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Press brake tooling and sequencing · Lesson 3 of 4

Press brake tooling and sequencing: methods and worked application

The press-brake set-up method step by step, a worked estimate of die, radius, flange and tonnage for 24 ga galvanized with its assumptions, bend order, collision checks and what to inspect.

You will be able to: Apply a documented set-up method to a 24 ga galvanized bend, recording every input, assumption and unit, plan a bend sequence that avoids collisions, and name the inspection points.

9 min · 10 slides · 6 questions

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Slide 1 of 10

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)
Setting up a bend: press brake and AFS folderTwo lanes. Press brake, steps 1 to 8: die near 8 t, flange at least 0.7 V, radius as a share of V, tonnage against limits, a bend order that stays gaugeable and collision-free, test bend and measure, run and inspect, remake a bad part. AFS folder, steps 9 to 13: FlashDraft profile, AFS limits check, OK, review or blocked, sent to the folder, inspect the piece.Press brake(industry)AFS folder(on record)12345678910111213Die near 8 tFlange at least 0.7 VRadius: % of VTonnage vs limitsPlan a safe orderTest bend, measureRun and inspectBad part: remakeFlashDraft profileAFS limits checkOK, review, blockedSent to the folderInspect the piecePress-brake rulesof thumb do not setAFS's limits.

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
Left, press brake industry practice; right, the AFS steps on record. The folder's own internal steps are not shown.

Videos for this lesson

What this video shows: A step-by-step set-up of an Accurpress press brake for a 90 deg bend in 16 ga. Its own description corrects one spoken figure: 3/16, not 3/8.

Video: Accurpress Video #3 - How to set the press to preform a 90deg bend. by Camosun Sheet Metal, on YouTube. Chosen from the video's published description.

What this video shows: CIDAN shows a TD series double folder forming a range of trim parts in automatic and semi-automatic modes. It is a different machine from AFS's folder.

Video: Thalmann TD150 6.4 Double Folder - Forming Different Parts by CIDAN Machinery Group, on YouTube. Chosen from the video's published description.

Glossary

Tonnage per inch
The force, in tons, needed for each inch of bend length; multiplied by the length for the whole bend.
Bend sequence
The order in which bends are formed so the part can be gauged and does not collide with the machine.
Open height
The space between the ram and the bed when the machine is open; tall tools and parts use it up.
Stroke
How far the ram travels; WILA says at least half the open height.
Up-down folder
A folding machine that bends up and down, so the sheet need not be turned over for a reverse bend.