Developed Length Of Bent Sheet Metal

If you have a sheet metal bending product as shown in above picture with two legs of length x and y and you unbend it you will see that total length of the unbend sheet will not x y rather the length will be x y ba.

Developed length of bent sheet metal.

The object is to determine the correct length of the flat blank in preparation for bending. Consider a sheet with a 20 mm thickness and a length of 300 mm as shown in figure 1. These tests include bending some samples and then do some measurements and calculations. Ultimate tensile strength psi.

Calculate the value bend allowance for required sheet metal bend by using below formula. 60 90 and 120 and we will calculate k factor bend allowance and bend deduction for them. For example when sheet metal of length l is bend. Refer to the chart for values for folder as well as various press brake tooling combinations.

You only have to insert interior angle flange lengths k factor inside radius and material thickness. See the snap below. Use the minimum bend dimension values in the charts below for your minimum closeness of cutout to a bend. T the thickness of the sheet or plate 2 000 2 000 i0 125 developing the flat blank length for the above drawn part.

Bend deduction bd the amount removed from the sum of the two flange lengths to obtain a flat pattern. Cells on the right will output the desired values. Dimensions of the two legs of the bent part. Punch edge radius in.

Bending allowance is the input for calculating developed sheet metal size. If the value of sheet metal k factor and bending flange length is known. You can use this sheet metal flat pattern calculator to calculate this increase in length. The formula for this is sb 43r 1 372t r the radius on the inside curve of the bend.

Die edge radius in. Whereas the outer surface is stretched. When sheet metal is bend the inside bending surface is compressed. 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.

Bend allowance ba π 180 r k t a. Sheet metal flat length can be calculated in the following three simple steps. Geometry of tooling imposes a minimum bend dimension. Material thickness mt the gauge of the material in decimal form.

As a result overall sheet length increases. The diagram shows one such mechanism.