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.

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. Determine your minimum bend by measuring the distance from your closest feature i e. 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. If it s not supported on both sides the sheet slides into the v opening and the bend line will slide with it. During bending the sheet metal must bridge fully across the v die see figure 2. Minimum flange length b the minimum flange length is sometimes the most difficult limitation for new brake operators and engineers to understand.

From a bend the minimum distance is 3 times material length plus the bend radius. Choose a bend radius that matches your minimum bend. Therefore for softer materials the recommended minimum hole diameter is equal to sheet thickness. If you have any questions or want to discuss your design contact us.

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. Brittle materials may require v dies in the 8x to 12x range. 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. The tool can calculate the required bending force for bending aluminum stainless steel mild steel and weldox or strenx high strength steels.

D 2 5t r. The v die is usually selected to be 5x to 8x the workpiece thickness. The lowest common bench capacity is around 100 tonnes. Let s say i have a 2 mm thick sheet and i want to bend it.

Discover all our calculation tools in the calculators section of the top menu. Avoid large sheet metal parts with small bent flanges. Until the bend is completed the sheet metal must be supported on both sides of the v opening. When fabricating with a punch press the minimum space between two notches should be at least 2 time material thickness and at least 125.