Information
Air Bending Tonnage Chart: Stainless 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 6 5 t mm
0.6 9 6 6 6 0.7 12 8 8 6 6 0.8 11 11 8 7 0.9
13 12 10 8 7 17 15 12 11 8
1
1.2 1.5
21 18 15 12 11 9
20 17 15 13 12
2
33 29 26 23 20 17
2.5
39 35 30 25 19
3 4 5 6 8
51 45 36 29 23
F
65 51 41 32 26
78 63 50 39 32
90 72 57 45 36
t
Material thickness (tensile strength: 52 - 60 kg/mm 2 )
102 81 65 51
10 12 15 20 25 30
128 101 80 63
F ir b V
Tonnage per 1 metre
144 117 90 83
Inside radius
180 141 114
Minimum flange length
250 208 167
V-width
315 255
360
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
113
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