Hemming Operation In Sheet Metal

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. When working with a brake press hems are always created in a two step process. Hemming is the process in which the edge is rolled flush to itself while a seam joins the edges of two materials.

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During this process the edge of sheet metal is folded over.

Hemming operation in sheet metal.

Hemming is a sheet metal forming process in which sheets are joined by bending it to 180. Create a bend with acute angle tooling in the metal 30 is preferable but 45 will work for some circumstances. Seams are commonly used in the food industry on canned goods on amusement park cars in metal roofing and in the automotive industry. Hemming is a metalworking process that involves rolling the edge of sheet metal over and onto itself essentially creating an area of two layers.

Hems do more than just eliminate sharp edges. The two newly formed layers then lie flush with each other. In this process usually a sheet is bent with the help of inner sheet in three different stages. Automotive body panels and automotive parts such as deck lids trunk lids doors hoods and tailgates are formed by hemming process.

Hems are commonly used to reinforce an edge hide burrs and rough edges and improve appearance. Hemming and seaming are two similar metalworking processes in which a sheet metal edge is rolled over onto itself. They also increase the part s edge stiffness and improve the edges dimensional accuracy. Hemming is used widely in sheet metal operations.

Four types of hems are the flattened hem open hem teardrop hem and rope hem seefigure 1. Normally hemming operations are used to connect parts together to improve the appearance of a part and to reinforce part edges. In sheet metal hemming means to fold the metal back on itself. Sheet metal is available in a variety of gauges.

A hem is a flange that has been bent more than 180 degrees.