Sheet Metal Bending Calculation Pdf

To find α calculate the difference between the unfold length before machining and the outside dimension after machining a b.

Sheet metal bending calculation pdf.

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. Sheet metal flat length can be calculated using cad softwares. This is done through the application of force on a workpiece. 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 one of the most common sheet metal fabrication operations. We will start by calculating the bend allowance. 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. 90 degrees bend angle.

Cells on the right will output the desired values. 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. 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. Also known as press braking flanging die bending folding and edging this method is used to deform a material to an angular shape.

After bending the sheet we need to do some measurements as shown in figure 2. 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. As this happens you gain a small amount of total length in your part.

Therefore using k factor there is no need to calculate sheet metal flat length manually. 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. Therefore the bend allowance added to the flange lengths is equal to the total flat. When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched.

Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. You only have to insert interior angle flange lengths k factor inside radius and material thickness. The notation used in the text l w differs from that used in the previous development b l. From there we can calculate the k factor and the bend deduction.

K factor in sheet metal bending is a constant that is used to calculate sheet metal flat length. The dimension α is called the bend allowance. 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.