Method of identification of cause and/or location of cause of occurrence of springback

Abstract

An apparatus for identification of a cause of occurrence of springback having a press forming analyzer for numerically analyzing forming conditions of press forming to obtain forming data of a press formed part, a springback analyzer for numerically analyzing said forming data to calculate a springback value, and a processor for processing at least one of a physical property value and physical property quantity data of part of the regions of said press formed part among forming data of said press formed part and making said springback analyzer calculate the springback value based on the results of said processing.

What is claimed is: 
     
         1 . An apparatus for identification of a cause of occurrence of springback having
 a press forming analyzer for numerically analyzing forming conditions of press forming to obtain forming data of a press formed part,
 a springback analyzer for numerically analyzing said forming data to calculate a springback value, and 
 a processor for processing at least one of a physical property value and physical property quantity data of part of the regions of said press formed part among forming data of said press formed part and making said springback analyzer calculate the springback value based on the results of said processing. 
   
     
     
         2 . An apparatus for identification of a cause of occurrence of springback as set forth in  claim 1 , wherein said physical property value and physical property quantity are a sheet thickness, modulus of elasticity, modulus of plasticity, stress component values, and strain component values. 
     
     
         3 . An apparatus for identification of a cause of occurrence of springback as set forth in  claim 1 , wherein said processor repeatedly calculates the results of said processing and springback value while changing said part of the regions so as to identify a region, physical property value, and physical property quantity where said springback value becomes the smallest or where the difference with the springback value when performing the springback analysis while not performing said processing becomes the largest. 
     
     
         4 . An apparatus for identification of a cause of occurrence of springback as set forth in  claim 1 , wherein said processor repeatedly calculates the results of said processing and springback value while changing said physical property value and physical property quantity and/or said processing so as to identify a region, physical property value, and physical property quantity where said springback value becomes the smallest or where the difference with the springback value when performing the springback analysis while not performing said processing becomes the largest. 
     
     
         5 . An apparatus for identification of a cause of occurrence of springback as set forth in  claim 1 , wherein said part of the regions is a plurality of regions and these regions are simultaneously processed. 
     
     
         6 . An apparatus for identification of a cause of occurrence of springback as set forth in  claim 1 , wherein said processor divides a part into regions where said springback value becomes the smallest and processes said divided regions for at least one of said physical property value and physical property quantity until the size of the divided regions becomes a predetermined value or less. 
     
     
         7 . A computer readable storage medium to store a program for identification of a cause of occurrence of springback characterized by making a computer execute
 a press forming analysis procedure for numerically analyzing forming conditions of press forming to obtain forming data of a press formed part,   a processing procedure for processing at least one of a physical property value and physical property quantity data of part of the regions of said press formed part among forming data of said press formed part, and   a springback value calculation procedure for calculating a springback value based on the results of said processing.   
     
     
         8 . A computer readable storage medium to store a program for identification of a cause of occurrence of springback as set forth in  claim 7 , wherein said physical property value and physical property quantity are a sheet thickness, modulus of elasticity, modulus of plasticity, stress component values, and strain component values. 
     
     
         9 . A computer readable storage medium to store a program for identification of a cause of occurrence of springback as set forth in  claim 7 , which has a procedure repeating said processing procedure and said springback value calculation procedure while changing said part of the regions so as to identify a region, physical property value, and physical property quantity where said springback value becomes the smallest or where the difference with the springback value when performing the springback analysis while not performing said processing becomes the largest. 
     
     
         10 . A computer readable storage medium to store a program for identification of a cause of occurrence of springback as set forth in  claim 7 , which has a procedure repeating said processing procedure and said springback value calculation procedure while changing at least one of said physical property value and physical property quantity and said processing so as to identify a region, physical property value, and physical property quantity where said springback value becomes the smallest or where the difference with the springback value when performing the springback analysis while not performing said processing becomes the largest. 
     
     
         11 . A computer readable storage medium to store a program for identification of a cause of occurrence of springback as set forth in  claim 7 , wherein said part of the regions is a plurality of regions and these regions are simultaneously processed. 
     
     
         12 . A computer readable storage medium to store a program for identification of a cause of occurrence of springback as set forth in  claim 7 , wherein said processing procedure is a procedure which divides a part into regions where said springback value becomes the smallest and processes said divided regions for at least one of said physical property value and physical property quantity until the size of the divided regions becomes a predetermined value or less. 
     
     
         13 . A computer readable storage medium to store a program for identification of a location of a cause of occurrence of springback able to input and output data with a numerical analysis program, which numerical analysis program numerically analyzing forming conditions of press forming to calculate forming data of press forming and a springback value,
 said program for identification of the location of a cause of occurrence of springback characterized by making a computer execute   a procedure for acquiring said forming data from said numerical analysis program,   a procedure for processing at least one of a physical property value and physical property quantity data of part of the regions of said press formed part among forming data of said press formed part, and   a procedure for outputting the results of said processing to said numerical analysis program and calculating said springback value procedure.   
     
     
         14 . A computer readable storage medium to store a program for identification of a cause of occurrence of springback as set forth in  claim 13 , which has a procedure repeating said processing procedure and said springback value calculation procedure while changing said part of the regions so as to identify a region, physical property value, and physical property quantity where said springback value becomes the smallest or where the difference with the springback value when performing the springback analysis while not performing said processing becomes the largest. 
     
     
         15 . A computer readable storage medium to store a program for identification of a cause of occurrence of springback as set forth in  claim 13 , which has a procedure repeating said processing procedure and said springback value calculation procedure while changing at least one of said physical property value and physical property quantity and said processing so as to identify a region, physical property value, and physical property quantity procedure where said springback value becomes the smallest or where the difference with the springback value when performing the springback analysis while not performing said processing becomes the largest. 
     
     
         16 . An apparatus for identification of a cause of occurrence of springback characterized by comprising
 a press forming analyzer numerically analyzing forming conditions of press forming to obtain forming data of a press formed part,   a processor calculating a curvature and/or angle for said press formed part in forming data of said press formed part, dividing the formed article into regions based on said curvature and/or angle, and processing at least one of a physical property value and physical property quantity variable at part of the regions from among the divided regions judged to be processed based on said forming data, and   a springback analyzer calculating a springback value based on the results of said processing.   
     
     
         17 . An apparatus for identification of a cause of occurrence of springback as set forth in  claim 16 , wherein the physical property value and physical property quantity at said divided region where said curvature and/or angle is relatively large is said physical property value and physical property quantity of at least one integration point of a divided region where said curvature and/or angle is relatively large. 
     
     
         18 . An apparatus for identification of a cause of occurrence of springback as set forth in  claim 16 , wherein said physical property value and physical property quantity are a sheet thickness, modulus of elasticity, modulus of plasticity, stress component values, and strain component values. 
     
     
         19 . An apparatus for identification of a cause of occurrence of springback as set forth in  claim 16 , wherein said processor and said springback analyzer repeatedly calculate the results of said processing and springback value while changing said part of the regions so that said processor identifies said region, physical property value, and physical property quantity where said springback value becomes the smallest. 
     
     
         20 . An apparatus for identification of a cause of occurrence of springback as set forth in  claim 16 , wherein said processor and said springback analyzer repeatedly calculate the results of said processing and springback value while changing at least one of said physical property value and physical property quantity and/or said processing so that said processor identifies said region, physical property value, and physical property quantity where said springback value becomes the smallest. 
     
     
         21 . A computer readable storage medium to store a program for identification of a cause of occurrence of springback characterized by making a computer execute
 a press forming analysis procedure for numerically analyzing forming conditions of press forming to obtain forming data of a press formed part,   a processing procedure for calculating a curvature and/or angle for said press formed part in forming data of said press formed part, dividing the formed article into regions based on said curvature and/or angle, and processing at least one of a physical property value and physical property quantity at part of the regions from among the divided regions judged to be processed based on said forming data, and   a procedure for calculating a springback value based on the results of said processing springback value calculation procedure.   
     
     
         22 . A computer readable storage medium to store a program for identification of a cause of occurrence of springback as set forth in  claim 21 , wherein said processing procedure processes at least one of said physical property value and physical property quantity variable of at least one of the integration points of said divided region where said curvature and/or angle is relatively large. 
     
     
         23 . A computer readable storage medium to store a program for identification of a cause of occurrence of springback able to input and output data with a numerical analysis program, said numerical analysis program numerically analyzing forming conditions of press forming to calculate forming data of press forming and a springback value,
 said program for identification of a cause of occurrence of springback making a computer execute   a procedure for acquiring said forming data from said numerical analysis program,   a procedure for calculating a curvature and/or angle for said press formed part in forming data of said press formed part, dividing the formed article into regions based on said curvature and/or angle, and processing at least one of physical property value and physical property quantity at part of the regions from among the divided regions judged to be processed based on said forming data, and   a procedure for outputting the results of said processing to said numerical analysis program and calculating said springback value.   
     
     
         24 . A computer readable storage medium to store a program for identification of a cause of occurrence of springback as set forth in  claim 23 , wherein said processing procedure processes at least one variable of said physical property value and physical property quantity variables of the integration points of said divided region where said curvature and/or angle is relatively large. 
     
     
         25 . An apparatus for display of a degree of effect of springback characterized by having
 a press forming analyzer numerically analyzing forming conditions of press forming to obtain forming data of a press formed part,   a springback analyzer numerically analyzing said forming data to calculate a springback value,   a processor processing at least one of a physical property value and physical property quantity data of each region dividing said press formed part in forming data of said press formed part and making said springback analyzer calculate a springback value based on results of said processing, and   a display unit displaying said calculated springback value for each said region.   
     
     
         26 . An apparatus for display of a degree of effect of springback as set forth in  claim 25 , wherein said processor processes at least one of a physical property value and physical property quantity data of part of the integration points of each region dividing said press formed part in forming data of said press formed part. 
     
     
         27 . An apparatus for display of a degree of effect of springback as set forth in  claim 25 , wherein said display unit displays by a contour diagram said calculated springback value for each said region. 
     
     
         28 . An apparatus for display of a degree of effect of springback as set forth in  claim 25 , wherein said physical property value and physical property quantity are a sheet thickness, modulus of elasticity, modulus of plasticity, stress component values, and strain component values. 
     
     
         29 . An apparatus for display of a degree of effect of springback as set forth in  claim 25 , wherein said display unit displays the value of said calculated springback value divided by the area of each said region on said display unit for each said region. 
     
     
         30 . An apparatus for display of a degree of effect of springback as set forth in  claim 25 , wherein said display unit displays the value of said calculated springback value divided by one of a representative length, representative width, representative height, representative sheet thickness, and tensile strength of said press formed part on said display unit for each said region. 
     
     
         31 . An apparatus for display of a degree of effect of springback as set forth in  claim 25 , wherein said display unit displays the value of said calculated springback value divided by a punch speed or blank holding force on said display unit for each said region. 
     
     
         32 . A computer readable storage medium to store a program for display of a degree of effect of springback characterized by making a computer execute
 a press forming analysis procedure for numerically analyzing forming conditions of press forming to obtain forming data of a press formed part,   a processing procedure for processing at least one of a physical property value and physical property quantity data of each region dividing said press formed part in forming data of said press formed part,   a springback value calculation procedure for calculating a springback value based on the results of said processing, and   a display procedure for displaying said calculated springback value on a display unit for each said region.   
     
     
         33 . A computer readable storage medium to store a program for display of a degree of effect of springback as set forth in  claim 32 , wherein said processing procedure processes at least one of a physical property value and physical property quantity data of part of the integration points of each region dividing said press formed part in forming data of said press formed part. 
     
     
         34 . A computer readable storage medium to store a program for display of a degree of effect of springback as set forth in  claim 32 , wherein said display procedure displays by a contour diagram said calculated springback value for each said region. 
     
     
         35 . A computer readable storage medium to store a program for display of a degree of effect of springback as set forth in  claim 32 , wherein said display procedure is a procedure for displaying the value of said calculated springback value divided by the area of each said region for each said region. 
     
     
         36 . A computer readable storage medium to store a program for display of a degree of effect of springback as set forth in  claim 32 , wherein said display procedure is a procedure for displaying the value of said calculated springback value divided by one of a representative length, representative width, representative height, representative sheet thickness, and tensile strength of said press formed part for each said region. 
     
     
         37 . A computer readable storage medium to store a program for display of a degree of effect of springback as set forth in  claim 32 , wherein said display procedure is a procedure for displaying the value of said calculated springback value divided by a punch speed or blank holding force for each said region. 
     
     
         38 . A computer readable storage medium to store a program for display of a degree of effect of springback able to input and output data with a press forming analysis program numerically analyzing foiming conditions of press forming to calculate forming data of a press formed part, a springback analysis program numerically analyzing said forming data to calculate a springback value, and a post processing program displaying by a contour diagram said springback value,
 said program for display of a cause of occurrence of springback characterized by making a computer execute   a procedure for acquiring said forming data from said press forming analysis program,   a processing procedure for processing at least one of a physical property value and physical property quantity data of each region dividing said press formed part in said forming data,   a procedure for outputting the results of said processing to said springback analysis program, and   a contour display procedure for making said post processing program display by a contour diagram said springback value calculated by said springback analysis program for each region.   
     
     
         39 . A computer readable storage medium to store a program for display of a cause of occurrence of springback as set forth in  claim 38 , wherein said processing procedure processes at least one of a physical property value and physical property quantity data of part of the integration points of each region dividing said press formed part in forming data of said press formed part. 
     
     
         40 . An apparatus for identification of a location of a cause of occurrence of springback characterized by having:
 a press forming analyzer numerically analyzing forming conditions of press forming to obtain forming data of a press formed part,   a springback analyzer numerically analyzing said forming data to calculate a springback value, and   a processor performing processing for processing of at least one of a physical property value and physical property quantity data of that region when at least one of said physical property value and physical property quantity is larger than a predetermined value and making said springback analyzer calculate a springback value for each of a plurality of regions after springback based on the results of said processing.   
     
     
         41 . An apparatus for identification of a location of a cause of occurrence of springback as set forth in  claim 40 , wherein said processor processes at least one of a physical property value and physical property quantity data of a region when there is a region where a difference of at least one of a physical property value and physical property quantity data of the press formed part before and after springback is larger than a predetermined value. 
     
     
         42 . An apparatus for identification of a location of a cause of occurrence of springback as set forth in  claim 40 , wherein said physical property value and physical property quantity are a sheet thickness, modulus of elasticity, modulus of plasticity, stress component values, and strain component values. 
     
     
         43 . A computer readable storage medium to store a program for identification of a location of a cause of occurrence of springback characterized by making a computer execute
 a press forming analysis procedure for numerically analyzing forming conditions of press forming to obtain forming data of a press formed part,   a first springback value calculation procedure for calculating a physical property value and physical property quantity data for each of a plurality of regions after springback based on forming data of said press formed part,   a processing procedure for processing at least one of a physical property value and physical property quantity data of a region when there is a region where at least one said physical property value and physical property quantity is larger than a predetermined value, and   a second springback value calculation procedure for calculating the physical property value and physical property quantity data for each of a plurality of regions after springback based on the results of said processing.   
     
     
         44 . A computer readable storage medium to store a program for identification of a location of a cause of occurrence of springback as set forth in  claim 43 , wherein said processing procedure processes at least one of a physical property value and physical property quantity data of a region when there is a region where a difference of at least one of a physical property value and physical property quantity data of a press formed part before and after springback is larger than a predetermined value. 
     
     
         45 . A computer readable storage medium to store a program for identification of a location of a cause of occurrence of springback able to input and output data with a press forming analysis program numerically analyzing forming conditions of press forming to calculate forming data of a press formed part and a physical property value and physical property quantity data for each of a plurality of regions and a springback analysis program numerically analyzing said forming data and a physical property value and physical property quantity data for each of a plurality of regions to calculate a springback value and a physical property value and physical property quantity data for each of a plurality of regions after springback,
 said program for identification of the location of a cause of occurrence of springback characterized by making a computer execute   a procedure for acquiring a physical property value and physical property quantity data for each of a plurality of regions after springback from said springback analysis program,   a processing procedure for processing at least one of a physical property value and physical property quantity data of a region when there is a region where at least one of said physical property value and physical property quantity is larger than a predetermined value, and   a procedure for outputting the results of said processing to said springback analysis program.   
     
     
         46 . A computer readable storage medium to store a program for identification of a location of a cause of occurrence of springback as set forth in  claim 45 ,
 further having a procedure for acquiring a physical property value and physical property quantity data for each of a plurality of regions before said springback from said press forming analysis program,   said processing procedure processing at least one of a physical property value and physical property quantity data of a region when there is a region where a difference of at least one of a physical property value and physical property quantity data of said press formed part before and after springback is larger than a predetermined value.   
     
     
         47 . A computer readable storage medium to store a program for identification of a location of a cause of occurrence of springback as set forth in  claim 45 , wherein said physical property value and physical property quantity are a sheet thickness, modulus of elasticity, modulus of plasticity, stress component values, and strain component values. 
     
     
         48 . An apparatus for identification of a location of a cause of occurrence of springback characterized by having:
 a press forming analyzer numerically analyzing first forming conditions to calculate first forming data and numerically analyzing second forming conditions differing in at least one of said first forming conditions to calculate second forming data,   a springback analyzer numerically analyzing said forming data to calculate a springback value, and   a processor processing at least one of a physical property value and physical property quantity of said first forming data of a region when there is a region where a difference of at least one of a physical property value and physical property quantity data in physical property value and physical property quantity data for each of a plurality of regions of said first and second forming data is larger than a predetermined value and making said springback analyzer calculate a springback value based on results of said processing.   
     
     
         49 . An apparatus for identification of a location of a cause of occurrence of springback as set forth in  claim 48 , wherein said forming conditions are a form and properties of steel sheet, tooling form, and press conditions. 
     
     
         50 . An apparatus for identification of a location of a cause of occurrence of springback as set forth in  claim 48 , wherein said physical property value and physical property quantity are a sheet thickness, modulus of elasticity, modulus of plasticity, stress component values, and strain component values. 
     
     
         51 . A computer readable storage medium to store a program for identification of a location of a cause of occurrence of springback making a computer execute
 a first press forming analysis procedure for numerically analyzing first forming conditions to calculate first forming data,   a second press forming analysis procedure for numerically analyzing second forming conditions differing in at least one of said first forming conditions to calculate second forming data,   a procedure for processing at least one of a physical property value and physical property quantity of said first forming data of a region when there is a region where a difference of at least one of a physical property value and physical property quantity data in physical property value and physical property quantity data for each of a plurality of regions of said first and second forming data is larger than a predetermined value, and   a springback value calculation procedure for calculating a springback value based on the results of said processing.   
     
     
         52 . A computer readable storage medium to store a program for identification of a location of a cause of occurrence of springback able to input and output data with a press forming analysis program numerically analyzing forming conditions of press forming to calculate forming data of a press formed part and a physical property value and physical property quantity data for each of a plurality of regions and a numerical analysis program numerically analyzing said forming data and a physical property value and physical property quantity data for each of a plurality of regions and calculating a springback value and a physical property value and physical property quantity data for each of a plurality of regions after springback,
 said program for identification of the location of a cause of occurrence of springback making a computer execute   a procedure for acquiring first forming data from said press forming analysis program,   a procedure for numerically analyzing second forming conditions differing in at least one of said first forming conditions and acquiring second forming data from said press forming analysis program,   a procedure for processing at least one of a physical property value and physical property quantity of said first forming data of a region when there is a region where a difference of at least one of a physical property value and physical property quantity data in physical property value and physical property quantity data for each of a plurality of regions of said first and second forming data is larger than a predetermined value, and   a procedure for outputting the results of said processing to said springback analysis program.   
     
     
         53 . A computer readable storage medium to store a program for identification of a location of a cause of occurrence of springback as set forth in  claim 52 , wherein said forming conditions are a form and properties of steel sheet, tooling form, and press conditions. 
     
     
         54 . A computer readable storage medium to store a program for identification of a location of a cause of occurrence of springback as set forth in  claim 52 , wherein said physical property value and physical property quantity are a sheet thickness, modulus of elasticity, modulus of plasticity, stress component values, and strain component values. 
     
     
         55 . A method of identification of a position of a measure against springback characterized by having:
 a press forming analysis step of numerically analyzing form conditions of a press formed part to calculate forming data of a press formed part,   a substitute forming data generation step of selecting at least part of the regions of the press formed part in the forming data of the press formed part and calculating substitute forming data substituting predetermined data for at least one of the form of that selected region and the stress distribution of that selected region, and   a springback value calculation step of numerically analyzing said substitute forming data to calculate a springback value.   
     
     
         56 . A method of identification of a position of a measure against springback as set forth in  claim 55 , which repeats said substitute forming data generation step and said springback value calculation step while changing the position or number of said selected regions. 
     
     
         57 . A method of identification of a position of a measure against springback as set forth in  claim 55 , further having a step of judging if said springback value is a predetermined value or less. 
     
     
         58 . A method of identification of a position of a measure against springback as set forth in  claim 55 , wherein said substitute forming data generation step substitutes said substrated predetermined data for at least one of the form of one or more regions giving a springback value of a predetermined value or less and the stress distribution of that selected region and wherein the method repeats said substitute forming data generation step and said springback value calculation step while changing the position or number of said selected regions. 
     
     
         59 . A method of identification of a position of a measure against springback as set forth in  claim 55 , wherein
 the method further has a step of dividing forming data of said press formed part into predetermined regions, and   said substitute forming data generation step calculates said substitute forming data for all regions divided into said predetermined regions.   
     
     
         60 . A method of identification of a position of a measure against springback as set forth in  claim 55 , wherein said predetermined data differs in at least one of the form and stress distribution for each said selected region. 
     
     
         61 . An apparatus for identification of a position of a measure against springback, characterized by having:
 a press forming analyzer numerically analyzing forming conditions of a press formed part to calculate forming data of the press formed part,   a substitute forming data generator selecting at least part of the regions of the press formed part in the forming data of the press formed part and calculating substitute forming data substituting predetermined data for at least one of the form of that selected region and the stress distribution of that selected region, and   a springback analyzer numerically analyzing said substitute forming data to calculate a springback value.   
     
     
         62 . An apparatus for identification of a position of a measure against springback as set forth in  claim 61 , wherein said substitute forming data generator calculates said substitute forming data and said springback analyzer repeatedly calculates the springback value while changing the position and number of said selected regions. 
     
     
         63 . An apparatus for identification of a position of a measure against springback as set forth in  claim 61 , wherein said substitute forming data generator judges if said springback value has become a predetermined value or less. 
     
     
         64 . An apparatus for identification of a position of a measure against springback as set forth in  claim 63 , wherein said substitute forming data generator substitutes the substituted predetermined data for at least one of the form of one or more regions giving a springback value of a predetermined value or less and the stress distribution of that selected region and wherein said substitute forming data generator calculates said substitute forming data and said springback analyzer repeatedly calculates the springback value while changing the position or number of said selected regions. 
     
     
         65 . An apparatus for identification of a position of a measure against springback as set forth in  claim 61 , wherein said substitute forming data generator divides forming data of said press formed part by predetermined regions and generates said substitute forming data for all of the regions divided by said predetermined regions. 
     
     
         66 . An apparatus for identification of a position of a measure against springback as set forth in  claim 61 , wherein said predetermined data differs in at least one of a form and stress distribution for each said selected region. 
     
     
         67 . A computer readable storage medium to store a program for identification of a position of a measure against springback making a computer execute:
 a press forming analysis procedure for numerically analyzing forming conditions of a press formed part to calculate forming data of a press formed part,   a substitute forming data generating procedure for selecting at least part of the regions of a press formed part in forming data of a press formed part and calculating substitute forming data substituting predetermined data for at least one of a form of that selected region and a stress distribution of that selected region, and   a springback value calculation procedure for numerically analyzing said substitute forming data to calculate a springback value.   
     
     
         68 . A computer readable storage medium to store a program for identification of a position of a measure against springback as set forth in  claim 67 , which repeats said substitute forming data generating procedure and said springback value calculation procedure while changing the position and number of said selected regions. 
     
     
         69 . A computer readable storage medium to store a program for identification of a position of a measure against springback as set forth in  claim 67  further having a procedure for judging wherein said springback value is a predetermined value or less. 
     
     
         70 . A computer readable storage medium to store a program for identification of a position of a measure against springback as set forth in  claim 67  wherein said substitute forming data generating procedure substitutes the substituted predetermined data for at least one of the form of one or more regions giving a springback value of a predetermined value or less and the stress distribution of that selected region and wherein the program repeats said substitute forming data generating procedure and said springback value calculation procedure while changing the position or number of said selected regions. 
     
     
         71 . A computer readable storage medium to store a program for identification of a position of a measure against springback as set forth in  claim 67 , wherein
 the program further has a procedure dividing forming data of said press formed part by predetermined regions, and   said substitute forming data generating procedure generates said substitute forming data for all of the regions divided by said predetermined regions.   
     
     
         72 . A computer readable storage medium to store a program for identification of a position of a measure against springback as set forth in  claim 67 , wherein said predetermined data differs in at least one of a form and stress distribution for each said selected region. 
     
     
         73 . A computer readable storage medium to store a program for identification of a position of a measure against springback able to input and output data with a press forming analysis program numerically analyzing forming conditions of press forming to calculate forming data of a press formed part and a springback analysis program numerically analyzing
 said forming data to calculate a springback value, said program for identification of a position of a measure against springback characterized by making a computer execute:   a procedure for acquiring forming data from said press forming analysis program,   a substitute forming data generating procedure for selecting at least part of the regions of a press formed part in forming data of a press formed part and calculating substitute forming data substituting predetermined data for at least one of a form of a selected region and a stress distribution of that selected region, and   a procedure for outputting said substitute forming data to said springback analysis program.