Sheet Metal Bending Radius

Where a is the bending angle t is the sheet thickness and r is the bending radius.

Sheet metal bending radius.

The force must exceed the material s yield strength to achieve a plastic deformation. The bend deduction is the amount the sheet metal will stretch when bent as measured from the outside edges of the bend. 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. As explained in my first post the bend deduction can be calculated using the following equation.

It shall be equal to three times of sheet thickness plus bend radius. It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii. This is done through the application of force on a workpiece. Use this document to choose values that are both manufacturable and meet your needs.

Bending sheet metal by hand is a manageable task if the piece of sheet metal is small and thin enough to handle. The formed bend radius is dependent upon the dies used the material properties and the material thickness. Ossb is defined as illustrated in figure 5 for different bending angles and can be calculated using the equation below. The material thickness will be measured in decimal form not by the gauge number.

When sheet metal is bent it stretches in length. Bending is one of the most common sheet metal fabrication operations. Bend radii minimum bend sizes. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k.

Most frequently expensive sheet metal bending tools called brakes are used to bend sheet metal but you can also complete this task without one. Also known as press braking flanging die bending folding and edging this method is used to deform a material to an angular shape. Minimum sheet metal flange bend length 3 x sheet thickness bend radius. The minimum bend radius data shown in these charts is measured to the inside of the bend.

The bend radii listed are standard minimum if manufacturing for aircraft and aerospace applications. Where ossb is the outside setback. The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance.