Sheet Metal Development Length Formula

T the thickness of the sheet or plate 2 000 2 000 i0 125 developing the flat blank length for the above drawn part.

Sheet metal development length formula.

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

Bend allowance ba the amount of added to the sum of the two leg lengths to obtain the flat pattern length. 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. Transition patterns available flat pattern segments lobsterback bend elbow ellipsoidal dome head tee offset tee square and rectangle to round frustum cone. You only have to insert interior angle flange lengths k factor inside radius and material thickness.

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. The length of the median plane is the unfold length which can be obtained by the following formula. Bend angle b the inside angle between the two legs or flanges of a bend. We know that ba is the length of the arc on the neutral axis.

Bend deduction bd the amount removed from the sum of the two flange lengths to obtain a flat pattern. 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. Material thickness mt the gauge of the material in decimal form. Length of the flat blank in preparation for bending.

Die edge radius in. Calculate the setback and then subtract it from the sum of two outside dimensions as follows. Bend deduction is equal to the difference between the total sheet metal length after bending and flat length. By replacing initial length leg length 1 and 2 in the above equation we can calculate the bend allowance as follows.

The length of the arc for this scenario can be calculated as. The formula for this is sb 43r 1 372t r the radius on the inside curve of the bend. Cells on the right will output the desired values.