Phone:
86-15852949220
NANJING ALAS INTERNATIONAL CO., LTD
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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.
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.
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).
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.
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.
Amada/Promecam: Fits Amada machines.
Trumpf/Wila: Fits Trumpf and Wila machines.
New Standard: Fits most domestic machines.
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.
Medium sheets (3–8mm): V = 8 × material thickness
Thin sheets (＜3mm): V = 6 × material thickness
Thick sheets (＞8mm): V = 10–12 × material thickness
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.
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) |
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.
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.
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.
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.
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.
Nanjing Alas International Co., Ltd. is a professional industrial tooling manufacturer focused on shear blades, bending dies, shredder blades, and custom wear parts. We offer full application engineering, material selection, setup guidance, and after-sales support to global customers.
Tell us your requirements, and our engineering team will provide professional solutions for blade specification, tool life optimization, and cost-effective production.