Calculating Flat Pattern Length Sheet Metal

Sheet metal bending is a forming operation.

Calculating flat pattern length sheet metal. To develop the blank flat length for a cylinder rolled from sheet or plate is quite simple. Outside diameter thickness x 3 1416 length of plate required inside diameter thickness x 3. When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched. Foil very thin sheet metal made from typically malleable metals such as aluminum and gold.

Cells on the right will output the desired values. As this happens you gain a small amount of total length in your part. Should be subtracted from the flat pattern so the formed part arrives at the desired dimensions. Therefore the bend allowance added to the flange lengths is equal to the total flat.

Outside diameter thickness x 3 1416 length of plate required inside diameter thickness x 3 1416 length of plate required. Because a bend deduction can be measured in a physical part it is the most accurate way to calculate a material s stretch. In the example above it is indicated by a dashed blue line. Essentially you should calculate the centerline arc.

Where sheets are deformed plastically to change its shape. The bend allowance is the amount of the neutral axis that bends. As a result overall sheet length increases. Whereas the outer surface is stretched.

You can use this sheet metal flat pattern calculator to calculate this increase in length. When sheet metal is bend the inside bending surface is compressed. Flange length the length of the workpiece when measured from the apex to the edge of the bend. During bending material is stressed beyond its yield strength but below the ultimate tensile strength after bending the total length of sheet metal is more than flat length.

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. You only have to insert interior angle flange lengths k factor inside radius and material thickness. 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 bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.

Likewise when you are trying to develop a flat pattern you will have to make a deduction from your desired part size to get the correct flat size. Essentially you should calculate the centerline arc. To develop the blank flat length for a cylinder rolled from sheet or plate is quite simple.