Sheet Metal Bending Inner Radius

Die width and a 0 032 in radius punch.

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. 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. The sheet metal design rule of thumb in this case is.

The slack between the wipe die and the punch plays an important role in getting a good result. When designing sheet metal parts and enclosures it is helpful to use these values as the basis for your design. Because 0 125 multiplied by 63 percent gives you 0 078. Say you re bending soft 13 ksi aluminum with a 0 984 in.

As another example say you re working with 0 125 in thick material. In this case the minimum producible inside bend radius is 63 percent of that 0 250 in. The formed bend radius is dependent upon the dies used the material properties and the material thickness. The material thickness will be measured in decimal form not by the gauge number.

Therefore the bending inner radius of our sheet metal parts is basically 0 2. It is important to make sure that the sheet is properly pushed onto the wipe die. Flat sheet 90 degrees bend angle. As a result the wipe die also determines the bend s inner radius.

Wipe bending or edge bending is another way to bend sheet metal edges. Bend radii minimum bend sizes. The bend radius refers to the inside radius. The more ductile the sheet metal the smaller the inner bend radius is possible.

For this a bend turns sharp at a radius of 0 078 in. The minimum bend radius for mild steel sheet metal should be equal to the thickness. Let s start with 90 degrees bend which is the most simple scenario. Use this document to choose values that are both manufacturable and meet your needs.

The u punch forms a u shape with a single punch. For ordinary low carbon steel plates rust proof aluminum plates brass plates copper plates etc the inner radius 0 2 is no problem. It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii. The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance.