Bending Force In Sheet Metal

This estimator calculates a force representative of the pressbrake requirement for air bending.

Bending force in sheet metal.

The bending force can be calculated from the sheet thickness die opening bend length and the ultimate tensile strength of the material. The bend radius refers to the inside radius. Bending is one of the most common sheet metal fabrication operations. Bf safetyfactor kfactor ultimatestrength bendlength thickness 2 dieopening bf tons bf 2000 where die opening thickness die ratio kfactor 1 46 0 016 die ratio bf bending force.

The sheet metal is supported by two surfaces a certain distance apart. Also known as press braking flanging die bending folding and edging this method is used to deform a material to an angular shape. Most sheet metal materials will conform to the calculations. Structured sheet metal has increased bending stiffness.

The formed bend radius is dependent upon the dies used the material properties and the material thickness. When sheet metal is bent it stretches in length. The bend deduction is the amount the sheet metal will stretch when bent as measured from the outside edges of the bend. To evaluate this property a three point bending test can be used.

A punch exerts force at the correct spot bending the sheet metal between. As a result a deflection versus bending force curve is obtained as shown infigure 5. The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. This is done through the application of force on a workpiece.

F stretch forming force lbs ys material yield strength psi uts ultimate tensile strength of the material psi a cross sectional area of the workpiece in2 forces needed to bend sheet metal. Air bending is a simple method of creating a bend without the need for lower die geometry. Stress distribution through the thickness of the part. Calculate the required force to bend a piece of sheet metal using v bending a process in which a v shaped punch presses the sheet into a v die.

F ys uts 2 a. This test indicates that a vault structured sheet is three to five times stiffer than nonstructured sheet. Disclaimer actual bending force is affected by many factors such as friction between the material and the die material thickness material strength variations rolling direction of the steel work hardening and other parameters. The free online v bending force calculator.

Open sheet metal bend allowance calculator sheet metal bend allowance equations.