below,
　the metal plate element data (A) and the molded shape of the temporary metal plate of the element data (B), the corresponding element data in the virtual metal plate before the difference is to modify the element data of the temporary metal plate (a) so as to reduce the molding shape between the elements (D) method of forming a metal sheet according to any one of claims 2 to 4, characterized in that finding.
　2-1 Step: required to elastically deform the shape of each element of the element data of the metal plate of the formed shape corresponding to the elements of the element data (A) of the temporary metal plate (B), wherein determining for each element of the element data (a) of the temporary metal plate stress (F1) to be applied to each element of the element data of the temporary metal plate (a).
　2-2 Step: each element of the element data of the temporary metal plate (A), the absolute value gives the stress (F1) or more stress (F2) obtained in the first 2-1 steps, each creating a finite element model providing the conditions for restraining the displacement of the out-of-plane direction of the nodes of the finite element (I).
　2-3 Step: the first 2-2 finite element model created in step (I) is carried out elastic deformation analysis using the finite element method based obtains element data after elastic deformation (H), the temporary of the shape of each finite element of the element data of the metal plate (a), modified to the shape of the finite elements of the finite element data after elastic deformation (H), the virtual before molding finite element data that fixes the step of the element data of the metal plate (D).
[Requested item 6]
　It said stress (F2), the absolute value of the stress (F1) than large and 1.5 times or less of the stress is the stress (F1)
　metal plate shaping method according to claim 5, wherein.
[Requested item 7]
　Stress (F3) necessary for elastic deformation to the shape of each element of the element data (B) of the metal plate of the formed shape corresponding to the elements of the element data (D) of the virtual metal plate before the molding, each element found for each of the element data of the virtual metal plate before the molding (D)
　wherein a is a part of the elements of the element data of the virtual metal plate before forming (D) required to the elastic deformation stress ( together give F3), giving the rest of the elements or stress giving a small stress absolute value than the stress (F3) necessary for the elastic deformation of the element data of the virtual metal plate before the molding (D) not create a finite element model (J),
　on the basis of the finite element model (J), by performing elastic deformation analysis by a finite element method,
　the element data (D) of the virtual metal plate before the molding one the elements of parts, the molding which corresponds to the part of element Jo of giving strain required to deform the shape of each element of the element data of the metal plate (B),
　wherein the remaining elements of the element data of the virtual metal plate before forming (D), the remaining elements without giving little or distortions give or distortion of absolute value than the strain required to deform the shape of each element of the element data of the metal plate of the molded shape corresponding (B), the
　deformation of a modified version of virtual metal plate obtaining the element data of the (G), after
the molding method of a metal plate according to any one of claims 2 to 6 that is characterized.
[Requested item 8]
　Of the remaining elements of the element data of the virtual metal plate before the molding (D), wherein the vicinity of the boundary elements and some elements gives a smaller stress than the absolute value of the stress (F3), the boundary neighborhood gradually absolute value decreases stress applied to the remaining elements as the distance from the elements
　metal plate shaping method according to claim 7.
[Requested item 9]
　After replacing the element data of the temporary metal plate element data of the virtual metal plate before the molding obtained in the second step (D) is in the first step (A), the first step and the performing the second step, or, according to any one of claims 2 to 8, characterized in that re determined element data of the virtual metal plate before molding by performing the second step (D) method of forming a metal plate.
[Requested item 10]
　The upper limit of the threshold value of the state variation before and after the molding of the corresponding elements between the element data of the element data of the virtual metal plate before molding (D) a metal plate of the molded shape (B) (ΔX), or, by setting a threshold and lower threshold of limit,
　if you set only upper threshold of the state variation ([Delta] X), up to a maximum value of the state variation ([Delta] X) becomes the following element data threshold,
　wherein the state change amount when setting the upper and lower thresholds of ([Delta] X), up to a maximum value and the minimum value of the state variation ([Delta] X) becomes equal to or less than a threshold and a lower threshold than the element data of the upper limit,
　the after replacing the element data (a) of the temporary metal plate in the first step the element data of the virtual metal plate (D) before the molding obtained in the second step, the first step and the second 2 steps or the first Method of forming a metal sheet according to any one of claims 2 to 9, characterized in that repeated to re determined element data of the virtual metal plate before molding by performing a two-step (D).
[Requested item 11]
　When molding the molded shape a metal plate by press molding, the metal plate sequentially forming a plurality of different intermediate shape from the molded shape, a molding method of metal plate formed into the molded shape from the last intermediate shape there are,
　among the plurality of obtaining the intermediate shape step and step of obtaining the molded shape, in the whole or part of the process, the resulting shape forming method according to any one of claims 1 to 10 , an intermediate shape molding in the previous step of the process, the molding process of the metal plate.
[Requested item 12]
　When molding the molded shape a metal plate by press molding, the molded into different intermediate shape metal plate molded shape, then the design method of the intermediate shape when molded into the molded shape from the intermediate shape a is,
　when molding the intermediate shape of the metal plate, is better in the case of molding from the metal plate into the molded shape through the intermediate shape than when molded directly into the molded shape, said metal plate shape when molded with the first region, and the intermediate shape sheet thickness reduction rate of at least part of a larger portion of the
　design method of the intermediate shape.
[Requested item 13]
　Based on the following first step and the following element data of the metal plate of the molded shape in the finite element analysis obtained by performing second and a step sequential (B) and element data of the virtual metal plate before forming (D) in,
　wherein the portion of the element corresponding to the first region of the element data of the virtual metal plate before forming (D), the metal plate of the forming shape corresponding to each element of the partial elements given strain required to deform the shape of each element of the element data (B),
　than the case of molding the molded shape through the intermediate shape of the element data of the virtual metal plate before the molding (D) the remaining elements corresponding to the second region it is comprising at least part of the sites thickness reduction ratio is large from the metal plate when directly molded into the molded shape from the metal plate, the remaining elements the metal of the mold shape corresponding to each element of Small strain without giving give or distortion of absolute value than the strain required to deform the shape of each element of the element data (B) of,
　after deformation of a modified version of a virtual metal plate before the molding the shape of the element data of the virtual metal plate (G) of the intermediate shape, the design method of the intermediate shape of claim 11, wherein.
　The first step: the step of providing a component data (A) and element data of the metal plate of the molded shape of the temporary metal plate (B).
　The second step: the temporary metal so that the difference in shape between the elements topologically corresponding decrease of element data of the metal plate element data (A) and the molded shape of the temporary metal plate (B) steps to modify the element data of the plate (a) determine the element data of the virtual metal plate before forming (D).
[Requested item 14]
　The first step is the forming analysis by the finite element method, on the basis of the element data (A) of the temporary metal plate, obtaining the element data of the metal plate of the molded shape (B)
　an intermediate shape of claim 13, wherein design method.
[Requested item 15]
　The first step is the inverse analysis by the finite element method, based on the element data of the metal plate of the molded shape (B), obtains the element data (A) of the temporary metal plate
　intermediate of claim 13, wherein a method of designing a shape.
[Requested item 16]
　In the second step, following the 2-1 step, by sequentially performing the first 2-2 steps and 2-3 step following below,
　the metal plate element data (A) and the molded shape of the temporary metal plate of the element data (B), the corresponding element data in the virtual metal plate before the difference is to modify the element data of the temporary metal plate (a) so as to reduce the molding shape between the elements (D) design method of the intermediate shape according to any one of claims 13 to claim 15, characterized in that finding.
　2-1 Step: each element topologically corresponding element data of said temporary metal plate (A)
required to elastically deform the shape of each element of the element data of the metal plate of the molded shape (B) Do, determining for each element of the element data (a) of the temporary metal plate stress (F1) to be applied to each element of the element data of the temporary metal plate (a).
　2-2 Step: each element of the element data of the temporary metal plate (A), the absolute value gives the stress (F1) or more stress (F2) obtained in the first 2-1 steps, each creating a finite element model providing the conditions for restraining the displacement of the out-of-plane direction of the nodes of the finite element (I).
　2-3 Step: the first 2-2 finite element model created in step (I) is carried out elastic deformation analysis using the finite element method based obtains element data after elastic deformation (H), the temporary of the shape of each finite element of the element data of the metal plate (a), modified to the shape of the finite elements of the finite element data after elastic deformation (H), the virtual before molding finite element data that fixes the step of the element data of the metal plate (D).
[Requested item 17]
　It said stress (F2), the absolute value is 1.5 times or less of the stress of the stress (F1) than large and the stress (F1)
　method for designing an intermediate form of claim 16, wherein.
[Requested item 18]
　Stress (F3) necessary for elastic deformation to the shape of each element of the element data (B) of the metal plate of the formed shape corresponding to the elements of the element data (D) of the virtual metal plate before the molding, each element found for each of the element data of the virtual metal plate before the molding (D)
　wherein a is a part of the elements of the element data of the virtual metal plate before forming (D) required to the elastic deformation stress ( together give F3), giving the rest of the elements or stress giving a small stress absolute value than the stress (F3) necessary for the elastic deformation of the element data of the virtual metal plate before the molding (D) not create a finite element model (J),
　on the basis of the finite element model (J), by performing elastic deformation analysis by a finite element method,
　the element data (D) of the virtual metal plate before the molding one the elements of parts, the molding which corresponds to the part of element Jo of giving strain required to deform the shape of each element of the element data of the metal plate (B),
　wherein the remaining elements of the element data of the virtual metal plate before forming (D), the remaining elements without giving little or distortions give or distortion of absolute value than the strain required to deform the shape of each element of the element data of the metal plate of the molded shape corresponding (B), the
　deformation of a modified version of virtual metal plate obtaining the element data (G) of, after
design method of the intermediate shape according to any one of claims 13 to claim 17, characterized in that.
[Requested item 19]
　Of the remaining elements of the element data of the virtual metal plate before the molding (D), wherein the vicinity of the boundary elements and some elements gives a smaller stress than the absolute value of the stress (F3), the boundary neighborhood It gives the gradually absolute value decreases stress to the remaining elements as the distance from the element
　design method of the intermediate shape of claim 18, wherein.
[Requested item 20]
　After replacing the element data of the temporary metal plate element data of the virtual metal plate before the molding obtained in the second step (D) is in the first step (A), the first step and the performing the second step, or, according to any one of claims 13 to claim 19, characterized in that re determined element data of the virtual metal plate before molding by performing the second step (D) design method of the intermediate shape.
[Requested item 21]
　State variation before and after the molding of each finite element corresponding topologically between the element data (D) and element data of the metal plate of the molded shape (B) of the virtual metal plate before the molding of the ([Delta] X) the upper limit of the threshold or, to set a threshold and lower threshold of limit,
　the upper limit when only the specified threshold value of the state variation component maximum value is below the threshold value of ([Delta] X) data of the state change amount ([Delta] X) in until,
　if you set the upper and lower thresholds of the state variation ([Delta] X), the state change amounts to the maximum value and the minimum value is equal to or less than the threshold value of the upper and lower thresholds or more element data of ([Delta] X) until,
　after replacing the element data of the temporary metal plate element data of the virtual metal plate (D) before the resulting molding in the second step in the first step (a), the first step and the second scan Intermediate shape according to any one of claims 13 to claim 19 and repeating that step or by performing the second step again determined element data of the virtual metal plate before forming (D) design method.
[Requested item 22]
　When molding the molded shape a metal plate by press molding, the metal plate sequentially forming a plurality of different intermediate shapes and the forming shape, the last intermediate shape of the intermediate shape when molded into the molded shape in the design process,
　among the plurality of obtaining the intermediate shape step and step of obtaining the molded shape, in the whole or part step, the shape obtained by the designing method according to any one of claims 12-21 and an intermediate shape molding in the previous step of the process, the design method of the intermediate shape.
[Requested item 23]
　The resulting intermediate shape in the forming method of a metal plate according to any one of claims 1 to 11, the molding die of the metal plate, characterized in that it comprises the shape of the die face.
[Requested item 24]
　When molding the molded shape a metal plate by press molding, the metal plate shaped into different intermediate shape from the molded shape, and then to design the intermediate shape when molded into the molded shape from the intermediate shape a computer program for,
　the computer,
　when molding the intermediate shape of the metal plate, if molded into the molded shape through the intermediate shape than when molded directly into the molded shape from the metal plate who is, the shape in the case of forming the first region including at least part of the sites thickness reduction ratio is large from the metal plate, the step of the intermediate shape
　computer for executing the processing including program .
[Requested item 25]
　In the finite element analysis, the element data of the temporary metal plate (A), element data of a metal plate forming a shape corresponding to the element data (A) of the temporary metal plate (B) on the basis of
　the following by successively performing 2-1 steps and following the 2-2 step,
　the difference in shape between the elements of the element data of the metal plate element data (a) and the molded shape of the temporary metal plate (B) finite element model for the elastic deformation analysis by a finite element method for obtaining a correct the element data of the temporary metal plate (a) so that the smaller element data of the virtual metal plate before forming (D) claim 24, wherein the computer program includes creating a (I).
　2-1 Step: The respective elements of the element data (A) of the temporary metal plate, necessary to elastically deform the shape of each element of the element data of the metal plate of the molded shape (B), the provisional of determining for each element of the element data (a) of the temporary metal plate stress (F1) to be applied to each element of the element data of the metal plate (a).
　2-2 Step: each element of the element data of the temporary metal plate (A), the absolute value gives the stress (F1) or more stress (F2) obtained in the first 2-1 steps, each creating a finite element model providing the conditions for restraining the displacement of the out-of-plane direction of the nodes of the finite element (I).
[Requested item 26]
　In the finite element analysis, based on the element data of the temporary metal plate (A) and the element data (A) of the temporary metal plate element data of the metal plate of topologically-phase molded shape (B),
　the following the 2-1 step, by sequentially performing the first 2-2 steps and following 2-3 step below,
　the topology of the element data of the metal plate element data (a) and the molded shape of the temporary metal plate (B) claims, including determining the element data (D) of the virtual metal plate before molding by modifying the element data (a) of the temporary metal plate so that the difference in shape between the elements is reduced to respond to specific 24, wherein the computer program.
　2-1 Step: each element topologically corresponding element data of said temporary metal plate (A)
required to elastically deform the shape of each element of the element data of the metal plate of the molded shape (B) Do, determining for each element of the element data (a) of the temporary metal plate stress (F1) to be applied to each element of the element data of the temporary metal plate (a).
　2-2 Step: each element of the element data of the temporary metal plate (A), the absolute value gives the stress (F1) or more stress (F2) obtained in the first 2-1 steps, each creating a finite element model providing the conditions for restraining the displacement of the out-of-plane direction of the nodes of the finite element (I).
　2-3 Step: perform elastic deformation analysis using the finite element method based on the finite element model (I), obtains the element data after elastic deformation (H), the element data of the temporary metal plate (A) each shape of the finite element, modified to a shape of each finite element of the finite element data after elastic deformation (H), finite element data and element data of the virtual metal plate before forming (D) that fixes the step to.
[Requested item 27]
　It said stress (F2), the absolute value is 1.5 times or less of the stress of the stress (F1) than large and the stress (F1)
　according to claim 25 or claim 26, wherein the computer program.
[Requested item 28]
　Based on finite element analysis, the element data of the virtual metal plate before forming (D), element data of a metal plate forming a shape corresponding to the element data (D) of the virtual metal plate before the molding (B) to,
　each element of the element data of the virtual metal plate (D) before the molding element data of the metal plate of the formed shape corresponding to the elements of the element data of the virtual metal plate before the molding (D) (B ) determine the stress (F3) necessary for the shape to the elastic deformation of each element of each element,
　the portion corresponding to the first region of the element data of the virtual metal plate before forming (D) the metal than the elements forming the with stressing (F3) necessary for elastic deformation, the molded shape through the intermediate shape of the element data of the virtual metal plate before the molding (D) the metal plate is more in the case of molded directly from the plate to the formed shape Rest of the elements or stress giving a small stress absolute value than the stress (F3) necessary for the elastic deformation corresponding to the second region including at least part of the site et plate thickness reduction ratio is large computer program according to any one of claims 25 to claim 27, including creating a finite element model (J) which does not give.
[Requested item 29]
　Based on the finite element model (J), by performing elastic deformation analysis by a finite element method,
　a portion corresponding to the first region of the element data of the virtual metal plate before forming (D) the element the given part of the elements of the strain required to deform the shape of each element of the element data of the metal plate of the molded shape corresponding to each element (B),
　the pre-forming of the virtual metal plate the remaining elements corresponding to the second region of the element data of (D), the shape of each element of the element data of the metal plate molded shape (B) corresponding to each element of the remaining elements deformation without giving or strain gives a small strain of absolute value than the strain necessary for,
　the determined element data of the virtual metal plate after deformation when the deforming the virtual metal plate before forming (G) ,
according to claim 28, further comprising the computer pro Lamb.
[Requested item 30]
　Of the remaining elements of the element data of the virtual metal plate before the molding (D), wherein the vicinity of the boundary elements and some elements gives a smaller stress than the absolute value of the stress (F3), the boundary neighborhood It gives the gradually absolute value becomes smaller stress as the distance from the element to the remaining elements
　according to claim 28 or claim 29, wherein the computer program.
[Requested item 31]
　By forming analysis by the finite element method, a first step of obtaining the element data of the temporary metal plate in molding a temporary metal plate molded shape (A), element data of the metal plate of the molded shape (B) ,
　on the basis of the finite element model (J), by performing elastic deformation analysis by a finite element method, a third step of said intermediate shape
　one of claims 28 to 30 for executing the computer program according to an item.
[Requested item 32]
　After replacing the element data of the temporary metal plate element data of the virtual metal plate before the molding obtained in the first 2-3 steps (D) in the first step (A), the first step ~ the first 2-3 steps, or, to be executed in that the first 2-1 sequentially performing steps - the first 2-3 step again determined element data of the virtual metal plate before forming (D) to the computer the computer program of claim 31, wherein.
[Requested item 33]
　The upper limit of the threshold value of the state variation before and after the molding of the corresponding elements between the element data of the element data of the virtual metal plate before molding (D) a metal plate of the molded shape (B) (ΔX), or, by setting a threshold and lower threshold of limit,
　if you set only upper threshold of the state variation ([Delta] X), up to a maximum value of the state variation ([Delta] X) becomes the following element data threshold,
　wherein the state change amount when setting the upper and lower thresholds of ([Delta] X), up to a maximum value and the minimum value of the state variation ([Delta] X) becomes equal to or less than a threshold and a lower threshold than the element data of the upper limit,
　the after replacing the element data (a) of the temporary metal plate in the first step the element data of the virtual metal plate (D) before the molding obtained in 2-3 step, the first step - the 2-3 step or Computer according to claim 31 or claim 32 and repeating that again obtains the element data of the virtual metal plate (D) before molding by performing the first 2-1 steps - the 2-3 step program.
[Requested item 34]
　In forming a metal plate to press forming to molded shape, the intermediate shape when the metal plates are sequentially formed into a plurality of different intermediate shape from the molded shape is formed into the molded shape from the last intermediate shape a computer program for determining,
　in the computer,
　replacing the shape determined in the computer program according to any one of claims 31 to claim 33 in an intermediate shape, the third step sequentially from the first step computer program according to any one of claims 31 to claim 33 carried out.
[Requested item 35]
　Computer readable recording medium recording the computer program according to any one of claims 24 to claim 34.