Enter material, thickness, tooling and the part flanges to get the blank length to cut, the radius the bend will form, the force required and whether your press brake can handle it.
Pre-sizing and estimating tool: results do not replace design, calculations or reports signed by a licensed professional, nor verification against the applicable codes and standards.
Effective radius, K-factor, bend allowance (BA), outside setback (OSSB) and bend deduction (BD = 2 · OSSB − BA).
Total force for the bend length, from V = 6t to 12t, and the natural inside radius each opening forms.
Sensitivity of the flat length to the K-factor used, with the same radius and bends.
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It is the location of the neutral line inside the thickness at the bend, as a fraction of thickness. It sets how much material the bend "uses": in the default example (1/8 in sheet, 0.16 in radius, K = 0.43), each 90° bend has a bend allowance of about 0.34 in and a bend deduction of about 0.23 in against outside dimensions.
A 2 × 4 × 2 in outside U channel in 1/8 in steel comes from a strip of about 7.53 in, not 8 in. With a 6 ft bend and a 1 in V die, each foot needs about 7.7 US tons and the total is about 46 US tons; with 20% margin, the suggested stock press brake is 60 tons.
The usual rule is V ≈ 8 times thickness (1 in for 1/8 in sheet); thin sheet uses 6 to 8t and plate over 3/8 in, 10 to 12t. In air bending the inside radius comes out at about 16% of V for steel, 21% for 304 stainless and 10% for 5052-H32 aluminum, unless the punch radius is larger.
From the mill test report or the material spec: A36 steel is 58 to 80 ksi, annealed 304 stainless about 87 ksi and 5052-H32 aluminum about 33 ksi. Use the top of the range to size the press brake safely.
No. The angle entered is what the part must end up with; springback depends on material and radius and is compensated by overbending, set at the brake control. Stainless and high-strength steels spring back more than mild steel.
Mixing outside and inside dimensions, using the punch radius when the die sets the radius, and forgetting that the shortest flange must rest on both sides of the V (about 0.77 × V, or 0.77 in for a 1 in die). Bending parallel to the rolling direction raises the risk of cracking.
Whenever force exceeds 80% of capacity, the part is short and loads the middle of the bed, or the material is high strength. Bend a test piece to measure the real K and check the concentrated-load limit in the manual.
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