A documented method
On a press brake, set-up runs in this order:
- Pick the die: start near 8 t
- Check every flange against about 0.7 V
- Estimate the radius as a share of V
- Check tonnage against machine and tooling limits
- Plan the sequence; check each stage for collisions
- Test bend; measure the angle at both ends and the center
- Run and inspect; remake a bad part from a new blank (Steve Benson, The Fabricator)
Two lanes. Press brake lane, steps 1 to 8: pick the die near 8 t, check the flange, estimate the radius, check tonnage, plan the sequence, test bend and measure, run and inspect, remake any bad part. AFS folder lane, steps 9 to 13: FlashDraft profile, limits check, OK, review or blocked, sent to the folder, inspect the piece.
- 1
- Pick the die: start near 8 t (typical, The Fabricator)
- 2
- Check every flange is at least about 0.7 V
- 3
- Estimate the inside radius as a share of V for the metal
- 4
- Tonnage per inch x length x factors, against machine and tooling limits
- 5
- Plan an order that keeps the part gaugeable and collision-free (Benson starts inside out on his example)
- 6
- Test bend; measure the angle at both ends and the center; adjust the overbend
- 7
- Run and inspect
- 8
- A bad part: remake it from a new blank (Steve Benson, The Fabricator)
- 9
- The profile drawn in FlashDraft: legs to the mold line, angles, hems as features
- 10
- AFS limits: girth up to 48 in, standard piece 10 ft and maximum 126 in, end flange 0.5 in, leg 0.75 in, hem return 0.375 in
- 11
- The result: OK, shop review, or blocked
- 12
- Sent through PathfinderEdge to AFS's folder
- 13
- The formed piece inspected against the drawing
Sources
- Getting back to air forming and bending basics on the press brake (Steve Benson, 2022-10-27) - The Fabricator (FMA)
- Six steps for selecting the right die for press brakes (Steve Benson, 2015, updated 2023) - The Fabricator (FMA)
- Press brake bending tips for forming tapered bends and determining minimum flange lengths (Steve Benson) - The Fabricator (FMA)
- Taking a deep dive into press brake tonnage, Part I: Improving formulas (Steve Benson, 2019-11-12) - The Fabricator (FMA)
- Better bend sequencing and gauging on the press brake (Steve Benson) - The Fabricator (FMA)
- Better bend accuracy on the press brake through crowning (Steven Lucas, 2018-07-09) - The Fabricator (FMA)
