Bending Calculation Formula For Sheet Metal

Bend line shift bls the distance from the outside mold line to the original bend line on the flat pattern this is used to calculate the backstop location when working off of a flat pattern.

Bending calculation formula for sheet metal.

Sheet metal calculator bend allowance equations and calculator. When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched. There are standard charts available with sheet metal design handbook for calculating k factor ideally it should be 0 5. In sheet metal design the k factor is used to calculate how much sheet metal one needs to leave for the bend in order to achieve particular final dimensions especially for between the straight sides next the bend.

Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. From there we can calculate the k factor and the bend deduction. Cross break light bends added to sheet metal in order to stiffen its surface. Cells on the right will output the desired values.

The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. The white dashed line on the part shown above represents the neutral axis which is the theoretical point in the material that does not change during the course of forming. Use the known k factor and the known inner bending radius to calculate the bending radius of the neutral line. Material to the inside of this line ought to compress whereas the material on the outside of it should expand.

We will start by calculating the bend allowance. You only have to insert interior angle flange lengths k factor inside radius and material thickness. Most sheet metal materials will conform to the calculations. The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.

But the most accurate way to find out k factor is reverse engineering of a small but same sheet metal sample piece. Get to know them better to learn advance concept easily. Crowning the deflection along a 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.

Understanding the bend allowance and consequently the bend deduction of a part is a crucial first step to understanding how sheet metal parts are fabricated. So if you got k factor value now you can easily calculate bending allowance. The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. As this happens you gain a small amount of total length in your part.

Box bending the process of bending a 4 sided sheet metal box. After bending the sheet we need to do some measurements as shown in figure 2. With this free online tool we quickly get the sheet metal bend deduction and therefore the sheet metal blank initial flat length from the finished part measurements. Procedure is as below.

Here end the fabrication formulas for sheet metal up next we ll be seeing some of the terminologies in sheet metal that you ll need.