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Bend deduction bd the amount removed from the sum of the two flange lengths to obtain a flat pattern.
Sheet metal development length formula. The length of the arc for this scenario can be calculated as. Bend allowance ba the amount of added to the sum of the two leg lengths to obtain the flat pattern length. Cells on the right will output the desired values. Ultimate tensile strength psi.
Where ba is bending allowance. Length of the flat blank in preparation for bending. 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. We know that ba is the length of the arc on the neutral axis.
T the thickness of the sheet or plate 2 000 2 000 i0 125 developing the flat blank length for the above drawn part. The formula for this is sb 43r 1 372t r the radius on the inside curve of the bend. Punch edge radius in. Bend deduction is equal to the difference between the total sheet metal length after bending and flat length.
Material thickness mt the gauge of the material in decimal form. Where r is the radius of the arc on the neutral axis. By replacing initial length leg length 1 and 2 in the above equation we can calculate the bend allowance as follows. Sheet metal development calculator is a really simple tool for calculation of development of a sheet metal part.
Die edge radius in. The length of the median plane is the unfold length which can be obtained by the following formula. 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.
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. Therefore after bending total sheetmetal part length a b is greater than sheet metal flat length. Bend angle b the inside angle between the two legs or flanges of a bend.
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