Sheet Metal Bend Radius Vs Thickness

The bend deduction is the amount the sheet metal will stretch when bent as measured from the outside edges of the bend.

Sheet metal bend radius vs thickness.

Now multiply that answer by the plate thickness. When sheet metal is bent it stretches in length. The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance. We want to know the final length of the detail.

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. The thickness of the metal. If minimum flange requirement is too close you can choose r t 2 also and suitable die.

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. If the material is 0 5 in. Divide 50 by the material s reduction percentage as specified by the material supplier subtract by 1 and then multiply by the plate thickness. The formed bend radius is dependent upon the dies used the material properties and the material thickness.

The hardness of the metal. First we must start with the k factor. 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. It is possible to choose other bends if you require but additional lead time and tooling charges may apply.

The tables below show bend radii and minimum bend sizes for materials and tooling combinations stocked by protocase. 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. Use this document to choose values that are both manufacturable and meet your needs. Note that this is just a rule of thumb.

So in this case the minimum inside bend radius is 2 times the material thickness. This apply for sheet metal with 2 mm and lesser and obvious tonnage of the machine wi. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. The bending angle is 90 sheet thickness 5 mm and the inside radius is 6 mm.

The material thickness will be measured in decimal form not by the gauge number. For this material this is the minimum producible inside radius with air forming. Bend radii minimum bend sizes. 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.

Generally speaking the thicker a piece of sheet metal is the wider the internal bend radius will have to be. 4 0 5 2. You described a rough rule to find a steel s minimum bend radius.