SH.10.24.1
A custom 24° U-groove press brake hemming die designed for two-stage bending and flattening of thin sheet metal. The first operation forms the sheet to approximately 24°, while the second flattening operation is completed using the same U-shaped die groove. Unlike spring-loaded or pneumatic hemming tools, this design uses a fixed tooling structure without an integrated spring or air-powered flattening mechanism. The tooling shown is designed for 1.2 mm sheet metal and has a maximum load capacity of 100 ton/m. This type of U-groove hemming die is generally suitable for thin sheet applications below approximately 1.5 mm, depending on material properties and part geometry.
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Description
24° U-Groove Two-Stage Hemming Die for Thin Sheet Metal
This special press brake tooling is designed for applications where a thin sheet metal edge must first be bent to an acute angle and then flattened in a second operation.
Unlike conventional spring-loaded hemming tools or pneumatic hemming systems, this tooling uses a simple fixed U-groove lower die structure.
Both forming stages are completed using the same punch and the same die groove.
During the first operation, the sheet is bent to approximately 24°.
During the second operation, the pre-bent workpiece is repositioned into the same U-shaped groove and compressed further to create the required flattened or hemmed edge.
This compact tooling concept is particularly suitable for light-gauge sheet metal where a conventional spring hemming die or pneumatic flattening system may not be necessary.
Two-Stage Hemming Process
First Operation – 24° Acute Pre-Bending
The first forming operation creates an acute bend of approximately 24°.
The punch features an R0.5 tip radius, while the lower die uses a 10 mm wide U-shaped groove.
This first bend creates the required intermediate shape before flattening.
Second Operation – Same-Groove Flattening
After the acute pre-bending operation, the workpiece is repositioned for the second forming stage.
The bent edge is placed back into the same 10 mm U-groove.
The press brake then continues the forming process until the required flattened or hemmed profile is achieved.
No separate flattening station is required within the tooling set.
Key Features
24° Acute Pre-Bending
The tooling is designed to create an approximately 24° acute bend before the final flattening operation.
Pre-Bending and Flattening in the Same Groove
Both stages use the same U-shaped lower die opening, providing a compact two-stage hemming solution.
Fixed U-Groove Structure
The lower die does not rely on a movable spring-loaded flattening plate.
No Pneumatic System Required
No compressed-air cylinder or pneumatic control system is required for the flattening process.
Suitable for Thin Sheet Metal
This structure is mainly designed for light-gauge sheet metal applications.
The tooling shown is designed for 1.2 mm sheet thickness.
High Tooling Load Capacity
Maximum rated tooling load:
100 ton/m
Custom Tooling Design Available
Punch angle, groove width, tooling height, tip radius, mounting interface and other dimensions can be customized according to the customer's application.
Technical Specifications
| Parameter | Specification |
|---|---|
| Tool Type | U-Groove Two-Stage Hemming Die |
| Tooling Function | Acute Pre-Bending + Flattening |
| Pre-Bending Angle | 24° |
| Punch Tip Radius | R0.5 |
| Punch Total Height | 158 mm |
| Punch Effective Height | 128 mm |
| Punch Width | 27 mm |
| Lower Die Height | 80 mm |
| Lower Die Width | 60 mm |
| U-Groove Width | 10 mm |
| Designed Sheet Thickness | 1.2 mm |
| Typical Application Range | Thin sheet below approx. 1.5 mm |
| Maximum Load | 100 ton/m |
| Hemming Method | Two-stage hemming in the same groove |
| Spring Mechanism | Not required |
| Pneumatic Mechanism | Not required |
| Custom Sizes | Available |
| Custom Mounting Systems | Available |
Working Principle
This U-groove hemming die performs the hemming process in two separate press brake strokes.
In the first stroke, the punch forms the sheet into an acute 24° pre-bend.
In the second stroke, the pre-bent section is returned to the same die opening and compressed further to produce the final flattened edge.
The tooling therefore performs both acute bending and flattening within the same U-shaped groove, while avoiding the additional moving mechanisms commonly used in spring-loaded or pneumatic hemming tools.
Advantages of the U-Groove Hemming Structure
Simple Mechanical Construction
The fixed tooling structure contains fewer moving components than many integrated spring or pneumatic hemming systems.
Same Tooling for Two Operations
The same punch and die set is used for both acute bending and final flattening.
Compact Tooling Design
No separate flattening section is required within the lower die.
Suitable for Light-Gauge Components
The tooling is especially useful for thin sheet metal products where precise edge folding and flattening are required.
Easy Customization
The tooling geometry can be adjusted according to different sheet thicknesses, materials, hem dimensions and press brake systems.
Typical Applications
This special hemming tool can be used for thin sheet metal components requiring folded or flattened edges, including:
- Electrical enclosures
- Control cabinets
- Sheet metal housings
- Equipment covers
- Stainless steel panels
- Electrical cabinet doors
- Appliance panels
- Light-gauge steel components
- Sheet metal boxes
- Custom fabricated enclosures
- Decorative sheet metal parts
- Industrial equipment panels
Suitable Materials
Depending on the material grade, tensile strength and required hem geometry, this tooling can be designed for processing:
- Mild steel
- Stainless steel
- Galvanized steel
- Aluminum sheet
- Pre-painted sheet metal
- Other light-gauge metal materials
Actual tooling clearance and groove dimensions should be determined according to the sheet thickness, material strength and required final profile.
Custom Press Brake Hemming Tooling
The Tool Shown Is Only One Example
The tooling shown on this page represents one custom solution designed for a specific 1.2 mm sheet metal hemming application.
It does not represent the full range of tooling that we can manufacture.
Different customers may require different:
- Acute bending angles
- Punch heights
- Punch widths
- Tip radii
- U-groove widths
- Groove depths
- Hem clearances
- Tooling lengths
- Tool segmentation
- Load capacities
- Mounting interfaces
- Tooling materials
- Surface treatments
We can develop the tooling according to the customer's sheet metal part drawing and actual press brake configuration.
Compatible Press Brake Tooling Systems
This U-groove hemming tool can be manufactured with different mounting interfaces according to the customer's press brake or tooling system.
Available configurations include:
AMADA Type
TRUMPF Type
WILA Type
LVD Type
Bystronic Type
and other press brake tooling systems.
Custom mounting profiles can also be produced according to customer drawings, tooling samples or machine specifications.
Custom Tooling Design Service
For special bending applications, standard catalogue tooling may not always provide the required forming result.
Customers can send us:
- Finished part drawings
- Sheet thickness
- Material grade
- Bending dimensions
- Required hem dimensions
- Bend length
- Press brake model
- Tool mounting interface
- Available machine tonnage
Our engineering team can evaluate the bending process and recommend a suitable custom press brake tooling solution.
Important design factors include:
- Acute pre-bending angle
- Sheet thickness
- Material tensile strength
- Springback
- Hemming clearance
- Groove width
- Punch tip radius
- Final hem geometry
- Tooling strength
- Press brake tonnage
- Workpiece interference
Related Press Brake Hemming Solutions
Depending on the application, different hemming structures may be used, including:
- U-Groove Hemming Dies
- Two-Stage Hemming Dies
- Spring-Loaded Hemming Tools
- Pneumatic Hemming Tools
- Flattening Dies
- Acute Angle Punches
- Custom Hemming Punches
- Special Thin-Sheet Hemming Tooling
The appropriate tooling structure should be selected according to sheet thickness, material, bending length, final geometry and production requirements.
