Allowance For Bending Sheet Metal Equations

Distance from bend line to mold line.

Allowance for bending sheet metal equations. Mathematically bend allowance during sheet metal bending can be calculated as. The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend. In above bend allowance formula except sheet metal k factor and bend allowance values. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length.

90 degrees bend angle. Crowning the deflection along a bend. Therefore even a simple bench with enough room to bend 3 m pieces will do the job. The following illustrations shows the equation calculation for determining the bend allowance when forming sheet metal.

K value of k factor. Space is left between the sheet and the bottom of the v opening. Distance from bend line to mold line calculator. The material thickness will be measured in decimal form not by the gauge number.

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. Bend allowance of corner flanges at angles other than 90 deg. R inside bend radius. Most sheet metal materials will conform to the calculations.

The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. The lowest common bench capacity is around 100 tonnes. 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.

Cross break light bends added to sheet metal in order to stiffen its surface. 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. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. My workpiece s bending line is 3 m so the overall needed force is 3 22 66 tonnes.

Box bending the process of bending a 4 sided sheet metal box. We will start by calculating the bend allowance. Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. Bend allowance ba π 180 r k t a.

All other values are known to the user. A bending angle. T sheet thickness. Distance from bend line to mold line.

This page also includes a link to a on line sheet metal bend allowance calculator.