Hemming In Sheet Metal

In sheet metal hemming means to fold the metal back on itself.

Hemming in sheet metal.

Hemming and seaming are two similar metalworking processes in which a sheet metal edge is rolled over onto itself. Hemming is a metalworking process where a sheet metal edge is mechanically bent to fit an uneven surface or simply roll over onto itself. 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. 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.

Hemming is a sheet metal forming process in which sheets are joined by bending it to 180. The two newly formed layers then lie flush with each other. Normally hemming operations are used to connect parts together to improve the appearance of a part and to reinforce part edges. Hems are commonly used to reinforce an edge hide burrs and rough edges and improve appearance.

In this process usually a sheet is bent with the help of inner sheet in three different stages. When working with a brake press hems are always created in a two step process. During this process the edge of sheet metal is folded over. Create a bend with acute angle tooling in the metal 30 is preferable but 45 will work for some circumstances.

Automotive body panels and automotive parts such as deck lids trunk lids doors hoods and tailgates are formed by hemming process. Hemming is a metalworking process that involves rolling the edge of sheet metal over and onto itself essentially creating an area of two layers.