Hemmed Seam Sheet Metal

With hemming the edge of sheet metal is folded so that it becomes flush with the area onto which it s rolled.

Hemmed seam sheet metal.

Hemming is the process in which the edge is rolled flush to itself while a seam joins the edges of two materials. 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 sheet metal hemming means to fold the metal back on itself. Basically they dont work.

Rather the two layers of the folded sheet metal are joined using a seam. Create a bend with acute angle tooling in the metal 30 is preferable but 45 will work for some circumstances. Am i missing something here or are manual work arounds required when. Roller hemming is a mechanical joining technology well suitable to produce form locking linkages of large sheet structures.

This appears to be something to do with hems and seams being 180 degree bends. The video shows exemplarily how. You ll often find seams on metal roofs. This is putting a simple hem on a curved piece of zinc with a 7ft radius.

Seaming on the other hand is a metalworking process that uses a similar process of rolling sheet metal over and onto itself except it uses a seam to join the two layers. 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. There appears to be a limitation when it comes to using the miter flange and closed corner tools with hems and seams. When working with a brake press hems are always created in a two step process.

With seaming the edge of sheet metal is folded but it doesn t sit flush. Seams are commonly used in the food industry on canned goods on amusement park cars in metal roofing and in the automotive industry.