What is Sheet Metal Hem

What is a Sheet Metal Hem?

A sheet metal hem is a folded edge on a piece of sheet metal, created by bending it back onto itself. This process is primarily used to create a rounded, safe edge, as the original cut edge of sheet metal can be very sharp. Hemming also serves to strengthen and stiffen the edge of the part, improving its durability and resistance to bending.

why is it used in metal fabrication

sheet metal edge reinforcement

Types of sheet metal hems

Closed Hem: The metal is folded completely flat against itself. This is often done when space is limited and provides a clean, safe edge.
Open Hem: A small, open gap is left in the fold. This type of hem is often used when a wire or another piece of material needs to be inserted into the folded edge.
Teardrop Hem: The metal is folded into a teardrop or C-shape. This creates a softer, more rounded edge than a closed hem.
Rolled Hem: This involves creating a curled or circular edge on the sheet metal. This is common in applications where a very smooth, rounded edge is required for safety or aesthetics.

Sheet metal Hemming process 

Detailed guide to setting up a Two-Stage Hemming Die Set.

• a perfect Pre-Bending Angle for hemming
• Calculating the required Tonnage for the flattening step of hemming
• The role of the Springback angle in the initial bend

Hemming VS Seaming

Application of the Sheet metal Hems

Hemming is a specialized and precise process within sheet metal fabrication, commonly used in the automotive and appliance industries.

Sheet Metal hemming tooling shipment to Chile

Acute Hemming Punch 30 degree, size:1600x132x26mm

Hemming Die 1, size:1600x80x51.7mm ， Heming Die 2, size:1600x76x60mm

1 package 109kgs, size:1670x170x190mm, From Shanghai China to Chile

How to make a sheet metal hem

How hemming increases edge stiffness and safety in sheet metal.Ideal sheet metal thickness ranges for successful hemming operations

1.Detailed guide to setting up a Two-Stage Hemming Die Set.

2. Using Hemming Joggles and Hemming Punches for partial hems

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