Bending Sheet Metal Equations

Sheet metal manufacturing and services.

Bending sheet metal equations.

Distance from bend line to mold line. The following illustrations shows the equation calculation for determining the bend allowance when forming sheet metal. To ascertain your k factor inside radius and material thickness expressed as a decimal you should use an bend allowance chart. Still there is one thing to keep in mind.

Bending is a manufacturing process that produces a v shape u shape or channel shape along a straight axis in ductile materials most commonly sheet metal. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. This page also includes a link to a on line sheet metal bend allowance calculator. The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance.

Bend allowance of corner flanges at angles other than 90 deg. Therefore even a simple bench with enough room to bend 3 m pieces will do the job. My workpiece s bending line is 3 m so the overall needed force is 3 22 66 tonnes. Bend angle represents the angle to which sheet metal has bend here it is 90 degree.

The material thickness will be measured in decimal form not by the gauge number. In above bend allowance formula except sheet metal k factor and bend allowance values. Crowning the deflection along a bend. The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal.

Distance from bend. Coining one of the three types of bending for sheet metal where the punch penetrates into the sheet metal under high tonnage forming a consistent bend. R inside bend radius. 0 017453 x 90 x 0 020 0 33 x 0 024 0 0438558984 inch bend allowance.

Where ba is bend allowance. Cross break light bends added to sheet metal in order to stiffen its surface. Ba bend angle π 180 r k factor t eqn 1. Where ossb is the outside setback.

R is inner bend radius. Haco pressmaster press brake machine. Most sheet metal materials will conform to the calculations. Commonly used equipment include box and pan brakes brake presses and other specialized machine presses.

Distance from bend line to mold line. The lowest common bench capacity is around 100 tonnes. Box bending the process of bending a 4 sided sheet metal box. As explained in my first post the bend deduction can be calculated using the following equation.

All other values are known to the user. As an example if you want to bend 24 gauge sheet metal at a 90 angle the calculation would be. Mathematically bend allowance during sheet metal bending can be calculated as. A bending angle.

Bend allowance ba π 180 r k t a. Ossb is defined as illustrated in figure 5 for different bending angles and can be calculated using the equation below. Where a is the bending angle t is the sheet thickness and r is the bending radius.