Bending Force In Sheet Metal

Also known as press braking flanging die bending folding and edging this method is used to deform a material to an angular shape.

Bending force in sheet metal. Structured sheet metal has increased bending stiffness. Open sheet metal bend allowance calculator sheet metal bend allowance equations. To evaluate this property a three point bending test can be used. When sheet metal is bent it stretches in length.

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. As a result a deflection versus bending force curve is obtained as shown infigure 5. Most sheet metal materials will conform to the calculations. The bend deduction is the amount the sheet metal will stretch when bent as measured from the outside edges of the bend.

A punch exerts force at the correct spot bending the sheet metal between. This estimator calculates a force representative of the pressbrake requirement for air bending. The sheet metal is supported by two surfaces a certain distance apart. This test indicates that a vault structured sheet is three to five times stiffer than nonstructured sheet.

Stress distribution through the thickness of the part. 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. F ys uts 2 a. The bend radius refers to the inside radius.

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. To define the bend region and reduce the force required to bend a part out of sheet metal down to something you can handle without a brake press slots can be cut at the bending line to selectively. The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. The free online v bending force calculator.

This page also includes a link to a on line sheet metal bend allowance calculator. The die ratio may be entered to calculate the die opening which is typically 6 to 18 times the sheet thickness. The formed bend radius is dependent upon the dies used the material properties and the material thickness. The bending force can be calculated from the sheet thickness die opening bend length and the ultimate tensile strength of the material.

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.