Sheet Metal Development Length Formula

Bend angle b the inside angle between the two legs or flanges of a bend.

Sheet metal development length formula. Length of the flat blank in preparation for bending. Material thickness mt the gauge of the material in decimal form. The length of the median plane is the unfold length which can be obtained by the following formula. Where r is the radius of the arc on the neutral axis.

The formula for this is sb 43r 1 372t r the radius on the inside curve of the bend. Where ba is bending allowance. Die edge radius in. Transition patterns available flat pattern segments lobsterback bend elbow ellipsoidal dome head tee offset tee square and rectangle to round frustum cone.

By replacing initial length leg length 1 and 2 in the above equation we can calculate the bend allowance as follows. Therefore after bending total sheetmetal part length a b is greater than sheet metal flat length. Bend allowance ba the amount of added to the sum of the two leg lengths to obtain the flat pattern length. Sheet metal development calculator is a really simple tool for calculation of development of a sheet metal part.

Calculate the setback and then subtract it from the sum of two outside dimensions as follows. L a x b x α 360 2π r t1 1 2 here where α 90 the result is l a 1 57 r t1 x 1 2 b. Bend deduction is equal to the difference between the total sheet metal length after bending and flat length. The length of the arc for this scenario can be calculated as.

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. 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. 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.

In this formula the initial length is 300 mm. Ultimate tensile strength psi. Punch edge radius in.