Sheet Metal Bending Minimum Flange Length

Choose a bend radius that matches your minimum bend.

Sheet metal bending minimum flange length.

The lowest common bench capacity is around 100 tonnes. If it s not supported on both sides the sheet slides into the v opening and the bend line will slide with it. Brittle materials may require v dies in the 8x to 12x range. When fabricating with a punch press the minimum space between two notches should be at least 2 time material thickness and at least 125.

Let s say i have a 2 mm thick sheet and i want to bend it. In the fab shop the v die width in the press brake limits the size of the flange that can be bent. A cutout or the edge of your flange to your bend. The v die is usually selected to be 5x to 8x the workpiece thickness.

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. 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. From a bend the minimum distance is 3 times material length plus the bend radius. Minimum flange length b the minimum flange length is sometimes the most difficult limitation for new brake operators and engineers to understand.

During bending the sheet metal must bridge fully across the v die see figure 2. The required die width is 12 mm and tonnage per meter is 22. Discover all our calculation tools in the calculators section of the top menu. Until the bend is completed the sheet metal must be supported on both sides of the v opening.

D 2 5t r. Avoid large sheet metal parts with small bent flanges. Therefore for softer materials the recommended minimum hole diameter is equal to sheet thickness. Determine your minimum bend by measuring the distance from your closest feature i e.

To keep it simple i also use a 2 mm inside radius. 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. 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. If you have any questions or want to discuss your design contact us.