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Open hem sheet metal.
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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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.
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Hemming is a sheet metal forming process in which sheets are joined by bending it to 180.
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For open hem the bend will lose its roundness when the inside diameter is greater than the sheet metal thickness.
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 where a sheet metal edge is mechanically bent to fit an uneven surface or simply roll over onto itself.
In this process usually a sheet is bent with the help of inner sheet in three different stages.
Create a bend with acute angle tooling in the metal 30 is preferable but 45 will work for some circumstances.