Hydraulic Press Brake Dies

Press Brake Dies: Key Info

Why Press Brake Dies Matter

• A press brake’s accuracy depends on its dies (tools).

• Even good CNC systems can’t fix worn or poorly made dies.

• Bad dies cause inconsistent angles or deformed parts.

• Alas Machinery makes dies that stay strong under heavy use.

What Are Press Brake Dies?

Core Parts & How They Work

1. Core Parts

• Upper Die (Punch): Moves with the machine’s slider. Its shape decides the part’s outer look (straight, sharp, curved, etc.).

• Lower Die: Fixed on the machine’s table. It usually has a V-shaped groove. The groove width affects bending force and part quality.

2. How They Work

• Place the sheet metal on the lower die.

• The slider moves the upper die down to press the metal.

• The metal bends into the shape of the dies.

• The upper die moves back up, and you take the part out.

Key Features of Press Brake Dies

• Strong & Durable: Made of tough steel (like 42CrMo) and heat-treated. Hard enough to handle heavy pressure and friction.

• Customizable: Can be made in special shapes/sizes to match your parts.

• Fits Your Machine: Must match your bending machine’s size and power.

• Standard Sizes: Common sizes fit popular machines (Amada, Trumpf, Wille).

Types of Press Brake Dies

1. By Shape

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

• Sharp Angle: For small angles or precise bends.

• Gooseneck: For U-shaped or deep parts (avoids interference).

• Arc: For curved or rounded parts.

• Custom Irregular: Made for special part shapes.

2. By Use

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

• High-Strength: For tough metals (stainless steel) — thicker and harder.

• Thin Material: Prevents damage to thin sheets.

3. By Machine Fit

• Amada/Promecam: Fits Amada machines.

• Trumpf/Wila: Fits Trumpf and Wila machines.

• New Standard: Fits most domestic machines.

How to Choose the Right Dies

• Match the Material: Different metals bend differently (e.g., stainless steel needs a special punch to avoid wrong angles).

• Follow the 8x Rule: Lower die V-groove width = 8 × material thickness (adjust for thin/thick sheets).

• Check Machine Power: Dies must handle your machine’s pressure (don’t overload).

• Choose the Right Punch Shape: Match the punch to your part’s final shape.

• Ensure a Good Fit: Dies must fit your machine’s clamping system and size.

Quick V-Die Width Guide

• Medium sheets (3–8mm): V = 8 × material thickness

• Thin sheets (＜3mm): V = 6 × material thickness

• Thick sheets (＞8mm): V = 10–12 × material thickness

Important Tips

• Don’t ignore how metal springs back — it causes wrong angles.

• Follow the 8x rule — or parts will crack and dies will break.

• Make sure dies fit your machine — or they won’t install right.