Calculations In Sheet Metal Design

Inside offset isos distance between the inside mold lines and the bend line.

Calculations in sheet metal design.

Bend angle represents the angle to which sheet metal has bend here it is 90 degree. Inside shift iss distance between the outside mold lines and the bend line. Ba bend angle π 180 r k factor t eqn 1. Open sheet metal bend allowance calculator sheet metal bend allowance equations.

Where ba is bending allowance. The ims metal calculator includes density data for each type of metal we sell so you don t need to look it up. Bends can give strength and shape to a part and are formed in a machine using bend brakes. Importance of the k factor in sheet metal design the k factor is used to calculate flat patterns because it is related to how much material is stretched during bending.

Die edge radius in. You can find the density of your metal or alloy by searching online or looking at a metal reference chart. Figure 1 50 sheet metal stretching design sheet metal stretch considerations. For example the density of stainless 300 series is 0 0078 g mm 3.

In order to make the stretching smoother generally take r1 3 5 t the maximum fillet radius it should be less than 8 times the thickness of the plate ie r1 8t. Where ba is bend allowance. Each type or alloy of metal has a unique density. Punch edge radius in.

Recommended distance radius of hole1 radius of hole2 sheet thickness. Therefore it is important to have the value correct in cad software. Inside through the material istm the distance between the outside and inside mold lines. Bends in the same plane should be designed in the same direction.

Ultimate tensile strength psi. Recommended minimum distance between two hole centers in sheet metal design should be equal to sum of hole radius plus two times the sheet thickness. The most common sheet metal form is a bend. R is inner bend radius.

The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. The value of the k factor should range between 0 0 5. The formula for calculating sheet metal bending allowance is please refer to the above picture. Recommended center distance between holes in sheet metal part.

This page also includes a link to a on line sheet metal bend allowance calculator. The minimum fillet radius between the bottom and the wall of the tensile member should be greater than the thickness of the plate ie r1 t. Since sheet metal cannot be bent to a 90 degree position without breaking at sharp corners all bends will have an acceptable bend radius. Most sheet metal materials will conform to the calculations.