How do I choose a die set for my press brake?

List the bend types the shop runs, then match each to a punch profile and die that clear every flange at every stage. Single-V dies in the common openings plus an acute, a radius and an offset punch cover most job-shop work.

What die do I need for a Z bend?

An offset punch with a matching die, or a gooseneck where the flange is tall. The middle flange needs clearance as the punch comes down, which a plain straight punch cannot give.

Can one die bend all thicknesses?

Within limits. The eight times rule means each thickness has its own ideal opening, so a shop set covers the common openings and heavy or very thin work needs a specific die.

What is the most common die choice mistake?

Choosing the die for the bend and ignoring the flanges already formed. The second bend collides with the first flange and the operator reaches for more tonnage instead of the right punch profile.

Do I need a special die for hemming?

A hemming die or a flat die for the closing stage, plus an acute or gooseneck punch for the pre-bend. The pre-bend radius is what decides whether the hem cracks.

How to Choose a Die Set for Each Bend Type

Why does the bend type decide the die?

Each bend type has its own collision and clearance problem. The die has to support the sheet where the punch is not touching it, and leave room for the flanges that are already formed. A die that is perfect for an open U will wreck a Z bend, because the upstanding leg has nowhere to go.

Which die suits which bend type?

Start from the section you are forming, then pick the punch profile and die that clear every flange at every stage of the sequence.

Common bend types and the tooling they need
Bend type	Typical punch	Typical die	Watch for
Simple U / channel	Straight	Single-V, 8t opening	Minimum flange on the shoulders
Z bend / offset	Offset or gooseneck	Two-level or single-V	Flange collision mid-bend
Return flange	Gooseneck	V with clearance below	Relief depth vs flange height
Acute angle	Acute punch	Narrow V or acute die	Force and tip load
Radius bend	Large-radius tip	Large-radius bottom die	Springback at large R/t
Hem	Acute or hemming punch	Hemming or flat die	Cracking, allowance
Joggle / step	Offset punch	Matching stepped die	Height difference per step

What is the sequence problem?

On parts with several bends, an early flange can block a later tool. The fix is usually the bend order or a relieved punch, not more force. Sketch the part through every stage of the sequence before choosing the tooling.

List every bend and the flange heights after each one.
For each bend, check what the punch and die would touch that is not sheet.
Reorder the bends so the tallest flanges come last where possible.
Where reordering is impossible, choose the relieved profile that clears.

Does one die set cover a shop?

Partly. A set of single-V dies in the common openings, plus one acute, one radius and one offset punch, covers most job-shop work. The gaps show up as soon as a part has a return flange or a tight radius, which is when adjustable or purpose-made tooling earns its cost.

Whatever the set, every opening still follows the eight times rule, and the tonnage still has to fit the machine and the tooling rating.

Next step

Send the part drawing and we will map each bend to a punch and die before you order.

Request a quotation

Send an enquiry

Tell us the machine make and model, or describe the tooling you need. We reply to every enquiry within one business day, and quote from a drawing for special profiles.

Prefer email? Write to [email protected] — enquiries from this form go to the same address.

How to choose a die set for bend types

Why does the bend type decide the die?

Which die suits which bend type?

What is the sequence problem?

Does one die set cover a shop?

Related technical pages

Bend sequence

Gooseneck vs straight punch

Offset and Z tooling

Radius dies

Next step

Send an enquiry