28° V16 Spring-Loaded Hemming Die for 2 mm Sheet Metal
A custom spring-loaded press brake hemming die designed for acute pre-bending and final flattening of approximately 2.0 mm sheet metal. The tooling shown features a 28° V16 opening, an overall tooling height of approximately 144 mm, a 60 mm wide base, and a maximum rated load capacity of 100 ton/m. The spring-supported moving structure allows the tooling to perform the flattening stage after acute pre-bending and automatically returns the movable section when the press brake ram retracts. This provides a compact mechanical hemming solution without requiring a pneumatic system. The V-opening, angle, tooling height, base width, spring configuration and lower-die mounting interface can all be customized according to the workpiece and press brake system.
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Description
28° V16 Spring-Loaded Hemming Die for 2 mm Sheet Metal
This spring-loaded hemming die is designed for sheet metal components that require an acute pre-bend followed by a final flattening or hemming operation.
The illustrated tooling combines a 28° V16 acute bending opening with a spring-supported movable die structure.
During the first operation, the sheet metal edge is formed to an acute angle using the V16 opening.
For the second operation, the pre-bent workpiece is repositioned into the flattening area of the tooling. As the press brake ram moves downward, the movable section is compressed while the machine supplies the forming force required to flatten the folded edge.
After the press brake ram retracts, the internal springs return the moving tooling section to its original position.
This two-stage mechanical design integrates acute bending, flattening and automatic spring return in one compact tooling assembly.
Two-Stage Hemming Process
First Operation – 28° Acute Pre-Bending
In the first press brake stroke, the workpiece is bent using the 28° V16 opening.
This operation produces the acute preliminary bend required before final flattening.
Second Operation – Spring-Assisted Flattening
The pre-bent flange is then repositioned into the flattening section.
During the second stroke, the press brake applies the required force while the movable tooling section compresses against the internal spring system.
The folded edge is progressively flattened until the required hem geometry is achieved.
Automatic Spring Return
When the press brake ram retracts, the spring system pushes the movable section back to its initial position.
The tooling is then ready for the next production cycle.
Key Features
28° Acute Bending Geometry
The first forming stage uses a 28° acute bending opening.
V16 Opening
The illustrated version features a 16 mm V-opening, matched to the specified 2.0 mm sheet metal application.
Designed for 2 mm Sheet Metal
This tooling configuration is typically used for approximately 2.0 mm sheet thickness, subject to material strength, ductility, bend length and required hem geometry.
Spring-Loaded Moving Structure
Internal springs support the movable tooling section and enable automatic reset after the flattening cycle.
Integrated Acute Bending and Flattening
The tooling combines the initial acute bend and final flattening functions within one assembly.
No Pneumatic System Required
The mechanical spring structure does not require compressed air, pneumatic cylinders or air control components.
60 mm Wide Base
The illustrated lower die uses a 60 mm base width, making it particularly suitable for press brakes with relatively large lower worktables or die support surfaces.
Maximum Rated Load: 100 ton/m
The tooling is rated for a maximum load of 100 ton/m, subject to actual working length, material properties and application conditions.
Technical Specifications
| Parameter | Specification |
|---|---|
| Tool Type | Spring-Loaded Hemming Die |
| Tooling Function | Acute Pre-Bending + Flattening |
| Pre-Bending Angle | 28° |
| V Opening | V16 |
| Overall Tooling Height | 144 mm |
| Base Width | 60 mm |
| Designed Sheet Thickness | Approx. 2.0 mm |
| Maximum Rated Load | 100 ton/m |
| Flattening Structure | Spring-Loaded Moving Section |
| Tool Return | Automatic Spring Return |
| Pneumatic System | Not Required |
| Custom Angles | Available |
| Custom V Openings | Available |
| Custom Heights | Available |
| Custom Base Widths | Available |
| Custom Mounting Interfaces | Available |
Working Principle
The spring-loaded hemming die performs the hemming process in two separate press brake operations.
First, the sheet metal is bent to an acute angle using the 28° V16 opening.
The pre-bent workpiece is then repositioned for the flattening operation.
During the second press brake stroke, the machine applies the required forming force while the movable die section travels against the internal spring system.
The folded edge is flattened to the required final condition.
After the ram retracts, the springs restore the movable section to its original position.
This structure provides a practical mechanical solution for two-stage hemming without relying on pneumatic actuation.
Advantages of the Spring-Loaded Hemming Structure
Integrated Two-Stage Forming
Acute bending and flattening are combined in one tooling assembly.
Automatic Mechanical Reset
The internal spring system automatically returns the movable section after each forming cycle.
No External Air Supply Required
No pneumatic cylinder, air hose or compressed-air control system is required.
Suitable for Repetitive Hemming Operations
Automatic spring return improves convenience in repeated production.
Compact Tooling Arrangement
The acute bending and flattening functions are integrated into one tool rather than requiring completely separate forming systems.
Flexible Customization
The V-opening, acute angle, tooling height, base width, spring structure and mounting interface can all be adapted to the application.
Typical Applications
This spring-loaded press brake hemming die can be used for sheet metal parts requiring folded, closed or flattened edges, including:
- Electrical enclosures
- Control cabinets
- Cabinet doors
- Sheet metal housings
- Equipment covers
- Stainless steel panels
- Machine covers
- Appliance panels
- Sheet metal boxes
- Industrial equipment panels
- Fabricated steel components
- Custom enclosure fabrication
Suitable Materials
Depending on material properties, sheet thickness and final hem geometry, custom spring-loaded hemming tooling can be designed for:
- Mild steel
- Stainless steel
- Galvanized steel
- Aluminum sheet
- Pre-painted sheet metal
- Other sheet metal materials
Actual V-opening, hemming clearance, spring configuration and required tonnage should be confirmed according to the specific material and application.
60 mm Base for Large-Table Press Brakes
The illustrated tooling uses a 60 mm wide lower base.
This relatively wide configuration is particularly suitable for press brakes with larger lower working tables or die support surfaces.
However, this is only one mounting configuration.
For machines using different die holders, narrower bases, European-style systems or other lower-die interfaces, the tooling base can be redesigned accordingly.
Custom Spring-Loaded Hemming Tooling
The Tool Shown Is Only One Example
The tooling displayed on this page represents one specific 28° V16 spring-loaded hemming solution for approximately 2.0 mm sheet metal.
It does not represent the full range of hemming dies that we can manufacture.
We can customize:
- Acute bending angle
- V-opening
- Sheet thickness range
- Hemming clearance
- Spring configuration
- Spring force
- Overall tooling height
- Base width
- Working geometry
- Lower-die mounting interface
- Tooling length
- Segmentation
- Load capacity
- Tooling material
- Heat treatment
- Surface treatment
The tooling can be designed according to the customer's finished part drawing, material properties and actual press brake configuration.
Compatible Press Brake Tooling Systems
The mounting structure can be customized for different press brake and tooling systems.
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 manufactured according to machine specifications, existing tooling samples or customer drawings.
Custom Tooling Design Service
Special hemming applications often require tooling designed around the actual finished part rather than only around a standard catalogue specification.
Customers can provide:
- Finished part drawings
- Sheet thickness
- Material grade
- Required hem dimensions
- Bend length
- Press brake model
- Existing tooling interface
- Lower-table configuration
- Available machine tonnage
Our engineering team can evaluate the forming process and recommend a suitable custom press brake hemming tooling solution.
Important design factors include:
- Acute pre-bending angle
- V-opening
- Sheet thickness
- Material tensile strength
- Material ductility
- Springback
- Hemming clearance
- Spring configuration
- Final hem geometry
- Tooling load capacity
- Press brake tonnage
- Workpiece interference
- Lower-die mounting structure
Spring-Loaded vs. Other Hemming Tooling
| Hemming Tool Type | Initial Forming | Flattening Method | Main Structural Characteristic |
|---|---|---|---|
| Spring-Loaded Hemming Die | Acute V-bending | Movable section compresses during flattening | Internal spring return |
| U-Groove Hemming Die | Acute bending | Flattening in the same fixed groove | Fixed groove structure |
| Pneumatic Hemming Tool | Acute bending | Pneumatically assisted flattening | Air-powered mechanism |
| Separate Flattening Die | Separate acute bend | Independent flattening operation | Separate tooling process |
Related Press Brake Hemming Solutions
Depending on material thickness, part geometry and production requirements, we can provide:
- Spring-Loaded Hemming Dies
- U-Groove Hemming Dies
- Pneumatic Hemming Tools
- Two-Stage Hemming Dies
- Press Brake Flattening Dies
- Acute Angle Punches
- Custom Hemming Punches
- Special Press Brake Forming Tools
