Bend Allowance Table For Sheet Metal

The required die width is 12 mm and tonnage per meter is 22.

Bend allowance table for sheet metal. Therefore even a simple bench with enough room to bend 3 m pieces will do the job. The lowest common bench capacity is around 100 tonnes. Table 1 preferred recommended 90 degree bend radii for various sheet metals. The tables below show bend radii and minimum bend sizes for materials and tooling combinations stocked by protocase.

The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. This page also includes a link to a on line sheet metal bend allowance calculator. My workpiece s bending line is 3 m so the overall needed force is 3 22 66 tonnes. After bending the sheet we need to do some measurements as shown in figure 2.

Sheet metal bend radii if these guidelines are not followed more research and or some form of analysis may be requried. We will start by calculating the bend allowance. Calculate unfold size with bend allowance chart. Bend forming 0 l a b 0 43t t thickness deduction 0 43t.

The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. Understanding the bend deduction and consequently the bend allowance of a part is a crucial first step to understanding how sheet metal parts are fabricated. It is possible to choose other bends but tooling charges may apply.

To use the tables below. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance. Therefore the bend allowance added to the flange lengths is equal to the total flat length.

From there we can calculate the k factor and the bend deduction. Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. Most sheet metal materials will conform to the calculations. L unfold length a outside size b outside size k k factor none 90 bend unfold according to the neutral layer the distance from neutral to sheet inner side is t 3 inner r can refer to the above chart.