Press Brake
Bend Allowance - 90º
Example 1 - Bending 1mm mild steel in a 6mm ‘V’ die If (f) = Elongation factor If (d) = Blank development size
20.0
d = (20 + 40) - 2f d = 60 - (2 x 0.87) d = 58.26 mm
1.0
40.0
The following tables show the elongation factor (f) of mild steel, stainless steel and aluminium during a 90° bend.
V = V - width (mm) t = material thickness (mm) f = bend allowances (mm)
Mild Steel
V
4
6
7
8
10
12
14
16
18
20
25
32
t
0.5 0.6 0.7 0.8 1.0 1.2 1.5 1.6 2.0 2.3 2.5 2.6 3.0 3.2
0.47 0.55 0.59 0.63 0.70
0.54 0.62 0.65 0.69 0.77 0.85 0.60 0.68 0.72 0.76 0.83 0.91 0.99 0.67 0.74 0.78 0.82 0.90 0.97 1.05 1.13
0.80 0.87 0.91 0.95 1.03 1.10 1.18 1.26 1.33 1.41 1.00 1.04 1.08 1.15 1.23 1.31 1.38 1.46 1.54
1.19 1.23 1.27 1.35 1.42 1.50 1.58 1.65 1.73 1.92
1.29 1.32 1.40 1.47 1.76 1.86 1.96 2.05 2.29 2.63 1.59 1.67 1.74 1.82 1.90 1.97 2.05 2.24 2.51 1.65 1.71 1.77 1.84 1.90 1.97 2.03 2.19 2.41 1.99 2.07 2.14 2.22 2.29 2.37 2.56 2.83
2.13 2.21 2.28 2.30 2.44 2.63 2.90 2.39 2.46 2.54 2.62 2.69 2.88 3.15 2.51 2.59 2.67 2.74 2.82 3.01 3.28
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