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Press brake tooling and sequencing · Lesson 4 of 4

Press brake tooling and sequencing: defects, verification and case study

Reading bad bends: open angles, short flanges, creases, collisions, scratches and cracks; why hemming overloads a brake; why bad parts are remade; a case worked through and the evidence record.

You will be able to: Diagnose a press-brake bending defect from its symptom, choose the published correction, and document the evidence and the checks for review.

9 min · 11 slides · 6 questions

All lessons in this module
Slide 1 of 11

Read the defect

Where and how a bend goes wrong points to its cause. Each correction here is the published press-brake remedy, not an AFS setting.

The pairs show four of them, correct beside incorrect.

Correct and incorrect press-brake bendsFour pairs, correct on the left and incorrect on the right. Flange: spanning both die shoulders, against a flange too short to reach the far shoulder. Radius: a rounded bend, against a crease. Long bend: an even gap, against a ram and bed bowed apart in the middle. Remake: a clean part, against a flattened and rebent part with a mark at the old bend.CorrectIncorrectFlange spans the shouldersRadius, not a creaseEven angle along a long bendRemake from a new blankCORRECTINCORRECTCORRECTINCORRECTCORRECTINCORRECTCORRECTINCORRECTtoo shortcreaseopenold bend

Four pairs, each marked correct with a green check or incorrect with a red cross. Flange: a flange spanning both die shoulders, against a flange too short to reach the far die shoulder. Radius: a rounded bend, against a crease. Long bend: an even gap from a crowned machine, against a ram and bed bowed apart in the middle. Remake: a clean part from a new blank, against a flattened and rebent part with a mark at the old bend.

Press brake defects, industry practice. Deflection exaggerated for clarity; not to scale.

Sources

Videos for this lesson

What this video shows: Wilson Tool explains galling, metal building up on press brake tooling, and how to identify it, remove it and prevent it.

Video: Galling on Press Brake Dies | Bending | Technically Speaking by Wilson Tool International, on YouTube. Chosen from the video's published description.

Glossary

Deflection
The ram and bed bending under load, which leaves the angle more open in the center of a long bend.
Overbend
Bending past the angle wanted so the part springs back to it.
Side thrust
A sideways load on the tooling in hemming that can shift and twist the tooling; thrust plates limit it.
Mold line
The theoretical sharp corner of a bend; AFS measures every leg to it.