Hem Flange, Open
Sheet edges are often folded over, or “hemmed” like a pair of trousers. This produces a bend whose flanges are parallel to each other. Hemming increases the rigidity of the finished part and provides edge protection. Interlocking hems are also frequently employed in lock seams for joining parts.
Hemming is performed in two steps. First, the operator makes an initial bend of 30 degrees. Next, the work piece is repositioned in the tool, and the machine flattens the fold.
In open hemming, the flanges are not pressed together completely. A space is left in the radius of the bend. Hemming depends on the amount of pressure applied to the part.
The data came from a MTI Engineer experienced in FAB processes and has performed many time studies in this area of work.
User Input
1. Select "Gage Number"
The thickness of the sheet metal is called its gage. The gage of sheet metal ranges from 36 gage to 3 gage. The higher the gage, the thinner the metal is. If you don't know the gage number, select 16 (.0598) from the list for now. The actual decimal size will appear on the next line. You can then go back and reselect until the decimal size you want appears on the screen.
2. Enter "Length of Part".
3. Enter "Width of Part".
4. Enter the "# of Hems".
5. The program will calculate the part weight for informational use only.
6. The Final "Time per Piece" will be for the total number of Hems made to the part here.
Blog
LinkedIn
Facebook
YouTube
Twitter
