Bending Dies for Hydraulic Press：Key Product Info
We supply all types of segmented press brake tools, including Multi-V Dies, Acute Angle Punches and Gooseneck Punches. All dies are made of 42CrMo (AISI 4140) steel. We use induction hardening to make them HRC 47±3 hard, so they wear well over time. Each part is precision-ground, ensuring high dimensional accuracy, stable bending and long life for industrial metal forming.
Why Hydraulic Press Brake Dies Are Important
A press brake’s bending accuracy depends entirely on its dies. Even good CNC systems cannot fix worn or poorly made dies. Bad dies cause uneven angles, bent parts and inconsistent results. At Alas Machinery, our dies stay strong even under heavy, constant use.
What Are Hydraulic Press Bending Dies?
Hydraulic press bending dies are tools for bending sheet metal. They work with hydraulic bending machines to make parts in shapes like 90° angles, U-shapes and V-shapes. They are used in machinery, sheet metal, hardware and cabinet making.
Core Parts & How They Work
1. Core Parts
Upper Die (Punch): Moves with the machine’s slider. Its shape determines 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 how much force is needed to bend and the part’s 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 Our Hydraulic Press Brake Dies
Strong & Durable: Made of tough steel with heat treatment. It can handle high pressure and friction during long-term use.
Customizable: We can make dies in special shapes and sizes to fit your parts.
Fits Your Machine: Designed to match your bending machine’s size and power.
Standard Sizes: Common sizes fit popular machines (Amada, Trumpf, Wille).
Types of Press Brake Bending 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. For example, 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 metal spring-back — it causes wrong angles.
Follow the 8x rule — otherwise, parts will crack and dies will break.
Make sure dies fit your machine — otherwise, they won’t install correctly.
Why Choose Our Hydraulic Press Tooling?
As a professional manufacturer and supplier, we know no two hydraulic press setups are the same. We offer full OEM custom services, designing dies based on your machine’s bed size, stroke length and the material thickness you need to form.
Every die set is precision-ground to ensure even load distribution. This protects your press cylinder and ensures a perfect bend every time.
Our high-performance bending dies are built to handle higher tonnages and impact forces than standard tools. They are ideal for heavy plate processing, forging and structural component manufacturing. Even under extreme pressure, they keep their shape and work reliably.
At AlasMachinery, we don’t just sell tools — we are your engineering partner. We provide full technical support, from material selection to tonnage calculations, to make sure your dies work perfectly with your hydraulic press. We also make custom dies from your drawings.
42CrMo International Standard Comparison Table (Essential for Selection)
Country/Standard Organization | Standard Code | Corresponding Grade |
China (GB) | GB/T 3077 | 42CrMo or 42CrMo4 |
USA (AISI/ASTM) | ASTM A29 | 4140 |
International Organization for Standardization (ISO) | ISO 683-1 | 42CrMo4 |
Germany (DIN) | DIN EN 10083 | 1.7225 (or 42CrMo4) |
Japan (JIS) | JIS G4105 | SCM440 |
UK (BS) | BS 970 | 708M40 (EN19) |
Why 42CrMo Is More Durable Than Ordinary Carbon Steel？
42CrMo alloy steel offers significantly higher durability compared with ordinary carbon steel, thanks to its alloy composition, heat treatment performance, and mechanical properties.
It contains chromium(Cr), molybdenum(Mo) and manganese, which greatly improve:
Higher hardness and wear resistance
Better strength and toughness
Higher tensile and yield strength
Excellent performance under high pressure and heavy load
Longer service life in industrial applications
Ordinary carbon steel is soft, wears out quickly, and deforms easily under pressure.42CrMo maintains shape, stability even under long-term heavy working conditions, making it the ideal material for press brake toolingand molds.
Bending Dies drawing
FAQ
Q1: What material is best for high-precision press brake dies?
42CrMo (DIN 1.7225) is the top material for professional dies. It is stronger and tougher than regular carbon steel.T8 and T10 steel work for light-duty bending. For CNC machines and stainless steel bending, 42CrMo prevents deformation and keeps long service precision. Q2: Are your dies compatible with Amada, Trumpf and LVD machines?
Yes. Our press brake tooling fits all mainstream machine standards.
Euro Style (Amada/Promecam): Widely used universal clamping type.
New Standard (Wila/Trumpf): High-precision button and hydraulic clamping.
American Style: Standard tang clamping for old US machines.
Please send your clamping size for perfect fitting.
Q3: How to choose the right V-opening for sheet metal?
Follow the 8x rule: V-opening width = 8 × sheet thickness.
For example, 2mm steel uses 16mm V-die.
For metal thicker than 6mm, use 10x or 12x V-opening to lower bending force and avoid die cracking.
Q4: Can I get segmented tools for small box bending?
Yes. We supply segmented tooling.
Standard 835mm tools are cut into small sections: 10, 15, 20, 40, 50, 100, 200, 400mm.
You can combine different sections to match exact bending length, ideal for four-sided box bending.
Q5: How to avoid scratches on polished stainless steel?
We suggest these solutions:
Use V-dies with larger shoulder radius.
Choose dies with nylon or plastic inserts.
Add protective cloth or plastic film on dies during bending.