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.
Open hem sheet metal.
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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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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.
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Create a bend with acute angle tooling in the metal 30 is preferable but 45 will work for some circumstances.
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 this process usually a sheet is bent with the help of inner sheet in three different stages.
Hemming is a metalworking process where a sheet metal edge is mechanically bent to fit an uneven surface or simply roll over onto itself.