Calculations In Sheet Metal Design

When calculating the outside offset use the included bend angle.

Calculations in sheet metal design.

The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. Punch edge radius in. 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.

Bends in the same plane should be designed in the same direction. Since sheet metal cannot be bent to a 90 degree position without breaking at sharp corners all bends will have an acceptable bend radius. For example the density of stainless 300 series is 0 0078 g mm 3. Each type or alloy of metal has a unique density.

Ba bend angle π 180 r k factor t eqn 1. Recommended center distance between holes in sheet metal part. R is inner bend radius. Bends can give strength and shape to a part and are formed in a machine using bend brakes.

Figure 1 50 sheet metal stretching design sheet metal stretch considerations. Where ba is bending allowance. Most sheet metal materials will conform to the calculations. Recommended distance radius of hole1 radius of hole2 sheet thickness.

Inside through the material istm the distance between the outside and inside mold lines. The value of the k factor should range between 0 0 5. Open sheet metal bend allowance calculator sheet metal bend allowance equations. 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.

The formula for calculating sheet metal bending allowance is please refer to the above picture. Bend angle represents the angle to which sheet metal has bend here it is 90 degree. The most common sheet metal form is a bend. You can find the density of your metal or alloy by searching online or looking at a metal reference chart.

This page also includes a link to a on line sheet metal bend allowance calculator. Inside shift iss distance between the outside mold lines and the bend line. Where ba is bend allowance. The ims metal calculator includes density data for each type of metal we sell so you don t need to look it up.

Therefore it is important to have the value correct in cad software. Die edge radius in. 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. 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.