Information
Air Bending Tonnage Chart: Mild Steel How to Read the Pressure Chart If the material thickness and inner radius are known, the following information can be obtained from the chart below: 1. Tonnage required to bend material of 1 metre length 2. V-width to be used 3. Minimum flange length 4 6 7 8 10 12 14 16 18 20 25 32 40 50 63 80 100 125 160 200 250 V 2.8 4 5 5.5 7 8.5 10 11 13.5 14 17.5 22 28 35 45 55 71 89 113 140 175 b 0.7 1 1.1 1.3 1.6 2 2.3 2.6 3 3.3 4 5 6.5 8 10 13 16 20 26 33 41 ir 0.5 4 3 t mm
0.6 6 4 4 4 0.8
7 7 5 4
1
11 10 8 7 6
1.2 1.4 1.6
14 12 10 8 7 6
15 13 11 10 9 8
17 15 13 11 10 9
2
22 19 17 15 13 11
25 23 19 17 15 12
2.3 2.6
28 25 22 18 14
3
34 30 24 19 15
3.2 3.5
34 27 22 17 14
33 26 20 16 13 43 34 27 21 17
F
4
4.5
44 34 27 21
5 6 7 9
52 42 33 26 21
60 48 38 30 24
52 41 33 26
67 54 43
t
Material thickness (tensile strength: 45 - 50 kg/mm 2 )
10 12 16 19 22 25 30
85 67 53 42
96 78 60 55
F ir b V
Tonnage per 1 metre
136 107 86
Inside radius
150 125 100
Minimum flange length
160 130 210 170
V-width
240
Material Thickness and V-Width The distance across the die opening is known as the V-width. The appropriate V-width should be selected in accordance with the thickness of material being bent. The table below shows the optimum relationship between the material thickness and V-width, although in practice this relationship is often determined by specific requirements, including flange lengths (b), the components inner bend radius (ir) and the tonnage capacity of the machine and tooling. Relationship of Material Thickness (t) and V-Width Material Thickness (t) mm 0.5 - 2.5 3.0 - 8.0 9.0 - 10.0 12.0 or more V-Width 6 x t 8 x t 10 x t 12 x t
112
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