Press Brake Tooling for Folded Edges
Custom Hemming Die
Press Brake Tooling for Folded Edges
Many customers face the same problem when producing folded sheet metal edges: the edge is not fully closed, the surface has visible press marks, or the finished part becomes difficult to assemble.
The operator may adjust the press brake several times, but the result still changes from one part to another. In many cases, the problem is not only the machine setting. The real issue is whether the hemming die and hemming punch are suitable for the material thickness, edge length, and forming requirement.
What Is a Hemming Die?
A hemming die is a special sheet metal bending die used to fold and flatten sheet metal edges. It is commonly used when the workpiece needs a closed edge, safer edge, reinforced flange, or cleaner appearance.
Compared with a sharp exposed edge, a folded edge can improve safety, strength, and product appearance. This is why hemming is widely used for cabinets, enclosures, machine covers, door panels, appliance parts, and visible sheet metal components.
How a Hemming Punch Works
A hemming punch works together with the lower hemming die to complete the edge flattening process. In many cases, the sheet metal edge is first bent to an acute angle, then pressed flat in the hemming stage.
If the hemming punch angle, contact surface, or lower die clearance is not correct, the workpiece may crack, shift, or show deep marks during flattening. For stainless steel, aluminum, galvanized sheet, and coated panels, the tooling contact area becomes even more important.
Press Brake Forming Dies for Edge Flattening
Standard V dies are mainly used for common bending angles, but they may not be suitable for closing folded edges. Hemming requires controlled pressure and proper support, especially when the edge length is long or the surface requirement is high.
Custom press brake forming dies can help improve edge consistency, reduce repeated positioning, and make batch production more stable. A properly designed hemming die can also reduce surface damage and help the finished part match the drawing more closely.
Custom Sheet Metal Bending Die Solution
Every hemming project may have different requirements. Material thickness, hem size, flange length, bending angle, surface finish, and press brake clamping system can all affect the tooling design.
Shengpu Tooling provides custom press brake tooling for sheet metal bending, hemming, flattening, and non-standard forming applications. We can design the tooling based on your product drawing, sample photo, material thickness, and production requirement.
When Do You Need a Custom Hemming Die?
You may need a custom hemming die when your product requires:
Closed sheet metal edges.
Safer folded edges.
Reinforced flanges.
Cabinet and enclosure panels.
Machine covers and door panels.
Better appearance on visible parts.
Stable quality in batch production.
If your current tooling cannot close the edge smoothly, or if the surface is damaged during the hemming process, a custom hemming die may be the right solution.
Shengpu Tooling Solution
Shengpu Tooling manufactures custom hemming die, hemming punch, sheet metal bending die, press brake forming dies, upper punches, lower dies, radius dies, offset dies, louver dies, hinge dies, and other special-shaped tooling.
Before manufacturing, our team can review your drawing, material thickness, hem size, flange length, bending angle, surface requirement, and machine information. Based on these details, we help provide a practical tooling solution for your production.
Contact Shengpu Tooling
Need a custom hemming die for folded sheet metal edges?
Send us your product drawing, sample photo, material thickness, and forming requirements. Shengpu Tooling will help check the tooling structure and provide a suitable solution.
WhatsApp Business: +86 15155556086
Email: leah@sinobend.com
Website: shengputooling.com
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