Aluminum Sheet Metal Hem

Hemming is a metalworking process where a sheet metal edge is mechanically bent to fit an uneven surface or simply roll over onto itself.

Aluminum sheet metal hem.

The gauge of course refers to the thickness of sheet metal. Hems are commonly used to reinforce an edge hide burrs and rough edges and improve appearance. Hems can be useful as a way to stiffen a sheet metal panel. And while hems or seams reinforce a sheet metal edge their main purpose is to improve appearance by hiding burrs and rough edges on metal back splashes and other sheet metal installations.

In sheet metal hemming means to fold the metal back on itself. The hem is primarily used for reinforcement safety and edge appearance figure 4. In car part production hemming is used in assembly as a secondary operation after deep drawing trimming and flanging operations to join two sheet metal parts outer and inner together. Sheet metal hemming process finds its major applications in the manufacturing of parts pertaining to the automotive parts.

Hemming is the process in which the edge is rolled flush to itself while a seam joins the edges of two materials. Hems have drawbacks however. Create a bend with acute angle tooling in the metal 30 is preferable but 45 will work for some circumstances. Minimum acute flat for aluminum mt x 2 minimum acute punch radius for aluminum minimum flat length x 2 hemming and seaming hemming and seaming are basically the same process.

This can be a serious problem because the inside of the hem is easy to wet but challenging to dry. Hemming and seaming are two similar metalworking processes in which a sheet metal edge is rolled over onto itself. With plated steel parts the interior of the hem can be very difficult to cover for corrosion control. When working with a brake press hems are always created in a two step process.

Material bend radii and minimum bend size charts. Typical parts for this type of assembly are hoods doors trunk lids and fenders. A seam is a method of joining two pieces of sheet metal together figure 5. The bend radius you select may not be available if the geometry of the part will not allow us to bend with the specific tooling required to achieve that radius.

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