Sheet Metal Bending Calculation Pdf

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

Sheet metal bending calculation pdf.

After bending the sheet we need to do some measurements as shown in figure 2. The notation used in the text l w differs from that used in the previous development b l. Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. To find α calculate the difference between the unfold length before machining and the outside dimension after machining a b.

We will start by calculating the bend allowance. As this happens you gain a small amount of total length in your part. 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. The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.

Bending is one of the most common sheet metal fabrication operations. From there we can calculate the k factor and the bend deduction. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. 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.

Cells on the right will output the desired values. This is done through the application of force on a workpiece. Bending force requirement punch workpiece t die w force t sheet thickness w width of die opening l total length of bend into the page uts ultimate tensile strength of material 2 uts w lt f note. 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.

The dimension α is called the bend allowance. You only have to insert interior angle flange lengths k factor inside radius and material thickness. For example if the value of k factor for given material thickness and bending machines is known. The force must exceed the material s yield strength to achieve a plastic deformation.

Commonly used equipment include box and pan brakes brake presses and other specialized machine presses typical products that are made like this are boxes such as electrical enclosures and rectangular ductwork. 90 degrees bend angle. Sheet metal flat length can be calculated using cad softwares. K factor in sheet metal bending is a constant that is used to calculate sheet metal flat length.

For example if the unfold length before bending is 90 mm and if the length of a outside dimension after bending is 31 08 mm and b is 61 08 mm the bend. Material to the inside of this line ought to compress whereas the material on the outside of it should expand. Therefore using k factor there is no need to calculate sheet metal flat length manually.