Hemmed Seam Sheet Metal

Roller hemming is a mechanical joining technology well suitable to produce form locking linkages of large sheet structures.

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. Am i missing something here or are manual work arounds required when. Hemming and seaming are two similar metalworking processes in which a sheet metal edge is rolled over onto itself. Basically they dont work.

Seams are commonly used in the food industry on canned goods on amusement park cars in metal roofing and in the automotive industry. The edges of metal. This appears to be something to do with hems and seams being 180 degree bends. Hemming is the process in which the edge is rolled flush to itself while a seam joins the edges of two materials.

In sheet metal hemming means to fold the metal back on itself. Create a bend with acute angle tooling in the metal 30 is preferable but 45 will work for some circumstances. Hems are commonly used to reinforce an edge hide burrs and rough edges and improve appearance. There appears to be a limitation when it comes to using the miter flange and closed corner tools with hems and seams.

This is putting a simple hem on a curved piece of zinc with a 7ft radius. When working with a brake press hems are always created in a two step process. The video shows exemplarily how. 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.

You ll often find seams on metal roofs. 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.