Bend Radius For Steel Sheet

In general parts should be designed with a minimum 1t bend radius radius matching the sheet thickness for the simplest setup and to ensure we can form the intended geometry.

Bend radius for steel sheet.

There are a two major factors that affect how tight you can make the internal radius of a bend in a piece of sheet metal. The minimum inside bend radius is even larger when bending with the grain. Thick grade 350 and 400 may have a minimum bend radius of 2 5 times the material thickness when transverse bending while longitudinal bending may require a minimum bend radius that s 3 75 times the material thickness see figure 1. Generally speaking the thicker a piece of sheet metal is the wider the internal bend radius will have to be.

When we calculate the bend allowance we find that it equals 457. Since commercial sheet metal bending can be done with less concern for stresses caused during forming operation the radius can be near zero for thin sheet metal. The thickness of the metal. In our example below a part with flange lengths of 2 and 3 with an inside radius of 250 at 90 will have leg lengths of 1 625 and 2 625 respectively.

10 carbon content may be bent back on itself in any direction without cracking. The hardness of the metal. Bend radii minimum bend sizes. Choose a bend radius that matches your minimum bend.

Another way to determine the k factor is by following the rule of thumb. In order to develop the flat pattern we add 457 to 1 625 and 2 625 to arrive at 4 707. But for harder materials e g. In steel between 0 5 and 0 8 in.

Sharp inside bend radius in sheetmetal parts can cause material flow problems in soft material and fracturing in hard material. We want to know the final length of the detail. First we must start with the k factor. 1 steels with lower carbon content are easier to weld and form.

A cutout or the edge of your flange to your bend. Crca inside bend radius equal to 0 65 times of sheet thickness is also enough. Grain direction is formed in metal in the direction in which the sheet was rolled at the steel mill. The bending angle is 90 sheet thickness 5 mm and the inside radius is 6 mm.

Determine your minimum bend by measuring the distance from your closest feature i e. Recommended inside bend radius for sheet metal parts should be equal to material thickness.