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Springback Calculation Process Tutorial - Using Measured Tube Data

The information in this tutorial requires at least version 4.2, build 1443 - released January 30, 2024.

Springback variables help users get to a good part faster by calculating the anticipated overbend necessary to overcome material springback. Using Springback can reduce the number of corrections loops needed to dial in a part shape.

VTube-LASER allows you to use the measured angles from a measured tube.

Calculate the Springback variables using the MEASURED bend angles like this:

  1. Set up the bender for the diameter and tooling you want to use for the next part.
  2. Create a part setup with two bends with different angles.  One bend should be around 20 degrees. The other bend should be around 120 degrees. Be sure that no recalculated compensation is being used at the bender.
  3. Bend the part.  
  4. In VTube-LASER, create a two-bend part with the same angles you programmed into the bender. Use whatever values are convenient. Two more different bend angles are better than two similar angles. They cannot be the same angle value.
  5. Measure the part.  Don't bother to align it. (You will not need an alignment.)
  6. Right-click in the Part Setup menu and click Recalculate the Springback variables from the MEASURED bend angles.
  7. You will see the new Springback variables or this material.
  8. Copy this data into the Springback table (right-click and enter the Springback Table). Use a Springback name that includes information to allow you to find and reuse it later. (Suggestions: Material type, OD, Radius)
  9. Import the new part in VTube-STEP.
  10. Copy the Springback variables into Part Setup from the Springback Table (if they are not already in Part Setup).
  11. In the Bender Output menu, be sure the use Springback checkbox is checked.
  12. Send the new tube data to the bender.