28° V14 Spring-Loaded Hemming Die for 1.8 mm Sheet Metal
A custom spring-loaded press brake hemming die designed for acute pre-bending and final flattening of approximately 1.8 mm sheet metal. The tooling shown features a 28° V14 opening, an overall height of approximately 150 mm, a 60 mm wide base, and a maximum rated load capacity of 100 ton/m. The internal spring-supported structure assists the movement of the flattening section and automatically returns the tooling after the press brake ram retracts. This allows acute pre-bending and final hemming to be completed within one spring-loaded tooling assembly without requiring a pneumatic system. The angle, V-opening, overall height, base width, hemming clearance and lower-die mounting structure can all be customized according to the workpiece and press brake configuration.
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Description
28° V14 Spring-Loaded Hemming Die for 1.8 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 tooling shown incorporates a 28° V14 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 V14 opening.
For the second operation, the pre-bent workpiece is repositioned into the flattening area. As the press brake ram moves downward, the movable tooling section is compressed while the machine provides the force required to flatten the folded edge.
After the ram retracts, the internal springs return the movable section to its original position, preparing the tooling for the next production cycle.
This mechanical two-stage design integrates acute bending, flattening and automatic return in one compact press brake hemming tool.
Two-Stage Hemming Process
First Operation – 28° Acute Pre-Bending
In the first press brake stroke, the sheet is bent using the 28° V14 opening.
This produces the acute preliminary bend required before the final hemming operation.
Second Operation – Spring-Assisted Flattening
The pre-bent edge is then positioned in the flattening section of the tooling.
During the second stroke, the press brake applies the required forming load while the movable die section compresses against the spring system.
The folded edge is progressively flattened until the required hem geometry is achieved.
Automatic Spring Return
When the ram retracts, the stored spring force restores the movable tooling section to its initial position.
This automatic mechanical return makes the tooling ready for the next cycle without requiring pneumatic actuation.
Key Features
28° Acute Bending Geometry
The first forming operation uses a 28° acute V-opening.
V14 Opening
The illustrated version uses a 14 mm V-opening, matched to the specified 1.8 mm sheet metal application.
Designed for 1.8 mm Sheet Metal
This tooling configuration is typically used for approximately 1.8 mm sheet thickness, subject to material grade, tensile strength, hem geometry and bend length.
Spring-Loaded Moving Structure
Internal springs support the movable tooling section and allow automatic reset after the flattening operation.
Integrated Acute Bending and Flattening
Both forming functions are incorporated into one hemming die assembly.
No Pneumatic System Required
The spring structure operates mechanically and does not require compressed air or pneumatic cylinders.
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.
Maximum Rated Load: 100 ton/m
The tooling is rated for a maximum load of 100 ton/m, subject to actual working length, material strength 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 | V14 |
| Overall Tooling Height | 150 mm |
| Base Width | 60 mm |
| Designed Sheet Thickness | Approx. 1.8 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 press brake operations.
First, the sheet metal is bent to an acute angle using the 28° V14 opening.
The pre-bent flange is then repositioned into the flattening area.
During the second operation, the press brake ram applies the required forming force while the moving section of the tooling travels against the internal spring system.
The folded edge is flattened to the required final condition.
After the press brake ram retracts, the springs restore the moving tooling section to its original position.
This structure provides a practical mechanical hemming solution for repetitive production without relying on an external pneumatic system.
Advantages of the Spring-Loaded Hemming Structure
Integrated Two-Stage Forming
The same tooling assembly performs both acute pre-bending and final flattening.
Automatic Mechanical Reset
The internal spring system returns the movable section automatically after each cycle.
No External Air Supply Required
No pneumatic cylinder, air hose or compressed-air control system is required.
Suitable for Repetitive Production
Automatic spring return makes the tool convenient for repeated hemming operations.
Compact Tooling Arrangement
The acute bending and flattening functions are integrated into one tooling structure.
Flexible Customization
The V-opening, angle, base width, tooling height and mounting interface can all be adapted to different applications.
Typical Applications
This spring-loaded press brake hemming tool can be used for sheet metal components 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
- 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, hemming clearance, spring configuration and required tonnage should be confirmed according to the specific material and part geometry.
60 mm Base for Large-Table Press Brakes
The illustrated tooling uses a 60 mm wide lower base.
This relatively wide base is suitable for press brakes with larger lower working tables or die support surfaces.
However, this 60 mm configuration is only one example.
For machines using narrower bases, different mounting grooves, European-style systems or other lower-die interfaces, the tooling base and installation structure can be redesigned accordingly.
Custom Spring-Loaded Hemming Tooling
The Tool Shown Is Only One Example
The tooling shown on this page represents one specific 28° V14 spring-loaded hemming solution for approximately 1.8 mm sheet metal.
It does not represent the full range of 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
The tooling can be designed according to the customer's finished part drawing, material 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, customer drawings or existing tooling samples.
Custom Tooling Design Service
Special hemming applications often require tooling designed around the finished part rather than only around a standard catalogue dimension.
Customers can provide:
- Finished part drawings
- Sheet thickness
- Material grade
- Required hem dimensions
- Bend length
- Press brake model
- Lower-table configuration
- Existing tooling interface
- Available press brake tonnage
Our engineering team can evaluate the complete bending and flattening sequence and recommend a suitable custom press brake hemming solution.
Important design factors include:
- Acute pre-bending angle
- V-opening
- Material thickness
- Material tensile strength
- 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 sheet thickness, material properties 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
