Allowance For Bending Sheet Metal Equations

The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.

Allowance for bending sheet metal equations.

The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. The required die width is 12 mm and tonnage per meter is 22. Mathematically bend allowance during sheet metal bending can be calculated as. The material thickness will be measured in decimal form not by the gauge number.

From there we can calculate the k factor and the bend deduction. The following illustrations shows the equation calculation for determining the bend allowance when forming sheet metal. We will start by calculating the bend allowance. Box bending the process of bending a 4 sided sheet metal box.

The optimum width of the v opening is 6 t t stands for material thickness for sheets about 3 mm thick up to about 12 t for 12 mm thick sheets. Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. Bend allowance ba π 180 r k t a. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length.

Crowning the deflection along a bend. Distance from bend line to mold line. All other values are known to the user. R inside bend radius.

Therefore even a simple bench with enough room to bend 3 m pieces will do the job. Distance from bend line to mold line. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. A bending angle.

The bending radius must be at least 0 8 t to 2 t for sheet steel. After bending the sheet we need to do some measurements as shown in figure 2. K value of k factor. This page also includes a link to a on line sheet metal bend allowance calculator.

Bend allowance of corner flanges at angles other than 90 deg. The lowest common bench capacity is around 100 tonnes. 90 degrees bend angle. Space is left between the sheet and the bottom of the v opening.

Coining one of the three types of bending for sheet metal where the punch penetrates into the sheet metal under high tonnage forming a consistent bend. Most sheet metal materials will conform to the calculations. Distance from bend line to mold line calculator. The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance.

My workpiece s bending line is 3 m so the overall needed force is 3 22 66 tonnes.