Systems and methods for spingback compensation in bend forming processes

Patent metadata

Field	Value
Publication number	US-12226816-B2
Application number	US-202217647516-A
Country	US
Kind code	B2
Filing date	Jan 10, 2022
Priority date	Jan 10, 2022
Publication date	Feb 18, 2025
Grant date	Feb 18, 2025

Abstract

Systems and methods for bending a material to a target resultant bending parameter using a bend forming tool are disclosed. The systems and methods receive values for parameters of properties of the material and of a bending process to be performed by the bend forming tool, creating or retrieving a calibration curve relating input bending parameter and resultant bending parameter based on the values from a database of calibration curves, determining a first springback compensated input bending parameter based on the target resultant bending parameter using the calibration curve, inputting the first springback compensated input bending parameter to the bend forming tool, and 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.

First claim

What is claimed is:

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.

2. The method of claim 1 , wherein the measuring is performed by an automated bending parameter measurement device of the bend forming tool or by a manual bending parameter measurement device.

3. The method of claim 1 , comprising:
recording, via the at least one processor, the first springback compensated input bending parameter and the first measured resultant bending parameter for each of a plurality of executions of the method of bending the material to provide M new calibration data points; and
generating a new calibration curve based on the M new calibration data points using a best fit function, wherein the new calibration curve is to be used as the calibration curve in subsequent executions of the method of bending the material, and wherein M is determined based on the best fit function.

4. The method of claim 1 , wherein:
the method comprises determining, via the at least one processor, whether the database of calibration curves includes the calibration curve that corresponds to the values and, if not:
the method further comprises:

bending the material to M different the input bending parameters by applying the bending process using the bend forming tool and measuring the resultant bending parameters, wherein Mis determined based on a function used for best curve fitting;
plotting the calibration curve based on the input bending parameters and the resultant bending parameters; and
recording the calibration curve in the database of calibration curves in association with the values.

5. The method of claim 1 , comprising receiving, via the at least one processor, the target resultant bending parameter from a user input device.

6. The method of claim 1 , wherein the target bending parameter is plunging distance, force of punch or bend angle.

7. The method of claim 1 , wherein the bend forming tool is a press brake.

8. The method of claim 1 , comprising:
receiving, via the at least one processor, the first measured resultant bending parameter of a bend created by the first step of bending the material;
determining whether the first measured resultant bending parameter falls within predetermined tolerance limits;
if the first measured resultant bending parameter falls within predetermined tolerance limits, then the bending process is complete;
if the first measured resultant bending parameter falls outside the predetermined tolerance limits, the method further includes:
discarding the material if the first measured resultant bending parameter exhibits an overbend; and
if the first measured resultant bending parameter exhibits an underbend, then the method further includes:
determining, via the at least one processor, the deviation between the first measured resultant bending parameter and the 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 the 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.

9. A system for bending a material to a target resultant bending parameter, the system comprising:
a bend forming tool;
at least one processor in operable communication with the bend forming tool, wherein the at least one processor is configured to execute program instructions, wherein the program instructions are configured to cause the at least one processor to:
receive values for parameters of properties of the material and of a bending process to be performed by the bend forming tool;
retrieve 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 input bending parameters and resultant bending parameters as a result of springback of the material, after bending of the material, due to material properties of the material;
determine a first springback compensated input bending parameter based on the target resultant bending parameter using the calibration curve and 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;
in a first step of bending the material, bend the material to the first springback compensated input bending parameter by applying the bending process using the bend forming tool;
receive a first mea

Assignees

• Gm Global Tech Operations Llc

Inventors

• Huang Lu
• Wang hui-ping
• Blaski Bradley J
• Solomon Joshua Lee
• Carlson Blair E

Classifications

• G05B2219/45143

  Press-brake, bending machine · CPC title

• G05B2219/37406

  Detect position of detector contact point relative to reference on tool slide · CPC title

• B21D5/006

  combined with measuring of bends · CPC title

• B21D5/02 Primary

  on press brakes without making use of clamping means · CPC title

• G05B19/4097

  characterised by using design data to control NC machines, e.g. CAD/CAM (G05B19/4093 takes precedence) · CPC title