Press Brake Die

The Ultimate Guide to Selecting Press Brake Dies for Flawless Bends

Introduction

Press Brake Dies: Basics & Core Parts

• Punch (upper die)

• Die (lower die)

• Machinery manufacturing

• Sheet metal fabrication

• Hardware production

• Cabinet and enclosure manufacturing

Core Components & How They Work

Upper Die (Punch)

Lower Die

Working Principle

1. Place the sheet metal on the lower die.

2. The ram moves the upper die down, pressing the metal into the shape of both dies.

3. Once the right pressure and movement are reached, bending is done.

4. The upper die moves back up, and you can take out the finished part.

Key Features of Press Brake Dies

Material and Hardening (42CrMo Advantage)

• We use 42CrMo (42CrMo4) alloy steel — it balances toughness and durability well.

• It can handle high pressure and friction without breaking or bending.

• Our dies go through Full Induction Hardening, reaching HRC 48-52 hardness.

• This hardening protects the V-groove from wear or damage under heavy pressure, reducing the need for frequent replacements.

Single-V vs. Multi-V Dies

Single-V Dies

• Best for CNC machines with automatic clamping.

• High precision and easy to change, saving setup time.

• Great for high-volume, precise production.

Multi-V Die Blocks

• Good for manual or hydraulic machines.

• One block has multiple V-grooves of different widths.

• No need to change tools often — perfect for small batches or mixed work.

Customization & Compatibility

• Punches can be custom-made (rounded, gooseneck, irregular) to fit your needs.

• Lower dies can have different V-groove widths (8mm, 16mm, 24mm) or special shapes.

• Dies must fit your machine’s clamping system, ram movement, and pressure capacity to avoid installation issues.

Standardization

• Standard dies fit major machine brands (Amada, Trumpf, Wila) and can be bought and used right away.

• Special dies can be custom-made for your specific needs.

Common Types of Press Brake Dies

By Forming Shape

• Standard Straight Die: For regular straight bends (most common).

• Sharp-Angle Die: For small angles or fixing springback (high precision).

• Gooseneck Die: For U-shaped or deep parts (avoids hitting already bent edges).

• Radius Die: For rounded bends (curved parts or smooth transitions).

• Irregular Custom Die: Made for unique, non-standard shapes (from your drawings).

By Application

• Standard Dies: For common metals (mild steel, galvanized steel) — good value.

• High-Strength Steel Dies: Reinforced and hard — for stainless steel or tough alloys.

• Thin Material Dies: Precision-made to prevent warping, bending, or scratching thin metal.

By Installation Interface

• Amada / Promecam Type: Fits Amada machines.

• Trumpf / Wila Type: Fits Trumpf and Wila machines.

• New Standard Type: Universal — fits most domestic machines.

How to Choose the Right Press Brake Dies

1. Match Your Material

• Mild steel: Low springback — use an 86°–88° punch for 90° bends.

• Stainless steel/high-strength steel: High springback — use an 85° punch or adjust the angle.

• 42CrMo dies work with most materials, reducing the need for multiple die sets.

2. The 8× Rule (V-Opening Size)

• For most mild steel: V-opening width = 8 × material thickness (V = 8T).

• This ensures smooth bends and prevents cracking.

• Adjustments:

• Thin metal (T ＜ 3mm): Use V = 6T for smaller curves.

• Thick metal (T ＞ 8mm): Use V = 10T–12T to reduce pressure and avoid die damage.

3. Sectionalized Dies for Complex Bends

• For custom-length or irregular parts — use sectionalized dies (10mm, 20mm, 100mm segments).

• Segments are precise (±0.01mm) and can be combined to make any length.

• Saves money: Replace only damaged segments, not the whole die.

4. Pressure & Tonnage Limits

• Calculate bending pressure based on material thickness, strength, and V-width.

• Do not exceed the die’s pressure limit — leave a 10%–15% safety margin.

• For thick/tough materials: Use reinforced or sectionalized dies to spread pressure.

5. Choose the Right Punch Shape

• Standard: For regular bends.

• Sharp-angle: For small angles or springback.

• Gooseneck: For deep U-shapes or boxes.

• Rounded/custom: For curved or unique parts.

6. Check Machine Compatibility

• Choose the right holder type (Amada, Trumpf/Wila, New Standard).

• Ensure die height fits the machine’s ram movement and worktable opening.

Important Selection Tips

• Account for material springback to avoid wrong angles and waste.

• Follow the 8× rule and adjust for material thickness to prevent damage.

• Check that the die fits your machine to avoid installation problems.

• Prioritize 42CrMo material and Full Induction Hardening for long die life.

Conclusion