28° V16 Single-V Spring-Loaded Hemming Die for 2 mm Sheet Metal
A custom single-V 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, a single-V lower die mounting structure, an overall tooling height of approximately 140 mm, and a lower die width of approximately 70 mm. Maximum rated load capacity is 100 ton/m. Unlike the wider flat-base hemming die configuration, this version uses a single-V lower die interface, allowing it to fit press brakes or die holders designed around this type of lower tooling installation. The acute angle, V-opening, overall height, lower die width, spring configuration and mounting interface can all be customized according to the customer's workpiece and press brake system.
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Description
28° V16 Single-V 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 second-stage flattening or hemming operation.
The illustrated tooling combines a 28° V16 acute bending opening with a spring-supported movable section and a single-V lower die mounting structure.
During the first press brake 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. As the press brake ram moves downward, the movable section compresses against the spring system while the machine provides the forming force required to flatten the folded edge.
After the ram retracts, the internal springs return the movable section to its original position.
This configuration provides the same two-stage hemming function as other spring-loaded hemming dies while using a different lower-die installation geometry to suit specific press brake tables or die holders.
Two-Stage Hemming Process
First Operation – 28° Acute Pre-Bending
The first forming stage uses the 28° V16 opening to create the acute preliminary bend.
This establishes the required intermediate geometry before the final flattening operation.
Second Operation – Spring-Assisted Flattening
The pre-bent flange is then repositioned into the flattening section of the tooling.
During the second stroke, the press brake applies the required forming force while the movable tooling section travels against the internal spring system.
The folded edge is progressively compressed until the required hem geometry is achieved.
Automatic Spring Return
When the press brake ram retracts, the internal spring system pushes the movable section back to its initial position.
The tooling is then ready for the next cycle.
Key Features
28° Acute Bending Geometry
The tooling uses a 28° acute angle for the initial pre-bending operation.
V16 Opening
The illustrated configuration features a 16 mm V-opening, typically matched to approximately 2.0 mm sheet metal for this application.
Designed for 2 mm Sheet Metal
The tooling shown is designed for approximately 2.0 mm sheet thickness, subject to material properties, bend length and required hem geometry.
Spring-Loaded Moving Structure
Internal springs support the moving die section and automatically return it after the flattening cycle.
Single-V Lower Die Structure
The lower tooling uses a single-V mounting profile, distinguishing it from wider flat-base lower dies.
70 mm Lower Die Width
The illustrated lower die is approximately 70 mm wide.
100 ton/m Rated Load
Maximum rated tooling load:
100 ton/m
No Pneumatic System Required
The tooling operates mechanically and does not require compressed air or pneumatic cylinders.
Technical Specifications
| Parameter | Specification |
|---|---|
| Tool Type | Spring-Loaded Hemming Die |
| Lower Die Structure | Single-V / 1V Type |
| Tooling Function | Acute Pre-Bending + Flattening |
| Pre-Bending Angle | 28° |
| V Opening | V16 |
| Overall Tooling Height | 140 mm |
| Lower Die Width | 70 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 Structures | Available |
| Custom Mounting Interfaces | Available |
Working Principle
The spring-loaded hemming die completes the hemming process in two separate press brake strokes.
First, the workpiece is bent to an acute angle using the 28° V16 opening.
The pre-bent flange is then repositioned for flattening.
During the second stroke, the press brake ram provides the main forming force while the moving section of the die compresses against the internal spring system.
The folded edge is flattened to the required final condition.
When the ram retracts, the springs restore the movable tooling section to its original working position.
This structure combines acute bending, flattening and automatic mechanical reset in one hemming die assembly.
Single-V Lower Die Mounting Structure
The lower die shown on this page uses a single-V, or 1V, mounting structure.
Compared with a wider flat-base lower die, the single-V design uses a more defined lower mounting profile and can be adapted to press brakes or die holders designed for this type of tooling interface.
This lower die structure does not change the basic hemming principle, but it changes how the tooling is supported and installed on the press brake.
The mounting profile can be redesigned according to the customer's machine, die holder, lower table or existing tooling system.
Advantages of the Single-V Spring-Loaded Hemming Die
Different Lower Die Installation Option
The single-V lower die provides an alternative mounting solution for press brakes using this type of lower tooling interface.
Integrated Two-Stage Hemming
Acute bending and final flattening are combined in one tooling assembly.
Automatic Mechanical Reset
The internal spring system returns the movable section after each cycle.
No External Air Supply
No pneumatic cylinder, compressed-air line or external pneumatic control system is required.
Suitable for Repetitive Production
The automatic spring-return mechanism improves convenience during repeated hemming operations.
Flexible Mounting Customization
The lower die structure can be modified according to different press brake tables, die holders and installation methods.
Typical Applications
This spring-loaded hemming die can be used for sheet metal components requiring folded, closed or flattened edges, including:
- Electrical enclosures
- Control cabinets
- Cabinet doors
- Sheet metal housings
- Machine covers
- Equipment panels
- Stainless steel components
- Appliance panels
- Sheet metal boxes
- Fabricated steel parts
- Industrial enclosures
- Custom sheet metal products
Suitable Materials
Depending on material grade, tensile strength, ductility and final hem geometry, this tooling can be designed for:
- Mild steel
- Stainless steel
- Galvanized steel
- Aluminum sheet
- Pre-painted sheet metal
- Other sheet metal materials
Actual tooling geometry, V-opening, hemming clearance and spring configuration should be confirmed according to the specific application.
Custom Single-V Spring-Loaded Hemming Tooling
The Tool Shown Is Only One Example
The tooling displayed on this page represents one specific 28° V16 single-V 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
- Lower die width
- Lower mounting profile
- Base structure
- Tooling length
- Segmentation
- Load capacity
- Tooling material
- Heat treatment
- Surface treatment
The tooling can be designed according to the customer's part drawing 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, tooling samples or customer drawings.
Custom Tooling Design Service
For special hemming applications, the lower die mounting structure can be just as important as the acute angle or V-opening.
Customers can provide:
- Finished part drawings
- Sheet thickness
- Material grade
- Hem dimensions
- Bend length
- Press brake model
- Lower table dimensions
- Existing lower die interface
- Tooling samples
- Available press brake tonnage
Our engineering team can evaluate the complete forming process and recommend an appropriate custom spring-loaded hemming tooling solution.
Important design factors include:
- Acute pre-bending angle
- V-opening
- Sheet thickness
- Material tensile strength
- Hemming clearance
- Spring configuration
- Final hem geometry
- Lower die support structure
- Mounting interface
- Tooling strength
- Press brake tonnage
- Workpiece interference
Single-V vs. Wide-Base Spring-Loaded Hemming Dies
| Feature | Single-V Spring-Loaded Hemming Die | Wide-Base Spring-Loaded Hemming Die |
|---|---|---|
| Hemming Principle | Two-stage spring-loaded hemming | Two-stage spring-loaded hemming |
| Acute Bending | Yes | Yes |
| Spring Return | Yes | Yes |
| Lower Die Interface | Single-V / 1V profile | Wide flat-base structure |
| Typical Selection Factor | Machine / die-holder interface | Lower table support width |
| Customization | Available | Available |
Related Press Brake Hemming Solutions
Depending on sheet thickness, mounting structure and production requirements, we can provide:
- Single-V Spring-Loaded Hemming Dies
- Wide-Base 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
