Developed Length Of Bent Sheet Metal

Cells on the right will output the desired values.

Developed length of bent sheet metal.

Bending allowance is the input for calculating developed sheet metal size. Bend angle b the inside angle between the two legs or flanges of a bend. Sheet metal flat length can be calculated in the following three simple steps. Bend allowance ba π 180 r k t a.

The object is to determine the correct length of the flat blank in preparation for bending. When sheet metal is bend the inside bending surface is compressed. Use the minimum bend dimension values in the charts below for your minimum closeness of cutout to a bend. Punch edge radius in.

Consider a sheet with a 20 mm thickness and a length of 300 mm as shown in figure 1. You can use this sheet metal flat pattern calculator to calculate this increase in length. For example when sheet metal of length l is bend. Geometry of tooling imposes a minimum bend dimension.

Calculate the value bend allowance for required sheet metal bend by using below formula. Bend deduction bd the amount removed from the sum of the two flange lengths to obtain a flat pattern. Die edge radius in. Bend allowance ba the amount of added to the sum of the two leg lengths to obtain the flat pattern length.

The diagram shows one such mechanism. These tests include bending some samples and then do some measurements and calculations. If the value of sheet metal k factor and bending flange length is known. Material thickness mt the gauge of the material in decimal form.

Refer to the chart for values for folder as well as various press brake tooling combinations. See the snap below. T the thickness of the sheet or plate 2 000 2 000 i0 125 developing the flat blank length for the above drawn part. You only have to insert interior angle flange lengths k factor inside radius and material thickness.

The formula for this is sb 43r 1 372t r the radius on the inside curve of the bend. Dimensions of the two legs of the bent part. 60 90 and 120 and we will calculate k factor bend allowance and bend deduction for them. Ultimate tensile strength psi.

With this free online tool we quickly get the sheet metal bend deduction and therefore the sheet metal blank initial flat length from the finished part measurements. We are going to review three bending scenarios with three different bending angles.