Sheet Metal Development Length Calculation Excel

Sheet metal round fitting fabrication.

Sheet metal development length calculation excel.

We are going to review three bending scenarios with three different bending angles. 3243 minor chord length. Consider a sheet with a 20 mm thickness and a length of 300 mm as shown in figure 1. Shown is a common dimensioning method and calculation of a setback bend deduction sb setback.

In this article we will discuss sheetmetal bend deduction bend allowance k factor y factor and sheet metal flat pattern calculations. Cells on the right will output the desired values. Dish end calculations as per asme section vii div 1. Procedure is as below.

Punch edge radius in. As this happens you gain a small amount of total length in your part. 60 90 and 120 and we will calculate k factor bend allowance and bend deduction for them. J bown.

3535 major chord length. The amount to be subtracted from the sum of the outside dimensions of the two legs of the bent part. Illustrated here is the development of a blank for parts having a standard 90 deg. Dished head calculation of blank dia.

Die edge radius in. So if you got k factor value now you can easily calculate bending allowance. There are standard charts available with sheet metal design handbook for calculating k factor ideally it should be 0 5. Mathematically k factor value is equal to the ratio of position of neutral axis and sheet thickness.

Ultimate tensile strength psi. K factor in sheet metal bending is a constant used to calculate sheet metal flat length or flat pattern. 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. 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 allowance is 31 08 61 08 90 2 16 mm.

To find α calculate the difference between the unfold length before machining and the outside dimension after machining a b. Overview of pressure vessel design to as 1210 ver 3c. You only have to insert interior angle flange lengths k factor inside radius and material thickness. When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched.

But the most accurate way to find out k factor is reverse engineering of a small but same sheet metal sample piece.