Sheet metal brake dies are special forming molds used with bending machines.They are the key parts for bending and shaping metal sheets.They have two main parts: the upper die and the lower die.
When the bending machine’s slider moves, it presses the sheet between the upper and lower dies.The sheet deforms into your desired shape — such as 90° bends, U-shapes, or V-shapes.
These dies are widely used in:
Machinery manufacturing
Sheet metal fabrication
Hardware production
Cabinet making
They are also known as press brake punch and die, bending machine tooling, and metal forming dies.
Core Components & How They Work
Upper Die
Mounted on the moving slider of the bending machine
Applies pressure to the sheet
Its shape decides the outer shape of the finished part
Common shapes: straight edge, sharp angle, gooseneck, arc
Lower Die
Fixed on the machine workbench
Usually has a V‑shaped groove (V‑groove)
V‑groove width affects bending force, corner radius, and forming quality
Sectionalized Tooling
Provides various length combinations (e.g., 10mm, 20mm, 100mm)
Meets the bending needs of workpieces with different widths
Working Principle
Place the metal sheet on the lower die
The slider pushes the upper die down
The sheet bends and takes the shape of the dies
Once the set pressure is reached, the upper die lifts up
Remove the finished workpiece
Main Features of Sheet Metal Brake Die
High rigidity & wear resistance
Made of alloy steel (such as 42CrMo) with heat treatment.Hardness reaches HRC45–HRC50.They resist high pressure and friction during bending.
Customizable
We can make punches in arc, gooseneck, or special shapes.Lower dies can have different V‑groove widths (8mm, 16mm, 24mm) or special grooves.Sectionalized Tooling can also be customized according to workpiece width requirements.
Good compatibility
Die size, height, and mounting type must match your bending machine.This ensures accurate bending and high yield.
Standardized & serialized
Standard dies fit most common brands like Amada, Trumpf, and Wille.Special dies (including Sectionalized Tooling) can be custom-made for your production needs.
Common Types of Sheet Metal Brake Die
By shape
Standard straight edge die: For general bending, most widely used
Sharp angle die: For small angles and springback compensation
Gooseneck die: For deep U‑shaped parts, avoids interference
Arc die: For rounded corners and curved shapes
Irregular die: Custom for special workpiece shapes
Sectionalized Tooling: For workpieces of different widths, with adjustable length combinations
By application
Standard bending dies: For mild steel, galvanized steel
High‑strength steel dies: For stainless steel and hard alloys
Thin sheet dies: Precision design to avoid warping or scratches
By machine interface
How to Choose the Right Sheet Metal Brake Die
Choosing the right bending machine tooling is very important.It affects bending accuracy, efficiency, and die life.
1. Match material properties
Mild steel has little springback
Stainless steel springs back more — use an 85° punch to compensate
Choose dies based on sheet thickness to avoid cracking or damage
2. Follow the “8x rule” for V‑groove width
Basic rule:V‑groove width = 8 × sheet thickness
3. Respect pressure tonnage limits
Never overload the die
Keep a 10–15% safety margin
For thick or strong steel, use thickened dies or hardened steel segments
For workpieces of different widths, choose Sectionalized Tooling to ensure flexible and accurate bending
4. Choose the right punch shape
Standard punch: general straight bending
Sharp‑angle punch: small angles and springback control
Gooseneck punch: deep U‑shapes
Custom punch: round or irregular parts
Sectionalized Tooling: For flexible adaptation to different workpiece widths
5. Check machine compatibility
Make sure the die shank fits your machine’s clamping system
Die height must match the slider stroke
Wrong size leads to installation failure or incomplete bending
Important Tips When Choosing Dies
Don’t ignore springback — it causes wrong angles
Follow the 8x rule to prevent cracking and die damage
Always check compatibility with your bending machine
Choose Sectionalized Tooling when you need to bend workpieces of different widths
The Power of Material: Why We Use 42CrMo (4140)
High-quality metal forming dies must withstand hundreds of tons of pressure per meter.
We use:
42CrMo / 42CrMo4 alloy steel
Balances high hardness and great toughness
Full hardening
Strong inside and outside, prevents breaking
Laser or induction hardening
Working surface reaches HRC45–50
Maintains precision even after thousands of bends
Our press brake punch and die, hardened steel segments, and Sectionalized Tooling provide stable, long‑lasting performance for all your bending jobs.
We manufacture premium Sheet Metal Brake Dies and Press Brake Tooling (42CrMo, HRC 47-52) compatible with Amada, Trumpf, Wila, and Promecam systems:
English: Sheet Metal Brake Dies | Press Brake Punches and Dies
French (Français): Matrices de presse plieuse | Outils pour pliage de tôle
Italian (Italiano): Matrici per presse piegatrici | Utensili per piegatura lamiera
Portuguese (Português): Matrizes para quinadoras | Ferramentas de dobra de chapa
Polish (Polski): Matryce do pras krawędziowych | Narzędzia do gięcia blachy
Turkish (Türkçe): Abkant Pres Kalıpları | Sac Bükme Kalıpları
Vietnamese (Tiếng Việt): Khuôn máy chấn tôn | Khuôn dập uốn tấm kim loại
Thai (ภาษาไทย): แม่พิมพ์เครื่องพับเหล็กแผ่น | เครื่องมือพับโลหะแผ่น
Arabic (العربية): قوالب ماكينة ثني الألواح | أدوات ثني الصاج
Hindi (हिन्दी): शीट मेटल ब्रेक डाई | प्रेस ब्रेक बेंडिंग टूल्स
Indonesian (Bahasa Indonesia): Cetakan Tekuk Plat Besi | Alat Tekuk Press Brake
Malay (Bahasa Melayu): Acuan Mesin Lipat Besi | Alat Bengkok Kepingan Logam
Dutch (Nederlands): Kantpersmatrijzen | Gereedschap voor plaatbuigen
Swedish (Svenska): Kantpressmatriser | Verktyg för plåtbockning
Hungarian (Magyar): Élhajlító matricák | Lemezhajlító szerszámok
Greek (Ελληνικά): Μήτρες στραντζόπρεσας | Εργαλεία κάμψης λαμαρίνας