28° V12 Spring-Loaded Hemming Die for 1.5 mm Sheet Metal
A custom spring-loaded press brake hemming die designed for two-stage acute bending and flattening of approximately 1.5 mm sheet metal. The tooling shown features a 28° V12 opening, a 60 mm wide lower base, an overall tooling height of approximately 150 mm, and a maximum rated load capacity of 100 ton/m. During hemming, the spring-supported moving section allows the tooling to transition from the initial acute bending operation to the final flattening stage. After the press brake ram retracts, the internal springs automatically return the moving section to its original position. The V-opening, angle, tooling height, base width, hemming clearance and lower-die mounting interface can all be customized according to the workpiece and press brake system.
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Description
28° V12 Spring-Loaded Hemming Die for 1.5 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 incorporates a 28° V12 acute bending opening together with a spring-supported movable die structure.
During the first operation, the sheet metal edge is formed to an acute angle using the V12 opening.
For the second operation, the pre-bent edge is repositioned into the flattening section of the tooling. As the press brake ram moves downward, the movable section is compressed against the internal spring system, allowing the tooling to flatten the folded edge.
After the ram retracts, the springs expand and return the movable section to its initial working position.
This configuration combines acute bending, flattening and automatic mechanical return in one compact press brake hemming tool assembly.
Two-Stage Hemming Process
First Operation – 28° Acute Pre-Bending
The first press brake stroke forms the sheet in the 28° V12 opening.
This creates the acute preliminary bend required before the final hemming operation.
Second Operation – Spring-Assisted Flattening
The pre-bent flange is then repositioned into the flattening area.
During the second stroke, the press brake applies the required forming force while the movable die section compresses the internal springs.
The folded edge is progressively flattened until the required hem geometry is achieved.
Automatic Spring Return
When the press brake ram retracts, the stored spring force returns the movable tooling section to its original position.
The tool is then ready for the next forming cycle.
Key Features
28° Acute Bending Geometry
The tooling shown incorporates a 28° acute V-opening for the first bending operation.
V12 Opening
The illustrated version uses a 12 mm V-opening, designed for the specified 1.5 mm sheet metal hemming application.
Designed for 1.5 mm Sheet Metal
This configuration is typically used for approximately 1.5 mm sheet thickness, subject to material grade, tensile strength, hem geometry and bending length.
Spring-Loaded Moving Structure
Internal springs support the movable tooling section and enable automatic return after the flattening cycle.
Integrated Acute Bending and Flattening
The tooling combines the initial acute bending function and the final flattening function in one assembly.
No Pneumatic System Required
The mechanical spring structure does not require an external compressed-air supply or pneumatic control system.
60 mm Wide Base
The illustrated lower die uses a 60 mm base width, making this configuration particularly suitable for press brakes with relatively large lower worktables or die support surfaces.
100 ton/m Rated Load
Maximum rated tooling load:
100 ton/m
Technical Specifications
| Parameter | Specification |
|---|---|
| Tool Type | Spring-Loaded Hemming Die |
| Tooling Function | Acute Pre-Bending + Flattening |
| Pre-Bending Angle | 28° |
| V Opening | V12 |
| Overall Tooling Height | 150 mm |
| Base Width | 60 mm |
| Designed Sheet Thickness | Approx. 1.5 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 forming process in two separate press brake strokes.
First, the sheet metal is bent to an acute angle using the 28° V12 opening.
The pre-bent workpiece is then repositioned for flattening.
During the second press brake stroke, the moving section of the hemming die is compressed while the press brake applies the forming force required to flatten the folded edge.
The internal springs provide mechanical support during movement and automatically reset the tooling after the press brake ram returns.
This structure provides a practical mechanical hemming solution without requiring pneumatic cylinders or other external actuating systems.
Advantages of the Spring-Loaded Hemming Structure
Integrated Two-Stage Forming
Acute bending and final flattening functions are integrated into one hemming die assembly.
Automatic Mechanical Reset
Internal springs automatically restore the movable section after each cycle.
No External Air Supply
The spring-loaded structure eliminates the need for pneumatic cylinders, air hoses or compressed-air control components.
Suitable for Repetitive Hemming Operations
Automatic spring return improves convenience during repeated production cycles.
Compact Tooling Design
The acute bending and flattening functions are incorporated into one tooling structure rather than requiring completely independent tooling systems.
Flexible Customization
The tooling geometry and mounting structure can be adapted to different sheet materials, thicknesses, press brakes and final hem requirements.
Typical Applications
This spring-loaded press brake hemming die can be used for sheet metal components requiring folded, closed or flattened edges, including:
- Electrical enclosures
- Control cabinets
- Electrical cabinet doors
- Sheet metal housings
- Equipment covers
- Stainless steel panels
- Appliance panels
- Sheet metal boxes
- Machine covers
- Industrial equipment panels
- Light-gauge fabricated components
- Custom enclosure fabrication
Suitable Materials
Depending on material strength, ductility, 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, flattening clearance, spring configuration and required press brake tonnage should be determined according to the specific material and application.
60 mm Base for Large-Table Press Brakes
The tooling shown uses a 60 mm wide lower base.
This relatively wide base configuration is particularly suitable for press brakes with larger lower working tables or die support surfaces.
However, the 60 mm base shown is only one configuration.
For machines using narrower supports, different mounting grooves or other lower-die installation systems, the base geometry 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° V12 spring-loaded hemming solution for approximately 1.5 mm sheet metal.
It does not represent the full range of press brake hemming tools 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
Different structures can be developed according to the customer's workpiece drawing and actual bending requirements.
Compatible Press Brake Tooling Systems
The mounting structure of the hemming die 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 interfaces can also be manufactured according to machine specifications, existing tooling samples or customer drawings.
Custom Tooling Design Service
Special hemming applications often require more than simply selecting a standard V-opening from a tooling catalogue.
Customers can provide us with:
- Finished part drawings
- Sheet thickness
- Material grade
- Hem dimensions
- Bend length
- Press brake model
- Existing tooling interface
- Lower table configuration
- Available machine tonnage
Our engineering team can evaluate the complete forming process and recommend an appropriate custom press brake hemming tooling solution.
Important design factors include:
- Pre-bending angle
- V-opening
- Material thickness
- Material tensile strength
- Springback
- Hemming clearance
- Spring configuration
- Final hem geometry
- Tooling load capacity
- Available 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 | Moving section compresses during flattening | Internal spring return |
| U-Groove Hemming Die | Acute bending | Flattening in the same fixed U-groove | Fixed groove structure |
| Pneumatic Hemming Tool | Acute bending | Pneumatically assisted flattening | Air-powered mechanism |
| Separate Flattening Die | Separate acute bending | Independent flattening operation | Separate tooling process |
Related Press Brake Hemming Solutions
Depending on sheet thickness, material properties and production requirements, we can provide different hemming solutions, including:
- 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
