Sheet Metal Bending Inner Radius

Flat sheet 90 degrees bend angle.

Sheet metal bending inner radius.

This tool allows you to determine tonnage internal radius v die opening and minimum flange you just have to insert the characteristics of the sheet metal to be bent. The bending angle is 90 sheet thickness 5 mm and the inside radius is 6 mm. The bending tool has a radius of 30 mm which means that our inside bend radius r is 30 mm. Thick grade 350 and 400 may have a minimum bend radius of 2 5 times the material thickness when transverse bending while longitudinal bending may require a minimum bend radius that s 3 75 times the material thickness see figure 1.

In fact the manufacturer s bending knives usually have a rounded corner of 0 3 and a small number of bending knives have a rounded corner of 0 5. 0 972 0 16 the inside bend radius changes to 0 155. Bend radii minimum bend sizes. Minimum bend includes minimum closeness of cutout to bend radius cold rolled steel 14 gauge 0 075 1 91mm.

The minimum inside bend radius is even larger when bending with the grain. Let s start with 90 degrees bend which is the most simple scenario. The material thickness will be measured in decimal form not by the gauge number. Use this document to choose values that are both manufacturable and meet your needs.

0 551 0 16 the inside bend radius changes to 0 088. We want to know the final length of the detail. First we must start with the k factor. Discover all our calculation tools in the calculators section of the top menu.

Therefore the bending inner radius of our sheet metal parts is basically 0 2. The minimum bend radius for mild steel sheet metal should be equal to the thickness. If the die opening is 0 551 in. The sheet metal design rule of thumb in this case is.

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. In steel between 0 5 and 0 8 in. The data in the above table is the preferred data and is for reference only.

You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii.