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.

Bend deduction is equal to the difference between the total sheet metal length after bending and flat length. T the thickness of the sheet or plate 2 000 2 000 i0 125 developing the flat blank length for the above drawn part. 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.

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. Where r is the radius of the arc on the neutral axis. You only have to insert interior angle flange lengths k factor inside radius and material thickness.

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. 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. Length of the flat blank in preparation for bending.

Sheet metal development calculator is a really simple tool for calculation of development of a sheet metal part. In this formula the initial length is 300 mm. Punch edge radius in. The formula for this is sb 43r 1 372t r the radius on the inside curve of the bend.

We know that ba is the length of the arc on the neutral axis. The length of the arc for this scenario can be calculated as. Cells on the right will output the desired values. By replacing initial length leg length 1 and 2 in the above equation we can calculate the bend allowance as follows.

Bend allowance ba the amount of added to the sum of the two leg lengths to obtain the flat pattern length. Bend deduction bd the amount removed from the sum of the two flange lengths to obtain a flat pattern. Ultimate tensile strength psi.