US 12,226,816 B2
Systems and methods for spingback compensation in bend forming processes
Lu Huang, Troy, MI (US); Hui-ping Wang, Troy, MI (US); Bradley J Blaski, Sterling Heights, MI (US); Joshua Lee Solomon, Berkley, MI (US); and Blair E Carlson, Ann Arbor, MI (US)
Assigned to GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Jan. 10, 2022, as Appl. No. 17/647,516.
Prior Publication US 2023/0219126 A1, Jul. 13, 2023
Int. Cl. B21D 5/00 (2006.01); B21D 5/02 (2006.01)
CPC B21D 5/004 (2013.01) [B21D 5/006 (2013.01); B21D 5/02 (2013.01); G05B 2219/37406 (2013.01); G05B 2219/45143 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method of bending a material to a target resultant bending parameter using a bend forming tool, the method comprising:
receiving, via at least one processor, values for parameters of properties of the material and of a bending process to be performed by the bend forming tool;
retrieving, via the at least one processor, a calibration curve relating input bending parameter and resultant bending parameter based on the values from a database of calibration curves, wherein the calibration curve is configured to compensate for differences between an input bending parameters and resultant bending parameters as a result of springback of the material, after bending of the material, due to a material properties of the material;
determining, via the at least one processor, a first springback compensated input bending parameter based on the target resultant bending parameter using the calibration curve by calculating a difference between the target resultant bending parameter and a calibration curve springback compensated input bending parameter that corresponds to the target resultant bending parameter according to the calibration curve and adding a fraction of the difference to the calibration curve springback compensated input bending parameter to obtain the first springback compensated input bending parameter;
inputting the first springback compensated input bending parameter to the bend forming tool;
in a first step of bending the material, bending the material to the first springback compensated input bending parameter by applying the bending process using the bend forming tool and measuring a first measured resultant bending parameter of a bend created by the first step of bending the material after allowing springback of the material;
determining, via the at least one processor, a deviation between the first measured resultant bending parameter and an expected resultant bending parameter that corresponds to the first springback compensated input bending parameter according to the calibration curve;
offsetting the calibration curve based on the deviation to provide an offset calibration curve;
determining, via the at least one processor, a second springback compensated input bending parameter based on the target resultant bending parameter using the offset calibration curve;
inputting the second springback compensated input bending parameter to the bend forming tool; and
in a second step of bending the material, bending the material to the second springback compensated input bending parameter by applying the bending process using the bend forming tool.