Sheet Metal Bending Inner Radius

Use this document to choose values that are both manufacturable and meet your needs.

Sheet metal bending inner radius.

Therefore the bending inner radius of our sheet metal parts is basically 0 2. Let s start with 90 degrees bend which is the most simple scenario. For ordinary low carbon steel plates rust proof aluminum plates brass plates copper plates etc the inner radius 0 2 is no problem. 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. When designing sheet metal parts and enclosures it is helpful to use these values as the basis for your design. Flat sheet 90 degrees bend angle. The sheet metal design rule of thumb in this case is.

You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. Bend radii minimum bend sizes. It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii. The bend deduction is the amount the sheet metal will stretch when bent as measured from the outside edges of the bend.

The u punch forms a u shape with a single punch. Say you re bending soft 13 ksi aluminum with a 0 984 in. In this case the minimum producible inside bend radius is 63 percent of that 0 250 in. Material thickness or 0 1575 in.

Die width and a 0 032 in radius punch. The bend radius refers to the inside radius. 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.

The slack between the wipe die and the punch plays an important role in getting a good result. As a result the wipe die also determines the bend s inner radius. It is important to make sure that the sheet is properly pushed onto the wipe die. The material thickness will be measured in decimal form not by the gauge number.

The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance. As another example say you re working with 0 125 in thick material. The formed bend radius is dependent upon the dies used the material properties and the material thickness. The bending tool has a radius of 30 mm which means that our inside bend radius r is 30 mm.