Sheet Metal Bending Calculation Pdf

The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.

Sheet metal bending calculation pdf.

When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched. Cells on the right will output the desired values. 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. Sheet metal flat length can be calculated using cad softwares.

For example if the value of k factor for given material thickness and bending machines is known. 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. K factor in sheet metal bending is a constant that is used to calculate sheet metal flat length. 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.

Also known as press braking flanging die bending folding and edging this method is used to deform a material to an angular shape. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. From there we can calculate the k factor and the bend deduction. Therefore the bend allowance added to the flange lengths is equal to the total flat.

The notation used in the text l w differs from that used in the previous development b l. You only have to insert interior angle flange lengths k factor inside radius and material thickness. Bending is one of the most common sheet metal fabrication operations. Therefore using k factor there is no need to calculate sheet metal flat length manually.

Material to the inside of this line ought to compress whereas the material on the outside of it should expand. 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. As this happens you gain a small amount of total length in your part. After bending the sheet we need to do some measurements as shown in figure 2.

The dimension α is called the bend allowance. 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. We will start by calculating the bend allowance. The force must exceed the material s yield strength to achieve a plastic deformation.

90 degrees bend angle. This is done through the application of force on a workpiece. 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.