In this process usually a sheet is bent with the help of inner sheet in three different stages.
Open hem sheet metal.
Hemming is a sheet metal forming process in which sheets are joined by bending it to 180.
For bends the minimum distance between the inside edge of the bend and the outside of the hem should be 5 times material thickness plus bend radius plus hem radius.
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Automotive body panels and automotive parts such as deck lids trunk lids doors hoods and tailgates are formed by hemming process.
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In sheet metal hemming means to fold the metal back on itself.
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When working with a brake press hems are always created in a two step process.
For open hem the bend will lose its roundness when the inside diameter is greater than the sheet metal thickness.