Sheet Metal Bend Radius Vs Thickness

If you are working with a material thickness of 0 100 in multiply that by 0 63 to get a minimum inside bend radius of 0 063 in.

Sheet metal bend radius vs thickness.

In a previous bending basics article you mention a material s tensile reduction percentage used for calculating the minimum inside bend radius of various metals. The bending angle is 90 sheet thickness 5 mm and the inside radius is 6 mm. Now multiply that answer by the plate thickness. We want to know the final length of the detail.

It is possible to choose other bends if you require but additional lead time and tooling charges may apply. It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii. If minimum flange requirement is too close you can choose r t 2 also and suitable die. The tables below show bend radii and minimum bend sizes for materials and tooling combinations stocked by protocase.

When sheet metal is bent it stretches in length. 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. First we must start with the k factor.

For this material this is the minimum producible inside radius with air forming. Generally speaking the thicker a piece of sheet metal is the wider the internal bend radius will have to be. Let s say you have a similar part to the one on the image above it has a straight leg of 20 mm and another of 70 mm. Finding the true minimum bend radius for steel or aluminum plate requires a little research.

We go beyond the general rules of sheet metal bending as our customers want tight bend radii for sheet metal parts. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. Divide 50 by the material s reduction percentage as specified by the material supplier subtract by 1 and then multiply by the plate thickness. Use this document to choose values that are both manufacturable and meet your needs.

The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance. The hardness of the metal. You described a rough rule to find a steel s minimum bend radius. Note that this is just a rule of thumb.

The thickness of the metal. The bend radius refers to the inside radius. So in this case the minimum inside bend radius is 2 times the material thickness. Similarly the harder a piece of metal is the more room you ll have to allocate for the bend as well or risk fracturing the sheet metal.

4 0 5 2. If the material is 0 5 in. Bend radii minimum bend sizes.