Sheet Metal Bending Minimum Flange Length

When using a punch press or laser cutting holes should never be less than that of the material thickness.

Sheet metal bending minimum flange length.

I can now see that the minimum flange length is 8 5 mm for such a bend so i have to keep it in mind when designing. Let s say i have a 2 mm thick sheet and i want to bend it. Minimum sheet metal flange bend length 3 x sheet thickness bend radius minimum hole diameter guidelines small sized punch are more prone to failure during sheetmetal punching operation. To keep it simple i also use a 2 mm inside radius.

Choose a bend radius that matches your minimum bend. D 2 5t r. This tool allows you to determine tonnage internal radius v die opening and minimum flange you just have to insert the characteristics of the sheet metal to be bent. Minimum flange length b the minimum flange length is sometimes the most difficult limitation for new brake operators and engineers to understand.

As a rule of thumb the distance from the outside of the material to the bottom of the cutout should be equal to the minimum flange length as prescribed by the air bend force chart. Avoid large sheet metal parts with small bent flanges. During bending the sheet metal must bridge fully across the v die see figure 2. If it s not supported on both sides the sheet slides into the v opening and the bend line will slide with it.

From a bend the minimum distance is 3 times material length plus the bend radius. The lowest common bench capacity is around 100 tonnes. In low carbon steel sheet metal the minimum radius of a bend should be one half the material thickness or 0 80 mm 0 03 inch whichever is larger. A cutout or the edge of your flange to your bend.

In the fab shop the v die width in the press brake limits the size of the flange that can be bent. The required die width is 12 mm and tonnage per meter is 22. The v die is usually selected to be 5x to 8x the workpiece thickness. Therefore for softer materials the recommended minimum hole diameter is equal to sheet thickness.

Discover all our calculation tools in the calculators section of the top menu. If you have any questions or want to discuss your design contact us. When fabricating with a punch press the minimum space between two notches should be at least 2 time material thickness and at least 125. The tool can calculate the required bending force for bending aluminum stainless steel mild steel and weldox or strenx high strength steels.