Sheet Metal Bending Radius

As explained in my first post the bend deduction can be calculated using the following equation.

Sheet metal bending radius.

This is done through the application of force on a workpiece. It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii. The minimum bend radius data shown in these charts is measured to the inside of the bend. The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance.

Bend radii minimum bend sizes. 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 formed bend radius is dependent upon the dies used the material properties and the material thickness. This is putting a simple hem on a curved piece of zinc with a 7ft radius.

Ossb is defined as illustrated in figure 5 for different bending angles and can be calculated using the equation below. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. Minimum sheet metal flange bend length 3 x sheet thickness bend radius. Where a is the bending angle t is the sheet thickness and r is the bending radius.

Also known as press braking flanging die bending folding and edging this method is used to deform a material to an angular shape. It shall be equal to three times of sheet thickness plus bend radius. Minimum sheet metal flange bend length is required to avoid cracks in the bending area. The bend radius refers to the inside radius.

The material thickness will be measured in decimal form not by the gauge number. The bend deduction is the amount the sheet metal will stretch when bent as measured from the outside edges of the bend. Most frequently expensive sheet metal bending tools called brakes are used to bend sheet metal but you can also complete this task without one. The bend radii listed are standard minimum if manufacturing for aircraft and aerospace applications.

When sheet metal is bent it stretches in length. Where ossb is the outside setback. Bending is one of the most common sheet metal fabrication operations.