Sheet Metal Bending Inner Radius

You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k.

Sheet metal bending inner radius.

Bend radii minimum bend sizes. For ordinary low carbon steel plates rust proof aluminum plates brass plates copper plates etc the inner radius 0 2 is no problem. Because 0 125 multiplied by 63 percent gives you 0 078. It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii.

The u punch forms a u shape with a single punch. Therefore the bending inner radius of our sheet metal parts is basically 0 2. Bend radii and minimum bends are limited to certain values or ranges which are determined by the equipment and tooling combinations available to the manufacturer. When designing sheet metal parts and enclosures it is helpful to use these values as the basis for your design.

The minimum bend radius for mild steel sheet metal should be equal to the thickness. Wipe bending or edge bending is another way to bend sheet metal edges. The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance. It is important to make sure that the sheet is properly pushed onto the wipe die.

The bending tool has a radius of 30 mm which means that our inside bend radius r is 30 mm. As another example say you re working with 0 125 in thick material. The bend deduction is the amount the sheet metal will stretch when bent as measured from the outside edges of the bend. Just as a starting point you calculate the inside bend radius at 16 percent of the die opening to be 0 157 in though this is for 60 ksi material so you ll need to adapt to the material type.

Material thickness or 0 1575 in. Say you re bending soft 13 ksi aluminum with a 0 984 in. Die width and a 0 032 in radius punch. In this case the minimum producible inside bend radius is 63 percent of that 0 250 in.

The material thickness will be measured in decimal form not by the gauge number. Let s start with 90 degrees bend which is the most simple scenario. The bend radius refers to the inside radius. The sheet metal design rule of thumb in this case is.

The more ductile the sheet metal the smaller the inner bend radius is possible. The slack between the wipe die and the punch plays an important role in getting a good result. The formed bend radius is dependent upon the dies used the material properties and the material thickness. As a result the wipe die also determines the bend s inner radius.