Sheet Metal Bending Inner Radius

The slack between the wipe die and the punch plays an important role in getting a good result.

Sheet metal bending inner radius.

The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance. The more ductile the sheet metal the smaller the inner bend radius is possible. Because 0 125 multiplied by 63 percent gives you 0 078. The bending tool has a radius of 30 mm which means that our inside bend radius r is 30 mm.

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. Wipe bending or edge bending is another way to bend sheet metal edges. For this a bend turns sharp at a radius of 0 078 in.

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. For ordinary low carbon steel plates rust proof aluminum plates brass plates copper plates etc the inner radius 0 2 is no problem. Let s start with 90 degrees bend which is the most simple scenario. It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii.

The formed bend radius is dependent upon the dies used the material properties and the material thickness. Therefore the bending inner radius of our sheet metal parts is basically 0 2. Bend radii minimum bend sizes. Material thickness or 0 1575 in.

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. Say you re bending soft 13 ksi aluminum with a 0 984 in. When designing sheet metal parts and enclosures it is helpful to use these values as the basis for your design. It is important to make sure that the sheet is properly pushed onto the wipe die.

As a result the wipe die also determines the bend s inner radius. 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 u punch forms a u shape with a single punch.

Use this document to choose values that are both manufacturable and meet your needs. The minimum bend radius for mild steel sheet metal should be equal to the thickness. Flat sheet 90 degrees bend angle. As another example say you re working with 0 125 in thick material.